Hybrid converter topological structure with controllable turn-off of alternating current side and control method thereof
A topology and hybrid technology, applied in the field of commutation, can solve problems such as commutation failure affecting the stable and safe operation of the power grid
Pending Publication Date: 2021-04-20
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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Problems solved by technology
[0004] In view of this, the embodiment of the present invention provides a hybrid converter topology with controllable shutdown of the AC side and its control method to solve the problem that commutation failure affects the stable and safe operation of the power grid
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[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0043] As the core equipment of DC power transmission, the converter is the core functional unit to realize the conversion of AC and DC power, and its operation reliability largely determines the operation reliability of the UHV DC grid. However, since traditional converters mostly use semi-controlled device thyristors as the core components to form a si...
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The invention discloses a hybrid converter topological structure with controllable turn-off of an alternating current side and a control method thereof. The topological structure comprises at least one phase of commutation circuit comprising a thyristor valve branch and a first control valve branch or a second control valve branch which are connected in parallel; the thyristor branch is provided with a thyristor valve; the first control valve or second control valve branch comprises a first control valve and a second control valve, and the first control valve and the second control valve both have a forward current controllable turn-off function and a forward and reverse voltage blocking function; the connecting end of the first control valve and the second control valve is connected with the output end of a converter transformer through a third control valve; the third control valve has a one-way voltage output controllable turn-off function; and the connecting end of a series thyristor valve is connected with the output end of the converter transformer. By implementing the invention, the problem of commutation failure of a direct current system is fundamentally solved, so that the stability and safety of power grid operation are ensured.
Description
technical field [0001] The invention relates to the technical field of commutation in power electronics, in particular to a topology structure of a hybrid converter with controllable shutdown of the AC side and a control method thereof. Background technique [0002] The traditional line commutated converter high voltage direct current (LCC-HVDC) transmission system has the advantages of long-distance large-capacity transmission and controllable active power, and is widely used in the world. As the core equipment of DC power transmission, the converter is the core functional unit to realize the conversion of AC and DC power, and its operation reliability largely determines the operation reliability of the UHV DC grid. [0003] Since traditional converters mostly use semi-controlled device thyristors as the core components to form a six-pulse bridge commutation topology, each bridge arm is composed of multi-level thyristors and their buffer components connected in series. Com...
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Login to View More IPC IPC(8): H02M7/155H02M1/34H02M1/06
Inventor 张静汤广福欧阳文敏李婷婷王蒲瑞
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD