Reviewing the Performance of an Improved Seven-Level Multilevel Inverter for Various Pulse Width Modulation Techniques
Multilevel inverter has become a unique choice in industries at high-power applications. It is mainly due to the high-quality output waveform. Conventional MLIs use many power switches and the design of such a topology is not economical. An improved singl
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Abstract Multilevel inverter has become a unique choice in industries at high-power applications. It is mainly due to the high-quality output waveform. Conventional MLIs use many power switches and the design of such a topology is not economical. An improved single-phase MLI is suggested in this article. The circuit consists of reduced number of power switches and hence it possesses a simple control circuitry. The appealing feature of the designed circuit is only a single power switch is switched at a high frequency at anytime during the operation. It minimizes the electromagnetic interference and switching losses in the circuit. The performance of the said topology is investigated using sinusoidal pulse width modulation (SPWM) techniques in Simulink software. The performance of the proposed converter is compared with different PWM techniques.
Keywords Seven-level inverter SPWM techniques Modulation frequency ratio Side band harmonics
Total harmonic distortion
K. Aroul S. Umashankar K.R. Prabhu (&) School of Electrical Engineering, Vellore Institute of Technology (VIT) University, Vellore, Tamil Nadu, India e-mail: [email protected] K. Aroul e-mail: [email protected] S. Umashankar e-mail: [email protected] P. Sanjeevikumar Department of Electrical and Electronics Engineering, University of Johannesburg, Auckland Park, Johannesburg, South Africa e-mail: [email protected] P. Sanjeevikumar Research and Development, Power Electronics Division, Ohm Technologies, Chennai, India © Springer Nature Singapore Pte Ltd. 2018 A. Kalam et al. (eds.), Advances in Electronics, Communication and Computing, Lecture Notes in Electrical Engineering 443, https://doi.org/10.1007/978-981-10-4765-7_51
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1 Introduction Multilevel inverter has been receiving a wide attention due to its lesser electromagnetic interference and reduced harmonic distortion. The most frequent MLIs discussed in the literature are diode-clamped, flying capacitor and cascaded H-Bridge MLI. Diode-clamped MLIs have an uneven transitional DC voltage levels. This leads to a distortion in the output waveform producing more harmonics in the system. The number of diodes used for such an inverter at higher level is significantly very high than the other techniques [1, 2]. Flying capacitor MLI is similar to its predecessor, with its diode being replaced by capacitor. This topology also faces a similar disadvantage requiring additional capacitors at higher levels increasing the complexity of the circuit [3, 4]. Cascaded H-Bridge topology has been gaining popularity in recent times since a minimum number of components are required for a given level [5–8]. Many control strategies are used to improve the performance of the converters [9–11]. Higher levels in MLI demand more number of switches operating at high frequency. It leads to heavy switching losses in the topology. The prime concern in MLI design is to construct a topology that uses reduced number of switches during each level of its operation [12]. Conduction and swi
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