Variable-speed pumped storage unit regulation performance evaluation method, device, equipment and medium

Abstract

This invention relates to the field of new energy grid-connected regulation technology, and discloses a method, device, equipment, and medium for evaluating the regulation performance of variable-speed pumped storage units. This invention comprehensively evaluates variable-speed pumped storage units from three dimensions—power tracking accuracy, cumulative energy deviation, and response speed—by employing multiple evaluation indicators such as power deviation, assessed power output, and response delay. This overcomes the shortcomings of existing technologies that rely on a single evaluation indicator, and can more comprehensively reflect the dynamic regulation capability of the unit. Furthermore, by comparing each evaluation indicator with its corresponding preset limit range, and determining the power regulation performance evaluation result of the unit accordingly, a unified and quantitative evaluation standard is provided for variable-speed pumped storage units, making the evaluation results more objective and accurate.

Description

Technical Field

[0001] This invention relates to the field of new energy grid-connected regulation technology, specifically to a method, device, equipment, and medium for evaluating the regulation performance of variable speed pumped storage units. Background Technology

[0002] Under the new power system, the proportion of grid-connected power generation from new energy sources such as wind and solar power continues to rise. However, the instability of their output leads to increasingly severe fluctuations in grid load. Therefore, while integrating new energy sources into the grid, the power system must also have the ability to respond to rapid changes in output and load. Pumped storage, as the most mature and economical flexible energy storage technology for power systems, is an important component of the new power system. Compared with constant-speed pumped storage units, variable-speed pumped storage units have a wider power regulation range, faster response, and stronger frequency regulation capabilities, greatly enhancing the grid's ability to absorb fluctuating renewable energy sources such as wind and solar power.

[0003] Currently, variable-speed pumped-storage units have been widely adopted in the industry to ensure the safe and stable operation of power systems. However, current research on variable-speed pumped-storage units mainly focuses on unit modeling and control optimization methods. In the field of coordinated operation, most studies are based on macroscopic energy complementarity objectives, using long-term time-scale factors such as reservoir water level differences, reservoir capacity, high transmission channel utilization, cost, economic benefits, and carbon emissions as constraints to study unit response mechanisms.

[0004] Research on the service evaluation system for variable-speed pumped storage units participating in the electricity market is still insufficient, especially lacking a differentiated evaluation method that can accurately measure their regulation performance. Because the regulation characteristics of variable-speed pumped storage units differ fundamentally from those of constant-speed pumped storage units, using traditional, single technical evaluation indicators is insufficient to comprehensively and objectively reflect the actual operational value and dynamic regulation advantages of variable-speed pumped storage units. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for evaluating the regulation performance of variable speed pumped storage units, in order to solve the problems in the prior art where the evaluation indicators for the regulation performance of variable speed pumped storage units are singular, cannot fully reflect the dynamic regulation capability of the unit, and lack unified and quantitative evaluation standards.

[0006] In a first aspect, the present invention provides a method for evaluating the regulation performance of a variable-speed pumped-storage unit, comprising: acquiring operating data of the variable-speed pumped-storage unit, the operating data including a power reference value sequence and an actual power response value sequence; calculating, based on the operating data, multiple evaluation indicators for assessing the dynamic regulation performance of the variable-speed pumped-storage unit, the multiple evaluation indicators including a power deviation indicator, a test power quantity indicator, and a response delay indicator; wherein, the power deviation indicator is used to characterize the degree of deviation between the power reference value sequence and the actual power response value sequence, the test power quantity indicator is used to characterize the cumulative energy deviation between the power reference value sequence and the actual power response value sequence, and the response delay indicator is used to characterize the time lag of the actual power response value sequence relative to the power reference value sequence; comparing the multiple evaluation indicators with corresponding preset indicator limit ranges, and determining the power regulation performance evaluation result of the variable-speed pumped-storage unit based on the comparison results.

[0007] This invention employs multiple evaluation indicators, including power deviation, energy consumption, and response delay, to comprehensively evaluate variable-speed pumped-storage units from three dimensions: power tracking accuracy, cumulative energy deviation, and response speed. This overcomes the shortcomings of existing technologies that rely on a single evaluation indicator, and can more comprehensively reflect the dynamic regulation capability of the unit. Furthermore, by comparing each evaluation indicator with its corresponding preset limit range, and determining the power regulation performance evaluation result of the unit accordingly, this invention provides a unified and quantitative evaluation standard for variable-speed pumped-storage units, making the evaluation results more objective and accurate.

