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Multi-power accessed substation anti-islanding system

A technology for operating systems and substations, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as circuit breakers that cannot quickly and accurately trip the connection points between small power sources and systems, and achieve safe operation protection and accurate action Efficiency improvement, safe and reliable operation effect

Inactive Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide an anti-islanding operation system for multiple power sources connected to substations. By setting up an anti-islanding operation device between the power grid and the photovoltaic substation, it solves the problem that in the prior art, when an independent island is formed, it cannot be quickly The problem of accurately tripping the circuit breaker at the connection point between the small power supply and the system

Method used

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Examples

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Embodiment 1

[0027] Embodiment one, such as figure 1 As shown, taking the 110kV Yangdian substation as an example, the 110kV Yangdian substation has two photovoltaic substations connected to the grid for power generation, and the anti-islanding operation device is installed to simplify the protection configuration of the standby automatic switching and main transformer, prevent islanding operation, and ensure the safety and stability of the power grid.

[0028] The configuration of the photovoltaic substation newly connected to Yangdian Substation is as follows: The step-up station of the photovoltaic substation is connected to the newly-built interval of the 10kVⅣ busbar of Yangdian Substation with a 10kV voltage level dedicated line. A new 10kV line from the photovoltaic substation to the 110kV Yangdian substation will be built, and the length of the new overhead line will be about 1km. The line protection configuration considers the following two options:

[0029] Solution 1: In order ...

Embodiment 2

[0110] Embodiment 2, taking the 110kV Southwest Substation as an example, the 110kV Southwest Substation has a thermal power plant that is connected to the grid through two 35kV lines and a photovoltaic substation that is connected to the grid for power generation, and an anti-islanding operation device is installed to prevent short-circuit current from being sent to the fault point when a line fault occurs As a result, the standby automatic switching and the main transformer gap protection cannot operate correctly, ensuring the safe operation of the power grid.

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Abstract

The invention discloses a multi-power accessed substation anti-islanding system which comprises a photovoltaic substation, a power grid and a grid-connected switch. The grid-connected switch is connected between the photovoltaic substation and the power grid. The system provided by the invention also comprises an anti-islanding monitoring device which is respectively connected with the photovoltaic substation, the grid-connected switch and the power grid. The anti-islanding monitoring device comprises an optical-fiber current differential protection module, a directional over-current protection module and a safety automatic switchover module. The optical-fiber current differential protection module is connected with the power grid. The directional over-current protection module is connected in series between an output line of the photovoltaic substation and an incoming line of the power grid. The safety automatic switchover module is connected with the grid-connected switch. When a line fault, a main transformer fault or a busbar fault happens to the system, the system can rapidly and accurately cuts off small grid-connected power sources by judging switch position. Thus, isolated island operation, damage to user electrical equipment and unstable operation of the system are avoided; user power supply is maintained better; and user loss is reduced.

Description

technical field [0001] The invention discloses an anti-islanding operation system for multiple power sources connected to a substation, in particular to an anti-islanding operation device for a substation where distributed power sources are connected to the grid for power generation, and belongs to the field of electric auxiliary equipment. Background technique [0002] More and more photovoltaic power plants and straw power plants are connected to the power grid. The connection of small power sources will cause unplanned islands to the power grid. When unplanned islands occur, due to the unknown power supply status of the system, it will cause the following disadvantages Impact: ①It may endanger the personal safety of grid facility maintenance personnel and users; ②Interfere with the normal closing of the grid; ③The grid cannot control the voltage and frequency in the island, thus damaging power distribution equipment and user equipment. According to the requirements of Art...

Claims

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Application Information

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IPC IPC(8): H02J13/00
CPCY02E60/723Y04S10/16Y02E60/00
Inventor 王秀茹张科
Owner STATE GRID CORP OF CHINA
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