Abstract

Current Control logic plays an important role in the performance of Grid connected inverters. In the present work Adaptive Modified Hysteresis controller has been used for generation of switching pulses to the minimally switched grid connected inverter. Different from the previous works the new control logic helps in maintaining the instantaneous switching frequency low and nearly constant with reduction of switching losses to one-third of that of the conventional type. Considerable reduction in Total harmonic distortion of supply current, better DC bus voltage stabilization, good reactive power compensation, satisfactory performance under unbalanced source and load conditions and good dynamic response is also achieved. The experimental verification is done using SIMULINK/REALTIME WINDOWS TARGET. Present control logic is compared with conventional hysteresis controller with and without adaptive control to prove the effectiveness.

Keywords:

Adaptive current control, modified hysteresis controller, reactive power compensation, switching frequency, switching losses, total harmonic distortion,

References

1. Belaidi, R., A. Haddouche and H. Guendouz, 2012. Fuzzy logic controller based three-phase shunt active power filter for compensating harmonics and reactive power under unbalanced mains voltages. Energ. Proc., 18: 560-570.
   CrossRef    
2. Hamrouni, N., M. Jraidi and A. Cherif, 2008. New control strategy for 2-stage grid-connected photovoltaic power system. Renew. Energ., 33: 2212-2221.
   CrossRef    
3. Hossain, M.N., T.K. Routh, A.H. Bin Yousuf, M.M. Asasduzzaman, M.I. Hossain and U. Husnaeen, 2012. Design and development of a grid tied solar inverter. Proceeding of the EEE/OSA/ IAPR International Conference on Infonnatics, Electronics and Vision, pp: 1054-1058.
   
4. Ilango, K., P.V. Manitha and G.N. Manjula, 2012. Modified icosf controller for shunt active filter interfacing renewable energy source and grid. AASRI Proc., 2: 62-68.
   
5. Jayachandran, J., N. Muthu Preethi and S. Malathi, 2013. Application of fuzzy logic in PWM technique and DC link voltage control for a UPQC system. Int. Rev. Model. Simulat., 6(4): 1198-1204.
   
6. Murat, K. and O. Engin, 2005. An adaptive hysteresis band current controller for Shunt active power filter. Electr. Pow. Syst. Res., 73(2): 113-119.
   CrossRef    
7. Nabil, A.A., A.K. Al-Othman and M.R. Alrashidi, 2011. Development of an efficient utility interactive combined wind /photovoltaic/fuelcell power system with MPPT and DC bus voltage regulation. Electr. Pow. Syst. Res., 81: 1096-1106.
   CrossRef    
8. Naimish, Z. and C. Ajitsinh, 2012. Control strategies for armonic mitigation and power factor correction using shunt active filter under various source voltage conditions. Electr. Pow. Energ. Syst., 42: 661-671.
   CrossRef    
9. Nandakumar, M. and K. Aseem, 2011. P-Q theory based shunt active filter with minimum switch utilisation. Proceeding of 2nd International Conference on Simulation Modeling and Analysis (COSMA, 2011). Amrita School of Engineering, Coimbatore, India.
   
10. Paal, E., Z. Weitzl and C.S. Choi, 2011. Grid management functions built in PV inverters for distributed power generation. Proceeding of the 8th International Conference on Power Electronics ECCE Asia. The Shilla Jeju, Korea, pp: 2637-2644.
    CrossRef    
11. Reza, N. and B.G. Gevorg, 2013. An investigation on combined operation of active power filter with photovoltaic arrays. Electr. Pow. Energ. Syst., 46: 392-399.
    CrossRef    
12. Tesfahunegn, S.G., A. Hajizadeh, T.M. Undeland, O. Ulleberg and P.J.S. Vie, 2009. Modelling and control of grid-connected PV/fuel cell/battery hybrid power system. Int. Rev. Model. Simulat., 2(4): 381-388.
    
13. Thekkath, P. and S.U. Prabha, 2013. Adaptive modified minimally switched hysteresis controlled shunt active power filter for harmonic mitigation. Proceedings of ACEEE, 4th International Conference on Control, Communication and Power Engineering (CCPE, 2013), 2: 91-98.
    
14. Tsang, K.M. and W.L. Chan, 2013. Three-level grid-connected photovoltaic inverter with maximum power point tracking. Energ. Convers. Manage., 65: 221-227.
    CrossRef    

Competing interests

The authors have no competing interests.

Open Access Policy

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Copyright

The authors have no competing interests.