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| Research on phase-locked loop based on improved second-order generalized integrator |
| GUO Yichen, LU Wenzhou |
| School of Internet of Things Engineering, Jiangnan University, Wuxi, Jiangsu 214122 |
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Abstract In order to meet the control requirements of grid-connected converters under unba-lanced grid, a phase-locked loop (PLL) algorithm is required to track and detect grid synchronization signals. Since the traditional second-order generalized integrator-quadrature signal generator (SOGI-QSG) cannot eliminate DC component and harmonics, this paper proposes an improved second-order generalized integrator-quadrature signal generator (ISOGI-QSG) structure, which estimates the DC component by introducing a low-pass filter, then the ISOGI-QSG is added to the synchronous reference frame phase-locked loop (SRF-PLL), and a harmonic enhanced second-order generalized integrator phase-locked loop (HESOGI-PLL) method that can suppress harmonics and DC components is proposed. Finally, the simulation results verify the feasibility of the HESOGI-PLL method.
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Received: 01 April 2022
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GUO Yichen,LU Wenzhou. Research on phase-locked loop based on improved second-order generalized integrator[J]. Electrical Engineering, 2022, 23(9): 14-18.
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http://dqjs.cesmedia.cn/EN/Y2022/V23/I9/14
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2022, Vol. 23 
