Commutation strategy for minimized common mode voltage using direct power control
Commutation strategy for minimized common mode voltage using direct power control
复制标题
使用直接功率控制最小化共模电压的换向策略
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
W. Hofmann
中科院分区：
文献类型：
--
作者：
B. Ruckert;W. Hofmann
双馈异步发电机是目前大功率风力发电系统中常用的发电机。变频器供电的感应电机的一个常见问题是轴承电流引起的轴承损坏。这个问题的根源是由快速开关转换器引起的共模电压。本文提出了一种基于直接功率控制的控制方法，而不是像EMI滤波器或绝缘轴承这样的无源解决方案，该方法结合了先进的换流策略以避免共模电压。这种控制策略不需要空间矢量调制，也不需要知道定子电阻等系统参数。只有相电流的方向必须由附加电路确定。4kW双馈风力发电机系统的实验结果验证了该方法的有效性。
Nowadays the doubly fed induction generator is often used in high power wind energy conversion systems. A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode voltage caused by the fast switching converters. Instead of a passive solution like EMI filters or insulated bearings, this paper presents a control method based on the direct power control combined with an advanced commutation strategy to avoid the common mode voltage. This control strategy needs no space vector modulation and further no knowledge of system parameters like stator resistance. Only the direction of the phase currents must be determined by an additional circuit. Experimental results for a 4kW DFIG system illustrates the effectiveness of the proposed method.