Application of single-chip microcomputer in hydro-generator speed monitoring device Li Shengmin, Sun Xuxia, Zhang Weina, Institute of Automation, Xi'an University of Technology, Xi'an 710048 machine, residual voltage measurement, single-chip serial display and method for controlling corresponding equipment according to different speeds 1 Introduction The monitoring device is used in the protection circuit of the small and medium-sized hydro-generator, as a device for monitoring the change of the rotational speed of the hydro-generator and issuing a corresponding control signal, that is, when the rotational speed of the generator reaches 8 of the rated rotational speed, the de-excitation switch is input; When the rated speed is 9 degrees, the generator starts to energize; and if the speed reaches 14 times of the rated speed. The unit is shut down urgently and is cracked with the power grid; when the generator speed is lower than the rated speed of 3 during the stop, the brake can be put into the front market and the corresponding device. But either there is no speed or the price is high. To this end, we have developed a cost-effective speed monitoring device suitable for small and medium-sized water wheel hairpins. 2 System principle The device utilizes the residual voltage of the generator to become a square wave signal through a voltage comparator, and the square wave signal It is sent to the bamboo mouth of the single-chip microcomputer, and the timer is set to the external counting mode; D, set to the timing working mode, 1 and the software cooperate to form a 1-second timer, and the counting pulse in the counter is read out when the timing time is up. That is, the frequency of the generator voltage is 1 second. The number of pulses of the generator is based on the frequency of the total mountain generator. And sent to the serial port 5 hall display system composed of 3 systems of hardware components of the hardware part of the system is basically divided into two parts, namely the generator residual voltage frequency measurement circuit and the microcontroller circuit.
1 residual voltage frequency measurement circuit We know that before the generator is excited, its residual magnetization can generate residual magnetic voltage. If this voltage is converted into a square wave signal by a voltage zero-crossing comparator and supplied to the single machine for counting, it can be processed accordingly. Complete the control of the speed and display, circuit 2. It has been used as a low-voltage AC signal from the generator-side electric carometer to its residual voltage through the transformer. After passing through the voltage zero-crossing comparator, a square wave signal is formed and sent to the counting end of the single-chip microcomputer. The frequency measurement process is performed by a single-chip microcomputer. The conventional frequency measurement method is to install a sensor on the motor shaft, and the installation of the sensor is not convenient. Need to cooperate well with the mechanical aspects. The installation accuracy is difficult to guarantee, and some sensors are also costly; the residual voltage measurement method eliminates the rotational speed sensor, and the cost of the system is greatly reduced. And do not need too noisy calculation methods. As long as the microcontroller accurately reads the number of pulses per second of the counter. The frequency of the residual voltage. After the conversion of the following formula, it can be changed to the generator 2 speed signal of the chipper processing and the display circuit of the 892051 chipper selected by the device, which is cost-effective. It has 1 string of interrupts. Two external interrupts and two external timing liver numbers interrupt 5 interrupt sources. There are two 16-bit timers in the internal and the implementation of the line, and the completion of the umbrella can be based on the system. We designed a circuit of 3, in order to improve the device's timer buckle, in the program there is a fly or crash reliability, to prevent the phenomenon of crashes, plus a watchdog, automatically reset the device as a water wheel The generator is a salient pole low speed generator. It is required to display the generator, the actual speed is the synchronous speed of the rotating magnetic field of the generator, and the 4-bit 0 can meet the obvious requirements. In order to make full use of the resources of the 89, 2051 single-chip microcomputer, the serial display 2051 single-chip microcomputer, 3.03.1 When operating as a display port, it should work in mode 0. We use an external 4 748164 as the static display port of 4-bit B0. The 8-bit segment code to be displayed is sent out serially by 0, so that the main program can be improved without having to scan the display. The efficiency of scooping should be noted here is the order in which the serial port outputs a byte number. It is the key to the correct cooperation between the serial port and the 743164. If the glyph code makes the segment code 33, it is 0. The segment code 1 is sequentially treated as 7 bits, and the shift register is registered and the complete shape code is received. Sand loses 15 correct glyphs, and the scheme is to adjust the glyphs. Another scheme is called the whole 7464 and 0 display wiring. The software design software of the 4 system is equipped with hardware to complete the pulse counting and the speed display and control of the main program to complete the calculation and display of the measured frequency of the generator frequency. In the program, the number of pulses in the counter is read in 1 second, and sent to the corresponding unit. When reading the counter value, the fly reading method is adopted to read the current value of the counter. Main program flow 4.
5 Conclusion This book has been run in the dynamic control system of the hydropower station unit, and its effect is good. The device has the characteristics of simple structure, high precision and reliable performance, and has a good application prospect.
0 machine initialization solid 4 main program box 1 He Limin. MCU application system design. Beijing Aerospace University Press, 1990.
2 Li Guangdi. The basis of single-chip microcomputer 1. Beijing University of Aeronautics and Astronautics published 3 Chen Yuquan. The practical technology of the single chip microcomputer. Electronic Industry Press, 4 Li Weiren. The principle and application of single-chip microcomputer 1. Tsinghua University Press, 1989.
Newsletter Rockwell Automation and Shanghai Duogang Collaborate to Establish Automation Lab Rockwell Automation, the largest industrial automation supplier in North America, today unveiled the Baokang Rockwell Laboratory jointly established by Shanghai Baosteel Group. The general manager of the Rockwell Automation Asia Pacific region in China and the important leaders of Baosteel participated in the event. The laboratory staff performed on-site operation for the guests. Rockwell's generation also brings electronic manufacturing to you. (1) Cutting the traditional manufacturing and management mode to adapt to the new economic era. Rockwell Automation is the largest automation supplier in North America, in automation The field of electronic computer software integrated circuit manufacturing has high international influence and comprehensive strength. Its industrial automation control products have broad application prospects in Shanghai Baosteel's cold ritual steelmaking power plant steel pipes and other units. In the progress of automation cooperation, the laboratory donated about 1 million yuan by Rockwell Automation. Control equipment communication system and computer software to train the shortage of talents in Baosteel's computer electrical instrument technology. Cooperate to complete relevant scientific research and improvement and maintenance projects, and improve the ability of Baosteel engineers and technicians to design and develop Rockwell Automation products.
The laboratory uses a transparent enrichment factory as a model to showcase the advanced industrial control products and network technologies of Rockwell Automation, including the latest controller of 0 001, the computer monitoring software of 5 series controllers, and the arrest of 32 Jia 0 1 series programming and configuration software inverter and 30 marriage, 0 lamp adapter and network technology of the computer communication system using Ethernet control network and equipment network In order to fully reflect Rockwell Automation control technology, it is convenient for personnel training and technical test. The laboratory is equipped with a variety of model equipment, which is included. 7 process test model, temperature field mode converter test mode, fire 1 record monitoring and adjustment, cast type steam moving processing model elevator test model excavator model and driving model, etc., both simple logic control, and Complex sequential control and interlocking control; both simple single-variable loop regulation control and complex multi-variable time delay coupling control; both electrical control and pneumatic control from China High-tech Industry Guide, 2000
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