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To solve the issue of neutral-point (NP) balancing in the three-level NP-clamed inverter, a novel carrier-based pulsewidth modulation (CPWM) strategy of double modulation waveforms is proposed in this paper. By combining the injection of zero-sequence voltage with the decomposition of modulation waveform organically, NP balancing is achieved over full range of inverter output voltages and load angles...
This paper proposes a novel switched-capacitor balancing topology with an auxiliary inductor to reduce the total energy loss and improve the efficiency. More specifically, the balancing circuit couples the switched capacitor and the auxiliary inductor together to form a resonant switch unit. The simulation model of the resonant circuit is established and analyzed. Experiments also are performed to...
Shunt Active Power Filters (APFs) are suitable to compensate current-type harmonics generated by nonlinear load, but large power and high compensation precision is difficult to be obtained due to low switching frequency of high power switch devices e.g. IGBTs and phase lag of digital control loop. In this paper, a high equivalent switching frequency is obtained in spite of low real switching frequency...
In active power filter (APF) application, LCL-filters are prevalently served as output filters due to high slew rate of compensation current and sufficient attenuation ratio for switching frequency with small LC parameters. In order to realize the stable control of LCL filters, appropriate damping is required. Both the classical PI control method with a damping resistor and active damping without...
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