Research on The Operation Control Strategy of Local Ventilation Emergency Power Supply in Mine

As the emergency power supply of underground local ventilator, the operation of energy storage device is an important link to ensure the stable and reliable operation of coal mine power grid. This paper puts forward the mode switching control strategy of energy storage device according to the common fault conditions of underground local ventilator power supply system. The islanding detection method which based on third harmonic injection is used to judge whether the energy storage device is in islanding operation state or not. And through simulation experiments, it is verified that the island detection technology used in this paper can effectively determine the operating state of the emergency power supply and realize the smooth switching of the operating mode of the energy storage device.