Self energy taking device of high voltage direct current circuit breaker and implementing method thereof

Abstract

The invention discloses a self energy taking device of a high voltage direct current circuit breaker and an implementing method thereof. The self energy taking is composed of a circuit energy taking unit, a high frequency inverter circuit, a high frequency transformer, a magnet ring transformer and a rectifying and voltage-stabilizing circuit connected successively; the implementing method of the self energy taking device includes the steps of: when the circuit energy taking unit is connected into the main branch of the high voltage direct current circuit breaker in series, obtaining energy from the current of the main branch; when current flows through the main branch, controlling the switching-on and switching-off of a switch tube; regulating the charging time of a capacitor to control the voltage range of the capacitor. The self energy taking device provided by the invention utilizes the energy in the circuit without using an additional independent power supply, is applicable to the mechanical switch and power electronic device mixed type direct current circuit breaker, and is lower in insulating requirement of the high frequency transformer with respect to a scheme of supplying power from low potential through the high frequency transformer when being applied to a current limiting device composed of a plurality of direct current circuit breaker connected in series.

Description

technical field [0001] The invention relates to a power electronic device, in particular to a self-energy harvesting device of a high-voltage direct current circuit breaker and a realization method thereof. Background technique [0002] High-voltage DC circuit breakers are mainly used in DC transmission and distribution lines to break the current of DC lines. In order to reduce the on-state loss and shorten the operating time of the circuit breaker, DC circuit breakers using a hybrid of mechanical switches and power electronic devices have received more and more attention, and a variety of topologies have been derived. When this type of DC circuit breaker is in normal operation, the current flows through the mechanical switch. When an overcurrent fault occurs in the line, the current is transferred to the branch circuit of the power electronic device connected in parallel, and then the power electronic device breaks the current. [0003] For example, the circuit breaker int...

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Problems solved by technology

However, the cost of laser energy delivery is high, especially when the IGBT unit or cascaded sub-modules have more functions, the energy required for energy supply is greater, which undoubtedly greatly increases the cost of the equipment

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