Networking type energy storage control system and oscillation treatment method for Saggoer quarry wind-light-fire base

Abstract

The invention relates to a network construction type energy storage control system and oscillation treatment method for a Saggoga desert wind, light and fire base, and the system comprises a wind, light and fire storage combined power generation system, a synchronous phase modulation power station, a converter station, a fire storage combined power generation system and a booster station, and the wind, light and fire storage combined power generation system comprises a wind power base, a photovoltaic base and a wind and light base network construction type energy storage power station. The wind-light base network-construction type energy storage power station is connected with the first bus bar through the synchronous phase modulation power station and is connected with the second bus bar through the synchronous phase modulation power station and the converter station to provide first initial alternating current; the synchronous phase modulation power station provides short-circuit capacity and reactive power, and adjusts the voltage of the first initial alternating current and / or performs reactive compensation on the first initial alternating current according to the reactive power; the converter station improves the voltage level of the alternating current adjusted by the synchronous phase modulation power station; the fire-energy-storage combined power generation system provides second initial alternating current which is converged into the second bus bar through the booster station, and the problems that a wind-solar-fire base power grid is unstable and the electric energy quality is poor are solved.

Description

Technical Field

[0001] The present application relates to the field of new energy power generation technology, and in particular to a grid-type energy storage control system and an oscillation control method for a Shagohuang wind, solar and thermal power base. Background Art

[0002] With the continuous growth of global energy demand and increasing awareness of environmental protection, the proportion of renewable energy sources such as wind and solar power in the energy mix is ​​gradually increasing. The abundant wind and solar resources in the Shagohuang region make it an ideal choice for the development of large-scale wind, solar, thermal, and energy storage bases. However, such energy bases face numerous challenges when connecting to the power grid, especially under low short-circuit ratio conditions, which can easily affect grid stability and power quality.

[0003] Wind, solar, thermal, and storage energy bases typically consist of multiple subsystems, including wind, solar, and storage combined power generation systems and thermal and storage combined power generation systems. Coordinated control between these subsystems and with the power grid is crucial. Traditional grid access methods often struggle to provide sufficient voltage, frequency, and inertia support for large-scale renewable energy integration, and lack effective control measures for system oscillations. Furthermore, the intermittent and volatile nature of wind and solar power generation poses additional challenges to the stable operation of the power grid.

[0004] In order to meet these challenges and improve the grid support capacity and oscillation control level of the Shagohuang wind, solar, thermal and storage energy base, it is particularly important to study an effective grid construction and oscillation control method. Summary of the Invention

[0005] The present application provides a grid-type energy storage control system and an oscillation control method for the Shagohuang wind, solar, and thermal energy storage base, which solves the problems of insufficient grid stability and poor power quality under low short-circuit ratio access conditions of the Shagohuang wind, solar, and thermal energy storage base.

[0006] The first embodiment of the present application provides a grid-type energy storage control system for a Shagohuang wind, solar and thermal base, comprising: a wind, solar and storage combined power generation system, a synchronous phase-adjusting power station, a converter station, a thermal and storage combined power generation system and a booster station, wherein the wind, solar and storage combined power generation system comprises a wind power base, a photovoltaic base and a wind-solar base grid-type energy storage power station, the wind power base is connected to the first input end of the wind-solar base grid-type energy storage power station, the photovoltaic base is connected to the second input end of the wind-solar base grid-type energy storage power station, the wind-solar base grid-type energy storage power station is connected to the first busbar via the synchronous phase-adjusting power station, and the The wind-solar base grid-type energy storage power station is connected to the second busbar via the synchronous phase-modulation power station and the converter station, and is used to provide the first initial alternating current; the synchronous phase-modulation power station is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial alternating current according to the reactive power and / or perform reactive compensation on the first initial alternating current; the converter station is used to increase the voltage level of the alternating current regulated by the synchronous phase-modulation power station to a preset level based on a preset improvement strategy; the thermal-storage combined power generation system is used to provide the second initial alternating current, and merge it into the second busbar via the booster station.

[0007] Optionally, the grid-type energy storage power station of the wind-solar base includes: multiple grid-type energy storage devices and a grid-type energy storage controller, wherein the multiple grid-type energy storage devices include a multi-element energy storage unit and a grid-type energy storage converter, the multi-element energy storage unit is connected to the grid-type energy storage converter, the grid-type energy storage converter is used to use grid control to provide a unit current with a preset frequency and grid-type properties, the multiple grid-type energy storage devices are all connected to the grid-type energy storage controller, and the grid-type energy storage controller controls the grid-type energy storage converters in the multiple grid-type energy storage devices to provide a first initial alternating current with a preset frequency and grid-type properties.

[0008] Optionally, the multi-element energy storage unit includes: a sodium ion battery group, a supercapacitor group and a hydrogen storage device; the sodium ion battery group, the supercapacitor group and the hydrogen storage device are connected in parallel and are all connected to the grid-type energy storage converter; the supercapacitor group performs instantaneous energy storage to provide inertia support, the sodium ion battery group performs short-term energy storage, and the hydrogen storage device performs long-term energy storage; the sodium ion battery group, the supercapacitor group and the hydrogen storage device perform active power control, reactive power control, frequency control and voltage control through the grid-type energy storage converter.

