A collaborative planning of PCCs siting and transmission network expansion for super large-scale offshore wind clusters

The integration of super large-scale offshore wind clusters into the onshore power grid brings challenges for the flexibility of the transmission network. Therefore, this paper proposes a two-stage collaborative planning of points of common coupling siting and transmission network expansion for super large-scale offshore wind clusters, based on a multi-voltage-level stratified integration mode which enables offshore wind power to transmit to larger regions for accommodation. At first, the transmission network flexibility indexes are established. Then, a two-stage collaborative planning model for points of common couplings siting and transmission network expansion is proposed, which comprises a collaborative planning model and an optimal power flow operation model. The proposed model reduces wind curtailment and load shedding by optimizing the annual total cost and flexibility transmission capability of the network. Finally, the effectiveness of the proposed method is verified using a modified IEEE 30-bus system and a 65-bus system.