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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)
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)
This paper discusses a power analysis of the two-stage current source converter for single-phase grid-connected photovoltaic system applications. The aim of this research is to analyze the active powers of the converter. The proposed two-stage power conversion topologies are consisting of a dc-dc converter and a single-phase current source inverter. This(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 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 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)
In this paper, a methodology to apply space vector modulation (SVM) to a three-level neutral point clamped (NPC) inverter based on volt-second balancing principle is presented. The proposed scheme, switching-state selection of the three-level NPC inverter by using a nearest three vector scheme, is fully described. A mathematical analysis of the duty cycle(More)
In this paper, a control strategy based on Venturini method is presents in order to solve the impacts of unbalanced input voltage conditions on the matrix converter performances. Conceptually, this strategy is done by modifying the mathematical model for controlling the modulating waves to satisfy the desirable feature, as generated in the event of normal(More)