Research on active buffered inverter power decoupling technology
In order to realize a single-stage single-phase boost inverter and effectively suppress the second-ary ripple current on the DC side,a current inverter circuit topology with source buffer was proposed.Six circuit modes of the inverter were investigated and two-modal modulation strategies and three-modal mod-ulation strategies were proposed.A model prediction control strategy under the two modulation strategies was designed,and design guidelines for the parameters of the main circuit were provided.The two modu-lation strategies were compared and analyzed in terms of the maximum pulsation of the storage inductor current and the secondary ripple content.It is concluded that the three-modal modulation strategy has a better ripple suppression effect.The inverter under the two modulation strategies was simulated and ana-lyzed,and the simulation results show that the total harmonic distortion rate of the output voltage,the rel-ative pulsation and dual frequency content of the inductor current under three-mode modulation are lower than those under two-mode modulation.A 500VA 48VDC/220V50HzAC active buffered single-stage sin-gle-phase boost inverter experimental setup was designed and constructed,and the experimental wave-forms of the inverter based on the model predictive control under the three-mode modulation were given,which further confirms that the proposed research scheme has the ability of secondary ripple suppression while realizing the single-stage boost inverter.
single phase invertersingle-stage boostermodulation strategyactive bufferpower decou-plingmodel predictive control
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