DC transmission system constant voltage control method

A voltage control method and DC transmission system technology, applied in the direction of converting irreversible AC power input into DC power output, irreversible DC power input into AC power output, power transmission AC network, etc., can solve the problem of weakening the DC power transmission system Flexible control, slow DC voltage response, etc.

Active Publication Date: 2016-04-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Usually, in a DC power transmission system, the DC voltage is controlled by the inverter, and the DC current is controlled by the rectifier; at present, the DC power transmission projects that have been put into operation mostly use the inverter to control the DC voltage with a fixed arc-extinguishing angle control method. Since the arc-extinguishing angle is a c

Method used

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  • DC transmission system constant voltage control method
  • DC transmission system constant voltage control method
  • DC transmission system constant voltage control method

Examples

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Embodiment

[0078] Taking a DC transmission project as an example, the effective value of the AC voltage on the valve side of the converter transformer is 178kV obtained by sampling the voltage transformer on the valve side of the converter transformer in real time, and the DC current obtained by sampling the DC current transformer on the DC bus is 5000A, set the rated value of the DC voltage to 200kV, and the equivalent commutation resistance to 4.65Ω, then the corresponding arc-extinguishing angle of the inverter is obtained according to the set value of the DC voltage:

[0079]

[0080] When the DC current of the DC system changes, ensure that the output voltage and current of the inverter change according to the positive slope, such as image 3 As shown in , to avoid control disorder caused by multiple stable operating points, the slope of the line segment AB in the figure can be specified as required, and the line specifies that the slope of the line segment of this segment is 1. ...

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Abstract

The invention relates to a DC transmission system constant voltage control method. The method comprises steps: according to a DC voltage set value, an AC voltage effective value at an inverter station converter transformer valve side, system DC current and equivalent phase change resistance, an extinction angle of the inverter is determined; a firing angle of the inverter is determined by the extinction angle of the inverter, the output DC voltage of the inverter is thus determined, a method in which a rectifier tracks current changes of the system to properly adjust the firing angle is used for realizing voltage adjustment of the rectifier. The extinction angle of the inverter is determined, and precise control on the DC voltage is ensured; a novel extinction angle-firing angle conversion method is designed, the output voltage and the current of the inverter are ensured to change according to a positive slope relationship, and control disorder due to appearance of multiple stable operation points can be avoided; and the method in which the rectifier tracks current changes of the system to properly adjust the firing angle is used for realizing voltage adjustment of the rectifier, and the DC current can be ensured to be stabilized at the set value.

Description

technical field [0001] The invention relates to a voltage control method, in particular to a constant voltage control method of a direct current transmission system. Background technique [0002] High-voltage direct current transmission has been widely used in the field of electric energy transmission and plays a huge role due to its advantages of large transmission capacity, long transmission distance, and flexible control. The converter that changes from AC to DC is called a rectifier, and the converter that changes the form of electric energy from DC to AC is called an inverter. By adjusting the firing angle of the converter, the DC voltage output by the converter can be adjusted. The rectifier Cooperating with the adjustment of the inverter can realize the flexible control of the DC transmission system. Usually, in a DC power transmission system, the DC voltage is controlled by the inverter, and the DC current is controlled by the rectifier; at present, the DC power tra...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M7/48H02M7/12
CPCY02E60/60
Inventor 张静魏晓光曹均正郭焕
Owner STATE GRID CORP OF CHINA
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