Several methods of increasing power factor by high voltage capacitor compensation

First of all, we must understand why we should increase the power factor: in the operation of the power grid, the greater the power factor, the less the apparent power in the circuit will be used to supply the active power reactive power. Appropriately improving the power factor of the user can not only fully utilize the production capacity of the power supply and power supply equipment, reduce the line loss, improve the voltage quality, but also improve the working efficiency of the user's power equipment and save energy for the user.

The methods for improving the power factor through high voltage capacitor compensation are:

1. High-voltage centralized compensation is to install the shunt capacitors in the power supply direction of the high-voltage power distribution station. However, this high-voltage capacitor compensation method can only compensate the reactive power on all lines in the power supply direction, and the power supply direction is behind the factory line. The reactive power is not compensated. Therefore, the high-voltage capacitor compensation method has a poor economic effect. However, this compensation compensates the power system and this compensation is reasonable. Moreover, due to the concentrated compensation, it also has the advantages of less initial investment, easy operation and maintenance, and adjustment of the capacity of the capacitor according to the actual load. This high-voltage capacitor compensation method is mostly used in large-scale substations.

2. Low-voltage dispersion compensation is to disperse the shunt capacitors in the vicinity of each electrical equipment. This high-voltage capacitor compensation method can compensate the reactive power of all high-low voltage lines and substation transformers in front of the installation site, so its The compensation range is large and effective. However, the equipment of this compensation method has a large investment and is inconvenient to maintain. This type of compensation is mostly used in larger buildings.

3. Low-voltage group compensation Low-voltage group compensation is to install the parallel capacitors on the low-voltage busbar of the substation. This compensation method can compensate all the transformers and the user's high-voltage distribution lines in front of the low-voltage busbars of the substation. The reactive power has a larger compensation range than the high-voltage centralized compensation, but is smaller than the low-voltage dispersion compensation. Its advantages and disadvantages range between high pressure centralized compensation and low pressure dispersion compensation. This type of high-voltage capacitor compensation method is mostly used in construction communities or small and medium-sized factories.