Short circuit protection circuit for flexible direct current transmission system
A short-circuit protection circuit and power transmission system technology, which is applied in the field of short-circuit protection circuits and converter valve level controllers, can solve the hidden dangers of the inability to suppress the rising speed of short-circuit current, the inability to reduce the maximum value and steady-state value of short-circuit current, and the safety of converter valves And other issues
Active Publication Date: 2020-04-03
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology
[0005] The invention provides a short-circuit protection circuit, system, method and converter valve level controller of a flexible direct current transmission system, which are used to solve the problem that the smoothing reactor in the prior art is connected in series on the direct current side, and after the MMC converter valve is locked It has no effect on the short-circuit current, so that when a bipolar short circuit occurs on the DC side of the MMC flexible DC transmission system, since the existing smoothing reactor is connected in series on the DC side, the short circuit cannot be suppressed after the MMC converter valve is locked. The rising speed of the current, as well as the inability to reduce the maximum value and steady-state value of the short-circuit current, make the converter valve a technical problem with potential safety hazards
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[0043] The embodiment of the present invention provides a short-circuit protection circuit, system, device, method and converter valve level controller of a flexible direct current transmission system, which are used to solve the problem that the existing smoothing reactors are connected in series on the direct current side, and the MMC converter valve After the lockout, the rising speed of the short-circuit current cannot be suppressed, and the maximum value and steady-state value of the short-circuit current cannot be reduced, which makes the converter valve have technical problems of potential safety hazards.
[0044] In order to make the purpose, features and advantages of the present invention more obvious and understandable, 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 following The described embodime...
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The invention discloses a short-circuit protection circuit of a flexible DC power transmission system, a system, a method and a converter-valve-level controller; the following technical problems are solves: since a smoothing reactor is connected with a DC side in series in the prior art, the MMC converter valve does not play effect on the short-circuit current after being locked; the rising speed of the short-circuit current cannot be inhibited and the maximum value and the steady-state value of the short-circuit current cannot be lowered after the MMC converter value is locked since existing smoothing reactor is connected with the DC side in series when the bipolar short-circuit occurs at the DC side of the flexible DC power transmission system, and the converter valve has a hidden danger.
Description
technical field [0001] The invention relates to the technical field of electric power protection, in particular to a short-circuit protection circuit, system, method and converter valve stage controller of a flexible direct current transmission system. Background technique [0002] In 2001, German scholar R. Marquardt invented the modular multilevel converter (MMC) topology using half-bridge sub-modules. The bridge arms of this type of topology adopt the form of cascading basic sub-modules to avoid A large number of switching devices are directly connected in series and triggered in unison. [0003] The sub-modules of the half-bridge MMC usually use power electronic devices such as IGBTs. Although these devices can be controlled to turn on and off, they have poor overcurrent capability. In addition, when a short-circuit fault occurs on the DC side of the half-bridge MMC, in addition to the DC capacitor In addition to discharge, the AC system will also provide short-circuit ...
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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 刘正富盛超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID