whenever there is a change in irradiation the PV output voltage is also changing, but for electrical loads a constant voltage is required hence we are using DC bus voltage control. my doubt is how both MPPT and DC bus voltage control is achieved with a single controller
Dear sir,i have related doubt
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.
Assume that the load at the output of the DC to DC inverter has a load RL and we want to keep its output voltage constant which means that we keep the voltage on the load constant. The input voltage changes according to the operating maximum power point where the range of change is limited because the logarithmic change of the module voltage with current.
Since the ratio between the output and the input voltage is varied by the duty ratio which can be varied in a large range then then the DC to DC controller with maximum power point tracking can keep the voltage on the load constant.
For more about the theory of the DC to DC converter with maximum power point tracking please refer to the link:https://nptel.ac.in/courses/108103009/download/M4.pdf
Best wishes
Adding to the information already given ...
The successful implementation and use of MPPT in general has an important prerequisite rarely mentioned:
- a load capable absorbing whatever power is available. (In island solutions a only partially charged battery of reasonable size usually fulfils this prerequisite. In grid-connected implementations, the grip interface poses a variable load fulfilling this requirement as well.)
Such a (basically variable) load is necessary to prevent an MPPT from either reaching the power limit or starving the DC bus So the load is not allowed to "demand" power, but is required to absorb whatever power is available from the PV frontend.
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The (short-term) constant DC "bus voltage" is easily achieved as all MPPT stages implement some kind of DC/DC converter - enabling a more or less arbitrary chioce of the DC bus voltage value.
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