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Security Constrained Optimal Power Flow including Post-Contingency Control of VSC-HVDC lines

The paper proposes a security-constrained optimal power flow algorithm (SC-OPF) which allows the post-contingency control of High Voltage Direct Current lines, based on the Voltage Source technology (VSC-HVDC). The presented algorithm integrates corrective actions of HVDC lines in a single optimization problem, without the need to solve a detailed power flow or OPF for each contingency. The approach is based on the current injection method, which is extended to include the HVDC control actions during the post-fault line flow calculation. The algorithm determines the active and reactive power injections (resp. withdrawals) in order to alleviate line overloads and meet postcontingency voltage setpoints. One additional optimization variable is added for each HVDC line and critical contingency considered.