There are two methods for power capacitors as compensation devices: series compensation and parallel compensation. Series compensation is to connect the capacitor directly to the high-voltage transmission line to improve transmission line parameters, reduce voltage loss, improve its transmission capacity, and reduce line loss. The capacitor of this compensation method is called a series capacitor, and is applied to a high-voltage long-distance transmission line, and the power unit is rarely used. Parallel compensation is to connect the capacitor directly to the same circuit on the compensated device to improve the power factor. The capacitor used in this compensation method is called a Shunt Capacitor, and the power company uses this compensation method. There are usually three ways to install the capacitors depending on where they are installed.
1. The centralized compensation capacitor group is installed in the 6~10kV busbar of the enterprise or local total step-down substation, which is used to improve the power factor of the whole substation, so that the reactive power in the power supply range of the substation is basically balance. It can reduce the reactive power loss of the high voltage line and improve the power supply voltage quality of the substation.
2. Group compensation The Capacitor Banks are respectively installed in the low-power workshop or the high-voltage or low-voltage busbar of the village terminal transformer substation, also called dispersion compensation. This approach has the same advantages as centralized compensation, with only the reactive compensation capacity and range being relatively small. However, the effect of group compensation is more obvious, and it is more common.
3. Local compensation The capacitor or capacitor assembly is placed near the asynchronous motor or inductive power equipment to perform reactive compensation on the spot, also known as individual compensation or individual compensation. This method can not only improve the power factor of the power supply circuit of the electrical equipment, but also improve the voltage quality of the electrical equipment, which is very suitable for medium and small equipment.
