Modeling, Implementation and Performance Analysis of a Grid-Connected Photovoltaic/Wind Hybrid Power System

 Abstract

Modeling, Implementation and Performance Analysis of a Grid-Connected Photovoltaic/Wind Hybrid Power System Wind Hybrid System Grid-Connected PV Modeling & Analysis focuses on the dynamic modeling, design, and control strategy of a grid-connected photovoltaic (PV)/wind hybrid power system. By integrating PV stations and wind farms through a main AC-bus, the system's performance is improved. The Maximum Power Point Tracking (MPPT) technique is utilized for both PV and wind power sources to maximize the power extracted from the hybrid system, even in changing environmental conditions.

In this paragraph Using Matlab/Simulink software, the hybrid power system is modeled and simulated, and the effectiveness of the MPPT technique and control strategy is evaluated. Simulation results demonstrate the effectiveness of the MPPT technique in maximizing power extraction, and show that the hybrid power system operates at unity power factor and maintains constant grid voltage regardless of environmental conditions and injected power.

Keywords

PV; wind; hybrid system; wind turbine; DFIG; MPPT control.

Block Diagram:

Fig. 1. The system configuration of PV/wind hybrid power system.

Expected Simulation Results:

(a) Solar Irradiance.

(b) PV array voltage.

(c) PV array current.

(d) A derivative of power with respect to voltage (dPpv/dVpv).

                            Fig. 2. Performance of PV array during the variation of solar irradiance.

(a) PV DC-link Voltage.

(b) d-q axis components of injected current from PV station.

(c) Injected active and reactive power from PV station.

(d) Grid voltage and injected current from PV station.

(e) The power factor of the inverter.

(f) Injected current from PV station.

                                   Fig. 3. Performance of PV station during variation of the solar irradiance.

CONCLUSION

In this paper, a detailed dynamic modeling, design and control strategy of a grid-connected PV/wind hybrid power system has been successfully investigated. The hybrid power system consists of PV station of 1MW rating and a wind farm of 9 MW rating that are integrated through main AC-bus to inject the generated power and enhance the system performance. The incremental conductance MPPT technique is applied for the PV station to extract the maximum power during variation of the solar irradiance. On the other hand, modified MPPT technique based on mechanical power measurement is implemented to capture the maximum power from wind farm during variation of the wind speed. The effectiveness of the MPPT techniques and control strategy for the hybrid power system is evaluated during different environmental conditions such as the variations of solar irradiance and wind speed. The simulation results have proven the validity of the MPPT techniques in extraction the maximum power from hybrid power system during variation of the environmental conditions. Moreover, the hybrid power system successfully operates at unity power factor since the injected reactive power from hybrid power system is equal to zero. Furthermore, the control strategy successfully maintains the grid voltage constant regardless of the variations of environmental conditions and the injected power from the hybrid power system.

REFERENCES

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