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Direct torque control (DTC) scheme is quite popular in a voltage source inverter fed induction motor (IM) drive. Considering a switching table based algorithm, the flux and torque are directly controlled by applied inverter voltage vectors. There is a direct relation between stator flux and applied inverter voltage vector, which is eventually the stator voltage vector. However, in a current source...
This paper presents an novel approach for stand-by mode sensorless speed estimation scheme for flywheel energy storage system (FESS). The proposed scheme eliminates the sensors required for flywheel speed monitoring, and estimates rotor speed in very short duration without affecting FESS in standby mode. This proposed algorithm only needs minimal change to the existing sensorless-based field orientation...
Coordination of STATCOM and DFIG becomes necessary during steady-state as STATCOM exists in the system to improve the fault-ride through capability of DFIG. This paper aims to perform the coordination by means of minimizing the power loss of the system. As reactive power flow in the system has direct impact on the loss of the system, utilizing reactive power sources effectively can reduce the loss...
Using power electronic converters with reduced capacity in Doubly-Fed Induction Generator (DFIG) based wind turbines makes them vulnerable to over-current during grid disturbances. Crowbar is an effective device to address this issue. This paper aims to analyze the behaviour of a doubly-fed induction generator (DFIG) based wind farm for various timing schemes of crowbar deactivation and resumption...
Among various options available for wind energy conversion systems, this paper focuses on direct driven Synchronous Generator (SG) based variable speed wind turbine (VSWT). Generally SG is connected to the power grid via full-size power converters. But with the growing trend of multi mega watt turbine installation, the idea of modular- converter units is gaining popularity. Multi-module topology has...
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