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A decoupled parallel control of PWM inverters for AC motor drives is proposed in this paper. The control for sinusoidal reference synchronization, with variable frequency, and the control for load current sharing are decoupled by a local feedback. At first, the phase angle of the sinusoidal reference of each inverter is represented as a square signal and shared among the inverters. And the phase angle...
A three-phase PWM bidirectional converter system based on line voltage oriented vector control is researched. A novel on line voltage oriented vector control without line voltage sensing is proposed. The system is operated with unit power factor in the side of AC line no matter in rectifier mode or active inverter mode. The alpha and beta components of line voltage were estimated by the line current,...
Although repetitive controlled PWM inverters present an excellent steady-state performance, they cannot present a good dynamic performance under non-periodic disturbances. To resolve this problem, this paper analyzes the error characteristic of pulse width modulation (PWM) inverter system controlled by repetitive controller and voltage-current dual-loop controller, pointes out the necessary condition...
Although repetitive controlled PWM inverters present an excellent steady-state performance, they cannot present a good dynamic performance under non-periodic disturbances. To resolve this problem, this paper analyzes the error characteristic of pulse width modulation (PWM) inverter system controlled by repetitive controller and voltage-current dual-loop controller, pointes out the necessary condition...
Inner current loop modeling of a resonant DC link inverter, soft switching combination inverter, which works in current controlled three state discrete pulse modulation mode, is proposed. The modeling method is valid for double loop feedback controlled inverters which works in other modulation mode. Equivalent analytic model is established and used for voltage regulator design. Example are given in...
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