[0008] In one optional implementation, the operating data is obtained under at least two different renewable energy capacity ratio scenarios. By acquiring operating data under different renewable energy capacity ratio scenarios, the evaluation method of the present invention can adapt to various application scenarios with changes in the installed capacity of renewable energy sources such as wind power and photovoltaics, thereby improving the applicability and versatility of the evaluation method and providing a reliable technical means for evaluating the regulation performance of variable speed pumped storage units under different renewable energy penetration rates.

[0009] In one optional implementation, the power reference value sequence is generated based on fluctuations in renewable energy output, and the trend of the power reference value sequence is opposite to that of renewable energy output. The power reference value sequence fully reflects the target regulation command of the unit, and the trend of this command is opposite to that of renewable energy output. By comparing the actual power response value sequence with this target command, the responsiveness of the unit to dispatch demands can be accurately measured. At the same time, since the regulation command specifically balances the output fluctuations of renewable energy sources such as wind power and photovoltaics, proactive response and effective suppression of renewable energy volatility are achieved.

[0010] In one alternative implementation, the operational data is collected continuously within an evaluation period, which includes multiple sampling points at equal time intervals.

[0011] In one optional implementation, the step of calculating multiple evaluation indicators for assessing the dynamic regulation performance of a variable-speed pumped-storage unit based on operational data includes: calculating the average value and / or standard deviation of the power difference based on the power reference value sequence and the actual power response value sequence, as a power deviation indicator, which can quantify the power tracking accuracy of the unit from both the overall deviation level and the degree of deviation fluctuation; calculating the cumulative energy deviation based on the power reference value sequence, the actual power response value sequence, and the time interval of each sampling point, as an assessment energy indicator, which can intuitively reflect the total energy difference caused by power tracking deviation within the assessment period; and determining the time delay value that maximizes the correlation coefficient by calculating the correlation coefficient under different time delays based on the power reference value sequence and the actual power response value sequence, as a response delay indicator, which can accurately identify the degree of time lag of the unit's response relative to the command. This implementation provides a clear and operable calculation method for the three evaluation indicators, making the assessment of the unit's regulation performance more accurate and reliable.

[0012] In one optional implementation, the step of comparing multiple evaluation indicators with their corresponding preset indicator limit ranges and determining the power regulation performance evaluation result of the variable-speed pumped storage unit based on the comparison results includes: comparing the power deviation indicator, the test power quantity indicator, and the response delay indicator with their respective corresponding preset indicator limit ranges; if the power deviation indicator, the test power quantity indicator, and the response delay indicator are all within their respective corresponding preset indicator limit ranges, then the power regulation performance of the variable-speed pumped storage unit is determined to meet the requirements; if at least one of the power deviation indicator, the test power quantity indicator, and the response delay indicator is not within its corresponding preset indicator limit range, then the power regulation performance of the variable-speed pumped storage unit is determined to not meet the requirements.

[0013] In one optional implementation, the preset index limit range is determined based on the ratio of variable-speed pumped storage units to renewable energy capacity, with different renewable energy capacity ratios corresponding to different preset index limit ranges. By setting corresponding preset index limit ranges according to different renewable energy capacity ratios, the evaluation standard can adaptively match the objective differences in unit regulation performance under different application scenarios, avoiding the evaluation inaccuracy problem caused by using a uniform fixed standard, and further improving the scientificity and applicability of the evaluation method.

