Reactive power management through inductive compensation

The inductive compensation systems of the INКA series are the extension of the spectrum of classical compensation systems into the inductive range in order to compensate equipment with capacitive characteristics. Particularly in no-load operation, input filters of converters or cable networks exhibit a clearly capacitive behavior. In total, therefore, a capacitive reactive power of several 100 kvar can result for a photovoltaic park, for example. However, this capacitive reactive power is generally not desired by the grid operators and may entail high costs for reactive power. As a result, grid operators are asking their customers to comply with contract limits for reactive power. The exchange of reactive power is increasingly regulated, so if the contract limits for reactive power exchange are exceeded, the issue of reactive power management becomes more important.

Capacitive reactive power is mostly constant, so in the vast majority of cases it is not necessary to install a regulated inductive compensation system. An inexpensive, switchable fixed compensation system is quite sufficient. However, it is easily possible to equip several fixed stages with an additional controller module that switches the stages on or off depending on the compensation requirement.

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INKA – Inductive compensation

INKA compensations are available for nominal voltages from 400 to 480 V with power stages of 50, 100 and 200 kVar per cabinet.

Inductive compensations (shunt reactors) have a slightly higher power dissipation compared to capacitor stages of the same power. The power dissipation, the higher space requirement and the higher weight of the chokes determine the possible design variants.

The basic version is designed in IP20 for indoor installation with natural convection. Alternatively, there is the indoor version in IP42 with thermostat-switched fans. For outdoor installation, there is the cost-effective version in IP32 with natural convection cooling, which requires an installation protected from weather and direct sunlight. In addition, there is the version in the double-walled IP54 housing for outdoor installation with air conditioning unit.

Induktive Kompensation