Virtual power plant regulation capability evaluation device and method

Abstract

The invention discloses a virtual power plant regulation capability evaluation device and method, and the device comprises the steps: controlling a high-precision collection module to work through a main controller, so as to carry out the data collection, namely, controlling the high-precision collection module to achieve the high-precision, high-frequency and wide-threshold data collection; and performing multi-dimensional evaluation, including acquisition precision analysis, adjustment capacity analysis, adjustment rate analysis, adjustment precision analysis, response time analysis and acquisition precision analysis, on the adjustment capability of the virtual power plant according to the electric power parameter signal through the main controller, thereby realizing high-precision, high-frequency and wide-threshold data acquisition. And real-time data processing and comprehensive analysis are carried out, so that the requirements of dynamic adjustment and performance evaluation of the virtual power plant are met.

Description

Technical Field

[0001] The present invention relates to the technical field of virtual power plants, and in particular to a device and method for evaluating the regulation capability of a virtual power plant. Background Art

[0002] With the large-scale development of renewable energy, virtual power plants, as a platform for integrating multiple distributed energy sources such as wind energy, solar energy, and energy storage and optimizing scheduling, have been widely used in modern power systems.

[0003] The regulation capability and response speed of virtual power plants directly affect the stability and reliability of the power grid. The existing evaluation of the regulation performance of virtual power plants usually relies on traditional power quality analyzers and manual analysis methods. Power quality analyzers are used to monitor basic power parameters such as voltage, current, frequency, and power in the power grid, but they only focus on the detection and analysis of the operation quality of the power grid. They are unable to process and comprehensively analyze data in real time, and the data collection accuracy and frequency are low, making it difficult to meet the needs of dynamic regulation and multi-dimensional evaluation of virtual power plants. Summary of the invention

[0004] The main purpose of the present invention is to provide an evaluation device for the regulation capability of a virtual power plant, aiming to solve the problems of low acquisition accuracy and single dimension analysis of power quality data that cannot meet the dynamic regulation and multi-dimensional evaluation needs of virtual power plants.

[0005] In order to achieve the above object, the present invention proposes a device for evaluating the regulation capability of a virtual power plant, the device comprising: A high-precision acquisition module, which is used to perform high-precision acquisition of power parameter values ​​of the virtual power plant during operation and output corresponding power parameter signals; A main controller, wherein the main controller is connected to the high-precision acquisition module, and the main controller is also connected to the remote master station system through the wireless communication module. The main controller is used to control the operation of the high-precision acquisition module, and to perform a multi-dimensional evaluation of the virtual power plant regulation capability according to the power parameter signal, and is also used to transmit the power reference value and the multi-dimensional evaluation results to the remote master station system.

[0006] In one embodiment, the main controller comprises: An acquisition accuracy analysis module, the acquisition accuracy analysis module is used to compare and analyze the power parameter value corresponding to the power parameter signal with the power reference value; The regulation capability analysis module is used to perform regulation capacity analysis, regulation rate analysis, regulation accuracy analysis and response time analysis on the virtual power plant according to the power parameter signal.

[0007] In one embodiment, the main controller further includes a storage module, and the storage module is used to store power parameter data and analysis data.

[0008] In one embodiment, the high-precision acquisition module includes a current transformer and a voltage transformer.

[0009] The present invention also proposes a method for evaluating the regulation capability of a virtual power plant, which is applied to the above-mentioned device for evaluating the regulation capability of a virtual power plant. The method for evaluating the regulation capability of a virtual power plant comprises the following steps: Obtain power parameter signals of the virtual power plant; The regulation capability of the virtual power plant is evaluated in multiple dimensions according to the power parameter signals.

[0010] In one embodiment, the multi-dimensional evaluation includes regulation capacity analysis, regulation rate analysis, regulation accuracy analysis, response time analysis and acquisition accuracy analysis.

