Finding an optimal PV panel maximum power point tracking method

Bekker, Bernard; Beukes, H.J.

doi:10.1109/africon.2004.1406864

Cited by 65 publications

(32 citation statements)

References 2 publications

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“…The near linear relationship between V MPP and V OC of the PV array, under varying irradiance and temperature levels, has given rise to the fractional V OC method [38]- [45].…”

Section: Fractional Open-circuit Voltagementioning

confidence: 99%

“…Even if fractional V OC is not a true MPPT technique, it is very easy and cheap to implement as it does not necessarily require DSP or microcontroller control. However, [45] points out that k 1 is no more valid in the presence of partial shading (which causes multiple local maxima) of the PV array and proposes sweeping the PV array voltage to update k 1 . This obviously adds to the implementation complexity and incurs more power loss.…”

Section: Fractional Open-circuit Voltagementioning

confidence: 99%

“…Fractional I SC results from the fact that, under varying atmospheric conditions, I MPP is approximately linearly related to the I SC of the PV array as shown in [40], [42], and [45]- [48] …”

Section: Fractional Short-circuit Currentmentioning

confidence: 99%

“…In [46], a way of compensating k 2 is proposed such that the MPP is better tracked while atmospheric conditions change. To guarantee proper MPPT in the presence of multiple local maxima, [45] periodically sweeps the PV array voltage from open-circuit to short-circuit to update k 2 . Most of the PV systems using fractional I SC in the literature use a DSP.…”

Section: Fractional Short-circuit Currentmentioning

confidence: 99%

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Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques

Esram

Chapman

2007

IEEE Trans. On Energy Conversion

4,511

1,742

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“…The near linear relationship between V MPP and V OC of the PV array, under varying irradiance and temperature levels, has given rise to the fractional V OC method [38]- [45].…”

Section: Fractional Open-circuit Voltagementioning

confidence: 99%

Section: Fractional Open-circuit Voltagementioning

confidence: 99%

Section: Fractional Short-circuit Currentmentioning

confidence: 99%

Section: Fractional Short-circuit Currentmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques

Esram

Chapman

2007

IEEE Trans. On Energy Conversion

4,511

1,742

View full text Add to dashboard Cite

“…(1) to estimate the V mpp from the recorded V oc , where k = 0.77. Bekker et al [21] found that the parameter k 1 (Eq. (1)) varies by a maximum of 4% under a range of illumination levels.…”

Section: B Circuit Accuracy and Power Trade-offsmentioning

confidence: 99%

Photovoltaic Sample-and-Hold Circuit Enabling MPPT Indoors for Low-Power Systems

Weddell

Merrett

Al-Hashimi

2012

IEEE Trans. Circuits Syst. I

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Abstract-Photovoltaic (PV) energy harvesting is commonly used to power autonomous devices, and maximum power point tracking (MPPT) is often used to optimize its efficiency. This paper describes an ultra low-power MPPT circuit with a novel sample-and-hold and cold-start arrangement, enabling MPPT across the range of light intensities found indoors, which has not been reported before. The circuit has been validated in practice and found to cold-start and operate from 100 lux (typical of dim indoor lighting) up to 5 000 lux with a 55cm 2 amorphous silicon PV module. It is more efficient than non-MPPT circuits, which are the state-of-the-art for indoor PV systems. The proposed circuit maximizes the active time of the PV module by carrying out samples only once per minute. The MPPT control arrangement draws a quiescent current draw of only 8µA, and does not require an additional light sensor as has been required by previously-reported low-power MPPT circuits.

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