scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

scholarly journals Voltage Oriented Control(VOC) Of The PWM Rectifier Using Active Filtering Function

2018 ◽  
Vol 7 (2.19) ◽  
pp. 90
Author(s):  
S Md.Mazhar-Ul-Haq ◽  
Dr S.S.Tulasi Ram ◽  
Dr JBV.Subramanyam
Keyword(s):  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Theoretical Concept ◽  
Unity Power Factor ◽  
Bidirectional Converter ◽  
Boost Rectifier ◽  
Active Filtering ◽  
Filtering Function ◽  
Grid Side

Pulse width modulation rectifier has gathered its demand during the recent years for modification needs of the ac-dc conversion systems need for industries, customer and power grid sectors. This bidirectional converter can act as ac to dc boost rectifier with near unity power factor at the grid side along with the regulated and ripple free output voltage at the dc side. This paper deals with the evaluation of control strategy called voltage oriented control with active filtering function, Total harmonic distortion (THD),dynamic performance and parameter sensitivity is studied theoretical concept is provided and results of computer simulations are given by using mat lab. 

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.

SINGLE-STAGE SINGLE-SWITCHED RECTIFIER/REGULATOR WITH MAGNETIC COUPLED NONDISSIPATIVE SNUBBER

2004 ◽  
Vol 13 (03) ◽  
pp. 557-576
Author(s):  
CHUNG-WOOK ROH ◽  
GUN-WOO MOON ◽  
MYUNG-JOONG YOUN
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Power Factor Correction ◽  
Power Level ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Single Stage ◽  
Unity Power Factor ◽  
Forward Converter ◽  
Current Harmonic

This paper presents a new single-stage single-switched forward converter with magnetic coupled nondissipative snubber, which gives good power factor correction (PFC), low current harmonic distortion, and tight output voltage regulation. The proposed converter features low switch current and voltage stresses, essential for the design of a single-stage power factor correction converter. The prototype shows that the IEC1000-3-2 requirements are met satisfactorily with nearly unity power factor. This proposed converter with magnetic coupled nondissipative snubber is particularly suited for power supply applications with low power level.

scholarly journals Performance Between PFC Cuk and Bridgeless PFC Cuk Converter with Various Output Voltages

2019 ◽  
Vol 8 (2S2) ◽  
pp. 41-46
Keyword(s):  
Low Power ◽  
Power Factor ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Input Current ◽  
Unity Power Factor ◽  
Cuk Converter ◽  
Maximum Current ◽  
Simulation Results ◽  
Power Application

This paper presents about the comparison between single-phase PFC Cuk converter and bridgeless PFC (BPFC) Cuk converter for low power application. This study attempts to investigate the characteristics of conventional and bridgeless PFC Cuk converter structures with three different output voltages and verified by the simulation results. The BPFC Cuk converter provides a lower Total Harmonic Distortion (THD) of input current than the conventional PFC Cuk converter. However, the conventional PFC Cuk converter has advantage of less maximum current stress at components compared to the BPFC Cuk converter. Conventional and BPFC Cuk converter can achieve an approximately unity power factor (PF).

Comparison of Control Strategies for DSTATCOM in Power Distribution System

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Koteswara Rao Uyyuru ◽  
Mahesh Kumar Mishra
Keyword(s):  
Power Factor ◽  
Control Strategy ◽  
Power Distribution ◽  
Distribution System ◽  
Control Strategies ◽  
Harmonic Distortion ◽  
Unity Power Factor ◽  
Power Distribution System ◽  
Harmonic Cancellation ◽  
Harmonic Resonance

In this paper, the perfect harmonic cancellation (PHC), unity power factor (UPF) control strategies of distribution static compensator (DSTATCOM) are compared along with a newly proposed control strategy. In the proposed strategy, to get the best power factor, the conductance factors for the compensated load are evaluated for a specified source current total harmonic distortion (THD) limit. The performance of this method along with perfect harmonic cancellation (PHC) and unity power factor (UPF) strategies is evaluated on a distribution system model developed using PSCAD 4.2.1. In the distribution system, harmonic resonance is one of the prime factors for the harmonic propagation. Hence, in damping the harmonic resonance, selection of an appropriate control strategy for the DSTATCOM is crucial and this is verified with a detailed study. The simulation results are presented to show the performance of these strategies in load compensation and damping the harmonic propagation in the distribution system.

Study on Passivity-Based Control of TNPC PV Grid-Connected Inverter

2014 ◽  
Vol 571-572 ◽  
pp. 1000-1005
Author(s):  
Bai Le Zhang ◽  
Jiu He Wang ◽  
Feng Jiao Zhao
Keyword(s):  
Mathematical Model ◽  
Control Theory ◽  
Mathematical Models ◽  
Power Factor ◽  
Harmonic Distortion ◽  
Unity Power Factor ◽  
Simulation Results ◽  
Passivity Based Control ◽  
Grid Connected Inverter ◽  
Pv Grid

Euler-Lagrange (Euler-Lagrange, EL) mathematical model was established according to the topology of TNPC (T-type Neutral Point Clamped) PV grid-connected inverter. Based on the mathematical models and passivity-based control theory, the approach called injecting damping was adopted to design the passivity-based controller of the inverter. The passivity-based controller can decoupled-qaxis current at AC side of the grid and achieve unity power factor, the total harmonic distortion of grid-connected current is low, and the passivity-based controller also make the inverter have good dynamic and static performances. Simulation results show that the designed passive controller of TNPC PV grid-connected inverter is feasible.

scholarly journals Investigation of Power Quality Indices in Jordan University of Science and Technology Grid-Tie Photovoltaic Plant

2020 ◽  
Vol 7 (2) ◽  
Keyword(s):  
Power Quality ◽  
Power Factor ◽  
Capacitor Bank ◽  
Power Grid ◽  
Science And Technology ◽  
Harmonic Distortion ◽  
Photovoltaic System ◽  
Unity Power Factor ◽  
Quality Aspect ◽  
Photovoltaic Plant

In this paper, the effects of the grid-tie photovoltaic plant (PV) are analyzed on the power factor and the voltage harmonic distortion in the power quality aspect of the distribution network. The conditions for the total harmonic distortion (THD) in the power grid related to the photovoltaic power station connected to the user side are also summarized. Based on MATLAB/SIMSCAPE software, one string of the photovoltaic system at the Jordan University of Science and Technology (JUST) was simulated and hence, compared its results with the real results of the system. Measurement and simulation results illustrate that the voltage harmonic distortions to the power grid do not exceed the recommended levels, but the photovoltaic system needs to have a capacitor bank to get a unity power factor.

scholarly journals Single Phase AC to DC Isolated ZETA Power Factor Correction Converter fed LED drives

2020 ◽  
pp. 73-80
Author(s):  
S. T. Siddharthan ◽  
Andrew Jones ◽  
S. Kathikeyan
Keyword(s):  
Power Factor ◽  
High Frequency ◽  
Single Phase ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Supply System ◽  
Unity Power Factor ◽  
Current Harmonic ◽  
High Frequency Transformer ◽  
Bridge Rectifier

This paper deals with PFC-isolated Zeta converter fed LED drive to overcome the power factor problems. The proposed circuit topology consists of diode bridge rectifier and isolated Zeta converter with high frequency transformer. A single –phase supply is used to feed a DBR followed by a filter to avoid any switching ripple in DBR and the supply system. An isolated Zeta converter is operated to work under DCM mode. This combination of DBR and PFC converter is used to feed a LED drive. This converter is simulated in MATLAB platform. This converter provides better results such as unity power factor and less current harmonic distortion.

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