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Microgrid management using hybrid inverter fuzzy-based control

  • Mustapha Habib
  • Ahmed Amine Ladjici
  • Abdelghani HarragEmail author
Original Article
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Abstract

Microgrid systems are becoming a very promising solution to meet the power demand growth especially in remote areas where diesel generators (DG) are commonly used as a main energy source. Photovoltaic (PV) systems are commonly used as a sustainable energy source to economize DG fuel. Due to the intermittent and fluctuating behavior of PV generators, energy storage systems (ESS) such as electrochemical battery are suggested. PV and ESS are usually connected using one inverter/charger called hybrid inverter. The power management is crucial to optimize the fuel consumption and operate efficiently ESS. Additionally, in an off-grid operation, the microgrid frequency becomes sensible due to the slow dynamic of DG which requires an additional control tool to improve the frequency regulation. This paper proposes a new power management based on Mamdani fuzzy logic. The proposed controller considers the targets mentioned above by only controlling the hybrid inverter. Simulation results prove that fuzzy-based controller reduces the DG fuel consumption by more than 12% compared to classical hysteresis management control. Moreover, the proposed controller performs efficiently regarding the conventional frequency regulation, which is widely used in microgrid control.

Keywords

Diesel generator DG Photovoltaic PV Electrochemical battery Power management Mamdani fuzzy logic 

List of symbols

Iph

Photocurrent

I

Diode saturation current

q

Coulomb constant (1.602 × 10−19 C)

K

Boltzmann’s constant (1.38 × 10−23 J/K)

T

Cell temperature

PN

P–N junction ideality factor

Rs

Intrinsic series resistance

Rsh

Intrinsic parallel resistance

S

Real solar radiation

Sref

Solar radiation in standard test conditions (1000 w/m2)

Tref

Cell absolute temperature in standard test conditions

Iph-ref

Photocurrent in standard test conditions

CT

Temperature coefficient

Is-ref

Diode saturation current in standard test conditions

Eg

Band-gap energy of the cell semiconductor

E

Battery no-load voltage

Eo

Battery constant voltage

k

Polarization voltage

Q

Battery capacity

A

Exponential zone amplitude

B

Exponential zone time constant inverse

Efull

Fully charged voltage

Eexp

Voltage at the end of exponential zone

Qexp

Charge at the end of exponential zone

Enom

Voltage at the end of nominal zone

Qnom

Charge at the end of nominal zone

Fmin

Minimum allowed frequency value

Fr

Regulation frequency value

Fmax

Maximum allowed frequency value

Tsm

Governor time constant

Td

Engine time constant

R

Frequency drop

Vf

Excitation voltage of the synchronous machine

Abbreviations

MPPT

Maximum power point tracking

P&O

Perturb and observe

PV

Photovoltaic

SOC

State of charge

ESS

Energy storage system

PM

Power management

MG

Microgrid

FL

Fuzzy logic

DC

Direct current

AC

Alternative current

DG

Diesel generator

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Mustapha Habib
    • 1
  • Ahmed Amine Ladjici
    • 1
  • Abdelghani Harrag
    • 2
    • 3
    Email author
  1. 1.Departement of Electrical EngineeringUSTHBAlgiersAlgeria
  2. 2.Optics and Precision Mechanics InstituteFerhat Abbas UniversitySetifAlgeria
  3. 3.CCNS Laboratory, Electronics Department, Faculty of TechnologyFerhat Abbas UniversitySetifAlgeria

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