110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing

A technology of protection action and control action, applied in the direction of electrical components, circuit devices, etc., to avoid adverse effects

Inactive Publication Date: 2014-12-24
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This strategy integrates reclosing and standby automatic switching control with wide-area protection system, can make full use of wide-area information

Method used

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  • 110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing
  • 110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing
  • 110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing

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Embodiment Construction

[0021] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Figure 1 is a typical wiring diagram of a 110kV power grid composed of 110kV substation incoming lines, where Figure 1a "3T" wiring mode for dual power supply, Figure 1b "3T" wiring mode for three power supplies. figure 2 It is a typical main wiring diagram of a 110kV substation, in which the low-voltage side of the main transformer of the incoming line 2 is a low-voltage double-branch wiring mode, which is beneficial to the load sharing after the standby automatic switching operation. image 3 It is a typical wiring diagram of a 110kV substation with DG connected, in which DG may be directly connected to the 10kV busbar. At this time, the circuit breaker at the main transformer low-voltage side protection is the upstream decoupling point of the isolated island, and it may also be connected to the 10kV...

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Abstract

The invention relates to a 110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing. The strategy includes the procedures: main transformer high-tension side protection is modified and matched with 110kV incoming line upstream opposing side protection to form pilot protection used for removing incoming line failures; after the main transformer high-tension side protection acts, communication with an information processing center is made, and the information processing center performs analysis according to action information of main transformer low-tension protection and action information of the main transformer high-tension side protection; reclosure of the main transformer high-tension side protection is modified; the reclosure of the main transformer high-tension side protection and another protection cooperate in such a manner that the protection action is accelerated after the reclosure; the reclosure is started in such a manner that the protection action starts; action time of the reclosure is later than action time of reclosure of a 110kV incoming line. The strategy has the advantages that power outage range can be narrowed, power outage time is shortened, the ability of the DG to supply electricity is given to full play, and reliability of power supply for a load is guaranteed.

Description

Technical field [0001] The invention belongs to the field of power system distribution network protection and control, and relates to a wide-area information-based 110kV substation protection, reclosing and standby automatic switching operation coordination strategy that can adapt to distributed power supply access. Background technique [0002] Distributed generation (distributed generation, DG) is a new type of electric energy, including photovoltaic power generation system, wind power generation system, micro gas turbine power generation system, etc. Distributed power generation technology has a series of advantages such as environmental protection and economy, and can well meet people's requirements for power safety, stability and economic environmental protection. It has attracted widespread attention and has been gradually promoted and developed. However, the access of DG to the distribution network also brings new problems and challenges to the protection and control ...

Claims

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Application Information

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IPC IPC(8): H02J13/00
Inventor 李永丽陈晓龙许永军叶志锋赵曼勇文安刘年魏承志黄维芳金鑫杨颖安姜超
Owner TIANJIN UNIV
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