Method for turning on/off electro-mechanical integrated high-voltage direct-current circuit breaker

Abstract

The invention provides a method for turning on/off an electro-mechanical integrated high-voltage direct-current circuit breaker. The method comprises the following steps: when a short circuit failure occurs at a high-voltage direct-current side and current and a current rise gradient reach corresponding on/off set values, a super-fast mechanical switch is immediately activated to separate contacts in a super-high instantaneous separating speed, a physical clearance is formed, electric arcs are produced, and an on/off command is instantly sent to a power electronic switch; short circuit current is quickly disconnected by the power electronic switch so as to quickly extinguish the electric arcs between the contacts of the super-fast mechanical switch and form an isolation fracture; when the contacts of the super-fast mechanical switch are separated to a final breaking position and the current in a lightning arrester is attenuated to zero, the circuit breaker finishes the whole on/off process, and a high-voltage direct-current power transmission power grid is isolated from the failure circuit. Optimal matching can be carried out in the comprehensive consideration of the cost-to-performance ratios of different elements. The elements can be reduced as far as possible, the size is reduced, the weight is reduced, and the reliability is improved. A novel means is created for the research and development of future high-voltage switch products.

Description

technical field [0001] The invention relates to a breaking method, in particular to a breaking method of an electromechanical integrated high-voltage direct current circuit breaker. Background technique [0002] Reliable and efficient power supply and the exploitation and utilization of renewable resources pose great challenges to improve power transmission modes. Based on the advantages of low loss, long-distance, high-power transmission, more efficient connection of renewable energy into the grid, and flexible operation, high-voltage direct current transmission has received new attention. In particular, the emergence of flexible DC transmission technology based on voltage source converters makes the preparation and development of multi-terminal HVDC grids possible and more and more attractive. A DC circuit breaker with the functions of quickly breaking DC fault current and isolating faults is an essential and crucial component for realizing a multi-terminal high-voltage D...

AI Technical Summary

Problems solved by technology

This is undoubtedly a great progress, but there are still some defects; such as the large number of power electronic components required, and many standby backup components are required from the perspective of safety and reliability; the volume is large, the control system is complicated, the price is expensive, and the protection and control coordination is not yet available. It needs to be considered; the type test items need to be further discussed and determined; especially the reliability and operation of power grids with different topological structures need to be tested.

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