Fast flexible power point tracking algorithm for photovoltaic systems using variable domain fuzzy logic control

Manliang Wang; Bingtuan Gao; Ruizhe Sun; Shibo Wang

Fast flexible power point tracking algorithm for photovoltaic systems using variable domain fuzzy logic control

Vol. 25, No. 4, pp. 604-618, Apr. 2025

10.1007/s43236-024-00917-y

Active power control

Flexible power point tracking

Fuzzy logic control

Photovoltaic systems

Variable domain

Abstract

As the penetration rate of photovoltaic (PV) power generation continues to increase, PV systems are being required to achieve frequency responses according to grid codes. In this case, PV systems do not work in the maximum power point tracking mode. Instead, they work in the flexible power point tracking (FPPT) mode, which tracks any power points on the right side of the PV power-voltage curve including the maximum power point. In this paper, a fast FPPT algorithm using variable domain fuzzy logic control (FLC) is proposed. The proposed FPPT algorithm adaptively calculates the voltage step size by FLC with a single input and a single output for low computational complexity and fast tracking speed. In addition, to further improve the tracking speed and tracking accuracy, the secant method is integrated to modify the output domain of the FLC. The secant method uses the horizontal distance between two points on the power-voltage curve of a PV array as the domain of the FLC, and this distance gradually narrows as the iteration increases. Simulation and experimental results confirm the fast dynamic response of the proposed FPPT algorithm when compared with existing fixed step size perturb and observe-based and adaptive step size perturb and observe-based FPPT algorithms under different variations of active power reference. When compared to two existing algorithms, the proposed algorithm reduces the tracking time, transient energy loss, and steady energy loss by at least 75.6, 36.3, and 5.8%, respectively.

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Cite this article

[IEEE Style]

M. Wang, B. Gao, R. Sun, S. Wang, "Fast flexible power point tracking algorithm for photovoltaic systems using variable domain fuzzy logic control," Journal of Power Electronics, vol. 25, no. 4, pp. 604-618, 2025. DOI: 10.1007/s43236-024-00917-y.

[ACM Style]

Manliang Wang, Bingtuan Gao, Ruizhe Sun, and Shibo Wang. 2025. Fast flexible power point tracking algorithm for photovoltaic systems using variable domain fuzzy logic control. Journal of Power Electronics, 25, 4, (2025), 604-618. DOI: 10.1007/s43236-024-00917-y.