A Multi-contingency Preventive Control Method for Static Voltage Stability

The preventive control for static voltage stability is one of the important contents of the power system’s security and stability. A multi-contingency preventive control model for static voltage stability and its corresponding optimal solving algorithm are proposed to enhance the grid’s voltage stability when potentially complex contingencies occur. This model aims to minimize the control cost while maintaining the feasibility of normal operating state and keeping proper static voltage stability margin for each contingency considered. The selecting method of the key contingencies set is provided based on the requirement of static voltage stability margin. Meanwhile, the model is optimally solved according to the key contingencies set and then the corresponding preventive control strategies are obtained and implemented. The solving algorithm is further cycled until the voltage stability margins under all contingencies are satisfied the requirements. The validity of the proposed model and algorithm is verified through simulation tests in Eastern China Grid.