低压电力线载波通信的信道模型和模拟试验系统电力电子与电力传动专业论文.docxVIP

哈尔滨 哈尔滨工业大学工学硕士学位论文 PDF PDF 文件使用 pdfFactory Pro 试用版本创建 HYPERLINK / Abstract Nowadays the low-voltage power line (LVPL) is widely spread in virtually all households, which makes it of great advantage in room automation systems. However, as the power transmitting line, the communication environment of LVPL is very complex, especially for its impedance unstableness, signal attenuation and noise, which make the communication quality varies greatly with times and locations, and make it difficult to develop and test lower-voltage power line carrier communication (LVPLCC) equipment. Considering the drawbacks of LVPL in communication, this paper proposes and establishes an experimental system to simulate the LVPLCC environment in order to provide a new approach to the development and experiment for LVPLCC products. Based on the analysis of the communication environment and channel model of LVPL, this paper first explores the close relationship between the LVPLCC’s transmit characteristics and the frequency of signals, and uncovers the frequency responses of the characteristics. Further, this paper establishes the LVPLCC simulating system, of which the fundamental simulating units are constructed with passive resistors and capacitors, the variant topological configurations are implemented by the computer-controlled relays, and the noise generator is in the form of virtual instrument. All the modules of the system apply a unified interface so that they can be interchanged and added freely. The 220V power supply is elaborately processed to ensure the normal operation of the attached devices. Thus the system is not only able to comprehensively reflect the channel characteristics of the LVPLCC, but also of great conveniency, flexibility and extensibility. The testing data show that the system can implement the typical transmit characteristics of LVPLCC. Controlled by the computer, the system can produce variant characteristics of input impedance, attenuation and noise, and is