Bidirectional Z-source solid-state direct-current circuit breaker based on novel topological structure

Abstract

The invention discloses a solid-state direct-current circuit breaker based on a Z-source structure, which is used for solving the problems that a one-way circuit breaker can only realize one-way energy flow, a circuit structure load, a load and a power supply of a two-way circuit breaker are not in common ground, and large current is fed back. According to the technical scheme, a forward flow channel and a backward flow channel of circuit topology energy are formed by using four diodes, a thyristor, a capacitor and a transformer with the ratio of primary side to secondary side being 2: 1. When a fault occurs, the reverse induction current of the primary side of the transformer is increased, so that the thyristor current is gradually reduced to 0 to be turned off; then the circuit enters a resonance state to continuously charge the capacitor, and the secondary side voltage of the transformer rises and then drops to 0 and is kept; and then, the energy stored in the transformer winding is completely consumed in the follow current loop, the winding current is reduced to 0, and the fault is completely isolated. The problems that energy and power cannot flow bidirectionally and power loads are not common-grounded are solved, and practicability is high.

Description

Technical field: [0001] The invention belongs to the technical field of DC circuit breakers, and in particular relates to a circuit structure of a novel bidirectional Z-source DC solid-state circuit breaker. Background technique: [0002] At present, DC circuit breakers are mainly divided into three categories, namely, pure mechanical DC circuit breakers that use traditional mechanical switches to break, all solid-state circuit breakers that use power electronic devices (SCR, IGBT) to break, and hybrids that combine the two forms. circuit breaker. However, mechanical circuit breakers have disadvantages such as long turn-off time and easy arc generation, while ordinary solid-state circuit breakers have disadvantages such as complex circuits, low reliability, difficult control and high cost. [0003] In the literature "Beheshtaein S, Cuzner R M, Forouzesh M, et al. DC microgrid protection: A comprehensive review [J]. IEEE Journal of Emerging and Selected Topics in Power Elect...

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Problems solved by technology

[0005] In order to overcome the disadvantages of the existing one-way circuit breaker that can only realize energy flow in one direction and the circuit structure load of the two-way circuit breaker, the load and the power supply are not in the same ground, and feedback large current, etc., the present invention provides a new type of bidirectional DC solid-state circuit breaker The circuit topology of the device can effectively overcome the above shortcomings

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