Power electronic multi-infeed power system key line identification method and system

Abstract

The invention discloses a power electronic multi-infeed power system key line identification method and system. The method comprises the steps that an extended admittance matrix of a power electronic multi-infeed power system is acquired, wherein the information based on which the extended admittance matrix is obtained comprises the feed-in capacity and the grid structure of the power electronic multi-feed-in power system; according to the characteristic value of the extended admittance matrix, the power electronic multi-infeed power system is equivalent to a plurality of power electronic single-infeed power systems with the same small interference stability, wherein the minimum characteristic value of the extended admittance matrix is the generalized short-circuit ratio of the power electronic multi-infeed power system; the characteristic value and the characteristic vector property are combined to obtain the sensitivity of the generalized short-circuit ratio relative to the admittance of each network line; and the key line of the power electronic multi-infeed power system is identified according to the obtained sensitivity sequence. The method can effectively reduce the problem of small interference stability in practical engineering application.

Description

technical field [0001] The invention belongs to the technical field of new energy planning and design, and in particular relates to a method and system for identifying key lines of a power electronic multi-infeed power system. Background technique [0002] With the intensification of the global energy crisis and the increasingly severe environmental protection situation, the proportion of new energy units in the power system is gradually increasing; Regions rich in resources are mostly located in the northwest, far away from the load centers in the east. There is a long-term need for large-scale long-distance transmission of electric energy. The clustering of a high proportion of new energy generating units has become an important trend in future development. Studies have shown that after the new energy units with increasing capacity are connected, the power system presents a significant power electronic characteristic, which is prone to small disturbance stability problems ...

AI Technical Summary

Problems solved by technology

Studies have shown that after the new energy units with increasing capacity are connected, the power system presents a significant power electronic characteristic, which is prone to small disturbance stability problems and poses a great challenge to the safe and stable operation of the system

Images