Method and system for controlling trigger angle of converter valve in direct current transmission system

A direct current transmission system, direct current technology, applied in the direction of output power conversion device, electrical components, power transmission AC network, etc., to achieve the effect of improving stability, ensuring flexibility, and good control characteristics

Active Publication Date: 2019-01-25
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for controlling the firing angle of converter valves in direct current transmission systems, which is used to solve the problem that the traditional control method has defects to a certain extent

Method used

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  • Method and system for controlling trigger angle of converter valve in direct current transmission system
  • Method and system for controlling trigger angle of converter valve in direct current transmission system
  • Method and system for controlling trigger angle of converter valve in direct current transmission system

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Embodiment 1

[0023] The control method for the trigger angle of the converter valve of the direct current transmission system provided by the present invention includes the control of the trigger angle of the converter valve on the inverter side and the converter valve on the rectification side. Adopt constant current control.

[0024] The trigger angle control system of a converter valve in a direct current transmission system provided by the present invention includes an inverter side subsystem and a rectification side subsystem.

[0025] For inverter side subsystems, such as figure 1 As shown, it includes an adder, a firing angle generation module, a maximum value selector, a first PI controller, a predictive arc-extinguishing angle calculation module and a selector, and the adder is connected to an input end of the selector through the firing angle generation module; The output of the predictive arc extinguishing angle calculation module is connected to one input end of the first PI c...

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Abstract

The present invention relates to a control method and a control system of a converter valve trigger angle of a direct current transmission system. Controlling a trigger angle of a converter valve on an inverter side comprises: when a direct current increases or a commutation voltage decreases, and an extinction angle decreases to a set predictive control setting value, applying an extinction angle predictive control policy to the converter valve; and according to the direct current and the commutation voltage, solving the trigger angle of the converter valve of the time when the extinction angle is equal to the predictive control setting value, in order to control the trigger angle of the converter valve. The control manner has an advantage that the predictive control can determine the trigger angle according to a real-time change of a system operation status, and an advantage of the control policy is used to overcome a defect of a traditional control method. Moreover, the control method fully meets requirements of relevant standards, parameters of the control method can be conveniently adjusted, and the control method is good in control performance, thereby increasing the system operation stability and suppressing occurring of commutation failures.

Description

technical field [0001] The invention relates to the control of the trigger angle of a converter valve in a DC power transmission system, and in particular to a control method and a control system for the trigger angle of a converter valve in a DC power transmission system. Background technique [0002] The direct current transmission project is a project that realizes electric energy transmission in the form of direct current. At present, most of the power generation and consumption in the power system are alternating current, and DC power transmission must be commutated. The place where the sending end performs rectification transformation is called a rectification station, and the place where the receiving end performs inversion transformation is called an inverter station. [0003] As the core and key equipment of the converter station, the DC converter valve ensures its safe, reliable and stable operation, which is not only a requirement of the system for the device, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M1/08
CPCY02E60/60
Inventor 刘海斌李延龙张爱玲王柏恒沈开奎常亚威张玉姣闫帅苏匀康婧婧王祺元陈香香张健陈朋
Owner STATE GRID CORP OF CHINA
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