CN205861836U - The voltage dip synchronous monitoring system of multistage power grid - Google Patents

The voltage dip synchronous monitoring system of multistage power grid Download PDF

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CN205861836U
CN205861836U CN201620866378.4U CN201620866378U CN205861836U CN 205861836 U CN205861836 U CN 205861836U CN 201620866378 U CN201620866378 U CN 201620866378U CN 205861836 U CN205861836 U CN 205861836U
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resistance
synchronous monitoring
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electrically connected
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吴国诚
王汉杰
龚向阳
王威
王波
虞殷树
叶樊
潘福荣
张锋
谢宇哲
王晴
张志雄
华宇肖
王强钢
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Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Abstract

本实用新型公开了一种多级电网的电压暂降同步监测系统,包括设于每一出线回路的每一电压等级母线节点处的电压暂降同步监测装置以及与每一个电压暂降同步监测装置通讯连接的上位机,所述电压暂降同步监测装置包括与电压电流采集柜内的三个第一电流互感器电和三个电压互感器均电连接的信号采集模块、与所述信号采集模块电连接的信号处理器、与所述信号处理器电连接的GPS时钟模块和用于与上位机通讯连接的第一通讯模块。上述多级电网的电压暂降同步监测系统,能够实时监测每一电压等级母线节点的电能质量信息,实时上传至上位机,当发生电压暂降时能够实时的将该信号传递至上位机,便于上位机进行后续的分析评估。

The utility model discloses a voltage sag synchronous monitoring system for a multi-level power grid, which comprises a voltage sag synchronous monitoring device arranged at each voltage level bus node of each outlet circuit and a synchronous monitoring device with each voltage sag The upper computer connected by communication, the voltage sag synchronous monitoring device includes a signal acquisition module electrically connected to the three first current transformers in the voltage and current acquisition cabinet and three voltage transformers, and the signal acquisition module A signal processor electrically connected, a GPS clock module electrically connected with the signal processor, and a first communication module used for communication connection with an upper computer. The voltage sag synchronous monitoring system of the above-mentioned multi-level power grid can monitor the power quality information of each voltage level bus node in real time and upload it to the host computer in real time. When a voltage sag occurs, the signal can be transmitted to the host computer in real time, which is convenient The upper computer performs subsequent analysis and evaluation.

Description

多级电网的电压暂降同步监测系统Synchronous monitoring system for voltage sag in multi-level power grid

技术领域technical field

本实用新型涉及电能质量监测领域,特别涉及一种多级电网的电压暂降同步监测系统。The utility model relates to the field of power quality monitoring, in particular to a voltage sag synchronous monitoring system of a multi-level power grid.

背景技术Background technique

随着智能电网的建设,系统容量、规模、电压等级等快速发展,系统的复杂性、多样性,用户生产效率和设备敏感性增强。负荷结构、电气特性等发生了根本变化,尤其是基于微电子、计算机、电力电子等技术的可再生能源发电系统、用户设备与工业过程等越来越多地接入电网,而这些设备对电压暂降非常敏感,使得电压暂降成为最严重电能质量问题。另一方面,即使几百公里的故障也可能导致本地电压暂降,电压暂降发生的频率远远高于其它电能质量问题,根据欧美发达国家电力部门有关调查显示,在由电能质量引起的用户投诉中,由电压暂降引起的投诉多于70%。因此设计一种具有结构设计模块化、数据采集计算精确高、多种通信方式的同步电压暂降监测系统,对电压暂降的分析评估,电压暂降传递规律的发掘以及预防电压暂降引起的重大事故都具有重要意义。With the construction of smart grid, the system capacity, scale, voltage level and other rapid development, the complexity and diversity of the system, user productivity and equipment sensitivity increase. Fundamental changes have taken place in the load structure and electrical characteristics, especially renewable energy power generation systems, user equipment and industrial processes based on microelectronics, computers, power electronics and other technologies are increasingly connected to the power grid, and these devices have great influence on the voltage Sags are very sensitive, making voltage sags the most serious power quality problem. On the other hand, even faults of hundreds of kilometers may cause local voltage sags, and the frequency of voltage sags is much higher than other power quality problems. Among the complaints, more than 70% were caused by voltage sags. Therefore, a synchronous voltage sag monitoring system with modular structure design, high precision data acquisition and calculation, and multiple communication methods is designed to analyze and evaluate voltage sags, discover the law of voltage sag transfer, and prevent voltage sags caused by voltage sags. Major accidents are of great significance.

