Splitting surface pre-screening method and splitting surface pre-screening system applied to alternating-current/direct-current system

An AC/DC system and pre-screening technology, applied in the field of power system, can solve problems such as inability to cope with power system emergencies, low computing efficiency, and failure to consider splitting control, etc.
CN106446471AActive Publication Date: 2017-02-22POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
Publication Date
2017-02-22

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Abstract

The invention discloses a splitting surface pre-screening method and a splitting surface pre-screening system applied to an alternating-current / direct-current system. The splitting surface pre-screening method includes simulating asymmetrical faults in three-phase voltage of a bus bar i; acquiring three-phase asymmetric indexes of all bus bars; constructing a correlation matrix according to the three-phase asymmetric indexes of all the bus bars; subjecting the correlation matrix to K-core decomposition so as to obtain a K-core value of each bus bar; screening out the bus bar with the maximum degree of influence on the alternating-current / direct-current system according to the K-core value of each bus bar; deleting the bus bar with the maximum degree of influence on the alternating-current / direct-current system from a splitting surface composed of multiple lines, and splitting the alternating-current / direct-current system according to the splitting surface. The splitting surface pre-screening method and the splitting surface pre-screening system applied to the alternating-current / direct-current system have the advantages that on one hand, stability of the alternating-current / direct-current system subjected to splitting control is guaranteed, and on the other hand, the size of a splitting surface search space is decreased, so that operation time is saved and operation efficiency is improved.
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Description

technical field

[0001] The invention relates to the field of electric power systems, in particular to a method and system for pre-screening split section sections applied to AC and DC systems. Background technique

[0002] In recent years, with the gradual increase in the voltage level of the high-voltage direct current transmission (HVDC) transmission line (±800kV has been built, ±1100kV is under construction), the power of its transmission is also gradually increased. As more and more HVDCs are built and put into production, once serious faults such as continuous commutation failure and single- and double-pole locking occur, it will have a great impact on the stable operation of the power system. As the last of the three lines of defense in the power system, decoupling control protects the power system as much as possible and avoids large-scale blackouts by dividing the large power system into several synchronous subsystems, or cutting off the unstable parts of the system....

Claims

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