Aircraft DC power supply system and power supply method

Abstract

The invention discloses an aircraft DC power supply system and a power supply method. The system comprises: at least two generators and correspondingly connected motor controllers for generating and outputting DC power to corresponding primary power bus bars; at least two primary power bus bars respectively connected to the at least two generators through controllable switches, wherein the two adjacent primary power bus bars are connected to each other; an external DC power source connected to the primary power bus bars through the controllable switches for supplying power to the primary powerbus bars in the engine starting state; DC power conversion devices, wherein the input ends are connected with the primary power bus bars, and the output ends are connected with key load bus bars forconverting the DC power on the primary power bus bars and outputting to the key load bus bars; and the key load bus bars for supplying power to corresponding key loads. The power density of the systemis improved and the continuous power supply of the power supply system when single or multiple generators are faulty is achieved.

Description

technical field [0001] Embodiments of the present invention relate to aircraft power supply technology, in particular to an aircraft DC power supply system and a power supply method. Background technique [0002] Existing aircraft adopt an AC power supply system, that is, a system in which a generator is used to generate three-phase AC power and transmit the three-phase AC power to various electrical loads. The aircraft AC power supply system includes a voltage conversion device, which converts the AC power generated by the generator into various forms of AC power with different voltages and frequencies. At the same time, since the electrical load has the power demand of DC power, for example, the starting system used for engine starting requires DC power as the input power. Therefore, the AC power supply system of the aircraft will also use the AC power conversion device to convert the three-phase AC rectification to DC power. [0003] The aircraft AC power supply system ...

AI Technical Summary

Problems solved by technology

[0004] Since the starting input power of the engine starting system is DC power, and the input power reaches 100kW, in order to meet the power demand of the DC power load in the DC power supply system, an AC power conversion device higher than 100kW is required to rectify the high-power AC power into DC power. This increases system weight and reduces system power density

Moreover, due to the difference in frequency and phase angle between the AC power generated by different generators in the AC power supply system, when one of the generators fails, it is necessary to complete the closing action of the contactor between the bus bars to connect the bus bars electrical connection between, thus, causing a temporary loss of electrical energy in the event of a fault

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