Modeling method for island-division mixed integer programming model for active power distribution network

Abstract

The invention discloses a modeling method for an island-division mixed integer programming model for an active power distribution network. The modeling method comprises the steps of establishing a target function of the island-division mixed integer programming model for the active power distribution network; establishing a branch current power flow constraint by taking a current real part and a current imaginary part as state variables, establishing a network topology reconstruction model, establishing a separation constraint model of the load switching state by dual-linear constraint and node injection current, and linearizing the quadratic component of the line current and the node voltage by a special order set 2; establishing a linearized power characteristic equation of a voltage-source inverter access type DG; establishing a linearized power characteristic equation of a doubly-fed induction-based wind generator; establishing a linearized power characteristic equation of a synchronous generator; and assembling the island-division mixed integer programming model for the active power distribution network by combination with the existing linearized constraint of the active power distribution network, and solving the island-division mixed integer programming model. The modeling method is capable of effectively lowering the solving complexity of the island-division of the power distribution network, and has the characteristics of high solving precision, high fitness, high engineering actual conformity, and the like.

Description

technical field [0001] The invention relates to a modeling method for an active distribution network island division model, in particular to a modeling method for an active distribution network island division mixed integer programming model. Background technique [0002] Distributed Generation (DG) has the advantages of flexible power generation and environmental friendliness, and is increasingly connected to the distribution network. DG can supply power to loads nearby to form an independent and autonomous power system, that is, an isolated island. A reasonable island operation mode can effectively leverage the advantages of DG, improve power supply reliability and quality, and has received widespread attention from the industry. As a DG access point, the power distribution system is not only an important link that directly affects the reliability and quality of power supply for users, but also the realization of flexible and interactive intelligent power consumption. Its...

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Problems solved by technology

Reactive power balance is an important factor restricting the feasibility and safety of isolated islands, and DG plays an important role in ensuring reactive power balance in active distribution networks. However, the above-mentioned island division models and methods have common limitations: they ignore the power output characteristics of DG itself , if the active and reactive powers respectively satisfy the interval constraint, that is, the DG power characteristic is a box constraint, this will cause the island operating point to exceed the P-Q power limit of the DG, thereby overestimating the island power supply capability and deviating from the engineering reality; 2) DG power Output has nothing to do with voltage, while DG power output in engineering is a function of voltage, adjust DG output and node voltage according to load demand

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