A power plant reactive voltage control instruction mode evaluation method and system

Abstract

The application discloses a power plant reactive power voltage control instruction mode evaluation method and system, comprising: obtaining power grid historical operation data of a power plant; inputting the power grid historical operation data into a pre-constructed AVC (Automatic Voltage Control) adjustment performance evaluation model of the power plant to calculate AVC single adjustment performance evaluation indexes of the power plant; obtaining all AVC single adjustment performance evaluation indexes of the power plant in a set evaluation time range, and obtaining AVC total adjustment performance evaluation indexes of the power plant according to a pre-constructed calculation model; and determining a final evaluation result according to a pre-set evaluation index threshold and the AVC total adjustment performance evaluation indexes. Advantages: the method establishes an evaluation index, extracts power grid historical operation data in a period of time, evaluates AVC adjustment performance indexes of each power plant, gives suggestions of AVC control instruction modes of the power plant according to the advantages and disadvantages of the indexes, guides AVC closed-loop control of the power plant, and improves the reactive power voltage control effect.

Description

Technical Field

[0001] This invention relates to a method and system for evaluating reactive power and voltage control command modes in power plants, belonging to the field of power system automation technology. Background Technology

[0002] Automatic voltage control (AVC) systems automatically monitor and control the reactive voltage of the power grid. By adjusting equipment such as generators, new energy power plants, transformer taps, and capacitors, they achieve optimized distribution of reactive voltage in the power grid, ensuring safe, high-quality, and economical operation of the power grid.

[0003] The AVC system, through calculation and analysis, issues control target commands to the generators of each power plant. Currently, there are two control methods for power plant AVC: voltage command and reactive power command. In actual operation, due to differences in regulation speed and response time among power plants within the power grid, in voltage mode, power plants with faster regulation speeds generate more reactive power. Although the voltage meets the requirements, this can lead to an imbalance in reactive power regulation among power plants. Therefore, it is necessary to consider the regulation performance of each power plant in actual operation and select an appropriate control command mode. For power plants with consistently low regulation performance, the reactive power command mode is preferable. This is a problem that needs to be addressed in the closed-loop control of power plant AVC. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects existing in the operation of AVC in power plants and to provide a method and system for evaluating reactive power voltage control command modes in power plants.

[0005] To address the aforementioned technical problems, this invention provides a method for evaluating the reactive power and voltage control command mode of a power plant, comprising:

[0006] Obtain historical power grid operation data from the power plant;

[0007] Historical power grid operation data is input into a pre-built power plant AVC regulation performance evaluation model to calculate the power plant's AVC single regulation performance evaluation index.

[0008] Obtain all AVC single-cycle regulation performance evaluation indicators for the power plant within a set evaluation time range, and calculate the overall AVC regulation performance evaluation indicators for the power plant based on a pre-built calculation model.

[0009] The final evaluation result is determined based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC.

[0010] Furthermore, the historical operating data of the power grid includes:

[0011] Power plant AVC control commands, bus voltage, unit active and reactive power.

[0012] Furthermore, the power plant AVC regulation performance evaluation model is as follows:

[0013]

[0014] in, V0 and Q0 are the initial voltage values ​​of the high-voltage bus and the reactive power values ​​of the high-voltage side of the main transformer, respectively, used as performance evaluation indicators for single-cycle AVC regulation. obj S represents the target voltage value of the high-voltage side busbar of the power plant. vq Q represents the reactive power sensitivity of the power plant bus voltage to the generating unit. t Let t be the reactive power of the power plant unit, and T be the time for evaluating the performance of a single regulation.

[0015] Furthermore, the calculation model is as follows:

[0016]

[0017] Among them, C g The overall regulation performance evaluation index of AVC, N is the performance evaluation index for a single adjustment of AVC, where N is the number of instructions.

[0018] Furthermore, determining the final evaluation result based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC includes:

[0019] Obtain the pre-set evaluation threshold β, when C g When <β, the power plant's AVC assessment result is a reactive power command; otherwise, it is a voltage command. g This is the overall performance evaluation index for AVC regulation.

[0020] A power plant reactive power and voltage control command mode evaluation system includes:

[0021] The first acquisition module is used to acquire historical power grid operation data of the power plant;

[0022] The first calculation module is used to input historical power grid operation data into a pre-built power plant AVC regulation performance evaluation model to calculate the power plant's AVC single regulation performance evaluation index.

[0023] The second calculation module is used to obtain all AVC single regulation performance evaluation indicators of the power plant within a set evaluation time range, and to calculate the total AVC regulation performance evaluation indicators of the power plant based on the pre-built calculation model.

[0024] The determination module is used to determine the final evaluation result based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC.

