Abstract：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.
[1] Ogura K, Nishida T, Hiraki E, et al. Time-sharing boost chopper cascaded dual mode single-phase sinewave inverter for solar photovoltaic power generation system[C]. IEEE Power Electronics Specialists Conference, 2004: 4763-4767. [2] Ahmed N A, Lee H W, Nakaoka M. Dual-mode time-sharing sinewave-modulation soft switching boost full-bridge one-stage power conditioner without electrolytic capacitor DC Link[J]. IEEE Transactions on Industry Application, 2007, 43(3): 805-813. [3] Ahmed N A, Miyatake M, Lee H W, et al. Time-sharing sinewave absolute value tracking boost chopper controlled one stage power conditioner with non electrolytic capacitor DC filter link[C]. IEEE PEDS, 2005: 185-191. [4] 台达电子工业股份有限公司. 能够提供正弦波输出交流电压的不断电电源供应器: 中国, 200610077702.5[P]. 2007-10-31. [5] 吴卫民, 耿攀, 王晓丽, 等. 新型级联式分时复合高频DC/AC逆变器[J]. 电工技术学报, 2009, 24(4): 157-160. [6] Francis B A, Wonham W M. The internal model principle for linear multivariable regulators[J]. Applicat. Math, 1975, 2: 170-194. [7] Goodwin G C, Graebe S F, Salgado M E. Control system design[M]. Englewood Cliffs, NJ: Prentice- Hall, 2001. [8] Chen S, Lai Y M, Tan S C, et al. Analysis and design of repetitive controller for harmonic elimination in PWM voltage source inverter systems[J]. IET Power Electron, 2008, 1(4): 497-506. [9] Escobar G, Valdez A A, Leyva Ramos J, et al. Repetitive-based controller for a UPS inverter to compensate unbalance and harmonic distortion[J]. IEEE Transactions on Industrial Electronics, 2007, 54(1): 504-510. [10] Wang Yigang, Wang Danwei, Wang Xingcheng. A three-step design method for performance improvement of robust repetitive control[C]. American Control Conference, 2005:1220-1225. [11] Hu Haibing, Hu Qingbo, L& #x000fc; Zhengyu. A simple repetitive controller embedded in PI-based UPS for reducing total harmonic distortion with nonlinear loads[C]. IEEE PESC, 2006: 1-5. [12] Zhou Keliang, Wang Danwei, Zhang Bin, et al. Plug-in dual-mode-structure repetitive controller for CVCF PWM inverters[J]. IEEE Transactions on Industrial Electronics, 2009, 56(3): 784-791. [13] 刘飞, 邹云屏, 李辉. 基于重复控制的电压源型逆变器输出电流波形控制方法[J]. 中国电机工程学报, 2005, 25(19): 58-63. [14] 段善旭, 孙朝辉, 张凯, 等. 基于重复控制的SPWM逆变电源死区效应补偿技术[J]. 电工技术学报, 2004, 19(2): 52-63. [15] 张凯, 彭力, 熊健, 等. 基于状态反馈与重复控制的逆变器控制技术[J]. 中国电机工程学报, 2006, 26(10): 56-62. with-integral control plus repetitive control for PWM inverters[J]. Proceedings of the CSEE, 2006, 26(10): 56-62.
2011, Vol. 26 
