CN116565962B - Wind-solar heat storage integrated system and wide-load peak shaving operation method - Google Patents

Abstract

The application belongs to the technical field of wind-solar energy storage and multi-energy complementation, and discloses a wind-solar energy storage integrated system and a wide-load peak regulation operation method. The wind power and photovoltaic power generation system and the photo-thermal power generation system are coupled by the electric heater, redundant renewable power is converted into heat energy of molten salt by the electric heater for storage, and then the heat storage technology of multiple temperature areas is combined to form the wind-solar heat storage integrated system. The system can realize wide load rapid and flexible peak regulation, reduce the wind and light discarding phenomenon of the new energy power plant, increase the capacity of the power grid for absorbing new energy power and improve the running stability of the power grid.

Description

An integrated wind-solar heat storage system and wide-load peak-shaving operation method

Technical field

The invention belongs to the technical field of wind, solar and energy storage complementary technology, and relates to an integrated wind, solar and heat storage system and a wide-load peak-shaving operation method.

Background technique

There are two problems in the current power grid. First, the load distribution is unbalanced over time, and the peak and valley differences in power load are large, which can easily lead to unstable power grid operation. Second, the scale of renewable energy power grid integration is getting larger and larger, but wind energy, solar energy, etc. Renewable energy power generation has strong randomness and volatility. If its output characteristics are not controlled and directly connected to the power grid, it will have a huge impact on the power grid and affect the safe and stable operation of the power grid.

In order to increase the new energy consumption capacity of the power grid, coal-fired power plants are currently used to provide grid peak and frequency regulation services. However, the load factor of a coal-fired power station is limited by the evaporation capacity of its boiler and the flow rate of the steam turbine, which is often difficult to be lower than 30%. At the same time, the thermal power regulation peak emissions of atmospheric pollutants cause environmental problems.

Traditional wind power-photovoltaic complementary power plants take advantage of the strong complementarity of solar and wind energy resources to make up for the resource shortcomings of independent wind power and photovoltaic power generation systems to a certain extent, but they still cannot meet the current needs to ensure the stability of the power grid.

Therefore, in order to increase the renewable energy accommodation capacity of the power grid and reduce large-scale wind and light curtailment, it is urgent to optimize the design of renewable energy power stations to reduce their impact on the power grid.

Contents of the invention

In view of the problems in the existing technology that the peak shaving capacity of thermal power units is limited and renewable energy power generation cannot be fully absorbed, the purpose of the present invention is to provide an integrated wind and solar heat storage system and an operation method that use electric heaters to convert wind power into , the photovoltaic power generation system is coupled with the photothermal power generation system, and the excess electricity generated by wind power and photovoltaics is converted into the internal energy of molten salt using electric heaters and stored, achieving the purpose of peak shifting and valley filling. At the same time, it is based on multi-temperature zone storage. Thermal technology can increase the temperature range of the supercritical carbon dioxide Brayton cycle in the photothermal power generation system, thereby improving its cycle efficiency. The system can realize rapid and flexible peak regulation of wide loads, take advantage of the highly complementary characteristics of solar and wind energy resources, increase the power grid's ability to absorb new energy power, and reduce the abandonment of wind and light. It can also use the heat storage system to assist power grid regulation. peak and improve the stability of power grid operation.

The present invention is realized through the following technical solutions:

The first aspect of the present invention provides an integrated wind and solar heat storage system, including: a wind power generation system, a photovoltaic power generation system, a high temperature heat storage and release cycle system, a medium and low temperature heat storage and release cycle system, an electric heating system and a power cycle. system.

The wind power generation system includes: a wind power generation device, a frequency converter, and a wind farm transformer. The wind power generation device is connected to the power grid through the frequency converter and the wind farm transformer in sequence;

The photovoltaic power generation system includes: a photovoltaic power generation device, a photovoltaic inverter and a photovoltaic power plant transformer, and the photovoltaic power generation device is connected to the power grid through the photovoltaic inverter and the photovoltaic power plant transformer in sequence;

