ABSTRACT:
This paper
analyzes the operation of small wind turbine system with variable speed
Permanent Magnet Synchronous Generator (PMSG) and a Lead Acid Battery (LAB) for
residential applications, during wind speed variation. The main purpose is to
supply 230 V/50 Hz domestic appliances through a single-phase inverter. The required
power for the connected loads can be effectively delivered and supplied by the
proposed wind turbine and energy storage systems with an appropriate control
method. The models of the PMSG, boost converter with a control method for
obtaining maximum power characteristic of wind turbine (MPPT), voltage source
inverter (VSI) and LAB model with battery state of charge (SOC) control method,
are presented. Energy storage devices are required for power balance and power
quality in stand alone wind energy systems. Simulations and experimental
results validate the stability of the supply.
KEYWORDS:
1. Wind energy
2. Variable-speed
3. Permanent magnets generators and energy storage
SOFTWARE: MATLAB/SIMULINK
Fig.
1. Stand-alone wind system configuration.
Fig.
2. The PMSG rotor speed variation:
(a)
Simulation results; (b) Experimental results.
Fig.
3. The PMSG electromagnetic torque:
(a)
Simulation results; (b) Experimental results.
Fig.
4. The DC link rectifier bridge voltage variation:
(a) Simulation
results; (b) Experimental results.
Fig.
5. The converter input current variation:
(a)
Simulation results; (b) Experimental results.
Fig.
6. The LAB voltage variation:
(a)
Simulation results; (b) Experimental results.
Fig.
7. The LAB current variation:
(a)
Simulation results; (b) Experimental results.
Fig.
8. The LAB state of charge (SOC) variation:
(a)
Simulation results; (b) Experimental results.
Fig.
9. The active power balance of the system:
(a)
Simulation results; (b) Experimental results.
CONCLUSION:
In this paper, a PMSG wind turbine
system for residential applications is analyzed. Simulation and experimental
results show that the active power balance of the system proves to be satisfying
during variable wind speed condition. The MPPT algorithm will ensure a maximum extraction
of energy from the available wind. LAB always ensures the safe supply of the
loads (households) regardless of the problems caused by wind speed variations. At
the end one can conclude that the power system’s stability considered in terms
of load power quality can be ensured by using the proposed configuration.
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