CN212849879U - Composite energy storage power supply system for power grid peak regulation and frequency modulation - Google Patents
Composite energy storage power supply system for power grid peak regulation and frequency modulation Download PDFInfo
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Abstract
The utility model provides a composite energy storage power supply system for peak shaving and frequency modulation of a power grid, which comprises a renewable energy power generation device; the first input end of the battery energy storage device is connected with the power output end of the renewable energy power generation device through the DC/DC converter; the power output end of the battery energy storage device is connected with the public alternating current bus through the first DC/AC converter; the power output end of the renewable energy power generation device is connected with the public alternating current bus through the second DC/AC converter; the power output end of the solar thermal power generation device is connected with the public alternating current bus through an AC/AC converter; and the heat storage device is connected with the solar thermal power generation device and can store heat and release heat with the solar power generation device. The utility model provides a stability, reliability, economic nature and feature of environmental protection can be compromise when compound energy storage power supply system is used for electric wire netting peak shaving frequency modulation.
Description
Technical Field
The utility model relates to a renewable energy source power generation field, in particular to composite energy storage power supply system for electric wire netting peak shaving frequency modulation.
Background
Renewable energy sources such as wind power and photovoltaic power generation have the characteristics of volatility, randomness, non-schedulability and the like, so that the power generation has certain influence on the safe and stable operation of a power grid, the phenomenon of wind and light abandonment is increasingly prominent, and the economic benefit is seriously influenced. At present, the fluctuation can be stabilized to a certain extent by using a traditional thermal power generating unit to carry out peak regulation and frequency modulation, but the installed capacity of renewable energy is continuously increased along with the gradual reduction of thermal power occupation, the requirement of peak regulation and frequency modulation cannot be met only by using the thermal power generating unit, and the service life of the thermal power generating unit can be greatly influenced by the participation of the thermal power generating unit in frequency modulation. The large-scale energy storage technology can store the redundant energy and release the redundant energy when needed, has the characteristics of good dynamic response characteristic, long service life, high reliability and the like, can improve the power generation output quality of renewable energy sources such as wind power, photovoltaic and the like, solves the problem of wind and light abandonment, and improves the economy of a power grid.
At present, the energy storage technology which can be used for peak shaving and frequency modulation of a power grid comprises pumped storage, compressed air storage, electrochemical energy storage, heat storage and the like, and for a single energy storage mode, in the electrochemical energy storage, the battery energy storage response speed is high, so that the method is suitable for stabilizing rapid output fluctuation in a short time range, and because the battery system is expensive and the high-capacity battery system is higher in operation and maintenance cost, the method is not suitable for stabilizing large-range output fluctuation. Pumped storage, compressed air storage and molten salt storage are suitable for large-scale energy storage, but the pumped storage has high requirement on site selection; the development difficulty of large and ultra-large key equipment for compressed air energy storage is large. The heat storage has the advantages of large capacity, environmental friendliness, high safety, simple site selection, power grid friendliness, obvious energy storage benefit and the like, the heat storage cost is further reduced along with the increase of the heat storage capacity, the response speed of the heat storage is slower than that of battery energy storage, and the heat storage device is suitable for stabilizing large-amplitude fluctuation in a longer time range.
The Chinese patent document with the publication number of CN108173274A entitled multi-element energy storage peak-and-frequency modulation system based on a pumped storage power station and a hydropower station discloses a multi-element energy storage peak-and-frequency modulation system based on a pumped storage power station and a hydropower station, which comprises a hydroelectric generation module, wherein the hydroelectric generation module is respectively connected with the input end of a main transformer, a transformer III and an alternating current switching device through leads, the output end of the main transformer is connected with a power grid, the transformer III is connected with a flywheel energy storage group module, the alternating current switching device is connected with a transformer IV, the transformer IV is connected with a battery energy storage group module, and the hydroelectric generation module, the flywheel energy storage group module and the battery energy storage group module are all connected with a peak-and-. The peak-shaving frequency modulation system disclosed by the Chinese patent document adopts pumped storage, and has higher requirement on address selection environment, higher cost, lower safety and poorer stability.
Therefore, there is a need for an improvement of the existing energy storage technology for peak shaving and frequency modulation of the power grid.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a compound energy storage power supply system for electric wire netting peak shaving frequency modulation.
