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Widespread utilization of renewable energy sources (RESs) in subtransmissionsystems causes serious problems on power quality, such as voltage violations,leading to significant curtailment of renewables. This is due to the inherentvariability of renewables and the high R/X ratio of the subtransmission system.To achieve full utilization of renewables, battery energy storage systems(BESSs) are commonly used to mitigate the negative effects of massivefluctuations of RESs. Power flow router (PFR), which can be regarded as ageneral type of network-side controller, has also been verified to enhance thegrid flexibility for accommodating renewables. In this paper, we investigatethe value of PFR in helping BESSs for renewable power accommodation. Theperformance of PFR is evaluated with the minimum BESS capacity required forzero renewable power curtailment with and without PFRs. The operationalconstraints of BESSs and the terminal voltage property of PFRs are consideredin a multi-period optimization model. The proposed model is tested throughnumerical simulations on a modified IEEE 30-bus subtransmission system and aremarkable result shows that 15% reduction of BESS capacity can be achieved byinstalling PFRs on a single line.

Reducing BESS Capacity for Accommodating Renewables in Subtransmission Systems with Power Flow Routers