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Indian Institute of Science

1. Narayanan, G. Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives.

Degree: 1999, Indian Institute of Science

URL: http://hdl.handle.net/2005/139

In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work.
The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. These rules are applied to the conventional and modified forms of space vector modulation, leading to the synchronised conventional space vector strategy and the Basic Bus Clamping Strategy-I, respectively. Further, four new synchronised, bus-clamping PWM strategies, namely Asymmetric Zero-Changing Strategy, Boundary Sampling Strategy-I, Basic Bus Clamping Strategy-II and Boundary Sampling Strategy-II, are proposed. These strategies exploit the flexibilities offered by the space vector approach like double-switching of a phase within a subcycle, clamping of two phases within a subcycle etc. It is shown that the PWM waveforms generated by these strategies cannot be generated by comparing suitable 3-phase modulating waves with a triangular carrier wave.
A modified two-zone approach to overmodulation is proposed. This is applied to the six synchronised PWM strategies, dealt with in the present work, to extend the operation of these strategies upto the six-step mode. Linearity is ensured between the magnitude of the reference and the fundamental voltage generated in the whole range of modulation upto the six-step mode. This is verified experimentally.
A suitable combination of these strategies leads to a significant reduction in the harmonic distortion of the drive at medium and high speed ranges over the conventional space vector strategy. This reduction in harmonic distortion is demonstrated, theoretically as well as experimentally, on a constant V/F drive of base frequency 50Hz for three values of maximum switching frequency of the inverter, namely 450Hz, 350Hz and 250Hz.
Based on the notion of stator flux ripple, analytical closed-form expressions are derived for the harmonic distortion due to the different PWM strategies. The values of harmonic distortion, computed based on these analytical expressions, compare well with those calculated based on Fourier analysis and those measured experimentally.
*Advisors/Committee Members: Ranganathan, V T.*

Subjects/Keywords: Electrical Engineering; Power Electronics; Pulsewidth Modulation (PWM); PWM Inverter; AC Drives; Variable Speed Drives; High Power Drives; Induction Motor Drives; Synchronised Powerwidth Modulation; Space Vector; Electrical Motors Induction; Overmodulation; Switching Sequences; Harmonic Distortion; Stator Flux Ripple; PWM Strategies; Voltage-frequency Converters; Harmonic analysis; Real time PWM; Electric Inverters; Synchorised PWM; PWM Waveform; Pulsewidth Modulated Inverter; Per-phase Approach

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APA (6^{th} Edition):

Narayanan, G. (1999). Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/139

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^{th} Edition):

Narayanan, G. “Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives.” 1999. Thesis, Indian Institute of Science. Accessed October 18, 2019. http://hdl.handle.net/2005/139.

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^{th} Edition):

Narayanan, G. “Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives.” 1999. Web. 18 Oct 2019.

Vancouver:

Narayanan G. Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives. [Internet] [Thesis]. Indian Institute of Science; 1999. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/2005/139.

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Narayanan G. Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives. [Thesis]. Indian Institute of Science; 1999. Available from: http://hdl.handle.net/2005/139

Not specified: Masters Thesis or Doctoral Dissertation