This a compound energy storage power supply system for grid peak regulation frequency modulation includes:
a renewable energy power generation device;
a first input end of the battery energy storage device is connected with a power supply output end of the renewable energy power generation device through a DC/DC converter;
the power output end of the battery energy storage device is connected with a public alternating current bus through the first DC/AC converter;
a second DC/AC converter, through which a power output terminal of the renewable energy power generation device is connected to the common AC bus;
the power output end of the solar thermal power generation device is connected with the public alternating current bus through an AC/AC converter;
and the heat storage device is connected with the solar thermal power generation device and can store heat and release heat with the solar power generation device.
Preferably, the battery energy storage device further comprises a second input end of the battery energy storage device, and the second input end of the battery energy storage device is connected with the power output end of the solar thermal power generation device through an AC/DC converter.
Preferably, the central management device is connected to the external grid dispatching system in a communication manner, a first input end and a second input end of the central management device are respectively connected to an output end of the first DC/AC converter and an output end of the second DC/AC converter, and an output end of the central management device is connected to the common alternating current bus.
Preferably, the renewable energy power generation device includes any one of a wind power generation system, a solar photovoltaic power generation system, a solar thermal power generation device, and other renewable energy power generation devices with fluctuating output.
Preferably, the solar thermal power generation device is a power generation device that converts thermal energy into electric energy.
Preferably, the local coordination processing controller is in communication connection with the battery energy storage device, the heat storage device and the central management device respectively, and can receive an instruction from the central management device, and optimize the output of the battery energy storage device and the heat storage device according to the instruction and the charge states of the battery energy storage device and the heat storage device.
Preferably, the environment/load prediction device is connected to the central management device in a communication manner, generates prediction data including an external environment and a load change of the ac bus, and transmits the prediction data to the central management device.
Preferably, the battery energy storage device further comprises:
an energy module comprising a heat dissipation, measurement and signal circuit to provide energy storage;
the control module is used for providing a communication interface with the outside, monitoring the states of the energy module and the PCS, scheduling the setting of charge and discharge power according to an instruction from the local coordination processing controller and controlling the operation of the battery energy storage device;
and the power module responds to the instruction generated by the control module, controls the charging and discharging actions of the energy module and provides a grid-connected interface of the composite energy storage power supply system.
Preferably, the hybrid energy storage power supply system further includes:
the inlet end of the electric energy conversion device is connected with the power output end of the renewable energy power generation device, and the outlet end of the electric energy conversion device is connected with the heat storage device and used for converting the electric energy generated by the renewable energy power generation device into the heat energy stored by the heat storage device.
Preferably, the heat storage device includes:
the heat storage device comprises at least one tank body, wherein a plurality of heat storage units can be contained in the tank body, and heat storage working mediums are contained in the heat storage units;
and the bypass control system can connect the heat storage unit working medium outlet and the heat storage unit working medium inlet in a bypass manner and is used for stabilizing the outlet state of the heat storage working medium.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. through setting up battery energy memory and heat-retaining device, the compound energy storage power supply system of constitution can be to renewable energy power generation system real-time peak regulation frequency modulation, and battery energy memory response is quick, can stabilize the rapid fluctuation in the renewable energy power generation system short time, and heat-retaining device is capacious, can stabilize the fluctuation by a wide margin in the renewable energy power generation system long time. Meanwhile, the battery energy storage device can also stabilize rapid fluctuation within a short time exceeding the regulation range of the heat storage device, optimize the output targets of battery energy storage and heat storage, enable the composite energy storage system to work within a reasonable range, and stabilize the output of the local renewable energy power generation system and the output of other renewable energy power generation systems in the local area network.
2. By arranging the solar thermal power generation device and the heat storage device, when solar energy fluctuates and is unstable, the heat storage device can provide a stable heat source for the solar thermal power generation device; when the solar energy is excessive, the redundant heat is stored in the heat storage device, and the utilization rate of the energy is improved.
