Distribution network loop closing power supply switching method

Abstract

The invention discloses a distribution network loop closing power supply switching method. The method comprises the following steps: proving that a linear relation exists between bus load on two sides of a loop closing point interconnection switch and loop current complex power of a loop closing point through analysis; deriving a practical calculation formula of a steady-state current and an impact current of an interconnection line outlet circuit breaker through simulation; introducing the practical calculation formula into an SCADA system; calculating the steady-state current and the impact current of the interconnection line outlet circuit breaker, and calculating the sum of load currents of two interconnection lines; then comparing with related data, and judging whether the operations of loop closing, loop disconnecting and power supply switching can be performed accordingly. The method disclosed by the invention is simple and practical, data are easily acquired, and equipment does not need to be added, so that complicated complex operation is avoided, the method is easy to implement, higher in precision and accuracy and lower in error, a powerful basis can be provided for the distribution network loop closing power supply switching operation of a power dispatcher, the power distribution reliability is effectively improved, the outage cost is reduced, and the method has extremely high application values.

Description

technical field [0001] The invention relates to the technical field of distribution network closure, in particular to an operation method for distribution network closure and loop switching power supply. Background technique [0002] With the rapid development of the economy, the requirements for the reliability of power supply are getting higher and higher. The hand-in-hand two-way power supply method in the distribution network improves the reliability of power supply in the form of grid structure, but the traditional power failure to power supply still has short-term power failure. , breaking the continuity of power supply, and switching power supply without power outage has become an effective way to improve the reliability of power supply. Improper loop closing operation will generate excessive loop closing current, resulting in tripping of the protection action and expanding the blackout area. The existing distribution network non-stop power supply technology is not c...

AI Technical Summary

Problems solved by technology

Improper loop closing operation will generate excessive loop closing current, resulting in tripping of the protection action and expanding the blackout area

The existing distribution network non-stop power supply technology is not complete, generally requires complex modeling and simulation verification, and different operating conditions often require different verification, or add more equipment to obtain measurement data at loop closure points, or perform complex power flow calculations

Moreover, the power flow in the loop changes before and after the loop is closed, and it is difficult to directly calculate the size of the circulation with a simple formula, which cannot accurately reflect the real-time changing operating conditions

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