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Control Scheme and Implement of a Unified Power Flow Controller ABSTRACT: This paper describes the theory, the modeling technique, control scheme of Unified Power Flow Controller. Based on park transformation, it designs decoupled control scheme of UPFC shunt branch and cross-coupling control scheme of UPFC series branch in d and q-axis which eliminates the dynamic interaction between active and reactive power flow through the line. The control system of UPFC series branch consists of outer power loop, middle voltage loop and inner current loop. The response of the inner current loop is much faster than response of the outer voltage loop, which ensures that input current follows input voltage and improves dynamic performance of UPFC. As a step closer to practical application of UPFC, the paper analyzes individually the functions of STATCOM and SSSC. Experimental results verify the viability and effectiveness of applying the proposed control scheme in UPFC.
KEYWORDS: 1. Unified Power Flow Controller 2. Decoupled control scheme 3. Mathematical model 4. Series converter 5.
Shunt Converter
6.
Cross-Coupling
SOFTWARE: MATLAB/SIMULINK
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BLOCK DIAGRAM:
Fig. 1 Experimental system configuration of a general UPFC
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EXPECTED SIMULATION RESULTS:
Fig.2 Performance of DC-link capacitor charging in UPFC
Fig.3 Performance of UPFC to emulate reactance
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Fig.4 Performance of UPFC to step change in the line real power reference from zero to ±3KW and back
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Fig.5 Performance of UPFC to step change in the line real power reference from zero to -3KW and hack
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Fig. 6 Performance of UPFC to step change in the line reactive power reference from zero to +lKvar and back
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Fig.7 Performance of UPFC to step change in the line reactive power reference from zero to -3Kvar and back
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0-9347143789/9949240245 CONCLUSION: The paper proposes an advanced control scheme of UPFC and analyzes dynamic performance of a UPFC in detail. By implementing a synchronously rotating d-q frame, a dynamic model and control system for UPFC has been derived. With the double loop decoupled control approach of UPFC shunt branch, it can regulate the UPFC bus voltage effectively and maintain the DC voltage constant. Applying the triple loop cross-coupling control for UPFC series branch, it can reduce the interaction effects between real and reactive power and provide independent control of real and reactive power in the transmission line. The experimental results have verified that the adopted control strategy is effective and feasible. Further investigations of dynamic perfornance of a UPFC are necessary for a more complicated power system.
REFERENCES: [1] Kataoka T., Hisa Y., Uchida Y., Ikeda Y., "A control strategy for a UPFC-based fast voltage compensator and its performance analysis," 2004 IEEE 35th Annual Power Electronics Specialists Conference, Vol.2, pp. 1513 - 1518, June 2004. [2] L.Gyugyi, T.R.Rietman, A.Edris, C.D.Schauder, D.R.Torgerson, S.L.Williams, "The Unified Power Flow Controller: A new approach to power transmission control," IEEE Trans. on Power Delivery, Vol.10, No.2, pp. 1085-1097,April. 1995. [3] K.R.Padiyar, K.Uma Rao, "Modeling and Control of Unified Power Flow Controller for Transient Stability," Electrical power & Energy Systems, Vol.3, pp. 1-"1, 1999. [4] I. Papic, P.Zunko, D.Povh, M.Weinhold, "Basic Control of Unified Power Flow Controller," IEEE Trans. on Power Systems, Vol. 12, No. 4, pp.1734-1739, Nov.1997 [5] S.Kannan, Shesha Jayaram, M.M.A.Salama, "Real and Reactive power Coordination for a Unified Power Flow Controller," IEEE Trans. on Power Systems, Vol. 19, No.3, pp. 1454-1461, Aug.2004. For Simulation Results of the project Contact Us
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