CN113746196B - Nuclear power plant emergency power supply control system and method - Google Patents

Abstract

The invention discloses a nuclear power plant emergency power supply control system and method. The system includes: a DC bus, a lithium battery power supply device, a solar power supply device, a wind energy power supply device, a hydrogen power supply device, a system working power supply, a dual power supply automatic switching switch and an energy management device; the energy management device includes a standby working condition control unit and an emergency working condition control unit, and the emergency working condition control unit includes a time judging module, which is used to judge whether the time to enter the emergency working condition is lower than a time threshold, and selectively output Lithium battery power supply signal or auxiliary energy power supply signal. In the nuclear power plant emergency power supply control system and method of the present invention, three kinds of clean energy power supply devices are set, and are managed by the energy management device, so as to ensure the supply of emergency power supply, the clean energy is effectively used for power supply and charging, and the reliability of the system is improved. , Reduce the difficulty of operation and maintenance, reduce the cost of electricity, reduce exhaust emissions and noise pollution.

Description

Nuclear Power Plant Emergency Power Control System and Method

technical field

The invention relates to the technical field of nuclear power plant emergency power supply, in particular to a nuclear power plant emergency power supply control system and method.

Background technique

At present, the LLS system (hydraulic test pump turbine generator set), emergency command center and security building of nuclear power plants are all equipped with 380V emergency diesel engines and power distribution equipment. When the external power source is lost, the emergency diesel engine generates power to the downstream emergency load, and the diesel generator has the following problems:

(1) The system is complex and contains mechanical rotating equipment, resulting in a high failure rate of equipment and a high risk of startup failure;

(2) Exhaust gas after diesel combustion is discharged during power generation, polluting the environment;

(3) The noise is loud during power generation, which affects the surrounding people;

(4) The oil storage tank occupies a large area, and the cost of regular replacement of diesel in the oil tank is high.

Contents of the invention

The technical problem to be solved by the present invention is to provide an improved nuclear power plant emergency power control system and method for the above defects.

The technical solution adopted by the present invention to solve the technical problem is to provide a nuclear power plant emergency power control system, including:

DC bus;

Lithium battery power supply device, connected to the DC bus, used to provide lithium battery power;

a solar power supply device connected to the DC bus for providing solar power;

A wind energy power supply device, connected to the DC bus, for providing wind energy power generation;

A hydrogen power supply device connected to the DC bus for providing hydrogen power generation;

The system working power supply is connected to the DC bus and used to provide system working power;

A dual-power automatic transfer switch is connected to the mains, the downstream load and the DC bus respectively, and the dual-power automatic transfer switch is used to selectively connect the mains and the downstream load according to the closed switch of the mains. a load, or the DC bus and the downstream load; and

An energy management device, the energy management device comprising:

The standby working condition control unit is used to start the standby working condition when the dual power automatic transfer switch connects the mains and the downstream load; the standby working condition control unit includes a standby charging module for judging the Whether the capacity of the lithium battery power supply device is lower than a capacity threshold, and selectively output a backup charging signal; the solar power supply device and the wind energy power supply device are also used to charge the lithium battery power supply device according to the backup charging signal ;

The emergency working condition control unit is used to start the emergency working condition when the dual power supply automatic transfer switch connects the DC bus and the downstream load; Whether the time of the working condition is lower than a time threshold, and selectively output a lithium battery power supply signal or an auxiliary energy power supply signal; the lithium battery power supply device is also used to supply power to the downstream load according to the lithium battery power supply signal, so The solar power supply device, the wind energy power supply device, and the hydrogen power supply device are also used to supply power to the downstream load according to the auxiliary energy supply signal.

Preferably, the emergency working condition control unit further includes an emergency charging module for judging whether the sum of the power of the solar power supply device, the wind energy power supply device and the hydrogen power supply device exceeds the power required by the downstream load, and Selectively output an emergency charging signal; the solar power supply device, the wind energy power supply device and the hydrogen power supply device are also used to charge the lithium battery power supply device according to the emergency charging signal.

