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  • 1. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 17 ENHANCED FAULT RIDE-THROUGH TECHNIQUE FOR PMSG WIND TURBINE SYSTEMS USING DC LINK BASED ROTOR-SIDE CONTROLLER Anas Abdulqader khalaf Bharati Vidyapeeth Deemed University, Pune ABSTRACT In the field of renewable energy generation has been observed wind energy. Where the technology is more rapid growth. It attracts attention as one of the most effective ways in terms of the cost of generating electricity from renewable energy sources. The system wind generation has application for support grid. Voltage of the wind generator permanent magnet synchronous generator (PMSG) is directly driven by a variable due to the sporadic nature of wind energy. Voltage fluctuation and power of major concern in the connected network systems generate electricity using a wind converter list. Inverter is essential for interaction of from wind sources with Ac network. There are many as possible inverter the topology and inverter switch plans and each one will have its comparative advantages and disadvantages. Synchronous generators used a variable speed the permanent magnet to extract the utmost of energy from wind energy conversion system. The is suggested common strategy for power control the permanent magnet synchronous generator a system based on wind energy conversion (WECS) operating under different the network conditions. In the strategy, is used by the converter generator to dominate the voltage The DC link converter side of the network is responsible for the controlling the energy flow injected into the grid. Console by the generator has the potential inherent damping of torsional oscillations caused by the characteristics of the drive train. It uses the control of the part of the grid to meet the (power) requirements of active and reactive current laws specified in the grid. At the same time alleviate the distortions from the current network fault even with non-symmetric. Errors through the network, the converted by the generator automatically reduces the current transformers to keep the prey DC voltage generator acceleration caused by that organization Pitch. Compared with the traditional strategy, chopper, DC, which aims to help ride through the fault of the WECS, Could be eliminated if you use the proposed plan. Compared with the control system variable regulator. The proposed strategy has the responses faster and more accurate power which is beneficial to the recovery grid. The simulation results CHECK the effectiveness of proposed strategies. The hybrid control scheme proposed for energy storage systems (ESS), helicopters braking fault ride through the capability and suppress fluctuation INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY (IJEET) ISSN 0976 – 6545(Print) ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME: www.iaeme.com/ijeet.asp Journal Impact Factor (2014): 6.8310 (Calculated by GISI) www.jifactor.com IJEET © I A E M E
  • 2. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 18 the power output of the permanent magnet synchronous generator (PMSG) of wind turbine systems. Errors through the grid. In DC link is controlled by the voltage link ESS rather than converting both sides of the line (LSC). While LSC is utilized as a STATCOM to inject the current recession in the grid to assist in the voltage grid. Index Terms: PMSGs, WECS, ESS, STATCOM, LSC. LITERATURE SURVEY 1) Modelling of grid-connected wind driven by the system using PMSG Rungs Kota method: Like the wind farm PMSG connected to the grid by solving differential equations which describe the using the method of Rungs Kota (Sermutlu 2004) as described by the RESOLUTION graph ends with temporal variation from currents. Voltages The active energy and reactive. 2) Wind power grid-connected Chipmunks cage induction generator (SCIG) the system: The wind driven by SCIG, The associated stator winding straight to the network and driven by the rotor from of wind turbines is converted to energy captured by of wind turbines into electrical energy by induction generator The broadcast on the grid by the pro-winding. Are controlled in a corner of the pitch in order to reduce the production of generator power to their face value at high wind speeds. In order to generate energy, it must be induction generator the speed of slightly higher than synchronous speed. Is providing reactive force absorbed by the induction generator by the grid or by certain devices such as the capacitor the banks, SVC, STATCOM or synchronous condenser (The Math Works 2008A) The analysis is based on transient current the system simulation on MATLAB / SIMULINK for approximate wind speeds fixed and variable. 3) grid-connected wind power doubling Fed Induction Generator (DFIG) the system: The wind driven by doubling-fed induction generator (WTDFIG) Adapter AC / DC / AC linking among the rotor of the generator to the grid. Split transforms AC / DC / AC to the two components: The rotor side transforms (RSC) and the grid side transforms (GSC) and adapters are voltage sources that use IGBTs confined forced to compile AC voltage from a DC voltage source. And synthesizing voltage AC is at the frequency of the power and for the slip frequency for us. A capacitor connected to the DC side acts serves as the source of DC voltage. The of Couplings inductor L use a to connect to the grid. The rotor is connected to a three-phase filter by slip rings and brushes The associated stator three-phase filter straight to the grid. Is converted to energy captured by the wind turbines into electrical power by induction generator and transmitted to the grid from the stator and rotor windings. Control system generates a corner of the pitch signals fait accompli default and effort of VGC and respectively for control of the power compared to the wind turbines against the authorities of reference which have been obtained from the flow characteristic. A Proportional- Integral (PI) regulator is used to limit the power error to zero. While adjusting the bus voltage DC and reactive force or voltage The network stations (The Math Works 2010A). Compared to the system SCIG, The is based on transient analysis of the current the system also DFIG simulation MATLAB / SIMULINK for approximate wind speeds fixed and variable. Compare DESIGN OF WIND TURBINE BASED PMSG between literature survey CONTROL SCHEME and PROPOSED CONTROL SCHEME A PMSG-based WECS is simulated and analyzed when subjected to the system faults. the PMSG-based wind power unit connected to the utility grid via a step-up transformer and transmission line. This PMSG-based WECS was implemented in MATLAB/ SIMULINK, where the above three different converter models are used separately for the purpose of comparison.
