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| 摘要: |
| 分析了电力系统实时监控系统对同步相量测量装置(PMU)在实时性、可靠性和精确性3个方面的要求,并以一套典型硬件平台为例,讨论了基于Windows系统的PMU的性能特点以及在实时性方面的不足,给出了描述PMU实时性的重要指标——发送延时。在相量计算中采用了递归离散傅里叶(DFT)算法,大大减小了计算量,提高了系统的实时性;分析了Windows系统下消息机制的根本缺陷,提出分别利用虚拟设备驱动(VxD)和多线程技术实现中断和查询2种软件运行机制的方法,并应用于PMU的原始数据处理与数据传输中。测试结果表明,该方法可以有效改进Windows环境下监测系统的实时性,能够满足系统实时运行的要求。 |
| 关键词: 相量测量装置,递归离散傅里叶变换,虚拟设备驱动,多线程 |
| DOI： |
| 分类号:TM933 |
| 基金项目: |
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| Analysis of PMU performance in Windows system |
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LIU Bing-xu ZHAO Jian-guo GAO Hou-lei
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| Abstract: |
| Performance indexes of PMU(Phasor Measurement Unit) are analyzed in real-time,reliability and accuracy.With a typical hardware platform as an example,features of PMU in Windows system and its shortages in real-time performance are discussed.An important index is proposed to represent the real-time performance-the transmission delay.The recursive DFT is introduced in phase calculation to reduce calculation time and improve real-time performance.The limitation of MPI(Message Passing Interface) in Windows system is analyzed,and VxD(Virtual Device Driver) and multithread technologies are used to implement message mechanism and demand mechanism for data acquisition and data transmission respectively.Test results show that the real-time performance is improved to meet the requirement. |
| Key words: PMU,recursive DFT,Virtual Device Driver,multithread |
