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<p>In comparison to FB-SM MMC, hybrid MMC, which incorporates both HB and FB SMs, efficiently mitigates the DC fault management with fewer devices. Conventional voltage balancing involves continuous switching of semiconductor devices, which contributes to increased switching losses. This article proposes a closed-loop SM capacitor voltage balancing technique through optimized FB-SM utilization, minimizing the switching transitions &amp; thereby switching losses significantly. The article also introduces a simplified method for promptly determining FB-SM status and a technique for the elimination of unwanted SM switching. The power loss analysis has been carried out further to demonstrate a reduction in switching transitions with the proposed closed-loop technique, thereby reducing switching losses of the converter. The proposed SM capacitor voltage balancing algorithm is validated on 3-<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\phi \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ϕ</mi> </math></EquationSource> </InlineEquation>, 1.5MVA, 8kV reducing the switching losses by 79.64%. The same is validated in experimental verification with 1-<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\phi \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ϕ</mi> </math></EquationSource> </InlineEquation>, 700VA, 300V, where the result indicates a 75% reduction in switching losses compared to traditional voltage balancing. Furthermore, the article analyses the DC pole-to-pole short circuit fault blocking capability of the Hybrid MMC. The simulation &amp; hardware results validate the proposed techniques.</p>

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Closed-loop voltage balancing technique to reduce switching transitions & DC fault handling in hybrid mmc with optimized utilization of FB-SMs

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Akshaya D. Bonde,
  • Pradyumn Chaturvedi,
  • Vijay B. Borghate

摘要

In comparison to FB-SM MMC, hybrid MMC, which incorporates both HB and FB SMs, efficiently mitigates the DC fault management with fewer devices. Conventional voltage balancing involves continuous switching of semiconductor devices, which contributes to increased switching losses. This article proposes a closed-loop SM capacitor voltage balancing technique through optimized FB-SM utilization, minimizing the switching transitions & thereby switching losses significantly. The article also introduces a simplified method for promptly determining FB-SM status and a technique for the elimination of unwanted SM switching. The power loss analysis has been carried out further to demonstrate a reduction in switching transitions with the proposed closed-loop technique, thereby reducing switching losses of the converter. The proposed SM capacitor voltage balancing algorithm is validated on 3- \(\phi \) ϕ , 1.5MVA, 8kV reducing the switching losses by 79.64%. The same is validated in experimental verification with 1- \(\phi \) ϕ , 700VA, 300V, where the result indicates a 75% reduction in switching losses compared to traditional voltage balancing. Furthermore, the article analyses the DC pole-to-pole short circuit fault blocking capability of the Hybrid MMC. The simulation & hardware results validate the proposed techniques.