[0011] The technical solution of the present invention first controls the high-precision acquisition module to perform data acquisition through the main controller, that is, controls the high-precision acquisition module to realize high-precision, high-frequency and wide-range data acquisition; then the main controller performs multi-dimensional evaluation on the virtual power plant regulation capability according to the power parameter signal, including acquisition accuracy analysis, regulation capacity analysis, regulation rate analysis, regulation accuracy analysis, response time analysis and acquisition accuracy analysis, thereby realizing high-precision, high-frequency and wide-range data acquisition, real-time data processing and comprehensive analysis, so as to meet the needs of dynamic regulation and performance evaluation of virtual power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall block diagram of the device for evaluating the regulation capability of a virtual power plant according to the present invention; Figure 2 A schematic diagram of a regulation capacity test of a device for evaluating the regulation capability of a virtual power plant according to the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0017] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Since the existing evaluation of the regulation performance of virtual power plants usually relies on traditional power quality analyzers and manual analysis methods, it only focuses on the detection and analysis of the power grid operation quality, and is unable to process and comprehensively analyze data in real time. In addition, the data collection accuracy and frequency are low, which makes it difficult to meet the needs of dynamic regulation and multi-dimensional evaluation of virtual power plants.

[0020] In order to solve the above problems, the present invention proposes a device for evaluating the regulation capability of a virtual power plant. The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-2 As shown, the evaluation device for the regulation capability of the virtual power plant includes: A high-precision acquisition module, which is used to perform high-precision acquisition of power parameter values ​​of the virtual power plant during operation and output corresponding power parameter signals; A main controller, wherein the main controller is connected to the high-precision acquisition module, and the main controller is also connected to the remote master station system through the wireless communication module. The main controller is used to control the operation of the high-precision acquisition module, and to perform a multi-dimensional evaluation of the virtual power plant regulation capability according to the power parameter signal, and is also used to transmit the power reference value and the multi-dimensional evaluation results to the remote master station system.

[0022] In one embodiment, the main controller comprises: An acquisition accuracy analysis module, the acquisition accuracy analysis module is used to compare and analyze the power parameter value corresponding to the power parameter signal with the power reference value; The regulation capability analysis module is used to perform regulation capacity analysis, regulation rate analysis, regulation accuracy analysis and response time analysis on the virtual power plant according to the power parameter signal.

[0023] In one embodiment, the main controller further includes a storage module, and the storage module is used to store power parameter data and analysis data.

[0024] In one embodiment, the high-precision acquisition module includes a current transformer and a voltage transformer.

[0025] In order to improve the accuracy of data acquisition, in this embodiment, 64 times oversampling technology and 1.6K sampling rate are first used to collect the power parameter values ​​of the virtual power plant, and then the three-phase voltage and current signals are digitized by high-performance ADC (Analog-to-Digital Converter), and then FIR (Finite Impulse Response filter) is used to suppress high-frequency noise. Among them, the high-precision acquisition module is equipped with 14 channels, and the three-phase voltage, current, and zero-sequence voltage and current are accurately measured through voltage transformers and current transformers. The effective value accuracy of voltage and current is 1‰, the phase angle accuracy is 2‰, the three-phase power factor accuracy is 2‰, and the apparent power, active power and reactive power accuracy are 5‰; through differential amplification and filtering shaping technology, the independent frequency measurement channel can measure the grid frequency in real time with an accuracy of ±0.01Hz. In addition, the acquisition of high-order harmonics uses 8 times oversampling and 12.8K sampling rate, supports original waveform sampling data, harmonic spectrum analysis and waveform display, and harmonic analysis can help monitor and optimize harmonic pollution in the power grid; among them, the system's high-order harmonic measurement accuracy is 0.5%. This embodiment uses a high-precision acquisition module to achieve high-precision, high-frequency, and wide-range value data acquisition, improves the accuracy and frequency of power parameter acquisition, can capture rapid changes in the virtual power plant regulation process, ensures data reliability and accuracy, and provides a basis for later analysis of the virtual power plant regulation performance; and records and stores harmonics and sampled waveforms in real time to provide data support for subsequent higher-order power quality analysis.

