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CN-121984022-A - Dynamic frequency modulation control method and device for wind-light-fire-storage cooperative power generation system

CN121984022ACN 121984022 ACN121984022 ACN 121984022ACN-121984022-A

Abstract

The application relates to a dynamic frequency modulation control method and device for a wind-solar-fire-storage cooperative power generation system, wherein the method comprises the steps of collecting volumes of all levels of gas tanks in a multi-level compressor system, determining a photovoltaic output sudden drop amplitude, a gas tank pressure distribution value and initial transmission delay amount, identifying a pressure fluctuation transmission path, determining a pressure establishment path, when a delay node exists, fusing the photovoltaic output sudden drop amplitude to adjust the starting and stopping time of the compressor, reconstructing a pressure transmission sequence, evaluating output time, confirming a target pressure path and a frequency modulation control scheme, verifying the pressure transmission delay amount, determining a compensation accuracy grade, evaluating an inter-level pressure difference stable state, determining an acceleration path for the system output to reach a target value, and integrating multi-level compressor distribution information to obtain a coordinated frequency modulation output strategy. Therefore, the problems of rough pressure matching and flow distribution control, insufficient response speed, delayed pressure transmission of the gas tanks and the like of each stage of gas tanks in the related technology are solved, and accordingly the time-efficiency and stability of frequency modulation response are improved.

Inventors

  • MA DONGJIN

Assignees

  • 国家能源集团科学技术研究院有限公司

Dates

Publication Date
20260505
Application Date
20260122

Claims (10)

