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Experimental Investigation on a New Hybrid System Employing Wind-Driven DFIG and Solar PV Panels

  • Sekhar Nindra
  • Lakshmana Rao Paila
  • Kumaresan NatarajanEmail author
  • Selvan Manickavasagam Parvathy
Original Contribution
  • 21 Downloads

Abstract

This paper investigates the operation of wind-driven doubly fed induction generator (DFIG) with solar photovoltaic (PV) system for supplying isolated loads. A simple control strategy has been developed to maintain a set voltage and frequency at the DFIG stator terminals which is envisaged as a virtual grid for supplying loads. This is achieved by effective closed-loop control of a PV-fed sinusoidal pulse width modulation (SPWM) inverter connected at the rotor terminals of DFIG. The DC link of the SPWM inverter is made as a stiff one by connecting a battery bank, which acts as an energy storage device as well as a contingency source when output of PV array is less. A boost converter is interfaced between solar PV panels and battery to enable maximum power extraction from PV panels. A single sensor-based maximum power point tracking (MPPT) algorithm has been developed for solar PV system. The MPPT algorithm monitors only the output current of the boost converter, as the output voltage of boost converter is held at a constant value by the battery bank. In order to demonstrate the successful working of the proposed hybrid system, a prototype has been fabricated in the laboratory and tested under different operating conditions.

Keywords

Doubly fed induction generator (DFIG) Solar PV system Hybrid system Maximum power point tracking (MPPT) Renewable energy electric conversion system Power converters 

List of Symbols

fs

Frequency at the stator terminals of DFIG, Hz

fr

Frequency at the rotor terminals of DFIG, Hz

IB

Battery current, A

IPV

PV array current, A

I0

Boost converter output current, A

IS

DFIG stator current, A

Iinv

DC input current of the SPWM inverter, A

m

Modulation index of SPWM inverter

N

DFIG rotor speed, rpm

P

Number of poles

P0

Boost converter output power, W

PPV

PV array output power, W

VB

Battery terminal voltage, V

VS

DFIG stator line voltage, V

VPV

PV array terminal voltage, V

V0

Boost converter output voltage, V

δ

Duty ratio of boost converter

Notes

Acknowledgements

The authors gratefully acknowledge the authorities of the National Institute of Technology, Tiruchirappalli, India, for all the facilities provided for carrying out the experimental work in the preparation of this paper. Further, this work was supported in part by the National Institute of Wind Energy (Formerly Centre for Wind Energy Technology), Chennai, India, an autonomous Research and Development Institution under the Ministry of New and Renewable Energy, Govt. of India.

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Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.Department of Electrical and Electronics EngineeringNational Institute of Technology, TiruchirappalliTiruchirappalliIndia

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