COMPOUND DECOUPLING CONTROL STRATEGY FOR DFIG CONSIDERING PLL IN WEAK GRIDS

Feng Yantao; Xie Zhen; Li Mengjie; Yang Shuying; Zhang Xing

doi:10.19912/j.0254-0096.tynxb.2023-0491

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (7) : 618-625. DOI: 10.19912/j.0254-0096.tynxb.2023-0491

COMPOUND DECOUPLING CONTROL STRATEGY FOR DFIG CONSIDERING PLL IN WEAK GRIDS

Feng Yantao, Xie Zhen, Li Mengjie, Yang Shuying, Zhang Xing

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Abstract

With the rapid growth of the grid-connected capacity of wind power generation, the equivalent short-circuit ratio （SCR） of point of common coupling （PCC） decreases rapidly. The doubly-fed induction generator （DFIG） based on phase-locked loop （PLL） synchronization are faced with the problems of insufficient stability margin and intensified power coupling. By constructing a small signal model of DFIG in weak grids, this paper explores the mechanism of PLL's influencing on current control and the reducing the system stability margin. Furthermore, a compound decoupling control strategy considering the effect of PLL is proposed, which effectively improves the stable operation capability of DFIG in weak grids. The effectiveness of the proposed strategy is verified by simulation and experiment.

Key words

DFIG / weak grid / PLL / coupling loop / coordinate transformation

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Feng Yantao, Xie Zhen, Li Mengjie, Yang Shuying, Zhang Xing. COMPOUND DECOUPLING CONTROL STRATEGY FOR DFIG CONSIDERING PLL IN WEAK GRIDS[J]. Acta Energiae Solaris Sinica. 2024, 45(7): 618-625 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0491

