Low-frequency and low-voltage load shedding control method and system for plateau energy power station

Abstract

The invention discloses a low-frequency / low-voltage load shedding control method and system for a plateau energy power station, and the method and system are applied to the plateau energy power station, the plateau energy power station comprises a photo-thermal power generation system, a photovoltaic power generation system and an energy storage power generation system, and the current output power of the photo-thermal power generation system and the photovoltaic power generation system and a power instruction issued by a dispatching master station are detected in real time; active and reactive output of the energy storage power generation system is controlled; detecting a target operation parameter of the energy power station in real time, and when the target operation parameter is lower than a preset value, adjusting active and reactive output of the energy storage power generation system; the voltage and the frequency of the energy station bus are collected again, if the target operation parameters of the energy station bus are still lower than the preset values, the low-frequency / low-voltage load shedding function is started, and corresponding loads are cut off. After the energy storage power generation system is adjusted, the voltage and frequency data of the bus of the energy station can be collected again, if the data collected again is still lower than a preset value, the low-frequency / low-voltage load shedding function is started, and part of loads are cut off to prevent the power grid from collapsing.

Description

Technical Field

[0001] The invention belongs to the technical field of high-altitude power supply, and particularly relates to a low-frequency / low-voltage load shedding control method and system for a high-altitude energy power station. Background Art

[0002] China has a vast territory and a large span of east-west longitude. In the northwest region of China, the solar energy resource conditions are superior, and it is suitable to build large-scale solar energy utilization projects. However, it cannot be ignored that the northwest region is a high-altitude area with thin population, and the current power grid system is at the end of the power system in the northwest region and is unstable. Under certain special conditions, the end of the power system is prone to instability, and the voltage or frequency is prone to large fluctuations. In extreme cases, if disconnected from the national grid and the photovoltaic or solar thermal power generation is unstable, the high-altitude energy power station will not be able to meet the electricity demand of the load, resulting in the collapse of the energy power station.

[0003] The Zabuye Salt Lake lithium extraction project is located on the plateau, in a remote location, with high fossil energy costs and weak power grid support. The load of the lithium carbonate processing plant is relatively stable, with low safety risks and controllable power outage losses. Therefore, using the local rich solar energy resources to build an independent power grid based on new energy to supply power to the lithium carbonate processing plant is a reasonable choice economically. The location of the Zabuye Salt Lake has sufficient sunlight and rich land resources, suitable for building a "solar thermal + photovoltaic + energy storage" energy supply system. However, there was previously a lack of a low-frequency / low-voltage load shedding control scheme for high-altitude energy power stations including solar thermal power generation systems, photovoltaic power generation systems, and energy storage power generation systems. Summary of the Invention

[0004] To solve the above problems, the purpose of the present invention is to provide a low-frequency / low-voltage load shedding control method and system for a high-altitude energy power station. After adjusting the energy storage power generation system, the system will re-collect the voltage and frequency data of the energy station bus to evaluate the adjustment effect. If the re-collected data shows that the target operating parameters are still lower than the preset values, the system will activate the low-frequency / low-voltage load shedding function to prevent the power grid from collapsing by cutting off some loads.

[0005] The technical solution provided by the present invention is: a low-frequency / low-voltage load shedding control method for a high-altitude energy power station, which is applied to a high-altitude energy power station. The high-altitude energy power station includes a solar thermal power generation system, a photovoltaic power generation system, and an energy storage power generation system, and includes the following steps: Real-time detect the power output by the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station, and control the active and reactive power output of the energy storage power generation system; Real-time detect the target operating parameters of the energy power station. When the target operating parameters are lower than the preset values, adjust the active and reactive power output of the energy storage power generation system; Re - collect the voltage and frequency of the energy station bus. If the target operating parameters of the energy station bus are still lower than the preset values, start the low - frequency / low - voltage load shedding function to cut off the corresponding load.

[0006] Preferably, the real - time detection of the power output by the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station, and the control of the active and reactive power output of the energy storage power generation system further includes: Real - time collect the operation data of the photovoltaic cell array, bus - bar trunking system, and inverter through the remote monitoring system, and real - time collect the real - time output data of the solar thermal power generation unit of the solar thermal power generation system through the remote monitoring system; Calculate the required output data of the energy storage power generation system based on the power command issued by the dispatching master station; Control the active and reactive power output of the energy storage power generation system based on the required output data.

[0007] Preferably, the real - time detection of the target operating parameters of the energy station, and when the target operating parameters are lower than the preset values, the adjustment of the active and reactive power output of the energy storage power generation system further includes: Real - time detect the voltage, frequency, and power of the energy station bus; When there are frequency abnormalities, low voltage, slip - value abnormalities, PT disconnection, or manual locking of the control chassis, lock the low - frequency load shedding function and upload the locking information.

