Grid voltage synchronization algorithms for grid-connected power converters
WEN Wusong1,2, ZHANG Yingchao2, WANG Lu3, ZHAO Zhengming1, NIE Jintong1,2
1. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
2. Department of Power Engineering, Chongqing Communication Institute, Chongqing 400035, China;
3. Department of Mathematics and Information Engineering, Chongqing University of Education, Chongqing 400067, China
Abstract：An accurate and fast detection of the amplitude, frequency and phase angle of the grid voltage is crucial to assure the steady-state and dynamic performance of grid-connected power converters. This paper describes the classification of grid voltage synchronization algorithms, the principles and characteristics of phase-locked-loop (PLL) controllers, and the serious problems of PLL controllers such as frequency variations, unbalanced and distortied conditions, direct-current (DC) bias and phase-angle jumps with suppression methods to reduce these effects. The results show that PLL controllers based on synchronous reference frames or resonant controller are now widely used to track the grid voltage with multichannel-decoupling to suppress the harmonics and frequency fluctuations. A single-phase controller can be equivalent to a three-phase controller with new synchronization systems being more accurate, fast and robust.
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2017, Vol. 57 