Preferably, the standby mode control unit further includes a clean power supply module, which is used to judge whether the output power of the solar power supply device or the wind energy power supply device exceeds a power threshold, and selectively output a clean charging signal or commercial power charging signal; the solar power supply device and the wind energy power supply device are also used to charge the lithium battery power supply device according to the clean charging signal; the commercial power is also used to charge the lithium battery power supply device according to the commercial power charging signal Battery-powered unit charging.

Preferably, the emergency working condition control unit further includes a lithium battery protection module, configured to determine whether the state of charge of the lithium battery power supply device is lower than a state of charge threshold, and selectively output a lithium battery alarm signal.

Preferably, the emergency working condition control unit further includes a hydrogen leakage monitoring module, configured to determine whether the hydrogen leakage data exceeds a safety threshold, and selectively output a hydrogen leakage alarm signal.

Also provided is a nuclear power plant emergency power control method, using the nuclear power plant emergency power control system described above to perform the following steps:

S1. Determine whether the commercial power is connected, if so, then execute step S2, if not, then execute step S3;

S2. Connect the mains and downstream loads, start the standby mode, and judge whether the capacity of the lithium battery power supply device is lower than a capacity threshold, if so, output a backup charging signal; the solar power supply device and the wind energy power supply device The charging signal charges the lithium battery power supply device;

S3. Connect the DC bus and the downstream load, start the emergency working condition, judge whether the time to enter the emergency working condition is lower than a time threshold, if so, output the lithium battery power supply signal; if not, output the auxiliary energy supply signal; the lithium battery power supply device supplies power to the downstream load according to the lithium battery power supply signal, and the solar power supply device, the wind energy power supply device, and the hydrogen power supply device supply power to the downstream load according to the auxiliary energy power supply signal .

Preferably, the step S3 also includes a step S31: judging whether the total power of the solar power supply device, the wind energy power supply device and the hydrogen power supply device exceeds the power required by the downstream load, and if so, output emergency charging Signal; the solar power supply device, the wind energy power supply device and the hydrogen power supply device charge the lithium battery power supply device according to the emergency charging signal.

Preferably, the step S2 also includes S21: judging whether the output power of the solar power supply device and the wind energy power supply device exceeds a power threshold, if so, output a clean charging signal; if not, output a commercial power charging signal The solar power supply device and the wind energy power supply device charge the lithium battery power supply device according to the clean charging signal; the commercial power charges the lithium battery power supply device according to the commercial power charging signal.

Preferably, the step S3 further includes S32: judging whether the state of charge of the lithium battery power supply device is lower than a state of charge threshold, and if so, outputting a lithium battery alarm signal.

Preferably, the step S3 further includes S33: judging whether the hydrogen leakage data exceeds a safety threshold, and if so, outputting a hydrogen leakage alarm signal.

The beneficial effect of implementing the present invention is: in the nuclear power plant emergency power supply control system and method of the present invention, three kinds of clean energy power supply devices are set: solar power supply device, wind energy power supply device, hydrogen power supply device, and are managed by the energy management device; Under standby working conditions, the lithium battery power supply device is charged; under emergency working conditions, the lithium battery and clean energy power supply are triggered according to the length of time to ensure the supply of emergency power, and clean energy is effectively used for power supply and charging, replacing the current There is a 380V emergency diesel engine in the technology, which improves system reliability, reduces the difficulty of operation and maintenance, reduces the cost of electricity, reduces exhaust emissions and noise pollution.

Specifically, in the nuclear power plant emergency power supply control system and method of the present invention:

1) There are no mechanical rotating parts, important modules are connected in parallel, and redundancy is set up, which can improve the reliability of the emergency power supply system;

2) The system is composed of standardized equipment modules, which is convenient for operation and maintenance;

3) Seaside wind energy and solar energy resources are abundant, using renewable energy solar energy and wind energy to reduce electricity cost;

4) Avoid waste gas emissions during emergency power supply and reduce carbon emissions;

5) The power generation noise is small, reducing the possibility of occupational diseases for power plant workers.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic diagram of the module principle of the emergency power supply control system of a nuclear power plant in some embodiments of the present invention;

Fig. 2 is a block schematic diagram of the energy management device in Fig. 1;

