Analysis of State Estimation for Power System using Weighted Least Square Method

In the power system various quantities like power, voltage, and currents are analog quantities where the conversion of these analog quantities are converted into the digital output by A/D converter. These digital outputs are telemetered to energy control centre over various communication links. This process may involve the imperfect or bad measurement so that state estimation process estimates the true value of the state variable. Imperfect or bad measurement should be reduced by the state estimation process so that reliability of estimated data will be will be increased by the reducing bad measurement which may be present in the system. Data at the energy control centre used for the finding the system performance in real time for system security and condition of economic dispatch. In this paper Weighted Least Square (WLS) method is discussed for 6-bus sample power system and IEEE 30-bus power system.