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Open AccessArticle

An Improved Forecasting Method for Photovoltaic Power Based on Adaptive BP Neural Network with a Scrolling Time Window

by Honglu Zhu 1,2,3, Weiwei Lian 2, Lingxing Lu 2, Songyuan Dai 1,2,3 and Yang Hu 1,*
1
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing 102206, China
2
School of Renewable Energy, North China Electric Power University, Changping District, Beijing 102206, China
3
Beijing Key Laboratory of New and Renewable Energy, North China Electric Power University, Changping District, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Energies 2017, 10(10), 1542; https://doi.org/10.3390/en10101542
Received: 25 August 2017 / Revised: 11 September 2017 / Accepted: 1 October 2017 / Published: 6 October 2017
Due to the large scale of grid-connected photovoltaic (PV) power generation installations, accurate PV power forecasting is critical to the safe and economic operation of the electric power system. In the paper, by analyzing the influence of external ambient factors and the changing characteristics of PV modules with time, it is found that PV power generation is a nonlinear and time-varying process. This suggests that a certain single forecasting model is inadequate for representing actual generation characteristics, and it is difficult to obtain an accurate forecasting result. An adaptive back propagation (BP) neural network model adopting scrolling time window is proposed to solve the problem. Via an update of the training data of BP neural network with the scrolling time window, the forecasting model adapts to time and a changing external environment with the required modeling precision. Meanwhile, through evaluation of the forecasting performance in different time windows, an optimized time window can be determined to guarantee accuracy. Finally, using the actual operation data of a PV plant in Beijing, the approach is validated as being applicable for PV power forecasting and is able to effectively respond to the dynamic change of the PV power generation process. This improves the forecasting accuracy and also reduces computation complexity as compared with the conventional BP neural network algorithm. View Full-Text
Keywords: photovoltaic (PV) power generation; power forecasting; artificial neural network; dynamic model photovoltaic (PV) power generation; power forecasting; artificial neural network; dynamic model
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Zhu, H.; Lian, W.; Lu, L.; Dai, S.; Hu, Y. An Improved Forecasting Method for Photovoltaic Power Based on Adaptive BP Neural Network with a Scrolling Time Window. Energies 2017, 10, 1542.

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