CN110350574B - Emergency power control method and system for offshore wind power through soft direct access system - Google Patents
Emergency power control method and system for offshore wind power through soft direct access systemInfo
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- CN110350574B CN110350574B CN201910467290.3A CN201910467290A CN110350574B CN 110350574 B CN110350574 B CN 110350574B CN 201910467290 A CN201910467290 A CN 201910467290A CN 110350574 B CN110350574 B CN 110350574B
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- offshore wind
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Wind Motors (AREA)
Abstract
本发明提供了一种海上风电经柔直接入系统的紧急功率控制方法和系统，包括：基于预先建立的通讯系统，接收系统调度中心发送的控制信号；根据控制信号的类型，启动对应的紧急功率控制方法；其中，紧急功率控制方法可作用于陆上制动电阻器和/或海上风电场交流系统；陆上制动电阻器设置于陆上换流站直流出口处。本发明利用柔性直流有功功率可快速独立调节的特点，设计出具备紧急功率控制方法，可有效调节注入主网系统的功率，提高了对海上风电控制的灵活性。
The present invention provides an emergency power control method and system for an offshore wind power system connected via flexible direct current (FDC), comprising: receiving a control signal from a system dispatching center based on a pre-established communication system; initiating a corresponding emergency power control method based on the type of control signal; wherein the emergency power control method can act on an onshore braking resistor and/or an offshore wind farm AC system; and wherein the onshore braking resistor is disposed at the DC outlet of an onshore converter station. By utilizing the rapid and independent adjustment of flexible DC active power, the present invention designs an emergency power control method that can effectively adjust the power injected into the main grid system, thereby increasing the flexibility of offshore wind power control.
Description
Technical Field
The invention belongs to the technical field of control of flexible direct current transmission systems, and particularly relates to an emergency power control method and system for a system for directly inputting offshore wind power through flexibility.
Background
Compared with land wind power, the offshore wind power resource is richer, the influence of the geographic natural environment is smaller, and the wind energy sustainability is better, so that the offshore wind power has become one of the main trends of green sustainable energy development, and the engineering stage is entered at present.
In the prior art, the transmission of electric energy generated by offshore wind power to a main network through a flexible direct current transmission (HVDC) system becomes a main means, but wind power generation has the characteristics of volatility, intermittence and randomness, and high requirements are put on a control system. When the wind power generation power is low, power can be supplied by scheduling other generator sets of the main network. When the wind power generation power is higher, redundant power needs to be dissipated, otherwise, direct current overvoltage or follow current to the ground fault of the main network is easily caused under the condition of the fault of the main network, if the wind power generation power is only dependent on the power reduction control of the fan, the response time is longer, and the short-time power reduction requirement cannot be met. At this time, it is generally selected to provide a braking resistor for the corresponding function.
Typically, the braking resistor may be automatically engaged in achieving power dissipation by detecting an offset that reflects the amount of power imbalance. However, when a major fault or other emergency occurs in the main network, the power injected by the offshore wind power is required to be reduced to zero or a certain power level on a millisecond time scale, and the input power of the wind power plant is considered to be unchanged on a hundred millisecond time scale, so that a corresponding emergency power control strategy and method are lacking currently, and rapid power adjustment cannot be realized.
Disclosure of Invention
In order to overcome the defect that the power injected into the main network cannot be accurately, quickly and effectively controlled under the condition that the main network has serious faults or other scheduling demands aiming at the offshore wind power system accessed into the main network through the flexible direct current transmission system in the prior art, the invention provides an emergency power control method and system for the offshore wind power through the flexible direct current access system, which are combined with the power dissipation capacity of a braking resistor at the direct current outlet of a land convertor station, can realize the accurate, quick and effective adjustment of the active power injected into the main network, and improve the flexibility of wind power adjustment.
The solution adopted for achieving the purpose is as follows:
In a method for emergency power control of offshore wind power via soft direct entry system, the improvement comprising:
Based on a pre-established communication system, receiving a control signal sent by a system dispatching center;
Starting a corresponding emergency power control method according to the type of the control signal;
the emergency power control method can be applied to a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station.
