Abstract：Microgrid stability is related to system control mode and various parameters of the system. These important parameters of microgrid have some connection with impedance parameters. Therefore, the input and output impedance is an important parameter to analyze the microgrid stability. Impedance criterion is further deduced to make it easy to use. This paper also introduces a new method of impedance measurement for microgrid based on square wave current injection. In order to verify the measurement results, microgrid impedance of each part and the impedance of overall microgrid are calculated. A simulation model of the three-phase AC microgrid is developed in PSCAD. The AC system harmonic impedance measuring device is developed. Measurements verify the proposed new technique.
侯李祥, 卓放, 师洪涛, 张东. 基于系统稳定性分析的微电网阻抗测量技术[J]. 电工技术学报, 2015, 30(22): 153-162.
Hou Lixiang, Zhuo Fang, Shi Hongtao, Zhang Dong. New Techniques for Measuring Impedance Characteristics of an Islanded Microgrid Based on Stability Analysis. Transactions of China Electrotechnical Society, 2015, 30(22): 153-162.
[1] 杨琦, 马世英, 李胜, 等. 微型电网运行及控制设计[J]. 电工技术学报, 2011, 26 (S1): 268-275. Yang Qi, Ma Shiying, Li Sheng, et al. Design of microgrid operation model and control[J]. Trans- 2 actions of China Electrotechnical Society, 2011, 26(S1): 268-275. [2] 陆晓楠, 孙凯, 黄立培. 微电网系统中基于双二阶滤波器的主动阻尼方法[J]. 电工技术学报, 2013, 28(3): 261-268. Lu Xiaonan, Sun Kai, Huang Lipei. Active damping method based on bi-quad filter for microgrid applications[J]. Transactions of China Electrotechnical Society, 2013, 28(3): 261-268. [3] Iyer S V, Belur M N, Chandorkar M C. A generalized computational method to determine stability of a multi-inverter microgrid[J]. IEEE Transactions on Power Electronics, 2010, 25(9): 2420-2432. [4] Pogaku N, Prodanovic M, Green T C. Modeling, analysis and testing of autonomous operation of an inverter based microgrid[J]. IEEE Transactions on Power Electronics, 2007, 22(2): 613-625. [5] Chen C L, Lai J S, Martin D, et al. State-space modeling, analysis, and implementation of paralleled inverters for microgrid applications[C]. Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2010: 619-626. [6] Sun J. Impedance-based stability criterion for grid- connected inverters[J]. IEEE Transactions on Power Electronics, 2011, 26(11): 3075-3078. [7] Guerrero J M, Garc A De Vicu A L, et al. A wireless controller to enhance dynamic performance of parallel inverters in distributed generation system[J]. IEEE Transactions on Industrial Electronics, 2004, 19(5): 1205-1213. [8] Middlebrook R D. Input filter consideration in design and application of switching regulators[C]. IEEE Industry Applications Society Annual Meeting, Chicago, USA, 1976 . [9] Feng Xiaogang, Ye Zhihong, Xing Kun, et al. Individual load impedance specification for a stable DC distributed power system[C]. The 14th Annual Applied Power Electronics Conference and Expo- sition, March 14-18, 1999, Dallas, USA. [10] Sudhoff S D, Glover S F, Lamm P T, et al. Admittance space stability analysis of power electronic systems[J]. IEEE Transactions on Aerospace and Electronic Systems, 2010, 36(3): 965-973. [11] Liu J, Feng X, Lee F C, et al. Stability margin monitoring for DC distributed power systems via current/voltage perturbation[C]. Proceedings of IEEE Applied Power Electronics Conference, 2001: 745-751. [12] Feng X, Ye Z, Xing K, et al. Individual load impedance specification for a stable dc distributed power system[C]. Proceedings of IEEE Applied Power Electronics Conference, Dallas, TX, 1999: 923-929. [13] Feng X, Lee F C. Online measurement on stability margin of DC distributed power system[C]. Pro- ceedings of IEEE Applied Power Electronics Conference, New Orleans, LA, 2000: 1190-1196. [14] 吴涛, 阮新波. 分布式供电系统中源变换器输出阻抗的研究[J]. 中国电机工程学报, 2008, 28(3): 66-72. Wu Tao, Ruan Xinbo. Output impedance analysis of source converters in the DC distributed power system[J]. Proceedings of the CSEE, 2008, 28(3): 66-72. [15] 吕洋, 徐政. 投切电容器时的电网谐波阻抗测量方法[J]. 高电压技术, 2009, 35(7): 1780-1784. LüYang, Xu Zheng. Network harmonic impedance measurement using capacitor switching[J]. High Voltage Engineering, 2009, 35(7): 1780-1784. [16] 马瑜, 邱苍宇, 张军明, 等. 全桥DC/DC变流器模块阻抗特性研究[J]. 电工技术学报, 2007, 22(7): 42-46. Ma Yu, Qiu Cangyu, Zhang Junming, et al. Research on impedance characteristics of full bridge DC/DC converter modules[J]. Transactions of China Electro- 17 technical Society, 2007, 22(7):42-46. [17] 童立青, 钱照明, 邝乃兴, 等. 一种新型在线系统阻抗测量方法[J]. 电工技术学报, 2008, 23(1): 137-142. Tong Liqing, Qian Zhaoming, Kuang Naixing, et al. A novel on-line measurement for system impedance[J]. Transactions of China Electrotechnical Society, 2008, 23(1): 137-142. [18] 吴涛, 阮新波. 分布式供电系统中负载变换器的输入阻抗分析[J]. 中国电机工程学报, 2008, 28(12): 20-25. Wu Tao, Ruan Xinbo. Input impedance analysis of load converters in the distributed power system[J]. Proceedings of the CSEE, 2008, 28(12): 20-25. [19] Sun J. Small-signal methods for AC distributed power systems-a review [J]. IEEE Transactions on Power Electronics, 2009, 24(11): 2545-2553.
2015, Vol. 30 
