| Summary: | <p>Three-phase voltage source inverters are increasingly employed in power systems
and industrial applications. Various pulse width modulation strategies have been applied
to control the voltage source inverters. This dissertation presents a hybrid 2D-3D space
vector modulation algorithm for three-phase voltage source inverters with both three-wire
and four-wire topologies. The voltage magnitude and phase angle of the inverters
fundamental output phase voltage are precisely controlled under either balanced or
unbalanced load conditions, and hence, the space vector algorithm offers synchronization
controllability over generation control in distributed generation systems. The numerical
efficiency and simplicity of the proposed algorithm are validated through conducting
MATLAB/Simulink simulations and hardware experiments.</p>
<p>Mathematical description and harmonic analyses of output phase voltages of
three-phase voltage source inverter which employs a hybrid 2D-3D SVM are presented in
this dissertation. Explicit time domain representation of the harmonic components in
addition to the total harmonic distortion of the output phase voltages are given in terms of
system and switching parameters. The dissertation also investigates the harmonic
characteristics and low total harmonic distortion performance against the linearity of
modulation region which helps in the harmonic performance and design studies of such
inverters employing the hybrid 2D-3D SVM. Experimental results are used to validate
these analyses.</p>
<p>In addition, the performance and the harmonic contents of the inverter output
phase voltage when applying the proposed hybrid 2D-3D SVM are compared to that
obtained from conventional 2D SVM and 3D SVM. As a result, the proposed new
algorithm shows advantages in terms of low total harmonic distortion and reduced
harmonic contents in both three-wire and four-wire systems.</p>
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