[0009] Optionally, the grid-type energy storage controller controls the grid-type energy storage converter to adjust multiple preset parameters to perform primary frequency modulation, secondary frequency modulation, tertiary frequency modulation and voltage adjustment, and adjust the active power provided by the sodium ion battery, the supercapacitor and the electrolyzer.

[0010] Optionally, the thermal-storage combined power generation system includes a thermal power base and a thermal power base energy storage power station, the thermal power base is composed of multiple thermal power units connected in parallel, the thermal power base energy storage power station is arranged at the outlet of the multiple thermal power units, the thermal power base energy storage power station is connected to the booster station via the multiple thermal power units, and the thermal power base energy storage power station cooperates with the multiple thermal power units to complete the peak-shaving instructions, and / or frequency regulation instructions, and / or climbing instructions issued by the power grid.

[0011] Optionally, the thermal power base energy storage power station includes: a liquid flow battery cabin, a lithium iron phosphate battery cabin, a flywheel energy storage system and a cave compressed air energy storage system, wherein the liquid flow battery cabin includes a liquid flow battery system, a first battery control cabinet, a first battery power supply cabinet, a first battery management system, a first energy management system and a first grid-type converter, the liquid flow battery system includes a plurality of liquid flow battery groups connected in parallel, and the liquid flow battery group is composed of liquid flow batteries connected in series; the lithium iron phosphate battery cabin includes a lithium iron phosphate battery system, a second battery control cabinet, a second battery power supply cabinet, a second battery management system, a second energy management system and The second grid-type converter, the lithium iron phosphate battery system includes multiple groups of lithium iron phosphate battery packs connected in parallel, the lithium iron phosphate battery packs are composed of lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery compartment is used to modulate the frequency of the thermal power base; the flywheel energy storage system includes a flywheel body, a power converter station, bearings and a flywheel rotor, which is used to call the stored power according to the climbing requirements of the thermal power base to assist the thermal power base in climbing; the cave compressed air energy storage system is used to compress air in the cave using a compressor; the liquid flow battery compartment and the cave compressed air energy storage system are used to peak-shave the thermal power base.

[0012] Optionally, the thermal energy storage combined power generation system is also used to obtain the ramping demand and / or peak shaving demand of the thermal power base. When the maximum power generation of the thermal power base does not meet the power required for the ramping demand, the flywheel energy storage system is called to increase the power generation to the thermal power base, and / or the liquid flow battery cabin and the cave compressed air energy storage system are called to perform peak shaving according to the peak shaving demand.

[0013] Optionally, the photovoltaic base further includes photovoltaic panels and an inverter station, so as to be connected to the wind-solar base grid-type energy storage power station through the inverter station, and the wind power base includes a wind turbine generator set.

[0014] Optionally, it also includes: a broadband oscillation monitoring and management system, which is connected to the second busbar, and the broadband oscillation monitoring and management system includes a detection system and a management system. The detection system is used to obtain the full network impedance of the networking system of the Shagohuang wind, solar, thermal and storage base, and detect whether the networking system of the Shagohuang wind, solar, thermal and storage base is in an oscillating state based on the full network impedance; the management system is used to adjust the full network impedance when the networking system of the Shagohuang wind, solar, thermal and storage base is in the oscillating state until the networking system of the Shagohuang wind, solar, thermal and storage base is in a non-oscillating state.

[0015] In the above embodiment, it includes a wind-solar-storage combined power generation system, a synchronous phase-adjusting power station, a converter station, a thermal-storage combined power generation system and a booster station. The wind-solar base grid-type energy storage power station is connected to the first busbar via the synchronous phase-adjusting power station, and the wind-solar base grid-type energy storage power station is connected to the second busbar via the synchronous phase-adjusting power station and the converter station, which is used to provide the first initial AC power; the synchronous phase-adjusting power station is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial AC power according to the reactive power and / or perform reactive compensation on the first initial AC power; the converter station is used to increase the voltage level of the AC power adjusted by the synchronous phase-adjusting power station to a preset level based on a preset improvement strategy; the thermal-storage combined power generation system is used to provide the second initial AC power, and merge it into the second busbar via the booster station. As a result, the problems of insufficient grid stability and poor power quality under low short-circuit ratio access conditions at the Shagohuang wind, solar, and thermal storage energy base were solved. Through the coordinated control of multiple subsystems such as the wind, solar, and storage combined power generation system, the thermal storage combined power generation system, and the synchronous phase-shifting power station, the voltage, frequency, and inertia support of the power grid were achieved, the stability of the power grid was improved, and energy storage units such as the wind and solar base grid-type energy storage power station were used to smooth the output fluctuations of wind and solar power generation, reduce the impact on the power grid, and significantly improve the power quality.