  • 3. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 19 Design of the Unified Power Control for the MW Class PMSG-Based WECS IN matlab Fig. 1: PMSG BASED WECS WITH DC CHOPPER Fig. 2: PMSG BASED WECS WITH OUT DC CHOPPER We have different between the CONVENTIONAL CONTROL SCHEME and PROPOSED CONTROL SCHEME in block diagram (RSC)and(GSC) in fig3 .fig4 .fig5 fig6
  • 4. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 20 Fig 3: the system RSC in proposed control scheme Fig. 4: the system RSC literature survey control scheme Fig. 5: the system GSC in proposed control scheme
  • 5. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 21 Fig. 6: the system GSC literature survey control scheme SIMULATION RESULTS WITH PROPOSED AND LITERATURE SURVEY 1) Operation With Unsymmetrical Grid Faults A)With literature survey without Dc chopper and proposed technique with chopper –AG: Fig. 7: Rotor speed, EM torque and stator ‘A’ phase current for literature survey control scheme system for AG fault Fig. 8: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper for un symmetrical fault AG
  • 6. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 22 Fig. 9: DC link voltage for literature survey control scheme without dc chopper system for AG fault Fig. 10: DC link voltage for proposed system with chopper for un symmetrical fault AG Fig. 11: stator voltage and current for literature survey without dc copper control scheme system for AG fault
  • 7. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 23 Fig. 12: Grid voltage and current for proposed system with chopper for un symmetrical fault AG B) With literature survey without dc chopper and proposed technique with chopper –abg fault Fig. 13: Rotor speed, EM torque and stator ‘A’ phase current for literature survey without dc chopper control scheme system for ABG fault Fig. 14: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper for un symmetrical fault ABG
  • 8. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 24 Fig. 15: DC link voltage for literature survey control scheme system for ABG fault Fig. 16: dc link voltage across capacitor for proposed system with dc chopper for un symmetrical fault ABG Fig. 17: stator voltage and current for literature survey control scheme system for ABG fault
  • 9. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 25 Fig. 18: Grid voltage and current for proposed system with chopper for un symmetrical fault ABG. 2) Operation With Symmetrical Grid Faults: With literature survey without dc copper and proposed with dc chopper technique Fig. 19: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper It can be observed that speed and torque oscillations were high without chopper compared to with chopper and stator current drops to nearly zero value. Fig. 20: Rotor speed, EM torque and stator ‘A’ phase current for literature survey without dc chopper control scheme system for ABCG fault
  • 10. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 26 Fig. 21: DC link voltage for proposed system without chopper symmetrical fault The DC link voltage at capacitor also decreases from 1000V to zero without chopper and voltage decreases from 1000V to 400Volts. Hence voltage can be maintained much better with chopper circuit. It can also be verified that voltage and current at generator terminals decreases from unity pu to zero value without chopper and is maintained at 0.1pu with chopper. Fig. 22: DC link voltage for literature survey without dc chopper control scheme system for ABCG fault Fig. 23: Grid voltage and current for proposed system with dc chopper for symmetrical fault
  • 11. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 27 Fig. 24: stator voltage and current for literature survey control scheme system for ABCG fault CONCLUSION The converter-based WECS has the potential to improve the transient stability of the power system because of its quick power response. However, the rating of power devices limits its applications. In order to make maximal use of such systems, advanced control technique should be developed to satisfy the requirements of the power systems. The conventional control strategy for the PMSG-based WECS is mainly designed to promise the proper operation of the generator. In the strategy, the generator torque (power) is directly controlled while the grid side power is indirectly regulated. The disturbance at the generator side will aggravate the power responses at the grid side, which is not desired by the PSO. The basic idea of the proposed strategy is to first satisfy the power system requirements under different grid conditions. In the strategy, the active/reactive current (power) is directly regulated through the grid-side converter. In order to provide enough oscillation damping, additional active damping loop is integrated into the generated-side controller. Compared with the conventional or variable-structured control strategies, the proposed one has the quickest and most precise