The first preferred technical scheme provided by the invention is improved in that the starting of the corresponding emergency power control method according to the type of the control signal comprises the following steps:
The control signals comprise a first control signal set when the main network has a ground fault, a second control signal set when the active power of the wind power injection main network is required to be reduced, and a third control signal set when the active power of the wind power injection main network is recovered;
When the control signal is a first control signal, the land brake resistor is controlled to start a power dissipation function, so that the active power injected into the main network is rapidly reduced to 0;
When the control signal is a second control signal, starting a long-term power reduction function, and continuously reducing the active power injected into the main network by starting a self power dissipation function of the offshore wind farm control system or a common power dissipation function of the offshore wind farm control system matched with a land brake resistor;
And when the control signal is a third control signal, inhibiting a long-term power reduction function, and recovering active power injected into the main network by inhibiting a power dissipation function of the offshore wind farm control system or a power dissipation function of the offshore wind farm control system and a land brake resistor.
The second preferred technical scheme provided by the invention is improved in that the method for realizing the rapid drop of active power injected into a main network to 0 by controlling the land brake resistor to start a power dissipation function comprises the following steps:
The land brake resistor is controlled to consume active power transmitted by the direct current system in millisecond time by zeroing the parameters of an inner ring controller of the land convertor station control system, and the active power injected into the main network is reduced to 0.
The third preferred technical scheme provided by the invention is improved in that after the active power injected into the main network is reduced to 0, the method further comprises the following steps:
and after the preset time duration is continued, recovering the active power injected into the main network to the power generation level of the offshore wind turbine.
The fourth preferred technical scheme provided by the invention is improved in that the recovery of active power injected into a main network to the power generation level of an offshore wind turbine generator set comprises the following steps:
And (3) recovering active power injected into the main network to the power generation level of the offshore wind turbine by adjusting the input quantity of the resistors according to the required power recovery speed.
The fifth preferred technical solution provided by the present invention is improved in that the starting of the long-term power reduction function, by starting the self power dissipation function of the offshore wind farm control system or the common power dissipation function of the offshore wind farm control system and the land brake resistor, realizes the continuous reduction of the active power injected into the main network, and includes:
When the emergency situation is not met, the second control signal is transmitted to an offshore wind farm alternating current system, so that the offshore wind farm control system starts a self power dissipation function, and active power injected into a main network is reduced and kept;
When an emergency situation occurs, the second control signal is transmitted to an offshore wind farm alternating current system, so that the offshore wind farm control system starts a self power dissipation function, active power injected into a main network is reduced, and meanwhile, the power injected into the main network is quickly reduced to a set level and continuously reduced by starting an onshore brake resistor power dissipation function;
Wherein, land braking resistor adjusts the quantity of resistor that drops into according to fan power reduction.
The sixth preferred technical solution provided by the present invention is improved in that the inhibiting the long-term power-down function, by inhibiting the power dissipation function of the offshore wind farm control system itself or the power dissipation function of the offshore wind farm control system itself and the land brake resistor, realizes the recovery of the active power injected into the main network, and includes:
When only the self power dissipation function of the offshore wind farm control system is started, transmitting the third control signal to an offshore wind farm alternating current system, enabling the offshore wind farm control system to stop the self power dissipation function, and recovering active power injected into the main network to the power generation level of the offshore wind turbine;
When the offshore wind farm control system and the land brake resistor power dissipation function are started at the same time, the third control signal is transmitted to the offshore wind farm alternating current system, so that the offshore wind farm control system stops the power dissipation function, and meanwhile, the land brake resistor is stopped according to the third control signal to operate, and active power injected into the main network is recovered to the power generation level of the offshore wind turbine.
In an emergency power control system of a soft direct-in system of offshore wind power, the improvement comprises a signal module and a control module;
the signal module is used for receiving a control signal sent by a system dispatching center based on a pre-established communication system;
the control module is used for starting a corresponding emergency power control method according to the type of the control signal;
the emergency power control method can be applied to a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station.
