Integrated Nine-Switch Power Converter Based on Discontinuous Pulse-Width Modulation

2012 ◽  
Vol 214 ◽  
pp. 71-75
Author(s):  
Qin Wang
Keyword(s):  
Power Quality ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Unified Power Quality Conditioner ◽  
Attractive Option ◽  
In Series ◽  
Switch Power ◽  
Power Quality Conditioner

This paper evaluates the shortcomings of the application experience before nine-switch the newly proposed converter. A better understanding of development, the conclusion is, nine-switch converter is not an attractive option "alternative of two consecutive converter parallel of the bridge. Instead, nine-switch converter is more suitable for replace back-to-back inverter in" series-shunt "of the system, in a good example is the unified power quality conditioner.

scholarly journals Improving Electrical Power Quality in Distribution Networks using a Unified Power Quality Conditioner (UPQC) Controlled by an Adaptive Hysteresis Band

2021 ◽  
Vol 23 (2) ◽  
pp. 91-109
Author(s):  
Marah Mariam ◽  
◽  
Hassan Kenjrawy
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Electrical Power ◽  
Distribution Networks ◽  
Electrical Power Systems ◽  
Distortion Factor ◽  
Unified Power Quality Conditioner ◽  
Power Quality Conditioner

Recently the use of sensitive electronic devices has increased, and the quality of energy has become an important factor in electrical power systems, where disturbances occurring in the network (harmonics, swell, voltage sag, etc.) affect consumers and lead to technical-economic damages. One of the most prominent solutions to address energy quality problems is the UPQC (Unified Power Quality Conditioner). In this paper, the unified power quality conditioner used to improve the electrical power quality in the distribution networks was discussed, where the Park transformations are used to obtain the required reference signals, and also the use of adaptive hysteresis band to generate the electronic switch pulses in both serial and shunt switches, where the pulse width is determined by dependence on fuzzy logic. The studied system was validated by simulating different distortion cases and comparing the results when using the Sinusoidal Pulse Width Modulation (SPWM) to control the two switches. The results showed improvement in the electrical power quality through the use of an adaptive hysteresis band controller, and that appeared by reducing the total distortion factor (THD%), which resulted in improving the shape of both the voltage and current waveforms.

Unified Power Quality Conditioner Using Injection Capacitors for Voltage Sag Compensation

2017 ◽  
Vol 6 (1) ◽  
pp. 36
Author(s):  
Madhusmita Patro ◽  
Kanhu Charan Bhuyan
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Power Factor ◽  
Supply Voltage ◽  
Voltage Source ◽  
Distortion Compensation ◽  
Unified Power Quality Conditioner ◽  
Three Phase ◽  
In Series ◽  
Power Quality Conditioner

<p>Power quality has become an important factor in power systems, for consumer and household appliances. The main causes of poor power quality are harmonic currents, poor power factor, supply voltage variations etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply voltage variations at load side is compensated by unique device UPQC presented in this thesis. This concept presents a multi loop based controller to compensate power quality problems through a three phase four wire unified power quality conditioner (UPQC) under unbalanced and distorted load conditions. Here the UPQC is constituted of two voltage source converters (VSC) connected via power link. The series compensator is connected to the line in series and injects the voltage and thus compensates for voltage issues; whereas the shunt compensator injects current thus compensating for current issues, and is connected in shunt to the line. The voltage injection to the line uses an injecting transformer. The injection transformer is later replaced with injection capacitors, thus eliminating the drawback of conventional UPQC. In this way a good power quality is maintained.</p>

Unified Power Quality Conditioner Using Injection Capacitors for Voltage Sag Compensation

2017 ◽  
Vol 6 (1) ◽  
pp. 35
Author(s):  
Madhusmita Patro ◽  
Kanhu Charan Bhuyan
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Power Factor ◽  
Supply Voltage ◽  
Voltage Source ◽  
Distortion Compensation ◽  
Unified Power Quality Conditioner ◽  
Three Phase ◽  
In Series ◽  
Power Quality Conditioner

