Fault-tolerant Control Of Power Converter For Wind Energy Conversion System Using Pmsg

The most popular renewable energy resources are wind energy and solar energy resources.Both kind of energy sources are offering many advantages,like as they are free and clean.Such advantages increase the demand for the renewable energy resources in the global market.As far as the installation costs of wind energy systems are considered,their costs are lower as compared to the solar energy.The major problem with the wind energy system is that its availability is sporadic.Due to which it needs to be backed by some other power resources.As the market of wind energy is increasing so the cost and reliability issues of wind energy conversion systems(WECSs)have become more important.The problem of unexpected shutdown of WECS may cause a significant financial loss,as it costs a lot for its inspection and maintenance.Mostly the WECSs are installed in remote locations and based on high towers.It holds a big place in the market based on the PMSG.Such systems have the capabilities and advantages such as high power density and efficiency.Any fault has the ability to lead the system towards a significant loss of energy production.WECSs are prone to various faults.In case,if the fault occurs in a converter legs,the system will shut down.In that situation,the faulty back-to-back converter switches into fault-tolerant control mode which avoids the sudden stop of the system and it continues its energy production under the five leg converter topology.The work presents the modeling,control and simulation of direct drive PMSG based WECS.This system captures optimal power from the wind source.Two modes are compared and explained with results.In order to track maximum powers from a wind energy system and due to non-linear behavior of wind turbine,the optimal tip speed ratio based maximum power point tracking technique including battery and pitch angle control for maximum output is used in a modeling.The classical,conventional six leg converter with a five leg converter is compared and simulated in a Matlab/Simulink.In case of fault,to improve the system reliability,affordability,efficiency,continuity and availability,the five leg converter topology under fault-tolerant mode is implemented in a WECS.The five leg converter topology is proposed to replace the classical and conventional six leg converter having the same with efficient ability.