CN103441529A - Variable-speed wind turbine generator inertia response simulating control method - Google Patents

Abstract

The invention discloses a variable-speed wind turbine generator inertia response simulating control method. The method comprises the steps that according to the wind turbine generator hub wind speed vw and the wind turbine generator rotating speed omega r, the active-power control reference value P0 of a wind turbine generator is set based on a maximum wind energy power tracking control strategy; extra controls are added through power grid frequency values on the basis of maximum wind energy power tracking control, according to operation conditions of the wind turbine generator, short-time constant-power supporting is carried out through table searching or online adjusting to achieve inertia response simulation, and meanwhile the wind turbine generator active power recovery process is achieved according to a certain power curve. The variable-speed wind turbine generator inertia response simulating control method can overcome the problems that the rotational inertia of a wind turbine generator is not sufficiently utilized, the wind turbine generator is out of a reasonable operation range, inertia control is lack of flexibility, response time is long, particularly, the rotating speed of the wind turbine generator is too low, and the torque and the rotator current of the wind turbine generator are too large in the prior art. The variable-speed wind turbine generator inertia response simulating control method can effectively reduce the frequency deviation amplitude and the rate of change after large frequency disturbance accidents, and improves frequency stability of an electric power system.

Description

A control method for simulated inertia response of variable speed wind turbines

technical field

The invention relates to the technical field of wind power generation, in particular to a control method for simulated inertia response of variable-speed wind turbines.

Background technique

Wind power generation is a clean and renewable new energy generation method, which is of great significance for protecting the environment and saving fossil energy. However, wind power generation is an "unfriendly" power generation technology for the power system due to its volatility, uncertainty and weak support ability of wind turbines to the grid. Power grid companies and dispatching agencies need wind turbines to respond to grid frequency disturbances and maintain grid frequency stability through power converters and other control devices when wind turbines are disturbed. Especially when the frequency of the power grid decreases, it can realize simulated inertia response and transient active power support.

Traditional variable-speed wind turbines using control strategies such as maximum wind energy power tracking can effectively track changes in wind speed due to the fast response characteristics of power electronic devices, but cannot respond to changes in grid frequency and active power unless the original control The strategy is modified.

PCT Application No. WO2011/008637 entitled "Relay Controller and Control Method for Variable Speed Wind Turbines During Abnormal Frequency Conditions" filed on July 9, 2010 One method is described in the EN patent. This method configures the variable-speed wind turbine to provide a fixed supplementary power increment within the allowable capacity of the actual wind turbine when the grid frequency drops below the threshold, until the grid frequency returns to an appropriate predetermined value, and there is no need to evaluate the grid frequency deviation. Any of the rate of change, the integral of the deviation, and/or the magnitude of the deviation. This method does not consider the impact of the power captured by the wind turbine on the control of the wind turbine when the speed of the wind turbine decreases; it does not give a reasonable design for the inertia response and transient power support capability of the wind turbine under different operating conditions. Set control parameters.

Literature (Germán Claudio Tarnowski, Philip Carne Kjær, Poul E. Sørensen. Variable Speed Wind Turbines Capability for Temporary Over-Production [C]. IEEE Power & Energy Society General Meeting, 2009 (PES '09), 1-7) proposed a simulated inertia response control method, which considered the influence of wind turbine speed reduction on the captured wind energy mechanical power, and adopted constant power control during the speed recovery process The method can effectively realize the simulated inertia response control of the wind turbine and make full use of the rotor kinetic energy of the wind turbine. However, this method does not consider the limitation of wind turbine torque, and the recovery process uses constant power control, which leads to a long recovery time. This method also does not provide a method for how to reasonably set control parameters for wind turbine combinations under different operating conditions.

In the process of realizing the present invention, the inventors found that in the prior art, there are at least insufficient utilization of the wind turbine inertia response capability, difficulty in controlling physical quantities such as torque and current within a reasonable range, insufficient optimization of the frequency stability support characteristics of the power system, Poor flexibility, long response time and other defects.

