Fredericton, Canada
Fredericton, Canada

Time filter

Source Type

Sharaf A.M.,Sharaf Energy Systems Inc. | Khaki B.,Amirkabir University of Technology
INISTA 2012 - International Symposium on INnovations in Intelligent SysTems and Applications | Year: 2012

This paper presents a novel hybrid series-parallel switched/modulated FACTS-based filter/compensation scheme (SCC) developed by the First Author for smart grid applications. The proposed FACTS filter/compensation device comprises a hybrid series and shunt switched capacitor-banks controlled by a dynamic time decoupled multi-regulator multi-loop error driven inter-coupled Weighted-Modified PID (WMPID) controller. The effectiveness of the proposed low cost Pulse Width Modulated (PWM) scheme is validated using MATLAB-Simulink digital simulation results. The coordinated dynamic controller ensures FACTS device effectiveness in limiting inrush current conditions, enhancing bus voltage stabilization, improving feeder voltage regulation, reducing total harmonic distortion, and enhancing power factor at both source and load buses. The unified AC system was validated for both normal operation and load change conditions. © 2012 IEEE.

Khaki B.,Amirkabir University of Technology | Sharaf A.M.,Sharaf Energy Systems Inc.
International Journal of Renewable Energy Research | Year: 2013

The paper presents a flexible hybrid FACTS based AC-DC interface scheme with Flexible AC Transmission System Neutral Point Switched Filter Compensator (NPSFC) stabilization scheme developed by the Second Author to improve power quality and energy utilization in future Smart Grid-V2G Electric Vehicle (EV) Fast Battery Charging Stations. The FACTS-based filter compensation scheme proposed in this paper is equipped with a novel multi-loop dynamic error driven time de-scaled controller to enhance power factor, stabilize AC and DC side Common Bus voltages, ensure efficient energy utilization, and halt inrush current especially under fast battery charging modes. The FACTS-based hybrid filter compensator is a pulse width modulated/switched capacitor compensation scheme which uses IGBT/MOSFET switches. In addition, a revised controller is designed to improve the utilization of the DC bus voltage in combination with a Green Plug Filter Compensator (GPFC) device. GPFC device is controlled by a novel dual-loop controller which handles the voltage and current of the DC side of the rectifier. Output signals of the controllers are the inputs for a weighted-modified-PID which its output feeds the sinusoidal Pulse Width Modulation (PWM) block. In other words, the control signals of the controllers are used for regulating the PWM (on-off) pulsing sequences. The unified scheme is validated using MATLAB/SIMULINK toolbox.

Sharaf A.M.,Sharaf Energy Systems Inc. | Aktaibi A.A.,Memorial University of Newfoundland
INISTA 2012 - International Symposium on INnovations in Intelligent SysTems and Applications | Year: 2012

This This paper presents a novel dynamic based Stabilization Scheme and Smart-Stabilization Coordinated Control strategy developed by the First Author for a hybrid micro grid Village Electricity Integrated Utilization Scheme using Photovoltaic PV, Fuel Cell FC, wind Turbine and backup Diesel generation renewable generation system. The Proposed Micro Grid is fully interfaced using a Common fully stabilized Collection Bus. The scheme is fully stabilized using a novel based Filter Compensation Scheme (FCS) ensuring that the diesel generator set is only utilized when the demand electric energy exceeds the aggregate PV, FC and the Wind Turbine total energy capacity within specified operational levels to ensure highest efficient operation of the renewable energy sources with the backup diesel engine. The novel Smart Dynamic Error Driven Variable Structure-Sliding Mode Controller is used for the - Modulated Filter Compensator with a PI - controller for efficient utilization of the Back-Up Diesel Gen-Set ensure the objectives of a safe decoupled interface with maximum green energy utilization and enhanced power quality of the hybrid renewable energy scheme. The Hybrid Scheme is validated using Mat lab/Simulink Software Environment. © 2012 IEEE.

