Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

SUBSCRIPTION MANAGEMENT

发行征订

首页 >> 发行征订 >> 征订方式

弱电网下LCL型并网逆变器阻抗重塑谐振抑制策略研究

来源:电工电气发布时间:2023-11-10 12:10浏览次数:302

弱电网下LCL型并网逆变器阻抗重塑谐振抑制策略研究

丁劲松1,2,姚鸿德1,李圣清1,周志飞1
(1 湖南工业大学 电气与信息工程学院, 湖南 株洲 412007;
2 湖南科瑞变流电气股份有限公司,湖南 株洲 412007)
 
    摘 要:针对电网电压比例前馈控制下电网阻抗宽范围变化易导致并网逆变器发生谐振或失稳的问题,提出了一种改进电网电压比例前馈与超前校正相结合阻抗重塑谐振抑制策略。该策略首先在传统电网电压比例前馈环节串联二阶广义积分器 (SOGI),消减电网电压比例前馈与线路阻抗耦合导致的正反馈,一定程度上提升系统稳定裕度;进一步在电流前馈通道中引入超前相位校正,对系统相位裕度进行补偿,提升逆变器等效输出阻抗与电网阻抗交点处相角裕度,避免谐振发生,增强逆变器在电网阻抗宽范围变化时的鲁棒性,同时给出具体实现过程及参数设计思路,经仿真验证了所提策略的可行性。
    关键词: 弱电网;LCL 型逆变器;二阶广义积分器;相位补偿;阻抗重塑
    中图分类号:TM464     文献标识码:A     文章编号:1007-3175(2023)11-0019-07
 
Research on Impedance Reshaping and Resonance Suppression Strategy of
LCL Grid-Connected Inverters Under Weak Grid
 
DING Jin-song1,2, YAO Hong-de1, LI Sheng-qing1, ZHOU Zhi-fei1
(1 College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2 Hunan Kori Convertors Co., Ltd, Zhuzhou 412007, China)
 
    Abstract: The wide range change of grid impedance under the grid voltage proportional feed-forward control can easily lead to the resonance or instability of grid-connected inverters, so an impedance reshaping and resonance suppression strategy that combines the improved grid voltage feed-forward control with advanced correction is proposed. It first connects a Second-Order Generalized Integrator (SOGI) in the traditional grid voltage proportional feed-forward link to reduce the positive feedback caused by the coupling of grid voltage proportional feed-forward and line impedance, which improves the system stability margin to a certain extent. Then, the advanced phase correction is introduced to the current feedforward channel to compensate the system phase margin. Third, the phase angle margin at the intersection of the inverter output impedance and grid impedance is improved to avoid the resonance occurrence, the inverter robustness is strengthened with the wide range change of grid impedance, and the specific implementation process and parameter design ideas are given. Finally, the feasibility of the proposed strategy is verified by simulation experiments.
    Key words: weak grid; LCL-type inverter; second-order generalized integrator; phase compensation; impedance reshaping
 
参考文献
[1] 周孝信,陈树勇,鲁宗相,等. 能源转型中我国新一代电力系统的技术特征[J] . 中国电机工程学报,2018,38(7) :1893-1904.
[2] 王林,孙鹏菊,薛统宇,等. 一种提高 LCL 型并网逆变器电流控制性能的延时补偿方法[J] . 中国电机工程学报,2020,40(19) :6320-6329.
[3] 杨明,宋明洋,张国澎,等. LCL 型并网逆变器新型电容电压有源阻尼策略[J] . 太阳能学报,2023,44(2) :399-408.
[4] HE Yuying, WANG Xuehua, RUAN Xinbo, et al.Capacitor-Current Proportional-Integral Positive Feedback Active Damping for LCLType Grid-Connected Inverter to Achieve High Robustness Against Grid Impedance Variation[J].IEEE Transactions on Power Electronics, 2019, 34(12) :12423-12436.
[5] 陈伟,张岩,屠一鸣,等. LCL 型并网逆变器临界无源阻尼参数设计[J] . 电力建设,2022,43(1) :70-77.
[6] HE Yuying, WANG Xuehua, RUAN Xinbo, et al.Hybrid Active Damping Combining Capacitor Current Feedback and Point of Common Coupling Voltage Feedforward for LCL-Type Grid-Connected Inverter[J].IEEE Transactions on Power Electronics,2021,36(2) :2373-2383.
[7] 洪芦诚,安闪闪,徐佳裕,等. 基于虚拟阻抗重塑的变压器耦合逆变器控制策略[J] . 天津大学学报(自然科学与工程技术版),2021,54(12) :1280-1288.
[8] WANG Guoning, DU Xiong, SHI Ying, et al.Effects on oscillation mechanism and design of grid-voltage feedforward in grid-tied converter under weak grid[J].IET Power Electronics,2019,12(5) :1094-1101.
[9] 赵清林,宋文璐,袁精,等. 弱电网中基于电流误差信号补偿的并网逆变器稳定性研究[J] . 太阳能学报,2019,40(10) :2833-2841.
[10] 李圣清,张威威. 电容电流反馈的 LCL 滤波器网压前馈控制研究[J] . 电力电子技术,2019,53(2) :51-53.
[11] 徐永,王海云,王维庆. 弱电网下 LCLLC 滤波的并网逆变器电流优化控制策略[J] . 可再生能源,2022,40(1) :88-93.
[12] 杨树德,同向前,尹军,等. 增强并网逆变器对电网阻抗鲁棒稳定性的改进前馈控制方法[J] . 电工技术学报,2017,32(10) :222-230.
[13] 于文倩,同向前,燕聪,等. 提高弱电网下 LCL 型并网逆变器稳定性的改进电网电压前馈策略[J] .电气工程学报,2019,14(2) :79-85.
[14] 涂春鸣,高家元,李庆, 等. 具有复数滤波器结构锁相环的并网逆变器对弱电网的适应性研究[J] .电工技术学报,2020,35(12) :2632-2642.
[15] 柴秀慧,张纯江,赵晓君,等. 基于电网电压全前馈的电网背景谐波抑制研究[J] . 电力电子技术,2020,54(8) :5-7.