Contents of the invention

The object of the present invention is to solve the above problems and propose a variable-speed wind turbine simulation inertia response control method to reduce the frequency deviation amplitude and change rate after a large frequency disturbance event occurs in the power grid, and improve the frequency stability of the power system.

In order to achieve the above object, the technical solution adopted in the present invention is: a variable speed wind turbine simulated inertia response control method, comprising:

a1. Based on the maximum wind energy power tracking control strategy, according to the wind speed vw at the hub of the wind turbine and the speed ωr of the wind turbine, the maximum possible wind power captured by the wind turbine is obtained;

a2. Set the maximum possible wind energy capture of the obtained wind turbine as the reference value P0 for active power control of the wind turbine;

a3. Obtain the grid frequency f through the grid frequency measurement equipment such as phase-locked loop;

a4. Based on the grid frequency f, through additional control links, the reference value ΔP for additional control of active power is generated, and superimposed on the reference value P0 of the maximum wind energy tracking control of the wind turbine. After the superposition, the active power control reference value of the wind turbine is P0+ΔP .

Further, the additional control link adopts a relay-like control strategy:

When the grid frequency f change amplitude Δf is greater than a predetermined threshold, the additional control link takes effect;

When the variation amplitude Δf of the grid frequency f is within the predetermined threshold range, the additional control link does not take effect.

Further, the setting of the threshold value of the grid frequency f change amplitude Δf needs to refer to the allowable frequency fluctuation range of the steady-state operation of the power system.

Further, when the change amplitude Δf of the grid frequency f is greater than a predetermined threshold, the operation that the additional control link takes effect specifically includes:

When the magnitude Δf of grid frequency f reduction exceeds the preset threshold, the additional control link generates a positive control signal ΔP1 with a duration of tdcc, which prompts the wind turbine to increase the active power on the basis of the active power P0 corresponding to the maximum power tracking control strategy. That is, the electromagnetic power temporarily maintains P0+ΔP1;

After simulating the inertia response and transient active power support, the additional control link generates a negative control signal ΔP2, so that the active power, that is, the electromagnetic power P0+ΔP2, is temporarily smaller than the mechanical power captured by the wind turbine;

In the recovery process, the active power output by the wind turbine depends on P0+ΔP2, which is smaller than the active power output by the wind turbine in normal operation; by setting the action time tdcc of the additional control reasonably, the decline process of the grid frequency f can be avoided, Obtain good grid frequency response characteristics.

Further, in the operation in which the additional control link takes effect when the change amplitude Δf of the grid frequency f is greater than a predetermined threshold, the control parameters ΔP1, ΔP2, and tdcc of the additional control link are limited by the physical parameters of the wind turbine; the details are as follows :

The selection of the power variation ΔP1 of the wind turbine is determined by the kinetic energy that the wind turbine can provide from the current speed down to the minimum allowable speed. The typical selection value is 5-10% of the rated power of the wind turbine;

The selection of the action time tdcc of the additional control needs to be determined according to the speed and power of the wind turbine;

Due to the decrease in mechanical power, the magnitude of the power change ΔP2 of the wind turbine must be greater than or equal to the amplitude of the decrease in mechanical power in order to maintain the stable operation of the wind turbine;

Limited by the torque, the sum of the magnitudes of the power variation ΔP1 and ΔP2 of the wind turbine should not exceed the preset value.

Further, in step a1, the wind turbine obtains the value and direction of the wind speed vw at the hub of the wind turbine through the wind energy strategy device installed on the nacelle.

Further, in step a1, the speed ωr of the wind turbine is obtained through the speed measuring device installed on the rotor, or through numerical estimation of measured voltage and current.

