Method for establishing electromagnetic transient simulation model of large-scale AC-DC (Alternating Current - Direct Current) power system

Abstract

The invention discloses a method for establishing an electromagnetic transient simulation model of a large-scale AC-DC (Alternating Current - Direct Current) power system. At first, an AC-DC power system network is simplified in an electromechanical transient mode by a power system dynamic equivalence method through the utilization of the electromechanical transient simulation data of the large-scale AC-DC power system; secondly, a conversion correspondence principle of an electromechanical transient element model and an electromagnetic transient element model is provided, so that the electromagnetic transient simulation model is established according to the simplified electromechanical transient simulation model of the AC-DC power system. By the adoption of the method provided by the invention, the electromagnetic transient simulation model can be established directly according to the electromechanical transient simulation data of the large-scale AC-DC power system; moreover, the dynamic characteristics of a prototype system are kept; therefore, an AC system and a DC system can be further studied in terms of detailed interaction, multi-direct-current commutation failure characteristics and recovery characteristics after direct current commutation failure.

Description

technical field [0001] The invention belongs to the technical field of power system simulation, and in particular relates to a method for constructing an electromagnetic transient simulation model of a large-scale AC and DC power system. Background technique [0002] With the rapid development of the national economy, in order to provide safe, reliable and abundant power supply, the power system has been continuously improved and upgraded in recent years. In particular, the successive commissioning of UHV AC and UHV DC projects indicates that my country's power system has developed into a system that includes multiple machines (thousands of machines), large power grids (tens of thousands of lines, busbars), AC-DC hybrid transmission and large-scale power grids. The complex power grid with the characteristics of regional interconnection. Usually, for the unstable factors existing in the power grid, it is necessary to study and analyze the power system simulation and propose a...

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Problems solved by technology

[0005] At present, there is no systematic solution to the problem of how to establish an electromagnetic transient model for large-scale AC and DC power systems

At the same time, the traditional dynamic equivalent method under electromechanical transient simulation, such as homogeneous equivalent method, modal equivalent method and estimated dynamic equivalent method based on parameter identification, will form negative Resistive branch, so it is not suitable for electromagnetic transient simulation analysis

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