Reduction of Wind Power Curtailment by VSC-HVDC System Considering LVRT Operation

Abstract

A methodology to reduce wind power output curtailment using voltage-source converter-based high voltage direct current (VSC-HVDC) systems is proposed. Wind generation sources should have a reserve capacity for reactive power output to cope with voltage drop events. The active power output of the wind model should be curtailed to ensure reactive power output. This curtailment increases the fuel cost of the power system, which is undesirable from an economic perspective. However, the reactive power output from wind generation can be reduced if the VSC-HVDC system provides sufficient reactive power. The proposed method determines the optimal wind curtailment level based on an optimal power flow (OPF) formulation. The outputs of the synchronous generators, VSC-HVDC systems, and wind generation sources are treated as controllable variables in the OPF analysis. Feasible voltage operation near a wind generation source after a voltage drop is included as an additional constraint. The optimal values of the wind power curtailment levels and generator dispatch are examined using the IEEE 39-bus system model. Sensitivity analysis is conducted on the wind-side voltage constraints, installation capacities of the VSC-HVDC systems and wind sources.