The variable-speed wind turbine simulation inertia response control method of each embodiment of the present invention includes: based on the maximum wind energy power tracking control strategy, according to the wind speed vw at the hub of the wind turbine and the wind turbine speed ωr, the maximum possible wind power captured by the wind turbine is obtained; The maximum wind energy power that can be captured by the wind turbine is set as the reference value P0 of the active power control of the wind turbine; on the basis of the maximum wind energy power tracking control, additional control is added by using the grid frequency value, and according to the operating conditions of the wind turbine, through the look-up table Or on-line tuning method for short-term constant power support, to realize the simulated inertia response, and at the same time realize the recovery process of the active power of the wind turbine according to a certain power curve; the inherent moment of inertia of the rotor of the wind turbine can be used to realize the simulated inertia control of the wind turbine, for The power grid provides transient active power support; thus it can overcome the insufficient utilization of the inertia response capability of wind turbines in the prior art, the difficulty in controlling physical quantities such as torque and current within a reasonable range, the insufficient optimization of the frequency stability support characteristics of the power system, and poor flexibility , Long response time and other defects, in order to achieve better support for grid frequency stability.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the control block diagram of the simulated inertia response control of the wind turbine in the variable speed wind turbine simulated inertia response control method of the present invention;

Fig. 2 is a graph showing the relationship between the mechanical power captured by the wind turbine of the wind turbine and the rotor speed in the control method for the simulated inertia response of the variable speed wind turbine according to the present invention; Fig. 2 also indicates the changes in the speed and power of the simulated inertia response control method;

Fig. 3 is a curve diagram of electromagnetic power and mechanical power changing with time in the wind turbine simulated inertia response control method of the present invention;

Fig. 4 is a graph showing the variation of electromagnetic power and mechanical power with time during the simulated inertia response control process of the wind turbine under another parameter setting method in the variable-speed wind turbine simulated inertia response control method of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In order to overcome the problems existing in the existing control methods, realize effective variable-speed wind turbine inertia response control and transient active power support, and effectively avoid the occurrence of problems such as too low wind turbine speed and excessive recovery torque; according to the present invention For example, as shown in Figures 1-4, a variable-speed wind turbine simulation inertia response control method is provided, which involves using the rotor inertia and kinetic energy of the wind turbine to realize the control technology of simulated inertia response or transient active power support.

The variable-speed wind turbine simulated inertia response control method of this embodiment is aimed at double-fed asynchronous or full-power converter type wind turbines with variable speed control functions, and adjusts the kinetic energy stored in the rotating parts of the wind turbine through variable speed control. The inherent moment of inertia of the rotor realizes the analog inertia control of wind turbine grid-connected and provides transient active power support for the grid.

The variable-speed wind turbine simulation inertia response control method in this embodiment is based on the maximum power tracking control strategy of the wind turbine, and according to the frequency change of the power grid, through additional control links, the active power control reference value of the wind turbine is correspondingly adjusted to realize the wind turbine. Simulated inertial response to the grid.

Referring to Fig. 1-Fig. 4, the method for controlling the simulated inertia response of the variable-speed wind turbine in this embodiment is specifically described as follows:

A wind turbine is a power generation device that converts wind energy into electrical energy. It converts wind energy into mechanical energy through the wind turbine, and transmits the mechanical energy from the wind turbine to the generator through the transmission device, and the generator converts the mechanical energy into electrical energy, and then transmits it to the power system. Variable-speed wind turbines generally refer to those equipped with power electronic converters that can continuously adjust the rotor speed within a certain range through the control of the converter, so as to control the corresponding speed and pitch angle of the wind turbine for different wind speeds, so that the wind turbine operates at Maximum wind energy power tracking state or rated power state, so as to maximize the use of wind energy resources.

The schematic diagram of active power control of wind turbine is shown in Fig.1. The wind turbine obtains the value and direction of the wind speed vw at the hub of the wind turbine through the wind energy strategy device installed on the nacelle. The wind turbine speed ωr can be estimated by the speed measuring device installed on the rotor, or by measuring the voltage and current values. The maximum wind energy power tracking control strategy can obtain the maximum wind energy power captured by the wind turbine according to the wind speed vw and the speed ωr, and set the reference value P0 of the active power control of the wind turbine.

