Power distribution system and power distribution method

Abstract

The invention relates to the technical field of power distribution and protection and in particular relates to a DC zonal power distribution system and a power distribution protection method developed based on the power distribution system. The power distribution system comprises a medium-voltage DC bus, a low-voltage DC bus, a DC low-voltage load, an AC low-voltage load, an AC medium-voltage load and a plurality of AC generators; the AC generated by each AC generator is converted into DC by a rectifier for supplying to the medium-voltage DC bus; the medium-voltage DC bus is capable of inverting medium-voltage DC into medium-voltage AC by use of a primary inverter and then supplying the medium-voltage AC to the AC medium-voltage load, and the medium-voltage DC bus is also capable of stepping down the medium-voltage DC into low-voltage DC by use of a primary chopper and supplying the low-voltage DC to the low-voltage DC bus; the low-voltage DC bus is capable of stepping down the low-voltage DC into the voltage needed by the DC low-voltage load by use of a secondary chopper and inverting the low-voltage DC into the voltage needed by the AC low-voltage load by use of a secondary inverter. The power distribution system realizes the conversion, transmission and distribution of electric energy; besides, the engineering application range of the DC power system is expanded.

Description

technical field [0001] The invention relates to the technical field of power distribution and protection, in particular to a DC region power distribution system and a power distribution protection method based on the power distribution system. Background technique [0002] In recent years, the DC power system has become a research hotspot, and research results in electric vehicles, subways, ships, and high-voltage DC transmission have emerged in an endless stream. With the continuous improvement of the performance of power electronic devices, the emergence of new power electronic devices, and the increasingly mature control methods, the superiority of DC power systems in terms of power quality, efficiency, and structure will be more fully reflected. [0003] However, in the existing DC power system, the lack of DC circuit breakers has become an important factor restricting its entry into engineering applications. So far, circuit breakers designed and manufactured based on A...

AI Technical Summary

Problems solved by technology

Different from the AC system, there is no current zero-crossing point in the DC power system. Therefore, it is much more difficult to use the traditional AC circuit breaker to break the DC arc in the DC power system, and an additional circuit is required to manually generate the current zero-crossing point to analyze the fault.

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