Transmission and distribution cooperative reactive power optimization method and system in consideration of static voltage safety constraint

Abstract

The disclosure provides a transmission and distribution cooperative reactive power optimization method and system in consideration of static voltage safety constraint. The method comprises the steps of obtaining the static voltage stability margins of the load nodes in transmission and distribution networks based on Thevenin equivalent parameter identification; establishing an approximate linear mapping relationship between the static voltage stability margins and regulation quantities by using a perturbation method; and in consideration of the real-time requirement of online reactive power optimization, introducing the static voltage stability margin constraint of the weak nodes. A simulation result shows that by introducing the static voltage safety constraint into the reactive power optimization model, the optimization result not only reduce the network loss, but also increase the voltage stability margins of the weak nodes, which makes the grid control economical and safe.

Description

technical field [0001] The present disclosure relates to related technical fields, and specifically relates to a transmission and distribution cooperative reactive power optimization method and system considering static voltage safety constraints. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Whether the distribution of reactive power in the power system is reasonable or not directly affects the safety and stability of the power system, and is directly linked to economic benefits. Insufficient reactive power will reduce the system voltage, the electrical equipment cannot be fully utilized, and even cause a series of accidents such as voltage collapse. Excessive reactive power will also deteriorate the system voltage and endanger the safety of the system and equipment. Waste unnecessary investment. Reasonable reactive power allocation...

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Problems solved by technology

[0005] In the conventional reactive power optimization model, the objective function is generally to minimize the network loss, and only the constraints on the voltage amplitude are added to the constraint conditions. After the reactive power optimization model is solved, individual bus voltages after optimization will appear close to the limit of the qualified range. The safety level of some busbar voltage drops

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