WU Lei1, ZHANG Jianmin1, LV Haican2, LU Xianchuan2

 

(1. College of Automation of Hangzhou Dianzi University,Hangzhou 310012, China;

 

2. State Grid Xinchang Power Supply Company, Xinchang 312500, China)

 

 

Abstract: Arming at the problem that there are a lot of three winding transformer In the actual power grid, but almost famous commercial software in this field including BPA simulation software and Matpower which was the most authority flow calculation open source power software both only provide double winding transformer model, limit its application in the power system with three winding transformer,power flow calculation was the core module of all kinds of application software of power system,so it was good choice to make the secondary development program rely on international authoritative source. The data format of Matpower requires was set,the equivalent circuit of transformer including three situations that in general,with ideal transformer,with per unit were researched and analyzed,the modeling method of equivalent mode which let three winding transformer be converted to a double winding was proposed, the above mentioned problem was solved. Finally, take Matpower software as examples, comparing with PSASP simulation software. The results indicate the modeling method is effectiveness.

 

Key words: threewinding transformer; doublewinding transformer; equivalent; modeling; open source procedure and software; Matpower; power flow calculation; PSASP