Research And Implementation Of The Synchronized Phasor Measurement Unit In Power System

With the rapid development of China’s power grid technology, as wellas automation and communication technologies are widely used in powersystems, the unified strong and smart power grid pattern to UHV grid asthe backbone of the national grid is gradually taking shape.Interconnection of large area power grid improves the economic efficiencyof power system operation, while makes the dynamic process of the wholeinterconnected systems become more complex. Based on synchronizedphasor measurement unit (PMU) of WAMS (Wide Area MeasurementSystem) creates a good condition to the security monitoring and control ofthe power system. But the PMU device found many problems in the actualapplication process, mainly including the great measurement error, thepoor accuracy of the GPS clock on the time difference and the dynamicprocess of slow response. The above problems, resulting in the actualoperation the WAMS measurement data and functional reliability cannotbe guaranteed, greatly restricted the play of WAMS.In this paper, the design of synchronized phasor measurement unit inFPGA processor core, using BDS/GPS dual-mode conducts synchronoustiming, converts the phasor measurements (such as voltage, current, powerangle, etc.) to a unified time reference point coordinates, meanwhile usesthe synchronized phasor measurement algorithm combing the FFT andrandom forest to process the acquisition phasors. The improved algorithmnot only can keep the monitoring quality of the system, but also greatlyreduces the burden of communication system of the device, and improvethe response speed of the dynamic process of the power system. The PMU devices designed in this paper can change the situation that cannot bothcontain the calculation speed and accuracy on power system transientstability, can make to improve the PMU device performance, improve theaccuracy of real-time monitoring and measurement data reliability ofpower grid, and better realize the real-time monitoring and control of thewhole power grid operating state.