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.
- Wind energy
- Permanent magnets generators and energy storage
Fig. 1. Stand-alone wind system configuration.
EXPECTED SIMULATION RESULTS:
Fig. 2. The PMSG rotor speed variation: (a) Simulation results
Fig. 3. The PMSG electromagnetic torque: (a) Simulation results
Fig. 4. The DC link rectifier bridge voltage variation: (a) Simulation results
Fig. 5. The converter input current variation: (a) Simulation results
Fig. 6. The LAB voltage variation: (a) Simulation results
Fig. 7. The LAB current variation: (a) Simulation results
Fig. 8. The LAB state of charge (SOC) variation: (a) Simulation results
Fig. 9. The active power balance of the system: (a) Simulation results
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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