Reducing partial shading power loss with an integrated Smart Bypass

Bauwens, Pieter; Doutreloigne, Jan

doi:10.1016/j.solener.2014.01.040

Cited by 53 publications

(26 citation statements)

References 14 publications

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“…Switch control is comprised of three distinct circuits: Circuit A, which keeps the switch in the off-state, Circuit B to turn the switch on or off and Gate Protection Circuit (GPC), which protects the gate of T 1 from possible overvoltage. For a more complete elaboration of the switch control, we refer to [13].…”

Section: General Operationmentioning

confidence: 99%

“…When the input voltage of the Schmitt trigger drops below the threshold voltage of a PMOS (present in the input stage of the Schmitt trigger) this storage capacitor is continuously drained, decreasing the supply voltage. To work around this, C timer is quickly discharged once its voltage drops below the PMOS threshold voltage (see also [13]). The measurement results are collected in Figure 8.…”

Section: Timermentioning

confidence: 99%

“…Such a "smart bypass" is one of the building blocks for smart PV modules [12]. In [13], a proof-of-concept of such a smart bypass is presented. This paper elaborates on a new and improved version of this smart bypass, the NMOS-based Integrated Modular Bypass for Use in Solar systems (NIMBUS) chip.…”

Section: Introductionmentioning

confidence: 99%

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NMOS-Based Integrated Modular Bypass for Use in Solar Systems (NIMBUS): Intelligent Bypass for Reducing Partial Shading Power Loss in Solar Panel Applications

Bauwens

Doutreloigne

2016

Energies

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NMOS-based Integrated Modular Bypass for Use in Solar systems (NIMBUS) is designed as a replacement for the traditional bypass diode, used in common solar panels. Because of the series connection between the individual solar cells, the power output of a photovoltaic (PV) panel will drop disproportionally under partial shading. Currently, this is solved by dividing the PV panel into substrings, each with a diode bypass placed in parallel. This allows an alternative current path. However, the diodes still have a significant voltage drop (about 350 mV), and due to the fairly large currents in a panel, the diodes are dissipating power that we would rather see at the output of the panel. The NIMBUS chip, being a low-voltage-drop switch, aims to replace these diodes and, thus, reduce that power loss. NIMBUS is a smart bypass: a completely stand-alone system that detects the failing of one or more cells and activates when necessary. It is designed for a 100-mV voltage drop under a 5-A load current. When two or more NIMBUS chips are placed in parallel, an internal synchronization circuit ensures proper operation to provide for larger load currents. This paper will elaborate on the operation, design and implementation of the NIMBUS chip, as well as on the first measurements.

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Section: General Operationmentioning

confidence: 99%

Section: Timermentioning

confidence: 99%

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NMOS-Based Integrated Modular Bypass for Use in Solar Systems (NIMBUS): Intelligent Bypass for Reducing Partial Shading Power Loss in Solar Panel Applications

Bauwens

Doutreloigne

2016

Energies

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“…When bypass diodes conduct, they introduce certain voltage drop and consume power generated by the photovoltaic module. Hence, it brings impact to the maximum power delivered by the photovoltaic modules [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of bypass diode configurations to the maximum power of photovoltaic module

Teo¹,

Tan²,

Mok³

et al. 2017

SGCE

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Effects of bypass diode configurations to the maximum power of photovoltaic module are presented. The impacts of one, two and three bypass diodes configurations to the photovoltaic module are investigated using simulation approach. Simulink models are developed to perform all the simulations in this investigation. In the investigation, various shading patterns are applied to one, two and three bypass diodes configurations to investigate the impact of bypass diode configuration to the maximum power of photovoltaic module. Simulation results show that the bypass diode configurations doesn't affect the maximum power of the photovoltaic module under certain shading conditions. The comparison study among one, two and three bypass diodes configurations show a greater quantity of bypass diode in a photovoltaic module doesn't guarantee better performance during partial shading condit

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“…of simulation models [3][4][5], measurements of I-V characteristics [6][7][8], a proposal of a modified bypass circuit [9,10]. Thus, the configuration of BDs in PV modules has an important influence in the possibility of hot spot apparition and the reliability of the PV system.…”

mentioning

confidence: 99%

Evaluation of Heat and Current Characteristics of Bypass Diodes for Fault Detection in Photovoltaic Module

Okajima¹,

Hakura²

2017

JEPE

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Abstract:In recent years, PV (photovoltaic) systems have been installed rapidly around the world. However, there is often a delay in the practical application of fault detection in PV systems. In this study, the temperature of BD (bypass diodes) mounted on PV modules was measured for simple and practical fault detection. The temperature of the BD of Module 31 was higher than other modules and a large current passed through one of the BDs. Measuring BD temperatures is easier than other conventional methods of fault detection. From the results of the rise in BD temperature under dark conditions, the increase in temperature increased linearly with increasing current flow. There is a proportional relationship between heat generated and the increasing temperature of the terminal box. The experimental results about surface temperature of the junction box in actual system operation suggested that the electric current through a BD in a terminal box can be known by measuring the surface temperature of the terminal box for PV module fault detection without a system shutdown. Moreover, we tried to evaluate temperature distribution of a terminal box using heat conduction equations. The evaluated results agreed well with the measured results.

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Reducing partial shading power loss with an integrated Smart Bypass

Cited by 53 publications

References 14 publications

NMOS-Based Integrated Modular Bypass for Use in Solar Systems (NIMBUS): Intelligent Bypass for Reducing Partial Shading Power Loss in Solar Panel Applications

NMOS-Based Integrated Modular Bypass for Use in Solar Systems (NIMBUS): Intelligent Bypass for Reducing Partial Shading Power Loss in Solar Panel Applications

Effects of bypass diode configurations to the maximum power of photovoltaic module

Evaluation of Heat and Current Characteristics of Bypass Diodes for Fault Detection in Photovoltaic Module

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