Stability support of autonomous networks with dispersed generation using rotary ride through systems

Dispersed generation (DG) could allow networks to operate autonomously. However, technical challenges need to be addressed to diminish transients in voltage and frequency. In this paper a commercial flywheel ride through system (FRT) is modeled using DigSILENT Power Factory and validated using experimental data. The model is tested with dispersed generation in a test network to simulate transients when disconnection of the grid occurs. The model is also simulated in two study cases: a remote autonomous network supplied by a wind farm and a section of the Dutch electricity grid called “Tiel Zuid” with high penetration of dispersed generation. The results indicate that a FRT can successfully be used to stabilize frequency within regulation limits and maintain stable conditions during disconnections. Additionally, the number of dispersed generation units and the voltage control deeply affect the performance of the RTs and the behavior of the grid.