“…Its various capabilities have been discussed in many papers in areas of power flow control [6][7][8], transient stability improvement, and oscillation damping control [9,10]. Furthermore, in the literature, the HVDC transmission system has been applied in a vast variety of control system investigations, including PI control [11][12][13][14], H ∞ approach method [15], linearization control [11], sliding mode control [16,17], backstepping design [18,19], flatness theory-based control [20], and passivity theory-based control [21,22]. All the aforementioned methods, including linear and nonlinear controllers, guarantee asymptotic stability of the closedloop system.…”