New MPPT algorithm for bidirectional inverter design – pv journal Worldwide – pv journal Worldwide

A newly proposed inverter concept is based on a solar charge controller with maximum power point tracking. It is based on an artificial school of fish algorithm that offers high convergence speeds, flexibility, fault tolerance and accuracy.

August 27, 2020

Researchers at the University of Science and Technology in China have developed a novel topology for a bidirectional inverter for an uninterruptible power supply (UPS).

The proposed battery-backed inverter concept is based on an MPPT (Maximum Power Point Tracking) solar charge controller based on an artificial school of fish algorithm and inspired by the collective movement of fish and their instinctive behavior. This algorithm is designed to provide high convergence speeds, flexibility, fault tolerance, and accuracy. The scientists said that the P&O (Perturb and Observ) algorithm, most commonly used for PV applications, has a number of drawbacks.

The newly developed algorithm works in two steps. The first step includes a method of observing variable disturbances to determine the maximum power point of the system. In the second step, the proposed device uses the school of fish algorithm to quickly find and track the global maximum power point.

The PSpice software was used for the model simulation, with which the volt-ampere characteristic curve of the PV system power was to be determined. "The solar array simulator was used to check the effect of tracking the maximum power point at different light intensities," the researchers said.

The open circuit voltage of the simulator was 193.785 volts while the short circuit current was 2.6786 amps. The ambient temperature was 27 ° C and the lighting power density was 1,000 W / m2. The simulation showed that the MPPT tracking has an average efficiency of 99.5% and a maximum efficiency of 99.9%.

"According to the curves of output power, voltage and current of the solar panel in 60 seconds, the boost circuit can track the maximum power point by 10 seconds," the researchers said.

The inverter is suitable for an uninterruptible power supply in the event of a power failure. "The distortion rate of the grid-connected current waveform was within 2% and the DC component was less than 0.5%," said the scientists. “The full bridge inverter can be reverse rectified by connecting the blocking diode in parallel to the full bridge switch. It offers power generation the ability to charge the battery. "

They presented the new inverter topology in the "Bidirectional Energy Storage Photovoltaic Inverter Application System" recently published in the International Journal of Energy Research.

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