Voltage Source Inverter

So otherwise are you going to get power from capacitor and How much?

You can do that, but beyond a certain point in testing, you shouldn't.

While operating off the battery, your power filter will appear to work very well, as there is nothing to filter (well, except maybe some feedback from your load). When you do real testing, you want to test with the real power source.

dear rhkramer thanks for reply

please can you give me detailed information regarding voltage source inverter with input dc source as a capacitor and battery.

thanks

Make sure to wear rubber shoes during testing, you're scaring me already.

An active filter has two major control loop:

1- Current controller to inject anti-harmonics

2-DC bus voltage controller to maintain the DC bus and prevent real power flow that would charge or discharge the capacitor bank.

Using a battery will allow you to test #1 more easily but not #2. As rhkramer wrote, you will eventually need to get off the batteries.

At this point, you will face the problems associated with tuning tightly coupled loops. This is an interesting experiment but make sure that you have rapid over voltage and over current protections because things can be wild at the beginning.

Install proper protection barriers around your test unit as exploding capacitors and IGBT can throw pieces of material. Ware safety glasses and ear plugs at a minimum.

Good luck and be safe.

PS.

You need to keep the capacitor bank in the circuit to absorb the high frequency generated by the transistor switching. The batteries are not likely to do that properly.

Regards.

Please keep in mind that a battery is considered to be an infinite capaitor and has no such drawbacks like ESR [Equivalent Series resistance] & ESL [this may be not a standard term -series inductance] so if in actual project you are using capacitors and in trial circuits you like used batteries instead you will be misguided in your design.

I had a severe experiance of it in a project where the gadet was to be used on a vehicle battery and I was testing my proto-type on a well known manufacturer's power supply of much higher rating than the reqiured power but was not getting a clue when one of my collegues advised me to test on battery instead where it will be used.

So I was successfull in my project.

Thanks to friends who advise just in time.