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

Article retrieval

文章檢索

首頁 >> 文章檢索 >> 文章瀏覽排名

弱電網下LCL型并網逆變器阻抗重塑諧振抑制策略研究

來源:電工電氣發(fā)布時間:2023-11-10 12:10 瀏覽次數(shù):151

弱電網下LCL型并網逆變器阻抗重塑諧振抑制策略研究

丁勁松1,2,姚鴻德1,李圣清1,周志飛1
(1 湖南工業(yè)大學 電氣與信息工程學院, 湖南 株洲 412007;
2 湖南科瑞變流電氣股份有限公司,湖南 株洲 412007)
 
    摘 要:針對電網電壓比例前饋控制下電網阻抗寬范圍變化易導致并網逆變器發(fā)生諧振或失穩(wěn)的問題,提出了一種改進電網電壓比例前饋與超前校正相結合阻抗重塑諧振抑制策略。該策略首先在傳統(tǒng)電網電壓比例前饋環(huán)節(jié)串聯(lián)二階廣義積分器 (SOGI),消減電網電壓比例前饋與線路阻抗耦合導致的正反饋,一定程度上提升系統(tǒng)穩(wěn)定裕度;進一步在電流前饋通道中引入超前相位校正,對系統(tǒng)相位裕度進行補償,提升逆變器等效輸出阻抗與電網阻抗交點處相角裕度,避免諧振發(fā)生,增強逆變器在電網阻抗寬范圍變化時的魯棒性,同時給出具體實現(xiàn)過程及參數(shù)設計思路,經仿真驗證了所提策略的可行性。
    關鍵詞: 弱電網;LCL 型逆變器;二階廣義積分器;相位補償;阻抗重塑
    中圖分類號:TM464     文獻標識碼:A     文章編號: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
 
參考文獻
[1] 周孝信,陳樹勇,魯宗相,等. 能源轉型中我國新一代電力系統(tǒng)的技術特征[J] . 中國電機工程學報,2018,38(7) :1893-1904.
[2] 王林,孫鵬菊,薛統(tǒng)宇,等. 一種提高 LCL 型并網逆變器電流控制性能的延時補償方法[J] . 中國電機工程學報,2020,40(19) :6320-6329.
[3] 楊明,宋明洋,張國澎,等. LCL 型并網逆變器新型電容電壓有源阻尼策略[J] . 太陽能學報,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] 陳偉,張巖,屠一鳴,等. LCL 型并網逆變器臨界無源阻尼參數(shù)設計[J] . 電力建設,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] 洪蘆誠,安閃閃,徐佳裕,等. 基于虛擬阻抗重塑的變壓器耦合逆變器控制策略[J] . 天津大學學報(自然科學與工程技術版),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] 趙清林,宋文璐,袁精,等. 弱電網中基于電流誤差信號補償?shù)牟⒕W逆變器穩(wěn)定性研究[J] . 太陽能學報,2019,40(10) :2833-2841.
[10] 李圣清,張威威. 電容電流反饋的 LCL 濾波器網壓前饋控制研究[J] . 電力電子技術,2019,53(2) :51-53.
[11] 徐永,王海云,王維慶. 弱電網下 LCLLC 濾波的并網逆變器電流優(yōu)化控制策略[J] . 可再生能源,2022,40(1) :88-93.
[12] 楊樹德,同向前,尹軍,等. 增強并網逆變器對電網阻抗魯棒穩(wěn)定性的改進前饋控制方法[J] . 電工技術學報,2017,32(10) :222-230.
[13] 于文倩,同向前,燕聰,等. 提高弱電網下 LCL 型并網逆變器穩(wěn)定性的改進電網電壓前饋策略[J] .電氣工程學報,2019,14(2) :79-85.
[14] 涂春鳴,高家元,李慶, 等. 具有復數(shù)濾波器結構鎖相環(huán)的并網逆變器對弱電網的適應性研究[J] .電工技術學報,2020,35(12) :2632-2642.
[15] 柴秀慧,張純江,趙曉君,等. 基于電網電壓全前饋的電網背景諧波抑制研究[J] . 電力電子技術,2020,54(8) :5-7.