A hybrid high-voltage direct current circuit breaker and its realization method

A DC circuit breaker, high-voltage DC technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problem that the breaking time cannot meet the multi-terminal flexible DC transmission system, the technical difficulty is high, and the manufacturing cost is high. problems, to achieve the effect of easy expansion, mature technology and high pressure resistance
CN104767170BActive Publication Date: 2018-12-11STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2018-12-11

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Abstract

The invention relates to a circuit breaker and a realization method thereof, and specifically relates to a mixed high-voltage direct-current circuit breaker and a realization method thereof. The direct-current circuit breaker is based on the principle of secondary current transfer. A main branch is composed of a quick-action mechanical switch and a current transfer module which contains a full-controlled device, which ensures the advantages of low loss and flexible current transfer control in the state of normal conduction. A first current transfer branch is composed of half-controlled device thyristors connected in series, so that the circuit breaker has strong fault flow capacity and breaking capacity, 'zero voltage and zero current' of the mechanical switch can be maintained long enough, and arc-free switching of the mechanical switch is realized. A second current transfer branch is composed of capacitors with pre-charged voltage, an inductor, and series-connected thyristors. After the thyristors of the first current transfer branch are reliably switched off, the capacitors quickly build up direct voltage high enough to resist the system, and an energy absorption circuit limits the voltage of the capacitors. Thus, the size and cost of the capacitors are well controlled.
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Description

technical field

[0001] The invention relates to a circuit breaker and a realization method thereof, in particular to a hybrid high-voltage direct current circuit breaker and a realization method thereof. Background technique

[0002] With the application of multi-terminal flexible DC and DC grid technology based on voltage source converter (VSC), fast DC circuit breaker has become one of the key devices to ensure the stable, safe and reliable operation of the system. In the AC system, the AC current has two natural zero-crossing points in one cycle, and the AC circuit breaker uses the natural zero-crossing point of the current to turn off the current, while in the DC system, the DC current does not have a natural zero-crossing point, so the DC current The breaking of AC current is far more difficult than the breaking of AC current.

[0003] There are usually three ways to break the DC current. One is to add an auxiliary circuit on the basis of the conventional AC mechanical...

Claims

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