A coordinated control method and system for grid-connected new energy

Abstract

The application relates to the technical field of power control, in particular to a coordinated control method and system for grid-connected new energy, wherein the total active power P all output by grid connection sent by an AGC of a power grid dispatching end and the real-time power P s of each grid-connected new energy power station are used to calculate an active power optimization distribution value of each target hydroelectric generating set; a first instruction I1 containing the active power optimization distribution value is sent to the target hydroelectric generating set participating in compensation, so as to instruct the target hydroelectric generating set to carry out load adjustment based on the active power optimization distribution value; when a power peak appears in the new energy power station, the target hydroelectric generating set reduces the output of active power; when a power valley appears in the new energy power station, the target hydroelectric generating set increases the output of active power; thereby, the change of grid-connected power is reduced, the accommodation capacity of the power grid for new energy is improved, and the safety and stability of power grid operation are improved.

Description

Technical Field

[0001] This application relates to the field of power control technology, and in particular to a coordinated control method and system for grid connection of new energy sources. Background Technology

[0002] With the major adjustment of the energy structure, the proportion of wind power and solar power installed capacity in the power system will increase significantly.

[0003] However, due to the intermittency and instability of wind and solar resources, the output of wind and solar energy is random, intermittent and fluctuating. In addition, the constraints of power transmission channels will gradually highlight the problem of coordinated consumption of water, wind and solar energy after large-capacity new energy is connected to the grid. Furthermore, the operation and control of power plants, peak shaving of the power grid, power quality and anti-disturbance capabilities will put great pressure on the safe and stable operation of the power grid.

[0004] Therefore, the integrated operation and control technology of hydropower, wind power, photovoltaic power and energy storage will be the bottleneck to improving the grid's ability to absorb new energy. Summary of the Invention

[0005] This invention discloses a coordinated control method and system for new energy grid connection, aiming to solve the technical problem of how to carry out complementary coordinated control of hydropower, wind power, and solar power grid to improve the safety and stability of grid operation through the coordinated control method for new energy grid connection.

[0006] The above-mentioned objectives are achieved through the following technical solutions: Firstly, a coordinated control method for grid connection of new energy sources is provided, comprising: the hydropower station's coordinated control terminal receiving the total active power required for grid connection from the grid dispatching terminal's AGC. and the real-time power of each grid-connected renewable energy power station The hydropower station's coordinated control terminal uses the total active power as a basis. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated; the hydropower station coordination control terminal sends a first command to the target hydropower units. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0007] Secondly, a coordinated control system for grid connection of new energy sources is provided, including: The receiving module is used to receive the total active power required for grid connection sent by the AGC at the power grid dispatching terminal. and the real-time power of each grid-connected renewable energy power station ; The calculation module is used to calculate the total active power. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated. The sending module is used to send a first command to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0008] Thirdly, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, which, when executed by a processor, implements some or all of the steps of the coordinated control method for grid connection of new energy sources as described in the first aspect.

[0009] Fourthly, an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements some or all of the steps of a coordinated control method for grid connection of new energy sources as described in the first aspect.

[0010] Compared to the benefits of existing technologies: This invention transmits the total active power required for grid connection via the AGC (Automatic Generation Control) terminal of the power grid dispatching system. and the real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated; a first instruction containing the optimal allocation value of active power is sent to the target hydropower units participating in the compensation. This invention is used to instruct target hydropower units to adjust their load based on the optimized active power allocation value. When the power of a renewable energy power station fluctuates due to changes in wind and solar resources, the load of the target hydropower units used for compensation is adjusted by the hydropower station's coordination control terminal according to the real-time power of the renewable energy power station. This adjusts the active power of the hydropower station to meet the total active power requirements. When the renewable energy power station experiences a power peak, the target hydropower units participating in the compensation control reduce their active power output. When the renewable energy power station experiences a power trough, the target hydropower units participating in the compensation control increase their active power output. Therefore, this invention reduces the variation in grid-connected power by "peak shaving" and "valley filling" of the target hydropower units participating in the compensation, avoiding the randomness, intermittency, and fluctuation of wind and solar energy output caused by the intermittency and instability of wind and solar resources, as well as the problem of coordinated absorption of hydropower, wind, and solar power after large-capacity renewable energy is connected to the grid. This improves the grid's ability to absorb renewable energy and enhances the safety and stability of grid operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an application scenario in an embodiment of the present invention; Figure 2 This is a flowchart illustrating a coordinated control method for grid connection of new energy sources according to an embodiment of the present invention. Figure 3 This is a flowchart illustrating another coordinated control method for grid connection of new energy sources in an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the process of allocating the remaining active power to each grid-connected renewable energy power station in an embodiment of the present invention. Figure 5 This is a flowchart illustrating another coordinated control method for grid connection of new energy sources in an embodiment of the present invention; Figure 6 This is a flowchart illustrating another coordinated control method for grid connection of new energy sources in an embodiment of the present invention; Figure 7 This is a schematic diagram of the flow field in an embodiment of the present invention, showing the power plant monitoring system controlling the target hydropower unit to regulate the load. Figure 8 This is a schematic diagram of the structure of a coordinated control system for grid connection of new energy sources in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0012] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.

