Confirmation of reactive power sources based on critical point of voltage stability area
LI Wei, FANG Gefei
（Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract:  In order to solve the problem that reactive power can′t be transported for long distances, a thought was proposed that it was best to allocate reactive power sources based on critical point of voltage stability area. Firstly, the partition point was fixed at the critical point of voltage stability, which could make sure of the stability of networks under the partition control. Secondly, the reactive power margin of nodes was computed, and the minimal reactive power margin of each area was defined as the location of reactive power sources. Then, it was applied on IEEE30nodes system by using Matlab, and compared with the method also using reactive power margin without partitioning with the above thought. The simulation results indicate that the analysis raises the reliability of volt/var control better when facing with the critical state, and  improves the voltage stability of system better.
Key words: reactive power margin; critical point of voltage stability area; voltage stability