A self-healing optimization method for distribution network considering both safety and economy

Abstract

The invention discloses a distribution network self-healing optimization method that takes into account both safety and economy, which is used for a distribution network including distributed power sources, and adopts a two-layer programming model for optimization; the two-layer programming model includes an upper-layer optimization model and an upper-layer optimization model. The lower-level optimization model; the upper-level optimization model takes the highest safety index as the objective function, and the lower-level optimization model takes the lowest power supply restoration cost as the objective function; the two-layer programming model uses the opening and closing operation mode of the tie line switch in the distribution network when a fault occurs as a decision variable. The present invention aims at the optimization of the self-healing scheme after a large-area power failure in the distribution network, and establishes a double-layer optimization model for the self-healing of the distribution network based on the safety of the distribution network and the economy of power supply recovery, so that the obtained results can satisfy the safety requirements of the upper-level decision makers. It can also meet the economic needs of lower-level decision makers, and achieve an effective compromise and balance between the interests of the two.

Description

technical field [0001] The invention relates to a distribution network self-healing optimization method, which belongs to the technical field of power distribution systems. Background technique [0002] With the rapid development of my country's economy, the scale of the power grid is also expanding, and the direct connection between the distribution network and the electricity users plays an important role. When a fault occurs in the distribution network and causes a large-scale power outage, fast restoration of power supply is the primary task of the power grid company. The distribution network self-healing technology is a favorable means to use the intelligent control of the distribution network to quickly isolate faults and restore power supply according to the optimal plan. [0003] The traditional distribution network self-healing model is mostly a single-layer optimization model, which unilaterally considers the safety or economy of distribution network operation, an...

AI Technical Summary

Problems solved by technology

After the distributed power generation is connected to the grid, the distribution network flow will be redistributed, and the node voltage, network loss and power quality in the distribution system will all change.

The advantage of distributed power grid connection is that it can improve the reliability of distribution network power supply. When the distribution network system is out of power in a large area, the existence of distributed power supply provides diversity for the self-healing scheme of the distribution network. The disadvantage is that it may cause node voltage and network loss. And power quality and other indicators exceed the limit

Therefore, the grid-connection of distributed power generation puts forward new requirements for the self-healing optimization of distribution network in terms of safety and economy. The self-healing optimization method of distribution network in the prior art does not consider the impact of distributed The impact caused by the system cannot take into account the needs of safety and economy

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