[0013] It should be noted that the embodiments of the present invention are described only to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention.

[0014] like Figure 1As shown, the application scenario of this invention is to bundle newly built new energy power plants with existing hydropower plants and transmit them to the national power grid. The main body of this invention can be a coordination and control system set up in the hydropower plant. Through the coordination and control system, the active power of the new energy power plant and the hydropower plant is coordinated and controlled in a complementary manner. While ensuring that the total active power remains unchanged, the active power of each new energy power plant and hydropower plant is reasonably controlled so as to smooth the fluctuation of new energy while making the maximum use of the external transmission channel to provide electricity and power support to the power grid.

[0015] This invention treats renewable energy power plants that can be connected to hydropower stations as additional, uncontrollable units within the hydropower system, and refers to these renewable energy sources, which complement hydropower and are bundled together for grid connection, as "virtual hydropower." The concept of "virtual hydropower" can be understood from two perspectives. First, the compensation from hydropower to renewable energy sources smooths the output curve of the renewable energy source, eliminates the uncontrollability of the renewable energy power plant's output, and converts "inferior" energy into high-quality electricity welcomed by the grid, thus improving the quality of renewable energy power. Second, after forming a complementary operating relationship, the renewable energy power plant and the hydropower station will be treated as a combined power source under grid dispatch. From the perspective of power generation, the renewable energy power plant can be considered as newly installed capacity of the hydropower station; from the perspective of system operation, the renewable energy power plant can also participate in grid peak shaving together with other units of the hydropower station, and like hydropower units, it no longer requires the grid to set up reserve capacity for it, thus possessing some characteristics of hydropower units.

[0016] Due to the randomness, intermittency, and volatility of wind and solar power output, coupled with the constraints of power transmission channels, the problem of coordinated consumption of hydropower, wind, and solar power will gradually become prominent after new energy projects are built and put into operation. At the same time, the grid connection of large-capacity new energy projects will put great pressure on the safe and stable operation of the power grid, including power plant operation control, grid peak shaving, power quality, and anti-disturbance capabilities. Therefore, the technical solution of this invention combines the advantages of hydropower units, such as rapid start-up and shutdown, flexible operation, large output variation amplitude, and fast response to load changes, to study a coordinated control strategy for hydropower, wind, and solar power complementarity, so as to ensure the safe operation of hydropower units and the stability of the power grid.

[0017] The grid dispatch terminal AGC (Automatic Generation Control) treats the new energy power station and the Sanbanxi hydropower station as a single power source. Given the total active power of the new energy power station and the Sanbanxi hydropower station, the control system of the hydropower station allocates and executes the power.

[0018] Example 1 like Figure 2 As shown, a coordinated control method for grid connection of new energy sources is disclosed, the method specifically including the following steps: 101. The hydropower station's coordination control terminal receives the total active power required for grid connection from the grid dispatching terminal's AGC. and the real-time power of each grid-connected renewable energy power station .

[0019] Real-time power of each grid-connected renewable energy power station It can be denoted as { , ,..., }, This indicates the number of renewable energy power plants. Total active power. = + , This indicates the active power of the hydropower station.

[0020] 102. The hydropower station's coordination and control terminal, based on the aforementioned total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated.

[0021] Based on the total active power Real-time power of each grid-connected renewable energy power station The active power of the hydropower station can be obtained. The hydropower units of a hydropower station consist of two parts: target hydropower units, which are used for load regulation, and non-target hydropower units, which are not used for load regulation.

[0022] For example, non-target hydropower units: { , ,..., }, This represents the number of non-target hydropower units. Target hydropower units: { , ,..., }, The target number of hydropower units.

[0023] The total active power of non-target hydropower units is fixed and they do not participate in load regulation. In one feasible implementation, each non-target hydropower unit operates at its maximum load limit; or, a certain step size is set, and the non-target hydropower units within the step size range are cyclically kept operating at their maximum load limit.

[0024] The total active power of the target hydropower unit varies with the fluctuation of the active power of the new energy power station and participates in load regulation.

