Abstract
This paper proposes a new method to reduce the ripple current of the DC-link capacitor in a two-level voltage source inverter (VSI), with a discontinuous pulse-width modulation (DPWM). In real applications, a capacitor block is very bulky, due to the parallel connection of several capacitors that share the value of the ripple current. Hence, it contributes significantly to the volume and weight of the whole system. Conventional DPWM is used to minimize the amount of switching for the power transistors, therefore, reducing stress and power loss. This leads to increased efficiency and reliability of the system. Nevertheless, the reduction of the DC link ripple current is still not optimal. Therefore, the proposed method introduces a PWM phase-shift technique to provide further reduction of the DC-link ripple current in a DPWM-based VSI. The efficacy of the proposed method is confirmed by simulation and experimental results.
Highlights
The reliability of electronic power converters is a very important feature in industrial applications
In 2L-voltage source inverter (VSI), the voltage is maintained around a certain level and its fluctuations are relatively small, the lifetime is mainly determined by the core temperature: Tcor = Tamb + ∆ T = Tamb + Pd Rth where Ta is the ambient temperature, Rth is the case-ambient resistance of the capacitor, Pd is the power dissipation or the thermal loss, caused by the ESR of the capacitor and estimated as follows: Pd = R ESR · IRMS
This paper proposes a DC-link ripple current reduction method for a discontinuous pulse-width modulation (DPWM)-based 2L-VSI
Summary
The reliability of electronic power converters is a very important feature in industrial applications. The DC-link capacitor is a vital component in this topology as it compensates for the power difference between the input and the output It maintains the DC voltage around a necessary level. Due to the high-frequency ripple current flowing through the DC-link, the capacitor endures constant stress, resulting in a decreased life-span. Discontinuous based modulation, namely discontinuous pulse-width modulation (DPWM) Among these two types, the DPWM has higher capability of diminishing the stress on transistors and minimizing power loss. A system with reduced power loss of the switches and minimized DC-link ripple would result in increased stability and reliability. This paper proposes a PWM phase-shift method to reduce the DC-link ripple current in a single two-level VSI with the conventional carrier-based DPWM.
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