  1. 1. The dynamic frequency modulation control method of the wind-solar-fire-storage cooperative power generation system is characterized by comprising the following steps of: collecting volumes of all levels of gas tanks in a multi-level compressor system, obtaining a photovoltaic output value in a target time period, and determining a photovoltaic output sudden drop amplitude so as to determine pressure distribution values and initial transfer delay amounts of all levels of gas tanks; Determining a gas tank volume ratio based on the gas tank pressure distribution value of each stage and the initial transfer delay amount, evaluating inter-stage pressure difference change and identifying a pressure fluctuation transfer path to determine a pressure establishment path under the current volume ratio, wherein when a delay node exists in the pressure establishment path, the photovoltaic power-off sudden drop amplitude is fused to adjust the starting and stopping time of a compressor, and the pressure transfer sequence among the gas tanks of each stage is reconstructed; identifying a charge-discharge rate gradient from charge-discharge records of an energy storage system, integrating the start-stop time of the compressor and the pressure transfer sequence into the charge-discharge rate gradient so as to evaluate the output time of the energy storage system and confirm a target pressure path, extracting response time, and determining a frequency modulation control scheme; extracting updated volume ratio data according to a compressor start-stop time sequence in the frequency modulation control scheme, so as to verify the pressure transmission delay amount of the target pressure path and determine the compensation accuracy level; Filtering real-time pressure value noise according to the compensation accuracy grade and the sudden photovoltaic output drop amplitude, merging the pressure transmission sequence, and evaluating the steady state of the inter-stage pressure difference to determine an acceleration path of the system output reaching a target value; And integrating the multi-stage compressor distribution information by utilizing the acceleration path, and obtaining a coordinated frequency modulation output strategy of the multi-stage compressor system according to the multi-stage compressor distribution information.
  2. 2. The method of claim 1, wherein the identifying a charge-discharge rate gradient from a charge-discharge record of an energy storage system, integrating the compressor start-stop time and the pressure transfer sequence into the charge-discharge rate gradient to evaluate an output time of the energy storage system and confirm a target pressure path, extracting a response age, determining a frequency modulation control scheme, comprises: Reading a power time sequence from the charge-discharge record, calculating a power difference value at adjacent moments divided by a time interval to obtain a charge-discharge power change rate, and performing second-order calculation on the power change rate to obtain a charge-discharge rate gradient; Generating a time sequence according to the start-stop time of the compressor, constructing a connection relation table among all levels according to the pressure transmission sequence, aligning the charge-discharge rate gradient with the time sequence in time, taking the calculated rate gradient peak value and the start-stop time difference as response delays, and calculating the pressure step-by-step transmission accumulation time according to the connection relation table; calculating the total response time of the system according to the sum of the response delay and the pressure step-by-step transmission accumulation time, confirming that the pressure transmission sequence is the target pressure path, and extracting each inter-stage pressure establishment time interval as response timeliness; And generating a compressor start-stop time schedule and an inter-stage pressure coordination parameter set according to the response time effect and the target pressure path to generate the frequency modulation control scheme.
  3. 3. The method of claim 1, wherein fusing the photovoltaic power dip amplitude to adjust a compressor start-stop time when a delay node exists in the pressure build-up path, reconstructing a pressure transfer sequence between cylinders of each stage, comprises: marking a node with the pressure transmission time exceeding a delay threshold as a delay node, and extracting the delay duration time and the gas tank level number of the delay node to determine the starting advance of the compressor according to the photovoltaic output sudden drop amplitude; Correcting preset starting and stopping moments of each stage of compressor according to the starting advance of the compressors to obtain new starting moments, and sequencing from large to small according to the pressure difference between the new starting moments and the current pressure values of each stage of gas tanks to determine a starting sequence; And rearranging the pressure establishing process of each level of gas tanks according to the starting sequence, enabling the delay node to be started in priority corresponding to the compressor, and reconstructing the pressure transmission sequence among each level of gas tanks according to the starting sequence.
  4. 4. The method of claim 1, wherein the acquiring volumes of each stage of the gas tank in the multi-stage compressor system, obtaining a photovoltaic output value for a target period of time, and determining a photovoltaic output dip amplitude to determine a pressure distribution value of each stage of the gas tank and an initial transfer delay amount, comprises: reading real-time volume data of each level of gas tank to establish a volume data table according to the real-time volume data of each level of gas tank; Acquiring active power data flow of the photovoltaic inverter, detecting a power drop inflection point through a sliding window, and calculating the photovoltaic output sudden drop amplitude; And calculating the quantity of the gas substances according to the volume data table and the pressure sensor reading, and determining the pressure distribution value of each stage of gas tank and the initial transfer delay quantity.
  5. 5. The method of claim 1, wherein said filtering real-time pressure value noise based on the compensation accuracy level and the photovoltaic output dip amplitude and fusing the pressure delivery order, evaluating an inter-stage pressure differential steady state to determine an acceleration path for system output to a target value, comprises: selecting filtering parameters according to the compensation accuracy level to perform noise filtering on the real-time pressure value; time aligning the filtered pressure values according to the pressure transmission sequence, calculating a pressure difference standard deviation to evaluate fluctuation amplitude, and identifying the steady state of the pressure difference between stages; At least one key node is extracted from the target pressure path, and the acceleration path is determined according to the time interval between the at least one key node shortened according to response aging.
  6. 6. The method of claim 1, wherein integrating the multi-stage compressor profile information using the acceleration path and deriving the coordinated fm output strategy of the multi-stage compressor system based on the multi-stage compressor profile information comprises: Extracting a node time mark and a pressure value of the acceleration path, and reading parameters of the position, rated output power and maximum response speed of the compressor; Determining a compressor starting time sequence according to the time node of the acceleration path; And distributing output power proportion according to the total power demand of the system according to the starting time sequence and rated power, and generating the coordinated frequency modulation output strategy.
  7. 7. The method of claim 1, wherein the extracting updated volumetric proportioning data based on the compressor start-stop timing in the fm control scheme to perform pressure transfer delay amount verification on the target pressure path, determining a compensation accuracy level, comprises: Triggering the operation of the compressor according to the start-stop time sequence, and reading the volume value of each stage of gas tank in real time to calculate the updated volume proportioning data; recording the difference value between the actual transfer time and the theoretical transfer time to form a delay sequence; and determining the compensation accuracy grade according to the delay amount deviation range.
  8. 8. The utility model provides a scene fire stores up cooperative power generation system dynamic frequency modulation controlling means which characterized in that includes: The acquisition module is used for acquiring volumes of all levels of gas tanks in the multi-level compressor system, acquiring a photovoltaic output value of a target time period, and determining a photovoltaic output sudden drop amplitude so as to determine pressure distribution values of all levels of gas tanks and initial transfer delay quantity; the determining module is used for determining the volume ratio of the gas tanks based on the pressure distribution values of the gas tanks at all levels and the initial transfer delay amount, evaluating the inter-stage pressure difference change and identifying a pressure fluctuation transfer path so as to determine a pressure building path under the current volume ratio, wherein when delay nodes exist in the pressure building path, the photovoltaic power-out sudden drop amplitude is fused to adjust the starting and stopping time of the compressor, and the pressure transfer sequence among the gas tanks at all levels is reconstructed; the identification module is used for identifying a charge-discharge rate gradient from charge-discharge records of the energy storage system, integrating the start-stop time and the pressure transmission sequence of the compressor into the charge-discharge rate gradient so as to evaluate the output time of the energy storage system and confirm a target pressure path, extracting response timeliness and determining a frequency modulation control scheme; the extraction module is used for extracting updated volume proportioning data according to the start-stop time sequence of the compressor in the frequency modulation control scheme so as to verify the pressure transmission delay amount of the target pressure path and determine the compensation accuracy level; The evaluation module is used for filtering the real-time pressure value noise according to the compensation accuracy grade and the sudden drop amplitude of the photovoltaic output and fusing the pressure transmission sequence, and evaluating the steady state of the pressure difference between the stages so as to determine the acceleration path of the system output reaching the target value; and the control module is used for integrating the multi-stage compressor distribution information by utilizing the acceleration path and obtaining a coordinated frequency modulation output strategy of the multi-stage compressor system according to the multi-stage compressor distribution information.
  9. 9. An electronic device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, the processor executing the program to implement the method for controlling dynamic frequency modulation of a wind, solar and fire energy storage cogeneration system according to any one of claims 1-7.
  10. 10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program is executed by a processor for implementing a method of dynamic frequency modulation control of a wind-solar-fire-energy-storage cogeneration system according to any one of claims 1-7.

