一种新型三相光伏逆变器的设计和控制  

Design and control of a new kind of three phase photovoltaic inverter

作　　者：张宁[1] 赵振民[1] 陈丽颖[1] 

机构地区：[1]黑龙江科技大学电气与控制工程学院,哈尔滨150022

出　　处：《工业仪表与自动化装置》2015年第4期54-57,共4页Industrial Instrumentation & Automation

摘　　要：随着电力电子技术的发展,各种各样的不平衡负荷连接到了电网之中,这样就会因电网电压的不平衡而导致电能质量下降,严重影响了用户的正常使用。传统的三桥臂逆变器在负载是三相对称情况下输出的电压是三相对称的。但如果是三相负载不对称的情况,就很难输出对称的三相电压。为了解决这种因不平衡负载影响电能质量的问题,采用三相四桥臂逆变器。这种逆变器可以在不平衡负荷的情况下,有效地抑制不平衡负载电流对电压的扰动,保证输出的三相电压近似对称,其控制策略是利用一种新型的三维空间矢量脉宽调制(3D-SVPWM)的方法。MATLAB验证了三相四桥臂在一定程度上能够解决在不平衡负载下输出三相对称电压的问题,它还具有结构简单、体积小、重量轻、电压利用率高的优势。With the development of power electronics technology,a variety of unbalanced load are connected to the grid,causing the grid voltage imbalance and power quality decline,seriously affect the user＇s normal use. Traditional three- leg inverter can output three- phase symmetrical voltage in the case of three- phase symmetrical load. But it is difficult to output three- phase symmetrical voltage when the three- phase load is asymmetric. In order to solve the impact of unbalanced load on the power quality,the three- phase four- leg inverter is used. This inverter can effectively suppress the unbalanced load current to voltage disturbances under the unbalanced load,to ensure approximately symmetrical three-phase voltage output,and the control method is a new type of three- dimensional space vector pulse width modulation（ 3D- SVPWM）,the MATLAB to verify the three- phase four- leg can be solved three phase output voltage problems when the three- phase load is asymmetric. At the same time,with the advantages of simple structure,small size,light weight,higher voltage utilization

关 键 词：不平衡负载 三相四桥臂逆变器 三维空间矢量调制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]