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利用虚拟阻抗改善电励磁同步发电机弱磁控制性能

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Keywords: 虚拟阻抗,弱磁控制,电励磁同步发电机,风力发电系统

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Abstract:

由于阵风的影响,电励磁直驱风力发电机可能存在超速引起的定子过电压问题,本文通过电流矢量图分析了电励磁同步发电机(EESG)的弱磁控制范围。在EESG控制系统中可以通过降低转子侧励磁电流来实现弱磁控制,但由于转子侧电感值过大导致弱磁控制响应较慢。提出一种利用虚拟电感实现快速弱磁的方法,仿真和实验结果表明基于“虚拟电感”的EESG弱磁控制方案具有较快的动态响应。

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