【作者】 董莉；

【导师】 田远富；

【作者基本信息】 四川大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 大型、重要电器设备的网络化管理是网络技术的新领域，如何有效地实现电器设备与网络之间的通信是这一领域的热点。电力线载波通信以电力线为载体，与其它通信方式比较有着特殊的优势。传统的电力线载波通信在通信质量上的缺陷使其不能适应电力发展对通信的要求。许多新的通信手段，如微波、光纤等，虽然性能优越，但投资巨大、建设周期长。若能将扩频技术用于电力线，提高电力线载波通信质量，使现有电力线资源物尽其用，从而寻求到一种高性价比的电力系统通信方案，这便能很好的解决电力系统中的信道紧缺问题，带来直接而客观的社会经济效益。本科研项目便是基于这一出发点，开发能实现在电力线上传输数据的扩频数字传输系统。 本设计选择采用的扩频技术为直接序列扩频技术，它解决了信号在电力线这样恶劣的通信环境中的传输问题；选择采用窄带干扰自适应抑制技术，该算法速度快、噪声和干扰抑制能力强，从而克服电力线的恶劣环境对接收信号的影响。 本文首先就设计中选择采用的直接序列扩频技术、以及在频域中实现直序扩频信号中多窄带干扰抑制的自适应算法的基本原理做了分析。随后详细论述了系统的硬件设计和软件开发。其中硬件设计包括PL2101电力线节点、窄带干扰自适应抑制系统的实现。软件开发包括单片机汇编程序的编写和PC机与单片机通信程序的编写。最后，对该系统进行了调试和性能分析。调试结果说明，本系统性能优越、性价比高，可用于通信可靠性要求较高的场合，如电网自动化、配网自动化以及自动抄表系统等。更多还原

【Abstract】 The administer of big model and important electrical equipment in network is the new field of network technique . How to realize effectually the communication between electrical equipment and network is a focus of this field . Traditional power line carrier communication has some shortcomings on communication quality, which let it doesn’t adapt to the dement of the power developing. Although many new communications means, such as microwave, optical fiber, etc, perform satisfactorily, the investment is tremendous and the construction period is long. If we can apply the spread spectrum technique on power line, improve the quality of the power line carrier communication, make the better use of the existing power line resource, then we can resolve the channel-lacking problem and bring direct and considerable social economic benefit. This scientific research project bases on this starting point, develops the spread spectrum digital transmission system which can accomplish the digital transmission on power line.The design select the direct sequence spread spectrum technology, which resolve the problem of the signal transmission in such adverse communication circumstances as power line; select the spectrum domain adaptive filtering technology, which has characteristics of high speed and powerful rejection for noise and interference.The paper firstly analyses the fundamental principles of the direct sequence spread spectrum technique, the arithmetic in the frequency-domain by using the technology of the spectrum correlation adaptive filter. Secondly, the hardware designand the software development are thoroughly discussed. The hardware design includes PL2101 power line node, realization of narrow-band interferences in direct sequence spread spectrum signal using frequency-domain algorithm. The software development comprises the compile of the microcontroller’s assembly program and the compile of the communication program between the computer and the microcontroller. At last, the debugging and the performance analysis are conducted. The results show this digital transmission system performs superiority, pays cheaply. It can be used on the occasion of data transmission rate moderate , communication reliability demand high, such as power network automation distribution network automation and remote automatic metering system and so on.更多还原