CN104991221B - The device and detection method calibrated to the metering device in distributed transformer substation - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及电力计量检定领域，具体涉及一种对分布式变电站中的计量装置进行校准的装置及检测方法。The invention relates to the field of electric power metering and verification, in particular to a device and a detection method for calibrating metering devices in distributed substations.
背景技术Background technique
随着变电站自动化和网络通信技术的飞速发展，IEC61850标准体系的颁布和推行，传统的变电站已逐步向数字化变电站过渡。数字化变电站电能量技术在采集上实现了模拟量向全数字化后，通过光纤线路传输的转变，通过点对点或以太网方式传输到数字式电能表，为数字化变电站内电能计量系统提供了数据来源，构成数字化变电站电能计量系统。With the rapid development of substation automation and network communication technology, and the promulgation and implementation of the IEC61850 standard system, traditional substations have gradually transitioned to digital substations. The electric energy technology of the digital substation realizes the transformation from analog to full digital in the collection, and transmits it through the optical fiber line, and transmits it to the digital electric energy meter through point-to-point or Ethernet, which provides a data source for the electric energy metering system in the digital substation. Digital substation electric energy metering system.
然而，在数字化变电站电能计量系统中，由于电压互感器、电流互感器的误差、合并单元的转换误差、传输过程的误码引起怕误差以及数字式电能表计算误差等等环节的存在，数字化变电站内电能计量系统会产生一定的系统误差，因此需要对数字化变电站的功率/电能误差进行校准。However, in the electric energy metering system of the digital substation, due to the existence of links such as the error of the voltage transformer and the current transformer, the conversion error of the merging unit, the error caused by the bit error in the transmission process, and the calculation error of the digital energy meter, the digital substation The internal electric energy metering system will produce a certain system error, so it is necessary to calibrate the power/electric energy error of the digital substation.
发明内容Contents of the invention
本发明根据现有技术的不足提供一种对分布式变电站中的计量装置进行校准的装置及检测方法，结构简单，操作方便，准确可靠。According to the deficiencies of the prior art, the present invention provides a device and a detection method for calibrating a metering device in a distributed substation, which are simple in structure, convenient in operation, accurate and reliable.
本发明的技术方案：一种对分布式变电站中的计量装置进行校准的装置，其特征在于：标准电流源和电流数据采集器相连接并与GPS/北斗授时天线组成时间标准电流源，标准电压源和电压数据采集器相连接并与GPS/北斗授时天线组成时间标准电压源，时间标准电流源与电流信号发送模块连接，时间标准电压源与电压信号发送模块连接，时间标准电流源和时间标准电压源连接合并单元，合并单元连接数字电能表，数字电能表连接电能脉冲捕获装置，电能脉冲捕获装置连接无线通讯模块，标准电源信号接收模块与电流信号发送模块和电压信号发送模块通讯连接，无线通讯模块和标准电源信号接收模块与PC机连接。The technical scheme of the present invention: a device for calibrating the metering device in a distributed substation, characterized in that: the standard current source is connected with the current data collector and forms a time standard current source with the GPS/Beidou timing antenna, and the standard voltage The source is connected with the voltage data collector and forms a time standard voltage source with the GPS/Beidou timing antenna, the time standard current source is connected with the current signal sending module, the time standard voltage source is connected with the voltage signal sending module, the time standard current source and the time standard The voltage source is connected to the merging unit, the merging unit is connected to the digital electric energy meter, the digital electric energy meter is connected to the electric energy pulse capture device, the electric energy pulse capture device is connected to the wireless communication module, the standard power signal receiving module is connected to the current signal sending module and the voltage signal sending module for communication, wireless The communication module and the standard power signal receiving module are connected with the PC.
所述电能脉冲捕获装置上还连接有GPS/北斗授时天线。A GPS/Beidou timing antenna is also connected to the power pulse capture device.
所述合并单元与数字电能表通过光纤连接。The merging unit is connected with the digital electric energy meter through an optical fiber.
所述GPS/北斗授时天线的授时精度≤100纳秒。The timing accuracy of the GPS/Beidou timing antenna is ≤100 nanoseconds.
