Sectional type line overload protection control coordination optimization method and system

Abstract

The invention relates to a sectional type line overload protection control coordination optimization method and system, and the method is characterized in that the method comprises the following steps: 1), stripping a power transmission path from each power generation node to each load node in an electric power system network when a line in the electric power system network is overloaded, and determining the power composition of the electric power system network; 2) determining adjustable control resources in the power system network within the limit thermal stable operation time; 3) determining a minimum load loss amount and a control measure for recovering the power of the overload line to a normal operation state range; 4) when the minimum load loss amount is 0, controlling the power generation nodes and the load nodes in the power system network according to the determined control measures; when the minimum load loss amount is not zero, according to the determined adjustable control resources, carrying out segmented coordination optimization on the overload protection device on the overload line and the adjustable control resources in the power system network. The method and the system can be widely applied to the technical field of power grid protection control.

Description

technical field [0001] The invention relates to a coordinated optimization method and system for segmental line overload protection control, and belongs to the technical field of power grid protection control. Background technique [0002] With the construction and development of the power system, the load demand is increasing year by year, and the interconnection degree of the power grid is continuously improving. This puts forward higher requirements for the safe and stable operation of the power system, and also brings unprecedented challenges to the protection and control of the power grid. The insufficient network transmission capacity of the power system or the fault removal of some components may cause the overload of the transmission line in the power system network, and the long-term overload of the line will cause the line to be overheated and damaged, resulting in more serious accidents. [0003] After the transmission power of the line crosses the line, the line ...

AI Technical Summary

Problems solved by technology

[0004] The existing line overload emergency protection control measures only aim to protect electrical equipment. After the line overload operation lasts for a period of time, the overload protection device of the line will directly cut off the overload line. This form of protection does not stand in the perspective of system safety. Defense will likely lead to aggravation of the failure situation and contribute to a wider range of systemic accidents

Existing active power emergency protection control measures generally consider the current thermal stability limit running time of the line, and adopt methods such as sensitivity method and penalty function optimization method to determine the machine and load shedding schemes. However, the existing line overload emergency protection control measures are different from active power emergency Protection and control measures are generally separated from each other, lacking coordination and cooperation

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