PID-Type Fuzzy Controller for Grid-Supporting Inverter of Battery in Embedded Small Variable Speed Wind Turbine

Ferdian Ronilaya^1,2*, Hajime Miyauchi¹, Adi Kurniawan³

¹Department of Frontier Technology for Energy and Devices, Kumamoto University, Kumamoto-shi, Japan.
²Department of Electrical Power Engineering, The State Polytechnic of Malang, Malang, Indonesia.
³Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia.

DOI: 10.4236/jpee.2014.24022                

Abstract

Frequency and voltage of embedded variable speed wind turbine (VSWT) driving a permanent magnet synchronous generator (PMSG) is strongly affected by wind speed fluctuations. In practice, power imbalance between supply and demand is also common, especially when VSWT-PMSG is connected to a weak micro grid (MG). If load demand fluctuations become high, isolated MG may be unable to stabilize the frequency and voltage so that battery storage needs to be installed into the MG to adjust energy supply and demand. To allow flexible control of active and reactive power flow from/to battery storage, grid-supporting inverters are used. For a system that contains highly nonlinear components, the use of conventional linear proportional-integral-derivative (PID) controllers may cause system performance deterioration. Additionally, these controllers show slow, oscillating responses, and complex equations are required to obtain optimum responses in other controllers. To cope with these limitations, this paper proposes PID-type fuzzy controller (PIDfc) design to control grid-supporting inverter of battery. To ensure safe battery operating limits, we also propose a new controller scheme called intelligent battery protection (IBP). This IBP is integrated into PIDfc. Several simulation tests are performed to verify the scheme’s effectiveness. The results show that the proposed PIDfc controller exhibits improved performance and acceptable responses, and can be used instead of conventional controllers.

Keywords

Battery; PID-Type Fuzzy Controller; Inverter; Permanent Magnet Synchronous Generator (PMSG); Variable Speed Wind Turbine (VSWT)

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Muyeen, S.M., Takahashi, R., Murata, T. and Tamura, J. (2009) Integration of an Energy Capacitor System with a Variable-Speed Wind Generator. IEEE Transactions on Energy Conversion, 24, 740-749. http://dx.doi.org/10.1109/TEC.2009.2025323
[2]	Barsali, S., Ceraolo, M., Pelacchi, P. and Poli, D. (2002) Control Techniques of Dispersed Generators to Improve the Continuity of Electricity Supply. IEEE Power Engineering Society Winter Meeting, 789-794. http://dx.doi.org/10.1109/PESW.2002.985115
[3]	Chandorkar, M.C., Divan, D.M. and Adapa, R. (1993) Control of Parallel Connected Inverters in Standalone AC Supply Systems. IEEE Transactions on Industry Applications, 29, 136-143. http://dx.doi.org/10.1109/28.195899
[4]	Kawabata, T. and Higashino, S. (1988) Parallel Operation of Voltage Source Inverters. IEEE Transactions on Industry Applications, 24, 281-287. http://dx.doi.org/10.1109/28.2868
[5]	Matthias, H. and Helmut, S. (2002) Control of a Three Phase Inverter Feeding an Unbalanced Load and Operating in Paralel with Other Power Sources. EPE-PEMC, Dubrovnik & Cavtat, 1-10.
[6]	Tuladhar, A., Jin, K., Unger, T. and Mauch, K. (1997) Parallel Operation of Single Phase Inverter Modules with No Control Interconnections. Twelfth Annual APEC, 23-27 Feb 1997, 94-100. http://dx.doi.org/10.1109/APEC.1997.581439
[7]	Chiang, S.J., Yen, C.Y. and Chang, K.T. (2001) A Multimodule Parallelable Series-Connected PWM Voltage Regulator. IEEE Transactions on Industrial Electronics, 48, 506-516. http://dx.doi.org/10.1109/41.925577
[8]	Engler, A. (2000) Control of Parallel Operating Battery Inverters. PV Hybrid Power System.
[9]	Guerrero, J.M., Garcia de Vicuna, L., Matas, J., Castilla, M. and Miret, J. (2004) A Wireless Controller to Enhance Dynamic Performance of Parallel Inverters in Distributed Generation Systems. IEEE Transactions on Power Electronics, 19, 1205-1213. http://dx.doi.org/10.1109/TPEL.2004.833451
[10]	Goya, T., Omine, E., Kinjyo, Y., Senjyu, T., Yona, A., Urasaki, N. and Funabashi, T. (2011) Frequency Control in Isolated Island by Using Parallel Operated Battery Systems Applying H-Inf; Control Theory Based on Droop Characteristics. IET Renewable Power Generation, 5, 160-166. http://dx.doi.org/10.1049/iet-rpg.2010.0083
[11]	Patra, S., Sen, S. and Ray, G. (2007) Design of Robust Load Frequency Controller: H∞ Loop Shaping Approach. Electric Power Components and Systems, 35, 769-783. http://dx.doi.org/10.1080/15325000601175140
[12]	Singh, V.P., Mohanty, S.R., Kishor, N. and Ray, P.K. (2013) Robust H-Infinity Load Frequency Control in Hybrid Distributed Generation System. International Journal of Electrical Power & Energy Systems, 46, 294-305,. http://dx.doi.org/10.1016/j.ijepes.2012.10.015
[13]	Cubillos, X.C.M. and Souza, L.C.G.D. (2009) Using H-Infinity Control Method in Attitude Control System of Rigid Flexible Satellite. Mathematical Problems in Engineering, 2009, 1-9. http://dx.doi.org/10.1155/2009/173145
[14]	Qing-Chang, Z. (2013) Robust Droop Controller for Accurate Proportional Load Sharing among Inverters Operated in Parallel. IEEE Transactions on Industrial Electronics, 60, 1281-1290. http://dx.doi.org/10.1109/TIE.2011.2146221
[15]	Pandey, S.K., Mohanty, S.R. and Kishor, N. (2013) A Literature Survey on Load-Frequency Control for Conventional and Distribution Generation Power Systems. Renewable and Sustainable Energy Reviews, 25, 318-334. http://dx.doi.org/10.1016/j.rser.2013.04.029
[16]	Yesil, E., Güzelkaya, M. and Eksin, I. (2004) Self Tuning Fuzzy PID Type Load and Frequency Controller. Energy Conversion and Management, 45, 377-390. http://dx.doi.org/10.1016/S0196-8904(03)00149-3
[17]	Fortis Wind Energy (2013) Alize Wind Turbine. http://www.fortiswindenergy.com/products/wind turbines/alize
[18]	Matlab/Simpowersystem (2013) Battery-Implement Generic Battery Model. http://www.mathworks.com/help/physmod/powersys/ref/battery.html
[19]	Tremblay, O. and Dessaint, L.A. (2009) Experimental Validation of a Battery Dynamic Model for EV Application. World Electric Vehicle Journal, 3, 1-10.
[20]	Chen, Z. and Spooner, E. (1998) Grid Interface Options for Variable-Speed, Permanent-Magnet Generators. IEE Proceedings: Electric Power Applications, 145, 273-283. http://dx.doi.org/10.1049/ip-epa:19981981
[21]	Wu, Z.Q. and Mizumoto, M. (1996) PID Type Fuzzy Controller and Parameters Adaptive Method. Fuzzy Sets and Systems, 78, 23-35. http://dx.doi.org/10.1016/0165-0114(95)00115-8