Dust-accumulation power-generation loss prediction-based auxiliary decision-making method of photovoltaic-plant cleaning time

Abstract

The invention discloses a dust-accumulation power-generation-amount loss prediction-based auxiliary decision-making method of photovoltaic-plant cleaning time. The method comprises the following steps: 1) predicting a number N of days before a precipitation day with a significant cleaning effect; 2) estimating a dust-accumulation loss rate, in a case where a photovoltaic plant is not cleaned in the N days, and a dust-accumulation loss rate of the photovoltaic plant in the N days after cleaning of the next day; and 3) respectively calculating profit before and after cleaning according to estimation results, carrying out cleaning if the profit is greater than a cleaning cost, and not carrying out cleaning if the profit after cleaning is less than the cleaning cost. According to the method, aprediction method is applied to dust-accumulation power-generation-amount loss estimation of the photovoltaic plant, thus comparative analysis of whether cleaning economy exists is carried out, a technical method and an economic analysis method are fused, result accuracy thereof is higher, and economic benefits of the photovoltaic plant can be effectively increased.

Description

technical field [0001] The invention relates to an auxiliary decision-making method for cleaning timing of a photovoltaic power station based on prediction of dust-accumulated power generation loss, and belongs to the technical field of photovoltaic power generation intelligent operation and maintenance. Background technique [0002] As a green and environmentally friendly renewable energy, photovoltaic power generation has been included in the strategic level of building ecological civilization and ensuring national energy security. As of the end of 2016, the cumulative installed capacity of photovoltaics in China has reached 77.42GWp, ranking first in the world, with a total power generation of 66.2 billion kWh. With the continuous expansion of installed capacity, how to continuously improve the intelligent operation and maintenance level of photovoltaic power plants and obtain greater power generation efficiency has become an important research direction in this technical...

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Problems solved by technology

However, several important objective laws are ignored in these literatures: whether to carry out cleaning or not, it is first necessary to consider whether there will be precipitation weather with obvious cleaning effect in the future; the loss of power generation rate (amount) caused by dust accumulation depends on the dust accumulation mechanism, geography, Restricted by weather and seasonal factors, it is not a simple linear relationship; without cleaning, the loss of power generation caused by dust accumulation has a cumulative effect. Similarly, after cleaning, dust accumulation will continue to occur and have a cumulative effect

Therefore, the above methods, algorithms, and strategies have obvious flaws in principle, and it is doubtful whether the reliability and accuracy of the results can withstand the test of practice

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