Lyapunov Function Based Control for Grid-Interfacing Solar Photovoltaic System with Constant Voltage MPPT Technique
In this paper nonlinear control design to obtain high performance from solar PV system using three-phase grid-connected LCL-filtered voltage source inverter is presented. The grid-connected system is modeled in the synchronously rotating frame. For perfect synchronization of solar photovoltaic and clean power injection to the grid new control based on Lyapunov function is used. Lyapunov function based control is derived from the Lyapunov’s direct method which guarantees the global stability of the closed-loop system. The output PV voltage is used as DC link voltage which will be maintained at its reference value using constant voltage MPPT tracking method. In the proposed control strategy, the measurement of inverter currents, capacitor voltages and grid currents are essential. The generation of reference functions in the d- and q-components can be achieved by using the reference d-component grid current. The performance of the proposed scheme and its developed control strategy, are validate using MATLAB Simulink.
KeywordsSingle-stage inverter Photvoltaic system Lyapunov function based control
- 1.Lena, G.: Rural Electrification with PV Hybrid Systems. International Energy Agency, pp. 7–10, July 2013Google Scholar
- 7.Sanders, S.R., Verghese, G.C.: Lyapunov-based control for switched power converters. In: 21st Annual IEEE Conference on Power Electronics Specialists, pp. 51–58 (1990)Google Scholar
- 13.Ahmed, K.H., Finney, S.J., Williams, B.W.: Passive filter design for three-phase inverter interfacing in distributed generation. In: 2007 Compatibility in Power Electronics, pp. 1–9 (2007)Google Scholar
- 20.Sen, S., Yenduri, K., Sensarma, P.: Step-by-step design and control of LCL filter based three phase grid-connected inverter. In: 2014 IEEE International Conference on Industrial Technology (ICIT), pp. 503–508 (2014)Google Scholar