grid-side current (power) responses. During grid fault, no Dc chopper or controller switching is necessary with the strategy and the current distortions can be mitigated when the unsymmetrical grid fault occurs. Moreover, the proposed strategy requires no system parameters and is simple to implement, which makes it attractive for the engineering practice. However, such a strategy sacrifices the response of the generator-side variables and leads to the fluctuation of the dc- link voltage. It is believed that a large dc-link capacitor can be helpful to improve the system performance if the proposed strategy is employed. REFERENCES [1] M. Chinchilla, S. Arnaltes, and J. C. Burgos, “Control of permanent-magnet generators applied to variable-speed wind-energy systems con-nected to the grid,” IEEE Trans. Energy Convers., vol. 21, no. 1, pp. 130–135, Mar. 2006. [2] H. Polinder, F. F. A van der Pijl, and P. Tavner, “Comparison of direct-drive and geared generator concepts for wind turbines,” IEEE Trans. Energy Convers., vol. 21, no. 3, pp. 543–550, Sep. 2006. [3] F. Iov, A. D. Hansen, P. Sørensen, and N. A. Cutululis, “Mapping of grid faults and grid codes,” Risø Nat. Lab., Tech. Univ. Denmark, Roskilde, Denmark, Tech. Rep. Risø-R- 1617(EN), Jul. 2007. [4] C. Saniter and J. Janning, “Test bench for grid code simulations for multi-MW wind turbines, design and control,”IEEE Trans. Power Electron., vol. 23, no. 4, pp. 1707–1715, Jul. 2008.
  • 12. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 28 [5] J.-H. Jeon, S.-K. Kim, C.-H. Cho, J.-B. Ahn, and E.-S. Kim, “Development of simulator system for micro-grids with renewable energy sources,” J. Electr. Eng. Technol., vol. 1, no. 4, pp. 409–413, Feb. 2006. [6] R. Pollin, H. G. Peltier, and H. Scharber, “Green recovery: A new program to create good jobs and start building a low-carbon economy,” Center for American Progress, Washington, DC, Sep. 2008. Available:http://www.peri.umass.edu/fileadmin/pdf/other_publication_types/green_economic s/peri_report.pdf. [7] F. K. A. Lima, A. Luna, P. Rodriguez, E. H. Watanabe, and F. Blaabjerg, “Rotor voltage dynamics in the doubly fed induction generator during grid faults,” IEEE Trans. Power Electron., vol. 25, no. 1, pp. 118–130, Jan. 2010. [8] L. G. Meegahapola, T. Littler, and D. Flynn, “Decoupled-DFIG fault ride-through strategy for enhanced stability performance during grid faults,” IEEE Trans. Sustainable Energy, no. 3, pp. 152–162, Oct. 2010. [9] K.Rama Lingeswara Prasad and Dr.K.Chandra Sekhar, “A New Sensorless Control Strategy for a Variable Speed PMSG Wind Energy System Connected to Grid”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 5, 2013, pp. 146 - 154, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [10] Q. Song and W. Liu, “Control of a cascade STATCOM with star con-figuration under unbalanced conditions,” IEEE Trans. Power Electron., vol. 24, no. 1, pp. 45–58, Jan. 2009. [11] W. H. Zhang, S.-J. Lee, and M.-S. Choi, “Setting considerations of distance relay for transmission line with STATCOM,” J. Electr. Eng. Technol., vol. 5, no. 4, pp. 522–529, Jul. 2010. [12] Haider M. Husen, Laith O. Maheemed and Prof. D.S. Chavan, “Enhancement of Power Quality in Grid-Connected Doubly Fed Wind Turbines Induction Generator”, International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 1, 2012, pp. 182 - 196, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [13] H. M. Pirouzy and M. T. Bina, “Modular multilevel converter based STAT-COM topology suitable for medium-voltage unbalanced systems,” J. Power Electron., vol. 10, no. 5, pp. 572–578, Sep. 2010. [14] G. Brando, A. Coccia, and R. Rizzo, “Control method of a braking chopper to reduce voltage unbalance in a 3-level chopper,” inProc. IEEE Int. Conf. Ind. Technol., 2004, vol. 2, pp. 975–978. [15] J. F. Conroy and R. Watson, “Low-voltage ride-through of a full converterwind turbine with permanent magnet generator,”IET Renewable Power.Generation, vol. 1, no. 3, pp. 182–189, Sep. 2007. [16] W. Li, C. Abbey, and G. Joos, “Control and performance of wind turbine generators based on permanent magnet synchronous machines feeding a diode rectifier,” inProc. IEEE Power Electron. Spec. Conf., Jun., 2006,pp. 1–6. [17] B. Singh, R. Saha, A. Chandra, and K. Al-Haddad, “Static synchronous compensators (STATCOM): A review,”IET Power Electron., vol. 2, no. 4, pp. 297–324, 2009. [18] Bikram Das, Prabir Rn. Kasari, Abanishwar Chakraborti, Prasul Jain, Sanjay Raghuwanshi and Pawan Kr. Navin, “Battery Energy Storage and Power Electronics Based Voltage and Frequency Controller for WECS Connected to Grid”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 2, 2013, pp. 283 - 292, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [19] A. D. Hansen and G. Michalke, “Multi-pole permanent magnet syn-chronous generator wind turbines’ grid support capability in uninterrupted operation during grid faults,” IET Renewable Power Generation, vol.3, no. 3, pp. 333–348, 2009.
