With a rapid increase of large wind farms across the globe, a problem associated with the wind turbine is voltage fluctuation of the grid during power generation. Voltage fluctuation could be over voltage or voltage dips and under those conditions the performance of the wind turbines is normally deteriorated. Over voltage withstanding capability of the wind turbine is normally known as High Voltage Ride Through (HVRT) and on the other hand capability of wind turbines during voltage dips is known as Low Voltage Ride Through (LVRT). The problems due to sudden over voltage and voltage dips are normally associated with the power electronic converters fed wind turbines and are being affected by the poor grid conditions. In this paper, an algorithm has been formulated to handle such situations in order to overcome the effects of over voltage and low voltage grid conditions and to save the doubly fed induction generator based wind turbines without affecting the performance. System modeling and simulation results presented in this paper prove the effectiveness of the proposed strategy.
Photovoltaic (PV) systems or solar inverters are now-adays a part of inevitable power generation systems across the globe and they satisfy the energy demand and solve the power crisis in energy market. Many researchers are focusing on the design of power converters used in PV system, control strategies and PV panel designs in order to improve the efficiency of grid connected PV inverters. However, very limited literatures only focused into protection of solar inverters at the grid side. This paper describes the technique to protect the solar inverter during islanding situations or power disconnect of solar inverter from the grid. Power systems shall be applied anti islanding techniques in order to avoid the power delivery from the inverter during utility grid power failures so that unwanted short circuits and fire hazards would be avoided. An anti-islanding algorithm with designed flowchart and simulation results are presented in this paper to validate the proposed methodology.
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