标题：Separated-PI Control Strategy and Stability Analysis of a Single-phase Inverter Connected to the Grid with a LCL Filter
作者：Hou Dian-li; Zhang Qing-fan; Liu Xiao
作者机构：[Hou Dian-li; Zhang Qing-fan; Liu Xiao] Shandong Univ, Sch Control Sci & Engn, Jinan 250061, Peoples R China.
会议名称：International Conference on Sustainable Energy and Environmental Engineering (ICSEEE 2012)
会议日期：DEC 29-30, 2012
来源：ADVANCES IN ENERGY SCIENCE AND TECHNOLOGY, PTS 1-4
关键词：Grid-connected inverter; LCL filter; Control strategy; PID; Stability
摘要：Because of the powerful filtering ability the third-order LCL filters has been widely used in grid-connected inverters, but there are some problems to be solved on systems stability and control accuracy. A separated-PID control strategy has been proposed according to the PID characteristics and the structural features of a single-phase inverter connected to the grid with a LCL filter. This control strategy has some advantages as a strong dynamic tacking stability, and the system output has a small steady state error. A detailed description is presented on this control strategy applied in the single-phase grid inverter with a LCL filter. According to the Routh-Hurwitz stability criterion, the stability of a grid-connected inverter system based on the proposed control strategy has been analyzed. Finally, waveforms of this inverter have been presented through a simulation to show the steady and dynamic performance of the proposed scheme.