[0014] Secondly, the present invention provides a device for evaluating the regulation performance of a variable-speed pumped-storage unit, comprising: a data acquisition module for acquiring operating data of the variable-speed pumped-storage unit, the operating data including a power reference value sequence and an actual power response value sequence; an index calculation module for calculating multiple evaluation indices for assessing the dynamic regulation performance of the variable-speed pumped-storage unit based on the operating data, the multiple evaluation indices including a power deviation index, a test power quantity index, and a response delay index; wherein, the power deviation index is used to characterize the degree of deviation between the power reference value sequence and the actual power response value sequence, the test power quantity index is used to characterize the cumulative energy deviation between the power reference value sequence and the actual power response value sequence, and the response delay index is used to characterize the time lag of the actual power response value sequence relative to the power reference value sequence; and a performance evaluation module for comparing the multiple evaluation indices with corresponding preset index limit ranges, and determining the power regulation performance evaluation result of the variable-speed pumped-storage unit based on the comparison results.

[0015] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the variable speed pumped storage unit regulation performance evaluation method of the first aspect or any corresponding embodiment described above.

[0016] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the variable-speed pumped storage unit regulation performance evaluation method of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the method for evaluating the regulation performance of a variable-speed pumped storage unit according to an embodiment of the present invention. Figure 2 This is a schematic diagram comparing the power reference value sequence and the actual power response value sequence according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the output of a complementary system involving variable-speed turbines under random fluctuation conditions of wind and solar power output when the capacity ratio is 2:1 according to an embodiment of the present invention. Figure 4This is a schematic diagram of the output of the complementary system involving variable speed turbines under random fluctuation conditions of wind and solar power output when the capacity ratio is 5:1 according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the output of a complementary system involving a variable-speed turbine unit under random fluctuation conditions of wind and solar power output when the capacity ratio is 10:1 according to an embodiment of the present invention. Figure 6 This is a schematic diagram illustrating the performance evaluation range of the average power deviation according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the performance evaluation range of the power deviation standard value according to an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the evaluation range of the power performance according to an embodiment of the present invention; Figure 9 This is a structural block diagram of a variable speed pumped storage unit regulation performance evaluation device according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0021] Pumped storage hydroelectric power stations are hydroelectric power stations that pump water into an upper reservoir for energy storage. When electricity demand is low, electricity is used to pump water to the upper reservoir, converting electrical energy into the potential energy of the water and storing it. When electricity demand is high, the water is released to generate electricity, converting the potential energy of the water back into electrical energy. This achieves large-scale energy storage and on-demand regulation, and is generally used for peak shaving, frequency regulation, phase regulation, and emergency backup in the power grid. Fixed-speed generator units are rotating electric machines that can be used as both generators and motors. Under steady-state conditions, the unit's speed cannot change and operates at a constant value. Variable-speed generator units are synchronous generator-motors whose speed can be adjusted within a certain range. In the current context of a high proportion of renewable energy in the power grid, they provide stronger support for the grid. However, due to their low cost and high reliability, fixed-speed generator units will continue to exist for a long time in scenarios with stable water head and simple demand. The two types complement each other, jointly supporting the safe and stable operation of the power grid.

[0022] Currently, variable-speed pumped-storage (VPS) units have been widely adopted in the industry to ensure the safe and stable operation of power systems. However, research on the service evaluation system for VPS units participating in the power market is still insufficient, particularly lacking a differentiated evaluation method that can accurately measure their regulation performance. Because the regulation characteristics of VPS units differ fundamentally from those of constant-speed units, using traditional single technical evaluation indicators is insufficient to comprehensively and objectively reflect the actual operational value and dynamic regulation advantages of VPS units. Therefore, this invention provides a method, device, equipment, and medium for evaluating the regulation performance of VPS units. It uses three indicators—power deviation, test power, and response delay—to assess the accuracy of the VPS unit between the power reference (setpoint) and power response. This addresses the problems of existing VPS unit regulation performance evaluation indicators being too simplistic, failing to comprehensively reflect the unit's dynamic regulation capabilities, and lacking unified and quantitative evaluation standards.

[0023] The core evaluation logic of this invention is that the ability of variable speed pumped storage units to regulate new energy fluctuations is not achieved by directly measuring the output of new energy, but by indirectly evaluating the quality of the unit's tracking of regulation commands.

[0024] Specifically, grid dispatch generates power regulation commands—a power reference value sequence—that are opposite to the real-time fluctuations in the output of renewable energy sources such as wind and solar power. When renewable energy output increases, the generators are instructed to reduce output and perform pumped storage; when renewable energy output decreases, the generators are instructed to increase output and generate electricity. This reference value sequence essentially reflects the fluctuations in renewable energy and represents the regulation tasks that the generators need to perform.

