Running Inverter and boost converter together

Soinds like your inverter works with a separate supply ... the next thing is to check the opetaion of your DC/DC converter... does it work independently? After verifying the operation of inverter and DC/DC conververter independently your work will be in integration. I believe TI already has an example  system where front-end PFC is integrated with three phase motor control system . Front-end PFC in many cases is nothing but a DC/DC boost converter. I suggest you check out that system for a better understanding on integration. Good luck.

It sounds like a timing + tuning issue. 

first make sure your boost stage is stabilized before your inverter starts. And the load not to be slammed right away but slowly ramped up to start with.

when you tested your boost stage separately, did you put any load on it? did you notice any dynamics? When you say "inverter does not work" did you mean the dc bus remains but the inverter does not have correct output? or more likely, the dc bus went to unstable or over voltage/under voltage shut down? do you have a closed loop on the inverter? can you use open loop on the inverter first without any load? I would focus on the boost stage since a boost is by nature harder to stabilize. 

btw, i suppose you took care of the pre-charge of the bus... 

Hi Meral

First of all, congratulations for get your board working!.

I´m trying to control the same kit (Renewable energy kit), but with DSP28035. I can´t find information enought to work with Simulink

My problem becames when I try to control the DC Boost. If I put a PWM in e_PMW4A with a duty of 1/4, I obtain a V out too hight. I mean, if V in is 10V with that duty Vout goes into 54V. I can´t find the reason of that behabiour, and i´d like to ask you for help. 

Here, you can see what i did, and could you tell me if should I do anything else?

Thanks in advance

Hi Meral. I am one of the team members of the Senior Design Team at Iowa State University, and we are trying to run a Boost Converter on our TMS320F28335 kit, however we are facing some issues with obtaining the desired output voltage. It would be very helpful if you could provide us with some information or figures on how you went about getting it to work? Any kind of detail would be helpful.

Hi ,

I suggest you to check your DC-DC boost converter for independent operation. If it works satisfactorily then u can try to integrate it. I have already worked on eZdsp for providing pulses to a three phase inverter powered by pv source and i was able to integrate it successfully. Try to work with a fixed DC source until you find a solution, check for the software part.

Good luck..

Is the ground between two stages common. How do u drive the next state, with opto isolation, pulse t/f isolation or just directly. I am working on a similar design with AC to DC stage followed by DC to AC stage. It does voltage stabilization and frequency conversion, but have used quite a bit of protection and isolation.

Hi,

    We have a common ground, our boost for some reason when connected with our inverter gives bad results, iis it because of the dc bus capacitor.

Thanks. 

Can u plz give me link to the schematics on it web site. It could be a drive problem but i can only comment if I have the ckt diagram.

 Hi,

 The Schematic Is Under Developers ToolS In Control Suite. You Can Find It Under High Voltage Motor Control Pfc Kit V1.7. Thanks