低压电力线载波通信综合实验系统的研究与应用控制理论与控制工程专业论文.docxVIP

哈尔滨工业大学工学硕士学位论文 哈尔滨工业大学工学硕士学位论文 - - II - Abstract Low-voltage power line carrier communication (PLCC) has the unique advantages of widely distributed lines, easy using, and so on. It has been widely used in remote meter reading and intelligent buildings and other fields. But, as power transmission lines, Low-voltage power line channel has complex structure, large signal attenuation, strong interference, and the impedance characteristics, attenuation characteristics and noise characteristics of power line will have dramatic changes when the place and time change. This wicked channel environment impacts the data transmission greatly, and it also brings a lot of difficult to the PLCC research. Based on the comprehensive analysis of PLCC channel’s characteristics, this thesis will establish a set of integrated experimental system for low-voltage PLCC with both simulation software and hardware to provide a credible simulating field for the reaserch and test of PLCC product. Based on the deep research of the PLCC channel, this thesis proposes the method simulating the channel of low-voltage power line based on the multi-path transmission model. The system can connect different channel simulation unit and the purified power supply freely by the relays controlled by the microprocessor, to set up typical simulting channel topology. Based on the design idea of virtual instrument, this thesis sets up a software for the automatic test of the simulating channel characteristics by using the general testing equipments supporting the VISA standard, and the testing result verifies the efficiency of the channel simulation.The software for the simulating transmission experiment of the carrier communication is also developed, combined with the testing equipments and the specially designed test unit, it achieves the carrier signal’s transmission through the simulating channel provided by the experimental system, and provides important basis for the development of communication product.