Cooperative reactive power optimization method and system for transmission and distribution considering static voltage safety constraints

Abstract

This disclosure proposes a transmission and distribution collaborative reactive power optimization method and system that considers static voltage security constraints. Based on Thevenin equivalent parameter identification, the static voltage stability margins of load nodes in the transmission and distribution networks are respectively obtained, and the The dynamic method establishes an approximate linear mapping relationship between the static voltage stability margin and the control quantity, and considers the real-time requirements of online reactive power optimization, and adds the static voltage stability margin constraints of weak nodes. The simulation results show that by adding static voltage safety constraints to the reactive power optimization model, the optimization results not only reduce the network loss, but also increase the voltage stability margin of weak nodes, so that the power grid regulation is both 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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