RESEARCH CHALLENGES MICROGRID …vbn.aau.dk/files/186895621/SSD_final_webpage.pdf · IN MICROGRID TECHNOLOGIES ... power quality standards IEC 61727 and IEC 61000-3-6. 8 Timbus et

RESEARCH CHALLENGES IN MICROGRID TECHNOLOGIES

PostDoc - DFF Juan C. Vasquez [email protected] Professor Josep M. Guerrero [email protected]

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Microgrid Definition and Operation

Microgrid Research Programme in AAU

Microgrid Research activities and laboratories

International Conference on Power Electrical Systems - SSD 2014

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What is a Microgrid?

Main

Utility Grid

PCC

Household appliances and electronics

DC Coupled Subsystem


Hybrid AC/DC Microgrids

Main

Utility Grid

PCC



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Modes of Operation: ISLANDED


Main

Utility Grid

PCC



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Modes of Operation: GRID CONNECTED


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Primary Control

Tertiary Control

Secondary Control

Modeling + Inner loops + droop Control (P/Q Sharing).


Power Import/export from/to the grid.

f/V Restoration (Island) Synchronization (Island to grid Connected mode)

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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.

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Timbus et Al. Management of DER Using Standarized Communications and modern Technologies

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).

9 International Conference on Power Electrical Systems - SSD 2014

Main

Utility Grid

PCC



Source Protection Network Protection Bidirectional Protection

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Microgrid Research Activities

Microgrid Research Programme and laboratories


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COORDINATED CONTROL FOR POWER QUALITY IN GRID CONNECTED - ISLANDED MICROGRIDS

AC Low voltage MicroGrid coordinated control:

AC Microgrids:

Bus frequency signaling

DC Microgrids:

Bus voltage signaling


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CENTRALIZED AND DECENTRALIZED SECONDARY CONTROL FOR ISLANDED MICROGRIDS

mP **

P

Pmax

Frequency droop

*E E nQ E*

Q

E

Qmax

Amplitude droop

E

Q

maxQ

E

maxQ

Primary

response

Secondary

response

kDGQ

Voltage Amplitude

Restoration f

P

kDGP maxP

MGf

Primary

response

Secondary

response

Frequency Restoration

Connection/disconnection load or generation Frequency and voltage deviation


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Local

Control

…

Local

Control Local

Control

Microgrid

Remote sensing

Secondary Control

Communications

Communication link


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TERTIARY CONTROL AND ENERGY MANAGEMENT SYSTEM IN MICROGRIDS



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Load

Load

DC

COMMON BUS

DC

COMMON BUS

DC/DC

CONVERTER

DC/DC

CONVERTER

DC INPUT

Rdroop

Vr

DC System Optimization ---- Local Generation Control

Typical Efficiency Curve Problem Formulation

Constraints

• Capacity

• DC Bus Voltage

• System Dynamics

Objective

• System Overall Efficiency


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PQ PQ

PQ PQ PQ

<=2.5


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DISTRIBUTED ACTIVE SYNCHRONIZATION FOR MICROGRID UNDER UNBALANCE AND HARMONIC DISTORTIONS

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ISLANDED MODE

Grid-connected

mode

Shut down

Black start

STS = ON

STS = OFF

Current/Voltage

Source

Sync

Voltage Source

Stop

Intentional/

Unintentional

islanding


• Remote telecom applications • Coupled renewable systems • DC powered homes • Fast HEV charging stations

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Basic control Basic control

Configuration


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Danish


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Phase 1. Phase 2. Phase 3


380Vdc Powered Home

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380Vdc Powered Home

1. Vdc consumer electronics 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

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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.



Microgrid Research Activities

Microgrid Research Programme and laboratories

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MicroGrid Research Programme Areas

AC MicroGrids DC MicroGrids

Modeling

Control & Operation

Energy Storage

Protection

Power Quality

Standard-based ICT

Networked Control

EMS & Optimization

Multi-Agents

MICROGRID RESEARCH PROGRAMME


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MICROGRID RESEARCH TEAM MICROGRID RESEARCH TEAM @ AALBORG


Josep M. Guerrero

Tomislav Dragicevic DC MGs

Fabio Andrade MGs stability

Qobad Shafiee Secondary Control

Lexuan Meng Tertiary Control

Dan Wu Primary Control

Chendan Li MGs Agents

Yajuan Guan Ancillary services for MGs

Nelson Diaz Energy storage for MicroGrids

Chi Zhang LVDC distribution MGs

Hengwei Lin Management and Protection for Microgrids

Xin Zhao AC/DC Hybrid MG

Bo Sun EV Charging Stations

Javier Roldan LVRT & PQ

Valerio Mariani Nonlinear Control

Ernane Coelho MGs modelling

Juan C. Vasquez

Min Chen Power Electronics

Yang Han PQ & MV MGs

INTELLIGENT MICROGRID LAB - iMGLAB

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ET Location

DEPARTMENT OF ENERGY TECHNOLOGY – ET-AAU


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Every setup is able to emulate a multi-converter low-voltage Microgrid, local and energy management control programmed in dSPACE real-time control platforms.


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www.microgrids.et.aau.dk

Microgrid research and activities



[email protected]

[email protected]

Documents

RESEARCH CHALLENGES MICROGRID …vbn.aau.dk/files/186895621/SSD_final_webpage.pdf · IN MICROGRID TECHNOLOGIES ... power quality standards IEC 61727 and IEC 61000-3-6. 8 Timbus et