[0025] Therefore, based on the total active power Real-time power of each grid-connected renewable energy power station To obtain the active power of the hydropower station Then, the total active power of the target hydropower units is obtained. Based on the real-time active power of the target hydropower units, the allocation value of the active power optimization for the target hydropower units participating in load regulation can be calculated. For example, if the total active power of the target hydropower units is 5000 kW, and the sum of the real-time active power of the current target hydropower units is 6000 kW, it means that due to stronger sunlight or stronger winds at the wind farm, the power generated by the photovoltaic array or wind power equipment has increased, resulting in a power peak. Therefore, the overall active power of the hydropower station should be reduced to meet the grid dispatching terminal's demand for the overall total active power. Thus, the target hydropower units participating in compensation control should reduce their active power output. The calculated active power optimization allocation value should be negative, meaning that the target hydropower units participating in compensation control should reduce their load under the current operating load condition. If the number of target hydropower units... The total optimized active power allocation value is -1000kW. If an average allocation method is adopted, the optimized active power allocation value for each target hydropower unit is -100kW. For example, if the total active power of the target hydropower units is 5000kW, and the sum of the real-time active power of the current target hydropower units is 4000kW, this indicates that due to weaker sunlight or weaker winds at the wind farm, the power output of the photovoltaic array or wind power generation equipment has decreased, resulting in a power trough. Therefore, the overall active power of the hydropower station should increase to meet the grid dispatching terminal's demand for total active power. Thus, the target hydropower units participating in compensation control should increase their active power output. The calculated optimized active power allocation value should then be positive, meaning that the target hydropower units participating in compensation control should increase their load under the current operating load condition. If the number of target hydropower units... The total optimized active power allocation value is 1000kW. If an average allocation method is adopted, the optimized active power allocation value for each target hydropower unit is 100kW. Therefore, by "peak shaving" and "valley filling" of the target hydropower units participating in compensation, the variation in grid-connected power is reduced, avoiding the randomness, intermittency, and fluctuation of wind and solar energy output caused by the intermittency and instability of wind and solar resources, as well as the problem of coordinated consumption of hydropower, wind, and solar power after the grid connection of large-capacity new energy, thereby improving the grid's capacity to absorb new energy and the safety and stability of grid operation.

[0026] 103. The hydropower station's coordination and control terminal sends a first instruction to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0027] After calculating the optimized active power allocation value through step 102 above, the hydropower station coordination control terminal (hydropower station coordination control system) sends a first command to the target hydropower unit. The first instruction This is used to instruct the target hydropower unit to adjust its load based on the optimized active power allocation value. For example, if the optimized active power allocation value is -100kW, the target hydropower unit... Received the first instruction containing the optimized active power allocation value -100kW The instruction directs the target hydroelectric unit Load regulation is carried out according to the optimized active power allocation value of -100kW, that is, the target hydropower unit The load should be reduced to meet the requirement of reducing active power by 100kW.

[0028] Therefore, the total active power required for grid connection is sent through the grid dispatching terminal AGC. and the real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated; a first instruction containing the optimal allocation value of active power is sent to the target hydropower units participating in the compensation. This invention is used to instruct target hydropower units to adjust their load based on the optimized active power allocation value. When the power of a renewable energy power station fluctuates due to changes in wind and solar resources, the load of the target hydropower units used for compensation is adjusted by the hydropower station's coordination control terminal according to the real-time power of the renewable energy power station. This adjusts the active power of the hydropower station to meet the total active power requirements. When the renewable energy power station experiences a power peak, the target hydropower units participating in the compensation control reduce their active power output. When the renewable energy power station experiences a power trough, the target hydropower units participating in the compensation control increase their active power output. Therefore, this invention reduces the variation in grid-connected power by "peak shaving" and "valley filling" of the target hydropower units participating in the compensation, avoiding the randomness, intermittency, and fluctuation of wind and solar energy output caused by the intermittency and instability of wind and solar resources, as well as the problem of coordinated absorption of hydropower, wind, and solar power after large-capacity renewable energy is connected to the grid. This improves the grid's ability to absorb renewable energy and enhances the safety and stability of grid operation.

[0029] Example 2 like Figure 3 As shown, this invention also proposes a coordinated control method for grid connection of new energy sources, specifically including the following steps: 301. The hydropower station's coordination control terminal receives the total active power required for grid connection from the grid dispatch terminal's AGC. and the real-time power of each grid-connected renewable energy power station .

[0030] 302. The hydropower station's coordination and control terminal determines whether the current control mode is the flood season mode. If the current control mode is the non-flood season mode, proceed to step 303; otherwise, proceed to step 305.

[0031] The flood season mode can be input by hydropower station operators through human-computer interaction to the hydropower station coordination and control system. In one feasible implementation, it can also be detected by sensors installed outdoors or in specific application scenarios. The detection information fed back by the sensors is analyzed to determine whether the current weather and climate conditions meet the preset flood season conditions. Then, the hydropower station coordination and control system will automatically switch the current mode to the flood season mode.

[0032] 303. Based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated.

[0033] 304. The hydropower station coordination control terminal sends a first instruction to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0034] The specific implementation methods of steps 301, 303, and 304 above can be found in steps 101, 102, and 103 of Embodiment 1, and will not be repeated here.

[0035] 305. Send a second instruction to the target hydropower unit and the non-target hydropower units. The second instruction Used to instruct the target hydropower unit and the non-target hydropower unit to operate at maximum load.