对电压暂降的评价与治理都离不开电能质量的监测,目前,国外电能质量的知名公司如瑞士的LEM 公司、瑞典的 UNIPOWER 公司、美国的 FLUKE 公司,国内上海宝钢安大电能质量有限公司、国电中科电气有限公司等,对电能质量监测系统的研发都较为成熟,功能也比较完善目前,但市场上的各种电能质量监测产品对电压暂降的监测都存在以下局限性:1)主要集中于稳态电能质量指标,针对动态电能质量电压暂降而设计的监测系统极为少见;2)由于电压暂降具有传递性,需要进行各节点的同步监测,而市场上产品的监测时间精度低,并不能满足分析评估要求。3)对多级电网电压暂降监测的数据处理,没有针对性的评估系统;4)通信手段单一,不利于实现各级电网监测的系统化。The evaluation and control of voltage sags are inseparable from the monitoring of power quality. At present, well-known foreign power quality companies such as LEM in Switzerland, UNIPOWER in Sweden, FLUKE in the United States, and domestic Shanghai Baosteel Anda Power Quality Co., Ltd. , Guodian Zhongke Electric Co., Ltd., etc., the research and development of power quality monitoring systems are relatively mature, and the functions are relatively complete. However, various power quality monitoring products on the market have the following limitations in the monitoring of voltage sags: 1) It mainly focuses on steady-state power quality indicators, and monitoring systems designed for dynamic power quality voltage sags are extremely rare; 2) Due to the transitivity of voltage sags, synchronous monitoring of each node is required, and the monitoring time accuracy of products on the market Low, and cannot meet the analysis and evaluation requirements. 3) There is no targeted evaluation system for the data processing of multi-level grid voltage sag monitoring; 4) The single means of communication is not conducive to the systematization of grid monitoring at all levels.

因此,虽然国内外已开发了多功能的电能质量自动化监测产品,但尚无针对多级电网内电压暂降问题的同步监测,对于目前已成为最严重电能质量问题的电压暂降,有必要建立多级电网内电压暂降的同步监测系统。Therefore, although multifunctional power quality automatic monitoring products have been developed at home and abroad, there is no synchronous monitoring for voltage sags in multi-level power grids. For voltage sags, which has become the most serious power quality problem, it is necessary to establish Synchronous monitoring system for voltage sags in multi-level grids.

实用新型内容Utility model content

针对上述现有技术的不足,本实用新型所要解决的技术问题是:提供一种能够实现多级电网电压暂降同步监测的多级电网的电压暂降同步监测系统。Aiming at the deficiencies of the prior art above, the technical problem to be solved by the utility model is: to provide a multi-level grid voltage sag synchronous monitoring system capable of realizing multi-level grid voltage sag synchronous monitoring.

为解决上述技术问题,本实用新型采取的技术方案是:提供一种多级电网的电压暂降同步监测系统,包括设于每一出线回路的每一电压等级母线节点处的电压暂降同步监测装置以及与每一个电压暂降同步监测装置通讯连接的上位机,所述电压暂降同步监测装置包括与母线上的三个第一电流互感器和三个电压互感器的二次侧均电连接的电连接的信号采集模块、与所述信号采集模块电连接的信号处理器、与所述信号处理器电连接的GPS时钟模块和用于与上位机通讯连接的第一通讯模块。In order to solve the above technical problems, the technical solution adopted by the utility model is to provide a synchronous monitoring system for voltage sags of multi-level power grids, including synchronous monitoring of voltage sags at each voltage level bus node of each outlet circuit device and an upper computer connected in communication with each voltage sag synchronous monitoring device, the voltage sag synchronous monitoring device includes three first current transformers on the bus and the secondary sides of the three voltage transformers are electrically connected A signal acquisition module electrically connected to the signal acquisition module, a signal processor electrically connected to the signal acquisition module, a GPS clock module electrically connected to the signal processor, and a first communication module for communicating with an upper computer.

作为优化,所述信号采集模块包括与所述三个电压互感器和三个第一电流互感器的二次侧均电连接的电压电流变送模块、与所述电压电流变送模块电连接的信号调理模块、与所述信号调理模块电连接的A/D转换模块以及与所述A/D转换模块以及信号调理模块均电连接的锁相环。As an optimization, the signal acquisition module includes a voltage-current transmission module electrically connected to the secondary sides of the three voltage transformers and the three first current transformers, and a voltage-current transmission module electrically connected to the voltage-current transmission module. A signal conditioning module, an A/D conversion module electrically connected to the signal conditioning module, and a phase-locked loop electrically connected to both the A/D conversion module and the signal conditioning module.

