【作者】 刘曲波；

【导师】 李红斌；

【作者基本信息】 华中科技大学 ， 电工理论与新技术， 2007， 硕士

【摘要】 相比于传统的电磁式互感器,电子式互感器以其体积小、重量轻、绝缘方便、频率响应范围宽、暂态响应范围大、测量精度高、安全可靠性强、成本低等众多优点正越来越受到人们的重视。为了使电力系统自动化程度更高,国际电工委员会联合全球一些重要的电力设备制造商制订了变电站通讯网络及系统(Communication Network and Systems in Substation)系列标准――IEC61850。其中IEC61850-9-1/2定义了电子式互感器的数字接口,即合并单元(Merging Unit)。合并单元将一次传感设备的电压、电流瞬时信号数字化后,按照IEC61850-9-1规定的帧格式组帧打包,以IEEE802.3以太网传输协议上送至以太网,供继电保护、计量质量分析、PMU设备使用,从而实现过程层的传感设备与间隔层在通信上的无缝联接。本文结合IEC61850对电子式互感器数字接口(合并单元)的模型进行了研究,并提出了一种基于DSP+FPGA的合并单元实现方案,其中DSP负责信号的采集和组帧打包,FPGA负责整个合并单元的时序控制。合并单元从功能上划分为同步高速数据采集模块和过程层通讯模块。在同步高速数据采集模块中,介绍了使用FPGA配合DSP控制A/D转换芯片AD7656对12路电流、电压信号进行采样的方法,并提供了一种基于FPGA的GPS时钟同步方案。在过程层通讯模块中,介绍了使用DSP通过嵌入式以太网控制器LAN91C111将按照IEC61850-9-1打包好的电流电压数据以IEEE802.3帧格式发送至以太网的方法。论文的最后对全文进行了总结,并提出了下一步工作的方向,除了将对合并单元的电磁兼容性进行改善设计外,还需要在其结构方面进行必要的改进,以方便其与不同形式的电子式互感器的接口要求。更多还原

【Abstract】 Comparing with traditional electromagnetic transformer, people pay more and more attention to electronic transformer, because of its various advantages such as: small shape, light weight, easy insulation, wide frequency response range, wide transient response range, high measure precision, dependable security, low cost and etc.For high degree power system automation, IEC and some leading power equipment manufacturers finalized the protocol IEC61850. The part IEC61850-9-1/2 defines the electronic transformer digital interface, the merging unit (MU). For expedite communication between the transducer in process level and bay level, MU samples the voltage and current signal, packets them into digital frames and sends them to Ethernet for relay protection, quality analysis, PMU equipments.The paper researches the electronic transformer digital interface model based on IEC61850, and designs a DSP+FPGA MU shame. DSP takes charge of data acquiring, framing and packing; FPGA is responsible for sequential control. Functionally, MU can be divided into two parts: synchronous high speed data acquisition module and process level communication module. For synchronous high speed data acquisition module, paper introduces the method how to use FPGA cooperating with DSP to control AD7656 to sample all 12 voltage and current signals, and how to realize GPS based clock synchronization. For process level communication module, paper introduces the method how to use DSP to control embedded Ethernet controller LAN91C111 to packing the voltage and current information into frames in the standard defined in IEC61850-9, and how to send the frames to Ethernet.At the end, the paper looks forward to the following work. In next vision of MU, it not only needs to improve the electro magnetic compatibility, but also to improve the MU structure, so as to expediently interface to all kinds of electronic transformers.更多还原