关键词: 变频器, 电解电容, 调制波重构SPWM, 能量回馈

Abstract:

A new type of AC-DC-AC inverter with small capacitance branch topology and a technology of reconstructing SPWM by changing the corresponding modulation wave was analyzed, replacing traditional large electrolytic capacitance with small capacitance. Small capacitance no longer plays the role of filtering, but only used to absorb feedback energy. And the harmonic content of inverter output voltage was improved by using SPWM reconstruction technology. So the frequency converter has better output performance. The simulation model was built to verify the feasibility of theoretical research.

Key words: frequency converter, electrolytic capacitor, MWR-SPWM, energy feedback