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标题：永磁同步风力发电机低电压穿越仿真分析 |
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作者：孙树敏，万文锋，梁得亮 |
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| 2013年第5期 访问次数：341次 |
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摘要：通过仿真分析验证了限制电阻低电压穿越策略在各种电网电压跌落情况下的有效性，并给出了限制电阻阻值选择的原则。首先从能量平衡角度分析了永磁同步发电机的故障特性，其故障危害是变流器的电容电压会不断上升，从而得出在电容两端并联限制电阻的保护措施。然后通过仿真分析了永磁同步发电机配置限制电阻后的对称故障特性和非对称故障特性，证明了限制电阻可以实现永磁同步发电机低电压穿越要求，为限制电阻的实际应用提供了理论基础。
关键词：永磁同步风力发电机；低电压穿越；限制电阻；故障特性
Abstract: One purpose of this study is to verify by means of simulation that chopper resistor is effective in improving low voltage ridethrough capacity of permanent magnet synchronous generator (PMSG) wind turbines in all kinds of voltage dips. Another purpose is to give the method to choose the value of chopper. This study analyzed the fault characteristics of PMSG wind turbines from the point of view of energy and got that the capacitor voltage of converter would keep increasing during voltage dips. Accordingly, a chopper resistor, which was installed in parallel with the capacitor, was proposed to prevent the capacitor voltage from increasing to a very high value. This study also analyzed the symmetrical and unsymmetrical fault characteristics of PMSG wind turbines through simulation when the generator was equipped with a chopper. It shows that chopper resistor is able to fulfill the demand of low voltage ridethrough capacity of PMSG wind turbines and therefore provide theoretical basis for the application of chopper resistor.
Key words: permanent magnet synchronous generator wind turbines；low voltage ridethrough；chopper resistor；fault characteristic
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