[0025] The actual power output of the unit, i.e., the actual power response value sequence, represents the unit's execution result of the regulation task. By comparing the power reference value sequence with the actual power response value sequence and calculating the degree of deviation, cumulative energy deviation, and time lag between the two, the unit's tracking accuracy and response speed to regulation commands can be quantitatively evaluated. The more accurate the tracking and the faster the response, the stronger the unit's ability to balance fluctuations in renewable energy sources. Therefore, by comparing the power reference value and the actual power response value, this invention achieves an indirect and accurate evaluation of the dynamic regulation performance of variable-speed pumped storage units.

[0026] According to an embodiment of the present invention, an embodiment of a method for evaluating the regulation performance of a variable speed pumped storage unit is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] This embodiment provides a method for evaluating the regulation performance of a variable-speed pumped storage unit. Figure 1 This is a flowchart of a method for evaluating the regulation performance of a variable-speed pumped storage unit according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Obtain the operating data of the variable speed pumped storage unit. The operating data includes a power reference value sequence and an actual power response value sequence.

[0028] This step involves collecting operational data from variable-speed pumped-storage hydroelectric units, specifically two core sequences: a power reference sequence and an actual power response sequence. The power reference sequence represents the target regulation commands issued by the grid dispatch center to the variable-speed pumped-storage units, reflecting the expected output level. The actual power response sequence represents the actual active power output of the units, reflecting their true operating status. Acquiring both sequences simultaneously provides a data foundation for subsequent evaluation of the units' ability to respond to regulation commands.

[0029] The above power reference value sequence is generated based on the fluctuations in renewable energy output, and the changing trend of the power reference value sequence is opposite to the changing trend of renewable energy output.

[0030] To ensure the universality and reliability of the evaluation method, this step considers application scenarios with different installed capacity of new energy sources during data collection. Specifically, operational data is acquired under at least two different new energy capacity ratio scenarios. For example, data can be collected under different scenarios with variable speed pumped storage units and new energy capacity ratios of 2:1, 5:1, and 10:1, so that the evaluation results can adapt to various operating conditions of new energy sources and avoid the one-sidedness of evaluation conclusions under a single scenario.

[0031] During data acquisition, operational data is collected continuously within the evaluation period, which includes multiple sampling points at equal time intervals. The sampling interval can be set according to actual needs, such as 0.1 seconds, to ensure that the unit's rapid response characteristics can be captured.

[0032] For example, this embodiment selects three scenarios with variable-speed pumped storage and renewable energy capacity ratios of 2:1, 5:1, and 10:1 to analyze the regulation characteristics of variable-speed pumped storage units under different power plant scales. In the system, the power reference value is used as the setpoint input for the active power of the variable-speed pumped storage unit. For typical wind and solar power variation sequences, the opposite values ​​are used to analyze the actual performance of balancing wind and solar power variations. A comprehensive analysis is performed on the data from each time sampling point within the statistical period, such as... Figure 2 The power reference is represented by the blue curve, and the power response is represented by the pink curve.

[0033] Step S102: Based on the operating data, calculate multiple evaluation indicators for assessing the dynamic regulation performance of the variable speed pumped storage unit. The multiple evaluation indicators include power deviation index, assessment power quantity index, and response delay index. Among them, the power deviation index is used to characterize the degree of deviation between the power reference value sequence and the actual power response value sequence, the assessment power quantity index is used to characterize the cumulative energy deviation between the power reference value sequence and the actual power response value sequence, and the response delay index is used to characterize the time lag of the actual power response value sequence relative to the power reference value sequence.

[0034] The dynamic regulation capability of variable-speed pumped storage units is reflected in multiple dimensions: first, the accuracy of tracking target commands, i.e., the magnitude of the deviation between the actual output and the target value; second, the cumulative effect of the deviation over time, i.e., the total energy difference caused by inaccurate tracking over a period of time; and third, the response speed to changes in commands, i.e., the degree of time lag between the actual output and the command. The three indicators selected in this step correspond to the above three dimensions, forming an indicator system for comprehensively evaluating the unit's regulation performance from three levels: accuracy, energy, and speed.

