Control Scheme for a Stand-Alone Wind Energy Conversion System

ABSTRACT

Present energy need densely commit on the normal sources. But the limited show and steady growth in the price of normal sources has move the focus toward continuous sources of energy. Of the possible other sources of energy, wind energy is studied to be one of the show technologies.

WECS

With a competing cost for service creation, wind energy conversion system (WECS) is nowadays extend formeeting both grid-connected and stand-alone load order. However, wind flow by nature is regular. In order to secure continuous supply of power suitable storage technology is used as backup. In this paper, the sustainability of a 4-kW hybrid of wind and battery system is examine for meeting the want of a 3-kW stand-alone dc load describing a base telecom station.

MPPT

A charge monitor for battery bank based on turbine maximum power point tracking and battery state of charge is advanced to ensure controlled charging and discharging of battery. The automatic safety of the WECS is sure by means of point control technique. Both the control program are joined and the efficacy is validated by testing it with various load and wind profiles in MATLAB/SIMULNIK.

 KEYWORDS

  1. Maximum power point tracking (MPPT)
  2. Pitch control
  3. State of charge (SoC)
  4. Wind energy conversion system (WECS).

SOFTWARE: Matlab/Simulink

BLOCK DIAGRAM:

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Fig. 1. Layout of hybrid wind–battery system for a stand-alone dc load.

SIMULATION RESULTS:

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Fig. 2. (a) WT and (b) battery parameters under the influence of gradual variation of wind speed.

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Fig. 3. (a)WT and (b) battery parameters under the influence of step variation of wind speed.

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Fig. 4. (a) WT and (b) battery parameters under the influence of arbitrary variation of wind speed.

CONCLUSION

The power possible from a WECS is very dishonest in nature. So, a WECS cannot ensure continuing power flow to the load. In order to meet the load need at all case, suited storage device is wanted. Therefore, in this paper, a hybrid wind-battery system is chosen to supply the desired load power. To reduce the chance quality of wind flow the WECS is integrate with the load by suitable monitor.

WT

The control logic realize in the hybrid set up includes the charge control of battery bank using MPPT and pitch control of the WT for satisfy automatic and mechanical safety. The charge controller tracks the maximum power available to charge the battery bank in a reserved manner. Further it also makes sure that the batteries discharge current is also within the C/10 limit.

BUCK  CONVERTER

The current set up control technique normally secure the buck converter from over current situation. However, at times due to MPPT control the source power may be more as compared to the battery and load demand. During the power mismatch conditions, the pitch action can regulate the pitch angle to reduce the WT output power in agreement with the total demand.

MATLAB

Besides controlling the WT quality, the pitch control logic word that the rectifier voltage does not lead to an over voltage situation. The hybrid wind-battery system along with its control logic is developed in MATLAB/SIMULINK and is tested with various wind profiles. The outcome of the simulation test confirm the enhanced work of the system.

 REFERENCES

  • [1] Sahin, “Progress and recent trends in wind energy,” Progress in Energy Combustion Sci., vol. 30, no. 5, pp. 501–543, 2004.
  • [2] D. Richardson and G. M. Mcnerney, “Wind energy systems,” Proc. IEEE, vol. 81, no. 3, pp. 378–389, Mar. 1993.
  • [3] Saidur, M. R. Islam, N. A. Rahim, and K. H. Solangi, “A review on global wind energy policy,” Renewable Sustainable Energy Rev., vol. 14, no. 7, pp. 1744–1762, Sep. 2010.

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