作为优化,所述电压电流变送模块包括与所述三个电压互感器的二次侧一一对应电连接的三个电压变送电路以及与所述三个第一电流互感器二次侧一一对应电连接的三个电流变送电路;As an optimization, the voltage and current transmission module includes three voltage transmission circuits electrically connected to the secondary sides of the three voltage transformers in one-to-one correspondence and connected to the secondary sides of the three first current transformers one by one. One corresponds to three current transmission circuits electrically connected;

每一个电压变送电路均包括第一至第八电阻以及第一电容,第一电阻的第一端与对应的电压互感器电连接,第二端依次通过第二电阻、第三电阻及第四电阻后接地,所述第一电容与所述第四电阻并联连接,并且第一电容与所述第四电阻之间的节点与所述信号调理模块电连接;所述第二电阻与所述第三电阻之间的节点还依次通过第五电阻、第六电阻、第七电阻及第八电阻后与所述第三电阻与第四电阻之间的节点连接;Each voltage transmission circuit includes first to eighth resistors and a first capacitor, the first end of the first resistor is electrically connected to the corresponding voltage transformer, and the second end passes through the second resistor, the third resistor and the fourth resistor in turn. The first capacitor is connected to the fourth resistor in parallel, and the node between the first capacitor and the fourth resistor is electrically connected to the signal conditioning module; the second resistor is connected to the fourth resistor The node between the three resistors is also connected to the node between the third resistor and the fourth resistor through the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor in sequence;

每一电流变送电路均包括一第二电流互感器、第九电阻、第十电阻,所述电流变送电路通过该第二电流互感器的一次侧与对应的第一电流互感器二次侧电连接,所述第二电流互感器的二次侧具有两个引脚,第一个引脚与所述信号调理模块电连接,还依次通过所述第九电阻和第十电阻后接地,第二个引脚直接接地。Each current transmission circuit includes a second current transformer, a ninth resistor, and a tenth resistor. The current transmission circuit passes through the primary side of the second current transformer and the secondary side of the corresponding first current transformer. Electrically connected, the secondary side of the second current transformer has two pins, the first pin is electrically connected to the signal conditioning module, and is grounded after passing through the ninth resistor and the tenth resistor in turn, and the first pin is electrically connected to the signal conditioning module. Two pins are connected directly to ground.

作为优化,所述信号调理模块包括与三个电压变送电路和三个电流变送电路一一对应的六个信号调理电路,每一信号调理电路均包括运算放大器、第十一至第十四电阻以及第二电容,所述运算放大器的同相输入端通过所述第十一电阻与对应的变送电路相连,所述运算放大器的反相输入端通过第十二电阻接地,还直接通过第十三电阻与输出端直接相连,所述输出端还依次通过第十四电阻及第二电容接地,所述第十四电阻和第二电容之间的节点与所述A/D转换模块电连接。As an optimization, the signal conditioning module includes six signal conditioning circuits corresponding to three voltage transmission circuits and three current transmission circuits, and each signal conditioning circuit includes operational amplifiers, eleventh to fourteenth resistor and a second capacitor, the non-inverting input terminal of the operational amplifier is connected to the corresponding transmission circuit through the eleventh resistor, the inverting input terminal of the operational amplifier is grounded through the twelfth resistor, and directly through the tenth resistor The three resistors are directly connected to the output terminal, and the output terminal is grounded sequentially through the fourteenth resistor and the second capacitor, and the node between the fourteenth resistor and the second capacitor is electrically connected to the A/D conversion module.

作为优化,所述锁相环采用通用集成锁相环,型号为CD4046。As an optimization, the phase-locked loop adopts a general-purpose integrated phase-locked loop, model CD4046.

作为优化,所述上位机具有与所述第一通讯模块通讯连接的第二通讯模块。As an optimization, the host computer has a second communication module communicatively connected with the first communication module.

本实用新型的多级电网的电压暂降同步监测系统,在每一电压等级母线节点处均设置一电压暂降同步监测装置,并且每一个电压暂降同步监测装置均与所述上位机通讯连接,所述电压暂降同步监测装置用于实时监测每一级节点的电能质量信息,实时上传至上位机,当发生电压暂降时能够实时的将该信号传递至上位机,便于上位机进行后续的分析评估。每一电压暂降同步监测装置均设置有GPS时钟模块,能够有效的保证各电压等级下的监测装置对电压暂降起止时刻的监测具有极高的时间精度,其时间精度可以达到微秒,以使各监测装置对同一电压暂降源的同步监测,相对时间精度可以达到10微秒以内。The voltage sag synchronous monitoring system of the multi-level power grid of the present invention is equipped with a voltage sag synchronous monitoring device at each voltage level bus node, and each voltage sag synchronous monitoring device is connected to the upper computer through communication , the voltage sag synchronous monitoring device is used to monitor the power quality information of each level of nodes in real time, and upload it to the host computer in real time. When a voltage sag occurs, the signal can be transmitted to the host computer in real time, which is convenient for the host computer to perform subsequent analysis evaluation. Each voltage sag synchronous monitoring device is equipped with a GPS clock module, which can effectively ensure that the monitoring devices at each voltage level have extremely high time accuracy in monitoring the start and end moments of the voltage sag, and its time accuracy can reach microseconds. The relative time accuracy of each monitoring device for synchronous monitoring of the same voltage sag source can reach within 10 microseconds.

