Dynamic phasor modeling method for current converter of high-voltage direct-current transmission system

A dynamic phasor, power transmission system technology, applied in the field of power system, can solve problems such as the failure to reflect the real dynamic characteristics of the converter under AC asymmetric faults

Inactive Publication Date: 2009-11-11
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Therefore, the switching function with constant waveform will not be able to refl

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  • Dynamic phasor modeling method for current converter of high-voltage direct-current transmission system
  • Dynamic phasor modeling method for current converter of high-voltage direct-current transmission system
  • Dynamic phasor modeling method for current converter of high-voltage direct-current transmission system

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[0089] Hereinafter, the present invention will be further described in detail with reference to the examples and drawings, but the implementation of the present invention is not limited thereto.

[0090] The structure of the converter in the HVDC transmission system of the present invention is as follows figure 1 As shown, take the data window W 1 The length is 20 milliseconds, get W 1 Sampling values ​​of the AC side a, b and c phase voltages and DC side current of the converter in:

[0091] {u a [n]} 1≤n≤N =[u a1 , U a2 , U a3 ,..., u aN ];

[0092] {u b [n]} 1≤n≤N =[u b1 , U b2 , U b3 ,..., u bN ];

[0093] {u c [n]} 1≤n≤N =[u c1 , U c2 , U c3 ,..., u cN ];

[0094] {i d [n]} 1≤n≤N =[i d1 , I d2 , I d3 ,..., i dN ];

[0095] (The subscripts 1, 2, 3,..., N indicate each sampling point within 20 milliseconds, corresponding to a sampling frequency of 2kHz, N=0.02×2000=40);

[0096] For discrete sequence of N points {x[l]]} 1≤l≤N , x ...

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Abstract

The invention discloses a dynamic phasor modeling method for a current converter of a high-voltage direct-current transmission system, which is applicable to various operating conditions and fault conditions. The method comprises: calculating the actual trigger angle, the actual phase conversion angle and the actual delay flow angle of various converter valves in the current converter according to first dynamic phasor and direct-current zero-order dynamic phasor of the voltage between phases of a converter bus; calculating the three-phase voltage switch function and the three-phase current switch function according to the actual trigger angle, the actual phase conversion angle and the actual delay flow angle of the various converter valves; and establishing a dynamic phasor model according to the three-phase voltage switch function and the three-phase current switch function. The method can realize the establishment of the dynamic phasor model of the current converter under various operating conditions and fault conditions of AC, reduces the calculation amount, has the precision capable of meeting the requirement of engineering application, and can be applied to simulation analysis of dynamic characteristics of an AC system in an AC and DC compound system under various normal operating conditions and fault conditions.

Description

technical field [0001] The present invention relates to a converter modeling method in the field of electric power system, and specifically refers to a dynamic characteristic analysis method of a converter in a high-voltage direct current transmission system applicable to various operating conditions and faults. Phasor Modeling Methods. Background technique [0002] HVDC transmission technology has been widely used at home and abroad for its advantages in long-distance large-capacity transmission. As of 2008, 9 DC transmission projects have been put into operation in my country, and more than 20 DC transmission projects are under planning. my country is gradually forming the world's largest hybrid power grid with multi-infeed DC transmission system, so it is necessary to accurately model the system to study its dynamic characteristics. [0003] In HVDC transmission systems, the converter is a typical discrete switching element. For large-scale AC / DC hybrid power grids, du...

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Application Information

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IPC IPC(8): H02J1/00G06F17/50
Inventor 王钢李志铿李海锋朱革兰
Owner SOUTH CHINA UNIV OF TECH
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