用于实时电源保护功能的低成本继电器样机的研制

Pablo Rodrigues Lopes, Rui Bertho Junior
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引用次数: 1

摘要

本文提出了一种基于树莓派3B+的低成本通用继电器,能够实时运行电源保护功能。显示了该单板计算机能够提供实时响应所需的配置,以及验证其响应时间的延迟测试。建立了一种实验电路,将三相故障信号从继电器测试仪发送到低成本继电器,以比较其与商用继电器的故障清除响应时间。提出了一种低成本的神经网络算法,该算法能够区分三相故障和大负荷变化产生的暂态信号。结果表明,与商业继电器相比,低成本继电器能够在预定义的运行时间和可接受的精度内运行简单和复杂的保护功能。然而,低成本继电器能够处理的采样频率是有限的。结果还表明,低成本继电器满足软实时系统的要求,而对于需要硬实时系统的实际电力保护系统来说,这是不理想的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a Low-Cost Relay Prototype for Real-Time Power Protection Functions
This paper presents a Raspberry Pi 3B+ based low-cost universal relay able to run power protection functions in real-time. The configurations necessary for this single-board computer to be able to provide real-time response are shown, as for latency tests to verify its response time. An experimental circuit was built to send three-phase fault signals from a Relay tester to the low-cost relay, in order to evaluate its response time to clear faults in comparison to a commercial relay. A neural networks algorithm was developed and executed in real-time by the proposed low-cost relay, which is able to differentiate three-phase faults from transient signals created from large load variations. The results show that the low-cost relay is capable of running simple and complex protection functions within a pre-defined runtime and acceptable precision, compared to a commercial protection relay. However, the sampling frequency the low-cost relay is able to handle is limited. The results have also shown that the low-cost relay meet the requirements for a soft real-time system, which is not ideal for practical power protection systems that require hard real-time systems.
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