Power decoupling method with robust voltage control strategy for electric vehicle applications
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ORIGINAL ARTICLE
Power decoupling method with robust voltage control strategy for electric vehicle applications Dong‑Hee Kim1 · Sung‑Min Park1 Received: 12 March 2020 / Revised: 30 July 2020 / Accepted: 8 August 2020 © The Korean Institute of Power Electronics 2020
Abstract Active power decoupling circuits have emerged to eliminate the inherent ripple power at twice the grid frequency in singlephase power electronics systems. However, this requires additional passive components and power switches, which increases the cost and volume of the system. This paper proposes a circuit configuration in an electric vehicle system to build power decoupling circuits that employ a reduced number of extra components. In this proposed circuit configuration, three inductors and six switching devices from the motor and the inverter circuit are used to build active power decoupling circuits during battery charging time. In addition, this paper proposes a robust voltage control method with a virtual d–q current controller and the interleaved pulse width modulation technique. The proposed system and its control method can improve control performance and achieve low-cost battery chargers with a high power density. MATLAB–Simulink simulations and experimental verifications based on hardware-in-the-loop-simulations and rapid-control-prototyping systems are performed to verify the effectiveness of the proposed system and control algorithm. Keywords Active power decoupling (APD) circuit · Electric vehicle · On-board charger (OBC) · Parallel APD operation
1 Introduction With the growing electric vehicle (EV) market, low-cost onboard chargers (OBCs) are becoming an important issue for developing electric vehicles (EV) [1, 2]. Since EV OBCs need to deliver constant power to batteries from ac-side instantaneous power containing secondary-ripple power, a power decoupling circuit as shown in Fig. 1 is required [2]. Otherwise, the ripple power can potentially cause overheating of batteries. Conventionally, aluminum electrolytic capacitors with large capacitances are placed in the dclink to absorb ripple power. This is called a passive power decoupling circuit. However, bulky electrolytic capacitors are undesirable from the power density perspective. In addition, it is well known that electrolytic capacitors are vulnerable under high-temperature operation, making them one of the weakest components in an electric system. Thus, they can decrease reliability and shorten the lifespans of systems. Recently, active power decoupling (APD) circuits have been * Sung‑Min Park [email protected] 1
Department of Electronics and Electrical Engineering, Hongik University, Sejong, South Korea
introduced to address these problems. Since these circuits consisted of several switching devices and passive components such as inductors and capacitors allow large power fluctuation, a much smaller energy storage unit in the dc link can be used. In this regard, an APD circuit can enable the replacement of large electrolytic capacitors with film capacitors that
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