PV educator

Note : If you are using a variable step size in simulink, then add a zero order hold before each input of sim coupler and insert the sample time same as of PSIM. If you are using fixed step size in simulink then 

In this blog post i will explain how i solved a problem while simulating a partial shading issue in PSIM. I was trying to simulate a two panel scenario with one panel shaded. However, i was not getting the result. In fact the following dialog box was shown upon the completion of simulation.

Warning : ...... files contains missing or invalid points

The situation in MATLAB was the same. No curve appeared on the XY plotter and the diplay block showed NaN. The problem was solved by following the below mentioned steps.

1. Connect a small capacitor (1 microfarad ) in parallel with each PV module.
2. Do not forget to add bypass diode. 

Problem

While doing co simulation the results on simview stopped showing.

Solution:

Go to PSIM and double click on simulation control circle. You can also access the simulation control by clicking on simulate > simulation control.

Un-check the free run box.

Problem 

While simulating a grid connected PV system using co-simulation among PSIM and SIMULINK i was getting error. The error stated that

Algebraic state in algebraic loop containing 'SCMPPT_sensorless_v4_buckboost_ok/Product3' computed at time 0.0005 is Inf or NaN. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).

Problem

I encountered a strange problem while co-simulation of a PV grid connected inverter. The problem was that for simulation time less than 2 sec, the simulation results were ok. For time more than 2.5 sec the results were bad. See these figures.

Ok, so the problem is that PSim trail version does not allow you to have more than 1 input and 1 output while yuou perform a co simulation with simulink. The problem is enhaced further by the fact that only 6000 data points can be stored with the trial version. Here is the solution