Temperature-based MPPT algorithm to improve PV system efficiency

Jul 29, 2020 09:36 AM ET
  • Researchers in Spain have actually created a maximum power point monitoring (MPPT) algorithm based on just one input parameter-- PV module temperature. The formula has actually already shown stability in screening, the scientists claim.
Temperature-based MPPT algorithm to improve PV system efficiency
Image: Jonathan Cutrer, flickr

Researchers from Spain's University of the Basque Country have actually developed an unique maximum power point tracking (MPPT) algorithm based on temperature to enhance PV system efficiency.

The researchers stated temperature has actually been utilized as a variable since gauging irradiance is more costly. "The temperature level is a smoother variable than the irradiance, hence the control does not require to alter the optimum present feature so quickly," they clarified.

The formula is specified as the parametrization of an optimum current feature, which is strictly depending on temperature, and is claimed to be able to determine this function for every temperature level. "By using this ideal current direct function, the formula calculates the current collection factor," the academics described. "In that means, the control compels the PV module to operate in the optimum existing line."

The formula has already shown stability in testing, with MPPT control always merging at the ideal factor after several cycles. The proposed control algorithm is additionally based upon the Lyapunov function, which is a scalar function commonly used to show the security of a dynamic system. This function, specifically, is in charge of compeling a solar module to operate linearly to reach its maximum power factor in simply a couple of steps, the study group claimed.

Traditional MPPT formulas such as those based upon perturb and observe (P&O) or step-by-step conductance (IC) approaches have the advantage of being flexible and also robust. However, they likewise have the downside of displaying an oscillating habits around the maximum power point. "They move the operating point around the MPP yet they do not get to precisely the MPP," the researchers claimed.

By comparison, the recommended formula has only one input-- PV module performance. "It makes our Lyapunov-based formula easy to execute," the academics stated. "This control law can be executed into a PV module control system with a sensibly inexpensive."

The scientists acknowledged that the formula only functions properly if precise PV modeling is executed. "Additional study regarding just how the MPPT based temperature control established in the current work would act in unwanted scenarios in solar panels such as partially shaded, failings or failures is needed," they claimed.

They just recently presented their algorithm in "Temperature based optimal power factor monitoring for photovoltaic components," which was published in Scientific Reports.