[0008] Preferably, the frequency abnormality is: f < 42Hz or f > 58Hz, the low voltage is: positive - sequence voltage < 0.15Un (rated voltage), the slip - value abnormality is: df / dt ≤ - 10Hz / s, and the PT disconnection is: negative - sequence voltage > 0.15Un (rated voltage).

[0009] Preferably, starting the low - frequency / low - voltage load shedding function and cutting off the corresponding load further includes: Sequentially cut off the power supply priorities from low to high until when the corresponding load is cut off, the target operating parameters of the energy station bus are not lower than the preset values.

[0010] Based on the same concept, the present invention also provides a low - frequency / low - voltage load shedding control system for a plateau energy station. The plateau energy station includes a solar thermal power generation system, a photovoltaic power generation system, and an energy storage power generation system, and includes: An energy storage control module, used for real - time detecting the power output by the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station, and controlling the active and reactive power output of the energy storage power generation system; A preliminary adjustment module, used for real - time detecting the target operating parameters of the energy station, and when the target operating parameters are lower than the preset values, adjusting the active and reactive power output of the energy storage power generation system; The load shedding module is used to re - collect the voltage and frequency of the bus of the energy station. If the target operating parameters of the bus of the energy station are still lower than the preset values, the low - frequency / low - voltage load shedding function is started to shed the corresponding load.

[0011] Preferably, the preliminary adjustment module real - time detects the voltage, frequency and power of the bus of the energy station; when there are frequency anomalies, low voltage, abnormal slip values, PT disconnection or manual locking of the control chassis, the low - frequency load shedding function is locked and the locking information is uploaded.

[0012] Preferably, the energy storage control module real - time collects the operation data of the photovoltaic cell array, the bus - bar box and the inverter through the remote monitoring system, and real - time collects the real - time output data of the solar thermal power generation system's solar thermal generating units through the remote monitoring system; calculates the required output data of the energy storage power generation system based on the power command issued by the dispatching master station; controls the active and reactive power output of the energy storage power generation system based on the required output data.

[0013] Based on the same concept, the present invention also provides an electronic device, including: A memory for storing a processing program; A processor, when the processor executes the processing program, implements the low - frequency / low - voltage load shedding control method of the high - altitude energy station in any one of the above.

[0014] Based on the same concept, the present invention also provides a readable storage medium, on which a processing program is stored. When the processing program is executed by a processor, the low - frequency / low - voltage load shedding control method of the high - altitude energy station in any one of the above is implemented.

[0015] Due to the above - mentioned technical solutions, the present invention has the following advantages and positive effects compared with the prior art: The present invention ensures timely response to any power change by real - time monitoring the power output of the solar thermal power generation system and the photovoltaic power generation system. According to the power command issued by the dispatching master station, the active and reactive power output of the energy storage power generation system is dynamically adjusted to match the grid demand. Once it is detected that the target operating parameters are lower than the preset values, the system will automatically adjust the output of the energy storage power generation system to stabilize the grid state. After adjusting the energy storage power generation system, the system will re - collect the voltage and frequency data of the bus of the energy station to evaluate the adjustment effect. If the re - collected data indicates that the target operating parameters are still lower than the preset values, the system will start the low - frequency / low - voltage load shedding function to prevent the grid from collapsing by shedding some loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further details the specific embodiments of the present invention with reference to the drawings, where: Figure 1 is the low - frequency / low - voltage load shedding control logic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be more clearly understood. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0019] First Embodiment This embodiment provides a low-frequency / low-voltage load shedding control method for a high-altitude energy power station, which is applied to a high-altitude energy power station. The high-altitude energy power station includes a solar thermal power generation system, a photovoltaic power generation system, and a energy storage power generation system, and includes the following steps: Real-time detect the power output by the current solar thermal power generation system and the photovoltaic power generation system and the power command issued by the dispatching master station, and control the active and reactive power output of the energy storage power generation system; Real-time detect the target operating parameters of the energy power station. When the target operating parameters are lower than the preset values, adjust the active and reactive power output of the energy storage power generation system; Re-collect the voltage and frequency of the busbar of the energy station. If the target operating parameters of the energy power station busbar are still lower than the preset values, start the low-frequency / low-voltage load shedding function and cut off the corresponding load.

