How to design a variable frequency drive for solar pumps

[Nitin]

Hi everyone,

I want to design a variable frequency drive (VFD) for solar water pumps. Solar PV panels provides DC voltage o/p. The job of these variable

frequency drive is to convert DC voltage to AC, & supply it to motor. The variable frequncy drive provides constant current & voltage to the

motor.

[Prabakaran P M]

You can start with designing an Inverter circuit…. And according to the input DC supply voltage you have to choose a transformer.

[nilesh]

Hi,

Buy toshiba/siemens etc VFD drive. There are some commands which work on modbus.As per vfd drive there are some changes.you need to  measure the output voltage from panel and as per output voltege send the command to VFD so it change the voltage as per solar radiation.

[R.EZHIL VALAVAN]

hai nitin,

     make your solar array string volatge to 675 v and consider the panel wattage with respect to a motor current rating and desided how many panel in series and parrallel. the easiest way for the vfd solution is to go with a delta e series inverter which is having a built in mppt algorithum. or design your own feed back using a resistive network which feeds variable power of 0 to 10 v with reference with the solar panel volatage and feed it in its speed setting port where there is a provision for external voltage or potentio meter input.

[Author]

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