Abstract
A novel control DC-DC-AC buck converter for single phase capacitor-start-run induction motor drives is presented in this paper. The objective is to minimize harmonic distortion in inverter output voltage supply to a Single Phase Induction Motor (SPIM). Here, the output of a variable duty cycle buck DC-DC converter is fed to an H-bridge inverter to generate a very close sinusoidal output voltage. Few power semiconductor switches are utilized to produce inverter output voltage with reduced harmonic distortion comparable with results achieved in multilevel inverters. The SPIM was analysed in the stationary d-q reference frame while the buck converter was operated in the Continuous Conduction Mode (CCM) to ensure that the output voltage vary exactly as the duty cycle. The simulation results show good starting transient characteristics for the SPIM and also stable operation under intermittent loading of 4 N-m. The average inverter output voltage of 157.4 V was achieved with Total Harmonic Distortion (THD) as low as 6.32%. This configuration is simple, cheap, and has reduced control complexity.
Highlights
The quality of inverter voltage supply to electrical loads has attracted considerable research attention in recent years
The circuit diagram of the proposed inverter topology is shown in Fig. 1, in which a DC-DC buck converter is coupled with a conventional H-bridge inverter
The Buck converter is operated in Continuous Current Mode (CCM) to enable the output voltage, Vo, to exactly follow the duty cycle variation
Summary
The quality of inverter voltage supply to electrical loads has attracted considerable research attention in recent years. Specific attention has been devoted to the prob- It was, observed that power loss in the circuit increases with increase in the number of output voltage levels. Apart from high switching losses (leading to reduction in efficiency), multilevel inverter topologies have other demerits, including complexity in the generation of control signals, high number of circuit components, and high weight [15], [16], and [17]. An H-bridge inverter topology with fundamental frequency control is used to invert the buck DC-DC output voltage. The research objective is to obtain inverter AC output voltage with reduced THD comparable with results obtained using multilevel inverters while employing reduced number of power semiconductor switches to offer excellent transients and steady state performance of the motor.
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