Power System Dynamic State Estimation Using Exponential Smoothing Methods

For Secure operation and real time monitoring of power system, phasor estimation of voltages and currents has become ineludible at the power system buses. Phasor Measurement Unit (PMU) is the device which measures bus voltage phasor at the bus to which it is connected and current phasors through the lines connected to that bus. Power System Dynamic State Estimation (PSDSE) incorporating synchronized phasor measurements acquire the ability to predict system state one step ahead. Exponential Smoothing methods, in which more weightage is given to recent data points and weightage decreases exponentially as the data points become older, are the most popular forecasting methods which ensure highly accurate and reliable phasor estimation. This paper illustrates PSDSE on an IEEE 14-bus test system using exponential smoothing methods with measurements obtained from PMU. The performance of different methods is compared.