A New Central Control Scheme for Future Micro-Grid Systems Considering Variable Speed Drive Systems and Fuzzy Logic Control System

2019 ◽  
Vol 8 (2) ◽  
pp. 25-46
Author(s):  
Safwan Mhrez Nadweh ◽  
G. Hayek ◽  
Bassam Atieh
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Electrical Power ◽  
Variable Speed ◽  
Nonlinear Loads ◽  
Distortion Factor ◽  
Variable Speed Drive ◽  
Grid Systems ◽  
Micro Grid ◽  
Drive Systems

The increased use of nonlinear loads in power systems have caused problems with the quality of electrical power systems, which affects its performance. One of the most important nonlinear loads is variable speed drive systems (VSDS) which causes issues to the industrial plants power supply. In this article, the authors compare different control methods to apply the bias voltages required to operate transistors in the four-quadrant chopper which added to the dc- link of the variable-speed drive system in order to improve power quality, considering future micro-grid systems. A selection is then made of the appropriate one that improves power quality specifications. This article discusses the issues related to VSDS, such as total harmonic distortion factor THD%; the ripple factor of the DC current and voltage of the VSDS; and its harmful effects on the power system.

Power Quality and Stability Analysis of Variable-Speed Drive Systems (VSDS)

2019 ◽  
pp. 387-411
Author(s):  
Safwan Mhrez Nadweh ◽  
Ola Ahmad Khaddam
Keyword(s):  
Stability Analysis ◽  
Power Quality ◽  
Open Loop ◽  
Variable Speed ◽  
Crest Factor ◽  
Variable Speed Drive ◽  
Control Loops ◽  
Quality Specifications ◽  
Drive Systems

This chapter introduces an analysis of power quality of variable-speed drive systems (VSDS). In this chapter, several issues have been discussed as VSDS in terms of cost and effectiveness, VSDS control loops (open loop, closed loop), and power quality in VSDS. Harmonics standards and harmonics in VSDS were discussed in this chapter in addition to highlighting the effects of harmonics on power factor, crest factor, and other power quality specifications. The solutions used to mitigate the harmonics in VSDS were discussed in detail. Finally, simulation of the conventional VSDS model and VSDS with one harmonic mitigation solution in order to clarify the usefulness of using this solution on power quality specifications were discussed.

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.

Introduction to Smart Grid and Micro-Grid Systems

2022 ◽  
pp. 1-20
Author(s):  
Safwan Nadweh ◽  
Zeina Barakat
Keyword(s):  
Smart Grid ◽  
Power Systems ◽  
Smart Grids ◽  
Communication Systems ◽  
Electrical Power ◽  
Operating Conditions ◽  
Electrical Power Systems ◽  
Grid Systems ◽  
Micro Grid ◽  
Micro Grids

This chapter describes the upcoming technology for electrical power systems that gives the appropriate solution for the integration of the distributed energy resources. In this chapter, different categories of smart grids have been classified, and the advantages, weakness, and opportunities of each one, are given in addition to determining its own operating conditions. Micro-grids are the most common kind of smart grid. It has been classified under different criteria, such as architecture with different topology (connected mode, island mode, etc.) and demand criteria (simple micro grids, multi-DG, utility) and by capacity into simple micro-grid, corporate micro-grid, and independent micro-grid, and by AC/DC type to DC micro-grids, AC micro-grids, Hybrid micro-grids. Finally, most familiar Micro-grid components have been discussed such as an energy management system along with several types of control and communication systems in addition to the economic study of a micro-grids.

