Power grid loop-closing control method

A control method and power grid technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as low accuracy, excessive closed loop current, and enlarged power outage area, and achieve high accuracy and accuracy. The effect of power supply reliability and easy access to data

Active Publication Date: 2016-05-04
HONGHE POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, improper loop closing operation will generate excessive loop closing current, resulting in tripping of the protection action and expanding the blackout area
The loop closing op

Method used

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  • Power grid loop-closing control method
  • Power grid loop-closing control method
  • Power grid loop-closing control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] Embodiment: Take the 110kV connecting line of two 220kV substations as an example to describe the situation of main network loop closure. like figure 2 As shown, the power points of the two 220kV substations come from the 220kV busbar of the same 500kV substation, and the two 220kV substations are two three-volume substations running in parallel on the 110kV side and separately on the 35kV side, and there is no outgoing line on the 35kV side.

[0032] After the 110kV line is loop-closed, an electromagnetic ring network is formed, and the power flow distribution conforms to the characteristics of the ring network. Assuming that the voltage of the entire network is the rated voltage, ignoring the admittance branch, draw the simplified equivalent circuit, as shown in image 3 As shown, using the loop current method, the equation can be listed:

[0033] (1)

[0034] ( is the flow resistance current, is the injection current of nodes, 2 and 3)

[0035] Then use t...

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PUM

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Abstract

The invention discloses a power grid loop-closing control method which comprises the following main steps: drawing a simplified equivalent circuit according to a power grid loop-closing network; acquiring the equivalent impedance in the loop-closing ring network and the loads on buses on the two sides of a tie line; working out the complex power flowing to the tie line buses according to the characteristics of the ring network; subtracting the load flowing out of the bus on one side of the tie line from the complex power flowing to the bus to get circular complex power; calculating the loop-closing steady-state current and loop-closing impact current based on the circular complex power; and comparing the loop-closing steady-state current with the maximum allowable work current of the tie line and comparing the loop-closing impact current with the over-current quick-break protection trigger current, and judging whether loop-closing operation can be performed. The method of the invention is simple and practical, safe and reliable, and applicable to loop-closing operation of both the main network and the distribution network, and can provide a basis for power grid loop-closing operation and help power dispatchers to make reasonable and beneficial adjustment on the power grid operation mode through loop closing so as to improve the reliability of power supply and guarantee the interests of users.

Description

technical field [0001] The invention relates to the technical field of power grid loop closure, in particular to a control method for power grid loop closure. Background technique [0002] With the rapid development of the economy, the requirements for the reliability of power supply are getting higher and higher. The connection lines between different substations in the power grid provide convenience for load transfer and adjustment of operation mode. Optimizing and adjusting the power grid operation mode by closing the loop can effectively improve power supply reliability. However, improper loop closing operation will generate excessive loop closing current, resulting in tripping of the protection action and expanding the blackout area. The loop closing operation of the main network is mostly based on the experience of the dispatcher, and there are risks due to insufficient basis; the existing technology for the loop closing operation of the distribution network is not ye...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 张磊时雨陈志坚
Owner HONGHE POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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