| In recent years,the expansion of production scale of coal mine enterprises has resulted in the increase of coal mine power load.At the same time,a large number of nonlinear loads appear in the power supply system,which is more likely to cause power quality problems and cause hidden troubles for the economic and safe operation of coal mining enterprises.In this paper,the control strategy and application of coal mine shunt active filter based on improved Model Predictive Control(MPC)and Carrier Phase-shifted SPWM(CPS-SPWM)are studied.In this paper,discusses the basic principle and structure of the shunt active power filter,in view of the existing power quality problems such as the serious problem of mine power supply harmonic,determines the cascaded H bridge parallel active power filter system topology structure,and combined with multilevel inverter,the simulation results show that the structure of harmonic suppression and reactive power compensation effect is good.Effective implementation of the shunt active power filter harmonic detection and the reference current is generated two link,the ip-iq harmonic detection algorithm,improved the control strategy of the MPC,and put forward based on the CPS SPWM control strategy,the control strategy can better complete five times and seven times harmonic compensation,as well as within the system and and equalizing capacitor voltage control.Based on the control strategy,the hardware system structure of cascaded H bridge active power filter applied to coal mine power supply with TMS320F28377D as the core is designed,and the hardware parameters and corresponding software are designed.The experimental system is set up and tested in yanghuopan coal mine.The results show that the control strategy can effectively achieve harmonic suppression,the total harmonic distortion rate is reduced from 4.72%to 1.83%,it has theoretical and practical significance to improve the power quality of coal mine. |
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