There are several factors to consider, including the power factor of the system, the compensation method, the type of compensator, the economy, etc. Here are some selection points:
Determine the power factor of the system: By measuring the power factor of the system, it is possible to determine the size of the capacity that needs to be compensated, so as to select the appropriate compensator model.
Determine the compensation method: according to the actual situation of the system, such as the reactive power change range, load nature, etc., select the appropriate compensation method, such as parallel compensation and series-parallel hybrid compensation.
Determine the type of compensator: According to the electrical characteristics of the system, choose a static compensator (such as capacitors, reactors) or a dynamic compensator (such as STATCOM, SVC) for compensation.
Consider the economy: comprehensively consider the compensator's life, efficiency, and other factors, and choose economical and reasonable products.
In addition, there are a few things to keep in mind:
Inductance index: The inductance index refers to the percentage of the transformer's characteristic impedance at the fundamental frequency to the capacitance characteristic impedance, and the size of the index determines the order of inhibition harmonics. It is necessary to select the appropriate inductance index according to the actual needs.
Split-phase compensation and three-phase co-compensation: Split-phase compensation is suitable for systems with three-phase imbalance, while three-phase co-compensation is suitable for general single-phase electrical systems. It is necessary to select the appropriate compensation method according to the actual situation.
Switching power switch: There are two kinds of switching power switches: AC contactor and thyristor, and it is necessary to select the appropriate power switch according to the nature of the load.
Finally, it should be noted that the selection of high-voltage reactive power compensation needs to be comprehensively considered according to the actual situation, and the appropriate compensation method and compensator type should be selected to achieve the best compensation effect and economy. At the same time, it is also necessary to pay attention to the quality and safety of the equipment to ensure the long-term stable operation of the equipment.