The Integrative Computation Of Power System Transfer Capability With Voltage Stability Constrains

Power transfer capability provides valuable measurement to the security andreliability of interconnected power systems. The magnitude of available transfercapability reflects the interconnection intensity and structural quality of a powertransmission network. Voltage stability is an important factor restricting themaximum transfer capability. To take full use of the existing transmission anddistribution systems, enhance the stability margin, the algorithm calculating transfercapability should simulate the actual operating process of a power system as soon aspossible so as to obtain the maximum transfer capability. This paper analyzed the advantages and disadvantages of the primal-dualinterior point method and the continuation power flow method used for thecomputation of power system transfer capability respectively, then proposed anintegrative computation method. It uses the primal-dual interior point method to getthe optimal generation dispatching direction, then uses the continuation power flowmethod to trace the changing course of every discrete events, controls them to closeto the optimal values, so that more transfer capability is achieved. The results of IEEE-14,30,118 buses system test cases are provided. It is shownthat the proposed algorithm can not only attain larger power transfer capability, butalso simulate the actual operating process of a power system. It is an effectiveimprovement of the general continuation power flow algorithm.