Title page for ETD etd-2798-1216

Type of Document

Master's Thesis

Author

Prasad, V. H.

Author's Email Address

prasadvh@vpec.vt.edu

URN

etd-2798-1216

Title

Analysis and Comparison of Space Vector Modulation schemes for Three-Leg and Four-Leg Voltage Source inverters

Degree

Master of Science

Department

Electrical Engineering

Advisory Committee

Advisor Name	Title
Borojevich, Dushan	Committee Chair
Chen, Dan Y.	Committee Member
Lee, Fred C.	Committee Member

Keywords

space vector modulation
inverters

Date of Defense

1997-05-15

Availability

unrestricted

Abstract

ANALYSIS AND COMPARISON OF SPACE VECTOR

MODULATIONSCHEMES FOR THREE-LEG AND FOUR-LEG

VOLTAGE SOURCE INVERTERS

by

V.Himamshu Prasad

Dusan Borojevic, Chairman

Electrical Engineering

(ABSTRACT)

Several space vector modulation schemes have been analyzed for three-leg and four-leg

voltage source inverters. The analysis is performed with respect to a) switching losses, b)

total harmonic distortion, c) peak-to-peak ripple in the line current and d) the ease of

digital implementation. The analysis is performed over the entire range of modulation

index and for varying load power factors (leading and lagging) under both balanced and

unbalanced load conditions. The analysis shows that the performance of four-leg inverters

is similar to three-leg inverters for various space vector modulation schemes. The analysis

also verifies the fact that a modulation scheme with good harmonic performance usually

has high switching losses and vice-versa. The analysis is verified using simulation and

experiments. A novel algorithm for the calculation of total harmonic distortion of PWM

signals has been proposed.

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