This paper investigates an improved active power control method for variable speed wind turbines to enhance the inertial response and damping capability during transient events. The optimized power point tracking controller which shifts the turbine operating point from the maximum power point tracking curve to the virtual inertia control curves according to the frequency deviation is proposed to release the "hidden" kinetic energy and provide dynamic frequency support to the grid. The effects of the virtual inertia control on power oscillation damping capability are theoretically evaluated. Compared to the conventional derivative regulator based inertia control, the proposed control scheme can not only provide fast inertial response, but also increase the system damping capability during transient events. Thus, inertial response and power oscillation damping function can be obtained in a single controller by the proposed optimized power point tracking control. A prototype three-machine system containing two synchronous generators and a PMSG based wind turbine with 31 percent of wind penetration is tested to validate the proposed control strategy on providing rapid inertial response and enhanced system damping.
Abstract-In a DC grid, the inherent inertial support from the DC capacitors is too small to resist step changes or random fluctuations from the intermittent power resources, which results in lower DC voltage quality. In this paper, an adaptive droop control (ADC) strategy is proposed to achieve an increased inertia from the droop controlled converter.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.