• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 83 subscribers
  • Views 331 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CCS/TMDSSOLARUINVKIT: Running TMDSSOLARUINVKIT without GRID

Manish Prajapati
Prodigy 20 points

Part Number: TMDSSOLARUINVKIT

Tool/software: Code Composer Studio

Is it possible to operate TMDSSOLARUINVKIT without connecting the GRID. Specifically, I am trying to run the kit in following configuration:

#define INCR_BUILD 3
#define GRID_CONNECT 0
#define MPPT 1

However, it doesn't seem to work. I have connected appropriate load at the AC side and for DC supply I am using AMETEK PV simulator. I am able to operate the kit in GRID connect mode. But for configuration without the grid, "PVInverterState" goes till "DCBusMonitor" state and then back to "Idle". At this stage, there is overvoltage at the DC input side and the PV simulator stops. (Overvoltage at the DC input side occurs every time I turn off the inverter, even during GRID connect mode). So, I am not sure how to operate the kit without the grid. Any help would be greatly appreciated. Thanks.

  • 0
    TI__Genius 11815 points
    You should not use the PV simulator when there is no grid. Because without grid connection PV simulator will pump enough current and may cause high voltage (inverter output or DC bus voltage). Without the grid, you will use load resistor (inverter output) and DC source input and select the appropriate software build. This is detailed in the User Guide.

    Shamim
  • 0 in reply to Shamim Choudhury
    Prodigy 20 points

    Thanks for the reply.


    With your suggestion, I tried with DC source input (instead of PV simulator) and load resistor (100-200ohm) at the inverter output side. However, the problem still remains. The user guide has explained procedures only for Build 2 (individual testing of Flyback / Inverter) for Grid disconnected mode. For Build 3, there are procedures only for Grid Connect mode.


    My settings are as following:

    #define INCR_BUILD 3
    #define GRID_CONNECT 0
    #define MPPT 0

    The problem seems that the DC Bus voltage exceeds 400V and the inverter trips. I tried to put loads at the DC bus in order to control the voltage (300-400V). However, the inverter does not initiate.

  • 0 in reply to Manish Prajapati
    TI__Mastermind 43730 points

    Manish,

    As you mentioned, you are trying to run the design in a mode that we did not implement/ test for, hence only thing we can offer is suggestion for things to check.

    Have a look at the state machine for grid connected mode, understand how the different power stages are turned on to make sure the bus voltage does not exceed the limit,

    Once you understand this you can make modification for the mode you are trying to run. You may also want to increase the pv input reference current command initially in the state machine if the dC BUS voltage does not reach the 380V ..