[0035] Specifically, step S102 above includes: Step S1021: Calculate the average value and / or standard deviation of the power difference based on the power reference value sequence and the actual power response value sequence, as a power deviation index.

[0036] The power deviation index is calculated based on the power reference value sequence and the actual power response value sequence, specifically including the average power difference and / or the standard deviation of the power difference. The average power difference reflects the overall deviation level between the unit's actual output and the target command throughout the entire evaluation period; a smaller value indicates higher power tracking accuracy. The standard deviation of the power difference reflects the fluctuation of the deviation value at each sampling point relative to the average deviation; a smaller value indicates better tracking stability. The combination of these two parameters allows for a comprehensive quantification of the unit's power tracking accuracy and stability.

[0037] For example, based on the stator active power, a relative value relative to the average power adjustment setpoint is taken:

[0038] In the formula, The relative deviation of the stator active power at the i-th sampling point reflects the magnitude of the deviation between the actual power and the target power at that moment relative to the overall average deviation. The actual stator active power at the i-th sampling point is the actual active power output by the generator or motor at that moment, expressed in MW. The stator active power setpoint or target value at the i-th sampling point, in MW; The absolute deviation of the stator active power at the i-th sampling point is used to ensure that the deviation is positive and to avoid the cancellation of positive and negative deviations. The average absolute deviation of stator active power over the entire cycle serves as a normalization benchmark, reflecting the average error level of overall power tracking; N represents the total number of sampling points involved in the calculation, representing the number of observations during the entire evaluation cycle; i is the index variable for summation, ranging from 1 to N, traversing each sampling point.

[0039] Power difference (DP) represents the ratio between the absolute difference and the average power setpoint of the regulation. Therefore, the power deviation judgment criterion includes the average power difference (DP). avg ) and standard deviation (ΔP) std ), respectively represented as:

[0040] Step S1022: Calculate the cumulative energy deviation based on the power reference value sequence, the actual power response value sequence, and the time interval between each sampling point, and use it as an indicator for evaluating power consumption.

[0041] The assessment power consumption index is calculated based on the power reference value sequence, the actual power response value sequence, and the time interval between each sampling point. Specifically, it is the cumulative value of the absolute value of the power difference at each sampling point multiplied by the time interval, i.e., the cumulative energy deviation. This index directly reflects the total energy difference caused by the unit's power tracking deviation throughout the entire assessment period. The larger the assessment power consumption index, the greater the energy deviation caused by the unit's inaccurate tracking, and the greater the impact on the system's power balance.

[0042] For example, the energy consumption for assessment is defined as follows, representing the cumulative energy deviation between the reference point and the response point:

[0043] In the formula, Δt is the time interval between each sampling point, that is, the duration between two power samplings.

[0044] Step S1023: Based on the power reference value sequence and the actual power response value sequence, the correlation coefficient under different time delays is calculated to determine the time delay value that maximizes the correlation coefficient, which is then used as the response delay index.

[0045] The response delay index is calculated based on the power reference value sequence and the actual power response value sequence through correlation analysis. Specifically, by shifting the actual power response value sequence forward or backward along the time axis by different time delays, the correlation coefficient between the shifted response sequence and the reference sequence is calculated. The time delay value that maximizes the correlation coefficient is the response delay index. This index reflects the time lag of the unit's actual response relative to the target command, measured in seconds. The smaller the response delay, the faster the unit responds to dispatch commands and the more effectively it can balance fluctuations in new energy sources.

[0046] For example, the expression for the response latency metric is as follows:

[0047] In the formula, DT is the intermediate value of the delay time between 0.0 and 30.0 when the sampling time is 0.1s, and Tdelay is the final evaluation value of the delay time. This evaluation index is based on the correlation coefficient between the power reference and power response sequences and the time offset. Let be the correlation coefficient of the power sequences under delay DT, which measures the similarity between two power sequences; corr is the correlation coefficient function used to quantify the linear correlation between two signal sequences. This represents the predicted power sequence obtained by delaying the actual power response value sequence by DT. The original actual power response value sequence is shifted backward by DT time units to simulate the time offset between the predicted and actual values. This represents the predicted power sequence obtained by delaying the actual power response value sequence by Tdelay; A power reference sequence (usually a received power sequence at no delay or reference time) serves as a benchmark for comparison; Max( To find the correlation coefficient within the range of 0 ≤ DT ≤ 30. The delay value that reaches the maximum value; 0≤DT≤30 is the search range of delay time, usually in sampling points or seconds, indicating that the optimal delay is only searched within the range of 0 to 30.

