Detection method of clear sky periods based on generalized atmosphere turbidity
A detection method and turbidity technology, applied in the detection field, can solve the problems of PV injection into grid active power and grid frequency adverse effects, excessive fluctuation of irradiance, reduction of instantaneous output power of PV power generation system, etc., so as to improve timeliness, The effect of reducing construction costs and reducing the amount of data
Active Publication Date: 2018-01-19
HARBIN ENG UNIV
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Under non-clear sky conditions, if the irradiance reaching the surface of the photovoltaic panel through the clouds is too low or the irradiance fluctuates too much, it will seriously reduce the instantaneous output power of the PV power generation system, and further affect the active power injected into the grid by PV and the frequency of the grid. cause adverse effects
For this kind of situation, the current power grid system’s response strategy is mostly to adopt the emergency input of hot reserve capacity; if this happens more frequently, the parallel grid will even adopt a scheduling strategy of temporarily cutting off PV
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[0043] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0044] combine Figure 1-3 Atmospheric turbidity originally only represents the atmospheric turbidity under ideal clear-sky conditions (hereinafter referred to as "atmospheric turbidity in the narrow sense" or "atmospheric turbidity in clear sky"). The attenuation effect, the influence of clouds on the ground irradiance is also incorporated into the atmospheric turbidity to characterize, here defined as "generalized atmospheric turbidity" (hereinafter referred to as atmospheric turbidity, and denoted as ). In the present invention, the former "atmospheric turbidity in a narrow sense" is referred to as "clear sky atmospheric turbidity", and recorded as In clear sky conditions, and The values of are the same, both represent the attenuation of irradiance by atmospheric components; in non-clear sky (such as cloudy, cloudy, etc.) weather conditions, The val...
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The objective of the invention provides a detection method of clear sky periods based on generalized atmosphere turbidity. The method comprises following steps of detecting the perpendicular incidenceirradiancy I(tk) at the current moment through a perpendicular incidence irradiancy sensor, where in the time interval of the detection is deltat; calculating the generalized atmosphere turbidity shown in the description and calculating clear sky atmosphere turbidity; and judging whether the state is the clear sky state. According to the invention, by bringing the effects of shielding of clouds into the generalized atmosphere turbidity, the atmosphere turbidity is calculated by use of the perpendicular incidence irradiancy I(tk) at the current moment and compared with the clear sky atmosphereturbidity, so the current sky state (whether the sky is clear) can be obtained finally; data quantity required by the clear sky detection can be reduced; timeliness of the detection is improved; andmeanwhile, construction cost of a clear sky detection system required by addition of the detection device can be reduced.
Description
technical field [0001] The invention relates to a detection method, in particular to a detection method of a clear sky state. Background technique [0002] With the gradual integration of large-scale photovoltaic (PV) power generation systems into the power grid, the impact of photovoltaic power generation on the power grid is increasing. The photovoltaic power generation system relies on the photovoltaic array to convert solar energy into electrical energy. The instantaneous output power of the photovoltaic power generation system is mainly related to the instantaneous solar irradiance of the geographical location where the photovoltaic array is located. The so-called solar irradiance here refers to the radiant energy per unit area on the solid earth surface after the solar radiation passes through the absorption, scattering, reflection and other effects in the process of atmospheric transmission. [0003] During the transmission of solar radiation from the sun to the surf...
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Inventor 刘宏达韩阳戴成张晴王禹婷戚晓侠李雅楠王琦杨双铭李志鹏
Owner HARBIN ENG UNIV