A method and system for selecting a filter in a direct current transmission system

A technology of DC transmission system and DC filter, which can be applied to DC circuits to reduce harmonics/ripples, AC network circuits, circuit devices, etc., can solve problems such as unintuitive, difficult to calculate accurately, difficult to cover by analytical algorithms, etc., to achieve The method is simple and intuitive to calculate the effect

Active Publication Date: 2021-03-05
STATE GRID CORP OF CHINA +4
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  • Abstract
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Problems solved by technology

However, this approach is not intuitive, and theoretical calculations often involve many approximations
There are often too many variables in the actual system, which makes it difficult for the analysis algorithm to cover, and most of these variables are time variables, which are difficult to calculate accurately

Method used

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  • A method and system for selecting a filter in a direct current transmission system
  • A method and system for selecting a filter in a direct current transmission system
  • A method and system for selecting a filter in a direct current transmission system

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0023] During the opening and closing process of the converter valve, the voltage will change abruptly. These sudden changes contain a large number of high-frequency components, and these high-frequency components will cause voltage oscillation through the broadband circuit of the converter valve body itself. A series of transient electromagnetic disturbances generated during the opening and closing process of the converter valve will propagate along the circuit, and enter sensitive equipment such as control circuit boards through direct or coupled electrical connections, resulting in electromagnetic disturbances. For this reason, adding DC filter and high-frequency fil...

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Abstract

The invention relates to a method and system for selecting a filter in a direct current transmission system, which is characterized in that it includes the following content: 1) select a direct current filter and a high frequency filter, and add the selected filter to the direct current transmission system 2) The time-domain waveform of the voltage at both ends of each bridge arm of each converter valve in the broadband simulation model in the process of opening and closing when the filter is added or not added through the simulation, and the AC and DC The voltage time-domain waveform and current time-domain waveform on the incoming and outgoing line side; 3) The voltage frequency-domain waveforms at both ends of the bridge arm in the broadband simulation model and the AC and DC incoming and outgoing line side of the converter valve are respectively obtained when the selected filter is added and not added. Terminal frequency domain load; 4) calculate the value of the space electromagnetic field in the direct current transmission system at each frequency when adding and not adding the selected filter; 5) select the filter in the direct current transmission system, and the present invention can be widely used in high voltage direct current in the field of power transmission technology.

Description

technical field [0001] The invention relates to a method and system for selecting a filter in a direct current transmission system, and belongs to the technical field of high voltage direct current transmission. Background technique [0002] The UHV DC transmission system is bipolar operation, and a converter station is established for each pole, and the converter station includes a high-voltage valve hall, a low-voltage valve hall and other equipment. The converter station is the core of HVDC transmission and the center of AC-DC power conversion. A converter station is a complex electrical network composed of various electrical equipment connected to each other, and its operating status directly affects the safety and stability of the entire DC transmission system. The converter valve equipment is turned on and off 12 times in a power frequency cycle. This rapid and continuous electromagnetic disturbance is the main source of disturbance in the electromagnetic disturbance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/02H02J3/36
CPCH02J1/02H02J3/36H02J2003/365H02J2203/20Y02E60/60
Inventor 胡秋玲王帅卿季一鸣胡学彬张涛张磊陈东乐波杨一鸣杨鹏程闫鑫吴方劼王晓民申笑林王超郝致远杜商安王尧玄张和王玲
Owner STATE GRID CORP OF CHINA
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