Fig. 3 is a flow chart of a nuclear power plant emergency power control method in some embodiments of the present invention;

Fig. 4 is a flow chart of step S21 of the emergency power control method of a nuclear power plant in some embodiments of the present invention;

Fig. 5 is a flow chart of step S31 of the emergency power control method of a nuclear power plant in some embodiments of the present invention;

Fig. 6 is a flow chart of step S32 of the emergency power control method of a nuclear power plant in some embodiments of the present invention;

Fig. 7 is a flow chart of step S33 of the emergency power control method of a nuclear power plant in some embodiments of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 shows a nuclear power plant emergency power control system 100 in some embodiments of the present invention, which is used to provide emergency power and provide different charging and power supply modes according to different working conditions. The emergency power supply control system 100 of the nuclear power plant in some embodiments of the present invention cancels the 380V emergency diesel engine, and introduces new energy technologies such as wind power, solar energy, hydrogen energy, and lithium batteries into the emergency power supply system of the nuclear power plant to form a new type of hydrogen battery-based 380V emergency power supply system for nuclear power plants.

The nuclear power plant emergency power supply control system 100 in the embodiment of the present invention includes a DC bus 10, a lithium battery power supply device 20, a solar power supply device 30, a wind energy power supply device 40, a hydrogen power supply device 50, a system working power supply 60, and a dual power supply automatic switching switch 70 and energy management device 80 . The DC bus 10 connects the external downstream load 300 and the mains 200, and connects each module; the dual power supply automatic transfer switch 70 is used to select the DC bus 10 or the mains 200 to connect to the downstream load 300 according to whether the mains 200 is disconnected; The system working power supply 60 is used to provide power for the nuclear power plant emergency power supply control system 100; the solar power supply device 30, the wind energy power supply device 40, and the hydrogen power supply device 50 provide clean energy; the energy management device 80 is used to control each module under different working conditions The relationship between charging and power supply; the lithium battery power supply device 20 is used to be charged through the DC bus 10 or to charge the downstream load 300 .

Among them, the DC bus 10 is connected to the external downstream load 300 and the mains 200, and the DC bus 10 is also connected to the lithium battery power supply device 20, the solar power supply device 30, the wind energy power supply device 40, and the hydrogen power supply device 50, and each power supply device is connected to itself . The advantage of setting the DC bus 10 is that it can solve the synchronization problem of the AC bus. Moreover, the charging process between the lithium battery power supply device 20, the solar power supply device 30, the wind energy power supply device 40, and the hydrogen power supply device 50, as well as the power supply process of each power supply device to the downstream load 300, are also carried out through the DC bus 10. convert.

The system working power supply 60 is connected to the DC bus 10 for providing system working power. That is, the system working power supply 60 provides internal working electric energy for the emergency power supply control system 100 of the nuclear power plant according to the embodiment of the present invention.

The dual-power automatic transfer switch 70 is respectively connected to the mains 200, the downstream load 300 and the DC bus 10, and the dual-power automatic transfer switch 70 is used to selectively connect the mains 200 and the downstream load 300 according to the closed switch of the mains 200, or The DC bus 10 and the downstream load 300 . Specifically, the closed switch condition here includes the mains 200 being closed and the mains 200 being disconnected, and the dual power automatic transfer switch 70 selects the DC bus 10 or the mains 200 to connect the downstream load 300 according to whether the mains 200 is off. When the mains 200 is connected, that is, when the mains 200 supplies power normally, connect the mains 200 and the downstream load 300; when the mains 200 is disconnected, that is, when the mains 200 cannot supply power normally, connect the DC bus 10 and the downstream Load 300.

The lithium battery power supply device 20 is connected to the DC bus 10 for providing lithium battery power. In some specific embodiments, the lithium battery power supply device 20 includes a lithium battery, a bidirectional DC converter and a current transformer, and the three are connected in sequence, so that the electric energy between the lithium battery and the DC bus 10 can be bidirectionally supplied. It should be noted that, the specific implementation manner of the lithium battery power supply device 20 is not limited thereto, as long as the function of bidirectional power supply can be realized.