[0036] When the current control mode is "flood season" mode, the hydropower station faces flood discharge pressure, so the hydropower units no longer compensate and adjust the new energy sources, and the hydropower units generate electricity according to the maximum adjustable capacity.

[0037] In one feasible implementation, it also includes: 306. The hydropower station's coordination and control terminal determines the total active power of the hydropower station. Does the total active power requirement meet the requirements? The total active power of the hydropower station It is the sum of the active power generated by the target hydropower unit and the non-target hydropower unit when operating at maximum load.

[0038] When the current control mode is "flood season" mode, due to the pressure of flood discharge at the hydropower station, the hydropower units no longer compensate for and regulate renewable energy sources, and the hydropower units generate electricity according to their maximum adjustable capacity. However, when the target hydropower units participating in the compensation process generate electricity according to their maximum adjustable capacity, if the total active power of the hydropower station... It is still impossible to meet the total active power requirements of the power grid dispatching terminal. To meet the demand, it is necessary to adjust the active power of new energy sources to satisfy the total active power requirement of the grid dispatching terminal. The requirement. Therefore, proceed to step 307.

[0039] It should be noted that the total active power of the hydropower station It includes the total active power of all target hydropower units and all non-target hydropower units when generating electricity at their maximum adjustable capacity.

[0040] 307. If not, then based on the active power margin of each grid-connected renewable energy power station, the remaining active power will be... Allocated to various grid-connected new energy power plants; .

[0041] The remaining active power will be distributed among the renewable energy power plants using an equal margin method. Active power will be allocated according to the proportion of active power regulation margin values ​​of the power plants participating in the coordinated control; power plants with larger active power margins will receive more active power, and power plants with smaller active power margins will receive less. The predicted adjustable active power upper limit of the power plants will be used as the basis for the active power margin calculation.

[0042] like Figure 4 As shown, in one feasible implementation, based on the active power margin of each grid-connected renewable energy power station, the remaining active power is... Allocated to each grid-connected renewable energy power station, including: 30701. Calculate the active power margin value of each grid-connected renewable energy power station. The calculation formula is as follows: in, Indicates the first The active power margin of each new energy power station is increased. Indicates the first The active power margin of each new energy power station is reduced. Indicates the first Each new energy power station has an adjustable upper limit for active power. Indicates the first The lower limit of adjustable active power for each new energy power station Indicates the first Total active power generated by each new energy power station; 30702. Calculate the active power margin ratio of each grid-connected renewable energy power station based on the aforementioned active power margin value; 30703. Based on the active power margin ratio and remaining active power Calculate the active power regulation value for each grid-connected renewable energy power station; that is, allocate the remaining active power according to the active power margin ratio. Power plants with larger active power margins will be allocated more active power, while those with smaller active power margins will be allocated less. This allows for the calculation of the active power allocated to each grid-connected renewable energy power plant. For example, if all hydropower units in a hydropower station generate electricity at their maximum adjustable capacity, the total power generated will be... The total active power is 20,000 kW. The demand is 30,000 kW, which is equivalent to the surplus active power. The remaining task is 10,000 kW. This 10,000 kW will be allocated according to the active power margin ratio. If the renewable energy power plants participating in grid connection have { , ,..., The corresponding active power margin ratios are {0.2, 0.1, 0.1, 0.3, 0.3}, therefore, the remaining active power allocated to each renewable energy power station is {2000kW, 1000kW, 1000kW, 3000kW, 3000kW}. Combining this with the real-time active power of each grid-connected renewable energy power station, for example {5000kW, 3000kW, 4000kW, 2000kW, 8000kW}, the active power adjustment values ​​for each grid-connected renewable energy power station can be calculated as {-3000kW, -2000kW, -3000kW, 1000kW, -6000kW}, representing the respective active power adjustments for each renewable energy power station. The active power should be reduced by -3000kW for new energy power plants. The active power should be reduced by -2000kW for new energy power plants. The active power should be reduced by -3000kW for new energy power plants. The active power should be increased by 1000kW for new energy power plants. The active power should be reduced by -6000kW.

[0043] 30704. Send the third instruction to each grid-connected renewable energy power station. The third instruction Including the active power adjustment value, the third instruction This is used to instruct each grid-connected renewable energy power station to adjust its active power based on the active power adjustment value.

[0044] Therefore, in summary, the hydropower station's coordinated control system sends a third instruction containing the aforementioned active power adjustment values ​​to each grid-connected renewable energy power station. This instructs each grid-connected renewable energy power station to adjust its active power based on the aforementioned active power adjustment value to meet the total active power requirements. The demand.

