Parameter estimation method of distribution network based on PMU measurement data

Accurate line parameters are the basis of improving real-time monitoring level and active control capability of smart distribution network. The synchronous data provided by distribution network PMU technology is an important method to distribution network line parameters estimation. This paper proposes a parameter estimation model of distribution network based on PMU measurement data and concentrated parameter characteristics. With the least square method, the estimation model is established by using the phasor data measured by PMU. And the nonlinear equations are solved by Newton iteration method to obtain the resistance, reactance and susceptance parameters of distribution network. Furthermore, the estimation model and method are extended to three-terminal lines for T-connection lines parameter estimation. PSCAD software is used to obtain the dynamic simulation data, which is used to verify the practicability and accuracy of this proposed method.