[0048] Step S103: Compare multiple evaluation indicators with their corresponding preset limit ranges, and determine the power regulation performance evaluation result of the variable speed pumped storage unit based on the comparison results.

[0049] The preset index limit range is the benchmark threshold for evaluating the unit's regulation performance. This range can be determined according to the capacity ratio of the variable speed pumped storage unit and the new energy source. Different new energy source capacity ratios correspond to different preset index limit ranges.

[0050] In order to determine the preset index limit ranges applicable to different scenarios, embodiments of the present invention first construct a complementary system simulation model comprising variable-speed pumped storage units and new energy, and set three typical new energy capacity ratio scenarios in the simulation, that is, the capacity ratios of the variable-speed pumped storage unit to new energy are 2:1, 5:1 and 10:1 respectively. Simulation is performed under the working condition of random fluctuation of wind and solar output, and the total output curves of the complementary system with variable-speed units participating under different ratios are obtained, which are respectively shown in Figure 3 , Figure 4 , Figure 5 . It can be seen that under different capacity ratios, there are significant differences in the output characteristics of the complementary system. To quantify this difference and evaluate the regulation performance of the unit, this embodiment uses the evaluation index defined in the foregoing step S102 to analyze the unit response data under the foregoing three working conditions.

[0051] By calculating the power deviation index and assessed electric energy index under different capacity ratios and fitting the results, the performance evaluation range curves shown in Figure 6 , Figure 7 , Figure 8 are obtained.

[0052] wherein, Figure 6 shows the performance evaluation range of the average power deviation varying with the capacity ratio, and its fitting relational expression is y=-0.0007x 2 +0.0082x+0.1913, where y is the average power deviation and x is the capacity ratio. Figure 7 shows the performance evaluation range of the standard power deviation varying with the capacity ratio, and its fitting relational expression is y=-0.0008x 2 +0.008x+0.3671, where y is the standard power deviation and x is the capacity ratio. Figure 8 shows the performance evaluation range of the assessed electric energy varying with the capacity ratio, and its fitting relational expression is y=-0.2158x 2 -1.1825x+53.228, where y is the assessed electric energy and x is the capacity ratio. The relationship between response delay and capacity ratio is y=0.1 (2<x<10), where y is the response delay and x is the capacity ratio in the system.

[0053] The foregoing fitting curves and their relational expressions constitute the "preset index limit range" in the present invention. In practical applications, for a given new energy capacity ratio, the limit range corresponding to each evaluation index in the current scenario can be determined through the foregoing relational expression or the graph lookup method.

[0054] This step first compares the power deviation index, the assessed power quantity index, and the response delay index calculated in step S102 with their respective preset index limit ranges one by one to confirm whether each index falls within its corresponding qualified range. Then, a comprehensive judgment is made based on the comparison results. If all three indicators are within their respective preset index limit ranges, the power regulation performance of the variable-speed pumped storage unit is determined to meet the requirements; if at least one of the three indicators is outside its corresponding preset index limit range, the power regulation performance of the unit is determined to not meet the requirements.

[0055] Specifically, step S103 above includes: Step S1031: Compare the power deviation index, the assessment power index, and the response delay index with their respective preset index limit ranges.

[0056] The preset index limit range is determined based on the ratio of variable speed pumped storage units to new energy capacity. Different new energy capacity ratios correspond to different preset index limit ranges. For specific methods, please refer to the above fitting relationship.

[0057] Step S1032: If the power deviation index, the assessed power quantity index, and the response delay index are all within their respective preset index limits, then the power regulation performance of the variable speed pumped storage unit is determined to meet the requirements.

[0058] Step S1033: If at least one of the power deviation index, the assessment power index, and the response delay index is not within the limit range of its corresponding preset index, then the power regulation performance of the variable speed pumped storage unit is determined to be unsatisfactory.

