Best State Estimate for the Phase Angles of Busbars in Power Systems via Circuit Modeled with DC Load Flow

State estimate is a digital processing method that gives many of the central control and dispatch operations in a power system a real-time data basis. It is essential to do state estimates to get rid of probable errors and boost system reliability. State variables, which are utilized to further calculate other power system characteristics, are necessary to determine the state of a system. Based on measurements, or input, such as active power, reactive power, voltage, and current magnitude collected from the system, these state variables are given a value. Voltage and phase angle are often utilized as state variables. The method used for state estimation will, however, affect the choice of state variables. In addition to input parameters, network data such as topology and impedances are also necessary. The measurements are made with a meter that has a predetermined full-scale reading that can be used as a starting point for calculations. When estimating the state, there may be errors that cause the reading from a meter to differ from the genuine value. Error in measurement is taken good care of here. Where measurement error, measurement and estimated value for the meter reading is considered. The best approximation of the voltage angles and power flow is obtained using it. The Weighted Least Squares Method is a widely used method for estimating system state.