Abstract

The efficiency of photovoltaic (PV) systems depends directly on solar irradiation, so drastic variations in solar exposure will undoubtedly move its maximum power point (MPP). Furthermore, the presence of partial shading conditions (PSCs) generates local maximum power points (LMPPs) and one global maximum power point (GMPP) in the P-V characteristic curve. Therefore, a proper maximum power point tracking (MPPT) technique is crucial to increase PV system efficiency. There are classical, intelligent, optimal, and hybrid MPPT techniques; this paper presents a novel hybrid MPPT technique that combines Surface-Based Polynomial Fitting (SPF) and Perturbation and Observation (P&O) for solar PV generation under PSCs. The development of the experimental PV system has two stages: (i) Modeling the PV array with the DC-DC boost converter using a real-time and high-speed simulator (PLECS RT Box), (ii) and implementing the proposed GMPPT algorithm with the double-loop controller of the DC-DC boost converter in a commercial low-priced digital signal controller (DSC). According to the simulation and the experimental results, the suggested hybrid algorithm is effective at tracking the GMPP under both uniform and nonuniform irradiance conditions in six scenarios: (i) system start-up, (ii) uniform irradiance variations, (iii) sharp change of the (PSCs), (iv) multiple peaks in the P-V characteristic, (v) dark cloud passing, and (vi) light cloud passing. Finally, the experimental results—through the standard errors and the mean power tracked and tracking factor scores—proved that the proposed hybrid SPF-P&O MPPT technique reaches the convergence to GMPP faster than benchmark approaches when dealing with PSCs.

Highlights

  • The proposed Surface-Based Polynomial Fitting (SPF)-Perturbation and Observation (P&O) maximum power point tracking (MPPT) method is compared with a GMPPT P&O algorithm studied in [13], which realizes a voltage swept in partial shading conditions across the entire voltage range for the PV system

  • The inner current loop is updating at 25 kHz, the outer voltage loop is calculating at 2.5 kHz, and the MPPT strategy is computing at 10 Hz, these strategies are implemented in the digital signal controller (DSC)

  • A fast-tracking hybrid MPPT technique based on Surface-Based Polynomial Fitting and P&O has been presented for solar PV under partial shading conditions (PSCs)

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Summary

A Fast-Tracking Hybrid MPPT Based on Surface-Based

Catalina González-Castaño 1,† , Carlos Restrepo 2, *,† , Javier Revelo-Fuelagán 3,† , Leandro L.

Introduction
PV Modeling
Discrete-Time Sliding-Mode Current Control
Discrete-Time PI Voltage Control
Conventional “Perturb and Observe” Method
Proposed MPPT Method
Surface-Based Fitting
Simulation and Real-Time HIL Results
Inner-Loop Current Control Results
Double-Loop Results
Scenario 1
Scenario 2
Scenario 3
Scenario 4
Scenario 5
Scenario 6
Findings
Conclusions
Full Text
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