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The conversion between DC and AC power will typically introduce a low-frequency pulsation power in the DC side of single phase power converter which may create instability, lowers its efficiency, and reduces the reliability. In this paper, a novel Power Decoupling Modular (PDM) with 2 series differential decoupling capacitors at the ac side is proposed. Compared with the DC PDM, the proposed modular...
Ripple current at twice the output frequency exists at dc side in single phase inverter due to the instantaneous power imbalance between input and output power. Neutral-point voltage waveform control method is proposed in this paper to eliminate the ripple current in E-capless full-bridge inverter. With the proposed method, the pulsation power is controlled to only flow through ac capacitors and the...
Based on fixed switching frequency, a space vector modulation method is designed in order to reduce the harmonic pollution and improve the power factor of power rectifier devices. The modules for simulating algorithm and control are designed in Matlab environment. Results of simulation tests show that this modulation method can improve the utilization rate of system's DC (Direct Current) voltage,...
Power electronics based distributed power systems are more and more used in different situations. In these systems, with tight regulation, the load converters may exhibit constant power load (CPL) behavior with negative impedance, and the system stability would be degraded severely. In this paper, an active method using DC bus voltage feedforward is proposed to overcome these problems. A typical DC...
In the paper, a digital repetitive control scheme is proposed for the single-phase inverters to achieve the high-quality sinusoidal output voltages and the minimum total harmonics distortion. In the proposed control scheme, the repetitive controller is plugged into the stable state feedback controlled single-phase inverter system. The repetitive controller is designed to eliminate the periodic disturbance...
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