Dear sir,
So many MPPT techniques are their, what is the role of different MPPTs used in PV Interconnected to grid, if we adopt different MPPTs algorithms what variations we can observe in simulation results, is Pv panel output power change or if any. under different temperatures and irradiation conditions this mppt algorithms give what improvements in results.
Please give me reply and suggest any reference papers
Thank you.
i hope the following paper will clear your doubt
B. Subudhi and R. Pradhan, "A Comparative Study on Maximum Power Point Tracking Techniques for Photovoltaic Power Systems," in IEEE Transactions on Sustainable Energy, vol. 4, no. 1, pp. 89-98, Jan. 2013. ,
In a typical solar panel, the open circuit voltage may be, say 37 volts. When current is drawn, the voltage decreases becoming almost zero when the output terminals are shorted. Power is voltage x current. Therefore, there must be a certain voltage for which the power is maximum. This is the maximum power point.
In typical systems, it is the task of a DC to DC converter to operate
the PV panel at the optimum voltage for maximum power. This function is
called Maximum Power Point Tracking (MPPT) and the necessary DC to
DC converter is often incorporated in the inverter box. There are single-
chip controllers for MPPT. For example, Texas Instruments SM72442 is a
programmable single chip MPPT controller providing driving signals for a
4-switch buck-boost converter.
The adoption of PV systems in the Maldives: A technological review. Available from: https://www.researchgate.net/publication/297940113_The_adoption_of_PV_systems_in_the_Maldives_A_technological_review [accessed Aug 16 2018].
MPPT or Maximum Power Point Tracking is algorithm that included in charge controllers used for extracting maximum available power from PV module under certain conditions. The voltage at which PV module can produce maximum power is called ‘maximum power point’ (or peak power voltage). Maximum power varies with solar radiation, ambient temperature and solar cell temperature.
Adding to the colleagues:
In the grid connected PV generator, there is a DC/DC converter connected to the generator to operate the PV at its maximum power point irrespective of its irradiation and temperature changes. The DC/DC converter gives almost DC voltage serving as a DC input BUS for the DC/AC inverter. The inverter itself is connected to the grid where its output current is controlled by the inverter controller while its voltage is the same as the grid voltage after its LC filtration. All maximum power point tracking algorithms matches the output from the PV to the its output for maximum power control.
For more information please follow the paper in the link:Article Enhancing the maximum power point tracking techniques for ph...
Best wishes
thank you sir, but my question is in pv grid connected system is it necessary to use DC-DC converter rather than a voltage controller implemented in PV inverter control technique ?
dear sir, Bandi Mallikarjuna Reddy
you meen with MPPT we can improve PV output power at different environmental conditions, but when i comparing P&O and INCREMENTAL bout cases output power is same , than what is the resan ?
MPPT will always give reference output voltage only to inverter controller block right or Duty cycle to dc -dc converter.
did you observe it, at this condition only i have a doubt.
The "role" of any MPPT strategy is to extract as much power as possible from the PV frontend.
The better "classical" MPPT algorithms actively try to "really" track the maximum power point. They may differ in their response to variations in the"environmental conditions" (mainly illumination level, temperature and eventuall partial shading), but won't differ too much if implemented flawlessly.
What I denominated above as "classical" MPPT are algorithms that can get stuck to a local power maximum - not detecting the "global" MPP. Such a condition with multiple local MPPs may arise from partial shading. And beyond the most simple techniques (e.g. the "fractional VOC" approach), all classical MPPT algoriths are expected to deliver about the same result.
Current developments try different approaches to be superior in finding the global MPP. But whatever algorithm is applied, basically these approaches apply a set of multiple individual MPPTs - deciding upon which MPP to follow after the evaluation of all individual MPPs.
The downside of this approach is simple (but often neglected in simulations):
the acquisition of each individual MPPT operating point requires time during which the maximum power available is not drawn. Having more of these trackers sill result in longer times not operating at the MPP. The interesting thing is to find a good balance between the advantages of eventually being able to locate the global MPP and the losses during the evaluation of each tracker's current operating point.
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