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基于电压闭环的双馈风力发电软切入控制
方太勋, 吴小丹, 杨浩, 周启文
南京南瑞继保电气有限公司,江苏 南京 211102
摘要:
传统的风力发电并网技术在并网瞬间会产生很大的冲击电流,严重威胁发电机及电力系统的安全。为研究空载并网技术,设计了一套30 kW变速恒频双馈异步风力发电机励磁控制实验系统。根据交流励磁变速恒频风力发电的运行特性,采用背靠背变流器作为双馈异步发电机(DFIG)的励磁源。分析了基于旋转坐标系统下的DFIG的数学模型,采用定子磁链定向方式的空载并网算法,由于DFIG在空载运行过程中需要消耗一部分无功来建立磁场,因此传统开环控制过程会引起定子电压控制精度不足,为此提出采用电压闭环控制方式提高空载并网过程中的定子电压精度。实验表明,该控制方法可以有效减小DFIG在并网过程中产生的冲击电流,实现控制过程软切入。
关键词:  交流励磁  变速恒频  矢量控制  空载并网  电压闭环
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Soft cutting-in control based on voltage close-loop for doubly-fed wind power
FANG Taixun, WU Xiaodan, YANG Hao, ZHOU Qiwen
NARI-Relays Electric Co.,Ltd.,Nanjing 211102,China
Abstract:
Traditional control methods of wind power generation may produce high impact current at cutting-in moment,which threatens the safety of generator and power system. In order to study the soft grid -connection technology,the experimental excitation control system of a 30 kW VSCF(Variable Speed Constant Frequency) DFIG(Doubly Ded Induction Generator) is designed. According to the operational characteristics of AC excited VSCF wind power generation,the back-to-back converter is used as the excitation source of DFIG. Based on the analysis of DFIG mathematical model in rotating coordinates system,the stator flux-oriented mode is applied in no-load cutting-in algorithm. As partial reactive power is consumed to establish magnetic field in the no-load operation of DFIG,the traditional open-loop control method may cause the inaccuracy of stator voltage. The voltage close-loop control mode is proposed to improve the accuracy of stator voltage at no-load cutting-in moment. Experimental results show that the proposed control method effectively reduces the impact current and realizes the soft cutting-in.
Key words:  AC excitation  VSCF  vector control  no-load cutting-in  voltage close-loop

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