Abstract
Low-voltage ride-through (LVRT) requirements are defined by grid operators, and they vary based on power system characteristics. Coordinated LVRT control methods have been proposed for wind turbines (WTs) and energy storage systems (ESSs). ESSs can successfully help achieve LVRT by regulating DC-link voltage during a grid fault. During LVRT, WTs cannot transfer power to a grid because of their low voltage and current limit. Moreover, as grid operators typically require reactive power support during a grid fault, active power cannot be properly transferred to the grid. This results in fluctuation in the DC-link voltage in wind power generators and it can induce significant damage in the systems. ESS have been used for achieving better LVRT response to protect WT systems and meet LVRT grid requirements. Previous coordinated control methods have mainly focused on DC-link voltage regulation based on ESS charging and discharging control. As ESSs have high installation cost and limited charging capacity, it is better to coordinate the LVRT response properly considering the state of charge of ESSs and the rotor speed and pitch angle of WTs. In this work, an enhanced coordinated LVRT control method is proposed based on a fuzzy-logic algorithm. Fixed torque of the rotor control and a fixed ramp rate of the pitch control are employed for power analysis which is used in formulating fuzzy-logic controller. The effectiveness of the proposed method is validated by modeling a WT and an ESS topologically and performing simulations using the MATLAB/Simulink SimPowerSystems toolbox.
Highlights
T HE usage of wind power (WP) has increased in recent years
We compared the performance of the proposed method and a conventional method during a grid voltage sag of 80%, which implies that the gridside converters (GSCs) should produce only reactive power and no active power
Conventional method is that both wind turbines (WTs) and energy storage systems (ESSs) are controlled to dc link voltage regulation and does not considered about their operation limit during grid fault
Summary
T HE usage of wind power (WP) has increased in recent years. this has resulted in several issues in the integration of WP in power systems. This can result in the undesirable control response of the WPs. to protect a WT and provide reactive current to the power grid during a grid fault, an LVRT control method is required with or without the use of additional devices. LVRT methods using an ESS in wind power plant were introduced to support voltage restoration at the point of common coupling (PCC) during grid fault [16], [17]. The proposed method can enhance LVRT response by ensuring more stable operation with additional reserve energy through pitch angle control. LVRT response is a combination of pitch angle and rotor speed controls, and it is formulated using fuzzy-based control by analyzing total reserve energy of WPS. The ESS model is described to consider the SoC of the ESS
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