Robust Damping Controller Design in Renewable- integrated Power System Considering Communication Resilience

In recent years, the rapid development of renewable generation like wind power has raised the risk of low-frequency oscillation (LFO). To address this issue, in the study a multi-model, multi-objective robust controller design scheme is proposed to suppress LFO in renewable-integrated power system, in which a wide-area damping controller (WADC) is introduced to mitigate inter-area oscillation (IAO). In this scheme, a bilinear matrix inequality (BMI) optimization model considering H2/H-infinity performance along with pre-defined pole placement is first developed. To consider communication failures, a group of operating conditions corresponding to particular communication channel faults are incorporated into the multi-model system. In addition, an improved two-stage LMI algorithm is proposed to solve the BMI model. The effectiveness of the proposed scheme is validated using a modified four-machine, two-area system with a DFIG wind farm.