基于GPS相量量测单元设计.doc

基于GPS的相量量测单元设计 摘要 随着大电网互联的形成和电力市场改革的逐步推进，迫切需要一种能够了解到整个广域电网状态的监测系统，因此，广域电力系统实时监测系统应运而生。作为该系统的检测前端，广域相量测量装置(PMU)的测量水平，直接影响到该监测系统的有效性及精确性。 本文提出了一种可以实现时间同步的广域相量测量实现方案。该方案使用了DSP芯片TMS320VC5409作为核心的系统平台，AD7656高精度数据采集板实现电压电流数据采集；GPS采集板提供卫星授时的同步信号；USB/NET板实现数据的保存和远程传输。本文详细介绍了GPS模块、AD数据采集模块、以太网接口模块以及CPLD中的选择逻辑的实现方法，编写了相应的测试程序，并进行了功能测试。测试结果表明本文系统可以实现广域相量量测的功能。 关键词:广域测量；PMU；A/D采样；GPS定位 GPS BASED PHASOR MEASUREMENT UNIT DESIGN Abstract Following with the shaped of the big power interconnected grid and the impelling of power market reforming, a system that can monitor the status of wide area power net is needed. Therefore, a wide area measurement system becomes true. The performance of PMU takes a important effect on the effectively and precision. In this article we present a method to realize phasor measurement based on the GPS time synchronization. This project uses DSP chip TMS320VC5409 as the core of the system;AD7656 high-precision data acquisition board to realize data acquisition of voltage and current; GPS satellite acquisition board to provide time synchronization signal; USB / NET plate to achieve data preservation and long-distance transmission. This article has described various units in detail including GPS module, AD data acquisition module, Ethernet interface module, as well as CPLD logic module. We have programmed corresponding applications to realize the actual circuit board of the GPS and data acquisition on transmission of functional testing. The test results show that the system can meet the requirement of the wide-area phasor measurement . Keywords：WAMS; PMU; A/D Sampling; GPS 摘要 I Abstract II 1绪论 1 1.1相量量测装置的研究背景和意义 1 1.1.1大电网形成及电力市场改革的挑战 1 1.1.2现有监测系统存在的问题 1 1.2研究同步相量测量技术的意义 2 1.3相量测量技术的国内外现状 2 1.3.1国外研究现状 2 1.3.2国内研究现状 3 1.3.3标准化进程 4 1.4本文研究内容 4 2基于DSP的广域测量装置原理 5 2.1广域电力系统实时监测系统简介 5 2.2基于DSP的广域相量测量装置结构 6 3基于DSP的广域相量量测装置的硬件模块 7 3.1硬件整体方案 7 3.2 GPS模块介绍 8 3.3网卡/USB模块介绍 9 3.3.1以太网模块 9 3.3.2 USB模块 10 3.4 AD转换电路 11 3.5核心芯片TMS320VC5409 12 3.6 CPLD硬件电路 16 4系统软件设计