A method for sustained overvoltage control during power system restoration

During early stages of power system restoration when energizing lightly loaded transmission lines, operators need to pay special attention to the overvoltage problems. This work presents a sensitivity-based method to determine the most efficient control variables for the correction of voltage violations. Efficiency coefficient (EC) was defined to measure the efficiency of the control variables, which considered both voltage sensitivity to control variables and other factors including equipment limitations and system operation constraints as well. The control variables selected according to their ECs guarantee that no new voltage violations will be generated and the minimum shifts are needed for the control of overvoltages. The proposed method is demonstrated for restoration of the IEEE 39-bus New England system and it will provide guidance for both the development of PSR (power system restoration) plan and the real system restoration.