3. The renewable energy power generation device is matched with the battery energy storage system, and the battery energy storage system stabilizes the power generation fluctuation of the renewable energy power generation device through the charging and discharging process; the renewable energy power generation device is matched with the heat storage device, and the surplus electric energy which is generated by the renewable energy power generation system and cannot be subjected to grid-connected power generation is converted into heat energy through the electric heat conversion device to be stored in the heat storage device, so that the stability of system operation is improved, the energy is saved, and the energy utilization rate is improved.
Drawings
Fig. 1 is a schematic structural diagram of the composite energy storage power supply system for peak shaving and frequency modulation of a power grid according to the present invention;
fig. 2 is a schematic structural diagram of the thermochemical heat storage device of the composite energy storage power supply system for peak shaving and frequency modulation of the power grid based on the tower type solar brayton cycle gas turbine power generation system of the present invention;
fig. 3 is a schematic structural diagram of a tower-type solar brayton cycle gas turbine power generation system-based heat storage device bypass control system of the composite energy storage power supply system for power grid peak shaving frequency modulation of the present invention;
fig. 4 is the structure schematic diagram of the utility model discloses a compound energy storage power supply system for electric wire netting peak regulation frequency modulation adopts wind power generation system, solar photovoltaic power generation system and tower solar brayton cycle gas turbine power generation system when.
Description of the reference numerals
A renewable energy power generation device 1; a battery energy storage device 2; a heat storage device 3; a local coordination processing controller 5; an environment/load prediction device 6; a first input 7 of the battery energy storage means; a DC/DC converter 8; a first DC/AC converter 9; a common ac bus 10; a second DC/AC converter 11; a solar thermal power generation device 12; an AC/AC converter 13; a second input 14 of the battery energy storage device; an AC/DC converter 15; an electrothermal conversion device 16; an air inlet 17; an air outlet 18; an electric heater 19; a central management device 20; a power grid 21; an electric brake 22; a heat storage unit 23; a bypass control system 24; a bypass 25; a valve 26; a wind power generation system 27; a solar photovoltaic power generation system 28; a mirror field 29; an air heat absorber 30; a bypass valve 32; a regenerator 33; a compressor 34; a turbine 35; a generator 36; a waste heat utilization device 37; an AC/AC converter 38; a tower solar Brayton cycle gas turbine power generation system 39; a DC/AC converter 40.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a composite energy storage power supply system for peak shaving and frequency modulation of a power grid, which comprises a renewable energy power generation device 1, a battery energy storage device 2, a heat storage device 3 and a central management device 20; the solar heat power generation system comprises a battery energy storage device, a first input end 7 of the battery energy storage device is connected with a power output end of a renewable energy power generation device 1 through a DC/DC converter 8, the power output end of the battery energy storage device 1 is connected with a public alternating current bus 10 through a first DC/AC converter 9, the power output end of the renewable energy power generation device 1 is connected with the public alternating current bus 10 through a second DC/AC converter 11, the solar heat power generation device 12 is further included, the power output end of the solar heat power generation device 12 is connected with the public alternating current bus 10 through an AC/AC converter 13, and a heat storage device 3 is connected with the solar heat power generation device 12 and can store heat and release heat with the solar heat. The utility model provides a compound energy storage power supply system for electric wire netting peak regulation frequency modulation couples battery energy storage device 2 and heat-retaining device 3, uses the compound energy storage power supply system that comprises battery energy storage device 2 and heat-retaining device 3 to coordinate and handle the regulation and control, to renewable energy power generation set 1 peak regulation frequency modulation in real time, specifically speaking, battery energy storage device 2 responds fast, mainly calms the rapid fluctuation of renewable energy power generation set 1 in short time, heat-retaining device 3 is capacious, mainly used for calm the great wave motion of renewable energy power generation set 1 in longer time, simultaneously can also promote solar thermal energy power generation set to generate electricity and supply battery energy storage device through releasing heat, calm the rapid fluctuation of heat-retaining device 3 in short time of control range, optimize the output target of battery energy storage device 2 and heat-retaining device 3, make compound energy storage system work in reasonable scope, and stabilizing the output of the local renewable energy power generation device 1 and the output of other renewable energy power generation systems in the local area network. The regulation and control system combines the characteristics of large capacity of the heat storage device, quick response of the battery energy storage device and accurate and reliable regulation, reduces the occupation of expensive battery capacity in the battery energy storage device, saves the cost and improves the economy.
