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Time filter

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Fredericton, Canada

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. Source


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. Source


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. Source


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. Source


Elbakush E.,University of New Brunswick | Sharaf A.M.,Sharaf Energy Systems Inc.
International Journal of Tomography and Statistics | Year: 2013

This paper presents a Novel V2H Battery Charging Scheme using FACTS based low impact battery charging scheme, to improve the power quality, reduce total harmonic distortion, decrease AC and DC inrush currents, and provide device voltage stabilization. The FACTS is fully stabilized using a hybrid Green Power Filter Compensator (GPFC), that ensures a fully stabilized Common-DC Bus voltage with reduced inrush current conditions. In the same time, The novel FACTS device is a AC-DC coupling neutral point filter compensation (NP-SFC) which is connected between AC and DC sides of the converter and increases the level of power. Green pure Filter Compensation and neutral point filter compensation (NP-SFC) Scheme for V2H Battery Charging Stations with a novel multi regulators multi loop error driven control strategy to ensure fast charging, minimal impact on host electric grid and efficient utilization of grid-connected battery charging scheme with effective AC-DC decoupling and stabilization of the DC Common Bus Voltage. The self regulating battery charging multi-regulator control scheme has been fully validated using. The Battery Charging FACTS Based V2H Station is controlled by a Multi-loop error driven regulators to ensure near unity power factor operation, reduced harmonic distortion and decoupled AC-DC Grid Operation. The battery charger has a hybrid Voltage-Current Regulation. The proposed basic and NP-SFC FILTER compensated V2H-Battery Charging schemes are effective in ensuring minimal decoupled AC-DC operation and Efficient low impact on the Electric Grid. © 2013 by CESER PUBLICATIONS. Source

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