A Short-Circuit Current Limiting Method Based on Grid Topology Adjustment

Abstract

The invention provides a short-circuit current limiting method based on power grid topological adjustment. The method includes the specific steps that 1, a potential strategy set is constructed; 2, candidate topological adjustment strategies are determined according to comprehensive effectiveness index values; 3, safety analysis is carried out on power grid short-circuit currents and the power grid operating state after the candidate topological adjustment strategies are executed; 4, transmission loss analysis is carried out on the power grid operating state, and a candidate topological adjustment strategy corresponding to the transmission loss minimum value is selected as a target topological adjustment strategy. Compared with the prior art, the short-circuit current limiting method based on the power grid topological adjustment has the advantages that the comprehensive effectiveness index values are adopted to objectively reflect limiting effects of the topological adjustment strategies on the whole network short-circuit currents, effective strategies can be quickly and accurately searched out of numerous potential strategies, safety assessment is conducted on the strategies, and operable topological adjustment strategies are determined.

Description

technical field [0001] The invention relates to a short-circuit current limiting method, in particular to a short-circuit current limiting method based on grid topology adjustment. Background technique [0002] With the increasing scale of my country's power grid, the continuous operation of large-capacity units and the interconnection of power grids in various regions, the level of short-circuit current in the power system is also increasing. The level of short-circuit current in many areas has reached or even exceeded the limit set by the power regulations The maximum allowable value threatens the safe operation of the system. Taking into account the actual situation in our country, it is impossible to carry out large-scale transformation of power equipment and power lines at this stage. How to adjust the existing grid structure, optimize the existing grid structure, and reduce the level of short-circuit current is a relatively urgent practical demand. [0003] The articl...

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Problems solved by technology

However, the establishment of an empirical topology adjustment strategy cannot formulate the optimal strategy from the perspective of the whole system. In addition, there are many decision-making links, and the real-time performance is difficult to be guaranteed.

The article "Structure Adjustment Optimization Algorithm for Limiting Short-Circuit Current of 500kV Power Grid" proposes an optimization algorithm for grid adjustment. It only needs to form the impedance matrix of the concerned nodes at one time, and then quickly obtain the short-circuit current at the point most likely to limit the excess through programming. The network frame adjustment measures avoid the cumbersome process of checking all broken line combinations one by one; however, this algorithm has the disadvantage of only using disconnected lines as an adjustment method, which is poor in practicability

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