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3 months ago in Power Electronics By Veena

How do you choose the optimal dc bus voltage for a vsc?

I'm designing a voltage source converter. How do I pick the DC bus voltage—is higher always better?

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By Akash Answered 1 month ago

No, it's a balance. V_dc must be high enough to produce the required AC output (V_dc ≥ √2 × V_LL for SVM). Operating near a modulation index of 1 is efficient. But higher V_dc means higher device voltage ratings (more expensive, more losses), higher switching losses, and stricter insulation requirements. The optimum is the minimum voltage that reliably meets your AC output and control margin, staying within device limits. Higher isn't better. Enough is perfect.

 

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