Contribution of DFIG-based wind farms to power system short-term frequency regulation

Abstract

A control strategy that provides a doubly-fed induction generator (DFIG)-based wind farm with the capability to provide short-term frequency regulation is investigated. The controller manipulates dynamically the position of the DFIG rotor flux vector to slow down the generator allowing for a temporary surge in the power output, which helps to reduce the frequency drop following the transient period after the loss of network generation. A generic network that combines synchronous and wind-farm generation has been modelled and used for control system design and dynamic assessment. Studies are conducted for the DFIG operating at different speed and power output conditions. Simulation results are described which illustrate the contributions to frequency support of DFIG-based wind farms controlled with the proposed strategy. Machine data and control parameters are provided

Distributed vs. concentrated rapid frequency response provision in future great britain system

“…With the prospect of having more NSGs displacing conventional generation, concerns about frequency transients becoming worse, arise. This issue is especially In the mid 2000's, following the rapid growth of wind generation in Europe, the inertial response from wind power became an active topic of research [3], [4], [5] that eventually led to some of the biggest wind turbine manufacturers implementing their own strategies to supply so-called "synthetic inertia" [6]. That is, a fully-controlled artificial mechanism to enable wind turbines to deliver rapid frequency response (RFR) in a similar way as synchronous generators do.…”

Control and Performance Assessment of Variable Rotor Resistance Based Wind Turbines Regarding the Aerodynamic Power Fluctuations

“…The dynamic performance studies of the wind turbines are mainly dedicated to DFIG-based WTs and can be divided into several categories, such as: impact of WT on power system dynamics [5][6], grid fault response of WT [7][8], fault ride-through capability of WT [9][10], participation of WT in grid frequency stability [11][12], investigation the WT drive train dynamics [13][14], and WT dynamic response under wind speed and aerodynamic power fluctuation [15][16].…”

Enabling Inertial Response of Variable-Speed Wind Turbines: A Survey and New Perspectives

“…Besides, there are also some other methods to improve WTs' inertial response capability. An approach which utilises slip to supply the short-term frequency support is discussed in [24]. [25] proposes a method to provide the dynamic frequency support through properly altering the maximum power point tracking (MPPT) curve coefficient, which is a function of grid frequency deviation.…”