Abdelsalam A.A.,Suez Canal University | Sharaf A.M.,Sharaf Energy Systems Inc.
International Conference on Smart Energy Grid Engineering, SEGE 2015 | Year: 2015

This paper proposes a novel custom power device based on distribution static compensator (DSTATCOM) with PID controller driven by the unified error signal (UES) from a multi loop dynamic error controller scheme. Both DSTATCOM and UES are modified to meet the requirements for voltage stabilization, voltage waveform disturbance compensation and power factor improvement. A complete simulation model of the proposed system is developed in Matlab/Simulink Environment. The system is simulated with different control strategies under different operating conditions for comparison. The controllers and the control strategies are developed to have the novel DSTATCOM be operated for voltage stabilization, power factor improvement, energy losses reduction, power quality, and less harmonics distortion. The operational characteristics of a power system, supplying electrical power to hybrid loads consisting of linear and nonlinear and motorized loads, are investigated for better performance and higher power quality employing the proposed DSTATCOM and UES driven controllers. © 2015 IEEE.

Sharaf A.M.,Sharaf Energy Systems Inc. | Gandoman F.H.,University of Kurdistan
International Conference on Smart Energy Grid Engineering, SEGE 2015 | Year: 2015

The paper presents a Shunt Filter Compensator-FACTS DVS/Green Plug filter/Dynamic Voltage Stabilization device developed by the First Author as a new member of Switched/Modulated Shunt LC Compensation devices for Dynamically Modulating AC Bus Admittance for stabilized and efficient energy transfer utilization, Dynamic Voltage stabilization DVS- for nonlinear loads on smart grid is required as the grid network becomes weak and insecure, especially with new Distributed Generation (DG) interface and use of Wind/Photovoltaic and battery storage systems. The FACTS-DVS/GP is validated using MATLAB-Simulink Digital Simulation Environment varying load and system conditions including open circuit and short circuit fault conditions and load-excursions/ load reductions. The coordinated, multi-regulation, inter coupled dynamic controller scheme ensures the FACTS-DVS/GP device effectiveness in improving system security, energy utilization, power factor, power quality at key AC Buses, while reducing inrush currents and transient over-voltage/switching Recovery Voltage excursions. Hence, improving dynamic voltage stabilization, feeder regulation and power quality/factor enhancement. © 2015 IEEE.

Ozkop E.,Karadeniz Technical University | Sharaf A.M.,Sharaf Energy Systems Inc. | Altas I.H.,Karadeniz Technical University
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2016

This paper introduces an adaptive fuzzy PI controller (AFPIC) for a exible AC transmission system (FACTS)- based dynamic power filter (DPF) to be used in wave energy conversion systems. The new FACTS device stabilizes the DC-common bus voltage, reduces quality of power troubles, and enhances energy utilization by acting as a bus quantity enhancer (BQE). The design and realization of the proposed FACTS-based DPF and efficient control schemes are fully studied. To validate the efficiency of the proposed BQE FACTS device, a digital simulation model and a laboratory test system are developed in the MATLAB/Simulink/Simpower software environment for comparison. Various experimental test models of the proposed BQE system and dynamic error-based controller structures have been utilized to verify the simulation results. It has been shown that the utilization of the proposed AFPIC with the novel BQE device and multivariable error driven control strategy is very effective to eliminate stochastic wave inuences on voltage on the load side and load variations on the source side by decreasing voltage sag and swells. The effectiveness of the BQE is also tested by applying error energy-based performance indices ISE, IAE, and ITAE. © 2016 Tübitak.

Abdelsalam A.A.,Suez Canal University | Desouki M.E.,King Abdulaziz University | Sharaf A.M.,Sharaf Energy Systems Inc.
Journal of Electrical Systems | Year: 2013

This paper presents a novel modulated power filter compensator (MPFC) scheme for the smart grid stabilization and efficient utilization. The MPFC is controlled by a novel tri-loop dynamic error driven inter coupled modified VSC controller. The Matlab digital simulation models of the proposed MPFC scheme has been fully validated for effective power quality (PQ) improvement, voltage stabilization, power factor correction and transmission line loss reduction. The proposed FACTS based scheme can be extended to distributed/dispersed renewable energy interface and utilization systems and can be easily modified for other specific stabilization, compensation requirements, voltage regulation and efficient utilization. © JES 2013.

