The mechanism of harmonic current injection from single-phase grid-connected converters is comprehensively investigated. The measurable impacts from grid voltage, converter commutation, power factor, PWM modulation and control strategy are demonstrated on the harmonic current injection. According to the mechanism, a tailor-made control solution which employs a low pass voltage-loop filter and internal model principle-based hybrid current controller, is proposed to eliminate the harmonic current injection from the single-phase grid-connected converters. Experiments are performed to verify the validity of the mechanism and the proposed control method. It not only presents an effective tailor-made solution to the elimination of harmonic current injection from grid-connected power converters, but also provides a mechanism-based benchmark tool to further develop rational grid requirements on the harmonic injection levels in the grid integration of distributed generation units.
This paper analyzes and models Permanent Magnet Synchronous Generator (PMSG) based wind turbine with diode rectifier + boost converter + PWM inverter based power electronic interface, and proposes corresponding control strategy that is capable of maximum power point tracking (MPPT), reactive power regulation and fault ride through (FRT) capability. Using DIgSILENT/Power Factory 14.0, simulations are carried out to show the superior features of such wind turbine and the validity of proposed control strategy.
This paper proposes a modified inverter topology called Embedded Enhanced-Boost Z-Source Inverter (EEB-ZSI). Compared with the prior-art Enhanced-Boost Z-Source Inverter (EB-ZSI), the proposed topology features that the dc sources like PV panels can be embedded into a symmetrical impedance network. In this way, the dc current becomes continuous. More importantly, the voltage stress across the switching devices is lower, while a large conversion ratio is maintained. The proposed Z-source inverter is benchmarked with selected topologies in terms of the conversion ratio, voltage gain, and stresses on the devices. Simulation and experimental results are provided to validate the analysis.
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