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In stand-alone brushless doubly fed generator (BDFG) based shaft power generation system, the output voltage of BDFG is strong influenced by the filter of load side converter (LSC) because of the coupling caused by the stator power winding leakage inductance. In order to eliminate the harmonic of the voltage, the LC-L filter based on the leakage inductance is put forward in this paper. The relationship...
An analysis method of circulating current in parallel SPWM inverter system for AC motor drive is proposed based on double Fourier Transform theory in this paper. The models of driving current and circulating current are constructed by voltage equations of inverters and motor load. The characteristic of circulating current is analyzed by using the modulating equations under the condition that the triangular...
The matrix converter is a single-stage ac–ac power conversion device without dc-link energy storage elements. Any disturbance in the input voltages will be immediately reflected to the output voltages. In this paper, a modified space vector modulation strategy for matrix converter has been presented under the abnormal input-voltage conditions, in terms of unbalance, nonsinusoid, and surge (sudden...
Due to lack of dc-link energy storage elements in the matrix converter, any disturbance in the input voltages will be immediately reflected to the output voltages. In order to guarantee safe and stable operation of matrix converters under abnormal input voltage conditions, the paper proposes an improved method to real-time calculate voltage modulation ratio using the space vector magnitude of output...
A series-resonant single-phase series-resonant AC chopper is presented. The presented single-phase AC chopper is configured by a series-resonant conversion without cycloconversion and auxiliary switches. The presented single-phase AC chopper is a series resonator with four main switches to configure adaptively the resonant voltage robes. The synthesized sinusoidal waveform (SSW) before output filter...
This paper proposes a current-balancing technique to equalize the driving currents for multiple cold-cathode fluorescent lamps (CCFLs) by modulating the fundamental components and harmonics in each lamp currents. First, we adopt a class D resonant inverter as the main circuit. Next, we introduce an averaging circuit incorporating the PWM control to form a new current-sharing controller, where the...
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