摘要
将比例积分控制(PI)和重复控制(RC)相结合的控制方案应用于一种单相分时复合级联光伏逆变器系统,以提高整个系统的静态性能。通过对重复控制内模的数学分析和系统离散域伯德图分析,在理论上指出了重复控制能实现无静差补偿,但补偿信号会滞后一周期。按提出控制方案补偿后,系统可以同时获得较好的相频特性和幅频特性。最后通过1kW样机上的实验验证了以上理论分析的正确性。
A combined control strategy of the PI and the repetitive control（RC）is proposed and applied into the time-sharing cascaded photovoltaic inverter system in order to improve the inverter＇s steady state performance.Based on the mathematical analysis on the internal model as well as on the discrete domain bode-plot,the underlying mechanism for the repetitive control to achieve zero static error compensation but result in one period delay is revealed.The proposed combined control strategy can precisely compensate the system with good phase/amplitude frequency performance.The experiments on an 1kW prototype prove the validity of the proposed control strategy.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第3期116-122,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(50707017)
上海市教委重点学科基金(J50602)
上海海事大学研究生创新基金(yc2009101)资助项目
关键词
分时
光伏逆变器
重复控制
离散域伯德图
Time-sharing
photovoltaic inverter
repetitive control
discrete Bode plot