The seventh preferred technical scheme provided by the invention is improved in that the control module comprises a first control unit, a second control unit and a third control unit;
The control signals comprise a first control signal set when the main network has a ground fault, a second control signal set when the active power of the wind power injection main network is required to be reduced, and a third control signal set when the active power of the wind power injection main network is recovered;
the first control unit is used for controlling the land brake resistor to start a power dissipation function when the control signal is a first control signal, so that the active power injected into the main network is rapidly reduced to 0;
The second control unit is used for starting a long-term power reduction function when the control signal is a second control signal, and continuously reducing the active power injected into the main network by starting the self power dissipation function of the offshore wind farm control system or the common power dissipation function of the offshore wind farm control system matched with the land brake resistor;
and the third control unit is used for inhibiting the long-term power reduction function when the control signal is a third control signal, and recovering the active power injected into the main network by inhibiting the power dissipation function of the offshore wind farm control system or the power dissipation function of the offshore wind farm control system and the land brake resistor.
The eighth preferred technical scheme provided by the invention is characterized in that the second control unit comprises an emergency control subunit and a non-emergency control subunit;
The emergency control subunit is used for transmitting the second control signal to the offshore wind farm alternating current system when no emergency exists, so that the offshore wind farm control system starts a self power dissipation function, and reduces and continues the active power injected into the main network;
the non-emergency control subunit is used for transmitting the second control signal to the offshore wind farm alternating current system when an emergency occurs, so that the offshore wind farm control system starts a self power dissipation function, reduces the active power injected into the main network, and simultaneously quickly reduces the power injected into the main network to a set level and continuously through starting the onshore brake resistor power dissipation function;
Wherein, land braking resistor adjusts the quantity of resistor that drops into according to fan power reduction.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides an emergency power control method and an emergency power control system suitable for an offshore wind power direct-entering system through flexibility, which are based on a pre-established communication system, receive control signals sent by a system dispatching center, and start a corresponding emergency power control method according to the type of the control signals, wherein the emergency power control method can act on a land brake resistor and/or an offshore wind farm alternating-current system, and the land brake resistor is arranged at a direct-current outlet of a land convertor station. The invention designs the emergency power control method by utilizing the characteristic that the flexible direct current active power can be quickly and independently regulated, can effectively regulate the power injected into the main network system, and improves the flexibility of offshore wind power control.
The method specifically comprises the following steps:
1. when the main network has a ground fault, the EPC1 function can be started, so that the power injected into the main network is quickly reduced to zero, the fault current fed in by the ground point is reduced, the over-high lifting of the direct current voltage is avoided, the buffer time is provided for the recovery of the fault point by maintaining a short-time zero power state, and finally the current wind turbine generator system power generation level is gradually recovered, so that the reliable elimination of the fault and the stable recovery of the system are ensured.
2. When the main network dispatching center balances regional power grid load and requires to reduce the power of wind power injected into the main network, the EPC2 function can be started, so that the power injected into the main network is reduced to a certain level, and the flexibility of power adjustment is improved.
3. When the regional power grid load is balanced by the main network dispatching center and the power of the wind power injection main network is required to be improved, the EPC3 signal is started to disable the EPC2 function, so that the power of the wind power injection main network is recovered to the current power generation level, and the power support can be effectively provided in time.
