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In this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity,...
The increasing penetration of distributed and renewable generation presents power systems with a challenge of accommodating multiple inverter-based generators. Distributed generators (DGs), capable of operating in the islanded mode, are often installed in microgrids. However, a control system for operating multiple DGs in the islanded mode using voltage-sourced converter (VSC) is a real challenge...
This paper proposes an optimum resistive type fault current limiter (OR-FCL) as an efficient solution to achieve maximum fault ride-through (FRT) capability of fixed speed wind turbine (FSWT) during various grid faults. A dedicated control circuit is designed for the OR-FCL in a way that enables it to insert an optimum value of resistance in the FSWT's fault current path. Therefore, the OR-FCL significantly...
The penetration levels of wind turbines (WTs) in power grid have significantly increased in the last decade. These renewable energy resources integrated with doubly fed induction generators (DFIGs) are able to provide reactive power to support power grid during steady-state and transient state conditions. However, the DFIGs suffer from high sensitivity to system disturbance and thus, they cannot be...
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