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This paper presents a vector control of grid-connected three-level neutral point clamped voltage source converter (3L-NPC-VSC) connecting doubly-fed induction generator (DFIG) drives for variable-speed wind power generation. The control algorithm of the grid-connected 3L-NPC-VSC applies the concepts of the decoupled vector control method, which provides(More)
This paper proposes a balanced and unbalanced three-phase voltage sag generator and voltage sag control strategy for testing electrical equipment. The proposed system has a simple structure, by using three single-phase H-bridge inverters with the unipolar pulsewidth modulation technique. The control strategy is developed for generating sag voltage(More)
This paper present a modified modulation strategy based on a triangular carrier wave for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). The switch states of each leg are determined by comparison between the modulation signals and a triangular carrier wave, which is used only of one triangular carrier wave for generate the gating(More)
This paper presents a performance enhancement of a permanent magnet synchronous generator (PMSG) system with control of generator-side converter for a wind turbine application. This method uses zero d-axis stator current control to minimize winding losses of the generator. The electromagnetic torque of the generator is correlated with the magnitude of the(More)
In this paper, a static series-connected compensator with load-side connected shunt converter and a voltage sag detection control strategy are proposed. The proposed system uses three single-phase H-bridge inverters with the unipolar pulsewidth modulation technique. The control strategy for the series converter is based on the transport delay phase-locked(More)
In this paper, the modified maximum power point tracking (MPPT) based-on the ripple correlation control technique application for single-phase voltage source inverter (VSI) grid-connected photovoltaic (PV) system is proposed. The algorithm has been developed by using the mean function instead of the 1st order highpass filters (HPFs) and lowpass filters(More)
This paper proposes an application of improved synchronous reference frame (ISRF)-based voltage sag detection in voltage sag compensation system. The ISRF-based voltage sag detection presents the fast detection time that is suitable to use in voltage sag compensation system. The proposed voltage sag compensation system consists of ISRF-based voltage sag(More)
Voltage sag compensation using two three-phase voltage-fed PWM converters is presented. This is new approach to mitigate the voltage sags without using special energy storage devices or power transformers. In the normal incident, the load is fed the power from utility supply via main static transfer switch. When voltage sag is occurred, the main static(More)
A simple type-A three-phase voltage sag generator with programmable is proposed for testing equipment, small or medium-power application, such as adjustable-speed drives (ASDs), contactors, relays, programmable logic-controller (PLC), and personal computers (PCs), etc. The generating system consists of a 1-kVA synchronous generator, a phase-control ac-dc(More)