Kosol Oranpiroj

A power quality monitoring system for real-time fault detection

This paper proposes an embedded system applied for power quality monitoring that captures waveform of fault signal on single phase or 3-phases system in real time and allows users to control and receive data from remote module via Ethernet networks by using TCP/IP protocol. The power quality monitoring system stored fault data in CSV (Comma Separated Value) format into SD-CARD which are easy to analyze later by spread sheet program. The monitoring system uses the energy measurement integrated circuit (IC) ADE7758 with integrated power quality monitoring features, AL440B FIFO (First-In First-Out) memory, LPC2368 microcontroller and ADUC7024 microcontroller. The monitoring system can detect sags, swell and interruptions in power lines and stored fault data when fault signals detected.

The 3-phase 4-wire voltage sag generator based on three dimensions space vector modulation in abc coordinates

Voltage sags from fault or ground fault are the most prevalent disturbances in electrical power system. A recent survey attributes them to 92% of all disturbances. This paper presents the simulation and experimental of 3 phase 4 wire voltage sag generator based on three dimensions space vector modulation in abc algorithm to produce voltage sag for testing electrical equipment. Experimental results have shown that this prototype can be used as voltage sag generator in any conditions.

The 3-phase 4-wire voltage sag generator based on abc algorithm

Voltage sags from fault or ground fault are the most prevalent disturbances in electrical power system. A recent survey attributes them to 92% of all disturbances. This paper presents the simulation and experimental of 3 phase 4 wire voltage sag generator based on three dimensions space vector modulation in abc algorithm to produce voltage sag for testing electrical equipment. The experimental results can be used as an initial phase in process of designing a 3 phase 4 wire voltage sag generator.

SagWave for the 3-phase 4-wire voltage sag generator prototype

This paper proposes SagWave software to generate the waveform for a 3kVA voltage sag generator prototype. The prototype works with 3-phase 4-wire inverter based on abc algorithm. The controller of the prototype was used low-cost dSPic microcontroller. The paper discusses the SagWave software is based on MATLAB graphic user interface (GUI) and the hardware is based on dsPIC microcontroller. The SagWave software allows users to select sag magnitude, sag duration, phase shift and voltage sag type of the each voltage sag. The SagWave sends the detail of voltage sag waveform to the dsPIC to create the voltage sag. The simulation and experimental results have shown that this prototype can be used as voltage sag generator in any conditions.

An implementation algorithm of a carrier-based PWM technique for three-phase four-leg voltage sag generator with microcontroller

This paper presents an implementation of a carrier-based PWM (CBPWM) technique for three-phase four-leg voltage sag source generator with microcontroller. Recently, the implementation of the 3D SVPWM for three-phase four-leg voltage source it seems to be the easiest way to generated voltage sag and it might be a software and hardware burden even for recent digital signal processor (DSP) systems but needs quite a bit of digital logic and computational power. Therefore, this paper presents a simple sag algorithm CBPWM technique for three-phase four-leg voltage sag source generator its very simple design, low-cost and can be easily develop and operate hardware structure. The proposed technique can be implemented with microcontroller and testing algorithm compare with 3D SVPWM technique. The performance of proposed CBPWM strategy has been investigated and verified through simulations and experimental results for three-phase four-leg voltage source generator.

A Direct Torque Control of Induction Motor Using V/f PWM Technique

This paper presents a new DTC for induction motor drive system using V/f PWM technique. This technique is based on the error of torque and magnitude of the stator flux to generate reference stator voltage and frequency fed to motor. The stator flux vector angle is not used to calculate stator voltage. Thus, this is a simple and easy to control by using the carrier-based space vector pulse width modulation instead of hysteresis controllers and does not require a look-up table. The simulation results in Matlab/Simulink is presented prior to hardware implementation the DTC using V/f PWM technique with the new scheme

A 3-Phase 4-Wire Voltage Sag Compensator Based on Three Dimensions Space Vector

Presently available voltage sag compensators are unable to handle neutral current caused by unbalanced and/or nonlinear loads or unbalanced source. In this paper, a 3-phase, 4-wire voltage sag compensator base on 3 dimensional voltage space vector is proposed which can handle the neutral current under voltage sag and nonlinear load conditions. A computer simulation model using PSIM has been developed to analyses the performance of the systems and its effectiveness to mitigate voltage sags

Power Quality Monitoring System Using Real-Time Operating System

This paper represents the methodology for monitoring continuously of power quality (PQ) by using real-time operating system (RTOS). The monitoring system acquired analog signals and send data via Ethernet network based on RTOS programs. After obtained signals, the monitoring system then send PQ information to the personal computer. The applied protocol is the user datagram protocol (UDP) to send PQ information via Ethernet. The architecture and software implementation are mentioned in the paper. An application test was created to test the throughput of the communication between the measurement point and the target computer.