附图说明Description of drawings

为了更清楚地说明本实用新型实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本实用新型的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

图1是本实用新型多级电网的电压暂降同步监测系统一实施例的结构示意图。Fig. 1 is a structural schematic diagram of an embodiment of a voltage sag synchronous monitoring system for a multi-level power grid of the present invention.

图2是本实用新型多级电网的电压暂降同步监测系统中电压暂降同步监测装置的框图。Fig. 2 is a block diagram of a voltage sag synchronous monitoring device in the voltage sag synchronous monitoring system of the multi-level power grid of the present invention.

图3是图2中电压电流变送模块中其中一个电压变送电路的电路原理图。FIG. 3 is a schematic circuit diagram of one of the voltage transmission circuits in the voltage and current transmission module in FIG. 2 .

图4是图2中电压电流变送模块中其中一个电流变送电路的电路原理图。FIG. 4 is a schematic circuit diagram of one of the current transmission circuits in the voltage and current transmission module in FIG. 2 .

图5是图2中信号调理模块中其中一个信号调理电路的电路原理图。FIG. 5 is a schematic circuit diagram of one of the signal conditioning circuits in the signal conditioning module in FIG. 2 .

图6是图2中A/D转换模块的电路图。FIG. 6 is a circuit diagram of the A/D conversion module in FIG. 2 .

具体实施方式detailed description

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

请参见图1至图6,本实用新型的多级电网的电压暂降同步监测系统包括设于每一出线回路的每一电压等级母线节点处的电压暂降同步监测装置(本例中,若干电压暂降同步监测装置一一对应的设于每一电压等级母线节点处的电压电流采集柜内,该电压电流采集柜可被统称为测量内)以及与每一个电压暂降同步监测装置通讯连接的上位机,所述电压暂降同步监测装置包括与母线上的三个第一电流互感器和三个电压互感器二次侧均电连接的信号采集模块、与所述信号采集模块电连接的信号处理器、与所述信号处理器电连接的GPS时钟模块和用于与上位机通讯连接的第一通讯模块。Please refer to Fig. 1 to Fig. 6, the voltage sag synchronous monitoring system of the multilevel power grid of the present invention includes the voltage sag synchronous monitoring device (in this example, several The voltage sag synchronous monitoring device is installed one by one in the voltage and current acquisition cabinet at the bus node of each voltage level. The upper computer of the above-mentioned voltage sag synchronous monitoring device includes a signal acquisition module electrically connected to the secondary sides of three first current transformers and three voltage transformers on the bus, and a signal acquisition module electrically connected to the signal acquisition module A signal processor, a GPS clock module electrically connected to the signal processor, and a first communication module used for communication connection with an upper computer.

电压暂降同步监测装置安装于多级电网的各母线节点对应的测量柜中(每一个母线节点处均设有电压电流测量柜),接收各实时采集母线电压互感器二次侧信号及第一电流互感器二次侧信号,各个装置的系统时间均由一个统一的GPS时钟信号进行校准。具体的,一条母线上有三个电压互感器和三个第一电流互感器,而每一电压暂降同步监测装置则与对应母线的六个互感器(三个电压互感器和三个第一电流互感器)二次侧均电连接。电压暂降同步监测通过各类通信网络将所采集计算的电能参数实时传入上位机的软件中,并能实现各电参数的就地显示。The voltage sag synchronous monitoring device is installed in the measurement cabinet corresponding to each bus node of the multi-level power grid (each bus node is equipped with a voltage and current measurement cabinet), and receives the secondary side signal of each real-time acquisition bus voltage transformer and the first The secondary side signal of the current transformer and the system time of each device are calibrated by a unified GPS clock signal. Specifically, there are three voltage transformers and three first current transformers on one bus, and each voltage sag synchronous monitoring device is connected with six transformers (three voltage transformers and three first current transformers) corresponding to the bus. Transformer) are electrically connected to the secondary side. The voltage sag synchronous monitoring transmits the collected and calculated electric energy parameters to the software of the upper computer in real time through various communication networks, and can realize the local display of each electric parameter.

具体地,本实施例中的所述信号采集模块包括与六个互感器电连接的电压电流变送模块、与所述电压电流变送模块电连接的信号调理模块、与所述信号调理模块电连接的A/D转换模块以及与所述A/D转换模块及信号调理模块均电连接的锁相环。所述信号采集模块同时采集A、B、C三相电流及A、B、C相电压。Specifically, the signal acquisition module in this embodiment includes a voltage and current transmission module electrically connected to six transformers, a signal conditioning module electrically connected to the voltage and current transmission module, and a signal conditioning module electrically connected to the signal conditioning module. A connected A/D conversion module and a phase-locked loop electrically connected to the A/D conversion module and the signal conditioning module. The signal acquisition module simultaneously acquires A, B, C three-phase currents and A, B, C phase voltages.

