摘要
电流控制是三相并网逆变器运行的关键问题之一。为了实现快速准确的电流控制,深入分析了三相并网逆变器旋转坐标系PI控制、静止坐标系PR控制和静止坐标系PCI控制三者之间的联系和区别,证明了静止坐标系PR控制和旋转坐标系PI控制两者并不等效,探讨了静止坐标系PR控制和PCI控制在动态性能和稳态性能方面的特点,并提出一种在线平滑切换方案,有效利用两者的优势,最后搭建了基于TMS320F2812 DSP的数字控制实验平台,完成了电网电压平衡/不平衡两种情况下的实验测试,为不同工况下合理选择控制策略提供了重要的理论依据。
Current control is one of the key techniques for operating of three-phase gridconnected inverters. In order to achieve the fast and accurate current regulation, the inherent relationship and difference of the synchronous rotating frame proportional integral(PI) control, stationary proportional resonant(PR) control and proportional complex integral(PCI) control is analyzed. It reveals that the stationary PR control is not equivalent to the synchronous rotating frame PI control. Performance evaluations of stationary PR and PCI controls are carried out from the viewpoints of the steady-state and dynamic responses, and a novel online transfer solution is proposed to make full use of the advantages of both controls. Finally, the experimental platform based on TMS320F2812 DSP is built, and tests are carried out under the balanced and unbalanced grid voltage conditions. It provides a very useful guidance for the control strategy selection under specific conditions.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第4期8-14,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51307149)
河北省教育厅优秀青年基金(YQ2014010)
中国博士后科学基金(2014M551050)资助项目
