Title :
Operation of a voltage source converter at increased utility voltage
Author :
Kaura, Vikram ; Blasko, Vladimir
Author_Institution :
Standard Drives Div., Rockwell Automation-Allen Bradley Company, Mequon, WI, USA
fDate :
1/1/1997 12:00:00 AM
Abstract :
The operation of a voltage source converter (VSC) with regeneration capability, controllable power factor, and low distortion of utility currents is analyzed at increased utility voltage. Increase in the utility voltage causes a VSC to saturate and enter a nonlinear mode of operation. To operate under elevated utility, two steps are taken: (1) a pulse width modulation (PWM) algorithm is implemented which extends the linear region of operation by 15%, and (2) a PWM saturation regulator is used to control the reactive current at higher utility voltages. The PWM algorithm reduces the switching losses by at least 33% and the effect of blanking time by one-third. All analytical results are experimentally verified on a 100 kW three-phase VSC
Keywords :
PWM power convertors; electric current control; harmonic distortion; losses; power factor correction; switching circuits; 100 kW; PWM algorithm; PWM saturation regulator; controllable power factor; increased utility voltage; low utility currents distortion; pulse width modulation; reactive current control; regeneration capability; switching losses reduction; utility voltage increase; voltage source converter; Blanking; Converters; Nonlinear distortion; Power conversion; Pulse width modulation; Reactive power; Regulators; Space vector pulse width modulation; Switching loss; Voltage control;
Journal_Title :
Power Electronics, IEEE Transactions on
