Alternating-current and direct-current hybrid power grid model system, modeling method of converter thereof and terminal

Abstract

The invention provides an AC-DC (alternating-current and direct-current) hybrid power grid model system, a modeling method of a converter of the AC-DC hybrid power grid model system and a terminal. The AC-DC hybrid power grid model system comprises an AC subsystem, a DC subsystem and a converter VSC connected between the AC subsystem and the DC subsystem. According to the classification principlewhether the control information of the converter VSCs is uploaded to a local dispatching center or not, converter VSCs with the known control information are called observable VSCs, and converter VSCswith unknown control information are called inobservable VSCs; and pseudo measurement equations of the observable VSC and the non-observable VSC based on the control information and the Gaussian mixture model are modeled. The invention does not depend on measurement configuration and the communication process between the dispatching center and the VSCs, has good practicability and robustness, andcan be extended to the state estimation of a three-phase unbalanced AC / DC power distribution network in the future.

Description

technical field [0001] The invention relates to the technical field of distribution network state evaluation, in particular to an AC / DC hybrid network model system and a modeling method and terminal for a converter thereof. Background technique [0002] With the access of DC sources and loads and the development of flexible DC power electronic equipment, the AC-DC hybrid power grid with a variety of distributed generation (Distributed Generation, DG) is considered to be the mainstream architecture of the future distribution network. The operation brings more flexibility, but also exacerbates the difficulty of system state estimation and the lack of measurement data. [0003] The current mature AC state estimation does not take into account the characteristics of the DC system state quantity and quantity measurement and the uncertainty of various DG outputs, and usually assumes that the converter control method is known, and the pseudo-quantity when the converter control meth...

AI Technical Summary

Problems solved by technology

However, these two VSC models still assume that the converter control method is known, and no suggestions are made for the pseudo-measurement modeling when the converter control method is unknown

[0009] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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