Some inverters will trip or issue an overvoltage fault if the DC bus exceeds a threshold (e.g., 800 V on a 400 V-class inverter). In multi-inverter systems sharing a DC bus, regeneration from one unit can affect others. Solar or battery-connected inverters may have intentionally higher DC bus voltages for MPPT or efficiency reasons.
The formula is VLL (rms) = m*Vdc/2*sqrt (3)/sqrt (2)= m*Vdc*0.6124, here m is the modulation index. I am assuming you are trying to get the DC bus voltage for a grid-tied inverter. The answer to this depends on the type of converter used. The most common one will be voltage source converter, which I will based on answer on.
For single-phase system, the maximum line-to-line voltage needs to be generated by the inverter is simply the grid''s line-to neutral voltage. So, for a 240V sistem, the minimum Vdc will be 240*sqrt (2) = 340 V. Normally we select the dc bus voltage value based on the type of converter used as already explained by Hangseng Che.
As a result, the machine drive system efficiency can be improved with lower dc bus voltage since the switching losses in the inverter are reduced. To achieve both desired machine output torque and minimized losses simultaneously, an optimum dc bus voltage is required.
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According to the traditional voltage and current double closed-loop control mode, the inverter management strategy for photovoltaic grid connection has insufficient anti-interference ability and slow response. …
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Free QuoteEnter the DC bus voltage (volts) and the difference in modulation indices into the calculator to determine the Inverter Voltage.
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Free QuoteFor single-phase system, the maximum line-to-line voltage needs to be generated by the inverter is simply the grid''s line-to neutral voltage.
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