<p>Power quality has become an important factor in power systems, for consumer and household appliances. The main causes of poor power quality are har ue of achieving active current distortion compensation, power factor monic currents, poor power factor, supply voltage variations etc. A techniq correction and also mitigating the supply voltage variations at load side is compensated by unique device UPQC presented in this thesis. This concept presents a multi loop based controller to compensate power quality problems through a three phase four wire Unified Power Quality Conditioner (UPQC) under unbalanced and distorted load conditions. Here the UPQC is constituted of two Voltage Source Converters (VSC) connected via power link. The series compensator is connected to the line in series and injects the voltage and thus compensates for voltage issues; whereas the shunt compensator injects current thus compensating for current issues, and is connected in shunt to the line. The voltage injection to the line uses an ijecting transformer. The injection transformer is later replaced with injection capacitors, thus eliminating the drawback of conventional UPQC. In this way a good power quality is maintained</p>

scholarly journals Unified Power Quality Conditioner using PV Fed SVPWM based Multilevel Converters for Power Quality Improvement

2020 ◽  
Vol 9 (6) ◽  
pp. 1060-1064
Keyword(s):  
Power Quality ◽  
Pulse Width Modulation ◽  
Multilevel Converters ◽  
Nonlinear Load ◽  
Pv Array ◽  
Common Mode Voltage ◽  
Unified Power Quality Conditioner ◽  
Power Quality Improvement ◽  
Power Quality Conditioner ◽  
Shunt Compensation

This paper presents a solar photovoltaic based unified power quality conditioner (PV-UPQC). The proposed system consists of a shunt compensator (ShC), series compensator (SeC) and PV array connected in parallel to a common dc-link. A three-level diode clamped multilevel inverter configuration is used as shunt and series converters. The SVPWM technique provides reduction in the common mode voltage and the balancing of the dc link voltage. The shunt compensation converter extracts power from PV array and provides compensation for load harmonic currents. The series compensation converter compensates for the power quality (PQ) problems such as grid voltage sags/swells and source harmonic voltages. The proposed system utilizes space vector pulse width modulation (SV-PWM) in multilevel converter topology for the mitigating the power quality problems using PV-UPQC. The proposed system improves PQ and also utilize RES, it also simultaneously improves both current and voltage disturbances. The performance of the system is analyzed in MATLAB/Simulink for nonlinear load conditions.

scholarly journals Power Quality Mitigation by Generalized Unified Power Quality Conditioner

2019 ◽  
Vol 8 (2) ◽  
pp. 783-787
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Voltage Source ◽  
Unified Power Quality Conditioner ◽  
Different Types ◽  
In Series ◽  
Non Linear Load ◽  
Power Quality Conditioner ◽  
Compensating Devices ◽  
Custom Power

The network reconfiguring and compensating devices are the two different types of custom power solutions. The network reconfiguration devices consist of switchgear with current breaking, current restrict and current sending devices. The compensating device will compensate load by correcting power factor, unbalance etc. or supplied voltage quality will be improved. These devices are either connected in shunt (DSTATCOM) or in series (DVR) or a combination of both (UPQC) are the different types of custom power devices. This paper proposes compensating custom power device formed by the 3-phase, 3-level voltage source converters (VSC’s) connected one on another through a common dc link to three independent feeders distribution system, which is known as Generalised unified power quality conditioner (G-UPQC). Simulations are performed using MATLAB/SIMULINK package to mitigate current imperfections in first feeder which is connected with unbalanced and Non-linear load and voltage imperfections in the other two feeders which are connected with unbalanced and sensitive loads

scholarly journals Optimal Sizing of UPQC to Mitigate Power Quality Issues Using ANF Controller

2018 ◽  
Vol 7 (4.10) ◽  
pp. 41
Author(s):  
Senthil Vadivu U. ◽  
B. K. Keshavan
Keyword(s):  
Power Quality ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulation ◽  
Switching Losses ◽  
Quality Issues ◽  
Fuzzy Control Strategy ◽  
Non Linear Load ◽  
Power Quality Conditioner ◽  
The Cost

A design of compact converter based Unified Power Quality Conditioner (UPQC) is proposed to alleviate the power quality issues on both linear and non-linear load by means of a four switch three phase series and shunt converter with DC link capacitor. DC-link voltage regulation is obtained by Photovoltaic based boost converter. The recommended four switch converter system not only reduces the switching losses but also the cost of the converter as well as it reduces the number of active elements.  Balancing of capacitors leg, filters and transformer are chosen based on the amount of sag and swell magnitude. The proposed scheme is implemented using sinusoidal pulse width modulation, simple space vector pulse width modulation and PI-Fuzzy control strategy to verify power quality issues like sag, swell and harmonics compensation added with the control performances. The performance of the optimized system is validated through simulations using MATLAB/SIMULINK.  

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