[0025] Furthermore, the historical operating data of the power grid includes:

[0026] Power plant AVC control commands, bus voltage, unit active and reactive power.

[0027] Furthermore, the first computing module includes a first model building module.

[0028] The model used to construct the power plant AVC regulation performance evaluation model is represented as follows:

[0029]

[0030] in, V0 and Q0 are the initial voltage values ​​of the high-voltage bus and the reactive power values ​​of the high-voltage side of the main transformer, respectively, used as performance evaluation indicators for single-cycle AVC regulation. obj S represents the target voltage value of the high-voltage side busbar of the power plant. vq Q represents the reactive power sensitivity of the power plant bus voltage to the generating unit. t Let t be the reactive power of the power plant unit, and T be the time for evaluating the performance of a single regulation.

[0031] Furthermore, the second computing module includes a second model building module.

[0032] Used to construct computational models, represented as:

[0033]

[0034] Among them, C g The overall regulation performance evaluation index of AVC, N is the performance evaluation index for a single adjustment of AVC, where N is the number of instructions.

[0035] Furthermore, the determining module includes:

[0036] The second acquisition module is used to acquire the pre-set evaluation index threshold β;

[0037] The decision module is used when C g If <β, the power plant's AVC assessment result is determined to be a reactive power command; otherwise, it is determined to be a voltage command. g This is the overall performance evaluation index for AVC regulation.

[0038] The beneficial effects achieved by this invention are as follows:

[0039] This method establishes an evaluation index and evaluates the AVC regulation performance of each power plant by extracting historical power grid operation data over a period of time. Based on the quality of the index, it provides suggestions on the AVC control command mode of the power plant, guides the AVC closed-loop control of the power plant, and improves the reactive power and voltage control effect. Detailed Implementation

[0040] The present invention will be further described below with reference to embodiments. These embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0041] A method for evaluating the reactive power voltage control command mode of a power plant. The purpose of this invention is to provide suggestions on the AVC control command mode of a power plant by evaluating the AVC regulation performance. The specific steps are as follows:

[0042] Step 1: Obtain historical power grid operation data, including power plant AVC control commands, bus voltage, unit reactive power, etc.

[0043] The historical power grid operation data comes from the real-time power grid dispatch system. It can be obtained directly from the database or imported from historical data files. Typically, each operating system stores power grid operation data at 1-minute intervals, which yields the AVC command values, high-voltage bus voltage, active and reactive power output of each power plant over a period of time.

[0044] Step 2: Establish a power plant AVC regulation performance evaluation model C. Based on the obtained historical power grid operation data and the evaluation model, calculate the single-cycle AVC regulation performance evaluation index for power plant G.

[0045]

[0046] in, V0 and Q0 are the initial voltage values ​​of the high-voltage bus and the reactive power values ​​of the high-voltage side of the main transformer, respectively, used as performance evaluation indicators for single-cycle AVC regulation. obj S represents the target voltage value of the high-voltage side busbar of the power plant. vq Q represents the reactive power sensitivity of the power plant bus voltage to the generating unit. t Let t be the reactive power of the power plant unit, and T be the single adjustment performance evaluation time, where T can generally be set to 5 minutes.

[0047] Step 3: From the acquired power grid operation data, detect how many voltage regulation commands were issued by the scanning power plant G. The number of commands is N. By calculating the average, obtain the AVC regulation performance index C of the power plant G. g ;

[0048]

[0049] Step 4: Introduce the evaluation index constant β, when C g When C < β, it indicates that the overall voltage regulation tracking effect of the power plant is poor, and reactive power command mode should be adopted; when C g When ≥β, voltage command mode can be used.

[0050] In the formula, β is the threshold value for evaluating the AVC regulation performance index of the power plant, which needs to be given by the engineering setting to adapt to different power grid scenarios.

[0051] Accordingly, the present invention also provides a power plant reactive power and voltage control command mode evaluation system, comprising:

[0052] The first acquisition module is used to acquire historical power grid operation data of the power plant;

[0053] The first calculation module is used to input historical power grid operation data into a pre-built power plant AVC regulation performance evaluation model to calculate the power plant's AVC single regulation performance evaluation index.

[0054] The second calculation module is used to obtain all AVC single regulation performance evaluation indicators of the power plant within a set evaluation time range, and to calculate the total AVC regulation performance evaluation indicators of the power plant based on the pre-built calculation model.

[0055] The determination module is used to determine the final evaluation result based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC.

[0056] Furthermore, the historical operating data of the power grid includes:

[0057] Power plant AVC control commands, bus voltage, unit active and reactive power.

[0058] Furthermore, the first computing module includes a first model building module.

