Wind, light, water and fire multi-source coordinated primary frequency modulation method, system, device and medium

Abstract

The application provides a wind-solar-hydro-thermal multi-source coordinated primary frequency modulation method, system, device and medium, comprising: based on the obtained frequency of each power source terminal in a wind-solar-hydro-thermal multi-type power source combined power generation system, performing power grid primary frequency modulation function implementation to determine the initial frequency modulation control gain; based on the obtained frequency of the grid connection point of the wind-solar-hydro-thermal multi-type power source combined power generation system, performing primary frequency modulation coordinated control function implementation, and determining the adjustment direction and adjustment amount of the primary frequency modulation control gain according to the initial frequency modulation control gain; and performing frequency modulation processing on each power source of the wind-solar-hydro-thermal multi-type power source combined power generation system according to the adjustment direction and adjustment amount, so that the function of the wind-solar-hydro-thermal combined power generation system participating in the primary frequency modulation of the power grid can be realized without increasing the communication network and hardware modification cost.

Description

Technical Field

[0001] This invention belongs to the field of power system operation and control technology, specifically relating to a method, system, equipment, and medium for multi-source coordinated primary frequency regulation of wind, solar, hydro, and thermal power. Background Technology

[0002] Developing new energy sources such as wind and solar power is a universal consensus in human society to address the energy crisis and environmental protection issues. In the past 20 years, wind and solar power have experienced large-scale and rapid development. Many wind, solar, thermal, and hydropower plants are connected to the grid through the same connection point (or are located close to each other and have the conditions for a unified connection point). If a combined wind-solar-hydro-thermal power generation system operates as a whole under grid dispatch instructions, it simplifies the management process of the grid dispatching department and allows different types of power sources to leverage their characteristics, achieving complementary advantages. The system as a whole appears as a well-controlled power source, thus gaining better returns in the electricity market competition. However, research on primary frequency regulation for different types of power sources is already very mature for thermal and hydropower. Current research mainly focuses on control strategies for individual power sources such as wind or solar power participating in grid primary frequency regulation. Few studies have begun to focus on the synergy of primary frequency regulation between wind and thermal power, or solar and thermal power. However, there is currently no research on the synergistic primary frequency regulation of combined wind-solar-hydro-thermal power generation systems. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention proposes a multi-source coordinated primary frequency modulation method for wind, solar, hydro, and thermal power, comprising:

[0004] A method for coordinated primary frequency modulation of multiple sources including wind, solar, hydro, and thermal power, comprising:

[0005] Based on the acquired frequency of each power source in the combined wind, solar, hydro, and thermal power generation system, the primary frequency regulation function of the power grid is implemented, and the initial frequency regulation control gain is determined.

[0006] Based on the frequency of the grid connection point of the multi-type power generation system of wind, solar, hydro and thermal power, the primary frequency regulation coordinated control function is implemented, and the adjustment direction and adjustment amount of the primary frequency regulation control gain are determined according to the initial frequency regulation control gain.

[0007] Based on the adjustment direction and adjustment amount, frequency modulation processing is performed on each power source of the combined wind, solar, hydro, and thermal power generation system.

[0008] Preferably, the primary frequency regulation function of the power grid is implemented based on the acquired terminal frequencies of each power source in the multi-type power generation system of wind, solar, hydro, and thermal power, and the initial frequency regulation control gain is determined, including:

[0009] Obtain the terminal frequencies of wind farms, photovoltaic power stations, hydropower units, and thermal power units in a multi-type power generation system combining wind, solar, hydro, and thermal power sources;

[0010] Based on the turbine terminal frequency and the rated turbine terminal frequency, the frequency difference is calculated to obtain the frequency deviation values ​​of wind farms, photovoltaic power stations, hydropower units and thermal power units;

[0011] Based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit, the primary frequency regulation function of the power grid is set to determine the initial frequency regulation control gain.

[0012] Preferably, the formula for calculating the frequency difference is as follows:

[0013] △f i =f N -f i

[0014] In the formula, △f i Let be the frequency variation of the terminal of the i-th power source in a combined wind, solar, hydro, and thermal power generation system, where i = 1, 2, 3, 4, and Δf is the frequency variation when i = 1. i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i f represents the change in the terminal frequency of the power supply of a thermal power unit. N For the rated frequency, f i Let be the measured value of the terminal frequency of the i-th power supply.

[0015] Preferably, the implementation of primary frequency regulation of the power grid based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit, and thermal power unit, and the determination of the initial frequency regulation control gain, includes:

[0016] The initial frequency regulation control output values ​​of each unit in the combined power generation system are obtained by calculating the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit and the change in the output active power of each power source.

[0017] Based on the initial frequency regulation control output value, the primary frequency regulation function of the power grid is realized for wind farms, photovoltaic power stations, hydropower units and thermal power units in the combined wind, solar, hydro and thermal power generation system, and the initial frequency regulation control gain is determined.

[0018] Preferably, the calculation formula for the primary frequency regulation of the power grid is as follows:

[0019] △P i =K i ×△f i

[0020] In the formula, △P i K represents the change in the output active power of the i-th power source. i Let Δf be the primary frequency modulation control gain of the i-th power supply. i Let f be the change in terminal frequency of the i-th power supply, where i = 1, 2, 3, 4, and when i = 1, Δf i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i This indicates the change in the terminal frequency of the power supply of a thermal power unit.

[0021] Preferably, the primary frequency regulation coordinated control function is implemented based on the frequency of the grid connection point of the multi-type power generation system (wind, solar, hydro, and thermal), determining the adjustment direction and amount of the primary frequency regulation control gain, including:

[0022] Obtain the frequency of the grid connection point for a combined wind, solar, hydro, and thermal power generation system;

[0023] Based on the frequency of the grid connection point and the rated frequency of the grid connection point, the frequency difference is calculated to obtain the frequency deviation value of the grid connection point.

[0024] Based on the grid connection point frequency deviation value, a primary frequency modulation coordinated control function is implemented to determine the adjustment direction and adjustment amount of the primary frequency modulation control gain.

[0025] Preferably, the formula for calculating the frequency difference is as follows:

[0026] △f pcc =f N -f pcc

[0027] In the formula, △f pcc f represents the frequency variation at the grid connection point of a combined wind, solar, hydro, and thermal power generation system. N For the rated frequency, f pcc The measured frequency at the grid connection point of a combined wind, solar, hydro, and thermal power generation system.

[0028] Preferably, the implementation of the primary frequency modulation coordinated control function based on the grid connection point frequency deviation value, determining the adjustment direction and adjustment amount of the primary frequency modulation control gain, includes:

[0029] Based on the frequency deviation value at the grid connection point, a primary frequency regulation and coordinated control function is implemented for a multi-type power generation system combining wind, solar, hydro, and thermal power sources.

[0030] The trend of frequency variation at the grid connection point of the combined power generation system within the control period is determined, and the determination result is obtained.

[0031] Based on the judgment result, the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system are determined;

[0032] The judgment results include: the frequency change at the grid connection point of the combined power generation system is generally increasing, generally stable, and generally decreasing.

[0033] Preferably, determining the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system based on the judgment result includes:

[0034] When the judgment result is that the frequency change of the grid connection point of the combined power generation system increases overall, the frequency regulation control gain of the control cycle is increased by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0035] When the judgment result is that the frequency change at the grid connection point of the combined power generation system is generally stable, the frequency regulation control gain of the control cycle remains unchanged.

[0036] When the judgment result is that the frequency change of the grid connection point of the combined power generation system decreases overall, the frequency regulation control gain of the control cycle is reduced by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0037] Preferably, the step of performing frequency regulation processing on each power source of the combined power generation system according to the adjustment direction and adjustment amount includes:

[0038] Based on the adjustment direction and adjustment amount, the frequency regulation control gain of each power source in the combined power generation system is updated through the primary frequency regulation coordination controller of the combined power generation system, and the updated frequency regulation control gain of each power source is obtained.

[0039] Frequency regulation is performed once based on the frequency regulation control gain updated for each power source, and the grid frequency value at the grid connection point of the multi-type power generation system (wind, solar, hydro, and thermal) is observed. When the grid frequency value at the connection point returns to a stable state, the frequency regulation process for each power source in the combined power generation system ends.

[0040] Based on the same inventive concept, this application also provides a multi-source coordinated primary frequency regulation system for wind, solar, hydro, and thermal power, comprising:

[0041] The power grid function setting module is used to implement the primary frequency regulation function of the power grid based on the acquired frequency of each generator in the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the initial frequency regulation control gain.

[0042] The frequency regulation control gain determination module is used to implement primary frequency regulation coordinated control function based on the frequency of the grid connection point of the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the adjustment direction and adjustment amount of the primary frequency regulation control gain according to the initial frequency regulation control gain.

[0043] The frequency modulation processing module is used to perform frequency modulation processing on each power source of the combined wind, solar, hydro and thermal power generation system according to the adjustment direction and adjustment amount.

[0044] Preferably, the power grid function setting module is specifically used for:

[0045] Obtain the terminal frequencies of wind farms, photovoltaic power stations, hydropower units, and thermal power units in a multi-type power generation system combining wind, solar, hydro, and thermal power sources;

[0046] Based on the turbine terminal frequency and the rated turbine terminal frequency, the frequency difference is calculated to obtain the frequency deviation values ​​of wind farms, photovoltaic power stations, hydropower units and thermal power units;

[0047] Based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit, the primary frequency regulation function of the power grid is implemented, and the initial frequency regulation control gain is determined.

[0048] Preferably, the formula for calculating the difference in the power grid function setting module is as follows:

[0049] △f i =f N -f i

[0050] In the formula, △f i Let be the frequency variation of the terminal of the i-th power source in a combined wind, solar, hydro, and thermal power generation system, where i = 1, 2, 3, 4, and Δf is the frequency variation when i = 1. i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i f represents the change in the terminal frequency of the power supply of a thermal power unit. N For the rated frequency, f i Let be the measured value of the terminal frequency of the i-th power supply.

[0051] Preferably, the power grid function setting module performs primary frequency regulation based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit, and thermal power unit, and determines the initial frequency regulation control gain, including:

[0052] The initial frequency regulation control output values ​​of each unit in the wind farm, photovoltaic power station, hydropower unit and thermal power unit are calculated based on the frequency deviation values ​​and the changes in the output active power of each power source.

[0053] Based on the initial frequency regulation control output value, the primary frequency regulation function of the power grid is realized for wind farms, photovoltaic power stations, hydropower units and thermal power units in the combined wind, solar, hydro and thermal power generation system, and the initial frequency regulation control gain is determined.

[0054] Preferably, the power grid primary frequency regulation calculation formula of the power grid function setting module is as follows:

[0055] △P i =K i ×△f i

[0056] In the formula, △P i K represents the change in the output active power of the i-th power source. i Let Δf be the primary frequency modulation control gain of the i-th power supply. i Let f be the change in terminal frequency of the i-th power supply, where i = 1, 2, 3, 4, and when i = 1, Δf i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i This indicates the change in the terminal frequency of the power supply of a thermal power unit.

