An optimization method for active distribution network transfer considering closed loop current constraints

Abstract

The invention relates to the field of electric power technology, in particular to an active distribution network transfer optimization method considering loop closure current constraints. The distribution network transfer optimization model is established with active power balance constraints, substation transfer capacity constraints, line current carrying capacity and radiation network constraints as constraints, and the second objective function is established with the goal of minimizing the output deviation of DG auxiliary regulation. The objective function is to establish the loop closure constraint verification and the DG output regulation optimization model under the conditions of the closed loop steady state and transient current constraints; through the loop closure constraint verification and the DG output regulation optimization model, the distribution network is transferred to the optimization model The closed loop current constraint of the obtained transfer scheme is verified and adjusted. The model proposed by the invention simultaneously considers the regular operation constraints of the distribution network and the closed-loop steady-state and transient current constraints, thereby improving the reliability of the power supply of the distribution network.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an active distribution network transfer optimization method considering loop closure current constraints. Background technique [0002] my country's distribution network mainly adopts closed-loop design and open-loop operation. During the peak summer (winter) period, the increase in the load of a large number of air conditioners and heat pumps leads to heavy loads and overloads in some substations. In order to reduce the risk of power outages in the system, the dispatching department often uses loop closing operations to transfer loads. The operation of the closed ring network will generate a circulating current, and the inrush current at the moment of closing the ring may cause the protection to malfunction. After the distributed generation (DG) is connected to form an active distribution network, the original radiation structure is changed, and the flexible adjustment ...

AI Technical Summary

Problems solved by technology

[0007] However, none of the existing studies have introduced the closing loop current constraint in the load transfer of the medium-voltage distribution network, and it is impossible to judge whether the transfer plan is feasible for non-stop operation

Images