基于三频段阻抗重塑的LCL型并网变流器谐振抑制策略

doi:10.3969/j.issn.1008-0198.2024.06.010

湖南电力 ›› 2024, Vol. 44 ›› Issue (6): 67-75.doi: 10.3969/j.issn.1008-0198.2024.06.010

基于三频段阻抗重塑的LCL型并网变流器谐振抑制策略

冯豪哲, 夏向阳, 刘俊翔, 陈贵全, 赵晓悦

长沙理工大学电气与信息工程学院,湖南长沙 410114

收稿日期:2024-10-17 修回日期:2024-10-30 出版日期:2024-12-25 发布日期:2024-12-25
通信作者: 冯豪哲（1998）,男,硕士研究生,主要研究方向为并网逆变器谐振分析及抑制。
作者简介:夏向阳（1968）,男,博士,教授,主要研究方向为柔性直流输电控制和储能安全控制等。
基金资助:
国家自然科学基金项目(51977014); 湖南省教育厅科学研究重点项目（22A0230）

Resonance Suppression Strategy for LCL-Type Grid-Con‍nected Converter Based on Three-Frequency-Ban‍d Impedance Re‍model‍ing

FENG Haozhe, XIA Xiangyang, LIU Junxiang, CHEN Guiquan, ZHAO Xiaoyue

College of Electrical and Information Engineering,Changsha University of Science and Technology, Changsha 410114,China

Received:2024-10-17 Revised:2024-10-30 Online:2024-12-25 Published:2024-12-25

摘要/Abstract

摘要： 弱电网下采用电压前馈控制会增大并网变流器输出阻抗在交截频率处的负相移,可能导致并网电流的谐波谐振。针对这一问题,提出一种基于三频段阻抗重塑的LCL型并网变流器谐振抑制策略。该策略在电网电压前馈控制的基础上建立输出阻抗的三频段等效模型,利用三频段重塑增益因子重塑并网变流器不同频段的输出阻抗,减少输出阻抗在中频段的负相移,提高并网变流器在弱电网下的稳定运行能力。仿真结果表明,该策略保留了传统电压前馈控制对电网背景谐波的抑制能力,提高了并网系统的相位裕度,有效抑制了并网电流的谐振现象。

关键词: 弱电网, LCL并网变流器, 背景谐波电压, 三频段阻抗重塑, 电网电压前馈

Abstract: The use of voltage feed-forward control under a weak grid will increase the negative phase shift of the output impedance of the grid-connected converter at the cross-cutting frequency,which may lead to the harmonic resonance of the grid-connected current. Aiming at the problem a resonance suppression strategy for the LCL-type grid-connected converter based on the three-frequency-band impedance remodeling is proposed. The strategy establishes a three-frequency-band equivalent model of output impedance on the basis of grid voltage feed-forward control, and uses the three-frequency band reshaping gain factor to reshape the output impedance of the grid-connected converter in different frequency bands, which reduces the negative phase shift of the output impedance in the mid-frequency band,and improves the stable operation capability of the grid-connected converter under a weak power grid.Simulation results show that the strategy retains the ability of traditional voltage feed-forward control to suppress grid background harmonics, improves the phase margin of the grid-connected system, and effectively suppresses the resonance phenomenon of the grid-connected current.

Key words: weak grid, LCL grid-connected converter, background harmonic voltage, three-frequency-band impedance remodeling, grid voltage feed-forward

中图分类号:

TM46

冯豪哲, 夏向阳, 刘俊翔, 陈贵全, 赵晓悦. 基于三频段阻抗重塑的LCL型并网变流器谐振抑制策略[J]. 湖南电力, 2024, 44(6): 67-75.

FENG Haozhe, XIA Xiangyang, LIU Junxiang, CHEN Guiquan, ZHAO Xiaoyue. Resonance Suppression Strategy for LCL-Type Grid-Con‍nected Converter Based on Three-Frequency-Ban‍d Impedance Re‍model‍ing[J]. Hunan Electric Power, 2024, 44(6): 67-75.

