文章基本信息

标题：Three-Level Neutral Point Clamped Converter Based And Switching Level Modeling UPFC
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作者：Bhupesh Deshmukh ; Dhaneshwari Sahu
期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2013
卷号：4
期号：10-4
出版社：Seventh Sense Research Group
摘要：in the recent years, due to economics and environment problems, build of new power planet and transmission line become more difficult. Hence it is advisable to enhance power transfer capability of the existing transmission lines up to thermal limit instead of constructing new one. For enhancing the power capability, FACTS controller like SSC, TCSC, and SVC are developed. But these controllers cannot compensate the real and reactive power separately. For this a controller called, Unified Power Flow Controller (UPFC) is developed which uses both the series and shunt controller with a common DC capacitor link. This paper presents state space vector analysis for ThreeLevel Neutral Point Clamped Converter operating as unified power flow controllers (UPFCs). It allows direct ac/ac power conversion without dc energy storage links; therefore, It reduces volume, cost, capacitor power losses, together with higher reliability. The line active and reactive power, together with ac supply reactive power, can be directly controlled by selecting an appropriate ThreeLevel Neutral Point Clamped Converter switching state guaranteeing good steadystate and dynamic responses. This advanced control of ThreeLevel Neutral Point Clamped Converter guarantee faster responses without overshoot and no steady state error, presenting no crosscoupling in dynamic and steadystate responses. Simulations are carried out, showing the effectiveness of the proposed method in steadystate and transient conditions
关键词：Direct power control; flexible ac transmission control (FACTS); multilevel converter; sliding mode control; unified power-flow controller (UPFC)