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Distributed photovoltaic grid-connected area protection method

A distributed photovoltaic and regional protection technology, applied in the field of power grid, can solve the problems of small short-circuit current and fast off-grid

Active Publication Date: 2017-02-01
NANJING NENGDI ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As far as the applicant knows, after a large number of distributed photovoltaic power sources are connected to the grid, many new protection problems have been brought about: multi-terminal power supply, small short-circuit current, and rapid off-grid after island operation, etc.
However, in the existing technology, there is no dual protection technology specifically for the main protection and regional backup protection in case of photovoltaic power grid-connected failure, which needs to be developed urgently

Method used

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Embodiment

[0032] Such as Figure 1 to Figure 2 As shown, the distributed photovoltaic grid-connected area protection method of this embodiment involves a group of distributed photovoltaic power sources (DG1-DG7), and each distributed photovoltaic power supply has a photovoltaic grid-connected interface device; the photovoltaic grid-connected interface device includes a processor, And the monitoring unit, the communication unit, the switching unit, the device interface unit (that is, the figure 2 The serial port expansion module); the exchange unit contains an uplink interface and a downlink interface; the device interface unit communicates with each device of the corresponding distributed photovoltaic power supply through the serial port.

[0033] The protection method of this embodiment includes the following steps:

[0034] The first step is to lead at least one access line (Line1, Line2) from the main grid. Each access line is equipped with a set of access points (a-h). The distan...

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Abstract

The invention relates to a distributed photovoltaic grid-connected area protection method. The method includes the steps that a distributed photovoltaic power source grid-connected protection system is built, a grid dispatching station publishes an instruction to control grid connection and removal of distributed photovoltaic power sources, and dual protection of main protection and area standby protection is performed. According to the situations of most distributed photovoltaic power source grid connection, control over the distributed photovoltaic power sources of the grid dispatching station can be effectively achieved, the current-stage distributed photovoltaic power source can be removed according to actual situations to achieve main protection, the subordinative distributed photovoltaic power sources are removed to achieve area standby protection, guarantees are provided for safe and stable operation of connecting the distributed photovoltaic power sources into a grid, convenience is provided for grid connection equipment installation and maintenance, and grid connection work of the distributed photovoltaic power sources is greatly promoted.

Description

technical field [0001] The invention relates to a method for protecting a distributed photovoltaic grid-connected area, which belongs to the technical field of power grids. Background technique [0002] As far as the applicant knows, after a large number of distributed photovoltaic power sources are connected to the grid, many new protection problems have been brought about: multi-terminal power supply, small short-circuit current, and rapid off-grid after island operation. At the same time, the existing system has basically adopted a new generation of distributed photovoltaic grid-connected interface devices (for example, application number 201310527109.6, application publication number CN103545931A, a Chinese invention patent application titled "A Distributed Photovoltaic Power Generation Grid-connected Interface Device") . However, there is no dual protection technical means for main protection and regional backup protection specifically for photovoltaic power grid-conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02H7/26
CPCY02E10/56
Inventor 陈晓宇孙幸立许平
Owner NANJING NENGDI ELECTRICAL TECH