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Modelling a Stand-Alone Inverter and Comparing the Power Quality of the National Grid with Off-Grid System

  • Algaddafi, Ali ;
  • Brown, Neil ;
  • Rupert, Gammon ;
  • Al-Shahrani, Jubran
  • Received : 2016.02.17
  • Accepted : 2016.02.24
  • Published : 2016.02.29

Abstract

Developments in power electronics have enabled the widespread application of Pulse Width Modulation (PWM) inverters, notably for connecting renewable systems to the grid. This study demonstrates that a high-quality power can be achieved using a stand-alone inverter, whereby the comparison between the power quality of the stand-alone inverter with battery storage (off-grid) and the power quality of the utility network is presented. Multi-loop control techniques for a single phase stand-alone inverter are used. A capacitor current control is used to give active damping and enhance the transient and steady state inverter performance. A capacitor current control is cheaper than the inductor current control, where a small current sensing resistor is used. The output voltage control is used to improve the system performance and also control the output voltage. The inner control loop uses a proportional gain current controller and the outer loop is implemented using internal model control proportional-integral-derivative to ensure stability. The optimal controls are achieved by using the Sisotool tool in MATLAB/Simulink. The outcome of the control scheme of the numerical model of the stand-alone inverter has a smooth and good dynamic performance, but also a strong robustness to load variations. The numerical model of the stand-alone inverter and its power quality are presented, and the power quality is shown to meet the IEEE 519-2014. Furthermore, the power quality of the off-grid system is measured experimentally and compared with the grid power, showing power quality of off-grid system to be better than that of the utility network.

Keywords

Internal model control-proportional-integral.derivate controller (IMC-PID);Renewable energy system (RES);Stand-alone inverter;Total harmonic distortion (THD)

References

  1. Y. Xue, L. Chang, S. B. Kjær, J. Bordonau, and T. Shimizu, "Topologies of single-phase inverters for small distributed power generators: an overview," Power Electronics, IEEE Transactions, vol. 19, pp. 1305-1314, 2004. https://doi.org/10.1109/TPEL.2004.833460
  2. US Energy Information Administration international energy outlook 2014. Available: http://www.eia.gov/forecasts/ieo/index.cfm, accessed: [23/10/2015].
  3. D. P. Kaundinya, P. Balachandra, and N. H. Ravindranath, "Grid-connected versus stand-alone energy systems for decentralized power-A review of literature," Renewable and Sustainable Energy Reviews, vol. 13, pp. 2041-2050, 2009. https://doi.org/10.1016/j.rser.2009.02.002
  4. T.-S. Lee, S. Chiang, and J.-M. Chang, "$H{\infty}$ loopshaping controller designs for the single-phase UPS inverters," Power Electronics, IEEE Transactions, vol. 16, pp. 473-481, 2001.
  5. N. M. Abdel-Rahim and J. E. Quaicoe, "Analysis and design of a multiple feedback loop control strategy for single-phase voltage-source UPS inverters," Power Electronics, IEEE Transactions, vol. 11, pp. 532-541, 1996. Article (Cross Ref Link) https://doi.org/10.1109/63.506118
  6. Y. Xu, Y. Zhao, Y. Kang, and R. Xiong, "Study on IMC-PID control for single-phase voltage-source UPS inverters," Industrial Electronics and Applications, 2008. ICIEA 2008. 3rd IEEE Conference, pp. 824-828, 2008.
  7. Z. Keliang, L. Kay-Soon, W. Yigang, L. Fang-Lin, Z. Bin, and W. Yigang, "Zero-phase odd-harmonic repetitive controller for a single-phase PWM inverter," Power Electronics, IEEE Transactions, vol. 21, pp. 193-201, 2006. Article (Cross Ref Link) https://doi.org/10.1109/TPEL.2005.861190
  8. K. Zhang, L. Peng, J. Xiong, and J. Chen, "Statefeedback- with-integral control plus repetitive control for PWM inverters," Zhongguo Dianji Gongcheng Xuebao(Proceedings of the Chinese Society of Electrical Engineering), pp. 56-62, 2006.
  9. A. Mohan and D. Mathew, "High performance standalone and grid connected inverter using adaptive total sliding mode controller," Advanced Computing and Communication Systems (ICACCS), 2013 International Conference, pp. 1-6, 2013.
  10. W. Rong-Jong, W. Wen-Hung, and L. Chung-You, "High-Performance Stand-Alone Photovoltaic Generation System," Industrial Electronics, IEEE Transactions, vol. 55, pp. 240-250, 2008. https://doi.org/10.1109/TIE.2007.896049
  11. Available:"http://www.dataforth.com/catalog/pdf/an124_Tuning_Control_Loops_with_the_IMC_Tuning_Method.pdf", accessed: [24/10/2015].
  12. M. V. Subramanyam, K. S. Prasad, and P. V. G. K. Rao, "Robust control of steam turbine system speed using improved IMC tuned PID controller," Procedia Engineering, vol. 38, pp. 1450-1456, 2012. https://doi.org/10.1016/j.proeng.2012.06.179
  13. A. Labouret and M. Villoz, "Solar Photovoltaic Energy,"Institution of Engineering and Technology, 2010.
  14. J. F. Sultani,"Modelling, design and implementation of D-Q control in single-phase grid-connected inverters for photovoltaic systems used in domestic dwellings,"De Montfort University, 2013.
  15. M. Monfared, S. Golestan, and J. M. Guerrero, "Analysis, design, and experimental verification of a synchronous reference frame voltage control for single-phase inverters," Industrial Electronics, IEEE Transactions, vol. 61, pp. 258-269, 2014. https://doi.org/10.1109/TIE.2013.2238878
  16. IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems, IEEE Std 519-2014 (Revision of IEEE Std 519-1992), pp. 1-29, 2014.
  17. D. O. Neacsu, "Power-switching converters: medium and high power," CRC Press, 2014.
  18. M. Munsell, "9 Projects Defining the Next-Generation Electricity System," Available: "Article (Cross Ref Link)", accessed: [07/02/2016].

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