ABSTRACT:
In
this paper, a topology using a Dual-stator Winding Induction Generator (DWIG)
and a boost converter is proposed for the variable speed wind power
application. At low rotor speeds, the generator saturation limits the voltage
of the DWIG. Using a boost converter, higher DC voltage can be produced while
the DWIG operates at Maximum Power Point Tracking (MPPT) even at low speed and
low voltage conditions. Semiconductor Excitation Controller (SEC) of the DWIG
utilizes Control-Winding Voltage Oriented Control (CWVOC) method to adjust the
voltage, considering V/f characteristics. For the proposed topology, the
SEC capacity and the excitation capacitor is optimized by analyzing the SEC
reactive current considering wind turbine power-speed curve, V/f strategy,
and the generator parameters. The method shows that the per-unit capacity of
the SEC can be limited to the inverse of DWIG magnetizing reactance per-unit
value. The topology is simulated in MATLAB/Simulink platform and experimented
with a scaled 1 kW prototype. Both simulation and experimental results
demonstrate wide variable speed operation range of the DWIG and verify the
optimization.
KEYWORDS:
1. Boost converter
2. Control-winding voltage oriented control
3. Dual-stator winding induction generator (DWIG)
4. Wind power
5. Variable speed operation.
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
This
paper proposes a topology for variable speed wind power application using dual
stator-winding induction generator. A boost converter is utilized for MPPT and
wide range variable speed operation, especially at low-speed condition is
obtained. At low speeds, DWIG voltage is dropped due to V/f strategy and
a boost converter is used to increase the voltage level to meet the higher and
constant voltage requirement, such as in voltage source converter DC-link or
offshore DC network applications. In the proposed topology, by choosing the
optimum excitation capacitor, the capacity of the semiconductor excitation
controller is minimized. Finally, to verify the proper operation of the
proposed system, simulation and experimental results are presented which validate
the wide-speed range operation of the system and the excitation capacitor
optimization method.
REFERENCES:
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[3] Z. Chen, J. M. Guerrero, and F. Blaabjerg, "A Review of the State of the Art of Power Electronics for Wind Turbines," IEEE Transactions on Power Electronics, vol. 24, no. 8, pp. 1859-1875, Aug. 2009.
[4] V. Yaramasu, B. Wu, P. C. Sen, S. Kouro and M. Narimani, "High-power wind energy conversion systems: State-of-the-art and emerging technologies," Proceedings of the IEEE, vol. 103, no. 5, pp. 740-788, May 2015.
[5] H. Nian and Y. Song, "Direct Power Control of Doubly Fed Induction Generator Under Distorted Grid Voltage," IEEE Transactions on Power Electronics, vol. 29, no. 2, pp. 894-905, Feb. 2014.
