Electrotechnology |
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Proportional integral plus multi-frequency resonant current controller for grid-connected voltage source converter under imbalanced and distorted supply voltage conditions |
Jia-bing HU, Wei ZHANG, Hong-sheng WANG, Yi-kang HE, Lie XU |
School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; Department of Electronics and Electrical Engineering, Strathclyde University, Glasgow G1 1XW, UK |
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Abstract This paper proposes a current control scheme for a grid-connected pulse width modulator (PWM) voltage source converter (GC-VSC) under imbalanced and distorted supply voltage conditions. The control scheme is implemented in the positive synchronously rotating reference frame and composed of a single proportional integral (PI) regulator and multi-frequency resonant controllers tuned at the frequencies of 2ω and 6ω, respectively. The experimental results, with the target of eliminating the active power oscillations and current harmonics on a prototype GC-VSC system, validate the feasibility of the proposed current control scheme during supply voltage imbalance and distortion.
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Received: 12 June 2008
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