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Group control method for multi-inverter solar photovoltaic grid-connection electricity generating system

A solar photovoltaic and grid-connected power generation technology, which is applied in the direction of light radiation generators, generators/motors, single-network parallel feeding arrangements, etc., to achieve the effects of improving stability, avoiding frequent operations, and prolonging service life

Inactive Publication Date: 2010-10-13
YUNNAN POWER GRID +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, there are relatively few researches on the group control technology of solar photovoltaic grid-connected power plants at home and abroad.

Method used

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  • Group control method for multi-inverter solar photovoltaic grid-connection electricity generating system
  • Group control method for multi-inverter solar photovoltaic grid-connection electricity generating system

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Embodiment Construction

[0029] The group control method of the multi-inverter solar photovoltaic grid-connected power generation system proposed by the present invention, the connection schematic diagram of the grid-connected power generation system is as follows figure 1 As shown in the figure, 1 is a solar panel, 2 is a parallel switch, 3 is an inverter, and 4 is an AC bus. Include the following steps:

[0030] (1-1) so that every adjacent four solar panel-inverter pairs starting from the beginning in the power generation system form a group;

[0031] (1-2) Judging the input power of the inverters in each solar panel-inverter pair and the position of the parallel switch, if all the parallel switches are in the closed position, and the first inverter When the input power of the inverter is greater than the set upper limit threshold, the parallel switch between the second inverter and the third inverter is opened, and the third inverter is operated;

[0032] If the parallel switch between the first...

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Abstract

The present invention relates to a group control method for multi- inverter solar energy photovoltaic grid-connected power generation system which belongs to the technical field of new energy power generation system control. The method performs round robin group control to solar panel-inverter in power generation system; when input power of the inverter smaller than preset lower limit threshold, the solar panel is connected to a inverter to output after parallel connection; in the process of parallel switch opening and closing process, keep the solar panel output continuously at maximal poweralways; the method provides self-adapting judge to illuminance abrupt variation as pre-boot condition of control. The method of the invention is provided with following features: can enhance conversion efficiency of the inverter and the solar panel at the same time; can reduce operation times of the paralleling switch and the inverter; and can prolong equipment service life and system output power smooth and steady in control process.

Description

technical field [0001] The invention relates to a group control method for a multi-inverter solar photovoltaic grid-connected power generation system, and belongs to the technical field of new energy power generation system control. Background technique [0002] Solar photovoltaic grid-connected power generation can not only reduce the pressure of energy crisis and alleviate the power shortage at peak time, but also protect and improve the environment. It is an important part of the long-term energy strategy supported by many governments including my country. Solar photovoltaic grid-connected power generation has just started in my country. For a solar photovoltaic grid-connected power generation system composed of large-area solar panels and multiple inverters, adding group control technology and devices is an effective way to improve the efficiency of the power generation system and the quality of grid-connected power. measure. At present, there are relatively few research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02N6/00
Inventor 韩郁叶锋张岚方廷
Owner YUNNAN POWER GRID
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