Abstract：A multiple feedback loop control scheme for micro source inverters in Microgrid is developed in this paper. Based on the analysis of the inverter output impedance influenced by the line impedance parameters and the controller parameters, the voltage and the current controllers in the inner-loop are designed. The PI voltage regulator is applied to make the load voltage stable. The current loop uses the proportional regulator to improve the dynamic performance. After the output impedance is designed as an inductance impedance, the power controller in the outer-loop is produced based on the droop characteristics to achieve the wireless communication between paralleled inverters in Microgrid. With the implementation of the multiple feedback loop controller, the Microgrid can export high-quality power under the grid-connected mode. When the utility fault occurs, the Microgrid runs from grid-connected mode to islanding mode, and the designed controller will regulate the active and reactive power flow and enable power sharing between the paralleled micro sources in the Microgrid. Also, the controller can make the conversion between different modes seamless. The simulation results show the validity of the proposed scheme.
王成山, 肖朝霞, 王守相. 微网中分布式电源逆变器的多环反馈控制策略[J]. 电工技术学报, 2009, 24(2): 100-107.
Wang Chengshan, Xiao Zhaoxia, Wang Shouxiang. Multiple Feedback Loop Control Scheme for Inverters of the Micro Source in Microgrids. Transactions of China Electrotechnical Society, 2009, 24(2): 100-107.
[1] Lasseter R, et al. White paper on integration of distributed energy resources—the CERTS microGrid concept[R/OL]. http://certs.lbl.gov/ pdf/ LBNL_50 829.pdf. [2] Lasseter R H, Piagi P. Microgrid: a conceptual solu- tion[C]. Proc. of the 35th PESC, Aachen, Germany, 2004: 4285-4290. [3] Georgakisl D, Papathanassiou S. Operation of a prototype microgrid system based on micro-sources equipped with fast-acting power electronics interfaces[C]. IEEE Conf., Aachen, Germany, 2004: 2521-2526. [4] Lasseter R, Piagi P. Providing premium power through distributed resources[C]. Proc. of the 33rd Hawaii Int. Conf. on System Science, 2000: 1-9. [5] 王志群, 朱守真, 周双喜. 逆变型分布式电源控制系统的设计[J]. 电力系统自动化, 2004, 28(24): 61- 66. [6] Caldon R, Rossetto F, Turri R. Analysis of dynamic performance of dispersed generation connected through inverter to distribution networks[C]. 17th International Conference on Electricity Distribution, CIRED, Barcelona, 2003: 12-15. [7] Barsali S, Ceraolo M, Pelacchi P, et al. Control techniques of dispersed generators to improve the contin- uity of electricity[C]. IEEE Power Engineering Society Winter Meeting, 2002: 789-794. [8] Illindala M S, Piagi P, Zhang H. Hardware development of a laboratory-scale microgrid phase 2: operation and control of a two-inverter microgrid[R]. Mar 2004. [9] Piagi P, Lasseter Robert H. Autonomous control of microgrids[C]. IEEE PES Meeting, Montreal, 2006: 1-8. [10] Engler A. Applicability of droops in low voltage grids[J]. Int. J. Distrib Energy Res, 2005, 1(1): 1-6. [11] 王崇武, 任章, 李宏, 等. 三相SPWM逆变电路输出波滤波器的分析与设计[J]. 西安工程科技学院学报, 2002, 16(3): 247-250. [12] 王长勇, 张寅孩, 张仲超. 电流源有源滤波器中LC滤波器的特性及其设计[J]. 通信电源技术, 2000(4): 12-14. 作者简介: 王成山 男, 1962年生, 长江学者特聘教授, 研究方向为电力系统安全性分析、城市电网规划和配电系统自动化、分布式发电等。肖朝霞 女, 1981年生, 博士研究生, 研究方向为分布式发电。
2009, Vol. 24 
