Abstract:
Wind turbine (WT) and energy storage system (ESS) coordinated control approaches have been proposed to smooth wind power (WP) variations, shave peaks, enable power scheduling, and allow low-voltage ride-through.
Grid operators set LVRT, which must be met during grid faults. Many LVRT methods have been proposed with or without an ESS. ESSs are also better for some WP apps. WTs can operate more economically and reliably with an ESS. However, ESS installation is expensive and charging and discharging range is limited.
When a grid fault occurs, WT operation and ESS SoC may diverge. To operate reliably and economically during a grid fault, WT and ESS must be coordinated. Thus, we present a coordinated fuzzy-based LVRT technique that accounts for WT and ESS operation conditions.
By using rotor speed and SoC in the fuzzy control algorithm, the suggested technique evaluates WT and ESS effective reference powers. The strategy is validated by two case studies on ESS SoC and WT rotor speed violations.
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