AJOU Central Library Repository: Discontinuous PWM Method with Reduced DC-link Ripple Current in Back-to-back Converters

Graduate School of Ajou University Department of Electronic Engineering 3. Theses(Master)

Discontinuous PWM Method with Reduced DC-link Ripple Current in Back-to-back Converters

Alternative Abstract: This paper introduces a novel discontinuous pulse width modulation (DPWM) method to minimize the dc-link ripple current in back-to-back converters. DPWM is used in power converters to curtail the stress on the switching devices, therefore, extending the lifespan. However, as the conventional DPWM is used in a back-to-back topology, the ripple current of the dc-link severely increases during the regions when the power switches are clamped to the dc-bus. Furthermore, the dc-link ripple current reaches the amplitude value when the power switches of both converters are clamped to different dc-link buses. As a result, the life-span of the dc-link capacitor decreases as it endures more stress. To surmount this issue, the reference voltages should be obtained considering the intervals with the increased ripple current of the dc-link. It is achieved by adjusting the zero-sequence component to match the clamping states of both inverters. The efficacy and performance of the proposed method are demonstrated via the PSIM simulation and the experimental results.

Appears in Collections:: Graduate School of Ajou University > Department of Electronic Engineering > 3. Theses(Master)

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