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双馈风力发电系统最大功率点跟踪控制策略

, PP. 202-208

Keywords: 变速恒频,双馈电机,最大功率点跟踪

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Abstract:

双馈风力发电系统最大功率点跟踪通常基于实验测定的最佳风速-功率-转速曲线,但在长期运行中系统参数的变化会使实际最大功率点偏离原曲线,影响最大功率跟踪效果。在分析风力机特性、双馈风力发电机数学模型及功率关系的基础上,提出了一种以向电网输出电能最大为目标、不依赖最佳风速-功率-转速曲线的最大功率点跟踪策略,实现了定子输出有功、无功解耦控制。仿真和实验证明,基于该方法,双馈风力发电系统在风速变化过程中能自动寻找并跟随最大功率点,且控制相对简单,运行可靠,有较高的实用价值。

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