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- Title
Analysis and suppression of switching‐frequency harmonics in variable‐output‐voltage inverters.
- Authors
Farhadi‐Kangarlu, Mohammad; Khiavi, Abdolhamid Moallemi; Neyshabouri, Yousef
- Abstract
Summary: In many practical applications such as motor drives, the inverter is required to produce a variable output voltage within a wide range (e.g., 0.1 to 1 pu). In such cases, when the inverter operates in low modulation index (low output voltage), the harmonic distortion of the output voltage increases due to considerable reduction in the magnitude of the fundamental component. Also, the ratio of the switching losses to the output power will be high in the low modulation index. In this paper, a simple solution is proposed to overcome the problems. The principle of the proposed solution is to adjust the DC‐link voltage so that the modulation index of the inverter remains within a specific high range. Different practical ways of obtaining controlled DC‐link voltage are presented. Also, for operation of the DC‐DC converter used for DC‐link voltage control, three strategies are proposed. The proposed solution is simple, and it is very effective and feasible to implement. To the best of the authors' knowledge, the idea has not been presented in this form previously. In order to verify the proposed solution, the simulation and experimental results are presented and discussed.
- Subjects
DC-to-DC converters; MOTOR drives (Electric motors); VOLTAGE control; ELECTRIC inverters; VOLTAGE; LOW voltage systems; PULSE width modulation transformers
- Publication
International Journal of Circuit Theory & Applications, 2024, Vol 52, Issue 5, p2403
- ISSN
0098-9886
- Publication type
Article
- DOI
10.1002/cta.3886