电压电流变送模块与信号调理模块的综合作用是把电压、电流信号转换成适合A/D采样的电压信号;A/D转换模块的作用是将模拟信号转换为数字信号,锁相环作用是实现相位同步的自动控制,保证A/D转换芯片能够根据电网的实际频率采集数据。其中:The comprehensive function of the voltage and current transmission module and the signal conditioning module is to convert the voltage and current signals into voltage signals suitable for A/D sampling; the function of the A/D conversion module is to convert analog signals into digital signals, and the function of the phase-locked loop is Realize the automatic control of phase synchronization, and ensure that the A/D conversion chip can collect data according to the actual frequency of the power grid. in:

所述电压电流变送模块包括与所述三个电压互感器一一对应电连接的三个电压变送电路以及与所述三个第一电流互感器一一对应电连接的三个电流变送电路。三个电压变送电路的结构相同,输入端分别与三个电压互感器电连接,输出端与信号调理模块电连接。同样的,三个电流变送器的电路结构均相同,其输入端分别与三个第一电流互感器电连接,输出端与信号调理模块电连接。以下详细描述其中一个电压变送电路和其中一个电流变送电路的结构。The voltage and current transmission module includes three voltage transmission circuits electrically connected to the three voltage transformers in one-to-one correspondence and three current transmission circuits electrically connected to the three first current transformers in one-to-one correspondence circuit. The three voltage transmission circuits have the same structure, the input terminals are respectively electrically connected to the three voltage transformers, and the output terminals are electrically connected to the signal conditioning module. Similarly, the circuit structures of the three current transmitters are the same, their input terminals are respectively electrically connected to the three first current transformers, and their output terminals are electrically connected to the signal conditioning module. The structure of one of the voltage transmission circuits and one of the current transmission circuits will be described in detail below.

详见图3,电压变送电路包括第一至第八电阻以及第一电容C8,第一电阻R3的第一端与对应的所述电压互感器电连接,第二端依次通过第二电阻R4、第三电阻45及第四电阻R12后接地,所述第一电容C8与所述第四电阻R12并联连接,并且第一电容C8与所述第四电阻R12之间的节点与所述信号调理模块电连接;所述第二电阻R4与所述第三电阻R5之间的节点还依次通过第五电阻R10、第六电阻R14、第七电阻R16及第八电阻R17后与所述第三电阻R5与第四电阻R12之间的节点连接。See Figure 3 for details. The voltage transmission circuit includes first to eighth resistors and a first capacitor C8. The first end of the first resistor R3 is electrically connected to the corresponding voltage transformer, and the second end passes through the second resistor R4 in turn. , the third resistor 45 and the fourth resistor R12 are then grounded, the first capacitor C8 is connected in parallel with the fourth resistor R12, and the node between the first capacitor C8 and the fourth resistor R12 is connected to the signal conditioning The modules are electrically connected; the node between the second resistor R4 and the third resistor R5 passes through the fifth resistor R10, the sixth resistor R14, the seventh resistor R16 and the eighth resistor R17 in turn, and then connects with the third resistor R5 is connected to a node between the fourth resistor R12.

请详见图4,所述电流变送电路包括一第二电流互感器CT1、第九电阻R39、第十电阻R44,所述电流变送电路通过该第二电流互感器与对应的第一电流互感器的二次侧电连接,所述第二电流互感器具有两个引脚,第一个引脚与所述信号调理模块电连接,还依次通过所述第九电阻R39和第十电阻R44后接地,第二个引脚直接接地。Please refer to FIG. 4 for details. The current transmission circuit includes a second current transformer CT1, a ninth resistor R39, and a tenth resistor R44. The current transmission circuit communicates with the corresponding first current through the second current transformer. The secondary side of the transformer is electrically connected, the second current transformer has two pins, the first pin is electrically connected to the signal conditioning module, and is also sequentially passed through the ninth resistor R39 and the tenth resistor R44 After ground, the second pin is directly connected to ground.

