CN112345994A - CVT harmonic measurement error self-calibration system based on cloud platform and calibration method thereof - Google Patents

CVT harmonic measurement error self-calibration system based on cloud platform and calibration method thereof Download PDF

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CN112345994A
CN112345994A CN202011186977.9A CN202011186977A CN112345994A CN 112345994 A CN112345994 A CN 112345994A CN 202011186977 A CN202011186977 A CN 202011186977A CN 112345994 A CN112345994 A CN 112345994A
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cvt
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王鹏程
赵普志
林正胜
朱应钦
侯冰
罗忠游
王景明
窦峰川
张超文
闵富强
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Kashgar Power Supply Co Of State Grid Xinjiang Electric Power Co ltd
State Grid Corp of China SGCC
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Kashgar Power Supply Co Of State Grid Xinjiang Electric Power Co ltd
State Grid Corp of China SGCC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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Abstract

The invention relates to the technical field of measurement of a capacitor voltage transformer, in particular to a CVT harmonic measurement error self-calibration system based on a cloud platform and a calibration method thereof. Compared with the conventional mode of determining the harmonic transmission characteristic parameters of the CVT through a simulation experiment and calibrating the harmonic data, the method ensures the authenticity of the calibration data, improves the accuracy of harmonic measurement error calibration, can calibrate a plurality of groups of harmonic data simultaneously, and increases the calibration processing efficiency. On the other hand, compared with the mode that a CVT harmonic measurement error calibration device is additionally arranged on site and each capacitor voltage transformer is calibrated separately, the invention reduces the workload and the economic cost.

Description

CVT harmonic measurement error self-calibration system based on cloud platform and calibration method thereof
Technical Field
The invention relates to the technical field of measurement of a capacitor voltage transformer, in particular to a CVT harmonic measurement error self-calibration system based on a cloud platform and a calibration method thereof.
Background
In an electric power system, a CVT (capacitor voltage transformer) can be used for voltage measurement, high-frequency communication and relay protection of a neutral point direct grounding system with the level of 110kV or above, and is widely applied to buses of a booster station and a step-down transformer substation of a power plant. However, the method is explicitly proposed in the electric energy quality public power grid harmonic GB/T14549 + 1993: the "capacitive voltage transformer cannot be used for harmonic measurement. In harmonic voltage measurement, when there is a high need for the harmonic order or measurement accuracy, a resistive voltage divider or a capacitive voltage divider "should be used. Therefore, how to ensure the accuracy of the harmonic voltage data on the premise of using the CVT for voltage measurement becomes one of the important problems that must be solved in the power grid harmonic analysis work.
In general, there are two ways to achieve CVT harmonic measurement error calibration: 1) determining harmonic transfer characteristic parameters of the CVT by a simulation experiment method, and further calibrating harmonic data measured on the monitoring site; 2) the method for calibrating the CVT harmonic measurement error is realized by additionally arranging the CVT harmonic measurement error calibrating device on the monitoring site, and then the calibrated harmonic data is obtained by the harmonic monitoring device. The above method mainly has the following disadvantages: 1) because the experimental environment is different from the field environment, multiple technical indexes of the CVT in the experimental environment are not in accordance with the actual condition, the accuracy of transmission characteristic parameter results is inevitably reduced, and the harmonic measurement error calibration effect is poor and the efficiency is low; 2) the CVT in the power grid is large in quantity and wide in distribution, the method of additionally arranging the CVT harmonic measurement error calibration device is adopted, the workload and the working cost are inevitably greatly increased, and the practicability is low.
Disclosure of Invention
The invention provides a CVT harmonic measurement error self-calibration system based on a cloud platform and a calibration method thereof, overcomes the defects of the prior art, and can effectively solve the problems that the existing mode of determining harmonic transmission characteristic parameters of the CVT through simulation experiments and calibrating harmonic data has low data authenticity and is easy to cause poor harmonic measurement error calibration effect.
