计及双二阶锁相环动态过程影响的锁相偏差检测及相位补偿

doi:10.19595/j.cnki.1000-6753.tces.241136

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Abstract Voltage drop and the abrupt change of phase will occur when a fault occurs in the power system integrated with renewable energy sources (RESs). Factors, such as imbalanced load and asymmetric faults, will further cause the imbalanced amplitude and phase of three-phase voltage, leading to the phase-locked deviation of the double second-order generalized integrator phase-locked loop (DSOGI-PLL), which are commonly used in the real project. This deviation affects the output characteristics of the RESs, and some recent studies have analyzed the impact of the dynamic response of the PLL on the output characteristics of the grid-connected inverter. However, most of the above studies focus on the symmetrical faults and few studies quantitatively analyze the impact of the imbalanced amplitude of the grid voltage and the large abrupt change of phase of the voltage at the point of common coupling (PCC) on the phase-locked deviation under asymmetrical faults. The compensation method for the phase-locked deviation is also lacked. Therefore, a phase compensation method based on the dynamic analytical formula of phase-locked deviation is proposed in this paper, which realizes the fast and synchronous tracking of the DSOGI-PLL on the PCC voltage phase.
Firstly, the abrupt change mechanism of positive sequence voltage phase under imbalanced three-phase voltage amplitude and phase is comprehensively analyzed. Considering the influence of the dynamic response of the DSOGI-PLL, the analytical phase-locked deviation equation applicable to small disturbances is obtained using the small-signal model. Besides, the analytical equation applicable to large disturbances is obtained based on the waveform fitting. Secondly, a phase compensation scheme is proposed by analyzing the impact of the DSOGI-PLL dynamic response on the output characteristics of photovoltaic (PV), reducing the influence of PLL phase-locked deviation. The phase-locked deviation of the DSOGI-PLL under faults is compensated in real time by adding a compensation link in the DSOGI-PLL control, realizing the fast and synchronous tracking of the PCC voltage phase during the dynamic tracking process. Finally, a large number of simulations are carried out in the PV grid-connected system and simulation results show that the phase compensation scheme proposed in this paper can effectively reduce the phase-locked deviation, whether the abrupt change of PCC voltage phase after faults is small or large in the PV grid-connected system, benefiting the safe and stable operation of the system.
The following conclusions can be drawn from theoretical analysis and simulation verification: (1) The abrupt change of positive-sequence voltage phase is affected by the imbalanced amplitude and phase of three-phase voltage. (2) A phase compensation scheme is proposed based on the analysis of phase-locked deviation during the dynamic response of DSOGI-PLL to reduce the negative impact. The phase-locked deviation of the DSOGI-PLL after a fault is compensated in real time by adding a phase compensation link in the DSOGI-PLL control. (3) The phase compensation scheme proposed in this paper realizes the fast and synchronous tracking of PCC voltage phase by the DSOGI-PLL in the dynamic tracking process, effectively reducing the phase-locked deviation of DSOGI-PLL after grid-connected system faults and facilitating the safe and stable operation of the system.

Key words： New energy grid connected system phase-locked loop phase-locked deviation fault characteristics phase angle compensation

Received: 30 June 2024

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	Zheng Tao
	Liu Yutong
	Zhang Ruozhu
	Ai Jingwen

Cite this article:

Zheng Tao,Liu Yutong,Zhang Ruozhu等. Phase-Locked Deviation Detection and Phase Angle Compensation Scheme Considering the Influence of Dynamic Process of DSOGI-PLL[J]. Transactions of China Electrotechnical Society, 2025, 40(15): 4818-4834.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.241136 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I15/4818

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