The high-temperature heat storage and release cycle system includes: molten salt tower collector mirror field, electric heating device, hot molten salt storage tank, molten salt-carbon dioxide heat exchanger, molten salt-thermal oil heat exchanger and cold molten salt storage tank. tank, the outlet of the cold molten salt storage tank is divided into two routes, one is connected to the hot molten salt storage tank through the first branch through the molten salt tower collector mirror field and the electric heating device, and the other is connected to the second branch Directly through the electric heating device, it is connected to the hot molten salt storage tank. The outlet of the hot molten salt storage tank is also divided into two routes. One is connected to the cold molten salt storage tank through the third branch via the molten salt-carbon dioxide heat exchanger. The fourth branch of the other route passes through the molten salt-thermal oil heat exchanger and is connected to the cold molten salt storage tank;

The medium and low-temperature heat storage and release circulation system includes: a thermal oil tank type heat collecting mirror field, a thermal oil storage tank, a thermal oil-carbon dioxide heat exchanger and a cold thermal oil storage tank. The outlet of the cold thermal oil storage tank is divided into two Road, one is connected to the thermal oil storage tank by the fifth branch through the thermal oil tank type collector mirror field, and the other is connected to the thermal oil storage tank by the sixth branch after passing through the molten salt-thermal oil heat exchanger. The outlet of the hot thermal oil storage tank is connected to the cold thermal oil storage tank through the thermal oil-carbon dioxide heat exchanger;

The electric heating system includes an electric heating device, and the output sides of the wind power generation device and the photovoltaic inverter are respectively connected to the electric heating device;

The power cycle system includes: turbine device, condenser, compressor and generator. The circulating working fluid passes through the compressor, thermal oil-carbon dioxide heat exchanger, molten salt-carbon dioxide heat exchanger, and turbine device in order to perform external work. , then returns to the compressor through the condenser, and is connected to the generator after the turbine installation.

Furthermore, the integrated wind-solar heat storage system described in the present invention also has the following characteristics:

The circulating working fluid in the high-temperature heat storage and release circulation system is molten salt. The molten salt is heated to 565 ^° C through the molten salt tower collector mirror field and the electric heating device, and then enters the hot molten salt storage tank. The hot molten salt is cooled to 280 ^o C in the molten salt-carbon dioxide heat exchanger and the molten salt-thermal oil heat exchanger and then returned to the cold molten salt storage tank.

The circulating working fluid in the medium and low temperature heat storage and release cycle system is heat transfer oil. The heat transfer oil is heated to 300 ^° C through the heat transfer oil tank type collector mirror field and the molten salt-heat transfer oil heat exchanger and then enters the heat transfer oil storage tank. The hot thermal oil in the thermal oil storage tank returns to the cold thermal oil storage tank after being cooled to 40 ^o C in the thermal oil-carbon dioxide heat exchanger.

The circulating working fluid in the power cycle system is supercritical carbon dioxide, the cycle form is supercritical carbon dioxide Brayton cycle, and the cycle temperature range is 35 ^o C ~ 550 ^o C.

The second aspect of the present invention is to provide a wide-load peak-shaving operation method for the above-mentioned integrated wind, solar and heat storage system. Wind power generation, photovoltaic power generation, and power cycle power generation are selected to participate in peak-shaving according to the power grid instructions. The specific control logic is as follows:

When the power grid requires the wind, solar and heat storage integrated system to increase the load, the wind power generation system and the photovoltaic power generation system are directly integrated into the power grid for load adjustment in the first minute. The high-temperature heat storage and release cycle system heats the molten salt, and the medium and low-temperature heat storage and release cycle The system heats the thermal oil; after 1 minute, all the electric energy generated by the wind power generation device and the photovoltaic inverter is used to heat the molten salt through the electric heating device, and the molten salt is heated simultaneously with the high-temperature heat storage and release circulation system to generate high-temperature molten salt in the hot molten salt storage tank. Salt, the medium and low temperature heat storage and release cycle system generates high-temperature heat transfer oil in the heat transfer oil storage tank. After the power cycle performs work, the generator is finally integrated into the power grid to participate in load adjustment;

When the power grid requires the integrated wind-solar heat storage system to reduce load, the flow of supercritical carbon dioxide in the power cycle system is rapidly reduced in the first 5 minutes, reducing the electrical energy output of the generator. The high-temperature heat storage and release cycle system heats the molten salt, and the medium-low temperature storage The exothermic circulation system heats the thermal oil; after 5 minutes, the electric energy generated by the wind power generation device and the photovoltaic inverter heats the molten salt through the electric heating device, and is finally stored in the hot molten salt storage tank. The excess energy passes through the molten salt-thermal oil heat exchanger and store the heat in a thermal oil storage tank.