[0026] In this embodiment, the main controller includes a regulation capability analysis module, an acquisition accuracy analysis module and a storage module; wherein, the regulation capability analysis module is used to perform multi-dimensional power quality data analysis, which can cover multiple key performance indicators such as regulation capacity, regulation rate, regulation accuracy, response time, etc.; the acquisition accuracy analysis module is used to compare and analyze the collected power parameter values ​​with the power reference values ​​of the user platform in the same period to verify the accuracy of the collected data, and to determine whether the data meets the expected requirements by analyzing the deviations of various power parameters; the storage module is used to store the collected power parameter values ​​and analysis results, which uses a local database to store data, and each time the collected data is uniquely identified by a test user number, to achieve independent storage and traceability of the data, thereby achieving a comprehensive evaluation of the regulation capability of the virtual power plant, meeting the needs of dynamic regulation and multi-dimensional evaluation of the virtual power plant, and optimizing the management and decision-making of the power system.

[0027] In this embodiment, the main controller transmits data with the high-precision acquisition module through the USB channel, and has a link detection and timeout retransmission mechanism to ensure the reliability of data transmission; and communicates with the remote master station system through the 4G / 5G network, which supports DLT1867 and IEC104 specifications, and uploads the data collected on-site to the remote master station system in real time for subsequent centralized management and analysis, so that the monitoring of the regulation performance of the virtual power plant can be centrally managed across geographical restrictions, which is convenient for the performance evaluation and scheduling decisions of large-scale virtual power plants. The efficiency and manageability of the regulation performance evaluation of virtual power plants are improved through remote data transmission, which is helpful for the regulation performance monitoring and unified scheduling decisions of virtual power plants in multiple locations.

[0028] In this implementation, the testing process of the evaluation device for the regulation capability of the virtual power plant includes: 1. Device placement and connection: Place the detection end at the user's electricity meter and ensure that it is consistent with the power line connected to the user's electricity meter, that is, connect it to the power grid through sensors such as current transformers and voltage transformers to monitor key power parameters such as voltage, current, power factor, and frequency in the power grid in real time; the interface and connection method of the device must match the power data line collected by the meter to ensure synchronous data collection and consistency.

[0029] 2. Create a new test account number and configure parameters: Start the device to enter the system and create a new test account number as the unique identifier of the test data. The staff enters the relevant information of the test account number through the background system. This process ensures that each test has a clear identification, which is convenient for subsequent data storage, analysis and comparison. The same user can test multiple times and record them separately. In addition, the staff can also configure the remote master station address in the system to allow the test data to be transmitted to the remote master station system through the 4G / 5G network.

[0030] 3. Issue the start collection command: After entering the relevant information, the staff starts the collection and begins the data collection process. The main controller activates the high-precision collection module to collect power parameters such as voltage, current, power factor, and frequency in real time.

[0031] 4. Data storage and remote transmission during the test: During the test, the high-precision acquisition module sends the power parameter data to the main controller in real time. When the main controller receives the data, the system stores it in the local database for management. Each data collection is associated with a specific test account number to ensure the independence and traceability of the data. In this way, not only can the data of each test user be effectively managed, but also the clarity and accuracy of the data source can be guaranteed in subsequent analysis. The device has a real-time query function. The staff can view the currently collected data at any time through the interface and decide whether to transmit it remotely according to the configuration. If remote transmission is configured, it will be remotely transmitted to the remote master station system through the power transmission specification (IEC104 and DL / T 1867). It can transmit real-time and historical data to realize remote monitoring and analysis, which is convenient for cross-regional data management and analysis.

[0032] The evaluation device for the regulation capability of a virtual power plant of the present invention first controls the operation of a high-precision acquisition module through a main controller to perform data acquisition, that is, controls the high-precision acquisition module to realize data acquisition with high precision, high frequency and wide range; and then performs a multi-dimensional evaluation of the regulation capability of the virtual power plant according to the power parameter signal through the main controller, including acquisition accuracy analysis, regulation capacity analysis, regulation rate analysis, regulation accuracy analysis, response time analysis and acquisition accuracy analysis, thereby realizing data acquisition with high precision, high frequency and wide range, real-time data processing and comprehensive analysis, so as to meet the needs of dynamic regulation and performance evaluation of virtual power plants.