[0016] A second aspect embodiment of the present application provides an oscillation control method for a grid-type energy storage control system of a Shagohuang wind, solar, and fire base. The grid-type energy storage control system of the Shagohuang wind, solar, and fire base is adopted, and the method includes the following steps: obtaining the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and fire base; judging whether the grid-type energy storage control system of the Shagohuang wind, solar, and fire base is in an oscillating state based on the full network impedance; if it is judged that the grid-type energy storage control system of the Shagohuang wind, solar, and fire base is in the oscillating state based on the full network impedance, then using the preset virtual impedance control system, the preset flow controller and the static compensator to adjust the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and fire base until the grid-type energy storage control system of the Shagohuang wind, solar, and fire base is in a non-oscillating state.

[0017] In the above embodiment, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is obtained; based on the full network impedance, it is determined whether the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is in an oscillating state; if the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is determined to be in an oscillating state based on the full network impedance, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is adjusted using a preset virtual impedance control system, a preset power flow controller, and a static compensator until the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is in a non-oscillating state. This solves the problem of insufficient grid stability and poor power quality at the Shagohuang wind, solar, and thermal power base under low short-circuit ratio access conditions. The broadband oscillation monitoring and control system monitors the oscillation situation in the power grid in real time, and makes a timely judgment on whether oscillation is occurring based on the judgment criteria. Once oscillation is detected, it is immediately controlled to effectively prevent the expansion and deterioration of the oscillation.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 Schematic diagram of a grid-type energy storage control system for a Shagohuang wind, solar, and fire base according to an embodiment of the present application;

[0021] Figure 2 This is a structural diagram of a synchronous phase modulation power station according to an embodiment of the present application;

[0022] Figure 3 This is a structural diagram of a wind-solar base grid-type energy storage power station according to one embodiment of the present application;

[0023] Figure 4 Schematic diagram of the structure of a grid-type energy storage device according to one embodiment of the present application;

[0024] Figure 5 is a control flow chart of a grid-type energy storage converter according to one embodiment of the present application;

[0025] Figure 6 Schematic diagram of the structure of a broadband oscillation monitoring and control system according to one embodiment of the present application;

[0026] Figure 7 This is a flow chart of an oscillation control method for a grid-type energy storage control system of the Shagohuang wind, light and fire base according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0028] The following describes the grid-type energy storage control system and oscillation control method of the Shagohuang wind, light and fire base in an embodiment of the present application with reference to the accompanying drawings. In response to the problems of insufficient grid stability and poor power quality of the Shagohuang wind, solar, and thermal energy storage base under low short-circuit ratio access conditions mentioned in the above background technology, the present application provides a grid-type energy storage control system for the Shagohuang wind, solar, and thermal energy storage base. In this system, it includes a wind, solar, and thermal energy storage combined power generation system, a synchronous phase-adjusting power station, a converter station, a thermal energy storage combined power generation system, and a booster station. The grid-type energy storage power station of the wind and solar base is connected to the first busbar via the synchronous phase-adjusting power station, and the grid-type energy storage power station of the wind and solar base is connected to the second busbar via the synchronous phase-adjusting power station and the converter station, for providing a first initial alternating current; the synchronous phase-adjusting power station is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial alternating current according to the reactive power and / or perform reactive compensation on the first initial alternating current; the converter station is used to increase the voltage level of the alternating current adjusted by the synchronous phase-adjusting power station to a preset level based on a preset improvement strategy; the thermal energy storage combined power generation system is used to provide a second initial alternating current, and merge it into the second busbar via the booster station. As a result, the problems of insufficient grid stability and poor power quality under low short-circuit ratio access conditions at the Shagohuang wind, solar, and thermal storage energy base were solved. Through the coordinated control of multiple subsystems such as the wind, solar, and storage combined power generation system, the thermal storage combined power generation system, and the synchronous phase-shifting power station, the voltage, frequency, and inertia support of the power grid were achieved, the stability of the power grid was improved, and energy storage units such as the wind and solar base grid-type energy storage power station were used to smooth the output fluctuations of wind and solar power generation, reduce the impact on the power grid, and significantly improve the power quality.

[0029] Specifically, Figure 1 This is a schematic diagram of a grid-type energy storage control system for the Shagohuang wind, light and fire base provided in an embodiment of the present application.

[0030] like Figure 1 As shown, the grid-type energy storage control system 10 of the Shagohuang wind, solar and thermal base includes: a wind, solar and storage combined power generation system 100, a synchronous phase-adjusting power station 200, a converter station 300, a thermal and storage combined power generation system 400 and a booster station 500.

[0031] The wind-solar-storage combined power generation system 100 includes a wind power base 101, a photovoltaic base 102, and a wind-solar-base grid-type energy storage station 103. The wind power base 101 is connected to the first input terminal of the wind-solar-base grid-type energy storage station 103, the photovoltaic base 102 is connected to the second input terminal of the wind-solar-base grid-type energy storage station 103, the wind-solar-base grid-type energy storage station 103 is connected to the first busbar via the synchronous phase modulation station 200, and the wind-solar-base grid-type energy storage station 103 is connected to the first busbar via the synchronous phase modulation station 200 and the converter station 3 00 is connected to the second busbar, and is used to provide the first initial alternating current; the synchronous phase-adjusting power station 200 is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial alternating current according to the reactive power and / or perform reactive compensation on the first initial alternating current; the converter station 300 is used to increase the voltage level of the alternating current adjusted by the synchronous phase-adjusting power station 200 to a preset level based on a preset improvement strategy; the thermal-storage combined power generation system 400 is used to provide the second initial alternating current, and merge it into the second busbar through the booster station 500.