[0057] Preferably, the frequency modulation control gain determination module is specifically used for:

[0058] Obtain the frequency of the grid connection point for a combined wind, solar, hydro, and thermal power generation system;

[0059] Based on the frequency of the grid connection point and the rated frequency of the grid connection point, the frequency difference is calculated to obtain the frequency deviation value of the grid connection point.

[0060] Based on the grid connection point frequency deviation value, a primary frequency modulation coordinated control function is implemented to determine the adjustment direction and adjustment amount of the primary frequency modulation control gain.

[0061] Preferably, the difference calculation formula of the frequency modulation control gain determination module is as follows:

[0062] △f pcc =f N -f pcc

[0063] In the formula, △f pccf represents the frequency variation at the grid connection point of a combined wind, solar, hydro, and thermal power generation system. N For the rated frequency, f pcc The measured frequency at the grid connection point of a combined wind, solar, hydro, and thermal power generation system.

[0064] Preferably, the frequency modulation control gain determination module performs primary frequency modulation coordinated control function based on the grid connection point frequency deviation value, determining the adjustment direction and adjustment amount of the primary frequency modulation control gain, including:

[0065] Based on the frequency deviation value at the grid connection point, a primary frequency regulation and coordinated control function is implemented for a multi-type power generation system combining wind, solar, hydro, and thermal power sources.

[0066] The trend of frequency variation at the grid connection point of the combined power generation system within the control period is determined, and the determination result is obtained.

[0067] Based on the judgment result, the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system are determined;

[0068] The judgment results include: the frequency change at the grid connection point of the combined power generation system is generally increasing, generally stable, and generally decreasing.

[0069] Preferably, the frequency regulation control gain determination module determines the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system based on the judgment result, including:

[0070] When the judgment result is that the frequency change of the grid connection point of the combined power generation system increases overall, the frequency regulation control gain of the control cycle is increased by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0071] When the judgment result is that the frequency change at the grid connection point of the combined power generation system is generally stable, the frequency regulation control gain of the control cycle remains unchanged.

[0072] When the judgment result is that the frequency change of the grid connection point of the combined power generation system decreases overall, the frequency regulation control gain of the control cycle is reduced by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0073] Preferably, the frequency modulation processing module is specifically used for:

[0074] Based on the adjustment direction and adjustment amount, the frequency regulation control gain of each power source in the combined power generation system is updated through the primary frequency regulation coordination controller of the combined power generation system, and the updated frequency regulation control gain of each power source is obtained.

[0075] Frequency regulation is performed once based on the frequency regulation control gain updated for each power source, and the grid frequency value at the grid connection point of the multi-type power generation system (wind, solar, hydro, and thermal) is observed. When the grid frequency value at the connection point returns to a stable state, the frequency regulation process for each power source in the combined power generation system ends.

[0076] Based on the same inventive concept, the present invention also provides a computer device, comprising: one or more processors;

[0077] Memory, used to store one or more programs;

[0078] When the one or more programs are executed by the one or more processors, a multi-source coordinated primary frequency modulation method for wind, solar, water, and fire as described above is implemented.

[0079] Based on the same inventive concept, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, it implements the aforementioned method for multi-source coordinated primary frequency modulation of wind, solar, water, and fire.

[0080] Compared with the closest existing technology, the present invention has the following beneficial effects:

[0081] 1. This invention provides a method, system, device, and medium for multi-source coordinated primary frequency regulation of wind, solar, hydro, and thermal power sources, comprising: setting the primary frequency regulation function of the power grid based on the acquired terminal frequencies of each power source in the multi-source coordinated power generation system of wind, solar, hydro, and thermal power sources, and determining the initial frequency regulation control gain; setting the coordinated control function of primary frequency regulation based on the acquired frequency of the grid connection point of the multi-source coordinated power generation system of wind, solar, hydro, and thermal power sources, and determining the adjustment direction and adjustment amount of the primary frequency regulation control gain; and performing frequency regulation processing on each power source in the coordinated power generation system according to the adjustment direction and adjustment amount. This invention can realize the function of coordinated participation of the multi-source coordinated power generation system of wind, solar, hydro, and thermal power sources in the primary frequency regulation of the power grid without increasing the cost of communication network and hardware modification.

[0082] 2. This invention adjusts power output in a timely manner by controlling the gain according to the different magnitudes of grid frequency deviations, enabling rapid recovery of the grid frequency after disturbances. It fully utilizes the frequency regulation potential of each power source, accelerates grid frequency recovery after disturbances, and achieves coordinated frequency regulation across multiple power sources. This is particularly important for future new power systems dominated by new energy sources. Due to the reduction of conventional power sources such as hydropower and thermal power, new power systems lack continuous and reliable frequency regulation resources, necessitating more full utilization of the frequency regulation potential of various power sources. Attached Figure Description

[0083] Figure 1 A schematic diagram of the method flow in a multi-source coordinated primary frequency regulation method, system, equipment and medium provided by the present invention;

[0084] Figure 2 A schematic diagram of a combined wind, solar, hydro, and thermal power generation system;

[0085] Figure 3 A schematic diagram of a coordinated primary frequency regulation control strategy for a combined wind, solar, hydro, and thermal power generation system;

[0086] Figure 4 A schematic diagram illustrating a method for determining the trend of power grid frequency changes;

[0087] Figure 5 This is a schematic diagram of the computational example system;

[0088] Figure 6 This is the waveform representing the power grid frequency deviation.