Furthermore, the wide-load peak-shaving operation method of a wind-solar heat storage integrated system described in the present invention includes the following steps during night operation:

When the A1 system is running at night, the photovoltaic power generation device, molten salt tower collector mirror field, and thermal oil tank collector mirror field stop working, and other parts work normally;

A2 When the output power of the wind power generation device is excessive, the cold molten salt is heated by the electric heating device in the second branch and then stored in the hot molten salt storage tank;

A3 When the remaining capacity of the thermal oil in the hot thermal oil storage tank is insufficient, start the fourth branch and the sixth branch, and use the hot molten salt in the hot molten salt storage tank to heat the cold thermal oil from the cold thermal oil storage tank. , maintain the stable operation of the thermal oil-carbon dioxide heat exchanger;

Furthermore, the daytime operation of the wide-load peak-shaving operation method of an integrated wind, solar and thermal storage system includes the following steps:

When the B1 system operates with sufficient light during the day, the molten salt tower collector mirror field is started, and the cold molten salt in the cold molten salt storage tank is heated and sent to the hot molten salt storage tank. The cold heat transfer oil in the cold heat transfer oil storage tank is heated and sent to the hot heat transfer oil storage tank;

When the B2 system runs under insufficient light during the day, it uses excess wind power or photovoltaic power generation to drive the electric heating device to heat the cold molten salt in the cold molten salt storage tank and then sends it to the hot molten salt storage tank. If the hot molten salt storage tank has reached capacity upper limit, and the remaining capacity of the thermal oil in the thermal oil storage tank is insufficient, the fourth branch and the sixth branch are started, and the hot molten salt in the hot molten salt storage tank is used to process the cold thermal oil from the cold thermal oil storage tank. heating.

Furthermore, the wide-load peak-shaving operation method of an integrated wind-solar heat storage system described in the present invention can achieve a peak-shaving operation range of 5% to 120% of the rated design capacity.

The beneficial technical effects achieved by the present invention are as follows:

1. The present invention uses electric heaters to couple wind power, photovoltaic power generation systems and photothermal power generation systems, and uses the electric heater to convert the excess electricity generated by wind power and photovoltaics into the internal energy of molten salt and store it to achieve peak shifting. The effect of valley filling; based on multi-temperature zone heat storage technology, increase the temperature range of the supercritical carbon dioxide Brayton cycle in the photothermal power generation system, thereby improving its system cycle efficiency; reduce wind and light abandonment in renewable energy power plants, and increase the power grid's The consumption capacity of new energy power; using heat storage systems to assist power grid peak regulation and improve grid stability.

2. The present invention adopts an integrated wind-solar heat storage system, which can realize rapid and flexible peak shaving for a wide load, utilizes the strong complementarity of solar and wind energy resources, increases the power grid's ability to absorb new energy power, and reduces the phenomenon of wind and light abandonment. At the same time, the heat storage system can also be used to assist power grid peak regulation and improve the stability of power grid operation.

Description of the drawings

Figure 1 is a schematic diagram of the system structure provided by the present invention;

Figure 2 is a control flow chart of the system's wide-load peak-shaving operation provided by the present invention;

Figure 3 is a time-division operation control flow chart of the system provided by the present invention.

In the picture: 1 is the wind power generation device, 2 is the frequency converter, 3 is the wind farm transformer, 4 is the power grid, 5 is the photovoltaic power generation device, 6 is the photovoltaic inverter, 7 is the photovoltaic power plant transformer, and 8 is the molten salt tower concentrator. Hot mirror field, 9 is an electric heating device, 10 is a hot molten salt storage tank, 11 is a molten salt-carbon dioxide heat exchanger, 12 is a molten salt-thermal oil heat exchanger, 13 is a cold molten salt storage tank, and 14 is heat conduction Oil tank type collector mirror field, 15 is a hot thermal oil storage tank, 16 is a thermal oil-carbon dioxide heat exchanger, 17 is a cold thermal oil storage tank, 18 is a turbine device, 19 is a condenser, 20 is a compressor, 21 is the generator, 131 is the first branch, 132 is the second branch, 101 is the third branch, 102 is the fourth branch, 171 is the fifth branch, and 172 is the sixth branch.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings commonly understood by those of ordinary skill in the technical field to which this application belongs.

