Power grid loop-closing control method

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...

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 operation of the main network is mostly based on the experience of the dispatcher, and there are risks due to insufficient basis. supply, the application rate of the ring transfer is low

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