Modelling Grid Tied RE Sources
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Transcript of Modelling Grid Tied RE Sources
Fractional Order Modeling & Control Strategies Fractional Order Modeling & Control Strategies for Grid-Connectedfor Grid-Connected Renewable Energy Renewable Energy
SourcesSources
Major Professor : Dr. ChenMajor Professor : Dr. Chen
Committee members: Dr. Cripps, Dr. Spencer, Committee members: Dr. Cripps, Dr. Spencer, Dr. Wu and Dr. BanDr. Wu and Dr. Ban
Presenter: Hadi MalekPresenter: Hadi Malek
Ph.D. StudentPh.D. StudentElectrical & Computer Engineering DepartmentElectrical & Computer Engineering Department
Utah State UniversityUtah State University
04/27/2012
Email: [email protected]
Outline
New trends in power electronics for applying fractional order calculus (FOC) in grid-connected renewable energy systems.
Advantages of using FOC.
Review of the current system and recent researchers regarding applying FOC.
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Introduction
Increasing number of renewable energy resources and distributed generators
New strategies for the operation and management of the electricity grid
Improve the power-supply reliability and quality
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Power-electronics technology
Plays an important role in distributed generation
Integration of renewable energy sources into the electrical grid
Fast evolution, due to:a. development of fast semiconductor switchesb. introduction of real-time controllers
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– Variable-speed technology – 5% increased efficiency
– Easy control of active and reactive power flows– Rotor acts as a flywheel (storing energy)– No flicker problems– Higher cost
New technologies - wind turbines
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Wind turbine technology
Wind-turbine market has been growing at over 30% a year
Important role in electricity generation Germany and Spain
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Rectifier and chopper
step-up chopper is used to adapt therectifier voltage to the dc-link voltage of the inverter.
driver controlling the torque generator, using a vector controlstrategy
Energy Transfer Control of the active and reactive powers total-harmonic-distortion control
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PV Photovoltaic Technology
PV systems as an alternative energy resource
Complementary Energy-resource in hybrid systems
Solar-electric-energy growth consistently 20%–25% per annum over the past 20 years
1) an increasing efficiency of solar cells1) an increasing efficiency of solar cells2) manufacturing-technology improvements2) manufacturing-technology improvements3) economies3) economies of scale of scale8
PV growth
2001, 350 MW of solar equipment was sold 2003, 574 MW of PV was installed.
In 2004 increased to 927 MW Significant financial incentives in Spain,
Germany, Italy and France triggered a huge growth in demand
http://www.erec.org9
Perspectives
World solar photovoltaic (PV) installations were 2.826 GW peak (GWp) in 2007, and 5.95 GW in 2008
The three leading countries (US, Germany, & Japan) represent nearly 89% of the total worldwide PV installed capacity.
In 2012, 12.3GW- 18.8GW (expected!)10http://www.renewableenergyworld.com
Efficiency
Market leader in solar panel efficiency (measured by energy conversion ratio) is SunPower, (San Jose USA) - 23.4%
market average of 12-18%. (http://www.sroeco.com)
Efficiency of 42% achieved at the University of Delaware in conjunction with DuPont (concentration) in 2007.
The highest efficiency achieved without concentration is by Sharp Corporation at 35.8% using a proprietary triple-junction manufacturing technology in 2009.
11 G. Pilawjian , “Analysis of Photovoltaic Concentrating Solar Energy Systems”, ARPN Journal of Systems and Software VOL. 2, NO. 3, March 2012.
ON Grid – OFF Grid
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Power-Quality Requirements for Grid-Connected RES
Flicker + interharmonicsinterharmonics Anti-Islanding Voltage Fault Ride Through Capability Standards (IEEE, NEC, IEC, …)
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Requirements
K. Fujii1, N. Kanao, T. Yamada1, Y. Okuma, “Fault Ride Through Capability for Solar Inverters”, Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on , vol., no., pp.1-9, Aug. 30 2011-Sept. 1 2011
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Islanding
Islanding is the continued operation of the inverter when the grid has been removed on purpose, by accident, or by damage
Detection schemes - active and passive. 1. The passive methods -monitor grid
parameters.2. The active schemes introduce a disturbance
into the grid and monitor the effect.
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Islanding
PV Generator Converter AC-DC Local Loads Grid16
Standards
1. Flicker analysis2. Switching operations. Voltage and current
transients3. Harmonic analysis (FFT) - rectangular
windows of eight cycles of fundamental frequency. THD up to 50th harmonic
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TThe standards he standards EN61000-3-2, IEEE1547, U.S. National Electrical Code (NEC) 690 IEC61727
power quality, detection of islanding operation, grounding
structure and the features of the present and future PV modules.
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Standards
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Maximum Power Point Tracker
EX.: ripple voltage should be below 8.5% of the MPP voltage in order to reach a utilization ratio of 98%
S.B. Kjaer, Member, J. K. Pedersen, F. Blaabjerg, “A Review of Single-Phase Grid-Connected Inverters for Photovoltaic Modules”, IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 41, NO. 5, OCT 200520
High efficiency
Wide range of input voltage and input power Very wide ranges as functions of solar irradiation and ambient temperature.
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Fractional Order Calculus
Definitions Why Fractional Order Calculus? What have been done? What’s the plan?
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Fractional Order Calculus
Reimann-Liouville Definition:
Caputo Definition:
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Laplace Transform
Fractional Order Calculus
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Fractional Order Calculus
I. Podlubny, “Geometric and physical interpretation of fractional integration and fractional differentiation”, Fractional Calculus and Applied Analysis, vol. 5, no. 4, pp. 367– 386, 2002.
