Abstract
Multilevel inverters are widely used for high power and high voltage applications. The performance of multilevel inverters are superior to conventional two level inverters in terms of reduced total harmonic distortion, higher dc link voltages, lower electromagnetic interference and increased quality in the output voltage waveform. This paper presents a single phase hybrid eleven level multilevel inverter topology with reduced switch count to compensate the above mentioned disadvantages. This paper also presents various high switching frequency based multi carrier pulse width modulation strategies such as Phase Disposition PWM Strategy (PDPWM), Phase Opposition and Disposition PWM Strategy (PODPWM), Alternate Phase opposition Disposition PWM (APODPWM), Carrier Overlapping PWM (COPWM), Variable frequency carrier PWM (VFPWM), Third Harmonic Injection PWM (TFIPWM) applied to the proposed eleven level multilevel inverter and is analyzed for RL load. FFT analysis is carried out and total harmonic distortion, fundamental output voltage are calculated. Simulation is carried out in MATLAB/SMULINK.
Highlights
In recent years, there has been a lot of increase in interest on the concept of multilevel power conversion
In this paper a new symmetrical 11 level hybrid multilevel inverter topology is proposed with different PWM techniques to obtain more accurate waveform with minimal switching losses and lower harmonic distortion
In the propose hybrid Multilevel Inverter topology the number of switches (NS) required to produce number of levels (NL) is given by eq (1) & (2) and the maximum output voltage is given by eq (3)
Summary
There has been a lot of increase in interest on the concept of multilevel power conversion. In this paper a new symmetrical 11 level hybrid multilevel inverter topology is proposed with different PWM techniques to obtain more accurate waveform with minimal switching losses and lower harmonic distortion. The fundamental structure of the proposed hybrid inverter topology is given in fig. (a). It consists of two isolated DC sources and six unidirectional switches (T1, T2, T3, T4, S1 and S2). Fig. (b) gives the proposed 11 level symmetrical novel inverter topology with reduced switch count. In the propose hybrid Multilevel Inverter topology the number of switches (NS) required to produce number of levels (NL) is given by eq (1) & (2) and the maximum output voltage is given by eq (3).
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