[0033] The present invention also proposes a method for evaluating the regulation capability of a virtual power plant. The method for evaluating the regulation capability of a virtual power plant is applied to the above-mentioned device for evaluating the regulation capability of a virtual power plant. The method for evaluating the regulation capability of a virtual power plant comprises the following steps: Obtain power parameter signals of the virtual power plant; The regulation capability of the virtual power plant is evaluated in multiple dimensions according to the power parameter signals.

[0034] In one embodiment, the multi-dimensional evaluation includes regulation capacity analysis, regulation rate analysis, regulation accuracy analysis, response time analysis and acquisition accuracy analysis.

[0035] In this embodiment, the specific steps of the adjustment capacity analysis, adjustment rate analysis, adjustment accuracy analysis, response time analysis and acquisition accuracy analysis methods are as follows: 1. Data accuracy analysis method: a. Calculate deviation: Compare the collected power parameter data with the reference data provided by the platform in the same time period, compare the two sets of data, and calculate the deviation value of each power parameter at the same time: deviation = collected value - reference value; b. Analysis results: mean, standard deviation and maximum deviation of statistical deviation, to determine whether the deviation is within the allowable range; c. Generate verification report: Generate a verification report and save it as an electronic file.

[0036] 2. Adjustment capacity test method: a. Power upper limit test: Set power: Set the user power to the upper limit value; Start collection: start the collection and analysis module; Run test: Keep the power at the upper limit and run the test for a fixed duration; Stop collection: After the test duration is over, stop collecting and save the data.

[0037] b. Power lower limit test: Set power: Set the user power to the lower limit; Start collection: start the collection and analysis module again; Run the test: Keep the power at the lower limit and run the test for the same duration; Stop collection: After the test duration is over, stop collecting and save the data.

[0038] c. Data processing: Extract the power value at the same offset time from the collected data of the two tests, and the upper limit power value P upper (t) and the lower power value P lower (t).

[0039] d. Calculate the capacity curve: For each offset time, calculate the power difference (capacity), capacity (t) = P upper (t)−P lower (t), the capacity data is plotted against time to show the capacity change trend.

[0040] 3. Adjustment rate test method: a. Initialization phase: Run the user power at a low value, start the acquisition and analysis module, and start recording power data; b. Upward adjustment stage: After waiting for the power to stabilize, send an increase command, the target power is P up , Record the time t when the command is sent 1 ; Monitor power changes until the target power P is reached up and stable, Record the time point t when the power is stable up .

[0041] c. Downward adjustment stage: After the power is stable, a downward adjustment command is sent, and the target power is P down , Record the time t when the command is sent 2 ; Monitor power changes until the target power P is reached down and stable, Record the time point t when the power is stable down .

[0042] d. End acquisition: Stop acquisition after the power is stable.

[0043] e. Data extraction: Obtain P from the collected data 1 , P up and t up , P 2 , P down and t down ; P 1 is time t 1 The power value; P up and t up To achieve and stabilize the power at the target value P up The time and power value of P 2 is time t 2 The power value; P down and t down To achieve and stabilize the power at the target value P down time and its power value.

[0044] f. Calculate the adjustment rate: Increase rate V up :V up = (P up –P 1 ) / (t up -t 1 ); Downward adjustment rate V down :V down = (P 2 -P down ) / (t down – t 2 ).

[0045] 4. Adjustment accuracy test method: a. Start the test: Turn on the acquisition and analysis module and start recording power data; Wait for the system power to stabilize.

[0046] b. Target instruction is issued: According to actual needs, an increase or decrease instruction is issued, and the target power is P targ ; Record the time t when the command is sent 1 .

