混合励磁同步发电机电压控制原理分析与实现

为解决永磁发电机输出电压不可控的问题,研究了一种新型结构的混合励磁同步发电机.利用有限元方法计算了电机中永磁和电励磁的磁场分布.根据对永磁发电机输出电压的要求,制定了励磁调节系统的控制策略,讨论了调节过程.为验证混合励磁同步发电机的电压调节能力,设计制造了2.5 kW实验样机及励磁调节系统,并进行实验测试.结果表明:空载运行时,混合励磁同步发电机输出电压为永磁与电励磁部分的合成电势;负载运行时,随着负载的增加,通过调节励磁电流的大小改变了气隙磁通,输出电压稳定在135 V.

Principle Analysis and Implementation of Voltage Control of Hybrid Excitation Synchronous Generator

A novel hybrid excitation synchronous generator (HESG) was developed to solve the problem that the output voltage is uncontrollable in permanent magnet generator. The magnetic flux distribution of both the permanent magnet section and the excitation section in the HESG were computed using finite element method. According to the demand for the output voltage, a control strategy for the excitation regulation system was made, and the operation process of this system was discussed. To verify the output voltage control capability of the HESG, a 2.5 kW generator and its regulation circuit were designed and produced, and then tested by experiment. The experimental results show that for no-load running, the output voltage of the HESG was equal to the resultant electric potential of the permanent magnet section and the excitation section; and that for load running, the HESG was able to vary the gap flux to maintain the constant terminal voltage (135 V) by adjusting the excitation current as the load increased.