Distribution network loop closing current calculating method based on distributed power supply

Abstract

The invention discloses a distribution network loop closing current calculating method based on a distributed power supply. The running state of the distributed power supply is optimized and adjusted by establishing a coordinated optimization model of the distributed power supply and combining a primal-dual interior point method to reduce the loop closing operation current. Load flow distribution of a loop closing circuit is calculated by adopting a two-stage method in a weakly meshed distribution network, so that theoretical support and method reference are provided for smoothly implanting the loop closing operation and improving the power supply reliability in an intelligent power grid environment.

Description

technical field [0001] The invention relates to a calculation method of distribution network closing loop current considering distributed power supply, establishes a coordination optimization model of distributed power supply, uses nonlinear primal-dual interior point method to solve the model, and proposes a two-stage weak loop The distribution network power flow calculation method can effectively calculate the closed-loop current of the distribution network with distributed generation. Background technique [0002] At present, the 10kV power distribution network in my country's urban and suburban areas generally adopts the ring network design and open-loop operation mode. Most 10kV lines have the ability to supply power to each other, and have the basic conditions for non-stop power transfer. The 10kV distribution network loop closing operation is a new measure launched by the power system for power outage management. When the distribution network is overhauled or the sys...

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Problems solved by technology

However, the emergence of DG in the distribution network will bring about various impacts, among which the impact on the loop closing operation is more complicated. The size of the loop closing current is closely related to the type, capacity, and location of the DG. If no quantitative analysis is performed, then It may affect the success rate of loop closing operation, thereby affecting the reliability of power supply. At present, domestic research on the loop closing problem of distribution network has just started, and most of them are post-hoc theoretical analysis after the loop closing problem occurs, and no comprehensive analysis has been formed. A complete set of loop closing operation analysis theory, and a quantitative analysis method for the loop closing current of the distribution network containing DG is lacking. Practical theories and methods in this area are urgently needed to guide practice

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