Method for simplifying passive electromagnetic transient-state simulation model of large-scale power distribution network

Abstract

A method for simplifying a passive electromagnetic transient-state simulation model of the large-scale power distribution network includes steps of dividing a large-scale intelligent power distribution system into an external system and a research system which are connected; respectively establishing an electromagnetic transient-state simulation model of the external system and the research system; setting a low-dimension system model order q; calculating A=-G<-1>C, R=G<-1>B according to a state-output equation model of the external system; selecting a corresponding basis calculating method according to the number of input quantity of the external system, solving a standard orthogonal basis V of Kq(A, R, q) of a krylov subspace of the q dimension; calculating Cq=VTCV, Gq=VTGC, Bq=VTB, Lq=VTL to obtain a low-dimension simplified system model, utilizing a simplified reduced-order model of the external system to substitute for an original external system model, and simultaneously subjecting a detailed model of the research system to simulation calculation to obtain an internal detailed transient process of the research system. The method for simplifying the passive electromagnetic transient-state simulation model of the large-scale power distribution network has the advantages of high accuracy, good stability, simplicity in algorithm and proneness to realizing.

Description

Technical field [0001] The invention relates to a simulation model simplification method. In particular, it relates to a method for simplification of electromagnetic transient simulation model of large-scale distribution network that retains passiveness, which is suitable for various intelligent distribution network electromagnetic transient simulation applications including distributed power sources, microgrids and energy storage devices. Background technique [0002] In modern times, electric energy has been one of the most effective ways of energy utilization. With the continuous growth of human economic and social development’s demand for energy and the increasingly prominent environmental problems, traditional centralized power generation methods dominated by fossil fuels are being challenged, and distributed power generation technologies that can make full use of various new energy sources are being increasingly The wider the attention and application. Distributed power g...

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Problems solved by technology

At present, although there are many linear system dimensionality reduction and simplification methods that can be applied to the simplification of large-scale distribution network models, the traditional simplification methods cannot be guaranteed because of the inability to guarantee the passivity and stability of the simplified models obtained. The reliability and scope of application, the actual application effect is relatively limited

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