The terms “first” and “second” are used for descriptive purposes only and shall not be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the described features.

Referring to Figure 1, the integrated wind and solar heat storage system of the present invention includes: wind power generation system, photovoltaic power generation system, high temperature heat storage and release cycle system, medium and low temperature heat storage and release cycle system, electric heating system and power cycle system.

Among them, the wind power generation system includes: wind power generation device 1, frequency converter 2 and wind farm transformer 3. Wind power generation device 1 is connected to the power grid 4 through frequency converter 2 and wind farm transformer 3 in sequence, and generates electricity under the condition that the wind speed meets the power generation requirements. Internet access, while providing the electric energy required by the electric heating device 9 when there is a surplus.

Among them, the photovoltaic power generation system includes: photovoltaic power generation device 5, photovoltaic inverter 6 and photovoltaic power plant transformer 7. The photovoltaic power generation device 5 is connected to the power grid 4 through the photovoltaic inverter 6 and photovoltaic power plant transformer 7 in turn, and meets the power generation requirements under light conditions. Under the conditions of generating electricity, the electric energy required by the electric heating device 9 is provided when there is a surplus.

Among them, the high-temperature heat storage and release circulation system includes: molten salt tower collector mirror field 8, hot molten salt storage tank 10, molten salt-carbon dioxide heat exchanger 11, molten salt-thermal oil heat exchanger 12 and cold molten salt storage tank Can 13. The cold molten salt at the outlet of the cold molten salt storage tank 13 is divided into two routes. One route is routed through the first branch 131 and then enters the hot molten salt storage tank 10 after being heated by the molten salt tower collector mirror field 8 and the electric heating device 9. The second branch 132 of the route is directly heated by the electric heating device 9 and then enters the hot molten salt storage tank 10. The hot molten salt at the outlet of the hot molten salt storage tank 10 is also divided into two routes. One route of hot molten salt is passed through the third branch 101. The carbon dioxide is heated in the molten salt-carbon dioxide heat exchanger 11 and then returned to the cold molten salt storage tank 13. Another route of hot molten salt passes through the fourth branch 102 through the molten salt-heat transfer oil heat exchanger 12 to heat the heat transfer oil. Returning to the cold molten salt storage tank 13, the design temperature of the hot molten salt storage tank 10 is 565 ^o C, and the design temperature of the cold molten salt storage tank 13 is 280 ^o C.

Among them, the medium and low temperature heat storage and release circulation system includes: thermal oil tank type heat collecting mirror field 14, hot thermal oil storage tank 15, thermal oil-carbon dioxide heat exchanger 16 and cold thermal oil storage tank 17, cold thermal oil storage tank 17 outlet The cold heat transfer oil is divided into two paths, one goes through the fifth branch 171 and is heated by the heat transfer oil tank type collector mirror field 14 and then enters the thermal oil storage tank 15, and the other goes through the sixth branch 172 through the molten salt-heat transfer oil exchange After being heated by the heater 12, it enters the thermal oil storage tank 15. The thermal oil at the outlet of the thermal oil storage tank 15 heats the carbon dioxide through the thermal oil-carbon dioxide heat exchanger 16 and then returns to the cold thermal oil storage tank 17. The thermal oil is The design temperature of the storage tank 15 is 300 ^° C, and the design temperature of the cold heat transfer oil storage tank 17 is 40 ^° C.