  • 13. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME 29 [20] Nadiya G. Mohammed, “Application of Crowbar Protection on DFIG-Based Wind Turbine Connected to Grid”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 2, 2013, pp. 81 - 92, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [21] X. Yuan, F. Wang, D. Boroyevich, Y. Li, and R. Burgos, “DC-link voltage control of a full power converter for wind generator operating in weak-grid systems,” IEEE Trans. Power Electron., vol. 24, no. 9, pp. 2178–2192, Sep. 2009. [22] D.-C. Lee, G.-M. Lee, and K.-D. Lee, “DC-bus voltage control of three-phase ac/dc PWM converters using feedback linearization,”IEEE Trans. Ind. Appl., vol. 36, no. 3, pp. 826–833, May 2000. [23] D.-E. Kim and D.-C. Lee, “Feedback linearization control of three-phase UPS inverter systems, ”IEEE Trans. Ind. Electron., vol. 57, no. 3, pp. 963–968, Mar. 2010. [24] S. Muyeen, M. Ali, R. Takahashi, T. Murata, J. Tamura, Y. Tomaki, A. Sakahara, and E. Sasano, “Comparative study on transient stability analysis of wind turbine generator system using different drive train mod-els,” IET Renewable Power Gener., vol. 1, no. 2, pp. 131–141, Jun. 2007. [25] V. Akhmatov, “Analysis of dynamic behavior of electric power systems with large amount of wind power,” Ph.D. dissertation, Dept. Elect. Eng., ørsted DTU, Denmark, 2003. [26] B. Rawn, P. Lehn, and M. Maggiore, “Control methodology to mitigate the grid impact of wind turbines,” IEEE Trans. Energy Convers., vol. 22, no. 2, pp. 431–438, Jun. 2007. [27] Dr. Rajseh Kumar Ahuja and Priyanka Phageria, “Dstatcom Based Voltage Regulator for Wind Turbine Driven Self-Excited Induction Generator”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 3, 2013, pp. 209 - 219, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [28] A. Hansen, G. Michalke, P. Sørensen, T. Lund, and F. Iov, “Co-ordinated voltage control of DFIG wind turbines in uninterrupted operation during grid faults,” Wind Energy, vol. 10, no. 1, pp. 51–68, 2007. [29] Nadiya G. Mohammed, HaiderMuhamadHusen and Prof. D.S. Chavan, “Fault Ride-Through Control for a Doubly Fed Induction Generator Wind Turbine Under Unbalanced Voltage Sags”, International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 1, 2012, pp. 261 - 281, ISSN Print: 0976-6545, ISSN Online: 0976-6553. [30] H. K. Khalil,Nonlinear Systems, 3rd ed. Englewood Cliffs, NJ: Prentice-Hall, 2002. [31] J. Hu and B. Wu, “New integration algorithms for estimating motor flux over a wide speed range,” IEEE Trans. Power Electron., vol. 13, no. 5, pp. 969–977, Sep. 1998. [32] P. Rodriguez, A. V. Timbus, R. Teodorescu, M. Liserre, and F. Blaabjerg, “Flexible active power control of distributed power generation systems during grid faults,” IEEE Trans. Ind. Electron., vol. 54, no. 5, pp. 2583–2592, Oct. 2007. [33] F. Wang, J. L. Duarte, and M. A. M. Hendrix, “Pliant active and reactive power control for grid-interactive converters under unbalanced voltage dips,” IEEE Trans. Power Electron., vol. PP, no. 99, pp. 1–1, 2010.