【作者】 吕翔；

【导师】 江道灼；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 随着经济建设的飞速发展,电网装机容量不断增大,全国电网互连步伐的加快,同时对电力系统的稳定监控提出了更高的要求,因此,广域电网相量测量系统(WAMS)应运而生。作为该系统的现场基础测量单元,基于全球定位系统(GPS)的广域电网相量同步测量装置(PMU)的测量水平,将直接影响到该系统的有效性及精确性。本文提出一种同步时标可自由设定的新型PMU,它由频率自适应等间隔采样模块、同步时标形成模块和核心微处理器模块等构成,通过硬件电路与计算软件的合理分工与协调配合,实现了相量同步测量装置中“时间同步”与“频率同步”的解耦处理,从而装置能够根据自由设定的同步时标与时标同步方式,自动定位截取整周波采样数据(无频谱泄漏)进行高精度DFT相量计算,并通过简单的方法对截取DFT数据窗时造成的时标同步偏移量进而计算相量的相角偏差量进行高精度线性修正,且就本装置实现的同步时标任意设置中最常用的首点、中点、末点三种同步方式的跟踪效果及相量测量精度进行仿真分析。文章对这种新型PMU的硬件平台进行了深入研究分析,设计开发出相应的电路,并进行了大量调试工作,对所需实现的各项功能进行了部分验证。本文还设计了用于相量测量装置内DSP部分与MMI部分之间高速通讯的HPI接口,实现了在不打断DSP正常程序运行下DSP与嵌入式x86平台的高速、高可靠性、低功耗数据传输及在线修改DSP存储器的数据等功能。更多还原

【Abstract】 Following the shaped huge interconnected power grid and the impeling power market reform, it needs the system to monitor the status of wide area power network. As a result of this situation, a wide area measurement system becomes ture. As the fundamental external measurement unit, the performance of PMU based on GPS takes a direct effect on the precision of the system.A phasor measurement unit with free scaled synchronized time mark (Novel PMU) has been developed. The novel PMU is composed of frequency auto-adapted equal interval sampling module, synchronized time-mark generating module, core module based microprocessor, and resolved the problem of uncoupling treatment to "time-synchronized" and "frequency-synchronized" sampling. There by the synchronized time-mark and its synchronization model can be marked freely, the full circle sampling data can be automatically orientated and intercepted (no frequency spectrum leak out) to make high precision DFT calculation. The calculation phasor offset caused by synchronized time-mark offset can be precisely corrected with simple linear method. The precision of phasor measurement under three modes (the first, middle and last sampling point) of time-mark synchronization has also been simulated. The hardware of the novel PMU is investigated in depth, the corresponding circuit is worked out, all functions are tested and debugged, all functions that need to be realized are partially tested in the laboratory. In the paper, HPI interface for the communications between DSP and MMI in the phasor measurement unit is designed through which DSP and embedded x86 systems can communicate and renew data in the DSP memory quickly, reliable with low power while DSP works without being interrupted.更多还原