Inductive decoupling of low-voltage sub-networks

Voltage control in networks with predominantly resistive coupling is most efficient when controlling the active power flow. By introducing a series connected inductor for a dedicated part of the network the coupling can be shifted to the inductive type. Hence the voltage in such sub-networks can be influenced by injection of reactive power. Furthermore harmonic distortions present in the main grid are reduced. This paper presents the functional principle of such inductively decoupled sub-networks including both simulation and measurement results. The measurement were performed on a prototype in the power range of 3.3 kVA. The implementation into a 100 kVA prototype is progressing.