Reclosing method of DC circuit breakers in flexible DC transmission systems
A DC circuit breaker, flexible DC technology, used in circuit devices, emergency protection circuit devices, automatic disconnection emergency protection devices, etc.
Active Publication Date: 2020-11-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Most of the existing fault protection schemes based on DC circuit breakers are about how to quickly remove the fault, but there are few studies on the reclosing scheme after the fault. Faults of different natures, an improved overall protection scheme is proposed
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[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0017] An embodiment of the present invention provides a method for reclosing a DC circuit breaker in a flexible DC transmission system, which is characterized in that it includes:
[0018] Step 1. For different types of faults in the flexible DC transmission system, analyze the fault characteristics of the DC circuit breaker when it coincides with transient and permanent faults.
[0019] Overhead lines are used for power transmission in flexible d...
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The invention discloses a re-closing method of a DC circuit breaker in a flexible DC transmission system, which comprises the steps of analyzing fault characteristics of the DC circuit breaker when reclosing in instantaneous and permanent faults in view of faults with different natures in the flexible DC transmission system; and achieving the re-closing of the DC circuit breaker through adopting amode of conducting a transfer branch and switching a control strategy of converter stations at two ends of the faulty line after line fault de-ionization by using switching characteristics of the transfer branch of the DC circuit breaker based on the analyzed fault characteristics. The method can reduce the oscillation of the DC circuit breaker when re-closing in the case of an instantaneous fault and the secondary overcurrent impact thereof when reclosing in the case of a permanent fault, thereby ensuring the safe and stable operation of the system.
Description
technical field [0001] The invention relates to the technical field of control and protection of a flexible direct current transmission system, in particular to a method for reclosing a direct current circuit breaker in a flexible direct current transmission system. Background technique [0002] Compared with traditional DC transmission, flexible DC transmission has the advantage that there are no problems such as reactive power compensation and commutation failure. At the same time, because its current can flow in both directions, it is suitable for forming a multi-terminal DC system. However, considering the transmission distance, voltage level and the resulting cost issues, overhead line transmission is the main way of large-scale power transmission in my country in the future, so it is of great significance to study the fault protection related technologies of flexible direct current transmission systems using overhead lines . The main problem brought by the application ...
Claims
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IPC IPC(8): H02H7/26H02H3/087H02H3/06H02J3/36
CPCH02H3/063H02H3/087H02H7/268H02J3/36Y02E60/60
Inventor 贾科赵冠琨毕天姝陈金锋杨彬王聪博朱瑞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)