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SSD2014 Invited keynote: Research challenges in Microgrid technolgies

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microgrid could be defined as a part of the grid with elements like distributed energy sources, power electronics converters, energy storage devices and controllable local loads that could operate autonomously islanded but also interacting with the main power network in a controlled, coordinated way. Following the introduction of distributed control of these elements, cooperative control and hierarchical control schemes for coordination of the power electronics converters in order to control the power flow and to enhance the power quality will be elaborated. The focus will be on the analysis, modelling, and control design of power electronics based microgrids as well as power electronics control and communications. Further, the interconnection of microgrid clusters will be emphasized as an important step towards utilization of the Smartgrid concept.

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SSD2014 Invited keynote: Research challenges in Microgrid technolgies

  1. 1. RESEARCH CHALLENGES IN MICROGRID TECHNOLOGIES PostDoc - DFF Juan C. Vasquez juq@et.aau.dk Professor Josep M. Guerrero joz@et.aau.dk
  2. 2.  Microgrid Definition and Operation  Microgrid Research Programme in AAU  Microgrid Research activities and laboratories International Conference on Power Electrical Systems - SSD 2014 2
  3. 3. Hybrid AC/DC Microgrids What is a Microgrid? Household appliances and electronics PCC DC Coupled Subsystem Main Utility Grid International Conference on Power Electrical Systems - SSD 2014 3
  4. 4. Modes of Operation: ISLANDED Household appliances and electronics PCC DC Coupled Subsystem Main Utility Grid International Conference on Power Electrical Systems - SSD 2014 4
  5. 5. Modes of Operation: GRID CONNECTED Household appliances and electronics DC Coupled Subsystem PCC Main Utility Grid International Conference on Power Electrical Systems - SSD 2014 5
  6. 6. Tertiary Control Power Import/export from/to the grid. Secondary Control Primary Control f/V Restoration (Island) Synchronization (Island to grid Connected mode) Modeling + Inner loops + droop Control (P/Q Sharing). International Conference on Power Electrical Systems - SSD 2014 6
  7. 7. Problem: Harmonics in Microgrids Possible solutions: - One DG unit could give more harmonics than another. (harmonic current sharing) - Voltage Harmonic Reduction (Control strategies for HC) Problem: Unbalances in Microgrids Possible solutions: - By means of sec. control, PCC voltage unbalances can be compensated by control signals to the primary level. - Voltage Unbalance Compensation (Control strategies) Test and verification that the proposed solutions follow the European power quality standards IEC 61727 and IEC 61000-3-6. International Conference on Power Electrical Systems - SSD 2014 7
  8. 8. Communication model provided by IEC 61850 & IEC 61400-25 to describe the physical devices in the network model. • Study meter-bus technology solutions to integrate smart meters and data concentrators according to EN13757. •Develop different levels of communications architectures for residential AMI following IEC61968-9 (interface standard for meter reading and control). •Integrate smart meters and data concentrators in different levels of wireless and meshed network architectures, according to EN13757-5 (standard for radio mesh meter-bus) and EN13757-4 (wireless meter-bus). Timbus et Al. Management of DER Using Standarized Communications and modern Technologies International Conference on Power Electrical Systems - SSD 2014 8
  9. 9. Household appliances and electronics PCC DC Coupled Subsystem Main Utility Grid Source Protection Network Protection Bidirectional Protection International Conference on Power Electrical Systems - SSD 2014 9
  10. 10.  Microgrid Definition and Operation  Microgrid Research Activities  Microgrid Research Programme and laboratories International Conference on Power Electrical Systems - SSD 2014 10
  11. 11. COORDINATED CONTROL FOR POWER QUALITY IN GRID CONNECTED - ISLANDED MICROGRIDS AC Low voltage coordinated control: MicroGrid AC Microgrids: Bus frequency signaling DC Microgrids: Bus voltage signaling International Conference on Power Electrical Systems - SSD 2014 11
