Thesis Anatolii Tcai, “Discontinuous PWM Method with Reduced DC-link Ripple Current in Back-to-back Converters,” 아주대학교 공학석사 학위 논문, 2018.
2018
본문
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.
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