Design of self tuning pi controller for statcom using bats echolocation algorithm(kumaravel g asst proff eee)
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Design of self tuning pi controller for statcom using bats echolocation algorithm(kumaravel g asst proff eee)

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    Design of self tuning pi controller for statcom using bats echolocation algorithm(kumaravel g asst proff eee) Design of self tuning pi controller for statcom using bats echolocation algorithm(kumaravel g asst proff eee) Presentation Transcript

    • Design of Self-Tuning PI Controller for STATCOM using Bats Echolocation Algorithm Presented by: Mr.G.Kumaravel Assistant Professor-EEE Arunai Engineering College Tiruvannamalai Guided by: Dr.C.Kumar,B.E.,M.Sc(Engg).,Ph.D. Director-Academics SKP Engineering College Tiruvannamalai7/16/2011 Six month Review July 2011 1
    • Abstract A Static Synchronous Compensator (STATCOM) is a typical Flexible AC Transmission (FACTS) device, play a vital role in stability of a power system under small and large disturbances. This paper deals with, Design and Evaluation of a Bats Echolocation Algorithm (BEA) for self-tuning PI controller of STATCOM. The proposed BEA shows very good performance in non linear load. The effectiveness of the proposed Bats Echolocation Algorithm is evaluated by computer simulation. Simulations are carried out using MATLAB/SIMULINK software.7/16/2011 Six month Review July 2011 2
    • Power System Configuration with STATCOM7/16/2011 Six month Review July 2011 3
    •  The load impedance is estimated from load voltage and load current. Based on the estimated system load impedance, The Bats Echolocation algorithm optimize the PI controller gains.25/4/2011 Comprehensive Examination 4
    • Principle of STATCOM7/16/2011 Six month Review July 2011 5
    •  Voltage Source Inverter is the core element of the STATCOM , which is in general converts a DC voltage into an AC output voltage at power frequency, with controllable amplitude and phase angle. This paper proposes a self-tuning PI controller ,to maintain the magnitude of the bus voltage by controlling the magnitude and phase shift of the output voltage (Vp) of the VSC. Under steady state, there is no real power transfer occurs via coupling transformer If Vs>Vp,the VSC draws reactive power from the AC bus. Whereas if Vs<Vp , it supplies reactive power to the AC system7/16/2011 Six month Review July 2011 6
    • Fixed – Gain PI Controller for STATCOM7/16/2011 Six month Review July 2011 7
    •  Fixed gain PI controllers are normally used to regulate a load bus voltage under disturbance conditions The d-axis and q-axis current regulators regulate ipd and ipq in order to get desired ipdref and ipqref by adjusting the epd and epq values.Inorder to compute the phase angle α as phase angle difference of Vt and Vs.7/16/2011 Six month Review July 2011 8
    • Bats Echolocation System• Bats emits ultrasonic sound of 5 to 20ms duration at a rate of 10Hz, while looking for prey, by measuring the time of flight, bats estimate their distance from the target.• When the single pulse repetition rate increases up to 200Hz.bats enter the approach phase to prey.• By means of this, bats avoid overlapping of pulses which results in loss of resolution7/16/2011 Six month Review July 2011 9
    • Bats Echolocation Algorithm7/16/2011 Six month Review July 2011 10
    • 7/16/2011 Six month Review July 2011 11
    • 7/16/2011 Six month Review July 2011 12
    • Digital SIMULINK model of system with STATCOM7/16/2011 Six month Review July 2011 13
    • Digital SIMULINK model of VSI with self tuning PI controller using Bats Echolocation Algorithm.7/16/2011 Six month Review July 2011 14
    • Digital Simulink model of Non linear load7/16/2011 Six month Review July 2011 15