Drawings
FIG. 1 is a schematic flow chart of an emergency power control method for a soft direct-entry system of offshore wind power provided by the invention;
FIG. 2 is a schematic diagram of an emergency power control function provided by the present invention;
FIG. 3 is a schematic diagram of an EPC1 function control strategy for emergency power control according to the present invention;
FIG. 4 is a schematic diagram of an overall architecture of an emergency power control method according to the present invention;
FIG. 5 is a schematic diagram of power transfer after the EPC1 function is started in an embodiment of the present invention;
FIG. 6 is a schematic diagram of power transfer to 25% power drop in a non-emergency situation after EPC2 function is enabled, according to an embodiment of the present invention;
FIG. 7a is a schematic diagram of signal waveforms of EPC2 and brake resistors and power consumed by land brake resistors in an emergency after EPC2 function is enabled, according to an embodiment of the present invention;
Fig. 7b is a schematic diagram of the power injected into the main network by the flexible direct system and the power injected into the flexible direct system by the blower after the EPC2 function is started in the emergency;
FIG. 7c is a schematic diagram of the DC voltage on the land side and the sea side after the EPC2 function is activated, the power is reduced to 25% in an emergency, according to the embodiment of the present invention;
FIG. 8 is a schematic diagram of signal and power transmission after the EPC3 function is activated in an embodiment of the present invention;
FIG. 9 is a schematic diagram of the basic structure of an emergency power control system for offshore wind power through soft direct entry system provided by the invention;
fig. 10 is a detailed structural schematic diagram of an emergency power control system for offshore wind power through soft direct entry system provided by the invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1:
The flow diagram of the emergency power control method for the offshore wind power through the soft direct entry system provided by the invention is shown in fig. 1, and the emergency power control method comprises the following steps:
step 1, receiving a control signal sent by a system dispatching center based on a pre-established communication system;
step 2, starting a corresponding emergency power control method according to the type of the control signal;
The emergency power control method can be applied to a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station.
Specifically, according to the emergency power control method for the offshore wind power directly entering the system through the flexibility, three emergency power control functions and implementation methods thereof are designed according to actual system control requirements, and the emergency power control method is shown in fig. 2. Unlike braking resistors, which automatically achieve power dissipation by monitoring the amount of power imbalance (usually initiated under non-emergency, low power deviation conditions), the control method achieves short-time, high-power, speed-adjustable emergency power control by designing a special control strategy, which is complementary to the automatic power dissipation function, is initiated only after a system dispatching center sends a control signal to a land-based flexible direct current converter station, which requires that a good communication system be established between the system main network and the flexible direct current converter station, and the emergency power control method achieves the 3 functions in fig. 2 according to different signal types.
First, when the land-based converter station control system receives an EPC1 (emergency power control ) signal, i.e. a first control signal, it executes according to the control strategy of fig. 3, where P DC is active power transmitted by the dc system, P r is active power dissipated by the braking resistor, P in is active power injected into the main network, F is a power dissipation signal applied to the braking resistor, Δp is an active power recovery speed, and t represents time. The method comprises the following specific steps:
And 101-1, closing a switch S2 and closing the switch S1 to a contact a, so that the braking resistor dissipates active power transmitted by the direct current system within t 1, at the moment, the active power injected into the main network is ensured to be rapidly reduced to zero, and the high power can be reduced to zero within millisecond time, namely t 1 is millisecond time through setting the parameters of an inner ring controller of the land-based converter station control system to zero.
If the short-time zero power state is to be maintained, the current state is maintained for t 2 time, step 101-2.
And 101-3, changing the state of the switch S1 to the contact b, and adjusting the input quantity of the brake resistor to enable the active power injected into the main network to be restored to the current generation level of the offshore wind turbine according to the slope of delta P, wherein the delta P can be adjusted according to actual requirements. For example, in fig. 2, after time t 3, the active power injected into the main network is restored to the current offshore wind turbine generation level.
And step 101-4, the switches S1 and S2 are opened, and the EPC1 function is completed.
Second, when the land-based converter station control system receives the EPC2 signal, i.e., the second control signal, the long-term power reduction function is started as shown in fig. 4. In the non-emergency case, the signal is transmitted to the offshore wind farm ac system forcing the offshore wind farm control system to activate its own power dissipation function, reducing the power injected into the main network at a relatively slow rate.
In an emergency, the signal will act on both the onshore brake resistor and the offshore wind farm ac system. On the one hand, the power injected into the main network is quickly reduced to the required level by starting the land brake resistor, and on the other hand, the offshore wind farm control system is forced to start a self power dissipation function, so that the generated power of the fan is reduced at a relatively slow speed. Because the speed of the fan power reduction is smaller than the speed of the land brake resistor dissipating the power, the land brake resistor is required to adjust the number of the resistors according to the condition of the fan power reduction so as to ensure that the power injected into the main network is unchanged until the fan power generation power is reduced to the required level.
