Study on Negative Resistance Mechanism and Elimination Method of Network Simplification

[摘要] The key of the further development of power system dynamic equivalence study is that correct understanding of negative resistance mechanism in network simplification and how to get rid of negative resistance. This paper analyzes the network simplification of power system, and it thoroughly studies the mechanism of equivalent branches with negative resistance. This paper also leads the definition of the constant impedance load and studies the property and the size of constant impedance load to further explain the mechanism of negative resistance production. This paper proposes a network transformation method which is based on power flow calculation results. This method transforms series branches which include negative resistance into PI-type branches. Finally the validity of this method is verified in sample cases from the China Southern Power Grid and IEEE 39 bus system. This method also solves the problem that some simulation software can't model the branches with negative resistance.

[发布机构] School of Electric Power South China, University of Technology Guangzhou, China^1

[效力级别] 电工学

[关键词] Elimination method;Impedance loads;Network simplification;Network transformation;Power flow calculations;Power system dynamics;Resistance mechanisms;Simulation software