Abstract：Large electrolytic capacitors used in the common frequency converter usually cause many defects such as larger size, higher cost and more faults. One small electrolytic capacitor frequency converter was proposed along with its control strategy. Firstly, the converter topology structure was presented. The converter DC-link was in parallel with a small switched capacitor. Then, energy feedback specialties of an induction motor fed by the frequency converter were analyzed when the converter was controlled by different switch states. Energy feedback equation of the induction motor in the steady state was also deduced. Next, parameter calculating method of the small capacitor frequency converter was demonstrated along with its control strategy. Finally, the simulation model and the experimental system were built to verify these conclusions. Study results show that energy of the induction motor can't flow back to the DC-link of the frequency converter while the converter is controlled by a zero-voltage vector. The energy was consumed by stator resistances of the induction motor. Meanwhile, rotor speed of the induction motor declines very fast. When open circuit zero voltage vector is working, feedback energy of the induction motor is impeded by DC-link voltage of the converter and the feedback energy is very small, rotor speeds of the induction motor declines slowly. The capacitor of the proposed converter is one-tenth of the traditional on the condition that the DC-link voltage is allowed to rise one hundred volts. The experimental results verified the conclusions.
谢仕宏, 孟彦京, 高钰淇, 马汇海. 小电容变频器及感应电机回馈能量分析[J]. 电工技术学报, 2020, 35(4): 734-744.
Xie Shihong, Meng Yanjing, Gao Yuqi, Ma Huihai. Analysis About Small Capacitor Frequency Converter and Feedback Energy of Induction Motors. Transactions of China Electrotechnical Society, 2020, 35(4): 734-744.
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