基于改进型加权电流控制的LCL型并网逆变器控制策略

doi:10.3969/j.issn.1008-0198.2023.02.007

湖南电力 ›› 2023, Vol. 43 ›› Issue (2): 39-45.doi: 10.3969/j.issn.1008-0198.2023.02.007

基于改进型加权电流控制的LCL型并网逆变器控制策略

凌志勇^1,2, 周志飞^1,3, 李圣清^1,3, 姚鸿德^1,3

1.湖南工业大学电气与信息工程学院,湖南株洲 412007;
2.国网湖南省电力有限公司株洲供电分公司,湖南株洲 412000;
3.光伏微电网智能控制技术湖南省工程研究中心,湖南株洲 412007

收稿日期:2022-11-11 修回日期:2022-12-14 出版日期:2023-04-25 发布日期:2023-05-06
作者简介:凌志勇(1968),男,高级工程师,研究方向为输电、配电、电力电子系统控制技术等。周志飞(1996),男,硕士,通信作者,主要研究方向为光伏并网逆变器。
基金资助:
国家自然科学基金(51977072)

Control Strategy of LCL Grid-Connected Inverter Based on Improved Weighted Current Control

LING Zhiyong^1,2, ZHOU Zhifei^1,3, LI Shengqing^1,3, YAO Hongde^1,3

1. School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007,China;
2. State Grid Zhuzhou Power Supply Compnay, Zhuzhou 412000,China;
3. Hunan Engineering Research Center of Photovoltaic Microgrid Intelligent Control Technology, Zhuzhou 412007,China

Received:2022-11-11 Revised:2022-12-14 Online:2023-04-25 Published:2023-05-06

摘要/Abstract

摘要： 针对传统加权平均电流(weighted average current, WAC)控制策略未考虑数字控制延时使系统出现相位滞后而导致系统带宽减小、鲁棒性差的问题,提出了基于准比例谐振控制和超前补偿器结合的WAC控制策略。首先,引入电容电流反馈,抑制反向谐振峰;其次,在逆变桥传递函数处串联超前补偿器,提高系统的相位裕度;最后,应用准比例谐振控制器作为电流调节器,提高基频增益、降低系统的静态误差。经仿真验证,所提控制策略对弱电网具有良好的适应能力,并网电流谐波畸变率从1.84%降低到0.26%,增强了系统的鲁棒性、改善了并网电流的质量。

关键词: 加权电流控制, 数字控制延时, 电容电流反馈, 系统降阶, 准比例谐振控制

Abstract: Aiming at the problems that the traditional weighted average current (WAC)control strategy does not consider the digital control delay, and causes the phase lag of the system, which leads to the reduction of system bandwidth and poor robustness, the WAC control strategy of combination of quasi-proportional resonance control and lead compensator is proposed. Firstly, the capacitor current feedback is introduced to suppress the reverse resonance peak. Secondly, the lead compensator is connected in series at the transfer function of the inverter bridge to improve the phase margin of the system. Finally, the quasi-proportional resonant controller is used as a current regulator to Increase the fundamental frequency gain and reduce the static error of the system. It is verified by simulation that the proposed control strategy has good adaptability to weak power grids, and the harmonic distortion rate of grid-connected current is reduced from 1.84% to 0.26%, thereby enhancing the robustness of the system and improving the quality of grid-connected current.

Key words: weighted current control, digital control delay, capacitive current feedback, system order reduction, quasi-proportional resonance control

中图分类号:

TM464

凌志勇, 周志飞, 李圣清, 姚鸿德. 基于改进型加权电流控制的LCL型并网逆变器控制策略[J]. 湖南电力, 2023, 43(2): 39-45.

LING Zhiyong, ZHOU Zhifei, LI Shengqing, YAO Hongde. Control Strategy of LCL Grid-Connected Inverter Based on Improved Weighted Current Control[J]. Hunan Electric Power, 2023, 43(2): 39-45.

