This paper presents a modeling and control strategies of a grid connected Wind-Photovoltaic hybrid system. This proposed system consists of two renewable energy sources in order to increase the system efficiency. The Maximum Power Point Tracking (MPPT) algorithm is applied to the PV system and the wind system to obtain the maximum power for any given external weather conditions. The generator side converter is controlled by the Field Oriented Control (FOC). This approach is used to control independently the flux and the torque by applying the d- and q-components of the current motor. The utility grid side converter is controlled by the Voltage Oriented Control (VOC) strategy which is adopted to adjust the DC-link at the desired voltage. The simulation results using PSIM software environment prove the good performance of these used techniques to generate sinusoidal current waveforms. This current is synchronized with the grid voltage. Moreover, the DC bus voltage is perfectly constant because only the active power is injected into the grid. Simulations are carried out to validate the effectiveness of the proposed system methods.
- hybrid system
- MPPT control
- photovoltaic system
- Wind turbine
Fig. l.The proposed PV -wind hybrid system
EXPECTED SIMULATION RESULTS
Fig. 2 Solar irradiance changes
Fig. 3 The variation of PY arrays current
Fig. 4 The PY arrays voltage
Fig. 5 The PY arrays power and reference
Fig. 6 Duty cycle
Fig. 7 Wind speed profile
Fig. 8 Electrical angular speed of the SCIG and its reference
Fig. 9 The active power injected into the grid
Fig. 10 The Reactive power injected into the grid
Fig. 11 The waveforms of the current
Fig. 12 The three phase current and voltage waveforms
Fig. 13. DC link voltage.
In this paper, Wind-Photo voltaic hybrid system control has been investigated. An MPPT method has been studied. It has been simulated with different solar irradiation and wind speed environments in order to maximize the output power of the proposed system . Two control techniques have been employed to improve the hybrid system usefulness . The controlled rectifier connected to the squirrel-cage induction generator (SCIG) has been controlled by the Field Oriented Control (FOC) to reach the optimal rotational speed, The grid-side inverter has been controlled by the Voltage Oriented Control (VOC) method to keep the dc-link voltage at the desired value. The hybrid system simulation has been implemented in PSIM software and its performances were proved when the solar irradiance change or the wind speed occurs.
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