[0089] Figure 7 This is the waveform of the active power output from the wind farm;

[0090] Figure 8 The waveform of active power output from a photovoltaic power station;

[0091] Figure 9 This is the waveform of the active power output by the thermal power unit;

[0092] Figure 10 This invention provides a schematic diagram of the system structure of a multi-source coordinated primary frequency modulation method, system, equipment, and medium for wind, solar, water, and thermal power. Detailed Implementation

[0093] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0094] Example 1:

[0095] The present invention provides a method flow diagram of a multi-source coordinated primary frequency regulation method, system, equipment, and medium, including wind, solar, hydro, and thermal power sources, as shown below. Figure 1 As shown, it includes:

[0096] Step 1: Based on the acquired frequency of each power source in the combined wind, solar, hydro, and thermal power generation system, set the primary frequency regulation function of the power grid and determine the initial frequency regulation control gain.

[0097] Step 2: Based on the frequency of the grid connection point of the multi-type power generation system of wind, solar, hydro and thermal power, set the primary frequency regulation coordinated control function and determine the adjustment direction and adjustment amount of the primary frequency regulation control gain;

[0098] Step 3: Based on the adjustment direction and adjustment amount, perform frequency regulation processing on each power source of the combined power generation system.

[0099] Example 2:

[0100] In one optional embodiment, step 1: Based on the acquired generator frequencies of each power source in the combined wind, solar, hydro, and thermal power generation system, the primary frequency regulation function of the power grid is set, and the initial frequency regulation control gain is determined, including:

[0101] like Figure 2 The schematic diagram shown illustrates the structure of a combined wind, solar, hydro, and thermal power generation system, where these four power sources—solar, wind, thermal, and hydro—are connected to the power grid through a single grid connection point. Figure 2 In this diagram, M represents the number of photovoltaic power plants, N represents the number of wind farms, K represents the number of thermal power units, and L represents the number of hydropower units. Because the terminal voltage of photovoltaic inverters is relatively low (typically 270V or 380V), they typically require three or four voltage boosting stages to connect to the grid; therefore, the diagram uses three transformers as an example. Wind turbines have slightly higher terminal voltages than photovoltaics (typically 690V or several kilovolts), and typically require two or three voltage boosting stages to connect to the grid; therefore, the diagram uses two transformers as an example. Hydropower and thermal power units have even higher terminal voltages (typically between 10 and 30 kilovolts), and typically require one or two voltage boosting stages to connect to the grid; therefore, the diagram uses one transformer as an example. The terminal frequencies of wind farms, photovoltaic power plants, hydropower units, and thermal power units in a multi-source power generation system are obtained, and the difference is calculated using the formula Δf. i =f N -f i The frequency difference is calculated to obtain the frequency deviation value. In the difference calculation formula, Δf i f represents the frequency variation at the generator terminals of the i-th power source in a combined wind, solar, hydro, and thermal power generation system. N For the rated frequency, f i Let be the measured value of the terminal frequency of the i-th power source. Based on the obtained frequency deviation value, calculate ΔP according to the primary frequency regulation formula of the power grid. i =K i ×△f i Calculate the initial frequency regulation control output value of each unit in the combined power generation system. In the primary frequency regulation calculation formula of the power grid, ΔP i K represents the change in the output active power of the i-th power source. i Let Δf be the primary frequency modulation control gain of the i-th power supply. i Let be the frequency change at the terminal of the i-th power source. The primary frequency regulation function of the power grid is configured for the wind farm, photovoltaic power station, hydropower unit, and thermal power unit in the combined power generation system, and the initial frequency regulation control gain is set, where the initial frequency regulation control gain k for each power source is... i0Recommended values ​​given in national or industry standards can be used, such as 33 for wind farms, 50 for photovoltaic power plants, 35 for hydropower units, and 20 for thermal power units. By obtaining the turbine terminal frequency and then calculating the frequency deviation using the frequency difference formula, the turbine terminal frequency deviation value can be obtained. Based on the frequency deviation value, the primary frequency regulation function of the power grid is set, and then the frequency adjustment amount of each power source can be calculated based on the determined initial frequency regulation control gain value.

[0102] Step 2 includes:

