无需虚拟正交量的单相并网逆变器矢量控制  

Vector Control of Single-Phase Grid-Connected Inverters Without Virtual Orthogonal Quantities

作　　者：亓才 王萍[1] 贝太周[1] 王慧慧[1] 李楠[1] 

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072

出　　处：《电网技术》2015年第12期3470-3476,共7页Power System Technology

基　　金：高等学校博士学科点专项科研基金资助项目(2012 0032110070)~~

摘　　要：同步旋转坐标系下的PI控制已经在三相系统中得到了广泛的应用。然而,对于单相并网逆变器,由于主电路缺少一个自由度,无法直接通过传统坐标变换将交流量转换成直流量。传统的解决方案是通过将实际物理量延时1/4个电网周期构造虚拟正交量,该方法会恶化系统的动态响应。通过分析并网电流交流量与直流量之间的关系,构建了一种基于变步长最小均方算法的静止/旋转坐标变换策略,无需构造虚拟正交量。在所提策略的基础上增加了预测环节,提高了系统的动态响应速度。仿真与样机试验验证了所提控制策略的有效性。PI regulators in rotating reference frame are widely used for current regulation of three-phase systems. Since traditional stationary-to-rotating reference-frame transformation requires two orthogonal signals, such transformation cannot be directly applied to single-phase systems as variables in single-phase system contain only one component. Common approach is to create virtual quantities orthogonal to existing physical ones by phase shifting the physical ones a quarter of fundamental period. However, current delaying usually deteriorates system dynamic response. This paper presents a new stationary-to-rotating reference-frame transformation strategy based on variable step-size least mean square（LMS） algorithm via analysis of relationship between AC and DC quantities. This strategy does not need virtual orthogonal quantities. Adding forecast link into the proposed strategy, system dynamic response speed is improved significantly. Simulation and experimental results verify its effectiveness.

关 键 词：单相逆变器 矢量控制 幅值检测 变步长最小均方算法 坐标变换 

分 类 号：TM464[电气工程—电器]