基于比例复数积分控制的单相逆变器并网研究  

Research on Control Strategy of Single-phase Grid-connected Inverter Based on Proportional Complex Integral Control

作　　者：董蕾[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,光伏系统工程研究中心,安徽合肥230009

出　　处：《电气自动化》2012年第2期31-34,共4页Electrical Automation

摘　　要：设计了一种具有零稳态误差和低谐波注入的单相并网逆变器控制系统,系统的控制器由比例调节器Kp和复数积分调节器构成。与传统PI控制器相比,比例复数积分控制器(PCI)在基波频率处增益无穷大,因此可以完全消除稳态误差。通过理论分析,构造了单相系统虚拟的伪三相静止坐标系进行坐标变换,利用dq旋转坐标系实现复数域的实数化。理论分析和仿真实验结果都证明了系统具有良好的稳态性能和抗干扰性能,并且对并网电流有一定的谐波抑制作用。A novel single-phase grid-connected inverter system with zero steady-state error and low harmonic is developed in this paper. The controller is consist of a proportional regulator and a complex integral regulator. Compared with traditional PI control methods, the PCI control can produce an infinite gain at the fundamental frequency, so zero steady-state error is achieved. Transformation to DQ coordinates by using a virtual bi-phase system can introduce a conversion between real field and complex field based on theoretical analysis. Both theoretical analysis and experimental results of a simulation prototype demonstrated the high performance of the proposed system in steady-state behaviour and anti-interference. Besides, the effectiveness of proposed PCI control is proved by the restrainability to harmonic part of output current.

关 键 词：单相并网逆变器 PCI控制器 零稳态误差 dq旋转坐标系 谐波抑制 

分 类 号：TM464[电气工程—电器]