[0103] Obtain the frequency of the grid connection point of the combined wind, solar, hydro, and thermal power generation system. Based on the frequency of the grid connection point and its rated frequency, calculate the difference Δf using the formula. pcc =f N -f pcc The frequency difference is calculated to obtain the frequency deviation value at the grid connection point. In the difference calculation formula, Δf pcc f represents the frequency variation at the grid connection point of a combined wind, solar, hydro, and thermal power generation system. N For the rated frequency, f pcc This refers to the measured frequency at the grid connection point of a combined wind, solar, hydro, and thermal power generation system. For example... Figure 3 The diagram illustrates the coordinated primary frequency regulation control strategy for a combined wind-solar-hydro-thermal power generation system. The wind farm, photovoltaic power station, thermal power unit, and hydropower unit measure the frequencies at the grid connection points of the wind farm, photovoltaic power station, thermal power unit, and hydropower unit, respectively. Each unit achieves its control output through its own primary frequency regulation controller under the influence of an initial frequency regulation control gain. The coordinated primary frequency regulation controller of the combined wind-solar-hydro-thermal power generation system measures the grid connection point frequency of the combined power generation system and then calculates the frequency over one control cycle (T). new The frequency change of the grid connection point within the range is based on Figure 4 The frequency change trend judgment method shown determines how to update the primary frequency regulation control gain of wind farms, photovoltaic power plants, thermal power units, and hydropower units. The new primary frequency regulation control gain values ​​for wind farms, photovoltaic power plants, thermal power units, and hydropower units are as follows: Figure 3 Zhong K wind new, K PV new, K coal new, K hydro As shown in the new diagram. Based on the obtained frequency deviation value, the primary frequency regulation coordinated control function is set up for the multi-type power generation system combining wind, solar, hydro, and thermal power through software functions, such as... Figure 4 The diagram illustrates a method for determining the trend of power grid frequency changes. Figure 4 The black curve represents the grid connection frequency of the combined wind, solar, hydro, and thermal power generation system. T0 is the initial moment of the first control cycle. newTo control the frequency change of the combined power generation system's grid connection point, a trend is calculated using data within the control period. The result is used to determine the frequency change. When the result indicates an overall increase in the frequency change, the frequency regulation control gain for the control period is increased by a corresponding factor based on a preset adjustment range. When the result indicates a stable frequency change, the frequency regulation control gain remains unchanged. When the result indicates a decrease in the frequency change, the frequency regulation control gain is decreased by a corresponding factor based on a preset adjustment range. The frequency change Δf of the combined power generation system's grid connection point is measured within a control period T. new The internal trends are categorized into three types: overall upward, overall stable, and overall downward. These three types of trends will be determined using the following calculation method: The control period T... new Divide the time interval into two equal parts. Calculate the average value of Δf over the first half of the time interval, denoted as Δf1; then calculate the average value of Δf over the second half of the time interval, denoted as Δf2. If... If the frequency change is small, the frequency modulation gain remains unchanged in the next control cycle; if If the frequency changes, the frequency modulation gain in the next control cycle will be adjusted upwards / downwards to 1.5 times that of the previous control cycle; if If the frequency increase is considered large, the frequency modulation gain in the next control cycle will be adjusted upwards / downwards to twice that of the previous control cycle; if If the frequency increase is considered large, the frequency regulation gain in the next control cycle will be adjusted upwards / downwards to 2.5 to 3 times that of the previous control cycle. In the case of a multi-power combined wind, solar, hydro, and thermal power generation system, the primary frequency regulation co-control controller issues new control commands in cycle T. new This value is generally between 5 and 15 seconds, and the specific value is determined based on the actual communication situation of the on-site joint power generation system.

[0104] The following is a specific calculation example of a multi-source (wind, solar, hydro, and thermal) coordinated primary frequency regulation method. The example system applying this method is as follows: Figure 5 As shown.

[0105] Figure 5 Taking wind power, photovoltaic wind power and thermal power as examples, a multi-type power source combined power generation system is formed. Figure 5This example uses wind power (referred to as wind power in the diagram), photovoltaic wind power (referred to as photovoltaic in the diagram), and thermal power (referred to as thermal power in the diagram) to form a multi-type power generation system. These three power sources are connected to the same busbar and then connected to the rest of the power system through two transmission lines (line 1 and line 2). This example system includes two equivalent loads (load 1 and load 2), connected to the beginning and end of the transmission lines, respectively. This example system is used to test the effectiveness of the coordinated primary frequency regulation method disclosed in this invention.

[0106] Figure 6 The waveform at the grid connection point of the combined wind, solar, hydro, and thermal power generation system is shown. It can be seen that the frequency deviation is effectively reduced after adopting the coordinated primary frequency regulation method disclosed in this invention. Among other things, Figure 6 The horizontal axis, Time (s), represents time, and the vertical axis, Frequency deviation, represents the power grid frequency deviation. Figure 6 The two curves in the attached figure represent the curves corresponding to the conventional control strategy and the curves corresponding to the control strategy disclosed in this invention.

[0107] The simulation condition set here is: load 1 suddenly increases by 10% at the 10th second. The control cycle is set to 10 seconds. The simulation time is 100 seconds. From the 10th second to the 90th second, the frequency change percentages calculated for the 8 control cycles are: 19%, 3.7%, 1%, 1.5%, 0.8%, 0.3%, 0.1%, and 0.01%. Therefore, starting from the 20th second, the control gain is adjusted (increased to twice the initial value). In subsequent control cycles, because the frequency change is small, the control gain remains unchanged.

[0108] Figure 7 , Figure 8 , Figure 9 The waveforms show the active power output from wind farms, photovoltaic power plants, and thermal power units, respectively. At the 20-second mark, the active power output of each power source was adjusted significantly in a timely manner, effectively supporting the restoration of the grid frequency.

[0109] Figure 6-9In this diagram, "Active power output of wind farm" represents the active power output of the wind farm; "Active power output of PV plant" represents the active power output of the photovoltaic power plant; "Active power output of thermal unit" represents the active power output of the thermal power unit; "Frequency deviation" represents the grid frequency deviation; the attached curves "Conventional control strategy" and "Proposed control strategy" represent the curves corresponding to the conventional control strategy and the control strategy disclosed in this invention, respectively. By calculating the trend of frequency changes at the grid connection point of the combined power generation system, the frequency change trend of the grid connection point within a cycle can be grasped. Based on the obtained frequency change trend, the frequency regulation control gain value of the grid connection point can be adjusted accordingly, ensuring timely and accurate regulation of the power supply frequency and guaranteeing the efficient operation of the combined power generation system.

[0110] Step 3 includes:

[0111] The simulation system, composed of wind power, photovoltaic power, thermal power, and the rest of the power system connected by lines, updates the frequency regulation control gain of each power source in the combined power generation system according to the adjustment direction and amount, through the primary frequency regulation co-controller of the combined power generation system. The updated frequency regulation control gain of each power source is obtained, and then primary frequency regulation is performed based on the obtained updated frequency regulation control gain of each power source. The grid frequency value at the grid connection point of the combined wind, solar, hydro, and thermal power generation system is observed. When the grid connection point frequency value returns to a stable state, the frequency regulation process for each power source in the combined power generation system ends. Here, the grid connection point frequency of the combined wind, solar, hydro, and thermal power generation system returning to a stable state refers to the grid connection point frequency value f... pcc Its steady-state value f pcc_s The difference is less than 2% or 5% of the steady-state value f pcc_s At that time, that is: or Based on the adjustment direction and amount of the obtained frequency regulation control gain, the frequency regulation control gain of each power source can be updated, thereby completing the frequency regulation of the power source. By observing the grid frequency value at the grid connection point of the multi-type power generation system of wind, solar, hydro, and thermal power, it is convenient to determine the power source frequency regulation status in real time, thereby ensuring the smooth completion of the frequency regulation task.