[0047] c. Target power stable operation: Monitor power changes until the target power P is reached targ And run stably for a period of time; This stable operation period will be used as the time range for calculating the regulation accuracy.

[0048] d. Stop collection: After the test period ends, stop collecting and save the power data.

[0049] e. Data extraction: Determine the time range: start time, target power P targ The moment of reaching and stabilizing, the end time, the moment of stopping collection; Determine the target power P act (t): Find the actual power curve P from the collected data act (t).

[0050] f. Calculation accuracy: Calculate the actual power P at each time point within the test period. act (t) and target power P targ Relative deviation: Precision(t)= | (P act (t) – P targ ) / P act (t) | × 100%, and obtain the accuracy curve.

[0051] 5. Response time test method: a. Initialization phase: Set the user power to a lower value; Start the acquisition and analysis module and begin recording power data.

[0052] b. Upward adjustment stage: After the system is running stably, send an upward command with the target power being P up ; Record the time t when the command is sent 1 .

[0053] c. Steadily increase the target power: Monitor power changes until the target power P is reached up And run stably for a period of time; After the system is stable, send a downward adjustment command, and the target power is P down ; Record the time t when the downward adjustment instruction is sent 2 .

[0054] d. Steadily lower the target power: Monitor power changes until the target power P is reached down and stable; After the test is finished, stop collecting.

[0055] e. Data extraction: From the collected data, get the time t 1 The power value P 1 ; From the collected data, get the time t 2 The power value P 2 .

[0056] f. Calculate the dead zone: Set the dead zone according to the actual situation. Here, M represents the dead zone ratio value: P dead1 =(P up −P 1 )×M, P dead2 =(P down −P 2 )×M; After calculating the regulation dead zone, find the power change to reach P dead1 The time t dead1 , P dead2 The time t dead2 .

[0057] g. Response time calculation: t up_response =t dead1 −t 1， t down_response =t dead2 −t 2 .

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for evaluating the regulation capability of a virtual power plant, characterized in that: The evaluation device for the regulation capability of the virtual power plant includes: A high-precision acquisition module, which is used to perform high-precision acquisition of power parameter values ​​of the virtual power plant during operation and output corresponding power parameter signals; A main controller, wherein the main controller is connected to the high-precision acquisition module, and the main controller is also connected to the remote master station system through the wireless communication module. The main controller is used to control the operation of the high-precision acquisition module, and to perform a multi-dimensional evaluation of the virtual power plant regulation capability according to the power parameter signal, and is also used to transmit the power reference value and the multi-dimensional evaluation results to the remote master station system.

2. The device for evaluating the regulation capability of a virtual power plant according to claim 1, characterized in that: The main controller comprises: An acquisition accuracy analysis module, the acquisition accuracy analysis module is used to compare and analyze the power parameter value corresponding to the power parameter signal with the power reference value; The regulation capability analysis module is used to perform regulation capacity analysis, regulation rate analysis, regulation accuracy analysis and response time analysis on the virtual power plant according to the power parameter signal.

3. The device for evaluating the regulation capability of a virtual power plant according to claim 2, characterized in that: The main controller also includes a storage module, and the storage module is used to store power parameter data and analysis data.

4. The device for evaluating the regulation capability of a virtual power plant according to claim 1, characterized in that: The high-precision acquisition module includes a current transformer and a voltage transformer.

5. A method for evaluating the regulation capability of a virtual power plant, applied to the device for evaluating the regulation capability of a virtual power plant as claimed in any one of claims 1 to 4, characterized in that: The method for evaluating the regulation capability of the virtual power plant comprises the following steps: Obtain power parameter signals of the virtual power plant; The regulation capability of the virtual power plant is evaluated in multiple dimensions according to the power parameter signals.

6. The method for evaluating the regulation capability of a virtual power plant according to claim 5, characterized in that: The multi-dimensional evaluation includes regulation capacity analysis, regulation rate analysis, regulation accuracy analysis, response time analysis and acquisition accuracy analysis.

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