Understanding the unbalanced-voltage problem in wind turbine generation
Understanding the unbalanced-voltage problem in wind turbine generation
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DOI：
10.1109/ias.1999.801678
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发表时间：
1999-10
期刊：
影响因子：
--
通讯作者：
E. Muljadi;Deniz Yildirim;T. Batan;C. Butterfield
中科院分区：
文献类型：
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作者：
E. Muljadi;Deniz Yildirim;T. Batan;C. Butterfield
大多数风力涡轮机都配备有线路连接的感应发电机。感应发电机作为风力涡轮机发电机是非常有吸引力的，这是由于它们的低成本、坚固性以及很少或不需要维护。在恒定频率下，感应发电机在小范围的速度下操作，因此，其相对于同步速度以小范围的滑差操作。与同步发电机相比，感应发电机提供较低的刚度，从而减轻机械应力。在弱电力系统网络中，配电线路上的不平衡负载可能导致不平衡电压条件。如果感应发电机连接到不平衡的电压，则产生的定子电流将不平衡。不平衡电流在定子绕组上产生不均匀的加热（热点）。热量可能增加绕组温度，这降低了绕组的绝缘性，即，绕组的预期寿命。不平衡的电流也会在轴上产生扭矩脉动，从而导致可听噪声和额外的机械应力。本文探讨了异步发电机的不平衡电压问题。不平衡和负载的水平是变化的。本文介绍了实验和预测结果。
Most wind turbines are equipped with line-connected induction generators. Induction generators are very attractive as wind turbine generators due to their low cost, ruggedness, and the need for little or no maintenance. At constant frequency, the induction generator operates in a small range of speeds and, therefore, it operates with a small range of slips with respect to synchronous speed. Compared to a synchronous generator, an induction generator provides lower stiffness, thus alleviating the mechanical stress. In a weak power system network, an unbalanced load at the distribution lines can cause unbalanced voltage conditions. If an induction generator is connected to an unbalanced voltage, the resulting stator current will be unbalanced. The unbalanced current creates unequal heating (hot spots) on the stator winding. The heat may increase the winding temperature, which degrades the insulation of the winding, i.e., the life expectancy of the winding. Unbalanced currents also create torque pulsation on the shaft resulting in audible noise and extra mechanical stress. This paper explores the unbalanced voltage problem in an induction generator. The levels of unbalance and the loads are varied. Experimental and predicted results are presented in this paper.