Among them, the electric heating system includes: an electric heating device 9. The electric heating device 9 can provide electric energy from the wind power generation device 1 and the photovoltaic power generation device 5, but the DC power generated by the photovoltaic power generation device 5 needs to be converted into alternating current through the photovoltaic inverter 6. The electric heating device 9 provides electric energy. The function of the electric heating device 9 is to heat the molten salt when the heating temperature of the molten salt tower collector mirror field 8 is insufficient, so that its temperature reaches the design temperature of 565 ^° C;

Among them, the power cycle system includes: turbine device 18, condenser 19, compressor 20 and generator 21. The supercritical carbon dioxide passes through the compressor 20, the thermal oil-carbon dioxide heat exchanger 16, and the molten salt-carbon dioxide heat exchanger 11 in sequence. , the turbine device 18 performs work externally, and then returns to the compressor 20 through the condenser 19. The turbine device 18 is then connected to the generator 21. The cycle form of supercritical carbon dioxide is the Brayton cycle, and its cycle temperature range is 35 ^o C~550 ^o C.

Referring to Figure 2, the wide-load peak-shaving operation method of the integrated wind-solar heat storage system of the present invention can select wind power generation, photovoltaic power generation, and power cycle power generation to participate in peak-shaving according to the grid instructions. The specific control logic is as follows:

When the power grid requires the wind, solar and heat storage integrated system to increase the load, the wind power generation system and the photovoltaic power generation system are directly integrated into the power grid for load adjustment in the first minute. The high-temperature heat storage and release cycle system heats the molten salt, and the medium and low-temperature heat storage and release cycle The system heats the thermal oil; after 1 minute, all the electric energy generated by the wind power generation device 1 and the photovoltaic inverter 6 is used to heat the molten salt through the electric heating device 9, and the high-temperature heat storage and release circulation system simultaneously heats the molten salt to generate a hot molten salt storage tank 10 high-temperature molten salt, the medium-low temperature heat storage and release cycle system generates high-temperature heat transfer oil in the heat transfer oil storage tank 15. After the power cycle performs work, the generator 21 is finally integrated into the power grid to participate in load adjustment;

When the power grid requires the wind-solar heat storage integrated system to reduce the load, the supercritical carbon dioxide working fluid flow of the power cycle system is rapidly reduced in the first 5 minutes, reducing the electrical energy output of the generator 21. The high-temperature heat storage and release cycle system heats the molten salt, and the medium and low temperature The heat storage and release circulation system heats the thermal oil; after 5 minutes, the electric energy generated by the wind power generation device 1 and the photovoltaic inverter 6 is heated through the electric heating device 9 and finally stored in the hot molten salt storage tank 10. The excess energy is passed through The molten salt-thermal oil heat exchanger 12 is stored in the thermal oil storage tank 15 .

Referring to Figure 3, the wide-load peak-shaving operation method of the wind-solar heat storage integrated system of the present invention includes the following steps during night operation:

When the A1 system is running at night, the photovoltaic power generation device 5, the molten salt tower collector mirror field 8, and the thermal oil tank collector mirror field 14 stop working, and other parts work normally;

A2 When the output power of the wind power generation device 1 is excessive, the cold molten salt is heated by the second branch 132 through the electric heating device 9 and then stored in the hot molten salt storage tank 10;

A3 When the remaining capacity of the heat transfer oil in the hot heat transfer oil storage tank 15 is insufficient, the fourth branch 102 and the sixth branch 172 are started, and the hot molten salt in the hot molten salt storage tank 10 is used to react with the heat transfer oil from the cold heat transfer oil storage tank 17 The cold heat transfer oil is heated to maintain the stable operation of the heat transfer oil-carbon dioxide heat exchanger 16;

The daytime runtime includes the following steps:

When the B1 system is running during the day and there is sufficient light, the molten salt tower collector mirror field 8 is started, and the cold molten salt in the cold molten salt storage tank 13 is heated and then sent to the hot molten salt storage tank 10. The thermal oil tank collector mirror field 14 Start, heat the cold heat transfer oil from the cold heat transfer oil storage tank 17 and send it to the hot heat transfer oil storage tank 15;

When the B2 system runs under insufficient light during the day, it uses excess wind power or photovoltaic power generation to drive the electric heating device 9 to heat the cold molten salt in the cold molten salt storage tank 13 and then sends it to the hot molten salt storage tank 10. If the hot molten salt storage tank 10 has reached the upper capacity limit, and the remaining capacity of the thermal oil in the thermal oil storage tank 15 is insufficient, the fourth branch 102 and the sixth branch 172 are started to use the hot molten salt in the hot molten salt storage tank 10 to conduct heat from the cold The cold heat transfer oil in the oil storage tank 17 is heated and then sent to the hot heat transfer oil storage tank 15 .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (1)

