[논문]전기차 배터리 충전기용 강인한 단위 입력 역률 제어장치

웬콩롱; 이홍희

doi:10.6113/tkpe.2015.20.2.182

[국내논문] 전기차 배터리 충전기용 강인한 단위 입력 역률 제어장치
Robust and Unity Input Power Factor Control Scheme for Electric Vehicle Battery Charger 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.20 no.2, 2015년, pp.182 - 192

웬콩롱 (School of Electrical Engineering, University of Ulsan) , 이홍희 (School of Electrical Engineering, University of Ulsan)

Abstract ▼ AI-Helper

This study develops a digital control scheme with power factor correction for a front-end converter in an electric vehicle battery charger. The front-end converter acts as the boost-type switching-mode rectifier. The converter assumes the two roles of the battery charger, which include power factor control and robust charging performance. The proposed control scheme consists of a charging control algorithm and a grid current control algorithm. The scheme aims to obtain unity input power factor and robust performance. Based on the linear average model of the converter, a constant-current constant-voltage charging control algorithm that passes through only one proportional-integral controller and a current feed-forward path is proposed. In the current control algorithm, we utilized a second band pass filter, a single-phase phase-locked loop technique, and a duty-ratio feed-forward term to control the grid current to be in phase with the grid voltage and achieve pure sinusoidal waveform. Simulations and experiments were conducted to verify the effectiveness of the proposed control scheme, both simulations and experiments.

Keyword

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가설 설정

Robust performance of the proposed control scheme in CV mode. (a) Load power alternates between 1 kW and 1.4 kW. (b) Grid voltage and current during load power changing.

제안 방법

In this paper, we develop a control scheme for the PFC boost converter in the battery charging system by taking into account both the input power factor and the output charger performance. The proposed control scheme is composed of two parts to achieve the unity input power factor and robust charging performance.
The first part located in the outer is a charging control algorithm that manages the charging voltage and charging current to satisfy the CC-CV charging method. Compared with the conventional charging control scheme, the proposed one requires only one proportional-integral (PI) controller; it is able to simplify the implementation of the control system. In addition, with a current feed-forward path, the charging power variation is totally canceled out, so that the charging system can operate robustly in all operating points.
In the simulation, the performance of the proposed control scheme is evaluated in both CC and CV modes with a 40Ω resistive load.
The proposed control scheme can be utilized in charging systems that adopt other front-end PFC converters, such as the PFC buck-based topology or the PFC symmetrical bridgeless boost rectifier-based configuration.

성능/효과

99985). Compared with the conventional control methods in [6] and [9], in which the grid current THD is in the range of 3.36% to 5.26%, the proposed control strategy significantly enhances the grid current waveform.

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