所述信号调理模块包括与三个电压变送电路和三个电流变送电路一一对应的六个信号调理电路。六个信号调理电路的结构相同,唯一区别在于每一个信号调理电路与对应的一个变送电路电连接(电压变送电路或电流变送电路),以下以其中一个信号调理电路为例进行描述:The signal conditioning module includes six signal conditioning circuits corresponding to three voltage transmission circuits and three current transmission circuits. The structure of the six signal conditioning circuits is the same, the only difference is that each signal conditioning circuit is electrically connected to a corresponding transmission circuit (voltage transmission circuit or current transmission circuit). The following describes one of the signal conditioning circuits as an example:

所述信号调理电路包括运算放大器U3B、第十一至第十四电阻以及第二电容C28,所述运算放大器U3B的同相输入端通过所述第十一电阻R58与对应的变送电路相连,还直接连5V电源,所述运算放大器U3B的反相输入端通过第十二电阻R60接地,所述反相输入端还直接接-5V电源,还直接通过第十三电阻R61与输出端直接相连,所述输出端还依次通过第十四电R59阻及第二电容C28接地,所述第十四电阻R59和第二电容C28之间的节点与所述A/D转换模块电连接。The signal conditioning circuit includes an operational amplifier U3B, eleventh to fourteenth resistors and a second capacitor C28, the non-inverting input terminal of the operational amplifier U3B is connected to the corresponding transmission circuit through the eleventh resistor R58, and directly connected to the 5V power supply, the inverting input terminal of the operational amplifier U3B is grounded through the twelfth resistor R60, the inverting input terminal is also directly connected to the -5V power supply, and directly connected to the output terminal through the thirteenth resistor R61, The output end is also grounded sequentially through the fourteenth resistor R59 and the second capacitor C28, and the node between the fourteenth resistor R59 and the second capacitor C28 is electrically connected to the A/D conversion module.

所述A/D转换模块采用型号为AD7606BSTZ-6的芯片,A/D采样是信号采集模块的核心电路,所有电网信号都要经 A/D转换模块转换后才能送到信号处理器的DSP数字信号处理模块进行计算和处理,本实施例采用的是6通道同步采样芯片AD7606BSTZ-6,同时采集A、B、C三相电流及A、B、C相电压。AD7606BSTZ-6内置有模拟输入箝位保护、二阶抗混叠滤波器、跟踪保持放大器、16位电荷再分配逐次逼近型ADC、灵活的数字滤波器、2.5V基准电压源、基准电压缓冲以及高速串行和并行第二电流互感器。AD7606BSTZ-6采用5V单电源供电,可以处理±10V和±5V真双极性输入信号,同时所有通道均能以高达200 kSPS的吞吐速率采样。输入箝位保护电路可以耐受最高达±16.5V的电压。无论以何种采样频率工作,AD7606的模拟输入阻抗均为1MΩ。它采用单电源工作方式,具有片内滤波和高输入阻抗。The A/D conversion module adopts the chip of model AD7606BSTZ-6. A/D sampling is the core circuit of the signal acquisition module. The signal processing module performs calculation and processing. In this embodiment, a 6-channel synchronous sampling chip AD7606BSTZ-6 is used to simultaneously collect three-phase currents of A, B, and C and voltages of phases A, B, and C. AD7606BSTZ-6 has built-in analog input clamp protection, second-order anti-aliasing filter, track-and-hold amplifier, 16-bit charge redistribution successive approximation ADC, flexible digital filter, 2.5V reference voltage source, reference voltage buffer and high-speed Serial and parallel second current transformers. Operating from a single 5-V supply, the AD7606BSTZ-6 can handle ±10-V and ±5-V true bipolar input signals while sampling at throughput rates up to 200 kSPS on all channels. The input clamp protection circuit can withstand voltages up to ±16.5V. The analog input impedance of the AD7606 is 1MΩ regardless of the sampling frequency. It operates from a single supply with on-chip filtering and high input impedance.

所述锁相环采用通用性集成锁相环 CD4046,它是由 CMOS 电路构成的多功能单片集成锁相环,具有低功耗、输入阻抗高、电源电压范围宽等优点,在信号处理和数字系统中得到广泛的应用。CD4046 锁相环采用的是 RC 型压控振荡器,必须外接电容与电阻作为充放电元件。CD4046内部有线性放大器和整形电路,可以将输入的100Mmv左右的微弱信号变成方波或者脉冲信号。The phase-locked loop adopts the universal integrated phase-locked loop CD4046, which is a multifunctional single-chip integrated phase-locked loop composed of CMOS circuits, and has the advantages of low power consumption, high input impedance, and wide power supply voltage range. widely used in digital systems. The CD4046 phase-locked loop uses an RC type voltage-controlled oscillator, which must be connected with capacitors and resistors as charging and discharging components. There is a linear amplifier and a shaping circuit inside the CD4046, which can convert the input weak signal of about 100Mmv into a square wave or pulse signal.