Third, when the land-based converter station control system receives the EPC3 signal, i.e., the third control signal, the long-term power-down function is suppressed, as shown in fig. 4. The signal will force the offshore wind farm control system to stop reducing power, and if the onshore brake resistor is also put into operation, the signal will also cause it to be out of operation, so that the active power injected into the main network is restored to the power generation level of the offshore wind turbine.
For the 3 emergency power control functions, the priority levels are EPC1> EPC3> EPC2.
Furthermore, the implementation of EPC1 functions depends on the design of the brake resistor, the heat capacity of which should meet the requirements under the most severe conditions, and at the same time require a transient process with cooling regulation after exiting.
The EPC1 signal is set when the main network has a ground fault, the EPC2 signal is set when the active power of the wind power injection main network is required to be reduced, and the EPC3 signal is set when the active power of the wind power injection main network is recovered.
Fig. 5 is a schematic diagram of Power transmission after the EPC1 function is started, including the active Power injected into the main network and the Power consumed by the brake resistor, and the corresponding functions are fully implemented, wherein P, Q is the active Power and the reactive Power injected into the main network, and br_power refers to the Power consumed by the land brake resistor.
Fig. 6 is a schematic diagram of power transmission situation in which power is reduced to 25% in a non-emergency situation after the EPC2 function is started, that is, when only the offshore wind turbine power reduction function is started, the power level required to be injected into the main network is reduced to 25%, and the corresponding function is completely realized.
Fig. 7 a-7 c are schematic diagrams of signals and power transmission conditions for an emergency situation in which power is reduced to 25% after the EPC2 function is started, that is, when the offshore wind turbine power reduction function and the land brake resistor are started simultaneously, the power level required to be injected into the main network is reduced to 25%, and the corresponding function is completely realized. Among other things, fig. 7a shows the signal waveforms of EPC2 and the braking resistor and the power dissipated by the land braking resistor. Fig. 7b shows a schematic diagram of the power injected into the main network by the flexible-direct system and the power injected into the flexible-direct system by the fan, wherein p_gap and q_gap are the active power and the reactive power of the main network injected by the flexible-direct system respectively, and p_wc and q_wc are the active power and the reactive power of the flexible-direct system injected by the fan respectively. Fig. 7c shows a schematic diagram of the dc voltage on the land side and the sea side.
Fig. 8 shows that after the EPC3 function is started, the current EPC2 function is disabled, the power injected into the offshore converter station by the fan and the power injected into the main network by the onshore converter station stop decreasing at the same time, and the power is gradually recovered after a period of time, and the power recovery part is not shown here because of the longer time axis. Wherein P is the active power of the soft and straight system injected into the main network, and P_pcb is the active power of the blower injected into the soft and straight system.
Example 2:
Based on the same conception, the invention also provides an emergency power control system of the offshore wind power soft direct-entry system, and as the principle of solving the technical problems by the equipment is similar to that of the emergency power control method of the offshore wind power soft direct-entry system, repeated parts are not repeated.
The basic structure of the system is shown in fig. 9, and comprises a signal module and a control module;
The signal module is used for receiving a control signal sent by the system scheduling center based on a pre-established communication system;
the control module is used for starting a corresponding emergency power control method according to the type of the control signal;
The emergency power control method can be applied to a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station.
The detailed structure of the emergency power control system of the offshore wind power soft direct-in system is shown in fig. 10.
The control module comprises a first control unit, a second control unit and a third control unit;
The control signals comprise a first control signal set when the main network has a ground fault, a second control signal set when the active power of the wind power injection main network is required to be reduced, and a third control signal set when the active power of the wind power injection main network is recovered;
the first control unit is used for controlling the land brake resistor to start a power dissipation function when the control signal is a first control signal, so that the active power injected into the main network is rapidly reduced to 0;
The second control unit is used for starting a long-term power reduction function when the control signal is a second control signal, and continuously reducing the active power injected into the main network by starting the self power dissipation function of the offshore wind farm control system or the common power dissipation function of the offshore wind farm control system matched with the land brake resistor;
And the third control unit is used for inhibiting the long-term power reduction function when the control signal is the third control signal, and recovering the active power injected into the main network by inhibiting the power dissipation function of the offshore wind farm control system or the power dissipation function of the offshore wind farm control system and the land brake resistor.
