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This paper presents a digital repetitive control (RC) scheme to minimize the even-order harmonics at the dc link voltage and odd-order harmonics in the line-side currents under distorted and unbalanced supply voltage conditions. The proposed current control scheme consists of a conventional PI and a plug-in repetitive controller. On the basis of the mathematical model of the three-phase pulsewidth-modulated...
Effective control strategies for reliable photovoltaic (PV) grid-connected systems are needed to efficiently use solar energy, an abundant and clean renewable energy source. A space vector pulse width modulation (SVPWM) has been widely applied in the current control of three-phase voltage source inverters (VSIs). The control strategy combines a constant voltage tracking method for the variable photovoltaic...
This paper proposes a four-multiple pulse width modulation (PWM) converter for grid interface, which is apply to the variable-speed constant-frequency direct-drive wind turbine systems. The paper introduces the principle of PWM converter, in order to improve DC voltage utilization, space vector pulse width modulation (SVPWM) technology is adopted. Then the advantages of the multiple based on carrier...
Multiphase motor drives are multi-dimensional systems, so multiphase vector control and SVPWM must be implemented in a multi-dimensional vector space. In this paper, multi-dimensional multiphase vector control is developed based on a novel multiphase SVPWM strategy, which could synthesize the required voltage vectors not only in d-q subspace but also in other subspaces. Therefore, all voltage and...
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