Constant and variable switching frequency random PWM strategies for open-end winding induction motor drive
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ORIGINAL ARTICLE
Constant and variable switching frequency random PWM strategies for open‑end winding induction motor drive Nithya Lavanya Sadhu1 · Bramhananda Reddy Teegala2 · Vijay Kumar Marapu1 Received: 19 February 2020 / Revised: 13 August 2020 / Accepted: 23 August 2020 © The Korean Institute of Power Electronics 2020
Abstract High amounts of harmonics cause noise and electromagnetic interference to nearby systems. Pulsewidth modulation (PWM) techniques are used to reduce the amount of harmonics near the multiples of switching frequencies. To trim down the noise and electromagnetic interference and improve the quality of the output voltages, different types of constant and variable switching frequency random PWM techniques for dual inverter-fed open-end winding induction motor drive configuration are discussed in this study. Moreover, the vector control technique is used along with random PWM techniques to improve the transient response of the dual inverter. Keywords Constant switching · Open-end winding induction motor · Random PWM · Variable switching
1 Introduction With the improvements in semiconductor devices, voltage source inverter-fed induction motor (IM) drives are gaining increasing popularity. Different pulsewidth modulation (PWM) techniques are applied to control the output parameters [1]. These techniques aim to improve the quality of the output voltage and reduce the common-mode voltage [2–4]. Single inverters are not suitable for driving high-power motors in high-power applications, such as ship prolusion. Consequently, multilevel inverter-fed drives are gaining importance in such applications. Among the different multilevel inverter topologies, the dual inverter topology is simple to connect and has many advantages [5, 6]. Dual inverters can be connected to both ends of the IM windings (Fig. 1). Therefore, the corresponding configuration is called dual inverter-fed open-end winding IM (OEWIM) drive. Dual inverters can be controlled in independent and dependent manners. On this basis, PWM techniques are classified as decoupled and coupled PWM * Nithya Lavanya Sadhu [email protected] 1
Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, Anantapur, AP, India
Department of Electrical and Electronics Engineering, G. Pulla Reddy Engineering College, Kurnool, AP, India
2
approaches [7, 8]. Decoupled PWM techniques provide a wide range of freedom in controlling the inverters in the drive. Various decoupled PWM techniques are implemented for dual inverter configurations. When PWM techniques are programmed at high switching frequencies to improve the quality of the output voltage, the multiples of such frequencies cause acoustic noise and interference to nearby systems [9]. Therefore, the magnitude of the harmonics at and around these multiples must be reduced. To address these issues, different random PWM techniques for dual inverter-fed drives were proposed [10–14]. However, these methods have not achieved satisfactory results. PWM techniques c
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