Parameter designing method for smoothing reactor used for flexible direct-current power transmission

A flexible DC transmission, smoothing reactor technology, applied in the direction of measuring resistance/reactance/impedance, instruments, measuring electricity, etc., can solve the problems of intermittent current waveform, induced noise and so on

Active Publication Date: 2015-03-25
CHINA EPRI ELECTRIC POWER ENG CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following two issues need to be considered: ①The ripple induces noise on the parallel communication line of the DC line, especially the electromagnetic induction of the current ripple. If necessary, a DC filter needs to be added; ②When the current is small, the current waveform is intermittent.

Method used

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  • Parameter designing method for smoothing reactor used for flexible direct-current power transmission
  • Parameter designing method for smoothing reactor used for flexible direct-current power transmission
  • Parameter designing method for smoothing reactor used for flexible direct-current power transmission

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Embodiment Construction

[0045] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] The smoothing reactor is one of the important equipment of the flexible DC transmission converter station. Its main functions in the flexible DC converter station are as follows:

[0047] 1. Limit the rising rate of fault current;

[0048] 2. Prevent the shock wave generated by the DC line or the DC field from entering the valve hall, so that the converter valve is not damaged by overvoltage stress;

[0049] 3. Smooth the ripple in the DC current.

[0050] The DC bipolar short-circuit fault is one of the most serious faults in the flexible DC transmission system. When a DC bipolar short-circuit fault occurs, the fault current develops rapidly, the fault current value is large, and the equipment is subjected to severe current stress. Bipolar short-circuit faults are often caused by the insulation failure between the two-pole ...

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Abstract

The invention discloses a parameter designing method for a smoothing reactor used for flexible direct-current power transmission. The parameter designing method for a smoothing reactor used for the flexible direct-current power transmission comprises the following steps of: (1) determining input parameters which comprise a bridge arm inductance value Larm, a line inductance value Lline, a submodule capacitance value C0 and the amount n of bridge arm submodules; (2) according to the inhibitory condition of the rate of ascent of fault current, determining the lower limit of the inductance value of the smoothing reactor; (3) according to the condition of the direct-current dynamic response speed, determining the upper limit of the inductance value of the smoothing reactor; and (4) according to the condition for generating resonance, determining a smoothing reacting inductance value. According to the parameter designing method for the smoothing reactor used for the flexible direct-current power transmission, which is disclosed by the invention, system resonance caused by a circuit parameter can be avoided.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission (VSC-HVDC), and particularly relates to a parameter design method of a smoothing reactor for flexible direct current transmission. Background technique [0002] The flexible application performance of flexible DC transmission technology makes it have extremely broad application prospects in the fields of urban grid interconnection, new energy grid connection and passive load power supply. The smoothing reactor is one of the important equipments in the flexible DC converter station, and its parameters directly affect the harmonic characteristics, control response speed and fault suppression capability of the converter system. In the existing literature related to flexible HVDC transmission technology, there is no relevant report on the parameter design method of the smoothing reactor, but in the conventional DC transmission, the design basis of the smoothing reactor mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26G01R31/00
Inventor 季兰兰杨杰王海田李泓志杨越
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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