Rail transit hybrid power circuit, energy storage power pack and power supply method thereof

Abstract

The invention discloses a rail transit hybrid power circuit, an energy storage power pack and a power supply method thereof. The hybrid power circuit includes a lithium battery and a grid branch; the lithium battery is connected to a supercapacitor through a step-up / down module; the supercapacitor The capacitor output terminal is connected with the charging branch and the first contactor; both the first contactor and the charging branch are connected with the load; the grid branch is connected with the load through the second contactor. The present invention combines a power-type supercapacitor with an energy-type lithium battery. The lithium battery is combined with the supercapacitor through a DC / DC converter. The transmission between capacitors makes full use of the characteristics of high energy density of lithium batteries and high power density of super capacitors, so that the locomotive can still exert high-power traction when passing through the non-electric zone, and at the same time absorb and reuse regenerative braking energy when the locomotive is running, To achieve the purpose of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the field of rail transit power drive, in particular to a rail transit hybrid power circuit, an energy storage power pack and a power supply method thereof. Background technique [0002] At present, the rail transit vehicles that use the power grid to receive current cannot exert traction when passing through the non-electric area, and the exhaust gas emissions generated by the internal combustion-driven rail transit vehicles driving into the tunnel may have dangerous consequences. The power drive mode can effectively improve the operating efficiency of the locomotive and reduce the exhaust gas emission of the locomotive in the tunnel and even in the entire line section. At present, the main energy storage components include batteries, supercapacitors, etc. Batteries are further divided into lead-acid batteries, alkaline batteries, lithium batteries, etc. Lithium batteries with relatively high energy density and power density a...

AI Technical Summary

Problems solved by technology

Although lithium batteries are widely used in pure electric vehicles and hybrid vehicles, high current charging and discharging have adverse effects on the life and efficiency of lithium batteries

Although supercapacitors can quickly perform high-power charging and discharging, their low energy density cannot complete the task of being a vehicle-mounted energy storage component alone.

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