AC filter considered machine set action coefficient determining method

Abstract

The invention proposes an AC filter considered machine set action coefficient determining method, which belongs to the field of fault analysis of a generator. Considering that in a traditional method for analyzing the action coefficient of a machine set, the influence of the AC filter on the circuit is neglected, the invention is based on the analysis of the secondary synchronous oscillation to determine the action coefficient of the machine set and introduces a double-tuned wave AC filter to the system, which includes: adding a multi-tuned AC harmonic filter to the rectifying side in a high-voltage DC converter system; considering the influence of the multi-tuned AC harmonic filter on the capacity reactive power compensation of a DC transmission system; through the short circuit calculation, obtaining the new three-phase short-circuit current across the AC bus between a DC transmission rectifier station and the generator set; and improving the method for calculating the three-phase short circuit capacity of the DC transmission rectifier station's AC bus so as to further improve the method for determining the action coefficient of the machine set and to increase the measurement precision for action coefficient of the machine set. The method is very reliable, and in the practicing process of the method, the risks of secondary synchronous oscillation can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of failure analysis of generating sets, and particularly designs a method for determining the action coefficient of a generating set considering an AC filter based on subsynchronous oscillation analysis. Background technique [0002] At present, my country is building a 10 million-kilowatt wind power base, and large-scale wind power delivery is inevitable. As an important way of large-scale wind power transmission, the UHV AC power transmission and HVDC power transmission with series compensation capacitors may induce subsynchronous oscillation problems. Therefore, it is of great significance to study the mechanism of subsynchronous oscillation for large-scale wind power transmission. With its advanced technology and economic advantages, HVDC transmission has been widely used in power system transmission, and is playing an important role in my country's West-to-East Power Transmission Project. However, peo...

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for determining the unit action coefficient based on the synchronous vibration square analysis, consider the influence of the AC filter on the circuit, improve the traditional unit action coefficient calculation method, and improve the calculation method of its parameters. In order to solve the reactive power compensation effect of the AC filter on the line in the prior art, and improve the calculation accuracy

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