scholarly journals Multi-Mode Voltage Sag/Swell Generator Based on Three-Phase Inverter Circuit

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6520
Author(s):  
Qiguo Han ◽  
Xing Wang ◽  
Pengfei Hu ◽  
Maolin Wang ◽  
Xu Luo ◽  
...  
Keyword(s):  
Low Voltage ◽  
Power Grid ◽  
Thermal Power ◽  
Voltage Sag ◽  
Phase Inverter ◽  
Grid Voltage ◽  
Three Phase ◽  
Inverter Circuit ◽  
Three Phase Inverter ◽  
Multi Mode

The voltage ride through capability of the major auxiliary variable-frequency drive (VFD) in large thermal power plants is the key technical issue of power grid and source coordination. In order to test the high voltage ride through (HVRT) and low voltage ride through (LVRT) capability of the auxiliary VFD, it is necessary to develop a power supply to simulate different grid voltage sag and swell accurately. In this paper, a generator (VSSG) based on the common three-phase inverter circuit that can simulate multi-mode voltage sag/swell is proposed. The designed main circuit consisting of transformer, rectifier, DC split capacitors, three-phase inverter, and LC-filter can generate single-phase and three-phase voltage sag, swell, and phase angle jumping flexibly. The developed control strategies composed of the double closed-loop control and the neutral voltage balance control achieve accurate output, fast dynamic response, and step-less adjustment. Simulation and experiment results verify the multi-mode voltage simulation performances of the proposed VSSG, which can be effectively used to emulate power grid voltage sag and swell phenomena under the IEEE 1159 and IEC standards.

Simulation of SPWM in Three-Phase Inverter Based on LabVIEW and Multisim

2013 ◽  
Vol 694-697 ◽  
pp. 1435-1438
Author(s):  
Shi Su ◽  
Wen Bin Zhang
Keyword(s):  
State Space ◽  
Power Grid ◽  
State Space Model ◽  
Real Power ◽  
Phase Inverter ◽  
The Real ◽  
Space Model ◽  
Single Level ◽  
Three Phase ◽  
Three Phase Inverter

This paper presents simulation of a three-phase single-level inverter. The inverter is designed to be fed into the power grid. State-space model and sinusoidal PWM technique are described in this paper. The simulation is based on Multisim and LabVIEW co-simulation. This method of SPWM simulation has some software and harmonic which must be taken into account while using it in the real power grid. Efforts are underway to improve the three-phase single-level inverter.

scholarly journals Low voltage grid connected three-phase inverter control with hybrid neuro-fuzzy 

2021 ◽  
Vol 2 (1b) ◽  
pp. C20A07-1-C20A07-6
Author(s):  
Ndiaye El hadji Mbaye ◽  
◽  
Ndiaye Alphousseyni ◽  
Faye Mactar ◽  
Keyword(s):  
Fuzzy Inference ◽  
Low Voltage ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Inference System ◽  
Phase Inverter ◽  
Proportional Integral ◽  
Neuro Fuzzy ◽  
Three Phase ◽  
Three Phase Inverter

In this paper, an Adaptive Neuro Fuzzy Inference System (ANFIS) and Modified Proportional Integral Derivate (MPID) are used for respectively DC-link voltage regulation and grid currents regulation for grid connected three-phase inverter. The main purpose of this work is to reduce the fluctuation on DC-link voltage and the Total Harmonic Distortion (THD) on the injected currents. Indeed, the use of Proportional-Integral (PI) controller cannot achieve these objectives due to their disturbances sensitivity problem and limited regulation bandwidth. To avoid these problems, an ANFIS regulator has been designed. Results show that ANFIS has a very short response time (Rt) 0.097 s with no overshoot (D).

scholarly journals A Precise Current Detection Method Using a Single Shunt and FET Rds(on) of a Low-Voltage Three-Phase Inverter

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 9
Author(s):  
Jae-Yeob Hwang ◽  
Ji-Hwan Park ◽  
Ji-Ho Choi ◽  
Jun-Ik Uhm ◽  
Geun-Ho Lee ◽  
...  
Keyword(s):  
Kalman Filter ◽  
Detection Method ◽  
Low Voltage ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Current Sensor ◽  
Phase Inverter ◽  
Three Phase ◽  
Current Detection ◽  
Three Phase Inverter

In this study, a low-voltage three-phase inverter was used alongside a shunt resistor to measure the current. However, it is known that this type of inverter and shunt resistor system has a region where the measurement of current is impossible due to structural limitations. As a result, many studies have focused on this region through the use of additional algorithms. Most studies measured current by forcibly adjusting the PWM duty in order to measure the current at the region where it could not be sensed. However, unfortunately, the total harmonic distortion (THD) increases in the current due to PWM adjustment. This causes an increase in torque ripple and inverter control instability. Therefore, in this paper, current was measured using the Rds(on) value between the drain source resistor when MOSFET was turned on and the Kalman filter in a low-voltage three-phase inverter with a single shunt. Additionally, the value was verified via comparison with the values achieved when a Hall-type current sensor and single shunt were used. As a result, this study confirmed that the inverter with a single shunt performs the same as a Hall-type sensor at the region where current cannot be detected.

scholarly journals Improved Active and Reactive Control of a Small Wind Turbine System Connected to the Grid

Resources ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 54 ◽  
Author(s):  
Theofilos Papadopoulos ◽  
Emmanuel Tatakis ◽  
Efthymios Koukoulis
Keyword(s):  
Wind Turbine ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Phase Inverter ◽  
Small Wind Turbine ◽  
Three Phase ◽  
Control Scheme ◽  
Dc Bus ◽  
Three Phase Inverter

This paper deals with the interconnection of a small wind turbine with the low voltage distribution grid and the implementation of an improved control scheme, which also serves educational purposes. Initially the subsystems—wind turbine, rectifying bridge, interleaved boost converter, three-phase inverter, interconnection inductors, lifting transformer, filtering capacitors—are investigated, in order to explain their selection, based on the LEMEC (Laboratory of Electromechanical Energy Conversion, Department of Electrical Engineering, UoP) educational policy. Afterwards, the three-phase inverter control scheme, which is responsible for controlling its input voltage (voltage of the DC Bus) and consequently the active power, as well as the reactive power injected into the grid (VQ control) is analyzed. This is accomplished through DQ transformation and PI controllers which are responsible for generating the appropriate reference signals, to generate the required Space Vector Pulse Width Modulation (SVPWM) pulses to drive the semiconductor switches of the inverter. In addition, it is explained how this particular control method can compensate reactive power in the grid, even in apnea, by automatically charging the DC Bus. Finally, simulation and experimental results are given to prove the proposed control method effectiveness.

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