Modeling method for integrated broadband equivalent circuit model for tower valve layer of ultra-high-voltage direct current converter valve

Abstract

The invention belongs to the electromagnetic transient analysis field in an electric power system, and particularly relates to a modeling method for a broadband equivalent model for performing analysis on a tower interlamination transient voltage of an ultra-high-voltage direct current converter valve. The modeling method specifically comprises the steps of taking a valve layer as a unit, and establishing a key component lumped parameter equivalent model in the valve layer and a valve layer terminal capacitor model; enabling the key component lumped parameter equivalent model in the valve layer and the valve layer terminal capacitor model to be connected according to an actual electrical connection condition of the valve tower to obtain the final the broadband equivalent model for performing transient voltage analysis on the tower interlamination of the ultra-high-voltage direct current converter valve. By considering the influence on the valve interlamination voltage distribution from the key component parameters in the valve and shielding cover stray capacitance parameters under a voltage effect, the integrated broadband equivalent circuit model is applicable to perform accurate and efficient analysis on the tower interlamination transient voltage of the ultra-high-voltage direct current converter valve under various kinds of voltages.

Description

technical field [0001] The invention belongs to the field of electromagnetic transient analysis of electric power systems, and in particular relates to a modeling method for an integrated broadband equivalent circuit model of an ultra-high voltage DC converter valve tower valve layer. Background technique [0002] The DC converter valve tower is the core equipment of the DC transmission system. It is composed of many thyristors and related components connected in series. It is affected by the changes of the AC and DC system conditions during operation and will suffer from different types of overvoltage. In order to ensure the safe and stable operation of the DC system, it is necessary to study the voltage distribution characteristics in the converter valve under various overvoltages. The transient voltage between valve tower layers under overvoltage is an important consideration. It is also essential to establish a reasonable broadband model of the converter valve to analyze...

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Problems solved by technology

[0007] 1. The broadband equivalent model of the UHVDC converter valve tower interlayer transient voltage analysis in the prior art is only based on the broadband equivalent model of a single device, without considering the key components in the valve based on the working parameter set of key components The influence of the high frequency characteristics of the

[0008] 2. The traditional parasitic capacitance parameter extraction method used in the existing technology has high time complexity and space complexity, which leads to long modeling and simulation time and low simulation efficiency. The analysis of the transient voltage between valve tower layers caused great inconvenience

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