基于光伏并網(wǎng)逆變器的一種滯環(huán)電流控制技術(shù)
高鑫,王斌,羅云雷,劉德文
(寧夏大學(xué) 物理與電子電氣工程學(xué)院,寧夏 銀川 750021)
摘 要:在三相光伏并網(wǎng)逆變器系統(tǒng)的設(shè)計(jì)中,滯環(huán)電流控制策略具有開(kāi)關(guān)頻率高、電流諧波失真較大等問(wèn)題。介紹了一種空間矢量-不對(duì)稱雙滯環(huán)電流控制方法,在 MATLAB/Simulink 仿真平臺(tái)分別搭建了基于三相靜止坐標(biāo)系下與兩相靜止坐標(biāo)下的仿真模型,在并網(wǎng)電流與電網(wǎng)電壓、開(kāi)關(guān)頻率、功率因數(shù)等方面對(duì)兩種控制策略進(jìn)行對(duì)比分析,仿真結(jié)果驗(yàn)證了空間矢量-不對(duì)稱雙滯環(huán)電流控制方法能夠在一定程度上減小開(kāi)關(guān)頻率,降低輸出電流的總諧波失真。
關(guān)鍵詞:并網(wǎng)逆變器;滯環(huán)電流控制;空間矢量-不對(duì)稱雙滯環(huán)電流控制;開(kāi)關(guān)頻率
中圖分類號(hào):TM464 ;TM615 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2021)12-0001-06
A Hysteresis Current Control Technique of
Photovoltaic Grid-Connected Inverters
GAO Xin, WANG Bin, LUO Yun-lei, LIU De-wen
(School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, China)
Abstract: The hysteresis current control strategy is a significant part of the three-phase photovoltaic grid-connected inverter system design. This part has problems, such as high switching frequency and comparatively bigger current harmonic distortion.This paper introduces a space vectorasymmetric double hysteresis current control method.This research built simulation models in the platform of MATLAB/Simulink based on a threephase static coordinate system and two-phase static coordinate system.Both control strategies are compared and analyzed from different angles, such as grid-connected current, grid voltage, switching frequency, power factor, etc.The results verify that the space vector-asymmetric double hysteresis current control method is effective.It can reduce the switching frequency, lower the total harmonic distortion of the output current.
Key words: grid-connected inverter; hysteresis current control; space vector-asymmetric double hysteresis current control; switching frequency
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