参考文献

[1] 李国庆,刘先超,辛业春,等. 含高比例新能源的电力系统频率稳定研究综述[J]. 高电压技术,2024,50(3):1165-1181.
[2] 梁军,李传玥. 并网换流器控制模式发展及弱电网稳定研究[J]. 电网技术,2022,46(10):3703-3712.
[3] 高子鹏,肖国春,田圆媛,等. 考虑频率耦合的并网逆变器不同域控制的稳定性比较[J]. 电力系统保护与控制,2023,51(15):22-32.
[4] 杨东升,阮新波,吴恒. 提高LCL型并网逆变器对弱电网适应能力的虚拟阻抗方法[J]. 中国电机工程学报,2014,34(15):2327-2335.
[5] 杨兴武,何昕益,王涛,等. 基于阻抗分析的LCL型并网逆变器多谐振控制[J]. 电力电子技术,2021,55(9):55-58.
[6] WANG X H,RUAN X B,LIU S W,et al.Full feedforward of grid voltage for grid-connected inverter with LCL filter to suppress current distortion due to grid voltage harmonics[J]. IEEE Transactions on Power Electronics,2010,25(12):3110-3127.
[7] 徐飞,汤雨,谷伟. 弱电网条件下LCL型并网逆变器谐振前馈控制策略研究[J]. 中国电机工程学报,2016,36(18):4970-4979,5122.
[8] WANG X H,QIN K,RUAN X B,et al.A robust grid-voltage feedforward scheme to improve adaptability of grid-connected inverter to weak grid condition[J]. IEEE Transactions on Power Electronics,2020,36(2):2384-2395.
[9] 刘桂花,石桐,马田源,等. 弱电网下光伏并网逆变器自适应准PRD控制方法[J]. 电网技术,2017,41(1):112-117.
[10] 曹子恒,肖先勇,李媛,等. 弱电网下LCL型并网逆变器的自适应改进前馈控制策略[J]. 高电压技术,2020,46(5):1560-1570.
[11] XU J M,XIE S J,QIAN Q,et al.Adaptive feedforward algorithm without grid impedance estimation for inverters to suppress grid current instabilities and harmonics due to grid impedance and grid voltage distortion[J]. IEEE Transactions on Industrial Electronics,2017,64(9):7574-7586.
[12] 郑勇,唐莎莎,张丽,等. 弱电网条件下提升LCL型逆变器稳定性的控制策略[J]. 电力系统及其自动化学报,2022,34(2):71-81.
[13] Sun J.Impedance-based stability criterion for grid-connected inverters[J]. IEEE Transactions on Power Electronics,2011,26(11):3075-3078.
[14] 陈林,徐永海,王天泽,等. 弱电网下计及背景谐波的多并网逆变器阻抗重塑谐振抑制方法[J]. 电力系统保护与控制,2024,52(1):59-72.
[15] 朱坤龙,孙鹏菊,王林,等. 弱电网下LCL型并网逆变器的高鲁棒性加权平均电流控制策略[J]. 中国电机工程学报,2020,40(11):3592-3602.
[16] 魏石磊,田艳军,王毅,等. 弱电网中增强LCL逆变器稳定性的虚拟阻抗控制[J]. 高电压技术,2019,45(6):1827-1834.
[17] 金国彬,谢飞,李国庆,等. 弱电网且谐波畸变背景下分布式电源并网系统谐振抑制[J]. 电力系统保护与控制,2023,51(5):1-10.
[18] 郑嘉龙,杨鸽,陈开宇,等. LCL型多逆变器并网系统谐振研究综述[J]. 电力系统保护与控制,2022,50(21):177-186.
[19] 刘宝泉,郭华,朱一昕,等. 三相变流器无源阻尼型LCL滤波器的分析与设计[J]. 电工技术学报,2017,32(2):195-205.
[20] 金国彬,苑忠奇,李国庆,等. 基于无源性的并网逆变器扩展阻尼区域方法研究[J]. 电力系统保护与控制,2022,50(19):25-35.
[21] 徐佳,杨树德,张新闻. 基于并网电流谐波反馈的有源阻尼策略[J]. 中国电力,2023,56(8):126-135.
[22] 林盛超,熊健,贺诗明,等. 基于并网电流反馈的新型有源阻尼方法[J]. 电网技术,2021,45(3):926-936.
[23] WANG F,DUARTE J L,HENDRIX M A M,et al. Modeling and analysis of grid harmonic distortion impact of aggregated DG inverters[J]. IEEE Transactions On Power Electronics,2010,26(3):786-797.
[24] 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.

基于三频段阻抗重塑的LCL型并网变流器谐振抑制策略

Resonance Suppression Strategy for LCL-Type Grid-Con‍nected Converter Based on Three-Frequency-Ban‍d Impedance Re‍model‍ing

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