One of the technical schemes of the invention is realized by the following measures: a CVT harmonic measurement error self-calibration system based on a cloud platform comprises a cloud server, a plurality of harmonic data acquisition units and a plurality of communication units, wherein the harmonic data acquisition units and the communication units are arranged at the front end, and are the same in number and in one-to-one correspondence;
the harmonic data acquisition unit is used for measuring and acquiring harmonic data corresponding to the capacitor voltage transformer;
the communication unit is used for establishing a communication link between the cloud server and the corresponding harmonic data acquisition unit and uploading the harmonic data to the cloud server;
and the cloud server is used for acquiring the CVT equivalent circuit parameters and calibrating the corresponding harmonic data based on the CVT equivalent circuit parameters.
The following is further optimization or/and improvement of the technical scheme of the invention:
the cloud server comprises a CVT equivalent circuit parameter storage module, a harmonic data storage module and a harmonic data calibration module;
the CVT equivalent circuit parameter storage module is used for storing CVT equivalent circuit parameters;
the harmonic data storage module is used for receiving and storing the harmonic data uploaded by the harmonic data acquisition unit and storing the calibrated harmonic data;
and the harmonic data calibration module is used for calibrating corresponding harmonic data based on the CVT equivalent circuit parameters.
The harmonic data calibration module comprises a harmonic distortion data acquisition module and a calibration module;
the harmonic distortion data acquisition module is used for acquiring CVT harmonic distortion data through a transfer function based on CVT equivalent circuit parameters;
a calibration module to calibrate the harmonic data using the CVT harmonic distortion data.
The harmonic data acquisition unit comprises a data interface module, an A/D sampling plate, a control module, a storage module, a communication interface and a power module, wherein the data interface module is connected with the A/D sampling plate, the A/D sampling plate is connected with the control module, and the control module is respectively connected with the storage module, the communication interface and the power module.
The control module comprises a DSP controller and an ARM processor, the DSP controller is connected with the ARM processor, and the ARM processor is respectively connected with the storage module, the communication interface and the power module.
The system further comprises a client, wherein the client is used for inputting the CVT equivalent circuit parameters and performing visualization processing on the harmonic data before calibration and the harmonic data after calibration, and the visualization processing comprises displaying, viewing, exporting and managing.
The second technical scheme of the invention is realized by the following measures: a calibration method of a CVT harmonic measurement error self-calibration system based on a cloud platform comprises the following steps:
the cloud server acquires and stores CVT equivalent circuit parameters and harmonic data uploaded by each harmonic data acquisition unit;
the cloud server obtains CVT harmonic distortion data through a transfer function based on the CVT equivalent circuit parameters;
the cloud server uses the CVT harmonic distortion data to calibrate and store the harmonic data.
The following is further optimization or/and improvement of the technical scheme of the invention:
the method further comprises the step of carrying out visualization processing on the calibrated harmonic data through the client after the harmonic data is calibrated and stored by using the CVT harmonic distortion data, wherein the visualization processing comprises displaying, viewing, exporting and managing.
The invention provides a CVT harmonic measurement error self-calibration system based on a cloud platform, which can automatically measure and acquire harmonic data of a plurality of Capacitor Voltage Transformers (CVTs) through a plurality of harmonic data acquisition units in a one-to-one corresponding manner, and upload the harmonic data to a cloud server, wherein the cloud server calibrates the corresponding harmonic data based on front-end field CVT equivalent circuit parameters, and the CVT equivalent circuit parameters can be modified according to actual conditions. Therefore, compared with the conventional mode of determining the harmonic transmission characteristic parameters of the CVT through a simulation experiment and calibrating the harmonic data, the method ensures the authenticity of the calibration data, improves the accuracy of harmonic measurement error calibration, can calibrate a plurality of groups of harmonic data simultaneously, and increases the calibration processing efficiency. On the other hand, compared with a mode that a CVT harmonic measurement error calibration device is additionally arranged on site and each Capacitor Voltage Transformer (CVT) is separately calibrated, the method has the advantages that the workload is reduced, and the economic cost is reduced.
Drawings
Fig. 1 is a circuit configuration block diagram of embodiment 1 of the present invention.
Fig. 2 is a block diagram of a cloud server according to embodiment 1 of the present invention.
Fig. 3 is a circuit block diagram of a harmonic data acquisition unit in embodiment 1 of the present invention.
Fig. 4 is a circuit configuration diagram of an equivalent circuit of a CVT in embodiment 1 of the present invention.
FIG. 5 is a flow chart of example 2 of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in fig. 1, the cloud platform-based CVT harmonic measurement error self-calibration system comprises a cloud server, a plurality of harmonic data acquisition units and a plurality of communication units, wherein the harmonic data acquisition units and the communication units are arranged at the front end, and are the same in number and in one-to-one correspondence;
the harmonic data acquisition unit is used for measuring and acquiring harmonic data corresponding to the capacitor voltage transformer;
the communication unit is used for establishing a communication link between the cloud server and the corresponding harmonic data acquisition unit and uploading the harmonic data to the cloud server;
and the cloud server is used for acquiring the CVT equivalent circuit parameters and calibrating the corresponding harmonic data based on the CVT equivalent circuit parameters.
In the technical scheme, the harmonic data acquisition unit is connected with the Capacitor Voltage Transformer (CVT) and is used for measuring and acquiring harmonic data of the Capacitor Voltage Transformer (CVT), wherein the harmonic data acquisition unit can measure and acquire the harmonic data of the CVT for 2 times to 50 times, and the harmonic data comprises harmonic voltage, harmonic current and a harmonic phase angle. The communication unit is a conventional communication module, and can be a wireless communication module, and transmits the harmonic data measured and acquired by the corresponding harmonic data acquisition unit to the cloud server.
In the technical scheme, the cloud Server can carry a Windows Server system environment, and corresponding harmonic data are calibrated based on CVT equivalent circuit parameters.
The invention provides a CVT harmonic measurement error self-calibration system based on a cloud platform, which can automatically measure and acquire harmonic data of a plurality of Capacitor Voltage Transformers (CVTs) through a plurality of harmonic data acquisition units in a one-to-one corresponding manner, and upload the harmonic data to a cloud server, wherein the cloud server calibrates the corresponding harmonic data based on front-end field CVT equivalent circuit parameters, and the CVT equivalent circuit parameters can be modified according to actual conditions. Therefore, compared with the conventional mode of determining the harmonic transmission characteristic parameters of the CVT through a simulation experiment and calibrating the harmonic data, the method ensures the authenticity of the calibration data, improves the accuracy of harmonic measurement error calibration, can calibrate a plurality of groups of harmonic data simultaneously, and increases the calibration processing efficiency. On the other hand, compared with a mode that a CVT harmonic measurement error calibration device is additionally arranged on site and each Capacitor Voltage Transformer (CVT) is separately calibrated, the method has the advantages that the workload is reduced, and the economic cost is reduced.
The following is further optimization or/and improvement of the technical scheme of the invention:
as shown in fig. 2, the cloud server includes a CVT equivalent circuit parameter storage module, a harmonic data storage module, and a harmonic data calibration module;
the CVT equivalent circuit parameter storage module is used for storing CVT equivalent circuit parameters;
the harmonic data storage module is used for receiving and storing the harmonic data uploaded by the harmonic data acquisition unit and storing the calibrated harmonic data;
and the harmonic data calibration module is used for calibrating corresponding harmonic data based on the CVT equivalent circuit parameters.
In the above technical solution, parameters of the CVT equivalent circuit can be modified according to actual conditions. The CVT equivalent circuit parameter storage module and the harmonic data storage module can be SQL Server databases.
As shown in fig. 2, the harmonic data calibration module includes a harmonic distortion data acquisition module and a calibration module;
the harmonic distortion data acquisition module is used for acquiring CVT harmonic distortion data through a transfer function based on CVT equivalent circuit parameters;
a calibration module to calibrate the harmonic data using the CVT harmonic distortion data.
The CVT equivalent circuit parameters are obtained through a CVT equivalent circuit diagram, and CVT harmonic distortion data are obtained through a transfer function based on the CVT equivalent circuit parameters.
For example, the CVT equivalent circuit diagram, C, as shown in FIG. 41、C2For high and medium voltage capacitors, L for compensating reactance, ZmIs an intermediate transformer excitation impedance,ZDis the damper equivalent impedance, ZLIs the load impedance, Zm、ZD、ZLAre all reduced to the primary side impedance of the transformer, R1Is an intermediate transformer resistance, R2To compensate for reactor resistance, CSIs an equivalent stray capacitance at the primary side of the intermediate transformer, CS1For compensating equivalent stray capacitance of reactor, U1(s) is the primary side voltage, U2(s)、U3(s) is the intermediate node voltage, U4(s) is the output voltage (reduced to the primary side of the transformer), Zd1(s) to Zd6And(s) is the equivalent impedance corresponding to each stage of port. Obtaining CVT harmonic distortion data from the CVT equivalent circuit diagram, the process of calibrating the harmonic distortion data using the CVT harmonic distortion data comprising:
(1) calculating equivalent impedance of each level port in a CVT equivalent circuit diagram, namely CVT equivalent circuit parameters;
Zd6(s)＝Zm(s)//ZD(s)//ZL(s)
Zd5(s)＝Zd6(s)+R1
Zd4(s)＝Zd5(s)//(1/sCS)
Zd3(s)＝Zd4(s)+[(R2+sL)//(1/sCS1)]
Zd2(s)＝Zd3(s)//(1/sC2)
Zd1(s)＝Zd2(s)+(1/sC1)
(2) based on the voltage division relation of the voltage on the series impedance, the transfer functions of the voltages of all stages are listed, and CVT harmonic distortion data G are obtained(s)；
Up＝U1(s)
Figure BDA0002751693720000051
Figure BDA0002751693720000052
Figure BDA0002751693720000053
Us＝U4(s)/N
Figure BDA0002751693720000054
Wherein, UpIs the primary side voltage of the CVT; u shapesIs the secondary side voltage of the CVT; n is the transformation ratio of the intermediate transformer; s is j ω, ω is angular frequency; g(s)Namely CVT harmonic distortion data represented by the transfer function.
(3) The harmonic data (harmonic voltage amplitude, phase angle) is calibrated with the CVT harmonic distortion data.
As shown in fig. 3, the harmonic data acquisition unit includes a data interface module, an a/D sampling board, a control module, a storage module, a communication interface, and a power module, where the data interface module is connected to the a/D sampling board, the a/D sampling board is connected to the control module, and the control module is connected to the storage module, the communication interface, and the power module, respectively.
In the above technical solution, the data interface module is used for being connected with a Capacitor Voltage Transformer (CVT). The communication interface is used for connecting with a communication unit. The storage module may be a memory for storing harmonic data of a Capacitance Voltage Transformer (CVT) acquired by measurement. The power supply module is used for supplying power to the control module, and the voltage of the power supply module can be 3.3V.
As shown in fig. 3, the control module includes a DSP controller and an ARM processor, the DSP controller is connected to the ARM processor, and the ARM processor is connected to the storage module, the communication interface, and the power module, respectively.
The DSP controller and the ARM processor are both in the prior known technology, and the ARM processor is communicated with the DSP controller through a full-duplex serial port. The DSP controller is used for extracting needed information from the digital signals sent by the A/D sampling plate. The ARM processor is used for sending the information extracted by the DSP controller to the communication unit so as to upload the information to the cloud server.
As shown in fig. 1, the system further includes a client, configured to enter CVT equivalent circuit parameters, and perform visualization processing on the harmonic data before calibration and the harmonic data after calibration, where the visualization processing includes displaying, viewing, exporting, and managing.
In the above technical solution, the client may be a computer that remotely accesses the cloud server through a wireless communication manner.
Example 2: as shown in fig. 5, the calibration method of the cloud platform-based CVT harmonic measurement error self-calibration system includes:
s1, the cloud server acquires and stores CVT equivalent circuit parameters and harmonic data uploaded by each harmonic data acquisition unit;
s2, the cloud server obtains CVT harmonic distortion data through a transfer function based on the CVT equivalent circuit parameters;
and S3, the cloud server uses the CVT harmonic distortion data to calibrate and store the harmonic data.
According to the technical scheme, the parameters of the CVT equivalent circuit are manually input, and can be correspondingly changed according to an actual Capacitor Voltage Transformer (CVT), so that the accuracy of harmonic measurement error calibration is improved.
The following is further optimization or/and improvement of the technical scheme of the invention:
as shown in fig. 5, after the harmonic data is calibrated and stored by using the CVT harmonic distortion data, the calibrated harmonic data is visualized by the client, and the visualization includes displaying, viewing, exporting and managing.
In the technical scheme, a worker can input CVT equivalent circuit parameters into the cloud server through the client. The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

Claims (9)

1.一种基于云平台的CVT谐波测量误差自校准系统，其特征在于，包括云服务器、设置在前端的多个谐波数据采集单元和多个通信单元，所述谐波数据采集单元和通信单元数量相同，且一一对应；1. a CVT harmonic measurement error self-calibration system based on cloud platform, is characterized in that, comprises cloud server, multiple harmonic data acquisition units and multiple communication units that are arranged on the front end, described harmonic data acquisition unit and The number of communication units is the same, and they correspond one-to-one; 谐波数据采集单元，用于测量获取对应电容式电压互感器的谐波数据；The harmonic data acquisition unit is used to measure and obtain the harmonic data of the corresponding capacitive voltage transformer; 通信单元，用于建立云服务器与对应谐波数据采集单元之间的通信链路，上传谐波数据至云服务器；The communication unit is used to establish a communication link between the cloud server and the corresponding harmonic data acquisition unit, and upload the harmonic data to the cloud server; 云服务器，用于获取CVT等效电路参数，并基于CVT等效电路参数对相应的谐波数据进行校准。The cloud server is used to obtain the CVT equivalent circuit parameters and calibrate the corresponding harmonic data based on the CVT equivalent circuit parameters. 2.根据权利要求1所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，所述云服务器包括CVT等效电路参数存储模块、谐波数据存储模块、谐波数据校准模块；2. The cloud platform-based CVT harmonic measurement error self-calibration system according to claim 1, wherein the cloud server comprises a CVT equivalent circuit parameter storage module, a harmonic data storage module, and a harmonic data calibration module ; CVT等效电路参数存储模块，用于存储CVT等效电路参数；The CVT equivalent circuit parameter storage module is used to store the CVT equivalent circuit parameters; 谐波数据存储模块，用于接收存储谐波数据采集单元上传的谐波数据和存储校准后的谐波数据；The harmonic data storage module is used to receive and store the harmonic data uploaded by the harmonic data acquisition unit and store the calibrated harmonic data; 谐波数据校准模块，用于基于CVT等效电路参数对相应的谐波数据进行校准。The harmonic data calibration module is used to calibrate the corresponding harmonic data based on the CVT equivalent circuit parameters. 3.根据权利要求2所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，所述谐波数据校准模块包括谐波畸变数据获取模块和校准模块；3. The cloud platform-based CVT harmonic measurement error self-calibration system according to claim 2, wherein the harmonic data calibration module comprises a harmonic distortion data acquisition module and a calibration module; 谐波畸变数据获取模块，用于基于CVT等效电路参数，通过传递函数获得CVT谐波畸变数据；The harmonic distortion data acquisition module is used to obtain the CVT harmonic distortion data through the transfer function based on the CVT equivalent circuit parameters; 校准模块，用于使用CVT谐波畸变数据对谐波数据进行校准。Calibration module for calibrating harmonic data using CVT harmonic distortion data. 4.根据权利要求1或2或3所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，所述谐波数据采集单元包括数据接口模块、A/D采样板、控制模块、存储模块、通信接口、电源模块，所述数据接口模块与A/D采样板连接，A/D采样板与控制模块连接，控制模块分别与存储模块、通信接口、电源模块连接。4. The cloud platform-based CVT harmonic measurement error self-calibration system according to claim 1 or 2 or 3, wherein the harmonic data acquisition unit comprises a data interface module, an A/D sampling board, a control module , a storage module, a communication interface and a power supply module, the data interface module is connected with the A/D sampling board, the A/D sampling board is connected with the control module, and the control module is respectively connected with the storage module, the communication interface and the power supply module. 5.根据权利要求4所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，所述控制模块包括DSP控制器和ARM处理器，DSP控制器与ARM处理器连接，ARM处理器分别与存储模块、通信接口、电源模块连接。5. the CVT harmonic measurement error self-calibration system based on cloud platform according to claim 4, is characterized in that, described control module comprises DSP controller and ARM processor, DSP controller is connected with ARM processor, ARM handles The device is respectively connected with the storage module, the communication interface and the power module. 6.根据权利要求1或2或3或5中所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，还包括客户端，用于录入CVT等效电路参数，对校准前的谐波数据和校准后的谐波数据进行可视化处理，可视化处理包括显示、查看、导出、管理。6. The cloud platform-based CVT harmonic measurement error self-calibration system according to claim 1 or 2 or 3 or 5, characterized in that, it also includes a client, for inputting CVT equivalent circuit parameters, before calibration. The harmonic data and the calibrated harmonic data are visualized, and the visualization includes display, viewing, exporting, and management. 7.根据权利要求4中所述的基于云平台的CVT谐波测量误差自校准系统，其特征在于，还包括客户端，用于录入CVT等效电路参数，对校准前的谐波数据和校准后的谐波数据进行可视化处理，可视化处理包括显示、查看、导出、管理。7. The CVT harmonic measurement error self-calibration system based on cloud platform according to claim 4, it is characterized in that, also comprises a client, for inputting CVT equivalent circuit parameters, to the harmonic data before calibration and calibration The resulting harmonic data is visualized, including display, viewing, exporting, and management. 8.一种基于云平台的CVT谐波测量误差自校准系统的校准方法，其特征在于，包括：8. A calibration method of a cloud platform-based CVT harmonic measurement error self-calibration system, characterized in that, comprising: 云服务器获取存储CVT等效电路参数和各个谐波数据采集单元上传的谐波数据；The cloud server obtains and stores CVT equivalent circuit parameters and harmonic data uploaded by each harmonic data acquisition unit; 云服务器基于CVT等效电路参数，通过传递函数获得CVT谐波畸变数据；The cloud server obtains the CVT harmonic distortion data through the transfer function based on the CVT equivalent circuit parameters; 云服务器使用CVT谐波畸变数据对谐波数据进行校准及存储。The cloud server uses the CVT harmonic distortion data to calibrate and store the harmonic data. 9.根据权利要求8所述的基于云平台的CVT谐波测量误差自校准系统的校准方法，其特征在于，还包括在使用CVT谐波畸变数据对谐波数据进行校准存储后，通过客户端对校准后的谐波数据进行可视化处理，可视化处理包括显示、查看、导出、管理。9. The calibration method of the cloud platform-based CVT harmonic measurement error self-calibration system according to claim 8, further comprising, after using the CVT harmonic distortion data to calibrate and store the harmonic data, through the client Visualize the calibrated harmonic data, including display, view, export, and management.
CN202011186977.9A 2020-10-29 2020-10-29 CVT harmonic measurement error self-calibration system based on cloud platform and calibration method thereof Pending CN112345994A (en)

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