Introduction to Smart Grid and Micro-Grid Systems

2019 ◽  
pp. 347-366
Author(s):  
Safwan Nadweh ◽  
Zeina Barakat
Keyword(s):  
Smart Grid ◽  
Power Systems ◽  
Smart Grids ◽  
Communication Systems ◽  
Electrical Power ◽  
Operating Conditions ◽  
Electrical Power Systems ◽  
Grid Systems ◽  
Micro Grid ◽  
Micro Grids

This chapter describes the upcoming technology for electrical power systems that gives the appropriate solution for the integration of the distributed energy resources. In this chapter, different categories of smart grids have been classified, and the advantages, weakness, and opportunities of each one, are given in addition to determining its own operating conditions. Micro-grids are the most common kind of smart grid. It has been classified under different criteria, such as architecture with different topology (connected mode, island mode, etc.) and demand criteria (simple micro grids, multi-DG, utility) and by capacity into simple micro-grid, corporate micro-grid, and independent micro-grid, and by AC/DC type to DC micro-grids, AC micro-grids, Hybrid micro-grids. Finally, most familiar Micro-grid components have been discussed such as an energy management system along with several types of control and communication systems in addition to the economic study of a micro-grids.

Performance Analysis of Unified Power Quality Conditioner for Power Quality Improvement

2014 ◽  
Vol 573 ◽  
pp. 690-695
Author(s):  
Ragavan Saravanan ◽  
P.S. Manoharan
Keyword(s):  
Power Quality ◽  
Control Algorithm ◽  
Electrical Power ◽  
Frame Theory ◽  
Nonlinear Loads ◽  
Unified Power Quality Conditioner ◽  
Synchronous Reference Frame ◽  
Power Quality Improvement ◽  
Linear And Nonlinear ◽  
Power Quality Conditioner

The Unified Power Quality Conditioner plays an important role in the constrained delivery of electrical power from a source to an isolated pool of load or from a source to the grid. This article is presented new control approaches for both series and shunt inverter. The proposed control algorithm for series and shunt converters based on FLC and synchronous reference frame theory respectively. The proposed approach eliminates the total harmonic distortions (THD) efficiently, and mitigates sag and swell present in the linear and nonlinear loads.

Power Quality Issues and Solutions – Review

2015 ◽  
Vol 16 (4) ◽  
pp. 357-384 ◽  
Author(s):  
Suresh Mikkili ◽  
Anup Kumar Panda
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Reactive Power ◽  
Electrical Power ◽  
Economic Loss ◽  
Nonlinear Loads ◽  
Broad Perspective ◽  
Three Phase ◽  
Quality Issues

Abstract Electrical power quality has been an important and growing problem because of the proliferation of nonlinear loads such as power electronic converters in typical power distribution systems in recent years. Particularly, voltage harmonics and power distribution equipment problems result from current harmonics produced by nonlinear loads. The Electronic equipment like, computers, battery chargers, electronic ballasts, variable frequency drives, and switch mode power supplies, generate perilous harmonics and cause enormous economic loss every year. Problems caused by power quality have great adverse economic impact on the utilities and customers. Due to that both power suppliers and power consumers are concerned about the power quality problems and compensation techniques. Power quality has become more and more serious with each passing day. As a result active power filter gains much more attention due to excellent harmonic and reactive power compensation in two-wire (single phase), three-wire (three-phase without neutral), and four-wire (three-phase with neutral) ac power networks with nonlinear loads. However, this is still a technology under development, and many new contributions and new control topologies have been reported in the last few years. It is aimed at providing a broad perspective on the status of APF technology to the researchers and application engineers dealing with power quality issues.

EMC Installation for Variable Speed Drive Systems (VSDs)

2019 ◽  
pp. 308-329
Author(s):  
Safwan Nadweh ◽  
Zeina Barakat ◽  
Ghassan Hayek
Keyword(s):  
Motor Control ◽  
Electromagnetic Fields ◽  
Capacitive Coupling ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Drive Systems

This chapter introduces EMC installation for variable speed drive systems. As an introduction, EMC standards have been mentioned in order to define the requirements characteristics, besides the fundamentals of static, electric, magnetic, and electromagnetic fields. Both inductive and capacitive coupling have been discussed to deal with shielding. Finally, VSDS emission and electromagnetic interferences were studied with installation requirement in VSDS (supply cables, cable between converter and motor, control cables, earthing requirements, and grounding).

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