[0032] It should be noted that the first busbar is a 35KV busbar, and the second busbar is a 220KV busbar.

[0033] In some embodiments, the photovoltaic base 102 further includes photovoltaic panels and an inverter station, which is connected to the wind-solar base grid-type energy storage power station 103 through the inverter station, and the wind power base 101 includes a wind turbine generator set.

[0034] Specifically, wind-solar-storage combined power generation system 100 includes a wind farm 101 comprised of wind turbines and a photovoltaic farm 102 comprised of photovoltaic panels and inverters. Both wind farm 101 and photovoltaic farm 102 are connected to a wind-solar grid-connected energy storage station 103. The grid-connected energy storage station 103 is connected to a 35kV busbar via a synchronous phase-shifting station 200 and then to a 220kV busbar via a converter station 300. Wind farm 101 and photovoltaic farm 102 are connected to the 35kV busbar with a low short-circuit ratio. The synchronous phase-shifting station 200 increases short-circuit capacity, improves system stability, and provides reactive power for voltage regulation and reactive power compensation.

[0035] The structure of the synchronous phase modulation power station 200 is as follows: Figure 2 As shown, it is composed of a synchronous phase modulation unit and a control system. The synchronous phase modulation unit is composed of multiple synchronous phase modulators connected in parallel. The multiple synchronous phase modulators are synchronous phase modulators (I) to synchronous phase modulators (N). The synchronous phase modulation power station 200 improves system stability by increasing the short-circuit capacity, provides reactive power, adjusts the voltage of the first initial AC power generated by the wind-solar-storage combined power generation system 100 according to the reactive power and / or performs reactive compensation on the first initial AC power. The converter station 300 increases the voltage level of the first initial AC power adjusted by the synchronous phase modulation power station 20.

[0036] The thermal-storage combined power generation system 400 is used to provide the second initial AC power, which is fed into the 220KV busbar via the booster station 500.

[0037] Optionally, in some embodiments, the wind-solar base grid-type energy storage power station 103 includes: multiple grid-type energy storage devices and a grid-type energy storage controller, wherein the multiple grid-type energy storage devices include a multi-element energy storage unit and a grid-type energy storage converter, the multi-element energy storage unit is connected to the grid-type energy storage converter, the grid-type energy storage converter is used to use grid control to provide a unit current with a preset frequency and grid-type properties, the multiple grid-type energy storage devices are all connected to the grid-type energy storage controller, the grid-type energy storage controller controls the grid-type energy storage converters in the multiple grid-type energy storage devices, and provides a first initial alternating current with a preset frequency and grid-type properties.

[0038] Specifically, the wind-solar base grid-type energy storage power station 103 consists of a multi-element energy storage unit, a grid-type energy storage converter and a grid-type energy storage controller. The multi-element energy storage unit is used to smooth the wind and solar power generation output. The grid-type energy storage controller is controlled by a virtual synchronous generator, so that the electricity generated by the wind-solar-storage combined power generation system 100 has grid-type properties, thereby improving grid-related performance.

[0039] Optionally, in some embodiments, the multi-element energy storage unit includes: a sodium ion battery group, a supercapacitor group and a hydrogen storage device, the sodium ion battery group, the supercapacitor group and the hydrogen storage device are connected in parallel and are all connected to a grid-type energy storage converter; the supercapacitor group performs instantaneous energy storage to provide inertia support, the sodium ion battery group performs short-term energy storage, and the hydrogen storage device performs long-term energy storage, and the sodium ion battery group, the supercapacitor group and the hydrogen storage device perform active power control, reactive power control, frequency control and voltage control through the grid-type energy storage converter.

[0040] Optionally, in some embodiments, the grid-type energy storage controller controls the grid-type energy storage converter to adjust multiple preset parameters to perform primary frequency modulation, secondary frequency modulation, tertiary frequency modulation and voltage adjustment, and adjust the active power provided by the sodium ion battery, supercapacitor and hydrogen storage device.

[0041] Specifically, the specific structure of the wind-solar base grid-type energy storage power station 103 is as follows: Figure 3 As shown, the multi-element energy storage unit includes a sodium ion battery group, a supercapacitor group and a hydrogen storage device. The specific structure of the multi-element energy storage unit is as follows: Figure 4 shown.

[0042] Among them, sodium ion batteries are connected in series to form a sodium ion battery group, supercapacitors are connected in series to form a supercapacitor group and N hydrogen storage tanks to form a hydrogen storage device, and the hydrogen storage device stores hydrogen for long-term hydrogen energy storage.

[0043] Active power is provided by adjusting the charging and discharging of the sodium-ion battery pack + supercapacitor pack + hydrogen storage device through a grid-type converter, with complementary advantages. Active power support is provided at the second, minute, hour, and even seasonal and annual levels, achieving flexible frequency regulation throughout the entire period. The supercapacitor pack can provide active power in a short period of time to achieve inertia support. The sodium-ion battery pack provides minute and hour-level active power support to smooth the output of new energy. The hydrogen storage device provides long-term energy storage.

