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Renewable Energy Development Kit

Bosko Karadza
Prodigy 155 points


 

What effect does increasing DC bus voltage have on the inverter's AC output  with Buck/Boost control selected OFF?  I would like to simply track a DC bus voltage setpoint and allow Inverter PWM duty to regulate the DC Bus voltage.  Preference is not to utilize the buck/boost stages, as all I want to do is regen power to the AC grid when the DC bus setpoint is exceeded.

Also, can the inverter output be connected to the AC line with an appropriate step-up isolation transformer?  I assume yes, as long as zero-cross detection is active, and current limitations are in place.

I would greatly appreciate any recommendation on changes to accomplish this.

Best regards,

Bosko 

  • 0
    Genius 5170 points

    Unless you monitor DC bus voltage to regulate your AC output with increasing DC bus voltage your AC output will also increase. If you regulate PWM based on DC bus voltage level then AC output will stay at your set point - of course there will be a high and low limit.

    Yes, with an isolation transformer you will certainly be able to connect to the AC line . However, you will need an output filter for the inverter and also you will need to track your phase angle ( a PLL will be nicer than a simple zero crossing detector). As you said you will need to control the current when the DC bus voltage goes up to a level high enough for regeneration.

    Any active front-end rectifier in a motor dirve has a similar setup .. it draws current during motoring by rectification and regenerates during generator mode by dumping energy back to the line.

    C2000 software library has more or less all the basic blocks to implement a system like this ... however in a "product" you will need a robust PLL, current protection, DC bus voltage protection, line drop-out detection etc to make your system immune to noise, faults etc.

  • 0 in reply to Arefeen
    Prodigy 155 points

    Are you aware of any additional inverter code resources or other variations of the published renewable energy kit?

    Your response is greatly appreciated, thank you for your time.

    Bosko

     

  • 0 in reply to Bosko Karadza
    Genius 5170 points

    Sorry, I am not aware of any other version of this kit or the code .. I am sure TI team will clarify if additional material is available from any other source.