References

[1] 于琳, 孙华东, 赵兵, 等. 新能源并网系统短路比指标分析及临界短路比计算方法[J]. 中国电机工程学报, 2022, 42(3): 919-928, 8.
YU L, SUN H D, ZHAO B, et al.Short circuit ratio index analysis and critical short circuit ratio calculation of renewable energy grid-connected system[J]. Proceedings of the CSEE, 2022, 42(3): 919-928, 8.
[2] 刘其辉, 田若菡, 贾瑞媛, 等. 基于模糊控制的双馈风电机组次同步振荡自适应抑制策略[J]. 太阳能学报, 2023, 44(7): 392-401.
LIU Q H, TIAN R H, JIA R Y, et al.Adaptive subsynchronous oscillation suppression strategy of double-fed wind power generator based on fuzzy control[J]. Acta energiae solaris sinica, 2023, 44(7): 392-401.
[3] 颜湘武, 孙雪薇, 崔森, 等. 考虑系统频率连续波动与二次跌落的双馈风力发电机组虚拟惯量通用控制策略[J]. 太阳能学报, 2021, 42(11): 247-254.
YAN X W, SUN X W, CUI S, et al.Virtual inertia general control strategy of DFIG-based wind turbine considering continuous fluctuation of system frequency and second frequency drop[J]. Acta energiae solaris sinica, 2021, 42(11): 247-254.
[4] ZHANG D L, WANG Y J, HU J B, et al.Impacts of PLL on the DFIG-based WTG's electromechanical response under transient conditions: analysis and modeling[J]. CSEE journal of power and energy systems, 2016, 2(2): 30-39.
[5] 孔旻玥, 孙丹, 年珩. 双馈风电机组系统功率响应特性建模方法[J]. 电力系统自动化, 2022, 46(2): 118-125.
KONG M Y, SUN D, NIAN H.Modeling method for power response characteristics of DFIG-based wind turbine system[J]. Automation of electric power systems, 2022, 46(2): 118-125.
[6] LIU J L, TANG F, ZHAO J B, et al.Coherency identification for wind-integrated power system using virtual synchronous motion equation[J]. IEEE transactions on power systems, 2020, 35(4): 2619-2630.
[7] 朱当, 黄云辉, 陈后全, 等. 弱电网下双馈风机多机系统直流电压控制时间尺度的建模与稳定性分析[J]. 智慧电力, 2021, 49(4): 21-29.
ZHU D, HUANG Y H, CHEN H Q, et al.Modeling and stability analysis of DC voltage control timescale in DFIG multi-machine system under weak power grid[J]. Smart power, 2021, 49(4): 21-29.
[8] 罗晨曦, 徐政, 陆韶琦. 连接弱同步支撑系统的电压源换流器优化矢量控制策略[J]. 电力系统自动化, 2018, 42(23): 14-19.
LUO C X, XU Z, LU S Q.Optimized vector control strategy of voltage source converter linked to weakly-synchronized support systems[J]. Automation of electric power systems, 2018, 42(23): 14-19.
[9] 高家元, 涂春鸣, 肖凡, 等. 弱电网下PLL结构引入的不对称正反馈环路对并网逆变器稳定性的影响分析[J]. 中国电机工程学报, 2022, 42(3): 1113-1124, 26.
GAO J Y, TU C M, XIAO F, et al.Analysis of the influence of the asymmetric positive-feedback loop introduced by the PLL structure on the stability of grid-connected inverter in weak grids[J]. Proceedings of the CSEE, 2022, 42(3): 1113-1124, 26.
[10] HU B, NIAN H, LI M, et al.Impedance-based analysis and stability improvement of DFIG system within PLL bandwidth[J]. IEEE transactions on industrial electronics, 2022, 69(6): 5803-5814.
[11] HUANG Y H, WANG L Y, ZHANG S D, et al.Impacts of phase-locked loop dynamic on the stability of DC-link voltage control in voltage source converter integrated to weak grid[J]. IEEE journal on emerging and selected topics in circuits and systems, 2022, 12(1): 48-58.
[12] 陈俊儒, 李冠群, 刘牧阳, 等. 电网阻抗比对跟网变换器同步稳定性的影响机理[J]. 中国电机工程学报, 2023, 43(6): 2331-2338, 23.
CHEN J R, LI G Q, LIU M Y, et al.Influence mechanism of R/X ratio on synchronization stability of grid-following converter[J]. Proceedings of the CSEE, 2023, 43(6): 2331-2338, 23.
[13] LIU J, YAO W, WEN J Y, et al.Impact of power grid strength and PLL parameters on stability of grid-connected DFIG wind farm[J]. IEEE transactions on sustainable energy, 2020, 11(1): 545-557.
[14] DAVARI M, MOHAMED Y A R I. Robust vector control of a very weak-grid-connected voltage-source converter considering the phase-locked loop dynamics[J]. IEEE transactions on power electronics, 2017, 32(2): 977-994.
[15] SONG Y P, BLAABJERG F.Analysis of middle frequency resonance in DFIG system considering phase-locked loop[J]. IEEE transactions on power electronics, 2018, 33(1): 343-356.
[16] 刘巨, 姚伟, 文劲宇. 考虑PLL和接入电网强度影响的双馈风机小干扰稳定性分析与控制[J]. 中国电机工程学报, 2017, 37(11): 3162-3173, 3371.
LIU J, YAO W, WEN J Y.Small signal stability analysis and control of double-fed induction generator considering influence of PLL and power grid strength[J]. Proceedings of the CSEE, 2017, 37(11): 3162-3173, 3371.
[17] SHEN Y Q, MA J, WANG L T.Study on DFIG dissipation energy model and low-frequency oscillation mechanism considering the effect of PLL[J]. IEEE transactions on power electronics, 2020, 35(4): 3348-3364.
[18] 黄云辉, 王凌云, 喻恒凝, 等. 弱电网下双馈风力发电系统的稳定性极限研究[J]. 电力工程技术, 2022, 41(4): 9-17.
HUANG Y H, WANG L Y, YU H N, et al.Stability limit of double-fed induction generator system connected to weak grid[J]. Electric power engineering technology, 2022, 41(4): 9-17.
[19] 闫培雷, 葛兴来, 王惠民, 等. 弱电网下新能源并网逆变器锁相环参数优化设计方法[J]. 电网技术, 2022, 46(6): 2210-2221.
YAN P L, GE X L, WANG H M, et al.PLL parameter optimization design for renewable energy grid-connected inverters in weak grid[J]. Power system technology, 2022, 46(6): 2210-2221.
[20] NAIR A, KAMALASADAN S, GEIS-SCHROER J, et al.An investigation of grid stability and a new design of adaptive phase-locked loop for wind-integrated weak power grid[J]. IEEE transactions on industry applications, 2022, 58(5): 5871-5884.
[21] ZOU Z X, BESHELI B D, ROSSO R, et al.Interactions between two phase-locked loop synchronized grid converters[J]. IEEE transactions on industry applications, 2021, 57(4): 3935-3947.
[22] 李胜, 袁小明, 黄晨辉. 基于交叉耦合锁相环的多频带滤波器:一种检测系统多时间尺度振荡的自适应滤波器[J]. 中国电机工程学报, 2020, 40(16): 5282-5291.
LI S, YUAN X M, HUANG C H.A multi-band filter based on cross-coupled PLL structure: an adaptive filter for fast detection of multi-timescale oscillations in power systems[J]. Proceedings of the CSEE, 2020, 40(16): 5282-5291.
[23] 胡祺, 付立军, 马凡, 等. 弱电网下基于锁相控制并网变换器小扰动同步稳定分析[J]. 中国电机工程学报, 2021, 41(1): 98-108, 401.
HU Q, FU L J, MA F, et al.Small signal synchronizing stability analysis of PLL-based VSC connected to weak AC grid[J]. Proceedings of the CSEE, 2021, 41(1): 98-108, 401.
[24] LIN X F, YU J R, YU R X, et al.Improving small-signal stability of grid-connected inverter under weak grid by decoupling phase-lock loop and grid impedance[J]. IEEE transactions on industrial electronics, 2022, 69(7): 7040-7053.
[25] XIE Z W, CHEN Y D, WU W H, et al.Stability enhancing voltage feed-forward inverter control method to reduce the effects of phase-locked loop and grid impedance[J]. IEEE journal of emerging and selected topics in power electronics, 2021, 9(3): 3000-3009.
[26] ZHANG X G, FU S D, CHEN W J, et al.A symmetrical control method for grid-connected converters to suppress the frequency coupling under weak grid conditions[J]. IEEE transactions on power electronics, 2020, 35(12): 13488-13499.
[27] YANG D S, WANG X F, LIU F C, et al.Symmetrical PLL for SISO impedance modeling and enhanced stability in weak grids[J]. IEEE transactions on power electronics, 2020, 35(2): 1473-1483.
[28] ZHOU S Y, ZOU X D, ZHU D H, et al.An improved design of current controller for LCL-type grid-connected converter to reduce negative effect of PLL in weak grid[J]. IEEE journal of emerging and selected topics in power electronics, 2018, 6(2): 648-663.
[29] NIAN H, HU B, XU Y Y, et al.Analysis and reshaping on impedance characteristic of DFIG system based on symmetrical PLL[J]. IEEE transactions on power electronics, 2020, 35(11): 11720-11730.
[30] GOLESTAN S, MONFARED M, FREIJEDO F D.Design-oriented study of advanced synchronous reference frame phase-locked loops[J]. IEEE transactions on power electronics, 2013, 28(2): 765-778.