Power Quality Analysis of Single Phase Full Bridge Rectifier Fed DC Motor Drive

Abstract: This paper provides a power quality analysis of single phase full bridge rectifier fed DC motor drive. A single phase full bridge rectifier is generally used in low voltage distribution system. It is necessary to analyse harmonic level and power factor. Here, DC motor is considered as the rectifier’s load. The THD and power factor analysis is done for different loading conditions. The first analysis is based on variation of delay angle and its effect on THD and power factor. The second analysis is based on variation of torque or the changes in mechanical load done in the motor while maintaining the delay angle as constant. These analyses are useful in quantizing the THD and power factor at various conditions. FFT analysis on the input current provides the information about the various harmonics present in the waveform. The overall analysis is done using MATLAB software.

Keywords: Thyristor (SCR), DC motor, Total harmonic distortion (THD), Power factor (PF), MATLAB software