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基于改進(jìn)型QPR的并網(wǎng)逆變器復(fù)合控制策略

來(lái)源:電工電氣發(fā)布時(shí)間:2024-04-07 13:07瀏覽次數(shù):418

基于改進(jìn)型QPR的并網(wǎng)逆變器復(fù)合控制策略

李圣清1,2,蔣興龍1,2
(1 湖南工業(yè)大學(xué) 電氣與信息工程學(xué)院,湖南 株洲 412007;
2 湖南省光伏智能電網(wǎng)控制工程研究中心,湖南 株洲 412007)
 
    摘 要:針對(duì)準(zhǔn)比例諧振(QPR)控制對(duì)高次諧波和直流抑制能力差等問(wèn)題,提出了一種改進(jìn)型QPR控制與直流前饋補(bǔ)償?shù)膹?fù)合控制策略。該策略在QPR控制的基礎(chǔ)上加入了高次諧波補(bǔ)償,并在控制基波電流的電流外環(huán)上加入含積分控制器的直流分量補(bǔ)償環(huán)節(jié)。在對(duì)并網(wǎng)電流所含3、5、7次諧波進(jìn)行抑制的同時(shí),降低了并網(wǎng)電流中所含直流分量。仿真結(jié)果表明,與QPR控制相比,所提控制策略直流含量從0.05 降為0.01,總諧波畸變率下降了1.48%,具有較好的抑制效果。
    關(guān)鍵詞: 單相并網(wǎng)逆變器;LCL 濾波器;諧波抑制;準(zhǔn)比例諧振;復(fù)合控制
    中圖分類號(hào):TM464     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2024)03-0015-06
 
Composite Control Strategy of Grid-Connected
Inverter Based on Improved QPR
 
LI Sheng-qing1,2, JIANG Xing-long1,2
(1 College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2 Hunan Photovoltaic Smart Grid Control Engineering Research Center, Zhuzhou 412007, China)
 
    Abstract: Aiming at the problems of poor ability of Quasi-Proportional Resonance (QPR) control to suppress higher harmonics and DC,this paper proposed a composite control strategy of improved QPR control and DC feed-forward compensation. In this strategy, the higher harmonic compensation is added on the basis of QPR control, and the DC component compensation link with integral controller is added to the current outer ring controlling the fundamental current. While suppressing the 3rd, 5th, and 7th harmonics contained in the grid-connected current, the DC component in the grid-connected current is reduced. The simulation results show that compared with QPR control, the DC content of the proposed control strategy is reduced from 0.05 to 0.01, and the total harmonic aberration rate decreases by 1.48%, which has a better suppression effect.
    Key words: single-phase grid-connected inverter; LCL filter; harmonic suppression; quasi-proportional resonance; composite control
 
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