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Commutation failure suppression method and system based on current change rate

A technology of current change rate and commutation failure, applied in the field of power transmission and distribution, can solve the problems of flexible DC without communication exchange and lack of coordinated control of flexible DC

Active Publication Date: 2017-05-24
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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Problems solved by technology

At present, the hybrid double-infeed DC transmission system in the prior art is similar to the hybrid back-to-back DC system. Electrical distance, there is no communication exchange between flexible DC and conventional DC
Therefore, the existing technology lacks a technical solution for coordinated control between flexible DC and conventional DC to reduce the probability of commutation failure in conventional DC

Method used

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  • Commutation failure suppression method and system based on current change rate

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0022] see figure 1 , is a schematic structural diagram of the hybrid back-to-back DC system applied in the present invention, a method for suppressing commutation failure based on the rate of current change, which is applied to a back-to-back DC power transmission system in which flexible DC and conventional DC operate in parallel, and the flexible DC unit and the conventional DC The units are located in the same converter station, and both share the same converter bus of the AC system, see figure 2 , the method includes the steps of:

[0023] Step 1. Deriving the DC current measured in the conventional DC unit control system with respect to time, and multiplying it by the additional power c...

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Abstract

The invention discloses a commutation failure suppression method and a system based on the current change rate. The method comprises the steps of subjecting the DC current obtained by the measurement of a conventional DC unit control system to derivation, and multiplying the DC current by an additional power coefficient to obtain the additional power of a flexible DC unit; subtracting the additional power of the flexible DC unit from an active power reference value originally input for the active power outer-loop control of the flexible DC unit so as to obtain a new active power reference value for the flexible DC unit; adopting the new active power reference value as an input for the active power outer-loop control of the flexible DC unit; and finally controlling the active power of the flexible DC unit. According to the technical scheme of the commutation failure suppression method and the system based on the current change rate, when the DC current of a conventional DC unit increases rapidly, the active power of the flexible DC transmission is reduced. Meanwhile, the short-circuit ratio of the system is increased, namely the strength of the AC system is enhanced. Therefore, the occurrence probability of conventional DC commutation failures is reduced.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a commutation failure suppression method and system based on a current change rate. Background technique [0002] The traditional current-source grid commutated HVDC (Line Commutated Converter High Voltage Direct Current, LCC-HVDC) has been widely used in my country, and has the characteristics of large transmission power and long transmission distance, but there is a risk of commutation failure. Consumption of a large amount of reactive power and other limitations. In recent years, the Voltage Source Converter based High Voltage Direct Current (VSC-HVDC) based on full-control devices has developed rapidly, with independent decoupling control of active and reactive power and continuously adjustable reactive power. However, there are also problems such as high cost and relatively small transmission capacity compared with traditional DC transmission syst...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 王振郭春义赵成勇蒋碧松
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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