一种利用所述的装置对分布式变电站中的计量装置进行校准的检测方法，其特征在于：包括以下步骤,A detection method for calibrating a metering device in a distributed substation by using the device, characterized in that it includes the following steps,
1)采用数字频率合成技术，以GPS-1PPS为同步信号，合成频率相位基准信号，采用基于DSP的直流数字频率合成技术，合成与GPS秒脉冲同步的标准信号源，输出带有时标的时间标准电流源和时间标准电压源；1) Using digital frequency synthesis technology, using GPS-1PPS as a synchronous signal to synthesize frequency and phase reference signals, using DSP-based DC digital frequency synthesis technology, synthesizing a standard signal source synchronized with the GPS second pulse, and outputting a time standard current with a time scale source and time standard voltage source;
2)电流信号采集器和电压信号采集器采集的电流和电压模拟信号输入到合并单元，合并单元将模拟信号转换为数字信号通过光纤输送到数字电能表；2) The current and voltage analog signals collected by the current signal collector and the voltage signal collector are input to the merging unit, and the merging unit converts the analog signal into a digital signal and transmits it to the digital energy meter through an optical fiber;
3)数字电能表通过接收的数字信号计算出电能量并将电能量转换为电能脉冲，电能脉冲捕获装置捕获电能脉冲并通过无线通讯模块传送到PC机；3) The digital energy meter calculates the electric energy through the received digital signal and converts the electric energy into electric energy pulses, and the electric energy pulse capture device captures the electric energy pulses and transmits them to the PC through the wireless communication module;
4)PC机通过标准电源信号接收模块接收步骤1)中带有时标的时间标准电流源和时间标准电压源信号计算出电能量，与电能脉冲捕获装置发来的电能量进行比对，计算误差，从而实现对分布式变电站中的计量装置进行功率/电能校准的目的。4) The PC receives the time standard current source and time standard voltage source signals with time scales in step 1) through the standard power signal receiving module to calculate the electric energy, compare it with the electric energy sent by the electric energy pulse capture device, and calculate the error, Therefore, the purpose of power/electric energy calibration for the metering device in the distributed substation is realized.
所述步骤1)中数字频率合成技术的频率调节方法步骤是：The frequency regulation method step of digital frequency synthesis technique in described step 1) is:
a.按F(I)＝A1*cos(360°*I/N+θ1)+A2*cos(2*360°*I/N+θ2)+……+Ancos(n*360°*I/N+θn)对信号N等份，计算出信号所有离散点的幅值，并将这些幅值依此排列存入数据区，作为基本的波形函数；a. Press F(I)＝A 1 *cos(360°*I/N+θ 1 )+A 2 *cos(2*360°*I/N+θ 2 )+…+A n cos(n *360°*I/N+θ n ) For N equal parts of the signal, calculate the amplitude of all discrete points of the signal, and store these amplitudes in the data area according to this, as the basic waveform function;
b.由DSP将波形函数送给四象限16位乘法DAC，还原得到所需的模拟信号；b. The DSP sends the waveform function to the four-quadrant 16-bit multiplication DAC to restore the required analog signal;
c.通过改变DAC的基准输入来调节信号幅度，改变波形的起始点调节信号的初时相角；c. Adjust the signal amplitude by changing the reference input of the DAC, and change the starting point of the waveform to adjust the initial phase angle of the signal;
d.因信号频率f＝fs/N，fs为采样频率，1/Δfs为采样时间间隔，改变Δfs即可调节信号频率。d. Since the signal frequency f=fs/N, fs is the sampling frequency, and 1/Δfs is the sampling time interval, the signal frequency can be adjusted by changing Δfs.
本发明的技术效果：采用GPS/北斗授时方式，利用1PPs秒脉冲实现时间同步；采用无线通讯技术进行数据传输，克服了由于电压、电流互感器间隔距离长无法通过有线传输数据的缺陷；采用时标标准源技术，确保了数据的同步性；结构简单，操作方便，准确可靠。Technical effects of the present invention: adopt GPS/Beidou timing mode, utilize 1PPs second pulse to realize time synchronization; adopt wireless communication technology to carry out data transmission, overcome the defect that data cannot be transmitted by wire due to the long distance between voltage and current transformers; Standard standard source technology ensures data synchronization; simple structure, convenient operation, accurate and reliable.
附图说明Description of drawings
图1是本发明整体结构示意图；Fig. 1 is a schematic diagram of the overall structure of the present invention;
图2是本发明检测方法流程图。Fig. 2 is a flowchart of the detection method of the present invention.
图中标号分别表示：1—标准电流源，2—电流数据采集器，3—时间标准电流源，4—标准电压源，5—电压数据采集器，6—时间标准电压源，7—电流信号发送模块，8—电压信号发送模块，9—合并单元，10—数字电能表，11—电能脉冲捕获装置，12—无线通讯模块，13—标准电源信号接收模块，14—PC机。The labels in the figure represent: 1—standard current source, 2—current data collector, 3—time standard current source, 4—standard voltage source, 5—voltage data collector, 6—time standard voltage source, 7—current signal Sending module, 8—voltage signal sending module, 9—merging unit, 10—digital energy meter, 11—energy pulse capture device, 12—wireless communication module, 13—standard power signal receiving module, 14—PC.
具体实施方式detailed description
下面结合附图对本发明进一步说明：Below in conjunction with accompanying drawing, the present invention is further described:
如图1所示，一种对分布式变电站中的计量装置进行校准的装置，其特征在于：标准电流源1和电流数据采集器2相连接并与GPS/北斗授时天线组成时间标准电流源3，标准电压源4和电压数据采集器5相连接并与GPS/北斗授时天线组成时间标准电压源6，时间标准电流源3与电流信号发送模块7连接，时间标准电压源6与电压信号发送模块8连接，时间标准电流源3和时间标准电压源6连接合并单元9，合并单元9连接数字电能表10，数字电能表10连接电能脉冲捕获装置11，电能脉冲捕获装置11连接无线通讯模块12，标准电源信号接收模块13与电流信号发送模块7和电压信号发送模块8通讯连接，无线通讯模块12和标准电源信号接收模块13与PC机14连接。As shown in Figure 1, a device for calibrating metering devices in distributed substations is characterized in that: a standard current source 1 is connected to a current data collector 2 and forms a time standard current source 3 with a GPS/Beidou timing antenna , the standard voltage source 4 is connected with the voltage data collector 5 and forms a time standard voltage source 6 with the GPS/Beidou timing antenna, the time standard current source 3 is connected with the current signal sending module 7, and the time standard voltage source 6 is connected with the voltage signal sending module 8 connections, the time standard current source 3 and the time standard voltage source 6 are connected to the merging unit 9, the merging unit 9 is connected to the digital electric energy meter 10, the digital electric energy meter 10 is connected to the electric energy pulse capturing device 11, and the electric energy pulse capturing device 11 is connected to the wireless communication module 12, The standard power signal receiving module 13 is communicatively connected with the current signal sending module 7 and the voltage signal sending module 8 , and the wireless communication module 12 and the standard power signal receiving module 13 are connected with the PC 14 .
电能脉冲捕获装置11上还连接有GPS/北斗授时天线。The power pulse capture device 11 is also connected with a GPS/Beidou timing antenna.
合并单元9与数字电能表10通过光纤连接。The merging unit 9 is connected to the digital energy meter 10 through an optical fiber.
GPS/北斗授时天线的授时精度≤100纳秒。The timing accuracy of the GPS/Beidou timing antenna is ≤100 nanoseconds.
如图2所示，一种利用所述的装置对分布式变电站中的计量装置进行校准的检测方法，其特征在于：包括以下步骤,As shown in Figure 2, a detection method for calibrating a metering device in a distributed substation by using the described device, is characterized in that: comprising the following steps,
1)采用数字频率合成技术，以GPS-1PPS为同步信号，合成频率相位基准信号，采用基于DSP的直流数字频率合成技术，合成与GPS秒脉冲同步的标准信号源，输出带有时标的时间标准电流源和时间标准电压源；1) Using digital frequency synthesis technology, using GPS-1PPS as a synchronous signal to synthesize frequency and phase reference signals, using DSP-based DC digital frequency synthesis technology, synthesizing a standard signal source synchronized with the GPS second pulse, and outputting a time standard current with a time scale source and time standard voltage source;
2)电流信号采集器和电压信号采集器采集的电流和电压模拟信号输入到合并单元，合并单元将模拟信号转换为数字信号通过光纤输送到数字电能表；2) The current and voltage analog signals collected by the current signal collector and the voltage signal collector are input to the merging unit, and the merging unit converts the analog signal into a digital signal and transmits it to the digital energy meter through an optical fiber;
3)数字电能表通过接收的数字信号计算出电能量并将电能量转换为电能脉冲，电能脉冲捕获装置捕获电能脉冲并通过无线通讯模块传送到PC机；3) The digital energy meter calculates the electric energy through the received digital signal and converts the electric energy into electric energy pulses, and the electric energy pulse capture device captures the electric energy pulses and transmits them to the PC through the wireless communication module;
4)PC机通过标准电源信号接收模块接收步骤1)中带有时标的时间标准电流源和时间标准电压源信号计算出电能量，与电能脉冲捕获装置发来的电能量进行比对，计算误差，从而实现对分布式变电站中的计量装置进行功率/电能校准的目的。4) The PC receives the time standard current source and time standard voltage source signals with time scales in step 1) through the standard power signal receiving module to calculate the electric energy, compare it with the electric energy sent by the electric energy pulse capture device, and calculate the error, Therefore, the purpose of power/electric energy calibration for the metering device in the distributed substation is realized.
