overview of microgrids

Incheon National UniversityNguyen Van Vinh

Report No. 10

Overview of Microgrids

The Basic Concept of Microgrid

Definition and Classification of Microgrid

Advantage and Challenges of Microgrid

Microgrid Control

Purpose of Control

Grid-Connected Mode

Islanded Mode

Design control scheme for Grid-Connected and Islanded

operation modes

Contents

What is a Microgrid ?

Distributed generationLoadsEnergy storage systems

Microgrid central control

Point of common coupling

Mahmoud, M. S., S. Azher Hussain, and M. A. Abido. "Modeling and control of microgrid: An overview." Journal of the Franklin Institute 351.5 (2014): 2822-2859.

Classification of Microgrid

Justo, Jackson John, et al. "AC-microgrids versus DC-microgrids with distributed energy resources: A review." Renewable and Sustainable Energy Reviews 24 (2013): 387-405.Liu, Xiong, Peng Wang, and Poh Chiang Loh. "A hybrid AC/DC micro-grid."IPEC, 2010 Conference Proceedings. IEEE, 2010.

Microgrid of advantage

Ability to separate from main grid during disturbance

Reduce the emission

Reduce electricity cost

Microgrid challenges

Maintenance and space required for battery bank

Synchronization with main grid

Uncertainty of wind and PV power

Protection of microgrid

Advantage and Challenges of Microgrid

Hartono, B. S., Y. Budiyanto, and R. Setiabudy. "Review of microgrid technology." QiR (Quality in Research), 2013 International Conference on. IEEE, 2013.

Grid-connected mode

Real and reactive power control

• Smoothing wind power

• Power at point of common

coupling (PCC)

Island mode

Isolated from main grid

Frequency and Voltage control

Microgrid Operation Model

Nikos Hatziargyriou. "Microgrids: Architectures and Control.“ ISBN: 978-1-118-72064-6, 344 pages, December 2013, Wiley-IEEE Press.

Grid-Connected Model

Delghavi, Mohammad Bagher. "Advanced Islanded-Mode Control of Microgrids." (2011).

Islanded Model

Delghavi, Mohammad Bagher. "Advanced Islanded-Mode Control of Microgrids." (2011).

Basic Model in Microgrid

GridAC source [380 0 60]

MG

Point of common coupling

Scope

Wind Generator[380 0 60]

[P=130kW QL=0 VAR]

BESS[800Vdc 60(Hz)]

[P=50 kW QL=0 VAR]

Diesel[P= 200 kW Q= 30 kVAR]

RL Load[380(V) 60(Hz)]

[P=350kW Q=30kVAR]

Inner in BESS Block

PWM

Outer control Inner control

Simulation Results