[0044] The grid-type energy storage converter is connected to the sodium-ion battery group, supercapacitor group and hydrogen storage device, and controls the output of the multi-energy storage unit through the virtual synchronous generator, which has the characteristics of grid-type energy storage and improves the grid-related performance. The grid-type energy storage converter adjusts the active power provided by the sodium-ion battery group + supercapacitor group + hydrogen storage device. The specific control method of the grid-type energy storage converter is as follows: Figure 5 As shown in the figure, the phase angle of the generated voltage is adjusted by adjusting the parameters such as Dp and J, and the amplitude of the generated voltage is adjusted by adjusting multiple preset parameters Kp, Ki, and Kq through the PID controller, where Kq is related to the reactive power provided by the multi-element energy storage unit. When the grid-type energy storage converter receives the frequency modulation instruction of the power grid, the PID controller adjusts multiple preset parameters Kp, Ki, and Kq. fp , K fi , K fq , completing primary frequency regulation, secondary frequency regulation and tertiary frequency regulation, thereby adjusting the active power of the multi-element energy storage unit.

[0045] In some embodiments, the thermal-storage combined power generation system 400 includes a thermal power base 401 and a thermal power base energy storage power station 402. The thermal power base 401 is composed of multiple thermal power units connected in parallel. The thermal power base energy storage power station 402 is set at the outlet of the multiple thermal power units. The thermal power base energy storage power station 402 is connected to the booster station 500 through the multiple thermal power units. The thermal power base energy storage power station 402 cooperates with the multiple thermal power units to complete the peak-shaving instructions, and / or frequency regulation instructions, and / or climbing instructions issued by the power grid.

[0046] Specifically, the thermal-storage combined power generation system 400 includes a thermal power base 401 and a thermal power base energy storage power station 402. The thermal power base energy storage power station 402 is set at the outlet of multiple thermal power units. The thermal power base energy storage power station 402 is connected to the booster station 500 through multiple thermal power units. The booster station 500 is connected to the 220KV busbar. The thermal power base energy storage power station 402 cooperates with the thermal power units to complete the peak-shaving instructions, and / or frequency regulation instructions, and / or climbing instructions issued by the power grid.

[0047] In some embodiments, the thermal power base energy storage station 402 includes: a liquid flow battery cabin, a lithium iron phosphate battery cabin, a flywheel energy storage system and a cave compressed air energy storage system, wherein the liquid flow battery cabin includes a liquid flow battery system, a first battery control cabinet, a first battery power supply cabinet, a first battery management system, a first energy management system and a first grid-type converter, the liquid flow battery system includes a plurality of liquid flow battery groups connected in parallel, and the liquid flow battery group is composed of liquid flow batteries connected in series; the lithium iron phosphate battery cabin includes a lithium iron phosphate battery system, a second battery control cabinet, a second battery power supply cabinet, a second battery management system, a first grid-type converter, and a liquid flow battery system. The second energy management system and the second grid-type converter, the lithium iron phosphate battery system includes multiple groups of lithium iron phosphate battery packs connected in parallel, and the lithium iron phosphate battery packs are composed of lithium iron phosphate batteries connected in series. The lithium iron phosphate battery cabin is used to regulate the frequency of the thermal power base; the flywheel energy storage system includes a flywheel body, a power converter station 300, bearings and a flywheel rotor, which is used to call the stored power according to the climbing requirements of the thermal power base to assist the thermal power base in climbing; the cave compressed air energy storage system is used to compress air in the cave using a compressor; the liquid flow battery cabin and the cave compressed air energy storage system are used to peak the thermal power base.

[0048] Specifically, the thermal power base energy storage power station 402 includes a liquid flow battery compartment, a lithium iron phosphate battery compartment, a flywheel energy storage system and a cave compressed air energy storage system.

[0049] The flow battery compartment includes a flow battery system and a first battery control cabinet, a first battery power supply cabinet, a first battery management system, a first energy management system, and a first grid-type converter. The flow batteries are connected in series to form a flow battery pack, and multiple flow battery packs are connected in parallel to form a flow battery system.

[0050] The rock cave compressed air energy storage system uses a compressor to compress air in the rock cave. When the thermal power base 401 needs to shave peak energy, the compressed air energy storage and liquid flow battery energy storage are called upon. The two together form the peak-shaving energy storage, which is used for peak-shaving energy mobilization of the thermal power base.

[0051] The lithium iron phosphate battery compartment includes a lithium iron phosphate battery system, a second battery control cabinet, a second battery power supply cabinet, a second battery management system, a second energy management system, and a second grid-type converter. It is used for primary and secondary frequency regulation of thermal power base 401. Lithium iron phosphate batteries are connected in series to form a lithium iron phosphate battery pack, and multiple lithium iron phosphate battery packs are connected in parallel to form a lithium iron phosphate battery system.

[0052] The flywheel body, power conversion device, bearings, flywheel rotor, etc. constitute the flywheel energy storage system. The flywheel energy storage system can call on the internal stored power in a short time to meet the climbing requirements of the thermal power base 401.

