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This paper introduces a novel digital approach applied to a three-phase four-wire active power filter, which is made up of a three-phase four-leg voltage source converter. The controller just detects main current and DC side capacitor voltage and duty cycle of the switches can be calculated simply. This controller has fewer measurement, higher robustness and simpler calculation as comparing to traditional...
Conducted electromagnetic interference in numerical control machine are introduced at first. PWM motor drive system is widely applied to numerical control machine tools. However, owing to power converter adopts pulse width modulation, which inevitably causes conducted common mode EMI. Common mode EMI generated by voltage source PWM inverter and the essences of its adverse effects are investigated...
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