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A control system and method for reducing short-circuit current of a flexible direct current converter station

A control system and short-circuit current technology, applied in the direction of emergency protection circuit devices, circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, can solve short-circuit current and reduce short-circuit current of flexible DC converter stations, etc. Achieve guaranteed operation, good implementation effect, and reduce the effect of short-circuit current level

Active Publication Date: 2022-03-15
YUNNAN POWER GRID
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Problems solved by technology

[0005] This application provides a control system and method for reducing the short-circuit current of a flexible DC converter station to solve the problem of short-circuit current

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  • A control system and method for reducing short-circuit current of a flexible direct current converter station
  • A control system and method for reducing short-circuit current of a flexible direct current converter station
  • A control system and method for reducing short-circuit current of a flexible direct current converter station

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Embodiment Construction

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0042] see figure 2 , is a structural schematic diagram of a control system for reducing the short-circuit current of a flexible DC converter station provided in the embodiment of the present application, as shown in figure 2 As shown, the control system for reducing the short-circuit current of the flexible DC converter station provided b...

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Abstract

The embodiment of the present application provides a control system and method for reducing the short-circuit current of a flexible direct current converter station. The system includes a main control converter station control unit, a cooperative control converter station control unit, and a cooperative control center. Both the master control converter station control unit and the cooperative control converter station control unit include an additional controller and a limiter, and the additional controller is connected to the limiter and the cooperative control center respectively; the additional controller includes a hysteresis control circuit, and the hysteresis The control circuit is used to adjust the limiting set value of the limiter to be equal to the preset low current value when the voltage signal on the grid side of the converter transformer of the main control converter station or the cooperative control converter station is lower than the preset low voltage value, When the voltage signal at the grid side of the converter transformer is higher than the preset high voltage value, the limit setting value of the limiter is adjusted to be equal to the preset current high value. The control system and method for reducing the short-circuit current of a flexible direct current converter station provided by the embodiments of the present application can effectively reduce the short-circuit current and ensure the safe and stable operation of the flexible direct current transmission system.

Description

technical field [0001] The present application relates to the technical field of flexible power transmission and distribution of power systems, and in particular to a control system and method for reducing short-circuit current of a flexible DC converter station. Background technique [0002] Compared with conventional DC transmission technology, flexible DC transmission technology has the advantages of smaller footprint, more flexible control, independent adjustment of active power and reactive power, and no commutation failure problem. With the development of related theoretical research and equipment manufacturing level of flexible direct current technology, the transmission capacity of flexible direct current transmission system is increasing continuously, and the application in my country's power grid is also gradually increasing. [0003] The access of the flexible DC transmission system brings new challenges to the short-circuit current control of the existing AC grid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H9/02
CPCH02H9/02H02J3/36Y02E60/60
Inventor 游广增李玲芳朱欣春
Owner YUNNAN POWER GRID
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