[0045] This invention, based on the above embodiments, further identifies the current control mode. If the current control mode is determined to be the flood season mode, the target hydropower units participating in compensation will no longer participate in compensation, but will operate at maximum load and generate electricity according to the maximum adjustable capacity to meet the total power demand of the grid dispatching end, reducing the problem of grid operation safety and stability caused by the volatility of new energy power plants. If it is determined that even if all hydropower units of the hydropower station generate electricity at the maximum adjustable capacity, it still does not meet the total power demand of the grid dispatching end, then the active power of the new energy power plant will be adjusted accordingly. Based on the active power margin value of each grid-connected new energy power plant, the remaining active power will be adjusted accordingly. The allocation of active power to grid-connected renewable energy power plants is designed to balance the power generation of these plants. Power plants with larger active power margins will receive more active power, while those with smaller margins will receive less. This approach helps to balance the power output of renewable energy power plants, avoids excessive regulation that could damage the generators, reduces costs, and prevents unnecessary losses. It also ensures the output balance among renewable energy power plants, mitigating the randomness, intermittency, and volatility caused by wind and solar resources. This improves the grid's ability to absorb renewable energy and enhances the safety and stability of grid operation.

[0046] Example 3 like Figure 5 As shown, this invention also proposes another coordinated control method for grid connection of new energy sources, specifically including the following steps: 501. The hydropower station's coordinated control terminal receives the total active power load curve sent by the grid dispatch terminal's AGC. Active power load curves of various grid-connected renewable energy power plants The load curve It includes the total active power for each time period. The load curve It includes the real-time power of each grid-connected renewable energy power station at different times. .

[0047] Active power load curves of each grid-connected renewable energy power station This refers to the estimated active power for various future time periods. For ease of description, the estimated active power for each time period is considered as the real-time active power of the renewable energy power plant for each time period. For example, { , ,..., } indicates a new energy power station In each time period { , ,..., If the active power is distributed and points are added every 15 minutes, then there are 96 points in a day, i.e. 96. Similarly, the total active power load curve It also includes the total active power corresponding to each time period. .

[0048] 502. The hydropower station's coordination and control terminal automatically reads the total active power for each time period. Real-time power of each grid-connected renewable energy power station According to the total active power Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit in each time period was calculated.

[0049] Therefore, the hydropower station's coordinated control system automatically reads the total active power load curve. Active power load curves of various grid-connected renewable energy power plants The total active power corresponding to each time period included Real-time power of each grid-connected renewable energy power station Based on the total active power in each time period Real-time power of each grid-connected renewable energy power station This allows us to obtain the active power of the hydropower station at different times. Based on total active power Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit in each time period is calculated. The specific implementation method can be referred to the description of the above embodiment 1, which will not be repeated here. The only difference is that in the embodiment of the present invention, the calculation is performed separately for each time period, and the calculation is the optimal allocation value of active power for each target hydropower unit in each future time period.

[0050] 503. Send a fourth command to the target hydroelectric unit. The fourth instruction The fourth instruction includes optimized active power allocation values ​​for each time period. This is used to instruct each target hydropower unit to automatically adjust its load in each time period based on the optimized allocation of active power for each time period.

[0051] Based on the optimized active power allocation values ​​of the target hydropower units for each time period calculated in step 502 above, the hydropower station coordination and control system sends a fourth instruction to the target hydropower units. This is used to instruct the target hydropower units to adjust their load in each time period based on the optimized active power allocation value. The specific implementation method of the adjustment can be referred to the description of Embodiment 1 above, and will not be repeated here. The only difference is that in this embodiment of the invention, the adjustment is automatic in different time periods.

[0052] Therefore, embodiments of the present invention can also transmit the total active power load curve via the AGC (Automatic Generation Control) terminal of the power grid dispatching system. Active power load curves of various grid-connected renewable energy power plants By pre-setting adjustment schemes for the loads of the target hydropower units participating in compensation at hydropower stations for each time period, and pre-sending the optimized active power allocation values ​​for each time period to the corresponding target hydropower units, the intelligence level of the hydropower station's coordination and control system can be effectively improved, and the efficiency of coordination and control can be increased. At the same time, it avoids the problem of the grid dispatching terminal's AGC failing to update the total active power in a timely manner. Data errors can lead to misadjustments in the hydropower station's coordination and control system. However, this invention allows for advance planning, so even if the grid dispatching terminal's AGC malfunctions or data lags, it can automatically send adjustment commands to the corresponding target hydropower units for each time period.

[0053] Example 4 like Figure 6 As shown, this invention also proposes another coordinated control method for grid connection of new energy sources, specifically including the following steps: 601. The hydropower station's coordination control terminal receives the total active power required for grid connection from the grid dispatch terminal's AGC. and the real-time power of each grid-connected renewable energy power station .

[0054] 602. Receive the total active power required for grid connection input from operators via human-machine interface. .

[0055] 603. Determine the total active power With total active power Whether the difference between them reaches a preset threshold.

[0056] 604. If so, then based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated.

[0057] 605. The hydropower station coordination control terminal sends a first instruction to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0058] 606. Based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated. Proceed to step 605.

[0059] The specific implementation of steps 601 to 606 above can be found in steps 101 to 103 of Embodiment 1, and will not be repeated here.

[0060] It should be noted that the hydropower station coordination and control system in this embodiment of the invention also includes a plant control mode, that is, the operators input the total active power required for grid connection through human-machine interaction, which is referred to as […]. However, to avoid misadjustments due to the network control settings not being updated in a timely manner during mode switching, it is necessary to update the input values ​​in the plant control mode. Make a judgment, for example, when the total active power given by the grid dispatching terminal AGC. Input in factory control mode If the difference between the two values ​​is greater than or equal to 10MW, the control will automatically switch back to the "grid dispatch" mode, and the total active power given by the AGC at the grid dispatch terminal will be adopted. This refers to the total active power demand. When the total active power given by the grid dispatching terminal AGC... Input in factory control mode When the difference between the values ​​is less than 10MW, the switching mode is changed to plant control mode, control is transferred, and the input in plant control mode is used. As the total active power demand.

[0061] Example 5 This invention also proposes another coordinated control method for grid connection of new energy sources, which specifically includes the following steps: 701. The hydropower station's coordination control terminal receives the total active power required for grid connection from the grid dispatch terminal's AGC. and the real-time power of each grid-connected renewable energy power station .

[0062] 702. Based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated.

[0063] 703. The hydropower station coordination control terminal sends a first instruction to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0064] The specific implementation of steps 701 and 702 above can be found in steps 101 and 102 of Embodiment 1, and will not be repeated here.

[0065] like Figure 7 As shown, in one feasible implementation, step 703: instructing the target hydropower unit to perform load adjustment based on the optimized active power allocation value, specifically includes the following steps: 70301. The power plant monitoring system receives the first instruction sent by the hydropower station's coordinated control system. The optimized allocation value of active power is obtained.

[0066] 70302. Determine whether the active power optimization allocation value is positive; if yes, proceed to step 70303, otherwise proceed to step 70306.

[0067] 70303. Determine whether the target hydropower unit with the smallest unit capacity ratio coefficient is within the preset unit step size range; if yes, proceed to step 70304, otherwise proceed to step 70305.

[0068] 70304. Instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0069] 70305. Determine whether the active power output of the target hydropower unit meets the optimized active power allocation value when the load is adjusted to the upper limit of the load. If not, continue to traverse and determine whether the next target hydropower unit is within the preset unit step size range according to the unit capacity ratio coefficient from small to large. That is, return to step 70303 until the total active power output of all target hydropower units participating in the load adjustment meets the optimized active power allocation value.

[0070] 70306. Determine whether the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range. If the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range, instruct the target hydropower unit to perform load adjustment based on the active power optimization allocation value; return to step 70304.

[0071] 70307. Determine whether the active power output of the target hydropower unit when adjusting the load to the lower load limit meets the optimized active power allocation value; if the active power output of the target hydropower unit when adjusting the load to the lower load limit does not meet the optimized active power allocation value, or if the target hydropower unit with the largest unit capacity ratio coefficient is not within the preset unit step size range, then continue to traverse and determine whether the next target hydropower unit is within the preset unit step size range according to the unit capacity ratio coefficient from largest to smallest, until the total active power output of all target hydropower units participating in load adjustment meets the optimized active power allocation value.

[0072] It should be noted that the hydropower station's coordination and control system can send the first command to the target hydropower unit through the power plant's monitoring system. That is, the hydropower station's coordination and control system will send the first instruction. The optimized active power allocation value is sent to the power plant monitoring system, which then sends it to each target hydropower unit to regulate the unit load. Therefore, the entity that instructs the target hydropower units to regulate their load based on the optimized active power allocation value can be the power plant monitoring system.

[0073] To prevent frequent adjustments by generating units, this invention employs a cyclical allocation of active power setpoints for each unit. When the active power setpoint increases, units with a smaller percentage of actual active power generation relative to their maximum capacity are prioritized for load increases. Conversely, when the active power setpoint decreases, units with a larger percentage of actual active power generation relative to their maximum capacity are prioritized for load reduction. For example, if the increase in active power is within the step size range of the highest-priority unit, only that unit's active power is increased. If it exceeds the step size, the next higher-priority unit is added, until the target load is allocated. Of course, the maximum and minimum active power limits and vibration zone limitations of the generating units must be considered during the allocation process. This way, when the load fluctuation is small, only one or two units are adjusted, preventing excessively frequent adjustments and reducing the cumulative load deviation caused by multiple units participating in small load fluctuations, thus better tracking the active power setpoint.

[0074] Example 6 The above combination Figures 1-7 This application provides a detailed description of a coordinated control method for grid connection of new energy sources, based on embodiments of the present application. The following, in conjunction with... Figure 8 This document describes in detail a coordinated control system for new energy grid connection used to execute the coordinated control method for new energy grid connection provided in the embodiments of this application.