In order to realize the simulated inertia response of wind turbines, the grid frequency f can be obtained through grid frequency measurement equipment such as phase-locked loops, and the reference value ΔP for additional control of active power is generated through additional control links, and superimposed on the maximum wind energy tracking control reference value P0 of wind turbines above. At this time, the active power control reference value of the wind turbine is P0+ΔP. A temporary additional control link will simulate the inertial response by releasing and recovering the kinetic energy of the rotor.

The additional control link adopts a control strategy similar to a relay. When the variation amplitude Δf of the grid frequency f is greater than a predetermined threshold, the additional control link takes effect. When the variation amplitude Δf of the grid frequency f is within the range of the predetermined threshold, the additional control link does not take effect. The threshold of frequency change Δf is set so that the analog inertia response control only responds to large grid frequency disturbances, and does not respond to small grid frequency disturbances such as steady-state frequency modulation. The threshold can be set with reference to the frequency fluctuation range allowed by the steady state operation of the power system.

Taking the frequency reduction caused by the large disturbance of the power grid as an example, when the magnitude of the power grid frequency reduction exceeds a certain threshold, the additional control link generates a control signal ΔP1 with a positive value of tdcc for a certain period of time, prompting the wind turbine to follow the active power corresponding to the maximum power tracking control strategy. On the basis of power P0, the active power (electromagnetic power) is temporarily maintained at P0+ΔP1 to realize simulated inertial response and transient active power support. At the same time, the rotor releases kinetic energy, the speed drops, and deviates from the normal operating state of the wind turbine. After simulating the inertia response and transient active power support, the additional control link will generate a negative control signal ΔP2, so that the active power (electromagnetic power) P0+ΔP2 is temporarily smaller than the mechanical power captured by the wind turbine, so that the rotor speed increases and the kinetic energy increase, the wind turbines will gradually return to normal operation. The time of action of ΔP2 is tacc. In the recovery process, the active power output by the wind turbine depends on P0+ΔP2, which is smaller than the active power output by the wind turbine during normal operation, but by setting the action time tdcc of the additional control reasonably, the grid frequency can be avoided. , so as to obtain good grid frequency response characteristics. ΔP1 and ΔP2 can be fixed values or variables that change with time.

The control parameters ΔP1, ΔP2, and tdcc of the additional control link are limited by the physical parameters of the wind turbine. The speed of the wind turbine needs to be controlled between the maximum operating speed and the minimum operating speed. The torque of the wind turbine needs to be controlled within a certain range to avoid mechanical loads that cause damage to wind turbines and other components. Other limiting conditions include power, rotor current, and various parameters of the converter.

The action mechanism of the additional control of the doubly-fed asynchronous motor is shown in Figure 2. Curve 106 in the figure is the relationship curve between the mechanical power captured by the wind turbine and the rotational speed at a certain wind speed. For different wind speeds, by controlling the rotational speed, the wind turbine can realize maximum wind energy power tracking, and the maximum wind energy capture power and rotational speed at various wind speeds The relationship is shown in curve 105.

As shown in FIG. 2 , it is assumed that before a large disturbance event occurs in the grid frequency, the wind turbine works at point 101 , and point 101 is the maximum power point on the wind turbine capture power curve 106 obtained through speed control. After the large disturbance occurs, the frequency change exceeds the threshold, and the additional control link obtains the additional power control reference value ΔP1 according to the maximum kinetic energy that the wind turbine rotor can release. The wind turbine works at point 102. After tdcc time, the speed of the wind turbine decreases, and the wind turbine The power drops, and the wind turbine works at point 103. The choice of ΔP1 is determined by the kinetic energy that the wind turbine can provide from the current speed down to the minimum allowable speed, and the typical selection value is 5-10% of the rated power of the wind turbine. The choice of time tdcc is determined according to the speed and power of the wind turbine. The speed of the wind turbine must be above the minimum speed. Due to the decrease in mechanical power, the amplitude of ΔP2 must be greater than or equal to the amplitude of the decrease in mechanical power in order to maintain the stable operation of the wind turbine. However, limited by the torque, the sum of the magnitudes of the power variation ΔP1 and ΔP2 of the wind turbine should not exceed a certain value.

