Application of reactive power compensation for underground low-voltage asynchronous motor in coal mine
First, the industry situation
The underground coal mine asynchronous motor is used in a wide range and is the main reactive load of the underground power grid. Because of its low power factor, it greatly increases the cost of electricity consumption of enterprises, and at the same time reduces the utilization of equipment power and increases the loss of the line. At present, the power factor of coal mine underground power grid is usually adopted by capacitor compensation.
Second, the necessity of reactive power compensation in the coal industry
The reactive power consumed by the underground asynchronous motor is mainly supplied by the power system, so that the underground power supply line delivers a certain reactive current while delivering a certain reactive current. As a result, the total apparent current increases. The network loss of each level of power grid is also increased accordingly. Although the central ground substation of coal mines usually adopts high-voltage concentrated reactive power compensation device to improve the power factor, it can only compensate the reactive power on all the lines that supply power to the bus before the bus. . The power grid after the busbar, that is, the load direction, does not receive reactive power compensation, and the underground low-voltage power supply network is longer. The use of ground concentrated reactive power compensation still cannot reduce the line loss of the low voltage power grid. Therefore, it is necessary to compensate the asynchronous motor for local reactive power. The low-voltage capacitor bank is connected with the motor through the control, the protection device and the motor, and the random compensation of the switching is suitable for compensating the reactive power consumption of the motor to supplement the excitation and reactive power. Moreover, the configuration is convenient and flexible, and the compensation capacity does not need to be adjusted frequently. Low investment and easy installation (1).
Third, the choice of ARC power factor controller
Ankerui's ARC power factor controller strictly follows the requirements specified in DL/T597 "Low-Voltage Reactive Power Controller Ordering Technical Conditions" and JB/T9663 "Low-Voltage Reactive Power Automatic Compensation Controller". According to the specific compensation needs and load characteristics of the coal mining industry
Fourth, the coal mine industry reactive power compensation selection
According to the characteristics of different load times or load changes of the power load of the coal mine industry, it is recommended to use parallel capacitors for fixed compensation for the power load that does not change or change slowly. The ARC static output controller is selected; Different operating conditions, you can choose the controller that uses ARC dynamic output. The ARC-12F or ARC-16F sub-compensation controller is selected according to the serious imbalance of the three-phase load.