参考文献

[1]Ning He,Jun Zhang,Ye Zhu,et al.Weighted Average Current Control in a Three-Phase Grid Inverter With an LCL Filter[J].IEEE Transactions on Power Electronics,2013, 28(6):2785-2797.
[2]许津铭,谢少军,肖华锋,等.LCL滤波并网逆变器的零点配置策略[J].电源学报,2013,11(1):16-19.
[3]方天治,黄淳,陈乃铭,等. 一种提高弱电网下LCL型并网逆变器鲁棒性的相位超前补偿策略[J]. 电工技术学报,2018,33(20): 4813-4822.
[4]吴强,李欣洛,李圣清,等.LCL型光伏并网逆变器输电流复合控制策略[J].湖南电力,2021,41(5):36-41.
[5]李明,张兴,杨莹,等.弱电网下基于加权系数的电网电压前馈控制策略[J].电源学报,2017,15(6):10-18.
[6]辛征,孙树敏,何晋伟,等.基于复合电流调节的单相LCL并网逆变器控制方法[J].电力系统保护与控制,2018,46(10):123-129.
[7]赫玉莹,王学华,刘福鑫.LCL型并网逆变器分裂电流单环控制及其强鲁棒性权值设计[J].中国电机工程学报,2021,41(10):3536-3546.
[8]宋国杰, 李国进, 杨浩, 等. 基于d-q坐标系下LCL型光伏并网逆变器的PI+状态反馈控制[J]. 太阳能学报, 2020, 41(11): 135-142.
[9]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.
[10]高善诚,廖冬初,陈俊,等. 有源阻尼与无源控制的弱电网下LCL并网逆变器[J].电力系统及其自动化学报,2020,32(6):57-64.
[11]曹子恒,肖先勇,马俊鹏,等. 提高LCL型并网逆变器鲁棒性的改进型电容电流反馈有源阻尼策略[J]. 高电压技术, 2020, 46(11): 3781-3790.
[12]杨兴武,王涛, 徐依明, 等. 基于虚拟电感的LCL型并网逆变器电网电压前馈控制策略[J]. 太阳能学报, 2020, 41(11): 56-63.
[13]庄超, 叶永强, 赵强松, 等. 基于分裂电容法的LCL并网逆变器控制策略分析与改进[J]. 电工技术学报, 2015, 30(16): 85-93.
[14]王碧芳, 李尚盛, 瞿李锋, 等. LCL并网逆变器改进加权电流控制方法及其鲁棒性分析[J]. 电测与仪表, 2018,55(4): 78-86.
[15]Y. Han, Z Li P,Yang P,et al. Analysis and Design of Improved Weighted Average Current Control Strategy for LCL-Type Grid-Connected Inverters[J]. IEEE Transactions on Energy Conversion, 2017, 32(3): 941-952.
[16]孙建军,王毅,杨泽洲,等. 考虑电压前馈影响的LCL并网逆变器改进WACC加权系数计算方法[J].中国电机工程学报,2018,38(17): 5158-5166,5313.
[17]杨锋,蔡振宇. LCL滤波单相并网逆变器电流加权控制研究[J]. 电测与仪表, 2014, 51(15): 84-89.
[18]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.
[19]李玉东,李佩峰,黄鑫,等. 弱电网下WAC控制LCL并网逆变器延时补偿策略[J]. 电力系统及其自动化学报,2022,34(10):57-65.
[20]汪颖,孙建风,肖先勇,等. 改进加权平均电流反馈的LCL型逆变器控制方法[J]. 高电压技术, 2021, 47(8): 2678-2687.

基于改进型加权电流控制的LCL型并网逆变器控制策略

Control Strategy of LCL Grid-Connected Inverter Based on Improved Weighted Current Control

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 4

编辑推荐

Metrics

本文评价

[1]	张阳, 罗超逵, 易文静, 程谆. 基于准Z源模块化多电平换流器的模型预测控制[J]. 湖南电力, 2023, 43(1): 8-16.
[2]	李圣清, 唐昕昀, 朱辉, 彭晓玮, 黄心沿. 弱电网中LLCL型并网逆变器的谐波混合阻尼控制策略[J]. 湖南电力, 2022, 42(6): 54-58.
[3]	李圣清, 姚鑫, 冯浩田, 张栋, 唐昕昀. 基于复合预测的LCL型光伏逆变器无差拍控制[J]. 湖南电力, 2022, 42(4): 40-45.
[4]	李圣清, 沈志超, 彭自然, 何元铭, 谷昕鹏. 基于自适应陷波的光伏逆变器谐振抑制方法[J]. 湖南电力, 2020, 40(6): 5-.