Natural converting type hybrid high-voltage DC circuit breaker

Abstract

The invention relates to a natural converting type hybrid high-voltage DC circuit breaker, and belongs to the field of DC circuit breakers applied to DC transmission distribution networks. The circuit breaker is formed by connecting a plurality of completely the same high-voltage DC circuit breaker modules in series though a disconnecting switch; each high-voltage DC circuit breaker module is on the basis of the natural converting type hybrid DC circuit breaker; each circuit breaker module comprises a main current branch, a main circuit breaker branch, an overvoltage protecting and energy absorbing branch and a measuring control system; the three branches are interconnected in parallel and are respectively connected with the measuring system; the measuring system controls the working time sequences of the three branches. According to the circuit breaker, active devices such as charging capacitor for assisting zero crossing are saved; the control is simple, the reliability is high, and the demand of domestic DC transmission network and DC distribution network on the DC circuit breaker can be met.

Description

technical field [0001] The invention belongs to the field of DC circuit breakers used in DC transmission and distribution networks, and relates to a natural commutation hybrid DC circuit breaker based on fast mechanical switches and power electronic solid-state switches, mainly considering the coordination of fast mechanical switches and power electronic solid-state switches. It involves the design of the mechanical switch fracture and the design of the power electronic solid-state switch, as well as the principle of the breaking process and the energy absorption process. Background technique [0002] In the face of rapid economic and social development, users have put forward requirements for power systems that are more environmentally friendly, safe and reliable, high-quality and economical, and support two-way interaction between users and the power grid. With the rapid growth of city scale, the continuous development of distributed energy sources, and the increase of pow...

AI Technical Summary

Problems solved by technology

[0006] 1. Since the current in the DC system does not have a natural zero-crossing point, if the traditional AC circuit breaker is used to break the DC, it is very difficult to extinguish the arc;

[0007] 2. After breaking the DC current, a large overvoltage will be generated, and at the same time, a large amount of energy stored in the DC system needs to be absorbed;

Among them, the auxiliary switch is a power electronic switch, which has a large conduction loss during normal operation.

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