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Fractional Order Calculus(Why?)
Stability
Is BIBO stable if:
Ivo Petras, “STABILITY OF FRACTIONAL-ORDER SYSTEMS WITH RATIONAL ORDERS: A SURVEY”, Fractional Calculus & Applied Analysis, Vol 12, No. 3, 2009
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Fractional Order Calculus(Why?)
Robustness
27 Y.Q. Chen, H.S. Ahn and I. Podlubny, “Robust Stability Check of Fractional Order Linear Time Invariant Systems With Interval Uncertainties”, Proceedings of the IEEE International Conference on Mechatronics & Automation Niagara Falls, Canada • July 2005
Fractional Order Calculus
More Degree of Freedom Better Time Domain Specification
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Fractional Order Calculus(Why?)
Nature of Input
Z. J. Ye X., Xia X. and Y.Q. Chen, “Fractional analysis and synthesis of the variability of irradiance and pv power time series,” in FDA, (China), May 2012.
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Fractional Order Calculus(Why?)
Nature of the System
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Fractional Order Calculus(Why?)
Nature of the System
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Fractional Order Calculus(Done!)
Wind TurbineR. Melício, V.M.F. Mendes, J.P.S. Catalão, Fractional-order control and simulation of wind energy systems with PMSG/full-power converter topology, Energy Conversion and Management, Volume 51, Issue 6, June 2010, Pages 1250-1258.
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Fractional Order Calculus(Done!)
FO Controller for Three Level MNP Inverter
K. Arab-Tehrani, T. Capitaine, Ludovic Barrandon , M. Hamzaoui, S.M.R.Rafiei and A. Lebrun, “Current Control Design with a Fractional-Order PID for a Three-Level Inverter” FDA2012.
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Fractional Order Calculus(Done!)
FO Controller for Three Level MNP Inverter
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Fractional Order Calculus(Done!)
FO Controller for DC-DC Buck Converter
A.J. Calder´on, B. V. Vinagre, and V. Feliu. Fractional Order Control of a Power Electronics Buck Converter. In Proceeding of the 5th Portuguese Conference on Automatic Control 2002 (Controlo 2002) , pages 365–370, September 5th Portuguese Conference on Automatic Control.
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Fractional Order Calculus (Feasibility!)
Analoge Implementation
Gary W. Bohannan, “Analog Realization of a Fractional Control Element”, October 27, 200236
Fractional Order Calculus (Feasibility!)
Digital Implementation
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Research Plan
Grid-Connected PV System
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Research Plan
Irradiation
http://www.mavericksolar.net/39
Research Plan
FO MPPT
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Research Plan
FO MPPT
http://www.mpoweruk.com41
Research Plan
FO MPPT (Extremum Seeking Control)
M. Krstic & H.H. Wang, Automatica, 36, 2000.42
Research Plan
FO MPPT (Extremum Seeking Control)
Ref: S.L. Brunton, C.W. Rowley, R.K. Sanjeev, C. Clarkson, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 10, OCTOBER 2010
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Research Plan
Traditional Control Strategy
Zhang, Jianzhong; Cheng, Ming; , "DC link voltage control strategy of grid-connected wind power generation system," Power Electronics for Distributed Generation Systems (PEDG), 2010 2nd IEEE International Symposium on , vol., no., pp.970-975, 16-18 June 2010
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Research Plan
FO DC Link Voltage Control
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Research Plan
FO Current Control Loop
Romero-Cadaval, E.; Milanes-Montero, M.I.; Gonzalez-Romera, E.; Barrero-Gonzalez, F.; , "Power Injection System for Grid-Connected Photovoltaic Generation Systems Based on Two Collaborative Voltage Source Inverters," Industrial Electronics, IEEE Transactions on , vol.56, no.11, pp.4389-4398, Nov. 2009
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Research Plan
FO Current Control Loop
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Research Plan
FO Filtering
K. Fujii1, N. Kanao, T. Yamada1, Y. Okuma, “Fault Ride Through Capability for Solar Inverters”, Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on , vol., no., pp.1-9, Aug. 30 2011-Sept. 1 2011 48
Research Plan
FO Filtering
G. Shen, D. Xu, L. Cao, and X. ZhuAn, “Improved Control Strategy for Grid-Connected Voltage Source Inverters With an LCL Filter”, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 4, JULY 2008.
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Plan
Developing better fractional order models of inputs and converter devices such as DC/DC converters, Voltage Source Inverter (VSI) or Current Source Inverter (ISI) and storage devices.
Developing better control techniques based on these newly developed models
Dialyzing and comparing several modeling topologies and control strategies.
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Timeline
Irradiation Modeling 1. Review current estimation methods.
2. Applying FO estimation to experimental data and comparison with other methods
2 month
Boost Converter 1. Design and Implementation of FO MPPT (Simulation)
2. Analyses (Stability, …) & tuning
3. Performance Evaluation4. Comparison the efficiency
4 month
Inverter 1. Review current control strategies
2. Applying and tuning FO controllers to VSC and ISC & analyzing the results (Simulation)
3. Comparison with traditional strategies.
4 month
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Timeline
Filtering 1. Apply & tuning FO filters to the system
2. Analysis (Stability, time domain specification, freq. domain specification, …)
2 month
Overall 1. Design and Implementation of overall system with FO controllers and filters
2. Analyses (Stability, Robustness, …) & tuning
3. Performance Evaluation4. Calculate and comparison
the efficiency
2 month
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Thank You!
Questions?
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