The solar power supply device 30 is connected with the DC bus 10 for providing solar power generation electric energy. In some specific embodiments, the solar power supply device 30 includes a solar power generation module, a unidirectional DC converter and a current transformer, and the three are connected in sequence, so that the solar power supply device 30 converts solar energy into electrical energy. It should be noted that, the specific implementation manner of the solar power supply device 30 is not limited thereto, as long as the function of power supply by solar energy can be realized.

The wind energy power supply device 40 is connected with the DC bus 10 for providing wind energy power generation. In some specific implementations, the wind power supply device 40 includes a wind power generation module, a rectifier and a current transformer, and the three are connected in sequence, so that the wind power supply device 40 converts wind energy into electrical energy. It should be noted that, the specific implementation manner of the wind energy power supply device 40 is not limited thereto, as long as the function of power supply by wind energy can be realized.

The hydrogen power supply device 50 is connected with the DC bus 10 and is used for providing hydrogen power generation electric energy. In some specific embodiments, the hydrogen power supply device 50 includes a PEM hydrogen battery module, a unidirectional DC converter and a current transformer, and the three are connected in sequence, so that the hydrogen power supply device 50 converts hydrogen in compressed air into electrical energy. It should be noted that, the specific implementation manner of the hydrogen power supply device 50 is not limited thereto, as long as the function of power supply by hydrogen gas can be realized.

For example, in some embodiments, the hydrogen power supply device 50 includes a hydrogen bottle with hydrogen stored therein, so as to convert the hydrogen in the hydrogen bottle into electrical energy.

In some other preferred embodiments, the hydrogen power supply device 50 also includes a water electrolysis hydrogen production device, which is used to produce hydrogen by electrolysis of water. The advantage of this is that when the wind energy is sufficient, the consumed hydrogen can be replenished, thereby enhancing the self-completeness and energy efficiency of the system. And compared with the setting of the hydrogen bottle, the electrolytic water hydrogen production device can save the trouble of replacing the hydrogen in the hydrogen bottle after it is used up, which is more convenient. The energy management device 80 includes a standby working condition control unit 81 and an emergency working condition control unit 82 . In some embodiments, the energy management device 80 is used to monitor the voltage and current data of each power supply such as the lithium battery power supply device 20, the solar power supply device 30, the wind energy power supply device 40, the hydrogen power supply device 50, and identify the available status of each power supply , control the power supply ratio of each power supply, and use solar energy and wind energy as much as possible.

As shown in FIG. 1 and FIG. 2 , the standby mode control unit 81 is used to start the standby mode when the dual power automatic transfer switch 70 connects the mains 200 and the downstream load 300 . Specifically, the standby working condition control unit 81 includes a standby charging module 811 and a cleaning power supply module 812 .

Wherein, the backup charging module 811 is used for judging whether the capacity of the lithium battery power supply device 20 is lower than a capacity threshold, and selectively outputting a backup charging signal. If the capacity of the lithium battery power supply device 20 is lower than the capacity threshold, no backup charging signal is output; if the capacity of the lithium battery power supply device 20 is lower than the capacity threshold, a backup charging signal is output. The solar power supply device 30 and the wind energy power supply device 40 are also used to charge the lithium battery power supply device 20 according to the standby charging signal. Alternatively, the capacity threshold is 50%-70%. Preferably, the capacity threshold is 60%. In some specific embodiments, when the capacity of the lithium battery power supply device 20 is lower than 60%, the solar power supply device 30 and the wind energy power supply device 40 are given priority to charging the lithium battery power supply device 20 to 80%. If the device 40 is unavailable, the lithium battery power supply device 20 is charged by the commercial power 200 .

It should be noted that the supply of wind power and solar power in the wind power supply device 40 and solar power supply device 30 is greatly affected by environmental factors. For example, when there is no solar energy or no wind at night, wind power and solar power are not available at this time.