Norouzi M.R.,Islamic Azad University | Ahmadi A.,Islamic Azad University at Science and Research of Fars | Sharaf A.M.,Sharaf Energy Systems Inc. | Esmaeel Nezhad A.,Islamic Azad University at Najafabad
Electric Power Systems Research | Year: 2014

This paper proposes a new technique based on lexicographic optimization and ε-constraint method to solve the combined economic emission scheduling problem of hydrothermal systems comprising several equality constraints as well as non-equality ones. The hydrothermal scheduling problem is modeled as a multi-objective problem with two objective functions as fuel cost minimization and also pollutant emission minimization. After deriving the Pareto set, the most preferred solution is determined using a fuzzy satisfying method. The thermal plants are considered with valve point effect and emission level function. Besides, this paper has taken into consideration the multi-reservoir cascaded configuration of hydro units, while the relationship considered between water discharge rate and power generated through these hydro units is nonlinear. Also, there is a water transport delay between hydro units. The presented model is implemented on a sample test system comprising four cascaded hydro units and three thermal units to verify the efficiency of the proposed method. Furthermore, the proposed method is implemented on IEEE 118 bus test case. The results obtained from the simulation show the effectiveness of the presented technique in the case of fuel cost and emission output compared to other approaches recently used. © 2014 Elsevier B.V.

Vieira R.J.,GreenBolt Consulting Ltd | Sharaf A.M.,Sharaf Energy Systems Inc.
Canadian Conference on Electrical and Computer Engineering | Year: 2014

Megawatt scale wind turbines have become the unit of choice in commercial wind farms. Throughout the world wind energy penetration levels continue to rise with many countries having installed wind farm nameplate capacity in excess of ten percent of the national grid. This paper presents an analytical model of a two megawatt permanent magnet synchronous generator directly connected to the wind turbine rotor shaft. Directly connected permanent magnet generators with full scale AC-DC-AC controllers have found favor within the industry because of their lower maintenance and manufacturing costs and ease of grid integration. This paper will present a full analytical model of the wind turbine and the AC-DC-AC controller connected to a stiff utility grid along with their solutions in the time domain. Space vector modulation is utilized for gating the power electronics devices. © 2014 IEEE.

Jolfaei M.G.,Islamic Azad University at Naragh | Sharaf A.M.,Sharaf Energy Systems Inc. | Shariatmadar S.M.,Islamic Azad University at Naragh | Poudeh M.B.,Islamic Azad University at Naein
International Journal of Electrical Power and Energy Systems | Year: 2016

Nonlinear and fast quasi dynamic type loads of different time-varying ranges are introduced to the electric grid systems due to renewable Energy, distributed Generation and Power electronic AC-DC-AC interface converters used in several parts of the power network, the dynamic small signal electromechanical modes are destabilized and dynamic stability limits of AC system is reduced. FACTS - Flexible AC Transmission Devices with conventional coordinated power system Stabilizers are utilized to improve dynamic stability margins and damp unstable and oscillatory electromechanical modes of oscillations. Coordinated Flexible Soft Computing Control Strategies are proposed for damping modes of through supplementary damping torques provided by Static Synchronous Series Compensator - SSSC in addition to classical Power System stabilizers - PSS. To coordinate the dual action of both SSSC and PSS devices a Genetic algorithm Tuning Controller is applied. The dynamic simulation results for optimized controllers are validated using Matlab/Simulink Software Environment. © 2015 Elsevier Ltd. All rights reserved.

Loading Sharaf Energy Systems Inc. collaborators
Loading Sharaf Energy Systems Inc. collaborators