所述信号处理器包括与所述A/D转换模块电连接的DSP数字信号处理模块以及与所述DSP数字信号处理模块电连接的ARM工程模块。其中:The signal processor includes a DSP digital signal processing module electrically connected to the A/D conversion module and an ARM engineering module electrically connected to the DSP digital signal processing module. in:

在本实施例中,所述数字信号处理模块采用的是带DSP内核的STM32F429型芯片,主要作为计算各项电能质量参数的平台,其带有FPU的ARM 32位Cortex-M4 CPU、在Flash存储器中实现零等待状态运行性能的自适应实时加速器、主频高达180MHz MPU,能够实现高达225DMIPS/1.25DMIPS/MHz的性能,具有DSP指令集。In the present embodiment, what described digital signal processing module adopts is the STM32F429 type chip with DSP core, mainly as the platform of calculating every power quality parameter, it has the ARM 32 bit Cortex-M4 CPU of FPU, in Flash memory The self-adaptive real-time accelerator that realizes zero-wait-state operation performance, the main frequency is up to 180MHz MPU, and the performance up to 225DMIPS/1.25DMIPS/MHz can be achieved, and it has a DSP instruction set.

所述ARM工程模块采用的是LPC1788FBD208型芯片,主要实现对电能质量参数结果进行存储和管理以及显示。LPC1788是集成LCD图像控制器的ARM Cortex-M3微控制器,是NXP半导体针对各种高级通讯,高质量图像显示等应用场合而设计的一款具有高集成度,以Cortex-M3为内核的微控制器,该微控制器包含有LCD控制器,10/100的以太网EMAC,USB全速Device/Host/OTG控制器,CAN总线控制器,SPI,SSP,IIC,IIS以及外部存储控制器EMC等资源。The ARM engineering module uses an LPC1788FBD208 chip, which mainly implements storage, management and display of power quality parameter results. LPC1788 is an ARM Cortex-M3 microcontroller integrated with an LCD image controller. It is a highly integrated microcontroller designed by NXP Semiconductors for various advanced communications, high-quality image display and other applications, with Cortex-M3 as the core. Controller, the microcontroller includes LCD controller, 10/100 Ethernet EMAC, USB full-speed Device/Host/OTG controller, CAN bus controller, SPI, SSP, IIC, IIS and external storage controller EMC, etc. resource.

GPS时钟模块:连接到DSP数据处理模块,以统一的GPS时钟信号校准不同电压等级下的监测装置的系统时间,当多级电网内某点发生短路故障时,GPS时钟信号能够有效的保证各电压等级下的监测装置对电压暂降起止时刻的监测具有极高的时间精度,其时间精度可以达到微秒,以使各监测装置对同一电压暂降源的同步监测,相对时间精度可以达到10微秒以内。GPS clock module: connected to the DSP data processing module to calibrate the system time of monitoring devices under different voltage levels with a unified GPS clock signal. When a short-circuit fault occurs at a point in the multi-level power grid, the GPS clock signal can effectively ensure that each voltage The monitoring devices under the level have extremely high time accuracy for monitoring the start and end moments of the voltage sag, and the time accuracy can reach microseconds, so that the relative time accuracy of each monitoring device for the synchronous monitoring of the same voltage sag source can reach 10 microseconds within seconds.

本实施例中,所述电压暂降同步监测装置还包括与所述信号处理器电连接的用于就地显示查询和设置的LCD液晶显示屏。查询功能包括基本电力参数、电压质量、电压谐波、实时曲线与历史曲线查询、电压暂降事件录波与分析查询。设置功能:系统设置,可以根据实际现场情况进行设置等等。In this embodiment, the voltage sag synchronous monitoring device further includes an LCD liquid crystal display screen electrically connected to the signal processor for displaying query and setting on the spot. Query functions include basic power parameters, voltage quality, voltage harmonics, real-time curve and historical curve query, voltage sag event recording and analysis query. Setting function: system setting, which can be set according to the actual site conditions and so on.

本实用新型的多级电网的电压暂降同步监测系统,在每一级母线节点处均设置一电压暂降同步监测装置,并且每一个电压暂降同步监测装置均与所述上位机通讯连接,所述电压暂降同步监测装置用于实时监测每一级节点的电能质量信息,实时上传至上位机,当发生电压暂降时能够实时的将该信号传递至上位机,便于上位机进行后续的分析评估。每一电压暂降同步监测装置均设置有GPS时钟模块,能够有效的保证各电压等级下的监测装置对电压暂降起止时刻的监测具有极高的时间精度,其时间精度可以达到微秒,以使各监测装置对同一电压暂降源的同步监测,相对时间精度可以达到10微秒以内。The voltage sag synchronous monitoring system of the multi-level power grid of the present invention is equipped with a voltage sag synchronous monitoring device at each level of bus node, and each voltage sag synchronous monitoring device is connected to the host computer through communication, The voltage sag synchronous monitoring device is used to monitor the power quality information of each level of nodes in real time and upload it to the host computer in real time. When a voltage sag occurs, the signal can be transmitted to the host computer in real time, which is convenient for the host computer to carry out subsequent Analytical evaluation. Each voltage sag synchronous monitoring device is equipped with a GPS clock module, which can effectively ensure that the monitoring devices at each voltage level have extremely high time accuracy in monitoring the start and end moments of the voltage sag, and its time accuracy can reach microseconds. The relative time accuracy of each monitoring device for synchronous monitoring of the same voltage sag source can reach within 10 microseconds.

