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A steady-state energy supplement control strategy for a hybrid HVDC circuit breaker

A high-voltage DC, control strategy technology, applied in emergency protection circuit devices, emergency power protection, electrical components and other directions, can solve problems such as limiting the application of DC circuit breakers, achieve simple and easy control strategies, avoid insulation and withstand voltage problems, The effect of preventing power supply reliability

Active Publication Date: 2019-04-16
ZHEJIANG UNIV
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Problems solved by technology

However, the above circuit breakers all use external power supply to supply energy to the IGBT drive circuit in the circuit breaker, but since the circuit breaker needs to be connected in series in the DC line, and the DC voltage level is high, the insulation and withstand voltage of the external power supply circuit Capability puts forward higher requirements, this defect greatly limits the application of DC circuit breakers in the field of high voltage technology

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  • A steady-state energy supplement control strategy for a hybrid HVDC circuit breaker
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  • A steady-state energy supplement control strategy for a hybrid HVDC circuit breaker

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Embodiment Construction

[0031] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The research object of the present invention is figure 1 The hybrid high-voltage DC circuit breaker shown is composed of a daily flow branch and a fault interruption branch; wherein, the daily flow branch includes an ultra-fast mechanical switch and a load transfer switch; the fault interruption branch is routed by the main The circuit breaker and arrester are connected in parallel. Both the load transfer switch and the main circuit breaker in the hybrid HVDC circuit breaker are composed of several improved full-bridge sub-modules (IFBSM) connected in series.

[0033] The IFBSM used in the present invention is composed of 2 IGBTs, 4 diodes and 1 sub-module capacitor. The improved full-bridge sub-module mainly includes two switching states, namely...

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Abstract

The invention discloses a steady-state energy-supplementation control strategy of hybrid high voltage DC circuit breaker. According to the invention, through a reasonable switch action time sequence, capacitor voltage of an improved full-bridge sub module can be made to fluctuate within a manually set threshold value range, so that energy stability is ensured and influence on power supply reliability of a drive circuit of the full-bridge sub module due to violent fluctuation of the capacitor voltage is prevented. Besides, since a load transfer switch and a main circuit breaker get energy through capacitors of sub modules of themselves respectively, external power supply is not needed, so that problems of insulation of voltage resistance in projects are avoided; design, manufacture and construction difficulties are reduced; and application of the circuit breaker typology in a high voltage DC power grid is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to a steady-state energy supplement control strategy for a hybrid high-voltage direct current circuit breaker. Background technique [0002] In order to solve cross-regional and large-scale power transmission and improve the acceptance capacity of distributed new energy, flexible DC grid technology based on modular multilevel converters is gradually becoming one of the important directions for the future development of my country's power grid. Compared with AC transmission and traditional DC transmission technology, flexible DC transmission has the advantages of decoupling control of active power and reactive power, no reactive power compensation device, small footprint, and good output voltage waveform quality. However, although it has significant advantages in steady-state operation, it still has major technical difficulties in DC fault protection and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H1/06
CPCH02H1/06H02H7/268
Inventor 徐政肖晃庆徐雨哲王世佳
Owner ZHEJIANG UNIV
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