Abstract：The low voltage ride through (LVRT) of doubly-fed induction generator (DFIG) via excitation control during severe faults is one of the highlights in wind energy conversion system (WECS). In current most control strategies need accurate observation and fast sequence separation of flux, and will lead to the torque pulsation. After summarizing the common characteristics of various efficient low voltage ride-through control strategies on the port from the perspective of physics principle, a reverse current tracking control strategy is then proposed in this paper. The stator current multiplied by a certain coefficient is set as the reference of rotor current during the faults, which is simple in structure and can restrain the torque pulsation effectively. Case study verifies the effectiveness of the improved method. It is shown that using the proposed method, at 20% over-synchronous speed, the DFIG can achieve LVRT under 80% symmetrical fault or 100% single phase fault.
陈鉴庆, 邹旭东, 梁宗泽, 童力, 熊威, 朱东海. 基于反向电流跟踪的双馈风机低电压穿越控制策略[J]. 电工技术学报, 2016, 31(2): 221-229.
Chen Jianqing, Zou Xudong, Liang Zongze, Tong Li, Xiong Wei, Zhu Donghai. An Improved Control Strategy of Doubly-Fed Wind Turbine under Voltage Dips Based on Reverse Current Tracking. Transactions of China Electrotechnical Society, 2016, 31(2): 221-229.
[1] 王勇, 张纯江, 柴秀慧, 等. 电网电压跌落情况下双馈风力发电机电磁过渡过程及控制策略[J]. 电工技术学报, 2011, 26(12): 14-19. Wang Yong, Zhang Chunjiang, Chai Xiuhui, et al. Electromagnetic transient process and control strategy fordoubly-fed wind powergenerator under grid voltage dip[J]. Transactions of China Electrotechnical Society, 2011, 26(12): 14-19. [2] Global Wind Energy Council. Global Wind Energy Statistics2012[EB/OL]. [2013-02-17]. http://www.gwec.net/ wp-content/uploads/2013/02/GWEC-PRstats-2012_ english.pdf. [3] 苏平, 张靠社. 基于主动式IGBT型Crowbar的双馈风力发电系统LVRT仿真研究[J]. 电力系统保护与控制, 2010, 38(23): 164-171. Su Ping, Zhang Kaoshe. Simulation researchfor LVRT of DFIG with active IGBT Crowbar[J]. Power System Protection and Control, 2010, 38(23): 164- 171. [4] Tsili M, Papathanassiou S. A review of grid code technical requirements for wind farms[J]. IET Renewable Power Generation, 2009, 3(3): 308-332. [5] Joos G. Wind turbine generator low voltage ride through requirements and solutions[J]. IEEE Power and Energy Society General Meeting-Conversion and Delivery of Electrical Energy in the 21st Century, 2008: 1-7. [6] Abdel Baqi O, Nasiri A. A dynamic LVRT solution for doubly fed induction generators[J]. IEEE Transactions on Power Electronics, 2010, 25(1): 193-196. [7] 刘其辉, 贺益康, 张建华. 交流励磁变速恒频双馈型异步发电机的稳态功率关系[J]. 电工技术学报, 2006, 21(2):39-44. Liu Qihui, He Yikang, Zhang Jianhua. Steady-statepower relation of AC-excited variable-speed constant frequency doubly-fed induction generator[J]. Transactions of China Electrotechnical Society, 2006, 21(2): 39-44. [8] 李建林, 朱颖, 胡书举, 等. 风力发电系统中大功率变流器的应用[J]. 高电压技术, 2009, 35(1): 169-175. Li Jianlin, Zhu Ying, Hu Shuju, et al. Topology and modulation strategy for high power converter in wind power system[J]. High Voltage Engineering, 2009, 35(1): 169-175. [9] 蔚芳, 刘其辉, 谢孟丽, 等. 基于D/PHS的DFIG 机组LVRT 的综合控制研究[J]. 电力系统保护与控制, 2013, 41(6): 64-70. Yu Fang, Liu Qihui, Xie Mengli, et al. Study on the LVRT of the DFIG based on the D/PHS[J]. Power System Protection and Control, 2013, 41(6): 64-70. [10] 贺益康, 周鹏. 变速恒频双馈异步风力发电系统低电压穿越技术综述[J]. 电工技术学报, 2009, 24(9): 140-146. He Yikang, Zhou Peng. Overview of the low voltage ride-through technology forvariable speed constant frequency doubly fed wind power generation systems[J]. Transactions of China Electrotechnical Society, 2009, 24(9): 140-146. [11] 贺益康, 胡家兵. 双馈异步风力发电机并网运行中的几个热点问题[J]. 中国电机工程学报, 2012, 32(27): 1-15. He Yikang, Hu Jiabing. Several hot-spot issues associated with the grid-connected operations of wind-turbine driven doubly fed induction generators[J]. Proceedings of the CSEE, 2012, 32(27): 1-15. [12] 张兴, 张龙云, 杨淑英, 等. 风力发电低电压穿越技术综述[J]. 电力系统及其自动化学报, 2008, 20(2): 1-8. Zhang Xing, Zhang Longyun, Yang Shuying, et al. Low voltage ride-through technologies in wind turbine generation[J]. Proceedings of the CSU-EPSA, 2008, 20(2): 1-8. [13] 张建华, 王健, 陈星莺, 等. 双馈风机低电压穿越控制策略的分析与研究[J]. 电力系统保护与控制, 2011, 39(21): 28-33. Zhang Jianhua, Wang Jian, Chen Xingying, et al. Analysis of DFIG-based wind generation LVRT control stratrgy[J]. Power System Protection and Control, 2011, 39(21): 28-33. [14] 徐殿国, 王伟, 陈宁. 基于撬棒保护的双馈风机风电场低电压穿越动态特性分析[J]. 中国电机工程学报, 2010, 30(22): 29-36. Xu Dianguo, Wang Wei, Chen Ning. Dynamic characteristic analysis of doubly-fed induction generator low voltage ride-through based on crowbar protection[J]. Proceedings of the CSEE, 2010, 30(22): 29-36. [15] Xiang Dawei, Ran Li, Tavner P J, et al. Control of a doubly fed induction generator in a wind turbine during grid fault ride-through[J]. IEEE Transactions on Energy Conversion, 2006, 21(3): 652-662. [16] Hu Sheng, Lin Xinchun, Kang Yong, et al. An improved low-voltage ride-through controlstrategy of doubly fed induction generator during grid faults[J]. IEEE Transactions on Power Electronics, 2011, 26(12): 3653-3665. [17] Xiao Shuai, Yang Geng, Zhou Honglin, et al. An ALVRT control strategy based on flux linkage tracking for DFIG-based WECS[J]. IEEE Transactions on Industrial Electronics, 2012, 60(7): 2820-2832. [18] Lima F K A, Luna A, Rodriguez P, et al. Rotor voltage dynamics in the doubly fed induction gener- ator during grid faults[J]. IEEE Transactions on Power Electronics, 2010, 25(1): 118-130. [19] 熊小伏, 欧阳金鑫. 电网短路时双馈感应发电机转子电流的分析与计算[J]. 中国电机工程学报, 2012, 32(28): 114-121. Xiong Xiaofu, Ouyang Jinxin. Analysis and calculation of rotor currents for doubly-fed induction generators undershort circuits in power grids[J]. Proceedings of the CSEE, 2012, 32(28): 114-121.
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