The clean power supply module 812 is used to judge whether the output power of the solar power supply device 30 or the wind energy power supply device 40 exceeds a power threshold, and selectively output a clean charging signal or a mains charging signal. If the output power of solar power supply device 30, wind power supply device 40 exceeds the power threshold, then output a clean charging signal, and charge lithium battery power supply device 20 by clean energy; threshold, then output a commercial power charging signal, and charge the lithium battery power supply device 20 through the commercial power 200 . The solar power supply device 30 and the wind energy power supply device 40 are also used to charge the lithium battery power supply device 20 according to the clean charging signal; the commercial power 200 is also used to charge the lithium battery power supply device 20 according to the commercial power charging signal. In some embodiments, assuming that the power requirement of the system working power supply 60 is P, and the power supplied by wind power and solar power is less than P, this part of the power difference needs to be supplied by the mains 200 through the clean power supply module 812 in the energy management and control system. In some specific embodiments, under the standby working condition, the downstream load 300 is powered by the mains 200 (voltage 380V) as the main power supply, the hydrogen power supply device 50 is in a standby state, and the system working power supply 60 is preferentially supplied by the solar power supply device 30 or the wind power supply device. 40 for power supply, if the solar power supply device 30 and the wind energy power supply device 40 are not available, then the commercial power supply 200 is used for power supply.

The emergency working condition control unit 82 is used for starting the emergency working condition when the dual power automatic transfer switch 70 connects the DC bus 10 and the downstream load 300 . In some preferred embodiments, when the mains power supply 200 (main power supply) is lost under emergency conditions, the power supply of the downstream load 300 is automatically switched to the emergency power supply. In the early stage of the emergency, the downstream load is powered by the lithium battery power supply device 20. The solar power supply device 30 and the wind energy power supply device 40 supply power. If the solar power supply device 30 and the wind energy power supply device 40 are unavailable, then the hydrogen power supply device 50 supplies power. Lithium battery power supply device 20 is as regulating system, absorbs electric energy when hydrogen power supply device 50, solar power supply device 30, wind power supply device 40 can output exceed downstream load, and hydrogen power supply device 50, solar power supply device 30, wind energy power supply device 40 output less than Provide peak load when load demand, to ensure stable output voltage.

The emergency working condition control unit 82 includes a time judging module 821 , an emergency charging module 822 , a lithium battery protection module 823 and a hydrogen leakage monitoring module 824 .

The time judging module 821 is used to judge whether the time of entering the emergency working condition is lower than a time threshold, and selectively outputs a lithium battery power supply signal or an auxiliary energy power supply signal; the lithium battery power supply device 20 is also used to provide downstream The load 300 supplies power, and the solar power supply device 30 , the wind energy power supply device 40 , and the hydrogen power supply device 50 are also used to supply power to the downstream load 300 according to the auxiliary energy supply signal. In some embodiments, the time threshold is 5-10 minutes. Preferably, the time threshold is 5 minutes. In some embodiments, the initial stage of emergency is 0-5 minutes; the middle stage of emergency is 5-10 minutes; the post-emergency period is 10 minutes-end of emergency.

The emergency charging module 822 is used to judge whether the total power of the solar power supply device 30, the wind energy power supply device 40 and the hydrogen power supply device 50 exceeds the power required by the downstream load 300, and selectively output an emergency charging signal; the solar power supply device 30, the wind energy power supply device 40 and the hydrogen power supply device 50 are also used to charge the lithium battery power supply device 20 according to the emergency charging signal. In some embodiments, if the load demand of the downstream load 300 is P1, the hydrogen power supply device 50, the solar power supply device 30, and the wind energy power supply device 40 output P2, and P2<P1, then the lithium battery power supply device 20 provides P1-P2 power at this time .

The lithium battery protection module 823 is used to determine whether the state of charge of the lithium battery power supply device 20 is lower than a state of charge threshold, and selectively output a lithium battery alarm signal. In some embodiments, the energy management device 80 also controls the SOC (State of charge) of the lithium battery power supply device 20 through the lithium battery protection module 823, which is used to reflect the remaining capacity of the battery, which is numerically defined as the remaining capacity The ratio to the battery capacity, usually expressed as a percentage), is kept between 60% and 80%. Alternatively, the state of charge threshold is 60%-80%. Preferably, the state of charge threshold is 70%.