As a preferred embodiment of the present invention, the renewable energy power generation apparatus 1 includes any one of a wind power generation system, a solar light power generation system, a solar thermal power generation apparatus, and other renewable energy power generation apparatuses whose output fluctuates, the battery energy storage apparatus 2 further includes a second input end 14 of the battery energy storage apparatus, the second input end 14 of the battery energy storage apparatus is connected to a power output end of the solar thermal power generation apparatus 12 through an AC/DC converter 15, the solar thermal power generation apparatus 12 is matched with the heat storage apparatus 3, when the solar energy fluctuates and is unstable, the heat storage apparatus 3 can provide a stable heat source for the solar thermal power generation apparatus 12, and when the solar energy is excessive, the excessive heat is stored in the heat storage apparatus 3; renewable energy power generation systems such as wind power generation system, solar photovoltaic power generation system, with battery energy memory 2 cooperatees, and battery energy memory 2 stabilizes renewable energy power generation systems such as wind power generation system, solar photovoltaic power generation system through the charge-discharge process and generates electricity undulant, with heat-retaining device 3 cooperation, the surplus electric energy that can't be incorporated into the power networks the electricity generation that renewable energy power generation systems such as wind power generation system, solar photovoltaic power generation system produced through electric heat conversion device 16 turns into heat energy storage in heat-retaining device 3. When the allowance of the battery energy storage device 2 is not enough to stabilize rapid fluctuation in a short time, the heat storage device 3 releases heat to push the solar thermal power generation device 12 to generate electricity, and part of the electric energy is used for charging the battery energy storage device 2 through the AC/DC converter 15 until the battery energy storage device 2 is enough to stabilize rapid fluctuation in a short time.
As a preferred embodiment of the present invention, the system further includes a central management device 20, the central management device 20 is in communication connection with an external power grid dispatching system, the first input end and the second input end of the central management device 20 are respectively connected to the output end of the first DC/AC converter 9 and the output end of the second DC/AC converter 11, the output end of the central management device 20 is connected to the public AC bus 10, and the central management device 20 can synthesize various information and give a peak-shaving frequency-modulation command.
As a preferred embodiment of the present invention, the present invention further includes a local coordination processing controller 5, the local coordination processing controller 5 and the battery energy storage device 2 and the heat storage device 3 and the central management device 20 are connected in communication respectively, the local coordination processing controller 5 can receive the instruction from the central management device 20, and the local coordination processing controller 5 can optimize the processing of the battery energy storage device 2 and the heat storage device 3 according to the instruction and the battery energy storage device 2 and the state of charge of the heat storage device 3.
As a preferred embodiment of the present invention, still include environment/load prediction device 6, environment/load prediction device 6 synthesizes weather conditions, power consumption demand and time quantum, light in some regional period of prediction, the amount of wind and the change of alternating current load, and then the prediction electrovalence changes and feeds back to central management device 20, central management device 20 still receives and comes from electric wire netting peak shaving frequency modulation demand and local photovoltaic power generation and light and heat power generation state information, synthesize above-mentioned information after form dispatching command and send local coordination processing controller 5, battery energy storage device 2 and heat-retaining device 3 are handled according to the instruction is in coordination, accomplish peak shaving frequency modulation process. Meanwhile, the central management device 20 will actively report the peak-load and frequency-modulation capability of the local composite energy storage system to the power grid dispatching center, and stabilize the power output of the local area network.
As a preferred embodiment, the battery energy storage device 2 comprises an energy module to provide energy storage capability, including heat dissipation, measurement and signal circuitry inside the energy storage unit; and the power module responds to the command of the communication and control unit and controls the charging and discharging actions of the battery energy storage unit. Meanwhile, a grid-connected interface of the battery energy storage device 2 is provided, so that the requirements on grid-connected electric energy quality, power grid adaptability and fault protection function are met; and the control module is used for providing a communication interface with a local area network and a power grid, monitoring the states of the energy storage unit and the PCS, scheduling the charge and discharge power setting of the battery energy storage device 2 according to the instruction of the local coordination processing controller 5, and controlling the operation of the battery energy storage device 2.