As shown in Figure 2, when the output of the auxiliary control link (that is, the additional control link) changes from ΔP1 to ΔP2, the operating point of the wind turbine changes from point 103 to point 104. The choice of ΔP2 can be taken in many ways. It can be kept constant along the curve 108 to return to the normal operating state point 101; it can also be kept less than a certain value of the mechanical power and returned to the normal operating state point 101 according to the constant acceleration power Pacc; other reasonable curves and values.

Figure 3 shows the change of electromagnetic power and mechanical power with time during the control process of the wind turbine according to the simulated inertia response shown in Figure 2. Curve 207 represents the active power control reference value of the wind turbine, and curve 208 represents the mechanical power output by the wind turbine. Before the large disturbance occurs, the wind turbine operates at power P0. When a disturbance occurs, the operating point of the wind turbine changes from point 201 to point 202. According to the active power reference value P0+ΔP1, the wind generator set gradually changes from the operating state at point 202 to point 203 . At this time, the output of the additional control link changes from ΔP1 to ΔP2, and the operating point of the wind turbine changes from point 203 to point 204. Subsequently, ΔP2 can be kept constant to return to the normal operation state along the curve from point 204 to point 206, or can be restored to the normal operation state along the curve from point 205 to point 205 according to the constant acceleration power Pacc.

Figure 4 shows that when a certain value of ΔP1 is used to realize the simulated inertia response, limited by parameters such as speed and torque, the time tdcc does not reach the expected value, in order to provide good inertia response characteristics and effectively avoid the drop of grid frequency In the initial process of recovery, the value of the parameter ΔP2 is selected as the value of the mechanical power drop and maintained for a period of time. This process is represented by the straight line from point 304 to point 305 in the figure. Then use a larger value of ΔP2 to restore the wind turbine to the normal operating state according to a certain value method.

The control parameter ΔP1 can also be determined according to the needs of the inertia response, and various forms of parameter settings such as segmented curves and gradual curves can be selected, so that a larger value in the previous period can be obtained according to the needs, so that the inertia response characteristics can be quickly realized when the disturbance occurs; It can also be gradually increased to a certain value, so as to avoid the large overshoot of the transient torque.

The determination of the control parameters ΔP1, ΔP2, and tdcc depends on the operating conditions of the wind turbine, and the table look-up method or online setting method can be used. The online tuning method is to calculate and determine the control parameters of the additional control link through the above-mentioned control strategy according to the meteorological measurement parameters such as the real-time operation status of the wind turbine and wind speed. The look-up table method is to obtain the ΔP1, ΔP2, tdcc parameter tables corresponding to the wind speed, speed and other parameters through simulation calculation and experimental test, and use the numerical look-up table of the wind speed, speed and other parameters to obtain the control parameters of the additional control link.

The simulated inertia response control method for variable-speed wind turbines in the above embodiments adopts a relay-like control strategy, and when the grid frequency changes beyond a predetermined threshold, an additional control link takes effect. Taking the reduction of the grid frequency as an example, when the amplitude of the grid frequency reduction exceeds a certain threshold, the additional control link generates a control signal ΔP1 to increase the electromagnetic power of tdcc for a certain period of time, so as to prompt the wind turbine to follow the active power corresponding to the maximum power tracking control strategy. On the basis of power P0, the active power (electromagnetic power) is temporarily maintained at P0+ΔP1 to realize simulated inertial response and transient active power support. At the same time, the rotor releases kinetic energy, the speed drops, and deviates from the normal operating state of the wind turbine. After simulating the inertia response and transient active power support, the additional control link will generate a negative control signal ΔP2, so that the active power (electromagnetic power) P0+ΔP2 is temporarily smaller than the mechanical power captured by the wind turbine, so that the rotor speed increases and the kinetic energy increase, the wind turbines will gradually return to normal operation. In the recovery process, the active power output by the wind turbine depends on P0+ΔP2, which is smaller than the active power output by the wind turbine during normal operation, but by setting the action time tdcc of the additional control reasonably, the grid frequency can be avoided. , so as to obtain good grid frequency response characteristics. ΔP1 and ΔP2 can be fixed values or variables that change with time.

In summary, the variable-speed wind turbine simulation inertia response control methods of the above-mentioned embodiments of the present invention can at least achieve the following beneficial effects:

(1) The setting of the frequency change threshold makes the analog inertia response control only respond to large grid frequency disturbances, and does not respond to small grid frequency disturbances such as steady-state frequency modulation.

(2) The determination of the control parameters ΔP1, ΔP2, and tdcc does not need to obtain any one of the parameters such as the frequency change rate, the frequency deviation change rate, the frequency deviation amplitude, and the integral of the frequency deviation.

(3) The control parameters ΔP1, ΔP2, and tdcc of the additional control link are limited by the physical parameters of the wind turbine. The kinetic energy Ek=0.5×J×ω2 that the wind turbine can release depends on the variation range of the moment of inertia J and the rotational speed ω. The speed of the wind turbine needs to be controlled between the maximum operating speed and the minimum operating speed. The torque of the wind turbine needs to be controlled within a certain range to avoid mechanical loads that cause damage to wind turbines and other components. Other limiting conditions include power, rotor current, and various parameters of the converter.

(4) The determination of the control parameters ΔP1, ΔP2, and tdcc depends on the operating conditions of the wind turbine, and the method of looking up the table or online setting can be used. The table look-up method is to use the wind speed and wind turbine rotor speed information to look up the table to obtain the control parameters of the additional control link through the preset parameter table. The online tuning method is to determine the control parameters of the additional control link through calculation according to the real-time operation status of the wind turbine and meteorological measurement parameters such as wind speed.

(5) It can make full use of the moment of inertia of the wind turbine to provide an inertia response for the frequency disturbance of the grid, and at the same time ensure that the parameters of the wind turbine are within a reasonable operating range. Too big and so on. The variable-speed wind turbine simulation inertia response control method can effectively reduce the frequency deviation amplitude and change rate after a large frequency disturbance event occurs, and improve the frequency stability of the power system.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. a variable-speed wind-power unit simulated inertia response control mehtod, is characterized in that, comprising:

A1, based on maximal wind-energy power tracking control strategy, according to the wind speed vw of wind-powered machine unit hub place and wind-powered electricity generation unit rotational speed omega r, obtain the wind energy power that the wind turbine maximum possible is caught;

A2, the wind energy power of catching according to gained wind turbine maximum possible, the reference value P0 of setting wind-powered electricity generation unit real power control;

A3, by grid frequency measurement equipment such as phase-locked loops, obtain mains frequency f;

A4, based on mains frequency f, by additional controlling unit, generate the additional reference value Δ P controlled of active power, and the wind turbine generator maximum wind energy that is added to follows the tracks of that to control reference value P0 upper, after stack, to control reference value be P0+ Δ P to the active power of wind-powered electricity generation unit.

2. according to the variable-speed wind-power unit simulated inertia response control mehtod described in claim 1, it is characterized in that described additional controlling unit adopts the control strategy of similar relay system:

When mains frequency f variation amplitude Δ f is greater than predetermined threshold value, additional controlling unit is had an effect;

When mains frequency f variation amplitude Δ f is in the scope of predetermined threshold value, additional controlling unit is not had an effect.

