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A novel power electronic load (PEL) is introduced in this paper. This equipment can simulate R,L,C load as well as non-linear load. Furthermore, it can recycle the energy back to grid. Topology for single phase AC PEL, three-phase AC PEL, and DC PEL are presented firstly. Based on disadvantages of repetitive controller, an improved repetitive controller is presented to improve the dynamic performance...
This paper presents a novel digital control scheme for single-phase PWM rectifier for reducing AC-side harmonic currents and improving power factor. The proposed inner current loop is a predictive controller with a plug-in repetitive learning controller, it can achieve zero tracking error and simultaneously hold a fast response with the DC load disturbance. A digital notch filter is added to the outer...
PWM VSR is widely used in different power equipments to depress the harmonic of the ac-side current and improve power factor. In this paper, the operating principle and the control scheme of the single phase PWM rectifiers are introduced firstly, P(proportion) controller is used in the ac current control loop to ensure the ac-side current track the current reference fast, the related equations are...
In this paper mathematical model in d-q-0 coordinates is established for 3-phase 4-wire active power filter (APF) . A novel deadbeat control scheme for 3-phase 4-wire APF is proposed. Utilizing harmonic predictor, the harmonic current at the coming sampling instant can be predicted accurately. Meanwhile, the sufficient condition for keeping the repetitive harmonic predictor stable is proposed for...
To cope with increasing nonlinear loads in power system, this paper proposes an active power filter(APF) suitable for parallel operation. This APF solves the problems of capacity enlargement. This APF operates independently and has the capacity limitation function of compensating load harmonics. Furthermore, an optimal approach under capacity-limitation is provided for calculating the compensating...
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