DC Link Capacitor Voltage of D-Statcom With Fuzzy Logic Supervision

M. Pavani, I. Venugopal

Abstract


In a DSTATCOM, generally, the dc capacitor voltage is regulated using a PI controller when various control algorithms are used for load compensation. However, during load changes, there is considerable variation in dc capacitor voltage which might affect compensation. In this work, a fuzzy logic based supervisory method is proposed to improve transient performance of the dc link. The fuzzy logic based supervisor varies the proportional and integral gains of the PI controller during the transient period immediately after a load change. An improvement in the performance of the controller is obtained because of appropriate variation of PI gains using expert Knowledge of system behaviour and higher sampling during the transient period. A 50% reduction in the error in dc link capacitor voltage during load change compared to a normal PI-controller is obtained. The voltage waveform also has a faster settling time. The efficacy of the proposed strategy is proved using detailed simulation studies.

References


M.Pavani and Dr.I.Venu gopal “DC Link capacitor voltage of D-STATCOM with Fuzzy logic Supervision”page:1-6,2012.

A. Ghosh and G. Ledwich; “Power Quality enhancement using custom power devices,” Kluwer Academic Publishers, Boston, 2011

N. Hingorani, “Introducing Custom Power ,” IEEE Spectrum. Vol. 32,no. 6 pp. 41-48,2011.

K. Karthikeyan and Mahesh Kumar, “A three phase DSTATCOM compensating AC and DC loads with Fast Dynamic Response,” IEEE Canadian Conf. on Elec. and Comp. Engineering, pp. 1199 – 1202, 2008

A. Ajami and H.S. Hosseini, “Application of a Fuzzy Controller for Transient Stability Enhancement of AC Transmission System by STATCOM,” International Joint Conference SICE-ICASE, pp. 6059-6063, 2006

S. Iyer, A. Ghosh and A. Joshi, “Inverter Topologies for DSTATCOM applications - a simulation study,” Elsevier, Vol. 75 pp. 161 175, 2005

K. H. Ang, G. Chong and Y. Li, “PID control system analysis, design and technology,” IEEE Trans. on Control Systems Technology, Vol. 13, no. 4, 559-576, 2005

H. Kim, F. Blaabjerg, B. B. Jemsen and J. Choi, “Instantaneous power compensation in three-phase systems by using p-q-r theory,” IEEE Trans. on Power Electronics, Vol. 17, no 5, 701-709, 2002.

B. N. Singh, A. Chandra and K. Al-Haddad, “DSP-based indirect current- controlled STATCOM. I. Evaluation of current control techniques,” IEE Proc. on Electric Power Applications, Vol. 147, pp. 107-112, 2000

A. Ghosh and A. Joshi, “A new approach to load balancing and power factor correction in power distribution system,” IEEE Trans. on Power Delivery, Vol. 15, no. 1 pp. 417-422, 2000.

K. M. Passino and S. Yurkovich; “Fuzzy Control” Addison-Wesley, 1998

R. P. Copeland and K. S. Rattan, “A fuzzy logic supervisor for PID control of unknown systems,” Proc. of the 1994 IEEE International Symposium on Intelligent Control, pp. 22-26, 1994.

D. Abramovitch, “Some crisp thoughts on fuzzy logic,” American Control Conference, Vol. 1 pp. 168-172, 1994.

S. Tzafestas and N. P. Papanikolopoulos, “Incremental fuzzy expert PID control,” IEEE Transactions on Industrial Electronics, Vol. 37, pp. 365- 371, 1990.

H. Akagi, Y. Kanazawa, and A. Nabae, “Instantaneous reactive power compensators comprising switching devices without energy storage components,” IEEE Trans. on Ind. Appl. Vol. 20, no. 3, 625-630, 1984.


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