飞机固态二次配电装置SPDA的余度设计

为提高配电系统可用度,现代飞机广泛采用固态二次配电装置SPDA来取代传统的由继电器/断路器组成的配电系统,它避免了机电式控制装置在开通/关断瞬间产生的电弧,同时也提高了系统使用寿命。SPDA的高可用度除了依赖固态功率控制即SSPC技术外,在系统架构的设计上,采用了余度管理技术。其中计算技术采用了硬件的余度设计思想,而输入/输出模块则采用了软件的余度设计。在定量分析了采用余度管理技术对系统可用度的影响后,得出的结论是采用硬件余度的计算技术的可用度从原有的99.999%提高到99.999 999 98%,采用软件余度的输入/输出模块的可用度从99.998%提高到了99.998 999 99%。

Redundancy design of aircraft secondary power distribution apparatus

In order to improve the availability of power distribution system,solid-state power distribution apparatus(SPDA) is widely used in the modern aircrafts to replace the traditional relay/breaker composed electric distribution system.It avoids the arc phenomenon during switching on/off as occurs in traditional electric-mechanical apparatus.As a result,the system life is elongated.The high availability of SPDA depends not only on the adoption of solid state power controller(SSPC) technology but also on the redundancy management of system structure design,where the hardware redundancy design is used for computing module.The software redundancy design is employed for input/output module.After the quantitative analysis of the impact of redundancy management on the system availability,the conclusions that hardware redundancy can improve the system availability from 99,999% to 99.999 999 98% and the software redundancy can improve the availability of input/output module from 99.998% to 99.998 999 99% were obtained.