Influence of phasor measurement unit in power system dynamic state estimation

Monitoring and control of the power system have become very important functions, for achieving a high reliability in the system and improving the Energy Management System (EMS) functions. Recently, Phasor Measurement Unit (PMU) has become one of the EMS applications for real time monitoring at the control center. In this paper, Phasor Measurement Unit based Dynamic State Estimation(DSE) is proposed under normal operating and bad data conditions, by using the decoupled current measurement as a new method for including PMU in DSE. The proposed method is carried out using the standard data IEEE 14-bus system as a case study.

I. Introduction

State estimation is one of the fundamental energy management system (EMS) application functions which provides an optimal estimate for the state of the system, and permits the high reliability for the operating system [1]. Traditional state estimation used SCADA system to measure the power flows, power injections and voltage magnitudes and current magnitudes and then processes these measurements to obtain the state of the system (computes the voltage magnitudes and angles at the buses) [1]–[3].