Control method and device for suppressing continuous commutation failure of direct current power transmission system
A DC transmission system and transmission system technology, applied in the field of power transmission, can solve the problems of limited active power, unfavorable system power recovery, etc., and achieve the effect of speeding up the response and suppressing the failure of continuous commutation
Pending Publication Date: 2022-03-04
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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[0004] Most of the existing coordinated control strategies for suppressing continuous commutation failure are originally designed to provide reactive power support for the system by greatly increasing the reactive power of flexible HVDC transmission. Although it is helpful to suppress the occurrence of continuous commutation failure, However, this often leads to the limitation of the active power output after the fault is cleared, which is not conducive to the recovery of system power
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0047] see figure 1 , figure 1 It is a system structure diagram of the hybrid direct current transmission system provided by the embodiment of the present invention, which can be regarded as a simplified model obtained by abstracting the actual complex power system.
[0048] figure 2 It is a schematic diagram of a traditional flexible DC transmission vector current control system, which consists of an inner current control loop and an outer power control loop. ...
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According to the control method and device for suppressing the continuous commutation failure of the direct current power transmission system, the extinction angle deviation when the extinction angle margin is insufficient is added to the reactive outer ring of the flexible direct current power transmission system, so that the response speed of the flexible direct current power transmission system during the fault period is accelerated; and through dynamic power amplitude limiting adjustment of the flexible direct-current power transmission system, the capability of rapidly adjusting reactive power of the flexible direct-current power transmission system is fully exerted, reactive power impact on a receiving-end alternating-current system in the fault recovery process of the hybrid multi-infeed direct-current power transmission system is reduced, and continuous commutation failure is inhibited. And meanwhile, the maximum active power can be transmitted by the direct-current system.
Description
technical field [0001] The invention relates to the technical field of power transmission, in particular to a control method and device for suppressing continuous commutation failure of a DC power transmission system. Background technique [0002] With the wide application of DC transmission projects in the fields of large-capacity long-distance transmission and regional grid interconnection, a hybrid multi-infeed DC transmission system has emerged in which multiple conventional DC lines and flexible DC lines are placed on the same AC system. Conventional DC systems use thyristors without self-shutoff capability as commutation components, which may cause commutation failures. However, flexible DC transmission systems have no commutation failures and can achieve active and reactive power decoupling control and provide reactive voltage support. How to use the reactive power and voltage support capability of the flexible HVDC transmission system to improve the fault recovery ch...
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IPC IPC(8): H02J3/36H02J3/18H02J3/16
CPCH02J3/36H02J3/18H02J3/16Y02E40/30Y02E60/60
Inventor 龙霏黄东启王延纬钟明明苗璐夏成军易杨
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD