Abstract:Z-source inverter is a single-stage system. It has some advantages such as simple structure, high reliability of the inverter for avoiding influence of the shoot-through by EMI, and small output waveform distortion. Especially, this topology applies to the occasions of large rang input voltage such as PV power generation, etc. In PV grid-connected system, the frequent change of output current will bring the negative impact on the power quality. This paper proposes the Z-source capacitor voltage-change adjustment method to control ac line current amplitude, combined with the characteristics of single-phase Z-source PV grid-connected inverter. The proposed method can improve the power quality of the grid and minimize the injected ac line current variation. The experimental results verify the validity of the proposed control strategy.
刘鸿鹏, 王卫, 吴辉, 徐殿国. 基于Z源电容电压变化的并网电流控制策略[J]. 电工技术学报, 2011, 26(7): 97-103.
Liu Hongpeng, Wang Wei, Wu Hui, Xu Dianguo. Grid Current Control Strategy Based on Z-Source Capacitor Voltage Change. Transactions of China Electrotechnical Society, 2011, 26(7): 97-103.
[1] 吴理博, 赵争鸣, 刘建政, 等. 具有无功补偿功能的单级式三相光伏并网系统[J]. 电工技术学报, 2006, 21(1): 28-32. Wu Libo, Zhao Zhengming, Liu Jianzheng, et al. Implementation of a single-stage three-phase grid-connected photovoltaic system with reactive power compensation[J]. Transactions of China Electrotechnical Society, 2006, 21(1): 28-32. [2] 翟载藤, 程晓舫, 丁金磊, 等. 最大功率条件下串联太阳能电池电流方程的确定[J]. 中国电机工程学报, 2007, 27(14): 87-90. Zhai Zaiteng, Cheng Xiaofang, Ding Jinlei, et al. Determination of serial solar panels’ current equation based on maximum power[J]. Proceedings of the CSEE, 2007, 27(14): 87-90. [3] Yazdani A, Dashl P P. A control methodology and characterization of dynamics for a photovoltaic (PV) system interfaced with a distribution network[J]. IEEE Transactions on Power Delivery, 2009, 24(3): 1385-1393. [4] Jeyraj Selvaraj, Nasrudin A Rahim. Multilevel inverter for grid-connected PV system employing digital PI controller[J]. IEEE Transactions on Industrial Electronics, 2009, 56(1): 149-158. [5] 董密, 罗安, 卢燕. 光伏并网发电系统中逆变器的设计与控制方法[J]. 电力系统自动化, 2006, 30(20): 97-102. Dong Mi, Luo An, Lu Yan. Design and control strategies of inverters for a grid-connected photovoltaic power system[J]. Automation of Electric Power Systems, 2006, 30(20): 97-102. [6] Feng Gao, Ding Li, Poh Chiang Loh, et al. Indirect dc-link voltage control of two-stage single-phase PV inverter[C]. Energy Conversion Congress and Exposition, 2009: 1166-1172. [7] Hui Zhang, Lin Shan, Jing Ren, et al. Study on photovoltaic grid-connected inverter control system[C]. Power Electronics and Drive Systems, 2009: 210-212. [8] 丁新平, 卢燕, 钱照明, 等. Z源逆变器光伏并网系统光伏电池MPPT和逆变器并网的单级控制[J]. 电工技术学报, 2010, 25(4): 122-128, 141. Ding Xinping, Lu Yan, Qian Zhaoming, et al. Single-stage control of MPPT and grid-connected on Z-source inverter PV system[J]. Transactions of China Electrotechnical Society, 2010, 25(4): 122-128, 141. [9] Fang Zheng Peng. Z-source inverter[J]. IEEE Transactions on Industry Applications, 2003, 39(2): 504-510. [10] 崔彬, 钱照明, 丁新平, 等. Z源逆变器的电压电流双闭环控制[J]. 电力电子技术, 2007, 41(9): 1-3. Cui Bin, Qian Zhaoming, Ding Xinping, et al. A voltage-current close loop control algorithm for Z-source inverter[J]. Power Electronics, 2007, 41(9): 1-3. [11] 杨水涛, 丁新平, 张帆. Z-源逆变器在光伏发电技术中的应用[J]. 中国电机工程学报, 2008, 28(17): 112-118. Yang Shuitao, Ding Xinping, Zhang Fan. Study on Z-source inverter for photovoltaic generation system[J]. Proceedings of the CSEE, 2008, 28(17): 112-118. [12] 戚振彪, 张兴, 田新全, 等. 基于Z源逆变器的光伏发电系统研究[J]. 电力电子技术, 2009, 43(12): 40-42. Qi Zhenbiao, Zhang Xing, Tian Xinquan, et al. Study of z-source inverter for grid-connected PV systems[J]. Power Electronics, 2009, 43(12): 40-42. [13] 汤雨, 谢少军, 张超华. 改进型Z源逆变器[J]. 中国电机工程学报, 2009, 29 (30): 28-34. Tang Yu, Xie Shaojun, Zhang Chaohua. Improved Z-source inverter[J]. Proceedings of the CSEE, 2009, 29(30): 28-34. [14] 李庭远, 郑建勇, 尤鋆, 等. Z源逆变器中SVPWM技术实现的研究[J]. 通信电源技术, 2009, 26(5): 1-4, 8. Li Tingyuan, Zhen Jianyong, You Jun, et al. Study on a modified vector PWM technique based on Z-source inverter[J]. Telecom Power Technology, 2009, 26(5): 1-4, 8. [15] Chandrashekhar T, Veerachary M. Control of single-phase Z-source for a grid connected system[C]. The Third International Conference on Power Systems, 2009: 1-6. [16] Poh Chiang Loh, Mahinda Vilathgamuwa, Yue Sen Lai, et al. Pulse-width modulation of Z-source inverters[J]. IEEE Transactions on Power Electronics, 2005, 20(6): 1346-1355.