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Constant arc-extinguishing area control method of direct-current power transmission control system

A technology of DC transmission control and control method, which is applied in the direction of power transmission AC network, etc., and can solve problems such as commutation failure of converter valves

Inactive Publication Date: 2015-01-21
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the constant arc-extinguishing area of ​​a DC transmission control system, which is used to solve the problem of commutation failure of the converter valve when the disturbance voltage drops on the AC grid side of the inverter station

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[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] figure 1 Middle U ac , I d , I ac They are AC side voltage, DC side current and AC side current respectively.

[0016] figure 2 Middle U a , U b , U c U is the minimum value of the three-phase AC voltage, U N is the rated AC voltage amplitude of the converter network side of the inverter station, γ refN is the reference value of rated arc extinguishing angle, γ ref is the reference value of arc-extinguishing angle, and α is the firing angle.

[0017] In order to distinguish it from the existing predictive arc extinguishing angle control method, the present invention is named as the constant arc extinguishing area control method of arc extinguishing angle. The area of ​​the integral region between zero crossing point (commutation voltage changes from positive to negative). The reactive power control module calculates the reference value of ...

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Abstract

The invention relates to a constant arc-extinguishing area control method of a direct-current power transmission control system. The method includes the following steps: 1), calculating a rated arc-extinguishing angle reference value of the system; 2), adopting a constant arc-extinguishing area algorithm to calculate current alternating-current voltage and an arc-extinguishing angle reference value corresponding to the rated arc-extinguishing angle reference value of the system; 3), calculating a triggering angle needed by a converter valve according to the arc-extinguishing angle reference angle to control the converter valve of an inverter station, wherein U refers to the minimum value in three-phase alternating-current voltage amplitude values on an inverter station converter net side, UN refers to a rated alternating-current voltage amplitude value on the inverter station converter net side, gamma refN refers to the rated arc-extinguishing angle reference value, and gamma ref refers to the arc-extinguishing angle reference value. By applying the method, when alternating-current voltage decreases caused by the fact that the inverter station is in alternating-current fault, the actual arc-extinguishing angle can be increased according to actual conditions, probability of phase commutation failure can be lowered, and stability of the system can be improved.

Description

technical field [0001] The invention relates to a method for controlling the constant arc extinguishing area of ​​a direct current transmission control system. Background technique [0002] At present, domestic HVDC transmission projects and UHVDC transmission projects are both two-terminal DC systems. The sending end converts AC power into DC power, which is called a rectifier station; the receiving end converts DC power into AC power, called an inverter station. Energy is transferred from the rectifier station to the inverter station. Thyristors are used as converter components in high-voltage direct current transmission projects and UHV direct current transmission projects. The thyristor is a semi-controlled device, which is turned on by triggering the gate under the forward voltage drop; the current flowing through the thyristor is lower than the threshold current and turned off by the action of the external circuit. The topological structure of the converters in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 李少华彭忠李泰荆雪记苏匀赵静吴刚焦坡吴战伟
Owner STATE GRID CORP OF CHINA
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