Hardware Research Of Phasor Measurement Unit Based On IEEE1588

With the advancement of science and technology and large interconnected power grid, grid stability problems have become increasingly prominent. The power system control center shall improve the monitoring and analysis capabilities which may ensure the stable operation of power systems. Phasor measurement device measures the voltage and current phasors of the key node and provides power system dynamic data. It not only monitors stability of the power grid, but also provides effective analysis of the data for the failure. However, most of the current phasor measurement units use GPS system that synchronize time, over-reliance on GPS may bring about the security risk for China’s electric power systems. Therefore, this paper presents a phasor measurement unit based on IEEE1588, which may achieve time synchronization over network.This paper introduces the basic principles of IEEE1588standard and analyzed the feasibility of the phasor measurement unit based on IEEE1588. The prospect and advantage of the IEEE1588used in power systems are pointed out and the whole network based on IEEE1588standard is made. It enables high accuracy time synchronization of the network. This article studies the hardware structure of the device. It consists of FPGA Virtex-4chip to control the data acquisition and AD conversion, MPC8313chip as the main CPU, and Ethernet as the primary means of communication. Compared to the traditional phasor measurement unit, the device designed in this paper has the following new features. First, use the IEEE1588clock signal instead of GPS as the synchronization signal and the hardware timestamps are completed by the CPU. Second, employ the FPGA chip instead of DSP chip to control the data acquisition and process the data from the ADC. Furthermore, use PCI interface to connect the FPGA and CPU, which can achieve high speed data transmission and has better expansibility.