Abstract:SUMMARYThis paper proposes a new method of damping harmonic resonance in the DC link of a large-capacity rectifier-inverter system, such as in rapid-transit railways. A voltage-source PWM converter is connected in series to the DC capacitor of the rectifier through a matching transformer, acting as a damping resistor to the DC capacitor current. No filters are needed to extract harmonic components from the DC capacitor current. This results in a quick response and highly stable damping. The relationship betwee… Show more
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