Research On Integration Of Multimode Low-voltage Power Line Communication

Using power line as the medium of information transmission can effectively take advantage of the power system, which has a broad application space under the background that the energy Internet is developing in the country; Power line carrier communication (PLC) and Two Way Automatically Communication System (TWACS) are two kinds of power line communication technology which have been researched by many experts. At the low voltage side of distribution transformer, PLC signals transform fast, but its ability to guard against interference and attenuation is poor. TWACS is just opposite to PLC.According to this, this paper designed an integration system with multimode power line communication which are low-voltage PLC and TWACS, and made the circuit with integration communication function. In the integration system, the modulation and demodulation of PLC and TWACS signals is operated by software in MCU. PLC technology is mainly used in data transmission. Path search methodology that based on TWACS signaling improves the efficiency of PLC dramatically. So the effectiveness and reliability of low-voltage power line communication are guaranteed.Paper’s main work is:1) This paper set up the model of TWACS at low voltage side of distribution transformer, and analyzes the properties of the transaction system on Matlab/simulink. On that basis, this paper design down forward TWACS detection scheme by amplitude/time switch.2) Based on the research results of low voltage PLC, this paper has been developed based on ATmega88 operation at the same time, realize power line communication module, and test and verify the power line of Taiwan area power frequency communication performance.3) To meet the demand of relay route optimization of PLC, design based on TWACS reliable transmission downlink relay instruction combination optimization path of the PLC scheme, can greatly improve the PLC relay transmission performance, and further analysis through TWACS and PLC solution for the communication "isolated island" problem.In this paper,, since by one MCU fusion arithmetic to realize power line power frequency and carrier communication, for the technology in the remote meter reading, distributed power monitoring, enterprise scale applications in the field of energy efficiency monitoring platform has created favorable conditions.