Hybrid One-Cycle Controller for Boost PFC Rectifier

One-cycle control technique has been a prominent and suitable solution for improving power quality with the help of three-phase rectifiers. This study proposes a generalised control strategy for the three-phase power factor rectifier based on both the one-cycle control technique and the hybrid pulse-width modulation (PWM) strategy. Improvement of the performance while providing very low-current total harmonic distortion (THD) is achieved with the proposed scheme. Discontinuous and/or continuous PWM operation is possible with advantages of simplicity, robustness, and low cost. Simulation and experimental results confirm the feasibility of the proposed controller.

Section: Pfc Rectifier and Hybrid Pwm Techniquementioning

confidence: 99%

Hybrid one‐cycle control technique for three‐phase power factor control

Bento¹,

Lock

Silva

et al. 2018

“…To simplify the control structure of the grid‐connected systems, one‐cycle control (OCC)‐based three‐phase PWM boost‐type rectifiers have been proposed [10–17]. This control technique does not require the service of the PLL for current reference generation, which is useful to improve the robustness of controller.…”

Section: Introductionmentioning

confidence: 99%

Modified one‐cycle‐controlled three‐phase pulse‐width modulation rectifiers under low‐output DC voltage conditions

Wei

Chen

et al. 2014

The saddle pulse-width modulation (PWM) that can be obtained by injecting third harmonic current into sampled three-phase input currents is proposed to introduce in the conventional one-cycle control (OCC) strategy-based three-phase PWMrectifier on this study. In addition, for the three-level boost-type neutral-point-clamped structure rectifiers such as threephase Vienna rectifier, the fluctuation in the neutral-point-potential (NPP) is analysed under modified OCC strategy. The proposed control scheme can not only improve the utilisation of DC bus voltage and the efficiency of converter without sacrificing the advantages of the conventional OCC scheme, such as no phase-locked loop and constant switching frequency, but also is beneficial to suppress the ripple in the DC-link voltage. Moreover, the neutral-point voltage loop is added in the proposed OCC scheme, and the neutral-point voltage controller is employed for controlling the unbalance DC voltage in the NPP which caused by the non-uniformity of parameters of components. The validity of the theoretical analysis and feasibility of the modified OCC strategy are verified by system simulation and experimental results based on a 5-kW prototype.

“…To simplify the control structure of the grid‐connected systems, one‐cycle control (OCC) based three‐phase PWM boost‐type rectifiers have been proposed [10–17]. Instead of a current controller a modulator is used in the controller, where the measured input current is compared with a suitable carrier to derive the required gating pulses for the rectifier switches.…”

Section: Introductionmentioning

confidence: 99%

Modified one‐cycle‐controlled three‐phase pulse‐width modulation rectifiers with a reduced switching frequency to power line frequency ratio

Wei

Chen

et al. 2014

In the aircraft power systems with 360-800 Hz line frequency or medium-and high-power three-phase pulse-width modulation (PWM) rectifier applications operating at the utility line frequency (50/60 Hz), the ratio of switching frequency to power line frequency will be reduced because of the increased line frequency or low switching frequency. Therefore the assumptions that the average voltage drop across the input inductor of the PWM rectifiers can be neglected if the conventional one-cycle controlled (OCC) method had been adopted can no longer be true anymore, which will deteriorate the system power factor (PF) dramatically. To solve this issue, a modified OCC scheme is proposed in this study. The proposed control method can improve the input PF of three-phase PWM rectifier without sacrificing the advantages of the conventional OCC scheme, such as no phase-locked loop and constant switching frequency. The control equation of the modified OCC method, which considered the voltage drop across the input inductor, is first derived. The theoretic analysis is supported by the experimental verification performed by a 2.5 kW modified OCC-based three-phase three-switch Vienna rectifier.