1. A wide load peak regulation operation method of a wind-solar heat storage integrated system is characterized in that the system comprises the following steps:

a wind power generation system, the wind power generation system comprising: the wind power generation device (1), the frequency converter (2) and the wind farm transformer (3), wherein the wind power generation device (1) is connected with the power grid (4) through the frequency converter (2) and the wind farm transformer (3) in sequence;

a photovoltaic power generation system, the photovoltaic power generation system comprising: the photovoltaic power generation device (5), the photovoltaic inverter (6) and the photovoltaic power plant transformer (7), wherein the photovoltaic power generation device (5) is connected with the power grid (4) through the photovoltaic inverter (6) and the photovoltaic power plant transformer (7) in sequence;

a high temperature heat storage and release circulation system, the high temperature heat storage and release circulation system comprising: the fused salt tower type heat collection mirror field (8), the electric heating device (9), the hot fused salt storage tank (10), the fused salt-carbon dioxide heat exchanger (11), the fused salt-heat conduction oil heat exchanger (12) and the cold fused salt storage tank (13), the outlet of the cold fused salt storage tank (13) is divided into two paths, one path is connected with the hot fused salt storage tank (10) after passing through the fused salt tower type heat collection mirror field (8) and the electric heating device (9), the other path is connected with the hot fused salt storage tank (10) after passing through the electric heating device (9) directly, the outlet of the hot fused salt storage tank (10) is divided into two paths, one path is connected with the cold fused salt storage tank (13) after passing through the fused salt-carbon dioxide heat exchanger (11), and the other path is connected with the cold fused salt storage tank (13) after passing through the fused salt-heat conduction oil heat exchanger (12) by the fourth path (102);

a medium-low temperature heat storage and release circulation system, the medium-low temperature heat storage and release circulation system comprising: the device comprises a heat conduction oil groove type heat collection mirror field (14), a heat conduction oil storage tank (15), a heat conduction oil-carbon dioxide heat exchanger (16) and a cold heat conduction oil storage tank (17), wherein an outlet of the cold heat conduction oil storage tank (17) is split into two paths, one path is connected with the heat conduction oil storage tank (15) after passing through the heat conduction oil groove type heat collection mirror field (14), the other path is connected with the heat conduction oil storage tank (15) after passing through a molten salt-heat conduction oil heat exchanger (12), and an outlet of the heat conduction oil storage tank (15) is connected with the cold heat conduction oil storage tank (17) after passing through the heat conduction oil-carbon dioxide heat exchanger (16);

the electric heating system comprises an electric heating device (9), and the output sides of the wind power generation device (1) and the photovoltaic inverter (6) are respectively connected with the electric heating device (9);

a power cycle system, the power cycle system comprising: the turbine device (18), the condenser (19), the compressor (20) and the generator (21), the circulating working medium sequentially passes through the compressor (20), the heat conduction oil-carbon dioxide heat exchanger (16), the molten salt-carbon dioxide heat exchanger (11) and the turbine device (18) to apply work to the outside, then returns to the compressor (20) through the condenser (19), and the turbine device (18) is connected with the generator (21);

the internal circulation working medium of the high-temperature heat storage and release circulation system is molten salt, and the molten salt is heated to 565 through a molten salt tower type heat collection mirror field (8) and an electric heating device (9) ^o C, entering a hot molten salt storage tank (10), wherein the hot molten salt storage tank is @10 The hot molten salt in the molten salt-carbon dioxide heat exchanger (11) and the molten salt-heat conducting oil heat exchanger (12) is cooled to 280 ^o Returning to the cold melting salt storage tank (13) after C;

the medium-low temperature heat storage and release circulation system adopts heat conduction oil as a working medium, and the heat conduction oil is heated to 300 through a heat conduction oil groove type heat collection mirror field (14) and a fused salt-heat conduction oil heat exchanger (12) ^o C, entering a heat conduction oil storage tank (15), and cooling the heat conduction oil in the heat conduction oil storage tank (15) to 40 in a heat conduction oil-carbon dioxide heat exchanger (16) ^o Returning to the cold heat conduction oil storage tank (17) after C;

the power circulation system adopts supercritical carbon dioxide as a working medium, the circulation mode is supercritical carbon dioxide Brayton circulation, and the circulation temperature range is 35 ^o C~550 ^o C；