[0053] Optionally, in some embodiments, the thermal energy storage combined power generation system 400 is also used to obtain the ramping demand and / or peak shaving demand of the thermal power base 401. When the maximum power generation of the thermal power base 401 does not meet the power required for the ramping demand, the flywheel energy storage system is called to increase the power generation to the thermal power base 401, and / or the liquid flow battery cabin and the cave compressed air energy storage system are called for peak shaving according to the peak shaving demand.

[0054] Specifically, the thermal-storage combined power generation system 400 is also used to obtain the climbing demand of the thermal power base 401, and determine whether the maximum power generation of the thermal power base 401 meets the total amount of electric energy required to complete the climbing requirements. If the total amount of electric energy required to complete the climbing requirements can be met, the thermal power base 401 is controlled to increase the power generation to complete the climbing task; if the total amount of electric energy required to complete the climbing requirements cannot be met, the flywheel energy storage system is controlled to increase the power generation to the thermal power base 401 to assist the thermal power base 401 in completing the climbing task.

[0055] The thermal energy storage combined power generation system 400 is also used to obtain the peak-shaving demand of the thermal power base 401, and determine whether the maximum power generation of the thermal power base 401 meets the total amount of electricity required to meet the requirements of the power grid. If it can meet the total amount of electricity required to meet the requirements of the power grid, the thermal power base 401 is controlled to increase the power generation to complete the peak-shaving task. If it cannot meet the total amount of electricity required to meet the requirements of the power grid, the liquid flow battery cabin and the cave compressed air energy storage system are called for peak-shaving to assist the thermal power base 401 in completing the peak-shaving task.

[0056] Optionally, in some embodiments, it also includes: a broadband oscillation monitoring and management system 600, the broadband oscillation monitoring and management system 600 is connected to the second busbar, the broadband oscillation monitoring and management system 600 includes a detection system and a management system, the detection system is used to obtain the full network impedance of the network system of the Shagohuang wind, solar, thermal and storage base, and detect whether the network system of the Shagohuang wind, solar, thermal and storage base is in an oscillating state based on the full network impedance; the management system is used to adjust the full network impedance when the network system of the Shagohuang wind, solar, thermal and storage base is in an oscillating state until the network system of the Shagohuang wind, solar, thermal and storage base is in a non-oscillating state.

[0057] It should be understood that the broadband oscillation monitoring and control system 600 includes a detection system and a control system. The detection system is used to detect the full network impedance of the network system of the Shagohuang wind, solar, and thermal energy storage base, and to determine whether the network system of the Shagohuang wind, solar, and thermal energy storage base is oscillating. If it is detected that the network system of the Shagohuang wind, solar, and thermal energy storage base is oscillating, the control system is used to control it.

[0058] The detection system consists of an impedance scanner installed on the 220 kV interconnection line. This device measures the impedance of the entire network of the Shagohuang wind, solar, thermal, and energy storage base. Based on this impedance, it determines whether the system is in an oscillation state. The control system, which includes a virtual impedance control system, a unified power flow controller, and a static compensator, manages broadband oscillations by adjusting impedance.

[0059] Specific detection and management processes such as Figure 6 As shown: The impedance scanning device tests the total impedance of the 220KV network through excitation in different frequency bands, and determines whether oscillation occurs using the Nyquist criterion;

[0060] If the grid system of the Shagohuang wind, solar, thermal and energy storage base oscillates, the virtual impedance control system is called to increase or decrease the impedance, and detect whether the grid system of the Shagohuang wind, solar, thermal and energy storage base still oscillates after the impedance is increased or decreased. If it still oscillates, the unified power flow controller and the static compensator are called. If it does not oscillate, there is no need to call the unified power flow controller and the static compensator to adjust the full network impedance of the grid system of the Shagohuang wind, solar, thermal and energy storage base.

[0061] According to the grid-type energy storage control system of the Shagohuang wind, solar and thermal base proposed in the embodiment of the present application, it includes a wind, solar and storage combined power generation system, a synchronous phase-adjusting power station, a converter station, a thermal storage combined power generation system and a booster station. The grid-type energy storage power station of the wind and solar base is connected to the first busbar via the synchronous phase-adjusting power station, and the grid-type energy storage power station of the wind and solar base is connected to the second busbar via the synchronous phase-adjusting power station and the converter station, so as to provide a first initial alternating current; the synchronous phase-adjusting power station is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial alternating current according to the reactive power and / or perform reactive compensation on the first initial alternating current; the converter station is used to increase the voltage level of the alternating current adjusted by the synchronous phase-adjusting power station to a preset level based on a preset improvement strategy; the thermal storage combined power generation system is used to provide a second initial alternating current, and merge it into the second busbar via the booster station. As a result, the problems of insufficient grid stability and poor power quality under low short-circuit ratio access conditions at the Shagohuang wind, solar, and thermal storage energy base were solved. Through the coordinated control of multiple subsystems such as the wind, solar, and storage combined power generation system, the thermal storage combined power generation system, and the synchronous phase-shifting power station, the voltage, frequency, and inertia support of the power grid were achieved, the stability of the power grid was improved, and energy storage units such as the wind and solar base grid-type energy storage power station were used to smooth the output fluctuations of wind and solar power generation, reduce the impact on the power grid, and significantly improve the power quality.

