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Grid-connected and off-grid selection method based on refined output of photovoltaic power stations

A photovoltaic power station, photovoltaic power generation technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as the inability to meet the needs of grid connection and withdrawal

Active Publication Date: 2020-11-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Grid connection and withdrawal can happen at any time, so in the existing technology, the processing of power stations still stays in the stage of days, which cannot meet the needs of grid connection and withdrawal

Method used

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  • Grid-connected and off-grid selection method based on refined output of photovoltaic power stations
  • Grid-connected and off-grid selection method based on refined output of photovoltaic power stations
  • Grid-connected and off-grid selection method based on refined output of photovoltaic power stations

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Embodiment Construction

[0067] The specific implementation manner and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0068] A grid-connected and off-grid selection method based on the refined output of photovoltaic power stations, combined with figure 1 It can be seen that the following steps are involved:

[0069] S1: Select the pre-selected grid-connected photovoltaic power station, obtain the photovoltaic power station cluster, and obtain the photovoltaic power station cluster data and the historical output data of all photovoltaic power stations in the photovoltaic power station cluster;

[0070] S2: Select the daily output characteristic index of the photovoltaic power station, and calculate all the daily output characteristic index values ​​of a single photovoltaic power station;

[0071] S3: Divide the daily output characteristic index of the photovoltaic power station to obtain the sub-period output charac...

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Abstract

The present invention discloses a grid-connection and grid-retraction selection method based on refined output of a photovoltaic power station. The method comprises the following steps of: selecting apre-selected grid-connection photovoltaic power station, obtaining a photovoltaic power station cluster, and obtaining data of the photovoltaic power station cluster and historical output data of allthe photovoltaic power stations in the photovoltaic power station cluster; selecting daily output feature indexes of the photovoltaic power stations, and calculating all the daily output feature index values of each photovoltaic power station; performing division of the daily output feature indexes of the photovoltaic power stations to obtain sub-period output feature index values; setting weights of all the feature index values to obtain the grid-connection and grid-retraction impact coefficient of each photovoltaic power station, and performing pre-selection of the photovoltaic power stations with grid-connection and grid-retraction according to the grid-connection and grid-retraction impact coefficients; and according to the final photovoltaic power station cluster, calculating an output feature index value of a current photovoltaic power station cluster to perform assessment of a current power grid and obtain a final grid-connection and grid-retraction selection result. The grid-connection and grid-retraction selection method is more stable compared to an original power gird, and is good in selection reliability.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a selection method for grid connection and grid withdrawal based on the refined output of photovoltaic power stations. Background technique [0002] With the shortage of global fossil energy, clean, renewable, and abundant solar energy has developed rapidly. However, due to the intermittent, random and volatile characteristics of solar energy, the fluctuation of the output power of photovoltaic power generation will inevitably bring difficulties to the centralized grid connection of large-scale power stations. Through the scientific description of the photovoltaic power generation output curve, the photovoltaic power generation output curve is: the output power curve drawn according to the output power value collected at the time of sampling points at different times. Grid dispatchers can more accurately grasp the characteristics and laws of photovoltaic ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/383H02J2203/20Y02E10/56
Inventor 左为恒陈世游李昌春陆海
Owner CHONGQING UNIV
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