According to the power grid dispatching instruction, orderly invoking wind power generation, photovoltaic power generation and power cycle power generation to participate in power grid peak shaving, wherein the specific control logic is as follows:

when the power grid requires the wind, light and heat storage integrated system to lift load, the wind power generation system and the photovoltaic power generation system are directly combined into the power grid in the first 1 minute, so that the rapid load adjustment capability is provided, meanwhile, the high-temperature heat storage and release circulating system heats molten salt, and the medium-low-temperature heat storage and release circulating system heats heat conduction oil, so that the load adjustment capability of the system is further improved; after 1 minute, electric energy generated by the wind power generation device (1) and the photovoltaic inverter (6) is heated by the electric heating device (9) to heat molten salt, the electric energy and the high-temperature heat storage and release circulating system are used for heating the molten salt at the same time to generate high-temperature molten salt of the heat molten salt storage tank (10), the medium-low-temperature heat storage and release circulating system is used for generating high-temperature heat conduction oil of the heat conduction oil storage tank (15), the electric power is used for doing work through power circulation, and the electric generator (21) is finally integrated into a power grid to participate in load lifting adjustment;

when the power grid requires the wind, light and heat storage integrated system to reduce load, the supercritical carbon dioxide working medium flow of the power circulation system is rapidly reduced in the first 5 minutes, the electric energy output of the generator (21) is reduced, the high-temperature heat storage and release circulation system heats molten salt, and the medium-low temperature heat storage and release circulation system heats heat conducting oil; after 5 minutes, electric energy generated by the wind power generation device (1) and the photovoltaic inverter (6) is heated by an electric heating device (9) to form molten salt, the molten salt is finally stored in a hot molten salt storage tank (10), and redundant energy is stored in a heat conduction oil storage tank (15) through a molten salt-heat conduction oil heat exchanger (12);

the system operates at night and comprises the following steps:

a1, stopping working of the photovoltaic power generation device (5), the fused salt tower type heat collecting mirror field (8) and the heat conduction oil groove type heat collecting mirror field (14), and normally working the other parts;

a2, when the output power of the wind power generation device (1) is excessive, the cold molten salt is heated by the second branch (132) through the electric heating device (9) and then stored into the hot molten salt storage tank (10);

a3, when the residual capacity of the heat conduction oil in the heat conduction oil storage tank (15) is insufficient, starting the fourth branch (102) and the sixth branch (172), and heating the cold heat conduction oil from the cold heat conduction oil storage tank (17) by using the hot molten salt in the hot molten salt storage tank (10) so as to maintain the stable operation of the heat conduction oil-carbon dioxide heat exchanger (16);

the daytime running of the system comprises the following steps:

when the daytime running illumination of the B1 system is sufficient, the fused salt tower type heat collecting mirror field (8) is started, cold molten salt of the cold molten salt storage tank (13) is heated and then is sent to the hot fused salt storage tank (10), the heat conducting oil tank type heat collecting mirror field (14) is started, and cold heat conducting oil from the cold heat conducting oil storage tank (17) is heated and then is sent to the heat conducting oil storage tank (15);

when the daytime running illumination of the B2 system is insufficient, using excessive wind power or photovoltaic power generation to drive an electric heating device (9) to heat cold molten salt in a cold molten salt storage tank (13) and then sending the cold molten salt to a hot molten salt storage tank (10), if the hot molten salt storage tank (10) reaches the upper limit of capacity and the residual capacity of heat conducting oil in a heat conducting oil storage tank (15) is insufficient, starting a fourth branch (102) and a sixth branch (172), heating cold heat conducting oil from a cold heat conducting oil storage tank (17) by using the hot molten salt in the hot molten salt storage tank (10), and then sending the cold heat conducting oil to the heat conducting oil storage tank (15);

the peak regulation operation interval can be realized as follows: 5% -120% of rated design capacity.