[0059] The model used to construct the power plant AVC regulation performance evaluation model is represented as follows:

[0060]

[0061] in, V0 and Q0 are the initial voltage values ​​of the high-voltage bus and the reactive power values ​​of the high-voltage side of the main transformer, respectively, used as performance evaluation indicators for single-cycle AVC regulation. obj S represents the target voltage value of the high-voltage side busbar of the power plant. vq Q represents the reactive power sensitivity of the power plant bus voltage to the generating unit. t Let t be the reactive power of the power plant unit, and T be the time for evaluating the performance of a single regulation.

[0062] Furthermore, the second computing module includes a second model building module.

[0063] Used to construct computational models, represented as:

[0064]

[0065] Among them, C gThe overall regulation performance evaluation index of AVC, N is the performance evaluation index for a single adjustment of AVC, where N is the number of instructions.

[0066] Furthermore, the determining module includes:

[0067] The second acquisition module is used to acquire the pre-set evaluation index threshold β;

[0068] The decision module is used when C g If <β, the power plant's AVC assessment result is determined to be a reactive power command; otherwise, it is determined to be a voltage command. g This is the overall performance evaluation index for AVC regulation.

[0069] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for evaluating reactive power and voltage control command modes in power plants, characterized in that, include: Obtain historical power grid operation data from the power plant; Historical power grid operation data is input into a pre-built power plant AVC regulation performance evaluation model to calculate the power plant's AVC single regulation performance evaluation index. Obtain all AVC single-cycle regulation performance evaluation indicators for the power plant within a set evaluation time range, and calculate the overall AVC regulation performance evaluation indicators for the power plant based on a pre-built calculation model. The final evaluation result is determined based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC. The power plant AVC regulation performance evaluation model is as follows: ； in, As an evaluation index for AVC single-cycle adjustment performance, , These are the initial voltage value of the high-voltage busbar of the power plant and the reactive power value of the high-voltage side of the main transformer, respectively. This refers to the target value of the high-voltage bus voltage at the power plant. The sensitivity of the power plant bus voltage to the reactive power of the generating units. Let t be the reactive power of the power plant units. For single-cycle performance evaluation; The calculation model is as follows: ； in, The overall regulation performance evaluation index of AVC, As an evaluation index for AVC single-cycle adjustment performance, Number of instructions; The process of determining the final evaluation result based on preset evaluation index thresholds and the overall regulation performance evaluation index of the AVC includes: Obtain the pre-set evaluation metric threshold β, when If the power plant's AVC assessment result is a reactive power command, then it is a voltage command; otherwise, it is a voltage command. This is the overall performance evaluation index for AVC regulation.

2. The power plant reactive power and voltage control command mode evaluation method according to claim 1, characterized in that, The historical power grid operation data includes: Power plant AVC control commands, bus voltage, unit active and reactive power.

3. A power plant reactive power and voltage control command mode evaluation system, characterized in that, include: The first acquisition module is used to acquire historical power grid operation data of the power plant; The first calculation module is used to input historical power grid operation data into a pre-built power plant AVC regulation performance evaluation model to calculate the power plant's AVC single regulation performance evaluation index. The second calculation module is used to obtain all AVC single regulation performance evaluation indicators of the power plant within a set evaluation time range, and to calculate the total AVC regulation performance evaluation indicators of the power plant based on the pre-built calculation model. The determination module is used to determine the final evaluation result based on the preset evaluation index threshold and the overall regulation performance evaluation index of the AVC; The first calculation module includes a first model construction module. The model used to construct the power plant AVC regulation performance evaluation model is represented as follows: ； in, As an evaluation index for AVC single-cycle adjustment performance, , These are the initial voltage value of the high-voltage busbar of the power plant and the reactive power value of the high-voltage side of the main transformer, respectively. This refers to the target value of the high-voltage bus voltage at the power plant. The sensitivity of the power plant bus voltage to the reactive power of the generating units. Let t be the reactive power of the power plant units. For single-cycle performance evaluation; The second calculation module includes a second model construction module. Used to construct computational models, represented as: ； in, The overall regulation performance evaluation index of AVC, As an evaluation index for AVC single-cycle adjustment performance, Number of instructions; The determining module includes: The second acquisition module is used to acquire the pre-set evaluation index threshold β; The determination module is used when... If the power plant's AVC assessment result is determined to be a reactive power command, then it is determined to be a voltage command. This is the overall performance evaluation index for AVC regulation.

4. The power plant reactive power and voltage control command mode evaluation system according to claim 3, characterized in that, The historical power grid operation data includes: Power plant AVC control commands, bus voltage, unit active and reactive power.

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