Photovoltaic power station accumulated dust economic cleaning calculation method

Abstract

The invention discloses a photovoltaic power station accumulated dust economic cleaning calculation method. According to the method, some components are selected from the components of a photovoltaicpower station as components to be cleaned. The method includes the following steps that: S1, a daily cumulative generated power quantity theoretical value Qn and daily cumulative generated power quantity actual value Qc of the components to be cleaned are obtained; S7A, rainfall information x is determined according to weather forecast, a post-rain power loss value K is predicted according to therainfall information x; S7B, a pre-rain estimated generated power quantity loss amount ME is calculated according to the weather forecast, the generated power loss rate R of a current day and the average generated power quantity of sunny days and cloudy days in recent Y days; the step S7A and S7B are carried out simultaneously or sequentially, if the post-rain power loss value K is larger than M%or the pre-rain estimated generated power quantity loss amount ME is larger than S% of cleaning costs D, the method directly shifts to step S8, otherwise, the method returns to step S1 for continuousmonitoring; and S8, the components of the photovoltaic power station are cleaned. According to the method, the most economical photovoltaic assembly cleaning period can be determined on the basis of weather forecast information.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to an economical cleaning calculation method for ash accumulation in a photovoltaic power station. Background technique [0002] The power generation of photovoltaic power plants is easily affected by environmental factors such as light conditions and temperature. Photovoltaic modules are operated outdoors all the year round, and the accumulation of dust on the surface of the modules is inevitable. Dust occlusion will greatly reduce the output power of photovoltaic modules, thereby affecting the power generation of photovoltaic power plants. [0003] At the same time, the accumulation of dust will form hot spots on the surface of the module, which will affect the life of the photovoltaic module. Studies have shown that dust accumulation on the surface of photovoltaic modules can cause 3% to 30% loss of power generation. Therefore, detecting the dust on the surface o...

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Problems solved by technology

[0005] The disadvantages of these two methods for judging the timing of operation and maintenance cleaning are: (1) the human judgment of the naked eye is relatively random; (2) the cost of cleaning operation and maintenance of the power station is relatively high, and the method of judging the current or power difference after cleaning is adopted It is not accurate enough, there is no comparison basis for power generation loss and cleaning cost, and it does not meet the requirements of fine management of large-scale power plant operation and maintenance; (3) Natural rainfall can also achieve the effect of cleaning photovoltaic modules

If natural rainfall occurs shortly after manual cleaning, it must be a waste of manpower and material resources

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