Fast real-time corrective control strategy for overload relief in bulk power systems

This study presents a fast real-time algorithm to relieve the overload occurring in a bulk power system. Based on DC power flow formulation, theoretical results are obtained for the overload relief by lines and series capacitors (SCs) switching. Two times of power flow analysis is utilised to identify a candidate list of lines and SCs that can relieve the overload by switching. The operator is thus able to make a mitigation plan based on the candidate list and relieve the overload after a quick validation. Examples are used to verify the theoretical results and the proposed algorithm. In addition, WECC´s West wide System Model is used to illustrate the proposed algorithm. Numerical test results show that the proposed algorithm is capable of relieving line overloads in a very fast and effective way, and it can be directly applied in practice.