The hydrogen leakage monitoring module 824 is used to determine whether the hydrogen leakage data exceeds a safety threshold, and selectively output a hydrogen leakage alarm signal. In some embodiments, the energy management device 80 also monitors the hydrogen leakage data of the hydrogen power supply device 50 through the hydrogen leakage monitoring module 824, and shuts off the hydrogen and compressed air intake of the PEM hydrogen battery module in the hydrogen power supply device 50 when the value exceeds a certain value. valve. Preferably, the above fixed value in the hydrogen leakage data is: the hydrogen content in the air is 0.5%. That is, the safety threshold is 0.5%.

The specific execution steps of the nuclear power plant emergency power control system 100 in some embodiments of the present invention will be described below with reference to FIGS. 1-7 and the nuclear power plant emergency power control method in some embodiments of the present invention. The emergency power supply control method of a nuclear power plant in some embodiments of the present invention is used to provide emergency power supply, and provides different charging and power supply modes according to different working conditions. In the embodiment of the present invention, the emergency power supply control method of a nuclear power plant includes steps S1-S3.

S1. Determine whether the commercial power 200 is connected, if yes, execute step S2, if not, execute step S3. Specifically, the dual power automatic transfer switch 70 selects the DC bus 10 or the mains 200 to connect to the downstream load 300 according to whether the mains 200 is disconnected.

S2. connect the mains 200 and the downstream load 300, start the standby mode, judge whether the capacity of the lithium battery power supply device 20 is lower than a capacity threshold, if so, output a backup charging signal; the solar power supply device 30 and the wind energy power supply device 40 according to The standby charging signal charges the lithium battery power supply device 20 . Specifically, when the mains 200 is connected, that is, when the mains 200 supplies power normally, the dual power supply automatic transfer switch 70 connects the mains 200 and the downstream load 300; when the mains 200 is disconnected, that is, the mains 200 cannot supply power normally. , the dual power automatic transfer switch 70 connects the DC bus 10 and the downstream load 300 .

Specifically, the backup charging module 811 determines whether the capacity of the lithium battery power supply device 20 is lower than a capacity threshold, and selectively outputs a backup charging signal. If the capacity of the lithium battery power supply device 20 is lower than the capacity threshold, no backup charging signal is output; if the capacity of the lithium battery power supply device 20 is lower than the capacity threshold, a backup charging signal is output. Alternatively, the capacity threshold is 50%-70%. Preferably, the capacity threshold is 60%.

As shown in FIGS. 1-4, in some embodiments, step S2 also includes S21; judge whether the output power of the solar power supply device 30 and the wind power supply device 40 exceeds a power threshold, and if so, output a clean charging signal; if not , then output the mains charging signal; the solar power supply device 30 and the wind power supply device 40 charge the lithium battery power supply device 20 according to the cleaning charging signal; the mains 200 charges the lithium battery power supply device 20 according to the mains charging signal. Specifically, the clean power supply module 812 judges whether the output power of the solar power supply device 30 or the wind energy power supply device 40 exceeds a power threshold, and selectively outputs a clean charging signal or a mains charging signal.

S3. Connect the DC bus 10 and the downstream load 300, start the emergency working condition, judge whether the time to enter the emergency working condition is lower than a time threshold, if so, output the lithium battery power supply signal; if not, output the auxiliary energy supply signal; The lithium battery power supply device 20 supplies power to the downstream load 300 according to the lithium battery power supply signal, and the solar power supply device 30 , the wind energy power supply device 40 , and the hydrogen power supply device 50 supply power to the downstream load 300 according to the auxiliary energy supply signal. Specifically, the time judging module 821 judges whether the time of entering the emergency working condition is lower than a time threshold, and selectively outputs a lithium battery power supply signal or an auxiliary energy power supply signal. In some embodiments, the time threshold is 5-10 minutes. Preferably, the time threshold is 5 minutes. In some embodiments, the initial stage of emergency is 0-5 minutes; the middle stage of emergency is 5-10 minutes; the post-emergency period is 10 minutes-end of emergency.

