Title :
A Transformerless 2-Level Inverter Based Static Var Generator with Multiple Functions in Medium Voltage Application
Author :
Li, Kuang ; Liu, Jinjun ; Zhao, Guopeng ; Wang, Zhaoan
Author_Institution :
Sch. of Electr. Eng., Xi´´an Jiaotong Univ.
Abstract :
This paper proposes a transformerless 2-level inverter based static var generator (SVG), which employs 20 series-connected IGBTs in each leg of the bridge for medium voltage blocking capability. The multifunctional SVG is used to compensate reactive power, negative sequence current, current harmonics and unbalanced utility voltages. Especially, a voltage controlled current source (VCCS) strategy is introduced and analyzed to mitigate grid voltage unbalance. Furthermore, the approaches to generating the reference signal for the SVG control circuit is presented according to different compensation objectives. Successful field installation and test results under 6kV voltage level showed satisfactory performance of the proposed SVG
Keywords :
compensation; constant current sources; insulated gate bipolar transistors; static VAr compensators; voltage control; 6 kV; SVG control circuit; control strategy; medium voltage application; mitigate grid voltage unbalance; multifunctional SVG; multiple functions; series-connected IGBT; static var generator; transformerless 2-level inverter; voltage controlled current source; Bridge circuits; Circuit testing; Insulated gate bipolar transistors; Inverters; Leg; Medium voltage; Power system harmonics; Reactive power; Signal generators; Voltage control; control strategy; static var generator; transformerless 2-level inverter; voltage unbalance;
Conference_Titel :
Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
1-4244-0364-2
Electronic_ISBN :
0197-2618
DOI :
10.1109/IAS.2006.256648
