Title :
A new method of PWM control for forced commutated cycloconverters using microprocessors
Author :
Ishiguro, Akio ; Inagaki, Katsuhisa ; Ishida, Muneaki ; Okuma, Shigeru ; Uchikawa, Yoshiki ; Iwata, Koji
Author_Institution :
Dept. of Electron. Mech. Eng., Nagoya Univ., Japan
Abstract :
A real-time method for generating PWM (pulsewidth modulation) patterns is proposed. The method realizes sinusoidal input and output currents, controllable input displacement factor regardless of load power factor, and maximum output voltage range. The method is effective for reducing higher and fractional harmonic components in the output voltages and the input currents, since it uses three phases of the input voltage sources, which can be connected to the output at the same time. The higher harmonic oscillation in the input filters is reduced by changing the switching sequence of the PWM patterns adequately, and the distortion of the input current is improved. An output current feedback control based on the proposed switching pattern realizes an exact and quick response of the output current. The feasibility of the method is confirmed by simulation and experiments.<>
Keywords :
commutation; cycloconvertors; electric current control; harmonics; microcomputer applications; pulse width modulation; PWM control; PWM patterns generation; forced commutated cycloconverters; fractional harmonic components; higher harmonic oscillation; load power factor; microprocessors; output current feedback control; real-time method; switching; Displacement control; Feedback control; Force control; Harmonic distortion; Power harmonic filters; Pulse generation; Pulse width modulation; Reactive power; Space vector pulse width modulation; Voltage control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE
Conference_Location :
Pittsburgh, PA, USA
DOI :
10.1109/IAS.1988.25141
