Enhanced Phased-Locked Loop Technology with Anti Harmonic Interference Capability for Distributed Generation in Low-Voltage Distribution
Liu Chuang1, Pan Daidong1, Cai Guowei1, Zhang Zhonglin2
1. School of Electrical Engineering Northeast Dianli University Jilin 132012 China; 2. State Grid Jinzhou Electric Power Supply Company Jinzhou 121000 China
Abstract A large number of residential distributed sources connected to low-voltage distribution will cause issues such as voltage sag, frequency mutation, phase mutation and harmonics. In turn these issues will affect the phase-locked loop (PLL) of the distributed generation, leading to inaccurate detection of voltage phase and frequency. This paper analyzes three kinds of PLL techniques based on different structures, i. e. power-based PLL (P-PLL), Pseudolinear-enhanced PLL (PL-EPLL), second-order generalized integrator-PLL (SOGI-PLL). It is shown that the PL-EPLL fails to track the system voltage due to the harmonics of voltage or dc components. Thus a developed enhanced phased-locked loop (EPLL) method with anti harmonic interference capability is presented, based on band-pass filter. Finally, experimental and simulation results have verified the developed method. Compared with other three kinds of phase-locked loop, the proposed method is more suitable for low voltage distribution network with distributed power generations.
Liu Chuang,Pan Daidong,Cai Guowei等. Enhanced Phased-Locked Loop Technology with Anti Harmonic Interference Capability for Distributed Generation in Low-Voltage Distribution[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 185-192.
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