Design Research of Unit Power Factor Power Converter

2014 ◽  
Vol 986-987 ◽  
pp. 1809-1812
Author(s):  
Wei Sun ◽  
Kui Hua Wu ◽  
Bo Yang ◽  
Rong Liang ◽  
Jian Wang ◽  
...  
Keyword(s):  
Power Factor ◽  
Design Research ◽  
Control Method ◽  
Power Converter ◽  
Current Control ◽  
Unity Power Factor ◽  
Unit Power ◽  
Harmonic Content ◽  
Direct Current Control ◽  
Power Factor Control

In view of the problems that traditional direct current control calculation is complex, that sensor precision requirements are high. This paper proposes a new control method of unit power factor power converter, which is easy to realize with simple control structure dispense with current sensor. Through the simulation and experimental verification, the control strategy can achieve unity power factor control, and the harmonic content is small and the operation is stable.

Design and Implementation of 30kW Three-Phase PV Grid-Connected Inverter

2012 ◽  
Vol 241-244 ◽  
pp. 636-640
Author(s):  
Wu Wu Tang ◽  
Liang Liang Chen ◽  
Hong Xu Yin ◽  
Hao Dong
Keyword(s):  
Control Method ◽  
Dynamic Performance ◽  
Current Control ◽  
Unity Power Factor ◽  
Harmonic Content ◽  
Three Phase ◽  
Rotating Reference Frame ◽  
Grid Connected Inverter ◽  
Pv Grid ◽  
Factor State

This paper developed a mathematical model of three-phase PV grid-connected inverter, and studied the grid-connected current control method based on PI control in synchronous rotating reference frame. Simulation and experimental results from the prototype of 30kW three-phase PV grid-connected inverter proved the correctness and the feasibility of the control strategy, and this grid-connected inverter can operate at the unity power factor state with a nice dynamic performance, and the output current has high sinusoidal and low harmonic content as well as good symmetry.

scholarly journals Reduced Switch Multilevel Inverter based STATCOM

2020 ◽  
Vol 6 (5) ◽  
pp. 117-121
Author(s):  
Akshay Kadu
Keyword(s):  
Direct Current ◽  
Power Factor ◽  
Control Method ◽  
Digital Simulation ◽  
Fast Response ◽  
Current Control ◽  
Multilevel Inverter ◽  
Control Technique ◽  
Basic Unit ◽  
Direct Current Control

This paper presents an application of reduced switch multilevel inverter topology to STACOM. This topology consists of basic unit in which two switches are connected in series and one H-bridge unit. Multilevel inverter is beneficial in terms of reliability and improved output quality. Multilevel inverter have only drawback of higher number of switches. This reduced switch topology has less number of switches as compared to conventional Cascaded H Bridge Inverter. Compared to direct control method, indirect control method is simple but due to fast response and precise control, direct current control method is quite effective. In this work STACOM is implemented to improve the Power factor of the power system. An extensive digital simulation of the recommended STATCOM and its controller is carried out using MATLAB/SIMULINK software to study system performance. Simulation results prove that using Direct current control technique overall power factor is improved.

scholarly journals Comparison between PI and PR Current Controllers of a Grid- Connected Photovoltaic System Under Load Variation

2018 ◽  
Vol 9 (3) ◽  
pp. 1311 ◽  
Author(s):  
Soukaina Essaghir ◽  
Mohamed Benchagra ◽  
Noureddine El barbri
Keyword(s):  
Power Factor ◽  
Control Method ◽  
Current Control ◽  
Photovoltaic System ◽  
Control Technique ◽  
Unity Power Factor ◽  
Control Loops ◽  
Proposed Model ◽  
Three Phase ◽  
Pr Controller

This paper presents a current control technique for a three-phase grid-connected DC /AC inverter which is used in photovoltaic systems. A Proportional-Resonant (PR) controller is used for replacing the conventional Proportional-Integral (PI) controller in this system. By comparison with the conventional PI control method, the PR control can introduce an infinite gain at the fundamental frequency and hence can achieve zero steady-state error. The proposed model is based on two control loops: the first control loop regulates DC link voltage and the second one is used to keep the injected current to the grid in phase with the voltage by means of a Phase Locked Loop (PLL) in order to achieve a unit power factor and to adjust the output power as required. In order to examine the effectiveness of the suggested control, a simulation using the Matlab/Simulink software has been done and it’s concluded from the simulation results that the presented control by using the PR controller can be able to maintain maximum active power and to keep always a unity power factor despite variation load.

scholarly journals Research on Three-phase Voltage Source PWM Rectifier Based on Direct Current Control

2019 ◽  
Vol 9 (1) ◽  
pp. 6864-6867
Keyword(s):  
Direct Current ◽  
Control Method ◽  
Current Control ◽  
Voltage Source ◽  
Pwm Rectifier ◽  
Phase Voltage ◽  
Unity Power Factor ◽  
Feed Forward Control ◽  
Three Phase ◽  
Direct Current Control

This paper is focused on the development of the rectifier for three phase voltage source to achieve unity power factor at input supply mains. The mathematical model is developed for PWM using direct current control and to apply 3- phase voltage source rectifier decoupled with feed-forward control. This method regulates the output voltage with reduced harmonics. Different PWM techniques such as Hysteresis band and Carrier based sinusoidal is applied and their performance is analysed. This work is implemented in MATLAB/SIMULINK environment. The results confirm the validity of the model and its control method.

Study of Hoist Control System Based on Dual Three-Level Inverter

2014 ◽  
Vol 577 ◽  
pp. 368-371
Author(s):  
Feng Wang ◽  
Shu Yun Qiao ◽  
Xu Long Zhang
Keyword(s):  
Control System ◽  
Power Factor ◽  
Control Method ◽  
Dynamic Performance ◽  
Power Saving ◽  
Power Converter ◽  
Unity Power Factor ◽  
Energy Flows ◽  
Stator Flux ◽  
Grid Side

The double-fed control strategy for AC hoist motor is discussed in this paper. The AC/DC/AC power converter is adopted as main circuit. Three-phase neutral-point-clamped three-level rectifier is used as AC/DC link to realize unity power factor at grid-side, which reduces harmonic distortions. For the DC/AC inverter, three-level topology is used, which is controlled by stator-flux oriented vector control method. Meanwhile, energy flows in bidirectional way by back to back three-level power converter. The hoist motor control system obtains a high dynamic performance when stator side operating in unity power factor condition. The reliability and safety of hoist system is improved based on double PLC. The control system mentioned in this paper is being used to control a shaft hoist with a capacity of 260kW, and the power saving is remarkable.

Cooperative Voltage Control Method by Power Factor Control of PV Systems and LRT

2012 ◽  
Vol 132 (4) ◽  
pp. 309-316 ◽  
Author(s):  
Shoji Kawasaki ◽  
Noriaki Kanemoto ◽  
Hisao Taoka ◽  
Junya Matsuki ◽  
Yasuhiro Hayashi
Keyword(s):  
Power Factor ◽  
Control Method ◽  
Voltage Control ◽  
Pv Systems ◽  
Power Factor Control
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