Practical implementation of a VSC-HVDC in WLS-based state estimation

This paper proposes a practical approach to incorporate a High Voltage Direct-current (HVDC) link in a state estimation algorithm based on the technique Weighted Least Squares (WLS). The power measurements of the HVDC are directly appended to traditional measurements to estimate the equilibrium point of the power system. The proposed approach simultaneously upgrades the estimated values of the state variables of the HVDC controllers and the state variables of the rest of the electric network, to obtain a unified solution in a single-frame of reference. Results are presented to demonstrate the effectiveness of the proposed approach to assess the estimation of the system state and to set the parameters of the HVDC controllers for given control specifications.