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    • Keywords

       

      Analytically derived closed-form expression; bus-clamping pulse width modulation; continualclamp PWM; discontinuous PWM; harmonic analysis; harmonic distortion; split-clamp PWM; pulsating torque; voltage source inverter; waveform quality.

    • Abstract

       

      Continual-clamp pulse width modulation (CCPWM) clamps each phase of a three-phase inverter to one of the two dc buses continually for 60°duration in each half of the fundamental cycle. Split-clamp pulse width modulation (SCPWM) divides the 60° clamping interval into two sub-intervals, which are not necessarily equal, and falling in two different quarter cycles. Whether continual clamp or split clamp, the positioning of the clamping interval in case of CCPWM, and the ratio of splitting the clamping interval in SCPWM – all influencethe waveform quality of the inverter output. This paper derives analytically closed-form expressions for the total RMS harmonic distortion factor and torque ripple factor pertaining to CCPWM with any arbitrary position of the clamping interval (i.e., generalized CCPWM) and also corresponding to SCPWM with any arbitrary ratio of splitting of the clamping interval (i.e., generalized SCPWM). The analytical results are well supported by experimental results on 3-hp and 5-hp induction motor drives.

    • Author Affiliations

       

      SOUMITRA DAS1 V S S PAVAN KUMAR HARI2 ARUN KUMAR3 G NARAYANAN4

      1. Department of Electrical and Electronics Engineering, National Institute of Technology Goa, Goa 403401, India
      2. Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India
      3. 3rd floor, P’DMello Road, Wadibunder, Mumbai 400010, India
      4. Department of Electrical Engineering, Indian Institute of Science, Bangalore 560012, India
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