The DC-link capacitor is a crucial component in two-level three-phase voltage source inverters (VSIs) to provide a low impedance path for the high-frequency input current and to stabilize the fluctuating DC-link voltage. When selecting the DC-link capacitor, not only the rated voltage and current but also the capacitance should be carefully considered. Ideally, the larger the capacitance of DC-link capacitor, the better for the DC-link voltage stabilization. However, in practice, there is a limitation to infinitely increasing the capacitance because of cost, volume, and size problems. Thus, the DC-link voltage ripple should be analyzed to help in precisely selecting the appropriate capacitance of DC-link capacitor, especially when using film capacitors. In general, the DC-link voltage ripple depends on the pulse-width modulation (PWM) strategies. This paper presents the DC-link voltage ripple analysis, particularly when the generalized discontinuous PWM (GDPWM) strategy, which is optimal for minimizing the switching losses under all operating conditions of VSI, is applied. Moreover, an equation is proposed to help selecting the minimum capacitance of DC-link capacitor. Simulation and experimental results with a motor drive system are also provided to verify the effectiveness of the presented analysis.
|Title of host publication||2022 IEEE Transportation Electrification Conference and Expo, ITEC 2022|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|Publication status||Published - 2022|
|Event||2022 IEEE Transportation Electrification Conference and Expo, ITEC 2022 - Anaheim, United States|
Duration: 2022 Jun 15 → 2022 Jun 17
|Name||2022 IEEE Transportation Electrification Conference and Expo, ITEC 2022|
|Conference||2022 IEEE Transportation Electrification Conference and Expo, ITEC 2022|
|Period||22/6/15 → 22/6/17|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (MSIT), Korea government (NO. 2020R1A3B2079407).
© 2022 IEEE.
All Science Journal Classification (ASJC) codes
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Mechanical Engineering