[0112] Example 3:

[0113] Based on the same inventive concept, this invention also provides a schematic diagram of a multi-source coordinated primary frequency regulation system for wind, solar, hydro, and thermal power, as shown below. Figure 10 ,include:

[0114] The power grid function setting module is used to implement the primary frequency regulation function of the power grid based on the acquired terminal frequencies of each power source in the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the initial frequency regulation control gain.

[0115] The frequency regulation control gain determination module is used to implement primary frequency regulation coordinated control function based on the frequency of the grid connection point of the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the adjustment direction and adjustment amount of the primary frequency regulation control gain according to the initial frequency regulation control gain.

[0116] The frequency modulation processing module is used to perform frequency modulation processing on each power source of the combined wind, solar, hydro and thermal power generation system according to the adjustment direction and adjustment amount.

[0117] Specifically, the power grid function setting module is used for:

[0118] Obtain the terminal frequencies of wind farms, photovoltaic power stations, hydropower units, and thermal power units in a multi-type power generation system combining wind, solar, hydro, and thermal power sources;

[0119] Based on the turbine terminal frequency and the rated turbine terminal frequency, the frequency difference is calculated to obtain the frequency deviation values ​​of wind farms, photovoltaic power stations, hydropower units and thermal power units;

[0120] Based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit, the primary frequency regulation function of the power grid is implemented, and the initial frequency regulation control gain is determined.

[0121] The formula for calculating the frequency difference of the power grid function setting module is as follows:

[0122] △f i =f N -f i

[0123] In the formula, △f i Let be the frequency variation of the terminal of the i-th power source in a combined wind, solar, hydro, and thermal power generation system, where i = 1, 2, 3, 4, and Δf is the frequency variation when i = 1. i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i f represents the change in the terminal frequency of the power supply of a thermal power unit. N For the rated frequency, f i Let be the measured value of the terminal frequency of the i-th power supply.

[0124] The power grid function setting module, based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit, and thermal power unit, sets the primary frequency regulation function of the power grid and determines the initial frequency regulation control gain, including:

[0125] The initial frequency regulation control output values ​​of each unit in the wind farm, photovoltaic power station, hydropower unit and thermal power unit are calculated based on the frequency deviation values ​​and the changes in the output active power of each power source.

[0126] Based on the initial frequency regulation control output value, the primary frequency regulation function of the power grid is realized for wind farms, photovoltaic power stations, hydropower units and thermal power units in the combined wind, solar, hydro and thermal power generation system, and the initial frequency regulation control gain is determined.

[0127] The power grid primary frequency regulation calculation formula of the power grid function setting module is as follows:

[0128] △P i =K i ×△f i

[0129] In the formula, △P i K represents the change in the output active power of the i-th power source. i Let Δf be the primary frequency modulation control gain of the i-th power supply. i Let f be the change in terminal frequency of the i-th power supply, where i = 1, 2, 3, 4, and when i = 1, Δf i Δf represents the change in the terminal frequency of the wind farm's power supply when i = 2. i Δf represents the change in the terminal frequency of the photovoltaic power plant's power supply when i = 3. i Δf represents the change in the terminal frequency of the hydroelectric generator power supply when i = 4. i This indicates the change in the terminal frequency of the power supply of a thermal power unit.

[0130] Specifically, the frequency modulation control gain determination module is used for:

[0131] Obtain the frequency of the grid connection point for a combined wind, solar, hydro, and thermal power generation system;

[0132] Based on the frequency of the grid connection point and the rated frequency of the grid connection point, the frequency difference is calculated to obtain the frequency deviation value of the grid connection point.

[0133] Based on the grid connection point frequency deviation value, a primary frequency modulation coordinated control function is implemented to determine the adjustment direction and adjustment amount of the primary frequency modulation control gain.

[0134] The frequency difference calculation formula for the frequency modulation control gain determination module is as follows:

[0135] △fpcc =f N -f pcc

[0136] In the formula, △f pcc f represents the frequency variation at the grid connection point of a combined wind, solar, hydro, and thermal power generation system. N For the rated frequency, f pcc The measured frequency at the grid connection point of a combined wind, solar, hydro, and thermal power generation system.

[0137] The frequency modulation control gain determination module, based on the grid connection point frequency deviation value, performs primary frequency modulation coordinated control function to determine the adjustment direction and amount of the primary frequency modulation control gain, including:

[0138] Based on the frequency deviation value at the grid connection point, a primary frequency regulation and coordinated control function is implemented for a multi-type power generation system combining wind, solar, hydro, and thermal power sources.

[0139] The trend of frequency variation at the grid connection point of the combined power generation system within the control period is determined, and the determination result is obtained.

[0140] Based on the judgment result, the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system are determined;

[0141] The judgment results include: the frequency change at the grid connection point of the combined power generation system is generally increasing, generally stable, and generally decreasing.

[0142] The frequency regulation control gain determination module, based on the judgment result, determines the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system, including:

[0143] When the judgment result is that the frequency change of the grid connection point of the combined power generation system increases overall, the frequency regulation control gain of the control cycle is increased by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0144] When the judgment result is that the frequency change at the grid connection point of the combined power generation system is generally stable, the frequency regulation control gain of the control cycle remains unchanged.