[0020] The system in this embodiment monitors the power output of the solar thermal power generation system and the photovoltaic power generation system in real time to ensure that it can respond to any power change in a timely manner. According to the power command issued by the dispatching master station, dynamically adjust the active and reactive power output of the energy storage power generation system to match the grid demand. Once it is detected that the target operating parameters are lower than the preset values, the system will automatically adjust the output of the energy storage power generation system to stabilize the grid state. After adjusting the energy storage power generation system, the system will re-collect the voltage and frequency data of the busbar of the energy station to evaluate the adjustment effect. If the re-collected data indicates that the target operating parameters are still lower than the preset values, the system will start the low-frequency / low-voltage load shedding function and prevent the grid from collapsing by cutting off some loads.

[0021] Preferably, real-time detect the power output by the current solar thermal power generation system and the photovoltaic power generation system and the power command issued by the dispatching master station, and controlling the active and reactive power output of the energy storage power generation system further includes: Real-time collect the operation data of the photovoltaic cell array, the busbar box, and the inverter through the remote monitoring system, and real-time collect the real-time output data of the solar thermal power generation units of the solar thermal power generation system through the remote monitoring system; Calculate the corresponding output data of the energy storage power generation system based on the power command issued by the dispatching master station; Control the active and reactive power outputs of the energy storage power generation system based on the corresponding output data.

[0022] Through the remote monitoring system, the operation data of the photovoltaic cell array, the busbar box and the inverter are collected in real time. At the same time, the real-time output data of the solar thermal power generation system are also continuously monitored to ensure the timeliness and accuracy of the data.

[0023] Preferably, when the target operation parameters of the energy power station are detected in real time and are lower than the preset values, the regulation of the active and reactive power outputs of the energy storage power generation system further includes: Detect the voltage, frequency and power of the energy station busbar in real time; When there are frequency anomalies, low voltage, abnormal slip values, PT disconnection or manual locking of the control cabinet, lock the low-frequency load shedding function and upload the locking information.

[0024] Detect the voltage, frequency and power of the energy station busbar in real time to ensure that the system operates within the normal range. Through high-precision monitoring equipment, any abnormal changes are captured in a timely manner to provide data support for subsequent regulation and control. When the target operation parameters are lower than the preset values, the system automatically adjusts the active and reactive power outputs of the energy storage power generation system. Through intelligent control strategies, it responds quickly to the grid demand and maintains the stability of the power system.

[0025] Preferably, the frequency anomaly is: f < 42Hz or f > 58Hz, the low voltage is: positive sequence voltage < 0.15Un rated voltage, the abnormal slip value is: df / dt ≤ -10Hz / s, and the PT disconnection is: negative sequence voltage > 0.15Un rated voltage.

[0026] Preferably, when starting the low-frequency / low-voltage load shedding function and cutting off the corresponding load, it further includes: Sequentially cut off the power supply priorities from low to high until the target operation parameters of the energy power station busbar are not lower than the preset values when the corresponding load is cut off.

[0027] Based on the same concept, the present invention also provides a low-frequency / low-voltage load shedding control system for a plateau energy power station. The plateau energy power station includes a solar thermal power generation system, a photovoltaic power generation system, and an energy storage power generation system, including: An energy storage control module, which is used to detect the power output by the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station in real time, and control the active and reactive power outputs of the energy storage power generation system; A preliminary adjustment module, which is used to detect the target operation parameters of the energy power station in real time, and when the target operation parameters are lower than the preset values, adjust the active and reactive power outputs of the energy storage power generation system; The load shedding module is used to re-collect the voltage and frequency of the busbar of the energy station. If the target operating parameters of the busbar of the energy power station are still lower than the preset values, the low-frequency / low-voltage load shedding function is started to shed the corresponding load.

[0028] Preferably, the preliminary adjustment module real-time detects the voltage, frequency and power of the busbar of the energy station; when there are abnormal frequencies, low voltages, abnormal slip values, PT disconnections or manual locking of the control chassis, the low-frequency load shedding function is locked and the locking information is uploaded.

[0029] Preferably, the energy storage control module real-time collects the operation data of the photovoltaic cell array, the busbar box and the inverter through the remote monitoring system, and real-time collects the real-time output data of the solar thermal power generation system's solar thermal generating units through the remote monitoring system; calculates the corresponding output data of the energy storage power generation system based on the power command issued by the dispatching master station; controls the active and reactive power outputs of the energy storage power generation system based on the corresponding output data.

[0030] Based on the same concept, the present invention also provides an electronic device, including: A memory for storing a processing program; A processor that implements the low-frequency / low-voltage load shedding control method of the high-altitude energy power station in any of the above when executing the processing program.

[0031] Based on the same concept, the present invention also provides a readable storage medium with a processing program stored thereon. When the processing program is executed by a processor, it implements the low-frequency / low-voltage load shedding control method of the high-altitude energy power station in any of the above.

[0032] If the low-frequency / low-voltage load shedding control method of the high-altitude energy power station is implemented in the form of program instructions and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of software. This computer software is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present disclosure. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical discs that can store program codes.

