Abstract
This article investigates the performance of serial-parallel (SP) configuration of photovoltaic (PV) array under artificial arrangement for partial shading conditions (PSCs). The concept of bypass diode (BPD) is a very attractive solution to reduce the shading effect on the PV module and therefore gives better performance in such shading environment types. Various bypass diode integration (BPD) placement topologies with the solar photovoltaic (PV) modules are being investigated to demonstrate the improved performance under PSCs in the current work. The sixteen PV modules arranged in SP configuration are associated with the BPD Topologies such as (a) Without bypass diode (W–BPD) (b), Single string- single bypass diode (SS–SBPD) (c) Single string- double bypass diode (SS–DBPD) (d) Series group- bypass diode (G–BPD) (e) Staggered group- bypass diode (SG–BPD) (f) Multi level-octal bypass diode (ML–OBPD) for performance investigation. The performance assessment for all PV array supported by BPD topologies has been investigated using current–voltage (I–V) and power–voltage (P–V) characteristics and comparing to show better power and voltage results at global maximum power point (GMPP), improved fill factor and minimized power losses etc. The results presented may be recommended for the appropriate PV array configuration interconnection of BPD. Overall, this article reports that the ML–OBPD based SP configured PV array is superior among the BPD topologies under the considered PSTCs.
Highlights
The bypass diode (BPD) have the capacity to reduce the hot spot problem that may damage PV cells and even cause fire if the illumination of the PV cell's surface in a PV module is not consistent
In this paper, under the four distinctive shadow test cases: I-IV, a MATLAB/Simulation is performed for the performance assessment of BPD placement topologies in serial - parallel (SP) configured PV array system
In shading test case -I: global maximum power point (GMPP) power is obtained as 1363W and power losses are minimized as 1367W for the topologies of the Series G- BPD and ML-OBPD
Summary
The BPDs have the capacity to reduce the hot spot problem that may damage PV cells and even cause fire if the illumination of the PV cell's surface in a PV module is not consistent. The authors of [21] developed a W-BPD Magic -Square (MS) PV Array configuration that provides 44% more output power than traditional TCT based PV configuration. It was pointed out in similar research work in [22] that, under defective conditions, the GMPPs of the reconfigured PV array connection is 4% to 5% higher than conventional configurations. In [23], the authors have argued that PV array configurations based on the number of methods placed generate 6.2% higher power than TCT configurations dependent on N-OBPDs topology.
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