[0059] By performing extreme operating condition calculations on numerical simulation models under different capacity ratios, the average power deviation boundary / standard deviation of power deviation / test power capacity is obtained. A curve relationship between the capacity ratio and the average power deviation / standard deviation of power deviation / test power capacity is fitted, and the colored area under the curve represents a reasonable capacity ratio range. In this embodiment, the extreme range is presented in the form of a curve, as described above. Figure 6 , Figure 7 , Figure 8 The performance evaluation range curves shown intuitively demonstrate the acceptable ranges for each indicator under different capacity ratios.

[0060] Three indicators are used to evaluate the responsiveness of variable-speed pumped-storage units in the ancillary services market under different capacity ratios. According to the formulas for these three indicators, units with all three indicators falling within the area under the curve have superior responsiveness, should obtain higher value in the ancillary services market, and are worthy of continued use by the grid dispatching system. Units outside the area under the curve have responsiveness that needs improvement, and their operating strategies need further optimization to meet the high-quality demands of a high-voltage power grid. As shown in the above examples, under different energy configurations, the larger the ratio of variable-speed pumped-storage to new energy capacity (i.e., the smaller the proportion of new energy), the better the control characteristics of the variable-speed unit, providing a framework for the construction of variable-speed units.

[0061] The variable-speed pumped-storage unit regulation performance evaluation method provided in this embodiment uses multiple evaluation indicators, including power deviation, assessed energy quantity, and response delay, to comprehensively evaluate the variable-speed pumped-storage unit from three dimensions: power tracking accuracy, cumulative energy deviation, and response speed. This overcomes the shortcomings of existing technologies that rely on a single evaluation indicator and can more comprehensively reflect the dynamic regulation capability of the unit. Furthermore, by comparing each evaluation indicator with its corresponding preset limit range and determining the power regulation performance evaluation result of the unit accordingly, a unified and quantitative evaluation standard is provided for variable-speed pumped-storage units, making the evaluation results more objective and accurate.

[0062] This embodiment also provides a variable-speed pumped-storage unit regulation performance evaluation device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0063] This embodiment provides a device for evaluating the regulation performance of a variable-speed pumped storage unit, such as... Figure 9 As shown, it includes: Data acquisition module 901 is used to acquire the operating data of the variable speed pumped storage unit. The operating data includes a power reference value sequence and an actual power response value sequence. The index calculation module 902 is used to calculate multiple evaluation indicators for assessing the dynamic adjustment performance of the variable speed pumped storage unit based on operating data. The multiple evaluation indicators include power deviation index, assessment power quantity index, and response delay index. Among them, the power deviation index is used to characterize the degree of deviation between the power reference value sequence and the actual power response value sequence, the assessment power quantity index is used to characterize the cumulative energy deviation between the power reference value sequence and the actual power response value sequence, and the response delay index is used to characterize the time lag of the actual power response value sequence relative to the power reference value sequence. The performance evaluation module 903 is used to compare multiple evaluation indicators with their corresponding preset limit ranges, and to determine the power regulation performance evaluation result of the variable speed pumped storage unit based on the comparison results.

[0064] The variable-speed pumped-storage unit regulation performance evaluation device provided in this embodiment of the invention can execute the variable-speed pumped-storage unit regulation performance evaluation method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the above modules and units are the same as in the corresponding embodiments described above, and will not be repeated here.

[0065] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0066] The following is a detailed reference. Figure 10 This diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 1001, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1002 or a program loaded from memory 1008 into random access memory (RAM) 1003. The RAM 1003 also stores various programs and data required for the operation of the electronic device. The processor 1001, ROM 1002, and RAM 1003 are interconnected via a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0067] Typically, the following devices can be connected to the I / O interface 1005: input devices 1006 including, for example, a touchscreen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; output devices 1007 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; memory devices 1008 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows electronic devices to exchange data via wireless or wired communication with other devices. Although Figure 10 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0068] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 1009, or installed from a memory 1008, or installed from a ROM 1002. When the computer program is executed by the processor 1001, it performs the functions defined in the variable-speed pumped-storage unit regulation performance evaluation method of the embodiments of the present invention.

