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机构地区:[1]三峡大学电气与新能源学院,湖北宜昌443002
出 处:《电气传动》2017年第11期50-54,共5页Electric Drive
摘 要:由于双馈风力发电机的定子绕组直接与电网相连,容易受到电网电压故障的影响。主要的DFIG低电压穿越技术有灭磁控制和撬棒控制等。灭磁控制是通过控制转子侧变换器(RSC)来获得适当的转子磁场,以抵消定子磁链中的暂态分量。由于RSC的容量限制,灭磁控制只能穿越轻微的电压跌落故障。对于严重的电网电压跌落故障,更常用的方法是使用撬棒电路将RSC旁路。但使用撬棒电路只能保证双馈风电系统的安全,无法协助电网电压恢复。提出一种灭磁控制与撬棒电路联合的LVRT方案,并使用Matlab/Simulink软件进行了仿真实验,仿真结果表明所提方案有助于提高双馈风电系统的LVRT能力。Because the stator windings of doubly-fed induction generator is connected with the power grid directly,it is easy to be affected by the voltage fault of the grid. The main low-voltage ride-through technology of DFIG has de-excitation control and crowbar control etc. By controlling the rotor side converter(RSC),the de-excitation control obtains an appropriate rotor magnetic field to offset the transient component in the stator flux. Because of the rotor side converter capacity limit,de-excitation control can only pass through slight voltage sags. A more common approach for severe grid voltage sag failures is that a crowbar circuit is used to bypass the rotor side converter. But the use of crowbar circuit can only ensure the safety of double-fed wind power system,can not help grid voltage recovery. A de-excitation control and crowbar circuit combination LVRT scheme was proposed,and a simulation experiment was carried out using Matlab/Simulink software. The simulation results show that the proposed scheme can improve the LVRT capability of DFIG wind power system.
分 类 号:TM614[电气工程—电力系统及自动化]
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