Power system hybrid simulation fault unified processing method

Abstract

The invention provides a power system hybrid simulation fault unified processing method. The method includes the following steps that: A, in hybrid simulation, a power system alternating current network is established at an electromechanical transient side through utilizing an electromechanical transient super real-time simulation program TH-STBLT; B, at a fault port, the power system alternating current network is divided into a normal sub network and multi-port fault sub networks; C, in the normal sub network, a power grid part is described through adopting a fundamental wave three-sequence network, and primary equipment dynamic elements such as a generator, a dynamic load and a power electronic device are connected into a positive sequence network; and D, in the multi-port fault sub networks, fault models of power system network elements are established according to fault information, and a multi-port and multi-fault complex admittance unified module Yf is derived; E, the Yf is superimposed into an admittance module Y of the positive sequence network of the normal sub network, and positive sequence voltage and positive sequence current of a fault port of the positive sequence network are calculated; and F, the voltage of the fault ports of a negative sequence network and a zero sequence network is calculated through the current of the fault port of the positive sequence network.

Description

technical field [0001] The invention relates to a method for unified processing of hybrid simulation faults of a power system, which belongs to the technical field of digital simulation of AC and DC power grids. Background technique [0002] In order to study and analyze the grid characteristics of the large-scale AC-DC system interaction and ensure the safe and stable operation of the large grid, an accurate and reliable simulation system is an indispensable tool. At present, people have developed an electromagnetic-electromechanical hybrid real-time simulation platform, which realizes the organic combination of electromagnetic and electromechanical transient processes in power systems, and closely couples them together for simultaneous simulation. [0003] For AC grids containing large-capacity power electronic devices, due to the complex commutation process, the analysis of this type of grid faces similar problems and computational analysis requirements as the above-menti...

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Problems solved by technology

[0004] Traditional hybrid simulation electromechanical transient programs deal with three-phase asymmetric conditions and fault disturbances. Most of them only calculate horizontal faults or vertical faults in single-port power grids. There is a lack of unified processing methods, and the calculation efficiency is low. It is difficult to apply in large-scale power grids. Handle multi-port horizontal and vertical complex faults

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