Distribution network self-healing optimization method considering both safety and economy

Abstract

The invention discloses a distribution network self-healing optimization method considering both safety and economy, which is applied to a distribution network comprising distributed generation and isoptimized by adopting a double-layer planning model. The double-layer planning model comprises an upper-layer optimization model and a lower-layer optimization model, wherein the upper-layer optimization model takes the highest safety index as an objective function, and the lower-layer optimization model takes the lowest power supply recovery cost as an objective function; and the double-layer planning model takes an on-off operation mode of a tie line switch in the distribution network during a fault as a decision variable. According to the invention, the distribution network self-healing double-layer optimization model based on the safety and the power supply recovery economy of the distribution network is established in allusion to the optimization problem of a self-healing scheme after a large-area power failure of the distribution network, so that an obtained result not only can meet the expectation of an upper-layer decision maker on safety but also can meet the requirement of alower-layer decision maker on economy, and effective compromise and consideration of benefits of the upper-layer decision maker and the lower-layer decision maker are realized.

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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