[0145] When the judgment result is that the frequency change of the grid connection point of the combined power generation system decreases overall, the frequency regulation control gain of the control cycle is reduced by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located.

[0146] Specifically, the frequency modulation processing module is used for:

[0147] Based on the adjustment direction and adjustment amount, the frequency regulation control gain of each power source in the combined power generation system is updated through the primary frequency regulation coordination controller of the combined power generation system, and the updated frequency regulation control gain of each power source is obtained.

[0148] Frequency regulation is performed based on the updated frequency regulation control gains of each power source. The grid frequency value at the grid connection point of the multi-power generation system (wind, solar, hydro, and thermal) is observed. When the grid frequency value at the connection point stabilizes, the frequency regulation process for each power source in the combined power generation system ends. From a control perspective, the frequency regulation control gains of each power source can be adjusted promptly according to different changes in grid frequency, fully utilizing the frequency regulation potential of each power source and accelerating the recovery of grid frequency after disturbances. This provides strong support for grid frequency stability and achieves coordinated frequency regulation of multiple power sources without increasing the cost of hardware and communication network upgrades.

[0149] Example 4:

[0150] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby realizing the steps of the multi-source coordinated primary frequency modulation method for wind, solar, water, and thermal power in the above embodiments.

[0151] Example 5:

[0152] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the multi-source coordinated primary frequency modulation method for wind, solar, hydro, and thermal power in the above embodiments.

[0153] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0154] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0155] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0156] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the application. However, all such changes, modifications or equivalent substitutions are within the scope of protection of the claims pending approval.

Claims

1. A method for coordinated primary frequency modulation of multiple sources including wind, solar, hydro, and thermal power, characterized in that, include: Based on the acquired terminal frequencies of each power source in a multi-type power generation system combining wind, solar, hydro, and thermal power, the primary frequency regulation function of the power grid is implemented, and the initial frequency regulation control gain is determined, including: Obtain the terminal frequencies of wind farms, photovoltaic power stations, hydropower units, and thermal power units in a multi-type power generation system combining wind, solar, hydro, and thermal power sources; Based on the turbine terminal frequency and the rated turbine terminal frequency, the frequency difference is calculated to obtain the frequency deviation values ​​of wind farms, photovoltaic power stations, hydropower units and thermal power units; Based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit, the primary frequency regulation function of the power grid is set, and the initial frequency regulation control gain is determined. Based on the frequency of the grid connection point of the multi-type power generation system (wind, solar, hydro, and thermal), a primary frequency regulation coordinated control function is implemented. The adjustment direction and amount of the primary frequency regulation control gain are determined according to the initial frequency regulation control gain, including: Obtain the frequency of the grid connection point for a combined wind, solar, hydro, and thermal power generation system; Based on the frequency of the grid connection point and the rated frequency of the grid connection point, the frequency difference is calculated to obtain the frequency deviation value of the grid connection point. Based on the adjustment direction and amount, frequency modulation processing is performed on each power source of the combined wind, solar, hydro, and thermal power generation system, including: Based on the frequency deviation value at the grid connection point, a primary frequency regulation and coordinated control function is implemented for a multi-type power generation system combining wind, solar, hydro, and thermal power sources. The trend of frequency variation at the grid connection point of the combined power generation system within the control period is determined, and the determination result is obtained. Based on the judgment result, the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system are determined, including: When the judgment result is that the frequency change of the grid connection point of the combined power generation system increases overall, the frequency regulation control gain of the control cycle is increased by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located. When the judgment result is that the frequency change at the grid connection point of the combined power generation system is generally stable, the frequency regulation control gain of the control cycle remains unchanged. When the judgment result is that the frequency change of the grid connection point of the combined power generation system decreases overall, the frequency regulation control gain of the control cycle is reduced by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located. The judgment results include: the frequency change at the grid connection point of the combined power generation system is generally increasing, generally stable, and generally decreasing.

2. The method as described in claim 1, characterized in that, The formula for calculating the frequency difference is as follows: In the formula, Let be the frequency variation of the terminal of the i-th power source in a combined wind, solar, hydro, and thermal power generation system, where i = 1, 2, 3, 4, and when i = 1. This represents the change in the terminal frequency of the wind farm's power supply, when i=2. This represents the change in the terminal frequency of the photovoltaic power plant's power supply, when i=3. This represents the change in the terminal frequency of the hydroelectric generator power supply, when i=4. This indicates the change in the terminal frequency of the power supply of a thermal power unit. For the rated frequency, Let be the measured value of the terminal frequency of the i-th power supply.

3. The method as described in claim 1, characterized in that, The implementation of primary frequency regulation of the power grid based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit, and thermal power unit, and the determination of the initial frequency regulation control gain, includes: The initial frequency regulation control output values ​​of each unit in the combined power generation system are obtained by calculating the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit and the change in the output active power of each power source. Based on the initial frequency regulation control output value, the primary frequency regulation function of the power grid is realized for wind farms, photovoltaic power stations, hydropower units and thermal power units in the combined wind, solar, hydro and thermal power generation system, and the initial frequency regulation control gain is determined.

4. The method as described in claim 3, characterized in that, The formula for calculating the primary frequency regulation of the power grid is as follows: In the formula, Let be the change in the output active power of the i-th power source. Let be the primary frequency modulation control gain of the i-th power supply. Let be the change in terminal frequency of the i-th power supply, where i = 1, 2, 3, 4, and when i = 1... This represents the change in the terminal frequency of the wind farm's power supply, when i=2. This represents the change in the terminal frequency of the photovoltaic power plant's power supply, when i=3. This represents the change in the terminal frequency of the hydroelectric generator power supply, when i=4. This indicates the change in the terminal frequency of the power supply of a thermal power unit.