As fig. 2 does the utility model provides a pair of a composite energy storage power supply system for electric wire netting peak shaver frequency modulation is based on tower solar energy brayton cycle gas turbine power generation system thermochemical heat-retaining device's structural schematic diagram, including air inlet 17, gas outlet 18, electric heater 19 and heat-retaining unit 23, the utility model provides a when composite energy storage power supply system cooperates with tower solar energy brayton cycle gas turbine power generation system, electric heat conversion equipment adopts electric heater 19, air inlet 17 set up in jar body top, gas outlet 18 set up in jar body bottom, a plurality of heat-retaining units 23 of internal portion of jar distribute adopt thermochemical heat-retaining unit.
As a preferred embodiment, the local area network may be provided with a plurality of heat storage tanks according to actual requirements; the electric heating device converts redundant electric energy in the renewable energy power generation device 1 into heat energy and stores the heat energy in the heat storage device 3; because the density of the hot gas is less than that of the normal temperature gas, the gas heated by the buoyancy is easy to flow upwards, and the hot gas is gradually and uniformly filled in the tank body from top to bottom by adopting the arrangement mode that the gas inlet 17 is arranged at the top of the tank body and the gas outlet 18 is arranged at the bottom of the tank body. Thermochemical heat storage is the heat storage mode with the largest heat storage density at present, seasonal long-term storage and long-distance transportation can be realized, and the grade of heat energy can be improved.
In a preferred embodiment, when the heat storage device 3 is incorporated in a tower-type solar brayton cycle gas turbine power generation system, the medium flowing into the tank through the air inlet 17 is air, and the thermochemical heat storage medium is a metal oxide. Compared with other heat storage devices, the metal oxide heat storage device has the advantages that the heat loss generated by heat exchange with the heat storage device is reduced, the heat storage efficiency is higher, the metal oxide redox reaction has better circulation stability, the better reaction dynamic characteristic and structural stability can be kept after multiple circulations, and the long-time stable operation can be kept after the metal oxide heat storage device is initially put into use.
As a preferred embodiment, as fig. 3 does the utility model provides a pair of a compound energy storage power supply system for electric wire netting peak shaver frequency modulation still includes bypass control system 24 based on tower solar energy brayton cycle gas turbine power generation system heat-retaining device bypass control system's structural schematic, and bypass control system 24 still includes bypass 25 and valve 26, and bypass control system 24 can export heat-retaining unit 23 working medium and heat-retaining unit 23 working medium import bypass connection for stabilize the exit state of heat-retaining unit 23 working medium. In the bypass control system 24, the temperature of the air at the outlet of the heat storage tank is controlled and kept stable by changing the opening degree of the bypass valve 26 so as to meet the requirement of the gas turbine. When the heat storage tank stores heat, the opening degree of the valve 26 is reduced, high-temperature air mainly flows through the heat storage tank, and the heat energy of the high-temperature air is converted into chemical energy through chemical reaction and stored in a heat storage medium; after the storage tank is full of heat, the opening of the valve 26 is increased, and high-temperature air mainly flows to the downstream through a bypass except that part of hot air is used for maintaining the temperature and the state of the storage tank to be stable.