The first control unit controls the land brake resistor to consume active power transmitted by the direct current system and reduces the active power injected into the main network to 0 in millisecond-level time through setting the parameters of an inner ring controller of the land convertor station control system to zero.
The first control unit comprises a first recovery subunit, and the first recovery subunit is used for recovering the active power injected into the main network to the power generation level of the offshore wind turbine after the preset time duration.
The first recovery subunit recovers the active power injected into the main network to the power generation level of the offshore wind turbine generator set according to the required power recovery speed by adjusting the input quantity of the resistors.
Wherein the second control unit comprises an emergency control subunit and a non-emergency control subunit;
The emergency control subunit is used for transmitting a second control signal to the offshore wind farm alternating current system when the emergency situation is not met, so that the offshore wind farm control system starts a self power dissipation function, reduces active power injected into the main network and lasts;
The non-emergency control subunit is used for transmitting a second control signal to the offshore wind farm alternating current system when an emergency occurs, so that the offshore wind farm control system starts a self power dissipation function, reduces the active power injected into the main network, and simultaneously quickly reduces the power injected into the main network to a set level and continuously through starting an onshore brake resistor power dissipation function;
Wherein, land braking resistor adjusts the quantity of resistor that drops into according to fan power reduction.
Wherein the third control unit comprises an independent control subunit and a double control subunit;
The independent control subunit is used for transmitting a third control signal to the offshore wind farm alternating current system when only the self power dissipation function of the offshore wind farm control system is started, so that the offshore wind farm control system stops the self power dissipation function and the active power injected into the main network is recovered to the power generation level of the offshore wind turbine;
And the dual control subunit is used for transmitting a third control signal to the offshore wind farm alternating current system when the offshore wind farm control system and the onshore brake resistor power dissipation function are started simultaneously, so that the offshore wind farm control system stops the own power dissipation function, and simultaneously stops the onshore brake resistor according to the third control signal to restore the active power injected into the main network to the power generation level of the offshore wind turbine.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of protection thereof, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the application after reading the present application, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
Claims (8)
1. An emergency power control method for a system for directly entering offshore wind power through flexibility is characterized by comprising the following steps:
Based on a pre-established communication system, receiving a control signal sent by a system dispatching center;
Starting a corresponding emergency power control method according to the type of the control signal;
The emergency power control method can act on a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station;
the method for starting the corresponding emergency power control method according to the type of the control signal comprises the following steps:
The control signals comprise a first control signal set when the main network has a ground fault, a second control signal set when the active power of the wind power injection main network is required to be reduced, and a third control signal set when the active power of the wind power injection main network is recovered;
When the control signal is a first control signal, the land brake resistor is controlled to start a power dissipation function, so that the active power injected into the main network is rapidly reduced to 0;
When the control signal is a second control signal, starting a long-term power reduction function, and continuously reducing the active power injected into the main network by starting a self power dissipation function of the offshore wind farm control system or a common power dissipation function of the offshore wind farm control system matched with a land brake resistor;
And when the control signal is a third control signal, inhibiting a long-term power reduction function, and recovering active power injected into the main network by inhibiting a power dissipation function of the offshore wind farm control system or a power dissipation function of the offshore wind farm control system and a land brake resistor.
2. The method of claim 1, wherein said enabling the active power injected into the main network to drop rapidly to 0 by controlling the land brake resistor to activate the power dissipation function comprises:
The land brake resistor is controlled to consume active power transmitted by the direct current system in millisecond time by zeroing the parameters of an inner ring controller of the land convertor station control system, and the active power injected into the main network is reduced to 0.
3. The method of claim 2, wherein after the active power injected into the main network is reduced to 0, further comprising:
and after the preset time duration is continued, recovering the active power injected into the main network to the power generation level of the offshore wind turbine.
