DC power distribution network energy router based on PWM/diode hybrid rectification structure, and control method for DC power distribution network energy router

Abstract

The invention discloses a DC power distribution network energy router based on a PWM / diode hybrid rectification structure, and a control method for the DC power distribution network energy router. Theenergy router comprises a high-voltage side power transformation unit, a low-voltage side PWM / diode hybrid rectification unit, and a medium-high frequency three-phase AC transformer, and is used forachieving the interconnection of DC buses at different voltage levels in a DC power distribution network in a power distribution network. The low-voltage side PWM / diode hybrid rectification unit comprises a low-voltage side PWM rectification unit and a plurality of low-voltage side diode rectification units. The low-voltage side PWM rectification unit employs the AC / DC transformation topology based on a full-control device, and the low-voltage side diode rectification units employ the three-phase non-control rectification topology based on a diode non-control device. The medium-high frequencythree-phase AC transformer employs one-input multi-output coupling mode. The energy router can achieve the bidirectional transmission of electric energy, is simple and reliable in control, is strong in through-current capability, is small in number of used devices, and greatly reduces the cost. When the power of a load fluctuates, the power output can be adaptively adjusted.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a DC distribution network energy router based on a PWM / diode hybrid rectification structure and a control method thereof. Background technique [0002] DC power transmission and distribution technology has the advantages of fewer transmission wires, less power loss, high power supply reliability, and easy access to new energy power generation systems, and has gradually become a research hotspot in the field of power transmission and distribution. Similar to the AC system, in the DC power transmission and distribution system, it is usually necessary to connect the DC grids of different voltage levels, and it is difficult to directly realize the voltage conversion through the AC transformer in the DC grid. Research hotspots in the field of power distribution. [0003] The energy router based on the power electronic conversion topology can not only convert the...

AI Technical Summary

Problems solved by technology

However, with the increase of DC grid voltage level and power level, the above topology complexity will be greatly increased, the number of required power devices will increase rapidly, the topology flexibility is poor, and the cost is high, which greatly limits its engineering application.

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