Research on the Z-Source Inverter Grid-Connected Control of Micro-Grid System Based on Differential Geometry
Chen Yan1, Zhou Lin1, Lei Jian1, Gan Yuanxing2
1. State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology Chongqing University Chongqing 400030 China 2. Beibei District Supply Bureau of Chongqing Electric Power Corp. Chongqing 400700 China
Abstract：For the Z-source inverter used in the distributed generation system and its grid-connected control, the paper takes the photovoltaic system as the example. According to the nonlinear characteristic of Z-source inverter, the affine model of Z-source inverter DC-link and AC side are created. Based on the differential geometry, the proper coordinate transformation and pre-feedback are constructed, and the original nonlinear system is exact linearized, then designed linear optimal controller for the system. The inverter integrates three functions including maximum power point tracking(MPPT), step-up/down DC-side voltage and output grid-connected. The simulation and experiment are performed to validate the strategies: when input condition of the photovoltaic array changes, this method has better performance than PI control.
陈艳, 周林, 雷建, 甘元兴. 基于微分几何的微网Z源逆变器并网控制[J]. 电工技术学报, 2012, 27(1): 17-23.
Chen Yan, Zhou Lin, Lei Jian, Gan Yuanxing. Research on the Z-Source Inverter Grid-Connected Control of Micro-Grid System Based on Differential Geometry. Transactions of China Electrotechnical Society, 2012, 27(1): 17-23.
[1] Kjaer S B, Pedersen J K, Blaabjerg F. A review of single-phase grid-connected inverters for photovoltaic modules[J]. IEEE Transactions on Industry Applications, 2005, 41(5): 1292-1306. [2] Chen Y M, Hung S C, Cheng C S, et al. Multi-input inverter for grid-connected hybrid PV/ wind power system[C]. Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, Austin TX, United States, 2005, 2: 850-856. [3] Jung J W, Keyhani A. Control of a fuel cell based Z-source converter[J]. IEEE Transactions on Energy Conversion, 2007, 22 (2): 467-476. [4] Peng F Z. Z-source inverter[J]. IEEE Transactions on Industry Applications, 2003, 39 (2): 504-510. [5] Huang Yi, Shen Miaosen, Peng F Z, et al. Z-source inverter for residential photovoltaic system[J]. IEEE Transactions on Power Electronics, 2006, 21(6): 1776-1782. [6] Peng F Z, YuanX M, Fang X P, et al. Z-source inverter for adjustable speed drives[J]. IEEE Power Electronics Letters, 2003, 1(2): 33-35. [7] Gajanayake C J, Vilathgamuwa D M, Poh C L. Small-signal and signal-flow-graph modeling of switched Z-source impedance network[J]. IEEE Power Electronics Letters, 2005, 3(3): 111-116. [8] Gajanayake C J, Vilathgamuwa D M, Poh C L. Modeling and design of multi-loop closed loop controller for Z-source inverter for distributed generation[C]. 37th IEEE Power Electronics Specialists Conference, Jeju Korea, 2006: 1-7. [9] Jung J W, Dai M, Keyhani A. Modeling and control of a fuel cell based Z-source converter[C]. Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, Austin TX, US, 2005, 2: 1112-1118. [10] 陈宗祥, 蒋赢, 潘俊民, 等. 基于滑模控制的Z源逆变器在单相光伏系统中的应用[J]. 中国电机工程学报, 2008, 28(21): 33-39. Chen Zongxiang, Jiang Ying, Pan Junmin, et al. A Z-source inverter for single-phase PV system based on sliding-mode control[J]. Proceedings of the CSEE, 2008, 28(21): 33-39. [11] 丁新平, 钱照明, 崔彬等. 基于模糊PID的Z源逆变器直流链升压电路控制[J]. 中国电机工程学报, 2008, 28(24): 31-38. Ding Xinping, Qian Zhaoming, Cui Bin, et al. Fuzzy PID controller for DC-link boost voltage in Z-source inverter[J]. Proceedings of the CSEE, 2008, 28(24): 31-38. [12] 蒋立, 郑建勇. Z源光伏并网直接电流单周控制系统[J]. 电力系统自动化, 2008, 32(22): 87-90. Jiang Li, Zheng Jianyong. A direct current one-cycle control method for Z-source grid-connected photovoltaic system[J]. Automation of Electric Power Systems, 2008, 32(22): 87-90. [13] 卢强, 梅生伟, 孙元章. 电力系统非线性控制[M]. 2版. 北京: 清华大学出版社, 2008. [14] 许颇. 基于Z源型逆变器的光伏并网发电系统的研究[D]. 合肥: 合肥工业大学, 2006. [15] 曹建福, 韩崇昭, 方洋旺. 非线性系统理论及应用[M]. 2版. 西安: 西安交通大学出版社, 2006.
2012, Vol. 27 