所述步骤1)中数字频率合成技术的频率调节方法步骤是：The frequency regulation method step of digital frequency synthesis technique in described step 1) is:
a.按F(I)＝A1*cos(360°*I/N+θ1)+A2*cos(2*360°*I/N+θ2)+……+Ancos(n*360°*I/N+θn)对信号N等份，计算出信号所有离散点的幅值，并将这些幅值依此排列存入数据区，作为基本的波形函数；a. Press F(I)＝A 1 *cos(360°*I/N+θ 1 )+A 2 *cos(2*360°*I/N+θ 2 )+…+A n cos(n *360°*I/N+θ n ) For N equal parts of the signal, calculate the amplitude of all discrete points of the signal, and store these amplitudes in the data area according to this, as the basic waveform function;
b.由DSP将波形函数送给四象限16位乘法DAC，还原得到所需的模拟信号；b. The DSP sends the waveform function to the four-quadrant 16-bit multiplication DAC to restore the required analog signal;
c.通过改变DAC的基准输入来调节信号幅度，改变波形的起始点调节信号的初时相角；c. Adjust the signal amplitude by changing the reference input of the DAC, and change the starting point of the waveform to adjust the initial phase angle of the signal;
d.因信号频率f＝fs/N，fs为采样频率，1/Δfs为采样时间间隔，改变Δfs即可调节信号频率。d. Since the signal frequency f=fs/N, fs is the sampling frequency, and 1/Δfs is the sampling time interval, the signal frequency can be adjusted by changing Δfs.
本发明的一种对分布式变电站中的计量装置进行校准的装置，采用GPS/北斗授时方式，利用1PPs秒脉冲实现时间同步；采用无线通讯技术进行数据传输，克服了由于电压、电流互感器间隔距离长无法通过有线传输数据的缺陷；采用时标标准源技术，确保了数据的同步性；结构简单，操作方便，准确可靠。A device for calibrating metering devices in distributed substations of the present invention adopts the GPS/Beidou timing method and uses 1PPs second pulses to realize time synchronization; wireless communication technology is used for data transmission, which overcomes the gap between voltage and current transformers The long distance can not transmit data through cable defects; the time scale standard source technology is adopted to ensure the synchronization of data; the structure is simple, the operation is convenient, accurate and reliable.
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| CN105954705A (en) * | 2016-07-06 | 2016-09-21 | 国网上海市电力公司 | Digital electric energy measuring equipment remote calibration system and method |
| CN106199489A (en) * | 2016-07-06 | 2016-12-07 | 国网上海市电力公司 | Laboratory reproduction type digitalized electric energy measuring equipment remote calibration system and method |
| CN110146762A (en) * | 2019-06-05 | 2019-08-20 | 国网江苏省电力有限公司苏州供电分公司 | A detachable load test device suitable for smart substations |
| CN110940854B (en) * | 2019-11-14 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | Alternating current synchronous electric energy metering system based on Beidou/GPS clock |
| CN110736957B (en) * | 2019-12-12 | 2020-03-27 | 国网江西省电力有限公司电力科学研究院 | On-line detection system and method of electric energy metering device based on clock synchronization |
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| CN116559767A (en) * | 2023-05-11 | 2023-08-08 | 凯睿星通信息科技(南京)股份有限公司 | A Field Calibration Method of Electric Energy Meter Based on Satellite High and Low Orbit System Timing |
| CN118659854B (en) * | 2024-08-13 | 2024-10-29 | 安徽融兆智能有限公司 | Calibration synchronization method and system based on distributed electric energy metering system |
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| CN204705708U (en) * | 2015-07-07 | 2015-10-14 | 国家电网公司 | To the device that the measuring apparatus in distributed transformer substation is calibrated |
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