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Start-up control strategy for hybrid high-voltage DC circuit breaker

A high-voltage DC, start-up control technology, applied in the direction of automatic disconnection of emergency protection devices, circuit devices, battery circuit devices, etc., can solve problems such as limiting the application of DC circuit breakers, achieve small grid impact, smooth start-up process, and avoid insulation. and the effect of pressure resistance

Active Publication Date: 2017-12-15
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

Method used

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  • Start-up control strategy for hybrid high-voltage DC circuit breaker
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  • Start-up control strategy for hybrid high-voltage DC circuit breaker

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Embodiment Construction

[0034] 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.

[0035] 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.

[0036] 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 start-up control strategy for a hybrid high-voltage DC circuit breaker. The control strategy enables the hybrid high-voltage DC circuit breaker to be smoothly started through a reasonable switching sequence. External power supply is not required because a load transfer switch and a main circuit breaker directly take power through respective submodule capacitors, thereby avoiding problems of insulation and withstand voltage which are difficult to solve in engineering, reducing the design, manufacturing and construction difficulty, and being conducive to application of the circuit breaker topology in a high-voltage DC power grid. Meanwhile, the start-up process of the hybrid high-voltage DC circuit breaker is smooth, the impact for the power grid is small, and no influence is generated for stable running of the power grid.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to a start-up control strategy of 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 handling, among which t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H7/26H02J3/36
CPCY02E60/60H02H3/087H02H7/26H02J3/36H02J7/345
Inventor 徐政肖晃庆徐雨哲王世佳
Owner ZHEJIANG UNIV
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