[0075] Figure 8 This is a schematic diagram of the structure of a coordinated control system for grid connection of new energy sources according to an embodiment of the present invention; see reference. Figure 8 The coordinated control system for grid connection of this new energy source includes: Receiver module 801 is used to receive the total active power required for grid connection sent by the grid dispatching terminal AGC. and the real-time power of each grid-connected renewable energy power station ; Calculation module 802 is used to calculate based on the total active power. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated. The sending module 803 is used to send a first command to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value.

[0076] This invention provides a coordinated control system for grid connection of new energy sources, corresponding to the coordinated control method for grid connection of new energy sources described in the above embodiments, and implements the corresponding functions. Since the specific implementation methods of each step of the coordinated control method for grid connection of new energy sources have been described in detail in the above embodiments, they will not be repeated here.

[0077] Example 7 like Figure 9 As shown, this embodiment of the invention also provides an electronic device, which includes a central processing unit (CPU) 901, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 902 or a program loaded from a storage portion 908 into a random access memory (RAM) 903. The RAM 903 also stores various programs and data required for system operation. The CPU 901, ROM 902, and RAM 903 are interconnected via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0078] The following components are connected to I / O interface 905: an input section 906 including a keyboard, mouse, etc.; an output section 907 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 908 including a hard disk, etc.; and a communication section 909 including a network interface card such as a LAN card, modem, etc. The communication section 909 performs communication processing via a network such as the Internet. A drive 910 is also connected to I / O interface 905 as needed. A removable medium 911, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 910 as needed so that computer programs read from it can be installed into storage section 908 as needed.

[0079] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0080] In another aspect, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements some or all of the steps of the coordinated control method for grid connection of new energy sources described in the above embodiments.

[0081] In another aspect, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements some or all of the steps of a coordinated control method for grid connection of new energy sources as described in the above embodiments.

[0082] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A coordinated control method for grid connection of new energy sources, characterized in that, include: The hydropower station's coordination control terminal receives the total active power required for grid connection from the grid dispatching terminal's AGC. and the real-time power of each grid-connected renewable energy power station ; The hydropower station's coordinated control terminal uses the total active power as a basis. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated. The hydropower station's coordination and control terminal sends a first command to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction Used to instruct the target hydropower unit to adjust the load based on the optimized active power allocation value; The instruction to the target hydropower unit to adjust the load based on the optimized active power allocation value includes: determining whether the optimized active power allocation value is positive; if so, determining whether the target hydropower unit with the smallest unit capacity ratio coefficient is within a preset unit step size range; if the target hydropower unit with the smallest unit capacity ratio coefficient is within the preset unit step size range, instructing the target hydropower unit to adjust the load based on the optimized active power allocation value; determining whether the active power output of the target hydropower unit when adjusting the load to the upper limit of the load meets the optimized active power allocation value; if the active power output of the target hydropower unit when adjusting the load to the upper limit of the load does not meet the optimized active power allocation value, or if the target hydropower unit with the smallest unit capacity ratio coefficient is not within the preset unit step size range, then continuing to traverse and determine whether the next target hydropower unit is within the preset unit step size range in ascending order of unit capacity ratio coefficient, until all target hydropower units participating in the load adjustment output... The total active power satisfies the optimized active power allocation value; if the optimized active power allocation value is negative, it is determined whether the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range; if the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range, the target hydropower unit is instructed to adjust the load based on the optimized active power allocation value; it is determined whether the active power output of the target hydropower unit when adjusting the load to the lower load limit satisfies the optimized active power allocation value; if the active power output of the target hydropower unit when adjusting the load to the lower load limit does not satisfy the optimized active power allocation value, or if the target hydropower unit with the largest unit capacity ratio coefficient is not within the preset unit step size range, the process continues to traverse and determine whether the next target hydropower unit is within the preset unit step size range according to the order of the unit capacity ratio coefficient from largest to smallest, until the total active power output of all target hydropower units participating in the load adjustment satisfies the optimized active power allocation value; The hydropower station's coordination and control terminal determines whether the current control mode is the flood season mode. If not, it then determines the total active power based on the aforementioned total active power. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated; otherwise, a second instruction is sent to the target hydropower units and non-target hydropower units. The second instruction Used to instruct the target hydropower unit and the non-target hydropower unit to operate at maximum load.

2. The coordinated control method for grid connection of new energy sources as described in claim 1, characterized in that, Also includes: The hydropower station's coordination and control terminal determines the total active power of the hydropower station. Does the total active power requirement meet the requirements? The total active power of the hydropower station It is the sum of the active power generated by the target hydropower unit and the non-target hydropower unit when operating at maximum load; If not, then based on the active power margin of each grid-connected renewable energy power station, the remaining active power will be... Allocated to various grid-connected new energy power plants; .

