Analysis of total harmonic distortion for H-bridge inverter in DC motor application

Ali, Amira Noor Farhanie (2021) Analysis of total harmonic distortion for H-bridge inverter in DC motor application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

DC motor that conducted in the four-directional operation (forward and reverse) is implemented in the wide variety of different devices and appliances of industrial machines. H-bridge or full-bridge circuit is the appropriate circuit to allow the operation of DC motor. However, DC motor represented by using resistive-inductive load (RL load) may produce a harmonic distortion problem. The harmonic can cause an energy loss and increasing heat that may deteriorate the insulation as well as decrease the efficiency of motor. Due to this, this thesis will issue the high total harmonic distortion (THD) if the improper switching is used. The RL load will perform the square waveform and sinusoidal waveform. The sinusoidal waveform can be performed by using bipolar and unipolar switching scheme. In term of current performances, the output generated in sinusoidal waveform will produce the low THD compared to the square waveform. Apart from that, the performance of the inverter depends on the control strategy adopted to generate the gate pulses. Therefore, the current control methods are used to control the inverter. This thesis presents model of proposed hysteresis current controller (HCC) for h-bridge inverter to improve the total harmonic distortion by using hysteresis current controlling method. The proposed HCC is capable for lowering the THD and to provide constant switching frequency. The step development of the analysis of total harmonic distortion for h-bridge inverter will be discussed. It focuses the PWM definition and consideration in terms of frequency modulation index and amplitude modulation index. To validate the results, MATLAB/Simulink software will be implemented. The current waveform and total harmonics distortion will be applied to analyse the performance of h-bridge inverter

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