摘要
Z源逆变器属于单级系统,具有结构简单,允许逆变桥同一桥臂上下功率器件直通,输出波形畸变小等优点,在光伏发电等输入电压变换范围比较大的场合具有很好的应用前景。在光伏并网系统中,并网电流的频繁变化将会对电网的电能质量带来负面影响。为此,本文结合单相Z源光伏并网逆变器的特点,提出了通过Z源电容电压变化来调节并网电流幅值的控制方法。该方法能够减小并网电流的波动,从而改善并网电流的波形质量。实验结果证明了该控制策略的有效性。
Z-source inverter is a single-stage system.It has some advantages such as simple structure,high reliability of the inverter for avoiding influence of the shoot-through by EMI,and small output waveform distortion.Especially,this topology applies to the occasions of large rang input voltage such as PV power generation,etc.In PV grid-connected system,the frequent change of output current will bring the negative impact on the power quality.This paper proposes the Z-source capacitor voltage-change adjustment method to control ac line current amplitude,combined with the characteristics of single-phase Z-source PV grid-connected inverter.The proposed method can improve the power quality of the grid and minimize the injected ac line current variation.The experimental results verify the validity of the proposed control strategy.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第7期97-103,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51077017)
哈尔滨市科技创新人才研究专项基金(2008RFXXG007)资助项目
关键词
光伏发电
并网逆变器
并网电流调节
Z源
Photovoltaic power generation
grid-connected inverter
grid current regulation
Z-source
