Research On Key Technology Of Intelligent Power Supply System For Large Mine Ventilator

The mine’s main ventilator is known as the "lung" of the mine.It has served the entire mining area from the time of production to the end of mining.The elderly have been in the mine for more than 70 years and are generally at the edge of the mining area,which is far from the mine ground substation.The main ventilator has a long power supply line,and has a large voltage drop at start-up and a reduced starting torque,resulting in prolonged start-up time,increased motor losses,increased faults,and reduced life.At the same time,the setting of relay protection parameters of the power supply system is calculated and set according to the longest service period,that is,the maximum load,and it is extremely unfavorable for fans to operate for light and medium loads for several decades.Based on the above two issues,this article attempts to start with the fan power supply monitoring system,is limited to asynchronous motor without inverter supply,explore two software algorithms,one is to increase the starting torque through reactive compensation,the second is based on historical data given ventilation Machine real-time dynamic protection scheme.For this purpose,we mainly did some work:1.Firstly,the composition of the power supply system of mine ventilator,the type of fault,the setting scheme of relay protection,and the performance characteristics of the universal reactive power compensation controller are discussed,and the key links of the subject research are positioned.2.Based on the general power supply monitoring system without variable frequency asynchronous motor,the reactive power compensation software control strategy is discussed in detail,mainly including the compensation theory,“8421”compensation scheme and fuzzy control scheme,as the theoretical basis of the software algorithm.3.Based on the general fan power supply monitoring system,discussed in detail the dynamic protection prediction strategy,including dynamic protection theoretical basis,simulation research and other aspects,given the theoretical basis for dynamic protection software algorithms.4.Based on reactive power compensation software control strategy and dynamic protection software prediction strategy,the implementation methods of two types of strategies are discussed in detail,including software framework,system main flow,reactive power compensation switching process,and dynamic protection process.An online PC monitoring system was designed.The theory and method of reactive compensation software algorithm and dynamic protection software algorithm were verified in the laboratory.Based on the mine ventilator monitoring system,the on-line reactive power compensation software algorithm proposed in this paper is compared with the traditional reactive power compensation controller,eliminating the need for a dedicated reactive power compensation controller and saving multiple high-voltage switches,which not only saves system construction costs.,And save space.The on-line dynamic protection software algorithm proposed in this paper can provide the real-time operation conditions of the equipment according to the history data of the ventilator,which greatly improves the safety and reliability of the ventilator and is important for improving the comprehensive benefits of the mine.significance.The conclusion of this paper has some reference significance for the reactive power compensation of high voltage power supply system and the dynamic protection of large-scale equipment.