Model predictive control of nine-switch converter with output filter for independent control of two loads
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ORIGINAL ARTICLE
Model predictive control of nine‑switch converter with output filter for independent control of two loads Yi Pang1 · Jingmei Zhang1 · Dongxing Xu1 · Chang Yin1 · Zifeng Wu1 · Hexu Sun2 · Lei Pan1 Received: 23 December 2019 / Revised: 16 August 2020 / Accepted: 31 August 2020 © The Korean Institute of Power Electronics 2020
Abstract This paper proposes a model predictive control (MPC) algorithm designed for nine-switch converter with output filter (NSCOF) to control two three-phase AC loads independently. A state function of each leg of nine-switch converter (NSC) is established to characterize the internal conditions of the NSC because the traditional model of the NSCOF does not involve the interior model of the NSC. Based on the NSCOF model with the state function of each leg, a prediction model of NSCOF is constructed. The two AC terminals of NSCOF are treated as one module when the MPC is designed. The proposed MPC achieves controlling two three-phase AC loads working under different frequency modes. Furthermore, this algorithm is independent of the modulation method for reducing the difficulty of the controller design and its limits. The simulation and experimental results reveal that the steady-state and dynamic response performance of NSCOF are substantially improved using MPC. Keywords Nine-switch converter (NSC) · Model predictive control (MPC) · State function · Independent control of two loads
1 Introduction Several AC loads such as motor drives are required for independent control in industrial applications. Several independent converters are usually needed by these AC loads, which is not conducive to the reduction in the volume and cost of the system. The nine-switch converter (NSC) has been proposed in recent years. Compared with the traditional dual back-to-back pulse width modulation (PWM) topologies, the number of NSC switching devices is decreased by 25%. Thus, the volume and cost of the converter are reduced [1–3]. The NSC has two operation modes: constant frequency (CF) and different frequency (DF) [4]. CF mode means that the working frequency of two AC terminals is the same, and the phase can be the same and different. DF mode refers to different working frequencies of the two AC terminals. * Hexu Sun [email protected] 1
School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, China
School of Electrical Engineering, Hebei University of Science and Technology, Shijiazhuang, China
2
The NSC is widely used in many engineering applications, such as uninterruptible power supply systems [5], doubly fed wind generation (DFIG) systems [6, 7], unified power quality conditioner [8], hybrid electric vehicles [9], torque control [10], photovoltaic systems [11], and electrical machines [12]. In the applications, NSC’s output filters are used to filter out harmonics at a fixed frequency, but so many different harmonics are generated by unknown loads, circulating current, and noise disturbance. The controller aims to control the converter AC output v
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