Wind turbine drive system based on CAN bus temperature monitoring node design

Wind turbine drive system based on CAN bus temperature monitoring 2018 - node design 09 - 29 Wang Dongmin Li Hongyi ( Its technical institute, shandong Tai’an City 271000) Abstract: this paper wind turbines transmission part of the need for temperature monitoring of the actual application of CAN bus is a multiplex heat resistance temperature measurement data acquisition node, the module of hardware, software to design scheme is presented. Key words: CAN bus; Wind turbines. Temperature measuring 1 introduction of wind turbine drive system mainly includes the main shaft, gear box, coupling and other rotating parts, in the wind turbines in the operation of the rotating parts will produce a certain quantity of heat, if not timely heat dissipation, long run will inevitably lead to component temperature rising and damage, affecting the normal operation of the unit. Of wind turbine drive system, therefore, should take the necessary temperature monitoring, timely and effectively send out due to the heat generated by the rotation, to ensure the safe operation of the stability of wind turbines. 2 can bus summary of wind turbine drive system temperature monitoring temperature monitoring of wind turbine drive system components usually adopt industrial platinum resistance sensor Pt100, mainly monitoring of main shaft and the main bearing temperature, growth box, front and rear bearing temperature measuring point, etc. Pt100 platinum resistance, single chip microprocessor, CAN bus controller and transceiver constitute temperature monitoring node, the node and other nodes wind turbines joint articulated on the CAN bus, and then through the CAN network interface card will monitor information transmission to realize the centralized monitoring a SCADA system, realize the fully digital information transmission. The system principle block diagram is shown in figure 1. 3 can bus platinum resistance temperature monitoring node design 3. Hardware as shown in figure 2, Pt100 platinum resistance measurement to wind turbine drive system components of the multiplex temperature signal switch into A/D conversion chip MAX197, temperature signal into analog signal amplification and converted to the digital quantity with 8-bit microcontroller P8XC592 with CAN bus communication controller, simplifies the Pt100 platinum resistance temperature measurement hardware and software design. CAN bus is a temperature measurement node with superior physical media of the monitoring system, CAN bus control TXD derivation and RXD input output end, according to the need to match the physical connection and bus level, using the transmission speed is larger and the bus driver ability strong CAN bus interface chip 82 c250, and add 6 n136 photoelectric isolation, anti-interference ability, bus terminal installed matching terminal apparatus, avoiding interference signal on the transmission line terminal reflection of the original signal. 3. Software design of upper monitoring system of unified coordination, various commands, and receive from the scene of the data, information, alarm, etc. Temperature measurement node receives the command and send the result to the CAN bus operation, from the analysis of SCADA system, display and processing. Temperature measurement module mainly complete upper system commands, design of software block diagram as shown in figure 3. Initialization program implementation in P8XC592 single-chip microcomputer and its periphery circuit reset, set the CAN bus baud rate, and set the CAN controller command register, etc. References [ 1] WuKuanMing. Field bus technology application Ed. [ M] 。 Beijing: Beijing university of aeronautics and astronautics press, 2004 ( 6) 。 ( 2] Xian-hui Yang. Field bus technology and its application [ M] 。 Beijing: tsinghua university press, 1999 ( 6) 。 ( 3] Yun-tao rao. Principle and application technology [fieldbus CAN M] 。 Beijing: Beijing university of aeronautics and astronautics press, 2003 ( 6) 。 Source: the electronic technology and software engineering issue 24 2017