hello,
please i need a clear answer about this topic because i am really confused !
i know that the MPPT algorithm have the chance to get the Maximum power when the weather (irradiance and/ or the temperature) change. but what about the behavior of MPPT when the load changes ? shall we also expect the maximum power corresponding to a certain temp and irradiance even if the load changes ?
for example if the MPPT is well working with the irr and temp variations, does the load variation affects the power provided by the PV panel ? or we can say the if we have an MPPT alg so that always we will expect the Mpp whatever the load is..??
The MPPT is affected by the variation of solar radiation intensity and temperature in the case of a PV system, because the tracking algorithm is based on the power parameters of the PV generator and not on the load.
I have studied the MPPT tracker for a Pv system with a dynamic (variable ) load, and I noticed that the variation of the load does not influence the maximum power point
Best regard
thank you for replying!
yes, that what exactly I meant, logically the MPPT is related to the variation of the weather and it shouldn't be affected by the load if it is acting normally!
so if a certaintemp and irradiance can give us a certain maximum, using MPPT we will always have this same value of maximum whatever the load is..
That is a mathematical not an actual behavior. For an isolated dc load to consume the maximum power, it has to have a resistance equals the characteristic resistance of the arry. Otherwise, the load flow operating point cannot be at the maximum power.
For the MPPT to be really useful, grid connection should be available. In this case, if the local load is less than the MPP, then the inverter injects the surplus power to the grid.
Mohamed EL-Shimy Nasreddine Attou thank you, sirs
yes for sure, actually my system is a microgrid so the PV panel is connected to a battery and if there any surplus or deficiency in energy, this will be supported by the storage system.
but am asking my question because my MPPT was working well with the variation of the irradiance and temperature but when I vary the load during the simulation, i noticed that the current provided by the PV panel is affected by the variation of the load and it is no longer controlled by the MPPT.
logically, if this is this happening so there is something wrong in my system right ?
I encountered this error in the simulation of a micro grid.
When I used the block (dynamic load) to simulate a time-varying load, the MPPT control was influenced by the load variation.
As a solution, I initialized the model in the powergui block (machine initialization) and set the simulation parameters and everything is fine.
The MPPT varies the ratio between the voltage and current delivered to the battery, in order to deliver maximum power. If there is excess voltage available from the PV, then it converts that to additional current to the battery but it doesn’t impact to the Maximum power point.
Nasreddine Attou
actually, I am working on a DC microgrid and the load is also DC load and am presenting this load as a controlled current source. so in this case, I can not solve it using machine initialization, so have you any idea how can we try to get rid of this affection?
Sarah Kassir
The solution I propose to you is to use an external VDC voltage regulation loop using the PI regulator (adjust well the controller parameters) to obtain the desired maximum power.
Kind regard
We are agree that the power generation of PV panels depends on the intensity of solar irradiation and temperature 🌡️ level as well.
Here, each solar input affects a PV output, voltage exposed to temperature and current exposed to irradiation changes.
But, considering the type of the used DC DC converter, here the impedance seen by the PV terminals has a relation with the impedance of the connected load, so the change if this last can change the pv operating point.
Besides, the buck-boost converter outperforms the buck and boost converters owing to its capability to track the MPPs at wide range of load change, so the buck and the boost can only track the MPPs at the half of the same range.
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