Research on power quality control of coal mine power grid

In this study, a comprehensive compensation scheme of injection-mixed filter and magnetic control reactor is presented. In accordance with the size of the load of the coal mining area, the reactive power is compensated by the magnetic control static var compensator, which is composed of the MCR and the fixed capacitor group. Using the injection-hybrid filter reduces the harmonic distortion rate of the coal mine power grid and eliminates the odd harmonics generated by the MCR itself. The simulation experiments show the power factor of the substation that is approximately 0.9709 and harmonic current distortion rate is approximately 0.35%. Therefore, injection-type hybrid-active power filter and magnetically controlled reactor comprehensive compensation scheme improves the power quality as well as the reliability of a coal mine power supply system.