    • System parameters Source voltage (Erms(p-p)) =25(kV), source x/r ratio=7, F=50(Hz), Load resistance in the non linear load (Rl) = 3000Ω, filter L=0.1(H),C=250μF, capacitor value on DC side of VSI=1mF7/16/2011 Six month Review July 2011 16
    • Stable Regions of Kp and Ki valuesKP KI Load-20 -10 Light Load-15 -30 15 + j30Ω.-10 -40-15 -10 Medium Load-10 -30 8+ j15Ω. -5 -55-10 -10 Heavy Load -7 -20 3 + j7Ω. -5 -20
    • Digital Simulation Results7/16/2011 Six month Review July 2011 18
    • Dynamic response of system for non linear load with fixed gain PI controller7/16/2011 Six month Review July 2011 19
    • Dynamic response of system for non linear load with self tuning PI controller using BEA7/16/2011 Six month Review July 2011 20
    • Dynamic response of source current for non linear load7/16/2011 Six month Review July 2011 21
    • Dynamic response of DC capacitor voltage for non linear load7/16/2011 Six month Review July 2011 22
    • Response of q-axis current of STATCOM controller7/16/2011 Six month Review July 2011 23
    • Digital Simulation Results In fixed gain PI controller, Kp and Ki values are selected as 0.01 and 0.1 respectively for non linear load with 3kΩ. The dynamic response of system for non linear load with fixed gain PI controller shows the stability in load bus voltage is obtained in 0.017 seconds. The dynamic response of system load bus voltage for non linear load with self tuning PI controller using BEA shows the stability is obtained within 0.0012 seconds.7/16/2011 Six month Review July 2011 24
    • Conclusion The fast dynamic response obtained in system load bus when self tuning PI controller using Bats Echolocation algorithm is used as a STATCOM controller as compared with fixed gain PI controller.7/16/2011 Six month Review July 2011 25
    • References1. Grady, A. Mansoor, E. F. Fuchs, P. Verde, and M. Doyle, “Estimating the net harmonic currents produced by selected distributed single-phase loads: Computers,televisions, and incandescent light dimmers,” in Proc. IEEE Power Eng. Soc. Winter Meeting,Jan. 2002,vol. 2,pp. 1090–1094.2. M. Uzunoglu, C. Kocatepe, R. Yumurtaci, “Voltage Stability Analysis in the Power Systems Including Non-Linear Loads”European Transactions on Electrical Power, Volume 14, Issue 1,Date: January/February 2004, Pages: 41-56.3. N.G.Hingorani and L.Gyugi, Understanding FACTS. New York: IEEE Press, 2000.7/16/2011 Six month Review July 2011 26
    • 4. T.J.E.Miller, Ed., Reactive Power Control in Electric Systems. New York: Wiley, 1982.5. B.S.Chen and Y. Y. Hsu, “An analytical approach to harmonic analysis and controller design of a STATCOM,” IEEE Trans. Power Del., vol. 22,no. 1, pp. 423–432, Jan. 2007.6. JI-CHANG LE and YA-HU KUO, Decoupled fuzzy sliding- mode control, IEEE Trans. On Fuzzy Systems, Vol. 6, 1998.7. Hung-Chi Tsai; Chia-Chi Chu; "Nonlinear STATCOM Controller using Passivity-Based Sliding Mode Control" IEEE APCCAS, 4-7 Dec. 2006 Page(s):1996 – 1999.7/16/2011 Six month Review July 2011 27
    • 8. Yazdani, A.; Crow, M.L.; Guo, J.; "A comparison of linear and nonlinear STATCOM control for power quality enhancement" IEEE Power and Energy Society General Meeting - onversion and Delivery of Electrical Energy in the 21st Century, 20-24 July 2008 Page(s):1 –6.9. Allen, G. M. (1940), Bats, Harvard University Press.10. Griffin, D. R. (1944), „Echolocation in blind men, bats and radar‟, Science 100, 589–590.11. Souvik Chattopadhyay and V. Ramanarayanan, “A Voltage Sensorless Current Shaping Method for Balancing the Input Current of the Three Phase Three Wire Boost Rectifier Under Unbalanced Input Voltage Condition,” accepted for publication in IEEE Power Electronics Specialists Conference ‟02, 23-27 June, 2002, Cairns, Australia.7/16/2011 Six month Review July 2011 28
    • 7/16/2011 Six month Review July 2011 29