MMC Power Device Loss and Junction Temperature Calculation Considering Junction Temperature Feedback

Zheng, Renwen; Wang, Youyuan; Qian, Weirong; Liu, Li; Yu, Enke

doi:10.1109/ichve53725.2022.10014519

Cited by 1 publication

(1 citation statement)

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“…Therefore, another commonly used method for calculating switching losses in [31][32][33] is selected for comparison. The common method is to calculate the average switching frequency f sw,avg of power devices and the switching energy E sw,eff corresponding to the effective value of the equivalent currents flowing through the power devices respectively during a power cycle, and multiply them to obtain the switching losses of MMC power devices, as:…”

Section: Analysis Of Loss Calculation Accuracymentioning

confidence: 99%

Loss distribution analysis and accurate calculation method for bulk-power MMC

Song,

Luo,

Xiong

2023

Prot Control Mod Power Syst

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Accurate evaluation of power losses in a modular multilevel converter (MMC) is very important for circuit component selection, cooling system design, and reliability analysis of power transmission systems. However, the existing converter valve loss calculation methods using the nearest level modulation (NLM) method and the traditional sorting-based capacitor voltage balancing strategy are inaccurate since the submodule (SM) switching logics in the MMC arms are uncertain. To solve this problem, the switching principle of the SMs in the sorting-based voltage balancing strategy is analyzed. An accurate MMC power loss calculation method based on the analysis of loss distribution of various SM topologies, including half-bridge submodule (HBSM), full-bridge submodule (FBSM) and clamp double submodule (CDSM), is proposed in this paper. The method can accurately calculate the losses caused by the extra switching actions during the capacitor voltage balancing process, thus greatly increasing the calculation accuracy of switching losses compared with existing methods. Simulation results based on a practical ± 350 kV/1000 MW MMC-HVDC system with variety of MMC topologies with different voltage balancing strategies demonstrate the effectiveness of the proposed method.

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Section: Analysis Of Loss Calculation Accuracymentioning

confidence: 99%