4. A method according to claim 3, wherein recovering active power injected into the main network to the offshore wind turbine generation level comprises:
And (3) recovering active power injected into the main network to the power generation level of the offshore wind turbine by adjusting the input quantity of the resistors according to the required power recovery speed.
5. The method of claim 1, wherein the enabling of the long-term power reduction function by enabling an offshore wind farm control system self power dissipation function or an offshore wind farm control system self co-operating land brake resistor common power dissipation function, comprises:
When the emergency situation is not met, the second control signal is transmitted to an offshore wind farm alternating current system, so that the offshore wind farm control system starts a self power dissipation function, and active power injected into a main network is reduced and kept;
When an emergency situation occurs, the second control signal is transmitted to an offshore wind farm alternating current system, so that the offshore wind farm control system starts a self power dissipation function, active power injected into a main network is reduced, and meanwhile, the power injected into the main network is quickly reduced to a set level and continuously reduced by starting an onshore brake resistor power dissipation function;
Wherein, land braking resistor adjusts the quantity of resistor that drops into according to fan power reduction.
6. The method of claim 1, wherein the suppressing the long term power down function by suppressing an offshore wind farm control system self power dissipation function or an offshore wind farm control system self and land brake resistor power dissipation function, comprises:
When only the self power dissipation function of the offshore wind farm control system is started, transmitting the third control signal to an offshore wind farm alternating current system, enabling the offshore wind farm control system to stop the self power dissipation function, and recovering active power injected into the main network to the power generation level of the offshore wind turbine;
When the offshore wind farm control system and the land brake resistor power dissipation function are started at the same time, the third control signal is transmitted to the offshore wind farm alternating current system, so that the offshore wind farm control system stops the power dissipation function, and meanwhile, the land brake resistor is stopped according to the third control signal to operate, and active power injected into the main network is recovered to the power generation level of the offshore wind turbine.
7. The emergency power control system for the offshore wind power through soft direct entry system is characterized by comprising a signal module and a control module;
the signal module is used for receiving a control signal sent by a system dispatching center based on a pre-established communication system;
the control module is used for starting a corresponding emergency power control method according to the type of the control signal;
The emergency power control method can act on a land brake resistor and/or an offshore wind farm alternating current system, wherein the land brake resistor is arranged at a direct current outlet of a land converter station;
the control module comprises a first control unit, a second control unit and a third control unit;
The control signals comprise a first control signal set when the main network has a ground fault, a second control signal set when the active power of the wind power injection main network is required to be reduced, and a third control signal set when the active power of the wind power injection main network is recovered;
the first control unit is used for controlling the land brake resistor to start a power dissipation function when the control signal is a first control signal, so that the active power injected into the main network is rapidly reduced to 0;
The second control unit is used for starting a long-term power reduction function when the control signal is a second control signal, and continuously reducing the active power injected into the main network by starting the self power dissipation function of the offshore wind farm control system or the common power dissipation function of the offshore wind farm control system matched with the land brake resistor;
and the third control unit is used for inhibiting the long-term power reduction function when the control signal is a third control signal, and recovering the active power injected into the main network by inhibiting the power dissipation function of the offshore wind farm control system or the power dissipation function of the offshore wind farm control system and the land brake resistor.
8. The system of claim 7, wherein the second control unit comprises an emergency control subunit and a non-emergency control subunit;
The emergency control subunit is used for transmitting the second control signal to the offshore wind farm alternating current system when no emergency exists, so that the offshore wind farm control system starts a self power dissipation function, and reduces and continues the active power injected into the main network;
the non-emergency control subunit is used for transmitting the second control signal to the offshore wind farm alternating current system when an emergency occurs, so that the offshore wind farm control system starts a self power dissipation function, reduces the active power injected into the main network, and simultaneously quickly reduces the power injected into the main network to a set level and continuously through starting the onshore brake resistor power dissipation function;
Wherein, land braking resistor adjusts the quantity of resistor that drops into according to fan power reduction.
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