1-3, 5, in some embodiments, step S3 also includes step S31: determine whether the sum of the power of the solar power supply device 30, the wind energy power supply device 40 and the hydrogen power supply device 50 exceeds the power required by the downstream load 300 , if so, output an emergency charging signal; the solar power supply device 30, the wind energy power supply device 40 and the hydrogen power supply device 50 charge the lithium battery power supply device 20 according to the emergency charging signal. Specifically, the emergency charging module 822 judges whether the total power of the solar power supply device 30 , the wind energy power supply device 40 and the hydrogen power supply device 50 exceeds the power required by the downstream load 300 , and selectively outputs an emergency charging signal. In some embodiments, if the load demand of the downstream load 300 is P1, the sum of the power output of the hydrogen power supply device 50, the solar power supply device 30, and the wind energy power supply device 40 is P2, and P2<P1, then the lithium battery power supply device 20 provides P1 at this time. -P2 power.

As shown in FIGS. 1-3 and 6, in some embodiments, preferably, step S3 also includes S32: judging whether the state of charge of the lithium battery power supply device 20 is lower than a state of charge threshold, and if so, output lithium Battery warning signal. In some embodiments, the lithium battery protection module 823 determines whether the state of charge of the lithium battery power supply device 20 is lower than a state of charge threshold, and selectively outputs a lithium battery alarm signal. Alternatively, the state of charge threshold is 60%-80%. Preferably, the state of charge threshold is 70%.

As shown in FIGS. 1-3 and 7 , in some embodiments, step S3 also includes S33 : judging whether the hydrogen leakage data exceeds a safety threshold, and if so, outputting a hydrogen leakage alarm signal. In some embodiments, the hydrogen leakage monitoring module 824 determines whether the hydrogen leakage data exceeds a safety threshold, and selectively outputs a hydrogen leakage alarm signal. Preferably, the safety threshold is 0.5%.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples, and all technical solutions that fall under the idea of the present invention belong to the scope of protection of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A nuclear power plant emergency power control system, comprising:

a DC bus (10);

the lithium battery power supply device (20) is connected with the direct current bus (10), and the lithium battery power supply device (20) is used for providing lithium battery power;

the solar power supply device (30) is connected with the direct current bus (10), and the solar power supply device (30) is used for providing solar power generation electric energy;

the wind energy power supply device (40) is connected with the direct current bus (10), and the wind energy power supply device (40) is used for providing wind energy to generate electric energy;

the hydrogen power supply device (50) is connected with the direct current bus (10), and the hydrogen power supply device (50) is used for providing hydrogen power generation electric energy;

a system working power supply (60) connected with the direct current bus (10), wherein the system working power supply (60) is used for providing system working electric energy;

the dual-power automatic transfer switch (70) is respectively connected with a commercial power (200), a downstream load (300) and the direct current bus (10), and the dual-power automatic transfer switch (70) is used for selectively connecting the commercial power (200) with the downstream load (300) or connecting the direct current bus (10) with the downstream load (300) according to the closing condition of the commercial power (200); and

an energy management device (80), the energy management device (80) comprising:

a standby condition control unit (81) for starting a standby condition when the dual-power automatic change-over switch (70) turns on the utility power (200) and the downstream load (300); the standby working condition control unit (81) comprises a standby charging module (811) for judging whether the capacity of the lithium battery power supply device (20) is lower than a capacity threshold value and selectively outputting a standby charging signal; the solar power supply device (30) and the wind power supply device (40) are also used for charging the lithium battery power supply device (20) according to the standby charging signal;

an emergency working condition control unit (82) for starting an emergency working condition when the dual-power automatic change-over switch (70) is connected with the direct current bus (10) and the downstream load (300); the emergency working condition control unit (82) comprises a time judging module (821) for judging whether the time for entering the emergency working condition is lower than a time threshold value and selectively outputting a lithium battery power supply signal or an auxiliary energy power supply signal; the lithium battery power supply device (20) is further used for supplying power to the downstream load (300) according to the lithium battery power supply signal, and the solar power supply device (30), the wind power supply device (40) and the hydrogen power supply device (50) are further used for supplying power to the downstream load (300) according to the auxiliary energy power supply signal.

