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Calibration method and system for photoelectric conversion model

A photoelectric conversion and calibration technology, applied in the field of solar energy utilization, can solve the problems of large influence of radiation power conversion, large prediction error, uneven quality of measured data, etc. Effect

Active Publication Date: 2019-12-10
CHINA ELECTRIC POWER RES INST +2
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  • Application Information

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Problems solved by technology

In the process of short-term prediction of photovoltaic power generation through the photoelectric conversion model, the quality of historical measured data has a great influence on the radiation power conversion. However, on the one hand, it is due to the influence of factors such as sensor quality and external environment; , resulting in a lot of limited power data included in the historical accumulation data of photovoltaic power plants; the quality of measured data is often uneven, and most of the existing photovoltaic power prediction methods rely on historical data modeling. It will inevitably lead to a large prediction error. Therefore, effective filtering of abnormal data points has a prominent improvement in improving the accuracy of the photoelectric conversion model.

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  • Calibration method and system for photoelectric conversion model
  • Calibration method and system for photoelectric conversion model
  • Calibration method and system for photoelectric conversion model

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Embodiment 1

[0060] figure 1 This embodiment provides an overall flowchart of a method for calibrating a photoelectric conversion model, including:

[0061]Step S1, obtaining a modeling data set based on the acquired total radiation data and power data;

[0062] Step S2, calculating a goodness-of-fit value based on the modeling data and preset reference values;

[0063] Step S3, determining a photoelectric conversion relationship curve based on the goodness-of-fit value.

[0064] figure 2 It is a detailed flowchart of the calibration method in the embodiment of the present invention, taking the calibration method of the photoelectric conversion model suitable for photovoltaic short-term power prediction as an example, the specific steps are as follows:

[0065] Step 1: Extract meteorological observation data and historical power data of photovoltaic power plants, conduct integrity checks, eliminate missing and unreasonable data, and use them as initial samples;

[0066] Among them, me...

Embodiment 2

[0100] Taking a photovoltaic power station in Xinjiang as an example, read the measured radiation and power data of a photovoltaic power station in Xinjiang for a continuous month, and in the case of frequent power cuts in this area, use the least squares polynomial to fit the radiation-power relationship curve to obtain the data distribution. points and relationship curves such as image 3 as shown,

[0101] Among them, the radiation-power relationship: p=-2E-05x 2 +0.0297x-0.0327;

[0102] Goodness of fit: R 2 = 0.8232.

[0103] It can be seen from the data in the figure that in the section with high irradiance, the corresponding output power presents a scattered distribution. When the radiation-power conversion relationship is determined, the curve will inevitably shift and cause subsequent prediction accuracy to decline.

[0104] Next, the photoelectric conversion model is re-calibrated using the calibration method in this embodiment.

[0105] After correlation verifi...

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Abstract

The invention discloses a calibration method and system for a photoelectric conversion model. The method comprises the steps of obtaining a modeling data set based on acquired total radiation data andpower data; calculating a goodness-of-fit value based on the modeling data and a preset reference value; and determining a photoelectric conversion relation curve based on the goodness-of-fit value.According to the invention, data optimization is carried out through correlation analysis and abnormal point filtering is carried out through goodness-of-fit test, so that a good model calibration effect is achieved.

Description

technical field [0001] The invention relates to the field of solar energy utilization, in particular to a method and system for calibrating a photoelectric conversion model. Background technique [0002] New energy power forecasting technology is an indispensable support technology for new energy power generation grid connection, and plays an important role in power grid optimization scheduling, power generation plan formulation, and power station economic operation. Among them, short-term power forecasting usually refers to new energy grid-connected power forecasting in the next 72 hours. Effective short-term power forecasting can not only provide decision-making support for optimal scheduling for the power sector, but also facilitate reasonable maintenance and repair arrangements for power stations. The competitiveness of energy sources has also improved the consumption level of new energy power generation. [0003] At present, the short-term photovoltaic power generation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 吴骥程序王波王威朱想李登宣贺旭吴华华周海崔方丁煌王知嘉陈卫东周强丁杰
Owner CHINA ELECTRIC POWER RES INST