Dear Divya

It depends on the class of multilevel inverter you deal with? The diode-clamped, multilevel, voltage-sourced converter DCC is a generalization

of these inverters. One main technical requirement for proper operation of an n-level DCC is to maintain the voltages of its DC-bus capacitors at their prescribed (usually equal) levels and to prevent voltage drifts during the steady-state and dynamic regimes.

In a DCC, net DC-bus voltage regulation cannot guarantee proper operation of the

converter system since the individual capacitor voltages may drift or even entirely

collapse. This is in contrast to the case of the three-wire two-level VSC for which net DC voltage regulation guarantees proper operation. The provision of a DC-side voltage equalizing scheme is essential for the operation of the DCC.

Conceptually, there are two approaches to deal with the DC capacitor voltage drift

phenomenon in a DCC. The first approach is to utilize an auxiliary power circuitry.

The auxiliary circuitry can be a set of independent power supplies for capacitors,

or it can be a dedicated electronic converter—of a considerably smaller capacity—

that injects current into the capacitors and regulates their voltages. The approach is, however, not appealing for power systems applications due to its cost and complexity.

The second approach to equalize the voltages of the DC-side capacitors of a

DCC is to enhance the converter control strategy, to modify the switching patterns

of the switches such that the capacitors’ voltages are regulated at their corresponding desired values. Although this approach calls for a more elaborate control strategy, it offers an economically viable and technically elegant solution to the problem.

Hope this helps!

Hi Walid,

You are right about the dependency about the class of Multilevel inverter. But, I need just switching pulses for every switch so that I can trigger my 5 switches in a manner that I can generate the output Voltage.

BTW thank you for time and help.

See, please, the attached table-file. best wishes