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Enhanced Phased-Locked Loop Technology with Anti Harmonic Interference Capability for Distributed Generation in Low-Voltage Distribution
Pages: 185-192
Year: Issue:  10
Journal: Transactions of China Electrotechnical Society

Keyword:  Distributed generationsingle phase-locked loopenhanced phased-locked loopharmonic;
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.
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