基于光伏并網(wǎng)逆變器的一種滯環(huán)電流控制技術
高鑫,王斌,羅云雷,劉德文
(寧夏大學 物理與電子電氣工程學院,寧夏 銀川 750021)
摘 要:在三相光伏并網(wǎng)逆變器系統(tǒng)的設計中,滯環(huán)電流控制策略具有開關頻率高、電流諧波失真較大等問題。介紹了一種空間矢量-不對稱雙滯環(huán)電流控制方法,在 MATLAB/Simulink 仿真平臺分別搭建了基于三相靜止坐標系下與兩相靜止坐標下的仿真模型,在并網(wǎng)電流與電網(wǎng)電壓、開關頻率、功率因數(shù)等方面對兩種控制策略進行對比分析,仿真結果驗證了空間矢量-不對稱雙滯環(huán)電流控制方法能夠在一定程度上減小開關頻率,降低輸出電流的總諧波失真。
關鍵詞:并網(wǎng)逆變器;滯環(huán)電流控制;空間矢量-不對稱雙滯環(huán)電流控制;開關頻率
中圖分類號:TM464 ;TM615 文獻標識碼:A 文章編號: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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