[0033] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific identification content executed by the above-described system and device can refer to the corresponding process in the foregoing method embodiments.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A low-frequency / low-voltage load reduction control method for a plateau energy power station, applied to a plateau energy power station, the plateau energy power station includes a solar thermal power generation system, a photovoltaic power generation system, and an energy storage power generation system, characterized in that: The following steps are involved: Real-time detection of the power output of the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station, and control of the active and reactive output of the energy storage power generation system; Real-time detection of target operating parameters of energy power stations. When the target operating parameters are lower than the preset values, the active and reactive outputs of the energy storage power generation system are adjusted. Re-collect the voltage and frequency of the energy station bus. If the target operating parameters of the energy station bus are still lower than the preset values, start the low-frequency / low-voltage load reduction function and cut off the corresponding load.

2. The low-frequency / low-voltage load reduction control method of a plateau energy power station according to claim 1, characterized in that: Real-time detection of the power output of the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station, and control of the active and reactive output of the energy storage power generation system further include: The operation data of photovoltaic cell arrays, combiner boxes, and inverters are collected in real time through the remote monitoring system, and the real-time output data of the CSP generator sets of the CSP system are collected in real time through the remote monitoring system; Calculate the output data of the energy storage power generation system based on the power command issued by the dispatching master station; The active and reactive output of the energy storage power generation system is controlled based on the output data.

3. The low-frequency / low-voltage load reduction control method of a plateau energy power station according to claim 1, characterized in that: Real-time detection of target operating parameters of the energy power station, when the target operating parameters are lower than preset values, adjusting the active and reactive outputs of the energy storage power generation system further includes: Real-time detection of the voltage, frequency and power of the energy station bus; When there is frequency abnormality, low voltage, abnormal slip value, PT disconnection or manual locking of the control chassis, the low-frequency load reduction function is locked and the locking information is uploaded.

4. The low-frequency / low-voltage load reduction control method of a plateau energy power station according to claim 3, characterized in that: The frequency abnormality is: f<42Hz or f>58Hz, the low voltage is: positive sequence voltage<0.15Un rated voltage, the slip value abnormality is: df / dt≤-10Hz / s, and the PT line break is: negative sequence voltage>0.15Un rated voltage.

5. The low-frequency / low-voltage load reduction control method of a plateau energy power station according to claim 1, characterized in that: Starting the low frequency / low voltage load reduction function and removing the corresponding load further includes: The power supply priority is cut off sequentially from low to high until the target operating parameters of the energy power station bus are not lower than the preset values ​​when the corresponding load is cut off.

6. A low-frequency / low-voltage load reduction control system for a plateau energy power station, the plateau energy power station includes a solar thermal power generation system, a photovoltaic power generation system, and an energy storage power generation system, characterized in that: include: The energy storage control module is used to detect the power output of the current solar thermal power generation system and photovoltaic power generation system and the power command issued by the dispatching master station in real time, and control the active and reactive output of the energy storage power generation system; The preliminary adjustment module is used to detect the target operating parameters of the energy power station in real time. When the target operating parameters are lower than the preset values, the active and reactive outputs of the energy storage power generation system are adjusted; The load shedding module is used to re-collect the voltage and frequency of the energy station bus. If the target operating parameters of the energy station bus are still lower than the preset values, the low-frequency / low-voltage load reduction function is started to shear off the corresponding load.

7. The low frequency / low voltage load reduction control system of the plateau energy power station according to claim 6, characterized in that: The preliminary adjustment module detects the voltage, frequency and power of the energy station bus in real time; when there is frequency abnormality, low voltage, abnormal slip value, PT line break or manual locking of the control chassis, the low-frequency load reduction function is locked and the locking information is uploaded.

8. The low frequency / low voltage load reduction control system of the plateau energy power station according to claim 6, characterized in that: The energy storage control module collects the operating data of the photovoltaic cell array, combiner box, and inverter in real time through the remote monitoring system, and collects the real-time output data of the CSP generator set of the CSP system in real time through the remote monitoring system; Calculate the output data of the energy storage power generation system based on the power command issued by the dispatching master station; The active and reactive output of the energy storage power generation system is controlled based on the output data.

9. An electronic device, characterized in that: include: A memory, the memory is used to store the processing program; A processor, which implements the low-frequency / low-voltage load reduction control method for a plateau energy power station as claimed in any one of claims 1 to 7 when executing a processing program.

10. A readable storage medium, characterized in that: A processing program is stored on the readable storage medium, and when the processing program is executed by the processor, a low-frequency / low-voltage load reduction control method for a plateau energy power station as claimed in any one of claims 1 to 7 is implemented.

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