[0062] Next, the oscillation control method of the grid-type energy storage control system of the Shagohuang wind, light and fire base proposed in the embodiment of the present application is described with reference to the accompanying drawings.

[0063] Figure 7It is a flow chart of the oscillation control method of the grid-type energy storage control system of the Shagohuang wind, light and fire base in the embodiment of the present application.

[0064] like Figure 7 As shown, the oscillation control method of the grid-type energy storage control system of the Shagohuang wind, light and fire base includes the following steps:

[0065] In step S701, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, light and fire base is obtained.

[0066] In step S702, it is determined whether the grid-type energy storage control system of the Shagohuang wind, light and fire base is in an oscillation state based on the impedance of the entire network.

[0067] In step S703, if it is determined based on the full network impedance that the grid-type energy storage control system of the Shagohuang wind, light and fire base is in an oscillating state, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, light and fire base is adjusted using a preset virtual impedance control system, a preset flow controller and a static compensator until the grid-type energy storage control system of the Shagohuang wind, light and fire base is in a non-oscillating state.

[0068] Specifically, the impedance scanning device in the broadband oscillation monitoring and treatment system tests the total impedance of the 220KV network through excitation in different frequency bands, and determines whether oscillation occurs using the Nyquist criterion;

[0069] If the grid system of the Shagohuang wind, solar, and thermal energy storage base oscillates, the control system in the broadband oscillation monitoring and control system is called, and the preset virtual impedance control system is used to increase or decrease the impedance to detect whether the grid system of the Shagohuang wind, solar, and thermal energy storage base is still oscillating after the impedance is increased or decreased. If it is still oscillating, the preset power flow controller (i.e., unified power flow controller) and static compensator are called to adjust the full network impedance of the grid system of the Shagohuang wind, solar, and thermal energy storage base. If there is no oscillation, there is no need to call the unified power flow controller and the static compensator to adjust the full network impedance of the grid system of the Shagohuang wind, solar, and thermal energy storage base.

[0070] According to the oscillation control method for the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base proposed in the embodiment of the present application, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is obtained; based on the full network impedance, it is determined whether the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is in an oscillating state; if it is determined that the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is in an oscillating state based on the full network impedance, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is adjusted using a preset virtual impedance control system, a preset power flow controller, and a static compensator until the grid-type energy storage control system of the Shagohuang wind, solar, and thermal power base is in a non-oscillating state. This solves the problem of insufficient grid stability and poor power quality of the Shagohuang wind, solar, and thermal power base under low short-circuit ratio access conditions. The broadband oscillation monitoring and control system monitors the oscillation situation in the power grid in real time, and makes a timely judgment on whether oscillation is occurring based on the criteria. Once oscillation is detected, it is immediately controlled to effectively prevent the expansion and deterioration of the oscillation.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0073] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0074] The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer program product for use with, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate, or transmit a program for use with, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer program products include the following: an electrical connection having one or N wires (electronic devices), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). Furthermore, the computer program product may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or, if necessary, processing it in another suitable manner, and then storing it in a computer memory.

[0075] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer program product, which, when executed, includes one or a combination of the steps of the method embodiment.

[0077] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer program product.

[0078] The computer program product mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A grid-type energy storage control system for the Shagohuang wind, light and fire base, characterized in that: include: Wind, solar and storage combined power generation system, synchronous phase adjustment power station, converter station, thermal and storage combined power generation system and booster station, among which, The wind-solar-storage combined power generation system includes a wind power base, a photovoltaic base, and a wind-solar base grid-type energy storage power station. The wind power base is connected to a first input terminal of the wind-solar base grid-type energy storage power station, the photovoltaic base is connected to a second input terminal of the wind-solar base grid-type energy storage power station, the wind-solar base grid-type energy storage power station is connected to a first busbar via the synchronous phase-adjusting power station, and the wind-solar base grid-type energy storage power station is connected to a second busbar via the synchronous phase-adjusting power station and the converter station, for providing a first initial alternating current. The synchronous phase modulation system is used to provide short-circuit capacity and reactive power, and adjust the voltage of the first initial alternating current according to the reactive power and / or perform reactive compensation on the first initial alternating current; The converter station is configured to increase the voltage level of the AC power regulated by the synchronous phase modulation system to a preset level based on a preset increasing strategy; The thermal-storage combined power generation system is used to provide a second initial alternating current, which is then fed into the second busbar via the booster station.

2. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 1 is characterized in that: The wind-solar base grid-type energy storage power station includes: a plurality of grid-type energy storage devices and a grid-type energy storage controller, wherein: The multiple grid-type energy storage devices include a multi-element energy storage unit and a grid-type energy storage converter, the multi-element energy storage unit is connected to the grid-type energy storage converter, the grid-type energy storage converter is used to use grid control to provide a unit current with a preset frequency and grid-type properties, the multiple grid-type energy storage devices are all connected to the grid-type energy storage controller, and the grid-type energy storage controller controls the grid-type energy storage converters in the multiple grid-type energy storage devices to provide a first initial alternating current with a preset frequency and grid-type properties.

3. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 2 is characterized in that: The multi-element energy storage unit includes: a sodium ion battery pack, a supercapacitor pack and a hydrogen storage device. The sodium ion battery pack, the supercapacitor pack and the hydrogen storage device are connected in parallel and are all connected to the grid-type energy storage converter; The supercapacitor group performs instantaneous energy storage to provide inertia support, the sodium ion battery group performs short-term energy storage, and the hydrogen storage device performs long-term energy storage. The sodium ion battery group, the supercapacitor group and the hydrogen storage device perform active power control, reactive power control, frequency control and voltage control through the grid-type energy storage converter.

4. According to the grid-type energy storage control system of the Shagohuang wind and light fire base in claim 3, the grid-type energy storage controller controls the grid-type energy storage converter to adjust multiple preset parameters to perform primary frequency modulation, secondary frequency modulation, tertiary frequency modulation and voltage adjustment, and adjust the active power provided by the sodium ion battery, the supercapacitor and the hydrogen storage device.

5. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 1 is characterized in that: The thermal power generation system with combined thermal storage includes a thermal power base and a thermal power base energy storage power station. The thermal power base is composed of multiple thermal power units connected in parallel. The thermal power base energy storage power station is arranged at the outlet of the multiple thermal power units. The thermal power base energy storage power station is connected to the booster station via the multiple thermal power units. The thermal power base energy storage power station cooperates with the multiple thermal power units to complete the peak-shaving instructions, and / or frequency regulation instructions, and / or climbing instructions issued by the power grid.

6. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 5 is characterized in that: The thermal power base energy storage power station includes: a liquid flow battery compartment, a lithium iron phosphate battery compartment, a flywheel energy storage system and a cave compressed air energy storage system, wherein: The liquid flow battery cabin includes a liquid flow battery system, a first battery control cabinet, a first battery power supply cabinet, a first battery management system, a first energy management system and a first grid-type converter. The liquid flow battery system includes a plurality of liquid flow battery groups connected in parallel, and the liquid flow battery group is composed of liquid flow batteries connected in series. The lithium iron phosphate battery compartment includes a lithium iron phosphate battery system, a second battery control cabinet, a second battery power supply cabinet, a second battery management system, a second energy management system, and a second grid-type converter. The lithium iron phosphate battery system includes multiple groups of lithium iron phosphate battery packs connected in parallel. The lithium iron phosphate battery packs are composed of lithium iron phosphate batteries connected in series. The lithium iron phosphate battery compartment is used to perform frequency modulation on the thermal power base. The flywheel energy storage system includes a flywheel body, a power converter station, a bearing and a flywheel rotor, and is used to call the stored power to assist the thermal power base in climbing according to the climbing requirements of the thermal power base; The rock cave compressed air energy storage system is used to compress air in the rock cave using a compressor; The liquid flow battery cabin and cave compressed air energy storage system are used to perform peak regulation on the thermal power base.

7. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 6 is characterized in that: The thermal energy storage combined power generation system is also used to obtain the ramping demand and / or peak shaving demand of the thermal power base. When the maximum power generation of the thermal power base does not meet the power required for the ramping demand, the flywheel energy storage system is called to increase the power generation to the thermal power base, and / or the liquid flow battery cabin and the cave compressed air energy storage system are called to perform peak shaving according to the peak shaving demand.

8. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 1 is characterized in that: The photovoltaic base also includes photovoltaic panels and an inverter station, which is connected to the wind-solar base grid-type energy storage power station through the inverter station, and the wind power base includes a wind turbine generator set.

9. The grid-type energy storage control system of the Shagohuang wind, light and fire base according to claim 8 is characterized in that: Also includes: A broadband oscillation monitoring and control system, the broadband oscillation monitoring and control system being connected to the second busbar, the broadband oscillation monitoring and control system comprising a detection system and a control system, the detection system being used to obtain the full network impedance of the grid system of the Shagohuang wind, solar, thermal and energy storage base, and to detect whether the grid system of the Shagohuang wind, solar, thermal and energy storage base is in an oscillation state based on the full network impedance; The governance system is used to adjust the impedance of the entire network when the networking system of the Shagohuang wind, solar, and thermal energy storage base is in the oscillation state until the networking system of the Shagohuang wind, solar, and thermal energy storage base is in a non-oscillation state.

10. A method for controlling oscillations in a grid-type energy storage control system for a Shagohuang wind, solar, and thermal power base, characterized in that: A grid-type energy storage control system for the Shagohuang wind, light, and fire base according to any one of claims 1 to 9 is used, wherein the method comprises the following steps: Obtaining the full network impedance of the grid-type energy storage control system of the Shagohuang wind and light fire base; Determining whether the grid-type energy storage control system of the Shagohuangfengguanghuo base is in an oscillation state based on the full network impedance; If it is determined based on the full network impedance that the grid-type energy storage control system of the Shagohuang wind, light and fire base is in the oscillation state, the full network impedance of the grid-type energy storage control system of the Shagohuang wind, light and fire base is adjusted using the preset virtual impedance control system, the preset flow controller and the static compensator until the grid-type energy storage control system of the Shagohuang wind, light and fire base is in a non-oscillation state.

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