A hybrid compensation system for provision of ancillary services in medium voltage grids

Medium voltage grids are subject to a change in load situation due to the installation of decentralized generation plants. Predominantly load symmetry, active and reactive power flows as well as requirements for the necessary capacity of earth fault compensation are affected. Decentralized generation connected through power electronics as well as consumers using switching power supplies cause distortions. Furthermore, electrical energy storage is gaining importance within rural distribution networks to compensate fluctuating generation plants. A hybrid compensation system can contribute to provision of adequate power quality by integrating several ancillary services into a single device. In this article the design of the hybrid compensation system is introduced and it is evaluated, which ancillary services in medium voltage distribution grids are likely to be provided using an inverter-based hybrid compensation system and a hybrid storage system.