What do group reactive power compensation and split phase reactive power compensation mean

The low-voltage compensation capacitor cabinet is equipped with common compensation (three-phase) capacitors and separate compensation (single-phase) capacitors. During the capacitor switching process, the common compensation capacitors are put into operation first, followed by the separate compensation capacitors. This is because when distributing the load, efforts are made to ensure that the three-phase loads are as balanced as possible. For a single transformer, it will not only use the load of one phase, so the load with the largest capacity is the three-phase load, and the difference between each phase is the smaller load. Therefore, the majority should be common compensation, and a small part should be separate compensation. This is more reasonable and economical (separate compensation is more expensive than common compensation), and common compensation compensates the same capacity simultaneously for all three phases, while separate compensation calculates the compensation capacity for each phase separately and compensates them respectively.

Difference:
Complete complement: Three-phase capacitor, compensates for the three-phase circuit simultaneously.
Partial complement: Single-phase capacitor, compensates for the single-phase circuit.

The advantages of the common compensator:
Simple to control, low in cost, good in reliability, convenient for maintenance and repair. It has low requirements for the compensation controller.

Common deficiencies:
In the case of three-phase imbalance, compensation is impossible, or even more imbalance occurs after compensation.

The advantages of the compensating element:
It can handle unbalanced situations and has high compensation accuracy.

The shortcomings of the compensator:
High price, complex control, complex wiring. Difficult to maintain and repair. High requirements for the compensation controller.

In fact, in the case of three-phase unbalance, both common compensation and separate compensation are possible. For example, if the three-phase power factor is 0.53, 0.67, and 0.71 respectively, then for the part above 0.71, common compensation can be used to solve it. For the other parts of the two phases, the reactive power required can be compensated through separate compensation.