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High wind power penetration levels result in additional requirements from wind power in order to improve frequency stability. Replacement of conventional power plants with wind power plants reduces the power system inertia due to the wind turbine technology. Consequently, the rate of change of frequency and the maximum frequency deviation increase after a disturbance such as generation loss, load increase, etc. Having no inherent inertial response, wind power plants need additional control concepts in order to provide an additional active power following a disturbance. Several control concepts have been implemented in the literature, but the assessment of these control concepts with respect to power system requirements has not been specified. In this paper, a methodology to assess the inertial response from wind power plants is proposed. Accordingly, the proposed methodology is applied to one of the inertial response control concepts from the literature. [ABSTRACT FROM PUBLISHER]

This paper demonstrates that wind farms connected to a grid through a series compensated transmission line may exhibit sub-synchronous oscillations. It is shown that the flux in the stator winding and the currents in the transmission line are the major participants of this mode. Dynamic Phasors are used to model the small signal model of the transmission network so that the network is accurately represented at sub-synchronous frequencies. An SVC is used to introduce damping to this oscillation mode, with line current as the feedback signal. The application is demonstrated for a large practical power system. [ABSTRACT FROM PUBLISHER]