摘要
现阶段变压器差动保护、备自投、母线保护等装置都需要适应电磁式互感器、电子式互感器(含合并单元)同时接入的情况,为此设计了一种适用于混合数据源接入保护装置的数据同步采样方法。以保护装置内部的采样脉冲时刻为同步基准,对多路采样值(SV)输入进行插值同步,并同时启动模拟量输入的AD转换;通过实时测频和实时调整采样间隔对不同类型数据源输入信号的频率进行跟踪,以实现同步采样。该方法提高了智能变电站二次设备的适应性,在保护装置和模拟量输入的级联合并单元中均可采用。采用现场可编程门阵列(FPGA)实现了设计方案,在智能化保护装置中的应用和测试结果验证了该方案的有效性。
As the protective devices,including transformer differential protection,automatic backup-power switchover,bus protection and so on,should now adapt to the connection of electromagnetic transformer and electronic transformer（including merging unit） at the same time,a scheme of synchronous data acquisition from multiple data source types is designed for smart substation protections,which takes the sampling pulse inside the protective devices as the benchmark to synchronize the multi-channel SV（Sampled Value） inputs by the interpolation and to simultaneously start the AD conversion of analog inputs,as well as tracks the input signal frequencies of different data sources by the real-time frequency detection and sampling interval adjustment to realize the synchronous sampling. It can be applied to the smart secondary devices, such as relay protections and cascaded merging units of analog inputs, to improve their adaptability. It is implemented based on FPGA and its effectiveness is verified by its application in the smart protections and the test results.
出处
《电力自动化设备》
EI
CSCD
北大核心
2015年第11期158-164,共7页
Electric Power Automation Equipment
基金
山东省自然科学基金资助项目(ZR2014EEM039)
济南大学博士科研启动基金资助项目(XBS1408)~~
关键词
智能变电站
保护
混合数据源
插值
同步
采样
合并单元
电磁式互感器
smart substation
electric power system protection
hybrid sources
interpolation
synchronization
sampling
merging unit
electromagnetic transformer
