Performance Analysis of Grid Connected PV/Wind Hybrid Power System during Variations of Environmental Conditions and Load

ABSTRACT:

This paper investigates a dynamic modeling, simulation and control of Photovoltaic (PV)-wind hybrid system connected to electrical grid and feeds large plant with critical variable loads. The technique of extracting maximum power point is applied for the hybrid power system to capture maximum power under varying climatic conditions. Moreover, Control strategy for power flow is proposed to supply critical load demand of plant. Modeling and simulation of the proposed hybrid system is performed using matlab-Simulink software. The Dynamic performance of the proposed hybrid system is analyzed under different environmental conditions. The simulation results have proven the effectiveness of the proposed maximum power point tracking (MPPT) strategies in response to rapid variations of weather conditions during the day. Moreover, the results show that when the injected power from hybrid system is larger than critical load power, the excess power will be injected to electrical grid. Otherwise, when injected power is lower than critical power demand, electrical utility grid in cooperated with hybrid power system will supply the critical load power. Moreover, when the injected power from hybrid system is unavailable, load demand is entirely fed by electrical utility.

KEYWORDS:

  1. PV
  2. Wind
  3. Hybrid system
  4. MPPT control
  5. DFIG
  6. Load

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1. Hybrid power system model.

EXPECTED SIMULATION RESULTS:

(a) Solar irradiance.

(b) Injected active power and reactive power.

(c) Injected current from PV station side (A).

(d) Grid voltage and injected current.

Fig. 2. Performance of PV station (A).

(a) Solar irradiance.

(b) Injected active power and reactive power.

(c) Injected current from PV station side (B).

(d) Power factor of DC/AC converter.

Fig. 3. Performance of PV station (B).

(a) Wind speed profile.

(b) Injected active power and reactive power.

(c) Injected current from Wind farm side (C).

(d) DC link voltage.

Fig. 4. Performance of wind farm

(a) Power delivered to grid side (PCC-bus).

(b) Voltage of PCC-bus.

Fig. 5. Performance of PV-wind hybrid system at PCC-bus.

(a) power flow between hybrid system, grid and load.

(b) Load current side (D).

(c) Load voltage bus-B1.

Fig. 6. Injected power from hybrid system greater than load demand for case 1.

(a) Real power flow between hybrid system, grid and load.

(b) Load current side (D).

Fig. 7. Injected power from hybrid system lower than load demand for case 2.

Fig. 8. Real power flow between hybrid system, grid and load when hybrid power is unavailable.

CONCLUSION:

In this paper, modeling, simulation and control of grid connected photovoltaic-wind hybrid power system have been successfully investigated. The proposed hybrid system consists of two Photovoltaic (PV) stations placed at different locations and one wind farm are integrated into main AC bus and supply large plant with critical variable loads. The incremental conductance MPPT technique is applied for both PV stations to extract maximum power under variations of solar irradiance. Also, an improved MPPT control strategy based on measurement of mechanical power is applied for wind farm to capture the maximum power under changes of wind speed. Moreover, control strategy for power flow is proposed to supply critical load demand of plant. The Dynamic performance of the proposed hybrid system is tested under different environmental conditions such as changes of solar irradiance and wind speed. In addition, the validation of the proposed power flow is evaluated under variation of the critical load demand. The simulation results have proven the robustness of the MPPT control strategies in response to rapid variations in weather conditions during the day. Moreover, the power flow control strategy successfully meets the critical load demand of the plant.

REFERENCES:

[1] R. Benadli and A. Sellami, “Sliding mode control of a photovoltaic-wind hybrid system,” in Electrical Sciences and Technologies in Maghreb (CISTEM), 2014 International Conference on, 2014, pp. 1-8.

[2] J. Hossain, N. Sakib, E. Hossain, and R. Bayindir, “Modelling and Simulation of Solar Plant and Storage System: A Step to Microgrid Technology,” International Journal of Renewable Energy Research (IJRER), vol. 7, pp. 723-737, 2017.

[3] U. Choi, K. Lee, and F. Blaabjerg, “Power electronics for renewable energy systems: Wind turbine and photovoltaic systems,” in Renewable Energy Research and Applications (ICRERA), 2012 International Conference on, 2012, pp. 1-8.

[4] A. B. Oskouei, M. R. Banaei, and M. Sabahi, “Hybrid PV/wind system with quinary asymmetric inverter without increasing DC-link number,” Ain Shams Engineering Journal, vol. 7, pp. 579-592, 2016.

[5] H. Laabidi and A. Mami, “Grid connected Wind- Photovoltaic hybrid system,” in Energy (IYCE), 2015 5th International Youth Conference on, 2015, pp. 1-8.

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