Study On Hybrid Medium Communication Techniques Being Used On Modular Inverters

Modularization is a development direction of inverters design, thecoordination works and control of many modular inverters is based on reliabledata transmission. The task is the sub task of the inverters control and topologyfor a new high frequency and mini-type power by natural science fund(50237020), we focus on the networks communication of the modular inverters.On the characters of the modular inverters, in this paper, a kind of hybridmedium communication mode is applied, that is based on CAN (controller areanet) bus and wireless Ad Hoc networks. First, the hardware of the CAN businterface is designed, the CAN bus communication is realized by using twistedpare line as the communication medium, and the communication task in thismonitor system is satisfied. After that, the Ad Hoc networks communication isstudied, which is based on putting the modular inverters on the terminals. Thehardware interface of DSP LF2407A and transceiver nRF905 is designed anddebugged, and the wireless communication is realized. As the study on MAC(medium access control) protocol in Ad Hoc networks, in this paper, a newimproved protocol based on frequency hopping spread spectrum is presented,and there is an analyzes on performance by simulation.The study on theory and experiment may apply on modular inverterssystem based on inserted controller. In the networks communication of themodular inverters, the communication mode could be chosen on need, or whilea kind of communication mode is broken, the other communication could beused then, this can make sure the network system works normally. As the studyon MAC protocol, an independence sub-channel is used based in the HRMAprotocol to transmit control message, and the capability of channel reusing isimproved.Study results indicate that the application of hybrid communication modecould make use of the merits of wireless communications and wirecommunications, make the modular inverters communications more flexibleand credible. On the study MAC protocol, the slow frequency hopping spreadspectrum in multiple channel could make use of the limited channel resource,release the influence of the hidden terminals and the exposed terminals.