Stabilization of Power System including Wind Farm by Two-Step P and Q control of HVDC Interconnection Line

Abstract

Penetration of renewable energy sources, such as wind power generation and PV power generation, into the power systems has been increasing significantly. Especially, wind power generation has attracted attention due to their superior characteristics such as low cost and high energy conversion efficiency. However, the power system including large-scale wind farm (WF) can become unstable during a fault condition because WF can be decoupled due to the instantaneous voltage drop in accordance with the grid code of Fault Ride Through (FRT) requirement. This paper proposes a new two-step control strategy using High Voltage Direct Current (HVDC) interconnection line. The proposed system controls the active power and the reactive power delivered to the grid from the HVDC interconnection line during a fault condition. The effectiveness of the proposed method is confirmed by simulation analyses on PSCAD/EMTDC software.