Islanding Detection Method Combined with PLL for Photovoltaic Grid-Connected Power System
Cai Fenghuang1, 2, 4, Zheng Biwei1, Wang Wu1, 3, 4
1. Fuzhou University Fuzhou 350108 China 2. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 3. Huazhong University of Science and Technology Wuhan 430074 China 4. Zhangzhou Kehua Technology Co., Ltd. Zhangzhou 363000 China
Abstract：Anti-islanding protection is a mandatory feature for grid-connected photovoltaic system. A new method for islanding detection is proposed, that is the adaptive PWM period disturbance(APD) which combined with PLL (phase locked loop) of grid-connected current. This method is a uniform algorithm with PLL which is equivalent to adaptive frequency drift and adaptive phase shift simultaneously. Simulation programs for the control schemes are run in PSIM software initially to see the effect of control method. Afterwards, control board is designed to control a 6kW inverter. Simulation and experimental results are also provided to show that the proposed method has advantages such as fast response, no NDZ and slight impact on power quality.
蔡逢煌, 郑必伟, 王武. 结合同步锁相的光伏并网发电系统孤岛检测技术[J]. 电工技术学报, 2012, 27(10): 202-206.
Cai Fenghuang, Zheng Biwei, Wang Wu. Islanding Detection Method Combined with PLL for Photovoltaic Grid-Connected Power System. Transactions of China Electrotechnical Society, 2012, 27(10): 202-206.
[1] IEEE Std. 929—2000, IEEE recommended practice for utility interface of photovoltaic(PV) systems[S]. Institute of Electrical and Electronic Engineers, New York, Editor. 2000. [2] Pukar Mahat, Zhe Chen, Birgitte Bak Jensen. Review of islanding detection methods for distributed generation[C]. The 3th International Conference on Deregulation and Restructuring and Power Technologies, Nanjing, 2008: 2743-2748. [3] Soo Hyoung Lee, Jung Wook Park. New islanding detection method for inverter-based distributed generation considering its switching frequency[J]. IEEE Transactions on Industry Applications, 2010, 46(5): 2089-2098. [4] 刘方锐, 康勇, 张宇, 等. 带正反馈的主动移频孤岛检测法的参数优化[J]. 电工电能新技术, 2008, 27(3): 22-25. Liu Fangrui, Kang Yong, Zhang Yu, et al. Parameter optimization for active frequency drift with positive feedback islanding detection strategy[J]. Advanced Technology of Electrical Engineering and Energy, 2008, 27(3): 22-25. [5] 刘芙蓉, 王辉, 康勇, 等. 滑模频率偏移法的孤岛检测盲区分析[J]. 电工技术学报, 2009, 24(2): 178-182. Liu Furong, Wang Hui, Kang Yong, et al. Non-detection zone of slip-mode frequency shift method[J]. Transactions of China Electrotechnical Society, 2009, 24(2): 178-182. [6] 张纯江, 伞国成, 孟慧英, 等. 一种新的自适应相位偏移并网孤岛检测方法[J]. 燕山大学学报, 2008, 32(4): 356-361. Zhang Chunjiang, Sun Guocheng, Meng Huiying, et al. A new adaptive phase shift method for islanding detection of grid-connected inverters[J]. Journal of Yanshan University, 2008, 32(4): 356-361. [7] 刘芙蓉, 康勇, 王辉, 等. 主动移相式孤岛检测的一种改进的算法[J], 电工技术学报, 2010, 25(3): 172-176. Liu Furong, Kang Yong, Wang Hui, et al. An improved active phase-shift method for islanding detection[J]. Transactions of China Electrotechnical society, 2010, 25(3): 172-176. [8] 郭小强, 赵清林, 邬伟扬, 等. 光伏并网发电系统孤岛检测技术[J]. 电工技术学报, 2007, 22(4): 157-162. Guo Xiaoqiang, Zhao Qinglin, Wu Weiyang, et al. Islanding detection method for photovoltaic grid-connected power system[J]. Transactions of China Electrotechnical society, 2007, 22(4): 157-162. [9] Lopes L A C, Sun H. Performance assessment of active frequency drifting islanding detection methods[J]. IEEE Transactions on Energy Conversion, 2006, 21 (1): 171-180. [10] 刘方锐, 康勇, 张宇, 等. 光伏并网逆变器的孤岛检测技术[J]. 电力科学与技术学报, 2009, 24(1): 8-11. Liu Fangrui, Kang Yong, Zhang Yu, et al. Investigation of islanding detection strategies for PV grid-connected converters[J]. Journal of Electric Power Science and Technology 2009, 24(1): 8-11.
2012, Vol. 27 
