A method to improve the islanding detection success rate of distributed photovoltaic grid-connected power generation system

A distributed photovoltaic and islanding detection technology, applied in photovoltaic power generation, AC network circuits, measuring electricity, etc., can solve the problems that cannot be used to improve the success rate of system islanding detection, and the success rate of system islanding detection is reduced, so as to eliminate the islanding. effect, improve the success rate, and ensure the effect of safety

Inactive Publication Date: 2019-02-15
上海紫竹新兴产业技术研究院
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Problems solved by technology

However, the increase in the number of micro-inverters in a distributed photovoltaic grid-connected power generation system will lead to a decrease in the success rate of islanding detection in the entire system
The method proposed in this paper cannot be used to improve the success rate of system island detection

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  • A method to improve the islanding detection success rate of distributed photovoltaic grid-connected power generation system
  • A method to improve the islanding detection success rate of distributed photovoltaic grid-connected power generation system
  • A method to improve the islanding detection success rate of distributed photovoltaic grid-connected power generation system

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[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] The invention provides a method and system for improving the success rate of island detection in a distributed photovoltaic grid-connected power generation system. A gateway-level island detection module is added to the gateway of the existing distributed photovoltaic grid-connected power generation system, so that the entire system has two-level island detection function to further improve system reliability.

[0025] figure 1 It is a system block diagram for improving the islanding detec...

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Abstract

The invention provides a method and system for increasing the island detection success rate of a distributed photovoltaic grid-connected power generation system.A gateway-level island detection module is additionally arranged on a gateway of the existing distributed photovoltaic grid-connected power generation system, and the whole system has the double-level island detection function so that the reliability of the system can be further improved.Island detection modules of miniature inverters are connected in parallel and then connected with the gateway-level island detection module in series.When power supplying of a grid system is stopped by abnormal conditions, the gateway-level island detection module can greatly increase the island detection success rate of the system, the distributed photovoltaic grid-connected power generation system is separated from a power grid, the island effect is eliminated, and the safety of system equipment and the safety of electric power overhauling persons are guaranteed.

Description

technical field [0001] The invention relates to a method and system for improving the islanding detection success rate of a distributed photovoltaic grid-connected power generation system, and belongs to the technical field of photovoltaic grid-connected power generation. Background technique [0002] The island effect refers to the phenomenon that the grid-connected inverters of each distributed generation user end still operate independently when the power supply of the grid is interrupted due to electrical failure, misoperation or natural factors. The islanding effect may cause damage to the inverter system and electrical equipment, and endanger the safety of electrical maintenance personnel. Therefore, the grid-connected inverter system must take effective islanding detection and protection measures. [0003] The micro-inverter inverts each photovoltaic cell. The advantage is that each solar panel can be independently controlled by MPPT, which can greatly improve the ov...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G01R31/00
CPCG01R31/00H02J3/383H02J3/388Y02E10/56
Inventor 傅继星袁景淇李少远陈友仁
Owner 上海紫竹新兴产业技术研究院
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