Grid current regulation of a three-phase voltage source inverter with an LCL input filter

被引:683
作者
Twining, E [1 ]
Holmes, DG [1 ]
机构
[1] Monash Univ, Dept Elect & Comp Syst Engn, Clayton, Vic 3800, Australia
基金
澳大利亚研究理事会;
关键词
current regulation; grid connection; harmonic distortion; LCL filter; linear analysis; voltage source inverter;
D O I
10.1109/TPEL.2003.810838
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Many grid connected,power electronic systems, such as STATCOMs, UPFCs, and distributed generation system interfaces, use a voltage source inverter (VSI) connected to the supply network through a filter. This filter, typically a series inductance, acts to reduce the switching harmonics entering the distribution network. An alternative filter is a LCL network which can achieve reduced levels of harmonic distortion at lower switching frequencies and with less inductance, and therefore has potential benefits for higher power applications. However, systems incorporating LCL filters require more complex control strategies and are not commonly presented in literature. This paper proposes a robust strategy for regulating the grid current entering a distribution network from a. three-phase VSI system connected via a, LCL filter. The strategy integrates an outer loop grid current regulator with inner capacitor current regulation to stabilize the system. A synchronous frame PI current regulation strategy is used for the outer grid current control loop. Linear analysis, Simulation, and experimental results are used to verify the stability of the control algorithm across a range of operating conditions. Finally, expressions for "harmonic impedance" of the system are derived to study the effects of supply voltage distortion on the harmonic performance of the system.
引用
收藏
页码:888 / 895
页数:8
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