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DC current cut-off device and method based on matching of split-phase damping MMC and AC circuit breaker

An AC circuit breaker and damping technology, which is applied in the direction of emergency protection circuit devices, power transmission AC networks, electrical components, etc., to achieve the effect of rapid recovery

Inactive Publication Date: 2019-03-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of cutting off DC fault lines suitable for multi-terminal DC transmission systems and DC power grid engineering applications

Method used

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  • DC current cut-off device and method based on matching of split-phase damping MMC and AC circuit breaker
  • DC current cut-off device and method based on matching of split-phase damping MMC and AC circuit breaker
  • DC current cut-off device and method based on matching of split-phase damping MMC and AC circuit breaker

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Embodiments of the present invention provide a DC current interruption device and method for cooperating with an AC circuit breaker using a phase-separated damping input MMC topology. The phase-separated damping input MMC topology is as follows: figure 1 Shown:

[0026] The proposed MMC converter station is a phase-separated damping input MMC topology, and the damping input module is added to the three-phase six-leg bridge arm of the normal half-bridge MMC converter station.

[0027] The embodiment of the present invention provides a DC cut-off method in which the phase-separated damping input MMC topology cooperates with an AC circuit breaker. The specific flow chart of the cut-off process is as follows figure 2 As shown, the specific process is as follows:

[0028] The sensor on the line i monitors the voltage Vdci and current value Idci of the li...

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Abstract

The invention relates to a DC current cut-off device and method based on matching of split-phase damping input type MMC topology and an AC circuit breaker, belonging to the technical field of flexibleDC transmission. The invention provides a DC current cut-off device and strategy based on matching of split-phase damping input type MMC topology and an AC circuit breaker. After a fault is detectedby a sensor on the line, a converter station starts a fault control scheme, and three-phase bridge arm sub-modules all adopt a bypass strategy. At the same time, the bridge arms asymmetrically enablerespective damping modules. After the control strategy is started, an AC component is superimposed on a DC bus. When the AC circuit breaker detects the zero-crossing point, the AC circuit breaker begins to be switched off. When the AC circuit breaker is completely switched off, an isolator is pulled off. The device and the method can effectively cut off DC lines with faults and guarantee quick recovery after faults. Compared with the DC circuit breaker scheme, the device and the method have the advantages that the use of the AC circuit breaker can greatly reduce the cutoff cost. The technicalscheme can also be effectively applied to the DC power grids.

Description

technical field [0001] The invention relates to a direct-current interruption device and method in which a phase-splitting damping input type MMC topology cooperates with an alternating-current circuit breaker, and belongs to the field of flexible direct-current transmission. Background technique [0002] Flexible multi-terminal direct current transmission system and direct current grid technology connect renewable energy and traditional energy in a wide area, which can fully realize the complementarity between various energy forms, large space spans, multi-time scales, and multi-user types. It is an important development of the future power grid direction. MTDC and DC grid technologies have many advantages. Compared with the traditional AC system, the flexible DC grid mainly composed of power electronic equipment is a "low inertia" system, and its response time constant is at least 2 orders of magnitude smaller than that of the AC grid. After a severe DC short-circuit fau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 赵成勇陆锋李钰许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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