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Due to the parameter mismatch, the unbalanced power loss distribution among SMs in the modular multilevel converter (MMC) can be introduced and further deteriorated by the low-frequency asynchronous switching transients related to no-carrier modulation techniques. The unbalanced thermal stress can reduce the reliability of the MMC and increase the complexity of cooling system design. Nevertheless, an internal balance mechanism exists in the MMC thanks to the capacitor voltage balancing. It contributes to an even conduction loss dissipation among SMs, which is studied and revealed in this paper. Moreover, a computationally light conduction loss estimation method is proposed correspondingly relying on the characteristics of semiconductors and the arm current only. Simulations and experiments are conducted to verify the effectiveness the proposed method.
|Title of host publication||2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018|
|Number of pages||6|
|Publication date||22 Oct 2018|
|Publication status||Published - 22 Oct 2018|
|Event||8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018 - Niigata, Japan|
Duration: 20 May 2018 → 24 May 2018
|Conference||8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018|
|Period||20/05/2018 → 24/05/2018|
|Sponsor||IEEE Industry Applications Society (IAS), IEEE Power Electronics Society (PELS), IEEJ Industry Applications Society (IAS)|
- balanced conduction loss distribution
- conduction loss estimation
- Modular multilevel converter (MMC)
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- 1 Conference organisation or participation
- 9 Citations
- 1 Ph.D. thesis
Mission Profile Based Control and Reliability Improvement Strategies of Modular Multilevel ConvertersWang, Z., 2019, Aalborg Universitetsforlag. 111 p. (Ph.d.-serien for Det Ingeniør- og Naturvidenskabelige Fakultet, Aalborg Universitet).
Research output: Book/Report › Ph.D. thesis › ResearchOpen AccessFile