I have modelled a 50 KW PV system(in MATLAB) using which I want to feed grid in which no load has been connected.For the initial few seconds in simulation the power of PV remains 50KW but drops later to 0 and remains constant at this value.When I run the PV model in isolation 50KW remains maintained.What could be the possible reason for it?
Secondly my inverter o/p waveform for the initial few seconds deviates from the characteristics required but when PV power becomes zero desired phase voltage characteristics are obtained.what could be the possible reason for it?
Observe the PV characteristics of your PV. Note the MPPT. In my opinion the voltage is such that Power is zero. "This is not surprising and not a wrong statement". The PV curve is like an inverted parabola so there is a potential where power is zero.( this is a voltage other than zero itself). More so your inverter input maybe at this potential causing the power to be zero. I would recommend using a dc-dc converter between PV and inverter. The duty cycle ratio should be inverter input voltage:PV voltage. Of your MPPT is lets say 40V, use a boost converter (for example) to give 80v then a inverter followed by a step up transformer. Voltage regulation is also desirable, follow the MATLAB vid on PV-grid integration, by carlos.
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