As shown in fig. 4 is a pair of a composite energy storage power supply system for power grid peak regulation and frequency modulation adopts wind power generation system, solar photovoltaic power generation system and tower solar brayton cycle gas turbine power generation system's time-structure schematic diagram, this system is used for stabilizing local power generation system output, and renewable energy power generation device includes wind power generation system 27, solar photovoltaic power generation system 28, tower solar brayton cycle gas turbine power generation system 39. The battery energy storage device 2 and the heat storage device 3 are coupled, when the output of the power generation system fluctuates and cannot meet the grid-connected power generation requirement, the central management device 20 collects signals and generates a scheduling instruction, and after the local coordination processing controller 5 receives the scheduling instruction, the battery energy storage device 2 and the heat storage device 3 cooperatively adjust the charging, discharging and heat storing processes, so that peak regulation and frequency modulation are realized, and the power generation output of the system is stabilized. The tower solar energy brayton cycle gas turbine power generation system includes: a mirror field 29, an air heat absorber 30, a heat storage device 3, a bypass valve 32, a heat regenerator 33, a compressor 34, a turbine 35, a generator 36, a waste heat utilization device 37 and an AC/AC converter 38, the method comprises the steps that ambient air is boosted by an air compressor and enters a heat regenerator 33 to be preheated, the preheated air enters an air heat absorber 30 to be heated by focusing sunlight of a heliostat field 29, the heated high-temperature air enters a heat storage device 3, the heat storage device 3 absorbs heat according to the operation condition of a system, if the air temperature is higher than the stable operation air temperature of a gas turbine at the moment, the heat storage device 3 absorbs redundant heat, if the air temperature is lower than the stable operation air temperature of the gas turbine at the moment, the heat storage device 3 releases heat, the temperature of the air at the outlet of the heat storage device 3 is maintained to be stable, the stable high-temperature air enters a turbine to expand to do work, turbine exhaust is. Turbine 35 drives a generator to generate electricity, which is connected to common AC bus 10 via AC/AC inverter 38. The wind power generation system 27, the solar photovoltaic power generation system 28 and the battery energy storage device 2 are connected with a direct current bus through a DC/DC converter 8, the direct current bus is connected with an alternating current bus 10 through a DC/AC converter 40, the alternating current bus 10 is connected with a power grid and can be directly connected with an alternating current load, and meanwhile, the direct current bus is also connected with an electric heating device in the heat storage device 3. When the output of the wind power generation system 27 or the solar photovoltaic power generation system 28 is higher than the expected value, the redundant electric energy is stored in the battery energy storage device or the electric heating device is used for converting the electric energy into heat energy to be stored in the heat storage device 3, and when the output of the wind power generation system 27 or the solar photovoltaic power generation system 28 is lower than the expected value, the battery energy storage device 2 discharges to stabilize the output of the solar photovoltaic power generation system to be insufficient or the heat storage device 3 releases heat to promote the output of the tower type solar Brayton cycle gas turbine power generation system to stabilize the output of the wind power generation system 27 or the solar photovoltaic power generation system. When the allowance of the battery energy storage device 2 is not enough to stabilize the rapid fluctuation within a short time, the heat storage device 3 releases heat to push the solar thermal power generation device 12 to generate power, and part of the electric energy is charged for the battery energy storage device through the AC/DC converter 15 until the battery energy storage device is enough to stabilize the rapid fluctuation within a short time of local output.
As a preferred implementation mode, the utility model provides a pair of compound energy storage power supply system for electric wire netting peak shaving frequency modulation is used for stabilizing power generation system output, and especially this system is used for stabilizing other renewable energy power generation system output in the LAN. When the local wind power generation system 27, the photovoltaic power generation system 28 and the tower-type solar Brayton cycle gas turbine power generation system output is stable, and the output of other renewable energy power generation devices in the local area network is unstable, the central management device 20 in the composite energy storage system for power grid peak regulation and frequency modulation receives a scheduling instruction from the local area network and sends the scheduling instruction to the local coordination controller 5, and the battery energy storage device 2 and the heat storage device 3 stabilize the energy storage margin after the fluctuation of the local power generation system to cooperatively regulate the charging, discharging and heat releasing processes, so that the peak regulation and frequency modulation of the local area network and the output of other renewable energy power generation systems in the stable area network are realized.
As a preferred embodiment, the utility model provides a compound energy storage power supply system for electric wire netting peak shaver frequency modulation for stabilize other renewable energy power generation system output in the LAN, this system except receiving LAN peak shaver frequency modulation instruction, central management device 20 still can initiatively apply for participating in the peak shaver frequency modulation to the LAN when compound energy storage system surplus is sufficient. When the output of the wind power generation system, the photovoltaic power generation system and the tower type solar Brayton cycle gas turbine power generation system is stable, the environment/load prediction device 6 predicts that the illumination is sufficient in the next period of time, the composite energy storage system is continuously in a relatively saturated state, the illumination and the air volume of other renewable energy power generation systems in the local area network are predicted to fluctuate, the environment/load prediction device 6 feeds back the state of the composite energy storage system to the central management device 20, the central management device 20 provides the peak and frequency modulation capability to the local area network scheduling center, the local area network scheduling center receives the peak and frequency modulation capability of the local composite energy storage system, sends a scheduling instruction to the central management device 20 in the composite energy storage system for the peak and frequency modulation of the power grid, and under the action of the local coordination processing controller 5, the energy storage allowance of the battery energy storage device 2 and the heat storage device 3 after the local power generation system fluctuates is stabilized to cooperatively adjust, therefore, the active peak regulation and frequency modulation of the local area network are realized, and the output of other renewable energy power generation systems in the local area network is stabilized.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A compound energy storage power supply system for power grid peak shaving frequency modulation, characterized by comprising:
a renewable energy power generation device;
a first input end of the battery energy storage device is connected with a power supply output end of the renewable energy power generation device through a DC/DC converter;
the power output end of the battery energy storage device is connected with a public alternating current bus through the first DC/AC converter;
a second DC/AC converter, through which a power output terminal of the renewable energy power generation device is connected to the common AC bus;
the power output end of the solar thermal power generation device is connected with the public alternating current bus through an AC/AC converter;
and the heat storage device is connected with the solar thermal power generation device and can store heat and release heat with the solar power generation device.
