Advantages of power system state estimation using Phasor Measurement Units

摘要

An important tool for Energy Management Systems (EMS) is state estimation. Based on measurements taken throughout the network, state estimation gives an estimation of the state variables of the power system while checking that these estimates are consistent with the measurements. Traditionally, input measurements have been provided by the SCADA system (Supervisory Control and Data Acquisition). A disadvantage is that the measurements are not synchronised, which means that state estimation is not very precise during dynamic phenomena in the network. With the advent of real-time Phasor Measurement Units (PMU's), synchronised phasor measurements are possible which allows monitoring of dynamic phenomena. In this paper, the effect of the asynchronicity of measurements on the accuracy of the state estimation is analysed. Also, the possibility of using PMUs for state estimation and the effect of using PMU measurements as well as SCADA measurements is explored.