Description

Dynamic frequency modulation control method and device for wind-light-fire-storage cooperative power generation system Technical Field The application relates to the technical field of new energy power generation, in particular to a dynamic frequency modulation control method and device for a wind, light and fire energy storage cooperative power generation system. Background At present, the wind-solar-fire-storage cooperative power generation system has non-negligible importance for guaranteeing the stability of a power grid and the efficient utilization of energy. The system aims to realize multi-energy complementation and dynamic regulation by integrating wind energy, light energy, traditional thermal power and energy storage technologies so as to cope with challenges brought by power grid frequency fluctuation. However, how to achieve fast and accurate frequency adjustment in a complex environment is always a key issue to be broken through in the field. The existing method is often focused on improving the response speed of the energy storage device, but complex interaction among multiple components in the system cannot be fully considered, and especially when the multi-stage compression device operates cooperatively, the overall adjustment efficiency may be reduced due to the simple pursuit of the speed. The volume distribution and pressure transfer process of the gas tank in the system can obviously influence the adjusting effect, but the existing method is difficult to adapt to the dynamic change, and especially when the volume proportion of the multi-stage gas tank is unreasonable, the pressure transfer delay can cause that the output of the system cannot respond to the frequency change in time, so that the frequency modulation effect is weakened. In the related technology, two implementation schemes are mainly adopted, namely, grading gas storage and cross-grade gas supplementing frequency modulation, a multi-grade compressor is combined with a gas tank with a corresponding pressure grade, the compressor with the corresponding grade is flexibly started to store energy or release energy according to the power grid frequency deviation, and volume decompression regulation and frequency modulation is realized, namely, a high-pressure fluid is subjected to rough pressure regulation to buffer fluctuation through a switching type expansion and decompression system, and then the discharge flow is finely controlled through a valve, so that decoupling control of pressure and flow is realized, and the regulation precision is improved. However, in the related art, because pressure matching and flow distribution control of the graded gas storage and the cross-grade gas supplementing frequency modulation on each grade gas tank are rough, continuous fluctuation of the inlet pressure of the expander or poor power output continuity are caused, and the pressure is limited by mechanical inertia and system design, the response speed defect exists, so that the instantaneous frequency impact of the power grid millisecond level cannot be dealt with, the gas supplementing process is delayed due to physical lag of the dynamic balance of the gas tank volume and the pressure, the power output of the expander cannot follow a frequency modulation instruction, and improvement is needed. Disclosure of Invention The application provides a dynamic frequency modulation control method and device for a wind-solar-fire-storage cooperative power generation system, which are used for solving the problems that in the related art, pressure matching and flow distribution control of each stage of air tanks are rough, so that the continuous fluctuation of the inlet pressure of an expander or the continuity of power output are poor, the response speed is insufficient, and the physical hysteresis exists in the dynamic balance of the air tank volume and the pressure, so that the coordinated and rapid frequency modulation output of a multistage compressor system under the photovoltaic large fluctuation is realized, and the response aging and the output stability of the system are greatly improved. The embodiment of the first aspect of the application provides a dynamic frequency modulation control method of a wind-solar-fire-storage collaborative power generation system, which comprises the following steps of collecting volumes of all stages of gas tanks in a multistage compressor system, obtaining photovoltaic output values of a target time period, determining a photovoltaic output sudden drop amplitude to determine pressure distribution values and initial transfer delay amounts of all stages of gas tanks, determining gas tank volume proportion based on the pressure distribution values of all stages of gas tanks and the initial transfer delay amount, evaluating inter-stage pressure difference changes, identifying a pressure fluctuation transfer path to determine a pressure establishment path under the current volume proportion, wherein when dela