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Grid-connected inverter and circuit for detecting island thereof

An island detection and inverter technology, applied in the power field, can solve the problems of equipment and personnel safety hazards, damage to equipment, islanding and other problems, and achieve the effect of preventing the phenomenon of islanding.

Active Publication Date: 2012-03-28
SHENZHEN JINGQUANHUA ELECTRONICS
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AI Technical Summary

Problems solved by technology

[0002]Islanding effect means that when the grid-connected inverter supplies power to the grid, the power supply is interrupted due to electrical failure, misoperation or spontaneous combustion factors, etc., but at this time the grid-connected inverter The inverter will still continue to deliver a certain percentage of power to the grid, resulting in islanding
The island effect will bring serious hidden dangers to the safety of equipment and personnel
When the power supply of the grid is interrupted, when the maintenance personnel are overhauling the power lines and power equipment of the grid, if the grid-connected inverter continues to supply power, it will cause casualties; if the grid-connected inverter continues to supply power, once the grid is restored, The output voltage and phase of the grid and the grid-connected inverter may have a large difference, which will generate a large inrush current in an instant and damage the equipment

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  • Grid-connected inverter and circuit for detecting island thereof
  • Grid-connected inverter and circuit for detecting island thereof
  • Grid-connected inverter and circuit for detecting island thereof

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0021] Most of the island effect is caused by the power failure of the main network due to misoperation or spontaneous combustion factors. Aiming at the cause, we propose a method to prevent the islanding effect by monitoring the grid voltage fluctuation in real time. The power failure of the main grid will inevitably cause fluctuations in the grid voltage, and the output voltage of the inverter connected in parallel to the grid will also be affected, and it will become higher or lower instantaneously. Design a monitor to capture this jump process to measure the power grid.

[0022] Analysis of the principle of the monitor: The detection circuit includes a sampling circuit, a signal processing circuit composed of a comparator and a micr...

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Abstract

The invention discloses a grid-connected inverter and a circuit for detecting an island thereof. A sampling circuit and a comparator acquire the voltage of a power grid, and the acquired voltage is analyzed by two comparators; after signal processing, the fluctuation condition of the power grid can be effectively monitored by monitoring the level fluctuation of two output ends OUT1 and OUT2. Whenthe power grid normally works, the output of the output end OUT1 is high and the output of the output end OUT2 is low; when the voltage of the power grid suddenly rises due to a failure of the power grid, the output of the output end OUT1 is low and the output end OUT2 is kept unchanged at low level; and when the voltage of the power grid suddenly drops, the output of the output end OUT2 is high and the output end OUT1 is kept unchanged at high output. A microprogrammed control unit (MCU) of a system adopts a certain algorithm in the process of monitoring the OUT1 and the OUT2 to prevent error detection caused by interference on the power grid. The detection circuit can effectively monitor the voltage of the power grid to prevent islanding.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a grid-connected inverter and an islanding detection circuit thereof. Background technique [0002] The island effect means that when the grid-connected inverter is supplying power to the grid, the power supply is interrupted due to electrical failure, misoperation or spontaneous combustion, but at this time the grid-connected inverter will still continue to deliver a certain proportion of electric energy to the grid, resulting in The island phenomenon. The island effect will bring serious hidden dangers to the safety of equipment and personnel. When the power supply of the grid is interrupted, when the maintenance personnel are repairing the power lines and power equipment of the grid, if the grid-connected inverter continues to supply power, it will cause casualties; if the grid-connected inverter continues to supply power, once the grid is restored, The output voltage and phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
Inventor 谢春华刘建飞张立品鞠万金汪兆华李战功窦晓月
Owner SHENZHEN JINGQUANHUA ELECTRONICS
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