3. The coordinated control method for new energy grid connection as described in claim 2, characterized in that, Based on the active power margin of each grid-connected renewable energy power station, the remaining active power Allocated to each grid-connected renewable energy power station, including: The active power margin of each grid-connected renewable energy power station is calculated using the following formula: ; in, Indicates the first The active power margin of each new energy power station is increased. Indicates the first The active power margin of each new energy power station is reduced. Indicates the first Each new energy power station has an adjustable upper limit for active power. Indicates the first The lower limit of adjustable active power for each new energy power station Indicates the first Total active power generated by each new energy power station; Calculate the active power margin ratio of each grid-connected new energy power station based on the active power margin value; Based on the active power margin ratio and remaining active power Calculate the active power regulation value for each grid-connected renewable energy power station; Send the third instruction to each grid-connected renewable energy power plant The third instruction Including the active power adjustment value, the third instruction This is used to instruct each grid-connected renewable energy power station to adjust its active power based on the active power adjustment value.

4. The coordinated control method for grid connection of new energy sources as described in claim 1, characterized in that, Also includes: The hydropower station's coordinated control terminal receives the total active power load curve sent by the grid dispatch terminal's AGC. and the active power load curves of each grid-connected renewable energy power station The load curve It includes the total active power for each time period. The load curve It includes the real-time power of each grid-connected renewable energy power station at each time period. ; The hydropower station's coordination and control terminal automatically reads the total active power for each time period. Real-time power of each grid-connected renewable energy power station According to the total active power Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit in each time period is calculated; a fourth command is sent to the target hydropower unit. The fourth instruction The fourth instruction includes optimized active power allocation values ​​for each time period. This is used to instruct each target hydropower unit to automatically adjust its load in each time period based on the optimized allocation of active power for each time period.

5. The coordinated control method for new energy grid connection as described in claim 1, characterized in that, Also includes: The hydropower station's coordination and control terminal receives the total active power required for grid connection from operators via human-machine interface. Determine the total active power With total active power Whether the difference between them reaches a preset threshold, and if so, then based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated. Otherwise, based on the total active power... Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated.

6. A coordinated control system for grid connection of new energy sources, characterized in that, The system employs the coordinated control method for new energy grid connection as described in any one of claims 1-5 for control, and the system comprises: The receiving module is used to receive the total active power required for grid connection sent by the AGC at the power grid dispatching terminal. and the real-time power of each grid-connected renewable energy power station ; The calculation module is used to calculate the total active power. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit was calculated. The sending module is used to send a first command to the target hydropower unit. The first instruction Including the optimized active power allocation value, the first instruction This is used to instruct target hydropower units to adjust their load based on the optimized active power allocation value. The instruction of target hydropower units to adjust their load based on the optimized active power allocation value includes: determining whether the optimized active power allocation value is positive; if so, determining whether the target hydropower unit with the smallest unit capacity ratio coefficient is within a preset unit step size range; if the target hydropower unit with the smallest unit capacity ratio coefficient is within the preset unit step size range, instructing the target hydropower unit to adjust its load based on the optimized active power allocation value; determining whether the active power output of the target hydropower unit when adjusting its load to the upper load limit meets the optimized active power allocation value; if the active power output of the target hydropower unit when adjusting its load to the upper load limit does not meet the optimized active power allocation value, or if the target hydropower unit with the smallest unit capacity ratio coefficient is not within the preset unit step size range, then continuing to traverse and determine whether the next target hydropower unit is within the preset unit step size range in ascending order of unit capacity ratio coefficients, until a target hydropower unit is selected. The total active power output of all target hydropower units involved in load regulation satisfies the optimized active power allocation value. If the optimized active power allocation value is negative, it is determined whether the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range. If the target hydropower unit with the largest unit capacity ratio coefficient is within the preset unit step size range, the target hydropower unit is instructed to perform load regulation based on the optimized active power allocation value. It is then determined whether the active power output of the target hydropower unit when adjusting the load to the lower load limit satisfies the optimized active power allocation value. If the active power output of the target hydropower unit when adjusting the load to the lower load limit does not satisfy the optimized active power allocation value, or if the target hydropower unit with the largest unit capacity ratio coefficient is not within the preset unit step size range, the process continues to iterate through the target hydropower units in descending order of unit capacity ratio coefficient to determine whether they are within the preset unit step size range, until the total active power output of all target hydropower units involved in load regulation satisfies the optimized active power allocation value. The judgment module is used to determine whether the current control mode is the flood season mode. If not, it determines the total active power based on the above. Real-time power of each grid-connected renewable energy power station The optimal allocation value of active power for each target hydropower unit is calculated; otherwise, a second instruction is sent to the target hydropower units and non-target hydropower units. The second instruction Used to instruct the target hydropower unit and the non-target hydropower unit to operate at maximum load.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the coordinated control method for grid connection of new energy sources as described in any one of claims 1 to 5.

8. An electronic device, the device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the coordinated control method for grid connection of new energy sources as described in any one of claims 1 to 5.

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