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Method and device for suppressing continuous commutation failure in parallel hybrid DC system

A hybrid DC and commutation failure technology, applied in the field of power transmission and distribution, can solve the problems of poor reliability and stability of the parallel hybrid DC system

Active Publication Date: 2020-10-20
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the continuous commutation failure of the parallel hybrid DC system after a fault, the reliability and stability of the parallel hybrid DC system are poor.

Method used

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  • Method and device for suppressing continuous commutation failure in parallel hybrid DC system
  • Method and device for suppressing continuous commutation failure in parallel hybrid DC system
  • Method and device for suppressing continuous commutation failure in parallel hybrid DC system

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Embodiment Construction

[0047] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] combine figure 1 with image 3 As shown, a preferred embodiment of the present invention is a method for suppressing continuous commutation failures in a parallel hybrid DC system. The parallel hybrid DC system includes a parallel conventional DC unit and a flexible DC unit, and the conventional DC unit and the flexible DC unit The DC units share the commutation bus of the same AC system; the method for suppressing the continuous commutation failure of the parallel hybrid DC system is configured on the inverter side of the parallel hybrid DC system, and the suppression of the continuous commutation failure of the parallel hybrid DC system The methods include:

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Abstract

The invention relates to the technical field of power transmission and distribution, and discloses a method and a device for restraining a continuous commutation failure of a parallel hybrid direct current system. The method comprises the following steps of computing a harmonic voltage compensation component according to a detected three-phase voltage of converter bus at an inverter side of a conventional direct current unit; after the harmonic voltage compensation component is computed, determining a compensation moment of the harmonic voltage compensation component; after the compensation moment of the harmonic voltage compensation component is determined, computing a reactive power compensation value according to the harmonic voltage compensation component; and compensating the reactivepower compensation value to a reactive power outer loop controller at the inverter side of a flexible DC unit. According to the method and the device, the continuous commutation failure of the parallel hybrid direct current system after failure can be effectively restrained. Therefore, reliability and stability of operation of the parallel hybrid direct current system are enhanced.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method and device for suppressing continuous commutation failure in a parallel hybrid DC system. Background technique [0002] The conventional DC transmission technology based on the current source converter has been widely used in the field of power transmission and distribution technology due to its characteristics of long transmission distance, large transmission capacity, and fast and controllable transmission power. However, because the conventional DC transmission technology uses a semi-controlled device-thyristor, there is a risk of commutation failure during the operation of the conventional DC transmission system, and a large amount of reactive power needs to be consumed. [0003] In recent years, the flexible DC transmission technology based on the voltage source converter has been developed rapidly. Since this technology uses fully contro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 郭琦李成翔廖梦君夏成军梁钰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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