In order to reduce the harmonic content of the generator,this article presented a method of controlling small-power diesel generator harmonic excitation based on automatic control.Firstly,the multivariate empirical mode decomposition(MEMD)was used to preprocess the three-phase current,and then the multivariate multi-scale fuzzy entropy(MMFE)transformation was performed on the preprocessed current signal to obtain a MEMD-MMFE entropy area.According to the entropy area,the harmonic excitation inrush current was identified,so that the changes of cur-rent under abnormal and normal conditions could be obtained.Moreover,special requirements of harmonic excitation principle for stator current were analyzed,and the modulation strategy of third harmonic injection was researched based on vector hexagonal SVPWM modulation.Meanwhile,proportional resonance control was introduced to complete the automatic control of harmonic excitation for small-power diesel generators.Simulation results show that the pro-posed method has good performance of automatic control.And the harmonic content in small-power diesel generators controlled by the above method is significantly improved.
关键词
小功率/柴油发电机/谐波励磁/自动控制/多元经验模态分解
Key words
Small power/Diesel generator/Harmonic excitation/Automatic control/Multivariate empirical mode decomposition
维普
万方数据