| Many mine hoists have huge energy consumption and play a decisive role in the normal operation of mines.Because the hoist will generate a large amount of braking energy during the frequent operation of the upper and lower,in the past,a high-power resistor is incorporated into the DC bus to consume this part of energy.Not only emits a lot of heat to control the temperature of the control room to affect the control stability,but also caused a great deal of energy waste.In order to achieve the goals of energy saving and consumption reduction and green development,the energy feedback technology for mine hoists has become one of the research hotspots for many companies and departments.Currently,energy-saving technology for hoister feedback is divided into two major research directions:super capacitor energy storage energy-saving system and energy feedback and grid-connected energy-saving.Energy feedback and grid connection will cause harmonic pollution,the super capacitor energy storage and feedback system does not exchange electrical energy with the grid,and it can recycle the braking feedback energy of the hoist and improve the energy utilization rate.Therefore,there are many researches on the application of super capacitor energy storage feedback technology in mine hoists.Through learning and studying the energy storage feedback system,it is found that when the DC bus voltage fluctuates,the controller cannot accurately control the control amount,and reduces the energy storage release efficiency of the super capacitor,thereby reducing the energy saving efficiency of the energy feedback system.To solve this problem,this paper designs a fuzzy control optimization scheme based on the traditional bidirectional DC-DC converter energy storage system.Firstly,the analysis of the energy flow state and operation state of the mine hoist,and the derivation of the parameters of various basic devices of the energy feedback system.Secondly,the traditional bi-directional DC-DC converters are studied in detail.The given instructions for adjusting PI control are selected as the optimization method.After the theoretical verification,two fuzzy controllers are designed.Finally,the AC voltage fluctuation and super capacitor current of the mine hoist are used as real-time sampling values,the two fuzzy controllers added to the design dynamically adjust the DC bus reference voltage on-line according to two sampling values,through the optimization,the controller can control the control quantity more accurately,improve the charging and discharging efficiency of the super capacitor,and increase the energy utilization rate of the mine hoist energy feedback system.According to the control scheme of this paper,a MATLAB/Simulink simulation and simulation experiment platform was built.The simulation and experimental results show that the research scheme of this paper can effectively increase the absorption and utilization of braking energy of the mine hoist when the voltage disturbance of the power grid causes the DC bus voltage to fluctuate. |
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