STABILITY IMPROVEMENT METHOD OF PHOTOVOLTAIC GRID-CONNECTED INVERTER UNDER WEAK GRID

Zeng Jianbin; Yang Yang; Zeng Jin; Yin Xuzhen; Xie Siwei

doi:10.19912/j.0254-0096.tynxb.2023-1616

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 387-392. DOI: 10.19912/j.0254-0096.tynxb.2023-1616

STABILITY IMPROVEMENT METHOD OF PHOTOVOLTAIC GRID-CONNECTED INVERTER UNDER WEAK GRID

Zeng Jianbin^1,2, Yang Yang^1,2, Zeng Jin^1,2, Yin Xuzhen^1,2, Xie Siwei³

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Abstract

Under the weak grid, the voltage at the common coupling point is prone to distortion, which causes the output phase of the phase-locked loop to deviate, thereby reducing the system phase margin and causing grid-connected current distortion. In order to compensate the phase difference, a control strategy based on small signal compensation is proposed. The small signal output impedance model of the system is derived, and the causes of phase deviation are analyzed. By adopting the improved small signal compensation control strategy, the offset of the output phase of the phase-locked loop caused by the coupling effect is compensated to ensure that the system can maintain a good phase margin when the grid impedance changes. The accuracy of the theoretical derivation and the feasibility of the improved method are illustrated by the prototype.

Key words

photovoltaic power generation / weak grid / grid-connected inverter / phase compensation / phase-locked loop

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Zeng Jianbin, Yang Yang, Zeng Jin, Yin Xuzhen, Xie Siwei. STABILITY IMPROVEMENT METHOD OF PHOTOVOLTAIC GRID-CONNECTED INVERTER UNDER WEAK GRID[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 387-392 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1616

References

[1] WANG X F, BLAABJERG F.Harmonic stability in power electronic-based power systems: concept, modeling, and analysis[J]. IEEE transactions on smart grid, 2019, 10(3): 2858-2870.
[2] 解宝, 周林, 马卫, 等. 光伏并网逆变器的高增益数字PI控制器设计[J]. 太阳能学报, 2019, 40(9): 2586-2593.
XIE B, ZHOU L, MA W, et al.Design of high gain digital PI controller for PV grid-connected inverter[J]. Acta energiae solaris sinica, 2019, 40(9): 2586-2593.
[3] QUINTERO J, VITTAL V, HEYDT G T, et al.The impact of increased penetration of converter control-based generators on power system modes of oscillation[J]. IEEE transactions on power systems, 2014, 29(5): 2248-2256.
[4] ZHAO M Q, YUAN X M, HU J B, et al.Voltage dynamics of current control time-scale in a VSC-connected weak grid[J]. IEEE transactions on power systems, 2016, 31(4): 2925-2937.
[5] 郑晨, 周林, 刘雅娟, 等. 多逆变器并联并网系统稳定性分析[J]. 太阳能学报, 2020, 41(1): 115-124.
ZHENG C, ZHOU L, LIU Y J, et al.Stability analysis of multi-parallel inverter system[J]. Acta energiae solaris sinica, 2020, 41(1): 115-124.
[6] 赵铁英, 高宁, 杨杰, 等. 基于PI控制器有源阻尼的并网逆变器自适应改进策略[J]. 太阳能学报, 2023, 44(5): 152-161.
ZHAO T Y, GAO N, YANG J, et al.Adaptive improvement strategy for grid-connected inverter based on active damping of PI controller[J]. Acta energiae solaris Sinica, 2023, 44(5): 152-161.
[7] 时帅, 安鹏, 符杨, 等. 含风电场的多端柔性直流输电系统小信号建模方法[J]. 电力系统自动化, 2020, 44(10): 92-102.
SHI S, AN P, FU Y, et al.Small signal modeling method for multi-terminal flexible DC transmission system with wind farm[J]. Automation of electric power systems, 2020, 44(10): 92-102.
[8] ZHU D H, ZHOU S Y, ZOU X D, et al.Improved design of PLL controller for LCL-type grid-connected converter in weak grid[J]. IEEE transactions on power electronics, 2020, 35(5): 4715-4727.
[9] 曾君, 岑德海, 陈润, 等. 针对直流偏移和谐波干扰的单相锁相环[J]. 电工技术学报, 2021, 36(16): 3504-3515.
ZENG J, CEN D H, CHEN R, et al.Single-phase phase-locked loop for DC offset and harmonic interference[J]. Transactions of China Electrotechnical Society, 2021, 36(16): 3504-3515.
[10] 涂春鸣, 高家元, 赵晋斌, 等. 弱电网下具有定稳定裕度的并网逆变器阻抗重塑分析与设计[J]. 电工技术学报, 2020, 35(6): 1327-1335.
TU C M, GAO J Y, ZHAO J B, et al.Analysis and design of grid-connected inverter impedance remodeling with fixed stability margin in weak grid[J]. Transactions of China Electrotechnical Society, 2020, 35(6): 1327-1335.
[11] ZHU D H, ZHOU S Y, ZOU X D, et al.Small-signal disturbance compensation control for LCL-type grid-connected converter in weak grid[J]. IEEE transactions on industry applications, 2020, 56(3): 2852-2861.
[12] ZHANG C, WANG X F, BLAABJERG F, et al.Benchmarking of small-signal dynamics of single-phase PLLs[C]//2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia), Seoul, Korea (South), 2015: 1420-1427.
[13] ZHU D H, ZHOU S Y, ZOU X D, et al.Small-signal disturbance compensation control for LCL-type grid-connected converter in weak grid[J]. IEEE transactions on industry applications, 2020, 56(3): 2852-2861.
[14] 谢志为, 陈燕东, 伍文华, 等. 弱电网下多逆变器并网系统的全局高频振荡抑制方法[J]. 电工技术学报, 2020, 35(4): 885-895.
XIE Z W, CHEN Y D, WU W H, et al.Global high-frequency oscillation suppression method for multi-inverter grid-connected system in weak grid[J]. Transactions of China Electrotechnical Society, 2020, 35(4): 885-895.
[15] SUN J.Impedance-based stability criterion for grid-connected inverters[J]. IEEE transactions on power electronics, 2011, 26(11): 3075-3078.