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

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弱電網(wǎng)下逆變器間諧波振蕩特征分析與抑制方法的研究

來(lái)源：電工電氣發(fā)布時(shí)間：2025-01-07 12:07 瀏覽次數(shù)：5

弱電網(wǎng)下逆變器間諧波振蕩特征分析與抑制方法的研究

李知城1，何海鵬1，吳良弼1，陳華勝1，吳林翰1，劉俊峰2
(1 廣東電網(wǎng)有限責(zé)任公司湛江供電局，廣東 湛江 524000；
2 華南理工大學(xué) 自動(dòng)化科學(xué)與工程學(xué)院，廣東 廣州 510640)
 
    摘 要：弱電網(wǎng)下逆變器會(huì)與電網(wǎng)發(fā)生交互，產(chǎn)生間諧波振蕩，而導(dǎo)致嚴(yán)重的電能質(zhì)量問(wèn)題。建立了弱電網(wǎng)下并網(wǎng)逆變器的阻抗模型，并基于阻抗模型通過(guò)特征提取分析系統(tǒng)的穩(wěn)定性；對(duì)間諧波振蕩所引起的電能質(zhì)量問(wèn)題進(jìn)行了機(jī)理分析，依據(jù)分析結(jié)果提出了一種新型鎖相環(huán)結(jié)構(gòu)，可以抑制逆變器在弱電網(wǎng)下的間諧波振蕩，來(lái)解決其所引起的電能質(zhì)量問(wèn)題。仿真與實(shí)驗(yàn)結(jié)果表明，所提新型鎖相環(huán)結(jié)構(gòu)通過(guò)鎖相環(huán)前置帶通濾波器抑制諧波從而提升系統(tǒng)的穩(wěn)定性，且有效地減少了傳統(tǒng)鎖相環(huán)結(jié)構(gòu)所導(dǎo)致的超調(diào)問(wèn)題，與傳統(tǒng)鎖相環(huán)結(jié)構(gòu)在動(dòng)態(tài)性能上相差不大。
    關(guān)鍵詞： 逆變器；弱電網(wǎng)；間諧波振蕩；電能質(zhì)量；鎖相環(huán)結(jié)構(gòu)；帶通濾波器；特征提取
    中圖分類號(hào)：TM464 ；TM712     文獻(xiàn)標(biāo)識(shí)碼：A     文章編號(hào)：1007-3175(2024)12-0042-06
 
Research on Characteristic Analysis and Suppression Methods of
Interharmonic Oscillations for Inverters Under Weak Grid
 
LI Zhi-cheng1, HE Hai-peng1, WU Liang-bi1, CHEN Hua-sheng1, WU Lin-han1, LIU Jun-feng2
（1 Zhanjiang Power Supply Bureau of Guangdong Power Grid Co., Ltd, Zhanjiang 524000, China;
2 School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China）
 
    Abstract: Under the weak grid, the inverter will interact with the grid and generate interharmonic oscillations, which will lead to serious power quality problems. The impedance model of the grid-connected inverter under a weak grid is established, and the stability of the system is analyzed by feature extraction based on the impedance model; the mechanism of the power quality problem caused by interharmonic oscillations is analyzed, and based on the analytical results, a new phase-locked-loop structure is proposed, which can inhibit the interharmonic oscillations of the inverter under a weak grid and solve the power quality problem caused by the interharmonic oscillations. Simulation and experimental results show that the proposed new phase-locked loop structure can improve the stability of the system by suppressing the harmonics through the phase-locked loop front band-pass filter, and effectively reduce the overshooting problem caused by the traditional phaselocked loop structure, which is not much different from the traditional phase-locked loop structure in terms of dynamic performance.
    Key words: inverter; weak grid; interharmonic oscillation; power quality; phase-locked loop structure; band-pass filter; feature extraction
 
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