Capacitive buffer type mixed high-voltage direct current circuit breaker and control method thereof

Abstract

The invention discloses a capacitive buffer type mixed high-voltage direct current circuit breaker and a control method thereof. The circuit breaker comprises a mechanical switch unit, a current conversion unit, a capacitive buffer unit and a mechanical switch energy supply unit, wherein the mechanical switch unit is formed by connecting at least one mechanical switch sub-unit in series; the mechanical switch sub-unit is formed by connecting a mechanical switch, a voltage sharing module and an energy-absorbing voltage-limiting module in parallel; the current conversion unit is formed by connecting a power electronic switch module and a voltage-limiting module in parallel; the power electronic switch module comprises at least one power electronic device; the capacitive buffer unit consists of capacitor banks and provides a current conversion buffer branch for fault current; the mechanical switch energy supply unit supplies electric energy to the mechanical switch, and the quickness and the coordination of the motion are ensured. The capacitive buffer type mixed high-voltage direct current circuit breaker and the control method thereof, provided by the invention, have the advantages that the capacitive buffer type mixed high-voltage direct current circuit breaker is simple in structure, convenient to control, high in speed, high in reliability, high in galvanization voltage resistance level, small in size and low in cost.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current circuit breakers, and more specifically relates to a capacitor-buffered hybrid high-voltage direct current circuit breaker and a control method thereof. Background technique [0002] The DC transmission method is the earliest transmission method in history, but it was quickly replaced by the AC transmission technology because it failed to solve key technologies such as voltage changes. However, in recent years, with the development of power systems, the need for special power transmission technology and the advancement of high-power power electronics technology, HVDC transmission has gained attention and application development due to its unique advantages. Compared with AC transmission, HVDC transmission has the advantages of economical line cost, no need for stable operation of the two-terminal system, and simple and easy power adjustment. It is especially suitable for ultra-high volta...

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a capacitor-buffered hybrid high-voltage DC circuit breaker and its control method, which can meet the needs of the DC system for rapid action of the high-voltage DC circuit breaker itself, breaking large currents and On the basis of withstanding high voltage, it solves the problems of complex control, poor reliability and bulky volume of existing high-voltage DC circuit breakers

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