3. according to the described variable-speed wind-power unit of claim 1-2 simulated inertia response control mehtod, it is characterized in that, described when mains frequency f variation amplitude Δ f is greater than predetermined threshold value, the operation that additional controlling unit is had an effect specifically comprises:

When the amplitude Δ f of mains frequency f reduction surpasses default threshold value, it is tdcc on the occasion of control signal Δ P1 that additional controlling unit produces duration, impel on the basis of the active-power P 0 that the wind-powered electricity generation unit is corresponding at the maximal power tracing control strategy, active power is that electromagnetic power temporarily maintains P0+ Δ P1;

After simulated inertia response and the support of transient state active power, additional controlling unit produces the control signal Δ P2 of negative value, and making active power is that electromagnetic power P0+ Δ P2 temporarily is less than the mechanical output that wind turbine is caught;

In the process of recovering, the active power of wind-powered electricity generation unit output depends on P0+ Δ P2, the active power of output when being less than the wind-powered electricity generation unit and normally moving; By additional tdcc action time controlled of reasonable setting, can avoid the decline process of mains frequency f, obtain good mains frequency response characteristic.

4. according to the variable-speed wind-power unit simulated inertia response control mehtod described in claim 1, it is characterized in that, in step a1, the wind-powered electricity generation unit, by being arranged on the wind energy strategy device on cabin, obtains numerical value and the direction of the wind speed vw at wind-powered machine unit hub place.

5. according to the variable-speed wind-power unit simulated inertia response control mehtod described in claim 1, it is characterized in that, in step a1, by being arranged on epitrochanterian rotation-speed measuring device, perhaps, by the numerical estimation of measuring voltage, electric current, obtain wind-powered electricity generation unit rotational speed omega r.

6. variable-speed wind-power unit simulated inertia response control mehtod according to claim 2, is characterized in that, described mains frequency f changes the setting of the threshold value of amplitude Δ f, the frequency fluctuation scope that need to allow with reference to the power system mesomeric state operation.

7. variable-speed wind-power unit simulated inertia response control mehtod according to claim 3, is characterized in that, Δ P1, Δ P2 can be fixed numbers, can be also time dependent variablees; Control definite running of wind generating set operating mode that depends on of parameter Δ P1, Δ P2, tdcc, can adopt the method for look-up table or on-line tuning; Specific as follows:

The on-line tuning method is according to meteorologic survey parameters such as the real-time running state of wind-powered electricity generation unit and wind speed, by the control parameter of the additional controlling unit of above-mentioned control strategy calculative determination;

Look-up table is to obtain Δ P1, Δ P2, the tdcc parameter list corresponding with parameters such as wind speed, rotating speeds by simulation calculation and experiment test, utilizes wind speed, the isoparametric numerical value of rotating speed to table look-up and obtains the control parameter of additional controlling unit.

8. variable-speed wind-power unit simulated inertia response control mehtod according to claim 3, it is characterized in that, control determining of parameter Δ P1, Δ P2, tdcc and do not need to obtain any one in the parameters such as integration of frequency variation rate, frequency departure rate of change, frequency departure amplitude, frequency departure.

9. variable-speed wind-power unit simulated inertia response control mehtod according to claim 3, it is characterized in that, described when mains frequency f changes amplitude Δ f and is greater than predetermined threshold value, in the operation that additional controlling unit is had an effect, the control parameter Δ P1 of additional controlling unit, the restriction that Δ P2, tdcc are subject to wind-powered electricity generation unit physical parameter; Specific as follows:

The selective basis wind-powered electricity generation unit of the power variation Δ P1 of wind-powered electricity generation unit drops to the kinetic energy decision that minimum permission rotating speed can provide, the 5-10% that typical selected value is wind-powered electricity generation unit rated power from current rotating speed;

Additional control action time tdcc selection, need to be according to rotating speed and the power determination of wind-powered electricity generation unit;

Because mechanical output descends, the amplitude of the power variation Δ P2 of wind-powered electricity generation unit, be greater than or equal the amplitude that mechanical output descends, and could keep the wind-powered electricity generation stable operation of unit;

The restriction of torque suspension, the power variation Δ P1 of wind-powered electricity generation unit and Δ P2 amplitude sum, should be no more than preset value.

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