Interaction analysis and co-ordination of SVC voltage and damping control

In this paper, the interaction between SVC voltage and damping control is studied. It is revealed by analysis that the SVC voltage and damping control, in fact, conflict each other and one function is performed always at the price of sacrificing the performance of another function. The incompatibility between SVC voltage and damping control not only just exists but also is inherent. To tackle the counteraction between two different control functions of the SVC, a scheme of co-ordination is proposed in the paper. The scheme is based on an optimal search using nonlinear programming. Test results of an example power system are presented, which confirm the analytical studies and demonstrate the success of the scheme of co-ordination proposed.