以上仅为本实用新型的实施方式,并非因此限制本实用新型的专利范围,凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本实用新型的专利保护范围内。The above are only embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process conversion made by using the description of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other related Technical fields are all included in the scope of patent protection of the utility model in the same way.

Claims (6)

1. the voltage dip synchronous monitoring system of a multistage power grid, it is characterised in that: include being located at the every of each transmission line circuit Voltage dip synchronous monitoring device at one electric pressure bus nodes and leading to each voltage dip synchronous monitoring device The host computer that news connect, described voltage dip synchronous monitoring device includes and three the first current transformers on bus and three The letter that the signal acquisition module of the electrical connection that the secondary side of voltage transformer all electrically connects electrically connects with described signal acquisition module Number gps clock module that processor electrically connects with described signal processor and for the first communication being connected with upper machine communication Module.
2. the voltage dip synchronous monitoring system of multistage power grid as claimed in claim 1, it is characterised in that: described signals collecting Module includes that the voltage x current all electrically connected with the secondary side of described three voltage transformers and three the first current transformers becomes The Signal-regulated kinase sending module to electrically connect with described voltage x current transmitting module electrically connects with described Signal-regulated kinase A/D modular converter and the phaselocked loop all electrically connected with described A/D modular converter and Signal-regulated kinase.
3. the voltage dip synchronous monitoring system of multistage power grid as claimed in claim 2, it is characterised in that: described voltage x current Transmitting module include three voltage transmission circuit electrically connecting with the secondary side one_to_one corresponding of described three voltage transformers and Three the electric current transmission circuits electrically connected with described three the first Current Transformer Secondary side one_to_one corresponding;
Each voltage transmission circuit all includes the first to the 8th resistance and the first electric capacity, and the first end of the first resistance is with corresponding Voltage transformer electrical connection, the second end passes sequentially through ground connection after the second resistance, the 3rd resistance and the 4th resistance, described first electricity Hold and be connected with described 4th resistor coupled in parallel, and the node between the first electric capacity and described 4th resistance and described signal condition mould Block electrically connects;Node between described second resistance and described 3rd resistance also pass sequentially through the 5th resistance, the 6th resistance, the 7th It is connected with the node between described 3rd resistance and the 4th resistance after resistance and the 8th resistance;
Each electric current transmission circuit all includes one second current transformer, the 9th resistance, the tenth resistance, described electric current transmission circuit Being electrically connected with the first corresponding Current Transformer Secondary side by the primary side of this second current transformer, described second electric current is mutual The secondary side of sensor has two pins, and first pin electrically connects with described Signal-regulated kinase, also passes sequentially through described Ground connection after nine resistance and the tenth resistance, second pin is directly grounded.
4. the voltage dip synchronous monitoring system of multistage power grid as claimed in claim 3, it is characterised in that: described signal condition Module includes and three voltage transmission circuit and three electric current transmission circuits six signal conditioning circuits, Mei Yixin one to one Number modulate circuit all includes operational amplifier, the 11st to the 14th resistance and the second electric capacity, described operational amplifier same Phase input is connected with corresponding transmission circuit by described 11st resistance, and the inverting input of described operational amplifier passes through 12nd resistance eutral grounding, is also directly joined directly together with outfan by the 13rd resistance, and described outfan also passes sequentially through the tenth Four resistance and the second capacity earth, the node between described 14th resistance and the second electric capacity is electrically connected with described A/D modular converter Connect.
5. the voltage dip synchronous monitoring system of multistage power grid as claimed in claim 2, it is characterised in that: described phaselocked loop is adopted Using general integrated phase lock, model is CD4046.
6. the voltage dip synchronous monitoring system of the multistage power grid as described in claim any one of claim 1 to 5, it is special Levy and be: described host computer has the second communication module being connected with described first communication module communication.
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CN110118893A (en) * 2019-05-30 2019-08-13 山东公信安全科技有限公司 A kind of high-voltage fence unbalanced earth fault capacitance current test device
CN111027503A (en) * 2019-12-18 2020-04-17 广东电网有限责任公司 Method for adaptively unifying time scales of power quality data

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CN110118893A (en) * 2019-05-30 2019-08-13 山东公信安全科技有限公司 A kind of high-voltage fence unbalanced earth fault capacitance current test device
CN110118893B (en) * 2019-05-30 2024-03-29 中检集团公信安全科技有限公司 Single-phase grounding capacitance current testing device for high-voltage power grid
CN111027503A (en) * 2019-12-18 2020-04-17 广东电网有限责任公司 Method for adaptively unifying time scales of power quality data

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