A full-dimensional distribution network loop closure evaluation method

Abstract

A full-dimensional distribution network loop closure evaluation method includes establishing an analysis model of loop closure operation of a distribution network; calculating the voltage deviation ofeach bus bar before and after loop closure, the setting value of protection current after loop closure and the thermal stability limit value of equipment according to the established loop closure operation analysis model; when the voltage deviation of each bus bar before and after loop closure, the setting value of protection current after loop closure and the thermal stability limit value of equipment meet the requirements of loop closure, allowing loop closure. The transient and steady-state faults are analyzed and checked in the closed-loop state. If the fault can be removed, the closed-loop operation analysis model of distribution network is controllable. The method avoids the instability of the power network caused by loop closure, so as to ensure the interests of users, reduce poweroutage losses, effectively improve the reliability of power supply, and improve the safe and economic operation level of distribution network; at the same time, the efficiency of the switchover operator can be improved.

Description

technical field The invention relates to the field of distribution networks of electric power systems, in particular to a method for loop closure evaluation of a full-dimensional distribution network. Background technique With the progress of power grid construction, the 35kV and 10kV distribution network structure of the power grid has gradually improved, and most areas have realized the ring grid structure. In the normal operation mode, each ring network of the distribution network is in open-loop operation somewhere, and the distribution network load is powered by different main network power sources. The network load is transferred to another power source for power supply. In the past, the "cold switching" method was often used in the power distribution network, that is, the method of power failure switching. This method will interrupt the power supply to users. Depending on the operation method and complexity, the power interruption time varies from a few minutes to ha...

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Problems solved by technology

Relying on manual calculations not only has a heavy workload and low efficiency, but also makes it difficult to fully consider various calculation conditions, and it is difficult to guarantee the accuracy and credibility of the calculation results. Judgments based on operating experience often make mistakes

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