[0069] Figure 10 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0070] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the variable-speed pumped-storage unit regulation performance evaluation method shown in the above embodiments is implemented.

[0071] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0072] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for evaluating the regulation performance of a variable-speed pumped storage unit, characterized in that, The method includes: Acquire operating data of the variable speed pumped storage unit, the operating data including a power reference value sequence and an actual power response value sequence; Based on the operational data, multiple evaluation indicators are calculated to assess the dynamic regulation performance of the variable-speed pumped storage unit. These indicators include a power deviation indicator, a test power quantity indicator, and a response delay indicator. The power deviation indicator characterizes the degree of deviation between the power reference value sequence and the actual power response value sequence. The test power quantity indicator characterizes the cumulative energy deviation between the power reference value sequence and the actual power response value sequence. The response delay indicator characterizes the time lag of the actual power response value sequence relative to the power reference value sequence. The multiple evaluation indicators are compared with their corresponding preset limit ranges, and the power regulation performance evaluation result of the variable speed pumped storage unit is determined based on the comparison results.

2. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 1, characterized in that, The operational data was obtained under at least two different renewable energy capacity ratio scenarios.

3. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 1, characterized in that, The power reference value sequence is generated based on the fluctuations in the output of new energy sources, and the changing trend of the power reference value sequence is opposite to the changing trend of the output of new energy sources.

4. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 1, characterized in that, The operational data is collected continuously within the evaluation period, which includes multiple sampling points at equal time intervals.

5. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 4, characterized in that, The step of calculating multiple evaluation indicators for assessing the dynamic regulation performance of the variable-speed pumped storage unit based on the operational data includes: Based on the power reference value sequence and the actual power response value sequence, calculate the average value of the power difference and / or the standard deviation of the power difference as the power deviation index; Based on the power reference value sequence and the actual power response value sequence, as well as the time interval of each sampling point, the cumulative energy deviation is calculated and used as the assessment power index. Based on the power reference value sequence and the actual power response value sequence, the time delay value that maximizes the correlation coefficient under different time delays is determined as the response delay index.

6. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 1, characterized in that, The step of comparing the multiple evaluation indicators with their corresponding preset indicator limit ranges and determining the power regulation performance evaluation result of the variable-speed pumped storage unit based on the comparison results includes: The power deviation index, the assessment power index, and the response delay index are compared with their respective preset index limit ranges. If the power deviation index, the assessed power consumption index, and the response delay index are all within their respective preset index limits, then the power regulation performance of the variable speed pumped storage unit is determined to meet the requirements. If at least one of the power deviation index, the assessment power index, and the response delay index is not within its corresponding preset index limit range, then the power regulation performance of the variable speed pumped storage unit is determined to be unsatisfactory.

7. The method for evaluating the regulation performance of a variable-speed pumped storage unit according to claim 1, characterized in that, The preset index limit range is determined based on the ratio of variable speed pumped storage units to new energy capacity, and different new energy capacity ratios correspond to different preset index limit ranges.

8. A variable speed pumped storage unit regulation performance evaluation device, characterized by, The device includes: The data acquisition module is used to acquire the operating data of the variable speed pumped storage unit, which includes a power reference value sequence and an actual power response value sequence. The indicator calculation module is used to calculate multiple evaluation indicators for assessing the dynamic adjustment performance of the variable-speed pumped storage unit based on the operating data. These multiple evaluation indicators include a power deviation indicator, a performance-based energy consumption indicator, and a response delay indicator. The power deviation indicator characterizes the degree of deviation between the power reference value sequence and the actual power response value sequence; the performance-based energy consumption indicator characterizes the cumulative energy deviation between the power reference value sequence and the actual power response value sequence; and the response delay indicator characterizes the time lag of the actual power response value sequence relative to the power reference value sequence. The performance evaluation module is used to compare the multiple evaluation indicators with the corresponding preset indicator limit ranges, and determine the power regulation performance evaluation result of the variable speed pumped storage unit based on the comparison results.

9. An electronic device, comprising: include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the variable-speed pumped storage unit regulation performance evaluation method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the variable-speed pumped storage unit regulation performance evaluation method according to any one of claims 1 to 7.

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