| As a large number of distributed energy sources are connected to the distribution network,the operating environment of the power system is becoming more and more complex,and higher requirements are placed on the safe and stable operation of the distribution network.In order to more quickly and accurately monitor the operating status and various fault conditions of the distribution network,the application of wide area measurement systems(WAMS)based on phasor measurement technology in the distribution network has become increasingly important.The wide area measurement system in the distribution network is mainly composed of a synchronous phasor measurement unit(PMU),a synchronous phasor data concentrator(PDC),and a WAMS master station.It can monitor,control,and protect the distribution network in real time.Due to the influence of factors such as the large number of branch lines in the distribution network and the short length of the feeder lines,a large number of PMU devices have been installed in the distribution network.When studying the PDC equipment in the wide area measurement system of the distribution network,the use of actual various instruments and equipment to build a test platform is not only costly,but also difficult to achieve for some practical communication situations,such as large numbers of PMU access,Uneven transmission of real-time data frames,transmission frame format errors,and delays in real-time communication.In order to meet the distribution network PDC test requirements and build a distribution network WAMS test environment,this paper simulates the distribution network WAMS test environment based on the basic structure of the distribution network wide area measurement system.This paper first analyzes and researches the power system data transmission protocol GBT26865.2-2011 protocol,and designs and implements the distribution network PDC device based on the libuv asynchronous event driving mechanism of the Linux system.This device has high access,low latency,strong stability and other functional characteristics,and has been tested by the Chinese Academy of Electric Power to meet the various functional requirements of the distribution network PDC.On-site demonstrations have been conducted in various substations in the Lingang District of Shanghai.Secondly,when testing and researching the PDC function and performance,aiming at the test requirement of accessing a large number of PMU devices in the WAMSenvironment of the distribution network,this article uses the asynchronous non-blocking CAsync Socket class and high-precision multimedia timing through the Visual Studio 2017 simulation tool under the Windows system.The method of the combination of the devices is designed to realize a simulation software that can simulate the simultaneous communication of multiple PMUs,which is used as a downlink PMU data source in the WAMS test environment.This data source software can not only solve the PMU high access test requirements in the test environment,but also simulate a PDC data source,with functions such as time delay test,PMU access test,and communication protocol test.Finally,in order to improve the test efficiency and facilitate the viewing of test results,this paper has written a simulation master station test tool through the structured design of the document view.This test master station has the basic function of connecting the downstream PDC or PMU,and various communication frames transmitted by both parties are parsed in real time during communication and displayed on the interface.It facilitates the observation of test data,reduces test costs,and improves test efficiency. |
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