Abstract
In this paper, a coordinated control scheme for wind turbine generator (WTG) and supercapacitor energy storage system (ESS) is proposed for temporary frequency supports. Inertial control is designed by using generator torque limit considering the security of WTG system, while ESS releases its energy to compensate the sudden active power deficit during the recovery process of turbine rotor. WTG is modeled using the fatigue, aerodynamic, structure, turbulence (FAST) code, which identifies the mechanical loadings of the turbine and addresses electro-mechanical interactions in the wind energy system. A damping controller is augmented to the inertial control to suppress severe mechanical oscillations in the shaft and tower of the turbine during frequency supports. Furthermore, the result of small-signal stability analysis shows that the WTG-ESS tends to improve the stability of the whole multi-energy power grid. The major contributions of this paper will be validated by utilizing the proposed control method that combines the grid support capability and maintaining the integrity of structural design of the turbine for normal operations.
Highlights
MOTIVATED by aggressive sustainable energy policies, renewable energy is supplying a large amount of elec‐ tricity demands in modern power systems
It has been proven that the proposed inertial control is able to provide effective power system frequency regulation without affecting the structural integrity of the wind turbine generator (WTG) me‐ chanical parts
The security of WTG system is considered and a feedback controller to damp structural modes in tur‐ bine shaft and tower is augmented by the modified torque-limit-based inertial control (TLIC) method
Summary
MOTIVATED by aggressive sustainable energy policies, renewable energy is supplying a large amount of elec‐ tricity demands in modern power systems. Taking ad‐ vantage of flexible controls of converters, it is possible for WTGs to provide effective frequency regulation to enhance power system stability Based on these characteristics, some inertial control methods [2], [3] can be added to the power reference of WTG in the power/speed plane by understand‐ ing its overloading capability. YAN et al.: ELECTRO-MECHANICAL MODELING OF WIND TURBINE AND ENERGY STORAGE SYSTEMS WITH ENHANCED INERTIAL RESPONSE works. We propose a damping method to mitigate the mechanical loading escalation at the turbine shaft and tower when the inertial control is activated To perform these tasks, we first introduce the modeling of wind power system with the FAST program.
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