Yuttana Kumsuwan

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This paper presents a carrier-based unbalanced pulsewidth-modulated method for a two-phase four-leg voltage source inverter (VSI) and its realization for an unsymmetrical two-phase induction motor. A modulation strategy is developed to synthesize unbalanced two-phase output voltage waveforms based on the unipolar modulation technique with open-loop V/f(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)
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)
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)
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)
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)
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)
This paper presents the implementation of shunt active power filter using source voltage and source current detection. The harmonic current and reactive power compensation of shunt active power filter controller is based on the digital signal processing (DSP) to control its operation. First, the signal quality of the designed prototype was tested with the(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 control algorithm of a three-phase three-level power factor correction (PFC) rectifier, using a mathematical analysis of continuous space vector modulation (CSVM) is presented. The proposed control scheme, in order to generate the duty cycle signals for each switching device with no need of to determine the direction of line currents and(More)