Study of Load Shedding Procedure for Power System Voltage Stability

Compared with other measures, load shedding procedure is an efficiency method to make the power system voltage stable when the system is nearly voltage collapse because of some faults occurred. In this paper, the methods of load shedding procedures were studied for the power system voltage stability and a new method was analyzed and calculated. Through the singular value decomposition to the Jacobian matrix in the power flow calculation, the diagonal matrix of singular values and its left and right singular matrix can be solved. The maximum element in the right singular column vector of the minimum singular value corresponds the key node, and that is the best node for load shedding. By using the power system analysis software, a regional power network is simulated. The power system voltage stability margin after load shedding in this method is higher than in others. This method provides a foundation for the load shedding procedure in the critical states or the process of voltage collapse.