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Harmonic Cancellation Technique (HCT) is a modulation technique which has been developed to reduce the output voltage THD of three phase voltage source inverters (VSI) when they are used to feed simultaneously both linear and non-liner loads. The HCT is based on the proper pre-distortion of the inverter output voltage in order to cancel out the low frequency harmonic content due to the non linear...
This paper presents analysis and design control scheme including the nonlinear effects of the output-filter inductor and active switches of the inverter systems. Since the filter inductance will drop dramatically when the inverter system is operated at heavy loads, system dynamic performance will vary over a wide range. Q-parameter is selected as an input variable of the control scheme to improve...
This paper proposes filter design guideline for single-phase grid-connected PV inverters. By analyzing the instantaneous voltage applied on the filter inductor, the switching ripple current through the filter inductor is precisely calculated. Therefore, filter inductance can be designed accurately which guaranties the switching ripple current under the target value. Proposed filter design method is...
In mega watts' grid connected inverter for wind turbine, challenge exists in module parallel for high power, low switching frequency and optimized design of output LCL filter. Concerning with these key issues, this paper adopts filter inductor to realize current sharing and phase shifting of carrier wave to increase equivalent switching frequency; correspondently, optimized design rule of the LCL...
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