  12. 12. CENTRALIZED AND DECENTRALIZED SECONDARY CONTROL FOR ISLANDED MICROGRIDS Amplitude droop Frequency droop * * mP E* E E * nQ E Pmax P Connection/disconnection load or generation Frequency and voltage deviation Frequency Restoration Voltage Amplitude Restoration E f Secondary response f MG Qmax Q Secondary response E Primary response PDGk Primary response P Pmax Qmax Q QDGk Qmax International Conference on Power Electrical Systems - SSD 2014 12
  13. 13. Communication link Secondary Control Communications Remote sensing Local Control Local Control Local Control … Microgrid International Conference on Power Electrical Systems - SSD 2014 13
  14. 14. TERTIARY CONTROL AND ENERGY MANAGEMENT SYSTEM IN MICROGRIDS International Conference on Power Electrical Systems - SSD 2014 14
  15. 15. TERTIARY CONTROL AND  DC System Optimization ---- Local Generation Control ENERGY MANAGEMENT Objective SYSTEM IN MICROGRIDS • System Overall Efficiency DC/DC CONVERTER Load DC INPUT DC/DC CONVERTER Constraints • Capacity • DC Bus Voltage • System Dynamics Load Rdroop DC COMMON BUS Vr DC COMMON BUS Problem Formulation Typical Efficiency Curve International Conference on Power Electrical Systems - SSD 2014 15
  16. 16. <=2. 5 PQ TERTIARY CONTROL AND ENERGY MANAGEMENT SYSTEM IN MICROGRIDS PQ PQ PQ PQ International Conference on Power Electrical Systems - SSD 2014 16
  17. 17. DISTRIBUTED ACTIVE SYNCHRONIZATION FOR MICROGRID UNDER UNBALANCE AND HARMONIC DISTORTIONS Current/Voltage Source Shut down Gridconnected mode STS = ON Intentional/ Unintentional islanding Sync ISLANDED STS = OFF Voltage Source MODE Stop Black start International Conference on Power Electrical Systems - SSD 2014 17 17
  18. 18. • • • • Remote telecom applications Coupled renewable systems DC powered homes Fast HEV charging stations Configuration Basic control Basic control International Conference on Power Electrical Systems - SSD 2014 18 18
  19. 19. Danish International Conference on Power Electrical Systems - SSD 2014 19 19
  20. 20. 380Vdc Powered Home Phase 1. Phase 2. Phase 3 International Conference on Power Electrical Systems - SSD 2014 20 20
  21. 21. 1. Vdc consumer electronics 380Vdc Powered Home 2. 12/24 Vdc wall sockets 3. 12 Vdc LED lighting 4. 24 Vdc home entertainment system 5. 12 Vdc coffee maker 6. 12 Vdc refrigerator 7. 24 Vdc vacuum cleaner 8. 48 Vdc washing machine 9. 48 Vdc air conditioner 10. 12 Vdc hair dryer 11. 48 Vdc whisper wind turbine 12. PVs connected in 380vdc bus bar 13. 380vdc charger 14. 380vdc busway distribution system 21
  22. 22. 5 Workstations - FC emulators Battery emulators Flywheels Supercaps Dedicated DC/DC converters Constant power loads Real-time monitoring, Control and supervision 1 Setup for Demonstration of DC-home with Real DC appliances. International Conference on Power Electrical Systems - SSD 2014 22 22
  23. 23.  Microgrid Definition and Operation  Microgrid Research Activities  Microgrid Research Programme and laboratories International Conference on Power Electrical Systems - SSD 2014 23
  24. 24. MICROGRID RESEARCH PROGRAMME  Modeling  Control & Operation MicroGrid Research Programme Areas AC MicroGrids DC MicroGrids  Energy Storage  Protection  Power Quality  Standard-based ICT  Networked Control  EMS & Optimization  Multi-Agents International Conference on Power Electrical Systems - SSD 2014 24
  25. 25. MICROGRID RESEARCH T AALBORG MICROGRID RESEARCH TEAM @ EAM Tomislav Dragicevic Josep M. Guerrero Juan C. Vasquez Ernane Coelho MGs modelling Javier Roldan LVRT & PQ DC MGs Fabio Andrade MGs stability Min Chen Power Electronics Yang Han Dan Wu Primary Control Qobad Shafiee Secondary Control Lexuan Meng Tertiary Control Yajuan Guan Ancillary services for MGs Nelson Diaz Energy storage for MicroGrids Chi Zhang LVDC distribution MGs PQ & MV MGs Chendan Li MGs Agents Valerio Mariani Nonlinear Control Hengwei Lin Management and Protection for Microgrids Xin Zhao AC/DC Hybrid MG Bo Sun EV Charging Stations International Conference on Power Electrical Systems - SSD 2014 25
  26. 26. INTELLIGENT MICROGRID LAB - iMGLAB ET Location DEPARTMENT OF ENERGY TECHNOLOGY – ET-AAU International Conference on Power Electrical Systems - SSD 2014 26
  27. 27. Every setup is able to emulate a multi-converter lowvoltage Microgrid, local and energy management control programmed in dSPACE real-time control platforms. International Conference on Power Electrical Systems - SSD 2014 27 27
  28. 28. International Conference on Power Electrical Systems - SSD 2014 28 28
  29. 29. www.microgrids.et.aau.dk Microgrid research and activities International Conference on Power Electrical Systems - SSD 2014 29 29
  30. 30. juq@et.aau.dk joz@et.aau.dk International Conference on Power Electrical Systems - SSD 2014 30 30

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