5. The method as described in claim 1, characterized in that, The formula for calculating the frequency difference is as follows: In the formula, For the frequency variation at the grid connection point of a combined wind, solar, hydro, and thermal power generation system, For the rated frequency, The measured frequency at the grid connection point of a combined wind, solar, hydro, and thermal power generation system.

6. The method as described in claim 1, characterized in that, The step of performing frequency regulation processing on each power source of the combined power generation system according to the adjustment direction and adjustment amount includes: Based on the adjustment direction and adjustment amount, the frequency regulation control gain of each power source in the combined power generation system is updated through the primary frequency regulation coordination controller of the combined power generation system, and the updated frequency regulation control gain of each power source is obtained. Frequency regulation is performed once based on the frequency regulation control gain updated for each power source, and the grid frequency value at the grid connection point of the combined wind, solar, hydro, and thermal power generation system is observed. When the grid frequency value at the grid connection point returns to a stable state, the frequency regulation process for each power source in the combined power generation system ends.

7. A multi-source coordinated primary frequency regulation system for wind, solar, hydro, and thermal power, characterized in that, include: The power grid function setting module is used to implement the primary frequency regulation function of the power grid based on the acquired terminal frequencies of each power source in the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the initial frequency regulation control gain. The frequency regulation control gain determination module is used to implement primary frequency regulation coordinated control function based on the frequency of the grid connection point of the multi-type power generation system of wind, solar, hydro and thermal power, and to determine the adjustment direction and adjustment amount of the primary frequency regulation control gain according to the initial frequency regulation control gain. The frequency modulation processing module is used to perform frequency modulation processing on each power source of the combined wind, solar, hydro and thermal power generation system according to the adjustment direction and adjustment amount. Specifically, the power grid function setting module is used for: Obtain the terminal frequencies of wind farms, photovoltaic power stations, hydropower units, and thermal power units in a multi-type power generation system combining wind, solar, hydro, and thermal power sources; Based on the turbine terminal frequency and the rated turbine terminal frequency, the frequency difference is calculated to obtain the frequency deviation values ​​of wind farms, photovoltaic power stations, hydropower units and thermal power units; Based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit and thermal power unit, the primary frequency regulation function of the power grid is implemented, and the initial frequency regulation control gain is determined. The frequency modulation control gain determination module is specifically used for: Obtain the frequency of the grid connection point for a combined wind, solar, hydro, and thermal power generation system; Based on the frequency of the grid connection point and the rated frequency of the grid connection point, the frequency difference is calculated to obtain the frequency deviation value of the grid connection point. Based on the frequency deviation value at the grid connection point, a primary frequency modulation coordinated control function is implemented to determine the adjustment direction and amount of the primary frequency modulation control gain. The frequency modulation control gain determination module performs primary frequency modulation coordinated control based on the grid connection point frequency deviation value, determining the adjustment direction and amount of the primary frequency modulation control gain, including: Based on the frequency deviation value at the grid connection point, a primary frequency regulation and coordinated control function is implemented for a multi-type power generation system combining wind, solar, hydro, and thermal power sources. The trend of frequency variation at the grid connection point of the combined power generation system within the control period is determined, and the determination result is obtained. Based on the judgment result, the adjustment direction and adjustment amount of the primary frequency regulation control gain of each power source in the combined power generation system are determined, including: When the judgment result is that the frequency change of the grid connection point of the combined power generation system increases overall, the frequency regulation control gain of the control cycle is increased by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located. When the judgment result is that the frequency change at the grid connection point of the combined power generation system is generally stable, the frequency regulation control gain of the control cycle remains unchanged. When the judgment result is that the frequency change of the grid connection point of the combined power generation system decreases overall, the frequency regulation control gain of the control cycle is reduced by a corresponding multiple according to the preset adjustment range in which the frequency change of the grid connection point of the combined power generation system is located. The judgment results include: the frequency change at the grid connection point of the combined power generation system is generally increasing, generally stable, and generally decreasing.

8. The system as described in claim 7, characterized in that, The power grid function setting module implements the primary frequency regulation function of the power grid based on the frequency deviation values ​​of the wind farm, photovoltaic power station, hydropower unit, and thermal power unit, and determines the initial frequency regulation control gain, including: The initial frequency regulation control output values ​​of each unit in the wind farm, photovoltaic power station, hydropower unit and thermal power unit are calculated based on the frequency deviation values ​​and the changes in the output active power of each power source. Based on the initial frequency regulation control output value, the primary frequency regulation function of the power grid is realized for wind farms, photovoltaic power stations, hydropower units and thermal power units in the combined wind, solar, hydro and thermal power generation system, and the initial frequency regulation control gain is determined.

9. The system as described in claim 7, characterized in that, The frequency modulation processing module is specifically used for: Based on the adjustment direction and adjustment amount, the frequency regulation control gain of each power source in the combined power generation system is updated through the primary frequency regulation coordination controller of the combined power generation system, and the updated frequency regulation control gain of each power source is obtained. Frequency regulation is performed once based on the frequency regulation control gain updated for each power source, and the grid frequency value at the grid connection point of the combined wind, solar, hydro, and thermal power generation system is observed. When the grid frequency value at the grid connection point returns to a stable state, the frequency regulation process for each power source in the combined power generation system ends.

10. A computer device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, a multi-source coordinated primary frequency modulation method for wind, solar, hydro, and thermal power as described in any one of claims 1 to 6 is implemented.

11. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements a multi-source coordinated primary frequency modulation method for wind, solar, water, and fire as described in any one of claims 1 to 6.

Images