2. The composite energy storage and power supply system according to claim 1, wherein:
the battery energy storage device also comprises a second input end of the battery energy storage device, and the second input end of the battery energy storage device is connected with the power output end of the solar thermal power generation device through an AC/DC converter.
3. The composite energy storage power supply system according to claim 2, further comprising:
the first input end and the second input end of the central management device are respectively connected with the output end of the first DC/AC converter and the output end of the second DC/AC converter, and the output end of the central management device is connected with the public alternating current bus.
4. The composite energy storage and power supply system according to any one of claims 1 to 3, characterized in that:
the renewable energy power generation device comprises any one of a wind power generation system, a solar light power generation system and a solar heat power generation device.
5. The composite energy storage and power supply system according to claim 3, further comprising:
the local coordination processing controller is in communication connection with the battery energy storage device, the heat storage device and the central management device respectively, can receive instructions from the central management device, and can optimize the processing of the battery energy storage device and the heat storage device according to the instructions and the charge states of the battery energy storage device and the heat storage device.
6. The composite energy storage and power supply system according to claim 5, further comprising:
and an environment/load prediction device which is connected with the central management device in a communication way, generates prediction data including external environment and load change of the public alternating current bus, and transmits the prediction data to the central management device.
7. The composite energy storage and power supply system according to claim 5 or 6, wherein said battery energy storage device further comprises:
an energy module comprising a heat dissipation, measurement and signal circuit to provide energy storage;
the control module is used for providing a communication interface with the outside, monitoring the states of the energy module and the PCS, scheduling the setting of charge and discharge power according to an instruction from the local coordination processing controller and controlling the operation of the battery energy storage device;
and the power module responds to the instruction generated by the control module, controls the charging and discharging actions of the energy module and provides a grid-connected interface of the composite energy storage power supply system.
8. The hybrid energy storage and power supply system according to any one of claims 1 to 3, further comprising:
the inlet end of the electric energy conversion device is connected with the power output end of the renewable energy power generation device, and the outlet end of the electric energy conversion device is connected with the heat storage device and used for converting the electric energy generated by the renewable energy power generation device into the heat energy stored by the heat storage device.
9. The composite energy storage and power supply system of any one of claims 1 to 3, wherein the heat storage device comprises:
the heat storage device comprises at least one tank body, wherein a plurality of heat storage units can be contained in the tank body, and heat storage working mediums are contained in the heat storage units;
and the bypass control system can connect the heat storage unit working medium outlet and the heat storage unit working medium inlet in a bypass manner and is used for stabilizing the outlet state of the heat storage working medium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114704380A (en) * | 2022-03-14 | 2022-07-05 | 国网浙江省电力有限公司电力科学研究院 | Peak-shaving power generation system and method of coal-fired unit coupled with thermochemical energy storage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704380A (en) * | 2022-03-14 | 2022-07-05 | 国网浙江省电力有限公司电力科学研究院 | Peak-shaving power generation system and method of coal-fired unit coupled with thermochemical energy storage |
| CN114704380B (en) * | 2022-03-14 | 2023-07-14 | 国网浙江省电力有限公司电力科学研究院 | Peak regulation power generation system and method of coal-fired unit coupled with thermochemical energy storage |
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