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A coordinated control method to improve the resistance to commutation failure of hybrid DC systems

A technology of coordinated control and commutation failure, applied in the field of power transmission and distribution, can solve the problems of lack of coordinated control means, reduce the probability of commutation failure, and improve the ability to resist commutation failure

Active Publication Date: 2018-09-25
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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Problems solved by technology

In the current hybrid HVDC project, there is a certain electrical distance between conventional HVDC and flexible HVDC converter stations, and the operation of the two is also independent of each other, lacking corresponding coordination and control means

Method used

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  • A coordinated control method to improve the resistance to commutation failure of hybrid DC systems
  • A coordinated control method to improve the resistance to commutation failure of hybrid DC systems

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Embodiment

[0026] The present invention provides a coordinated control method for improving the resistance to commutation failure of a hybrid DC system. The method is configured in the rectification station of the flexible DC transmission unit of the conventional DC and flexible DC parallel operation DC transmission system, through the rectification station of the flexible DC unit control to improve the resistance to commutation failure of conventional DC inverter stations.

[0027] In one embodiment, the structural schematic diagram of the parallel hybrid direct current transmission system is as follows figure 1 shown.

[0028] The hybrid DC transmission system consists of a conventional DC transmission system and a flexible DC transmission system. The rectifiers and inverters of the two DC transmission systems are in the same converter station, and they share the same AC bus. The conventional DC rectifier side adopts constant active power control or constant DC current control, and th...

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Abstract

The invention discloses a coordination control method capable of improving hybrid direct-current system commutation failure resistance. The method is used for a rectifier station of a flexible direct-current transmission system of which an conventional direction current and a flexible direct-current operate in parallel, and commutation failure resistance of a conventional direct-current inverter station is improved by controlling a flexible direct-current rectifier. The method comprises the following steps that 1, a trigger angle coordination control component is additionally added on a reactive power outer-loop controller of a flexible direct-current unit; 2, a failure judgment module judges putting time of a delayed trigger angle coordination controller; 3, the size of amplitude limiting of a reactive current reference value and an active current reference value of an inner-loop current controller of the flexible direct-current unit is determined according to a judgment result of the failure judgment module. According to the coordination control method capable of improving the hybrid direct-current system commutation failure resistance, the commutation failure resistance of a conventional direct-current system inverter station in the parallel hybrid direct-current transmission system can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a coordinated control method for improving the resistance to commutation failure of a parallel hybrid direct current transmission system. Background technique [0002] The traditional Line Commutated Converter High Voltage Direct Current (LCC-HVDC) based on the current source converter has the characteristics of long transmission distance, large transmission capacity, fast and controllable transmission power, etc., and there are many construction projects in the world. , rich operating experience and mature technology. However, because the traditional HVDC transmission system uses semi-controlled devices, there is a risk of commutation failure during operation, and a large amount of reactive power needs to be consumed. In recent years, with the advancement of power electronics technology, the Voltage Source Converter based High Voltage Direct Current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 王振郭春义杨治中赵成勇陈欢国建宝顾保全
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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