Studies On Sub-synchronous Resonance Based On Blocking Filter

The phenomenon of SSR (sub-synchronous resonance) threatens the stability of power system and limits its development. Tuoketuo Power Plant is based on the blocking filters to mitigate sub-synchronous resonance, but the generator of Tuoketuo Power Plant parallel operation induce self excitation when three-phase blocking filter is running. Firstly, the simulation model of mitigating SSR using blocking filter for Tuoketuo Power Plant is established in PSCAD/EMTDC software and center frequency offset of blocking filter is analyzed. Secondly, analyze the phenomenon of self excitation from the parameter of the generator in depth. Thirdly, analyze the test data of 8# generator. At last, basing on the 2# generator results of simulation and experimental and put forward the corresponding solution for self-excitation.