2. The nuclear power plant emergency power supply control system according to claim 1, wherein the emergency condition control unit (82) further includes an emergency charging module (822) for determining whether a sum of power of the solar power supply device (30), the wind power supply device (40), and the hydrogen power supply device (50) exceeds a power required by the downstream load (300), and selectively outputting an emergency charging signal; the solar power supply device (30), the wind power supply device (40) and the hydrogen power supply device (50) are further used for charging the lithium battery power supply device (20) according to the emergency charging signal.

3. The nuclear power plant emergency power supply control system according to claim 1, wherein the standby condition control unit (81) further comprises a clean power supply module (812) for determining whether the output power of the solar power supply device (30) and the wind power supply device (40) exceeds a power threshold value, and selectively outputting a clean charging signal or a mains charging signal; the solar power supply device (30) and the wind power supply device (40) are also used for charging the lithium battery power supply device (20) according to the cleaning charging signal; the mains (200) is also used for charging the lithium battery powered device (20) according to the mains charging signal.

4. A nuclear plant emergency power supply control system according to any one of claims 1-3, wherein the emergency condition control unit (82) further comprises a lithium battery protection module (823) for determining whether the state of charge of the lithium battery powered device (20) is below a state of charge threshold, and selectively outputting a lithium battery alarm signal.

5. A nuclear power plant emergency power supply control system according to any one of claims 1 to 3, wherein the emergency condition control unit (82) further includes a hydrogen leakage monitoring module (824) for determining whether the hydrogen leakage data exceeds a safety threshold and selectively outputting a hydrogen leakage alarm signal.

6. A method of controlling an emergency power supply for a nuclear power plant, characterized by performing the following steps with the emergency power supply control system (100) for a nuclear power plant according to any one of claims 1-5:

s1, judging whether the commercial power (200) is on, if so, executing a step S2, and if not, executing a step S3;

s2, switching on the commercial power (200) and the downstream load (300), starting a standby working condition, judging whether the capacity of the lithium battery power supply device (20) is lower than a capacity threshold value, and if yes, outputting a standby charging signal; the solar power supply device (30) and the wind power supply device (40) charge the lithium battery power supply device (20) according to the standby charging signal;

s3, connecting a direct current bus (10) with the downstream load (300), starting an emergency working condition, judging whether the time for entering the emergency working condition is lower than a time threshold, and if yes, outputting a lithium battery power supply signal; if not, outputting an auxiliary energy power supply signal; the lithium battery power supply device (20) supplies power to the downstream load (300) according to the lithium battery power supply signal, and the solar power supply device (30), the wind power supply device (40) and the hydrogen power supply device (50) supply power to the downstream load (300) according to the auxiliary energy power supply signal.

7. The method for controlling an emergency power supply of a nuclear power plant according to claim 6, wherein the step S3 further includes a step S31: judging whether the sum of the power of the solar power supply device (30), the wind power supply device (40) and the hydrogen power supply device (50) exceeds the power required by the downstream load (300), and if so, outputting an emergency charging signal; the solar power supply device (30), the wind power supply device (40) and the hydrogen power supply device (50) charge the lithium battery power supply device (20) according to the emergency charging signal.

8. The method according to claim 6, wherein the step S2 further includes S21; judging whether the output power of the solar power supply device (30) and the wind power supply device (40) exceeds a power threshold value, and if so, outputting a cleaning charging signal; if not, outputting a mains supply charging signal; the solar power supply device (30) and the wind power supply device (40) charge the lithium battery power supply device (20) according to the cleaning charging signal; the utility power (200) charges the lithium battery power supply device (20) according to the utility power charging signal.

9. The emergency power supply control method according to any one of claims 6 to 8, wherein step S3 further includes S32: and judging whether the state of charge of the lithium battery power supply device (20) is lower than a state of charge threshold, and if so, outputting a lithium battery alarm signal.

10. The emergency power supply control method according to any one of claims 6 to 8, wherein step S3 further includes S33: and judging whether the hydrogen leakage data exceeds a safety threshold, and if so, outputting a hydrogen leakage alarm signal.

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