Boost-buck inverter variable structure control for grid-connected photovoltaic systems with sensorless MPPT

The present work describes the analysis, modeling and control of a transformerless boost-buck power inverter used as a DC-AC power conditioning stage for grid-connected photovoltaic (PV) systems. The power conditioning system's control scheme includes a variable structure controller to assure output unity power factor and a sensorless maximum power point tracking (MPPT) algorithm to optimize the PV energy extraction. To maximize the steady-state input-output energy transfer ratio a discrete linear controller is designed from a large-signal sampled data model of the system. The achievement of the DC-AC conversion at unity power factor and the efficient PVs energy extraction are validated with simulation results.

[1]  George C. Verghese,et al.  Principles of Power Electronics , 2023 .

[2]  K. Mahabir,et al.  Linear averaged and sampled data models for large signal control of high power factor AC-DC converters , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[3]  R. Schmidt,et al.  Control of an optimized converter for modular solar power generation , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[4]  Francesc Guinjoan,et al.  Sliding-mode control design of a boost-buck switching converter for AC signal generation , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[5]  Jongrong Lin,et al.  Implementation of a DSP-controlled photovoltaic system with peak power tracking , 1998, IEEE Trans. Ind. Electron..

[6]  Francesc Guinjoan,et al.  A fixed-frequency quasi-sliding control algorithm: application to power inverters design by means of FPGA implementation , 2003 .

[7]  M. Marchesoni,et al.  Experimental study of a power conditioning system using sliding mode control , 1996 .

[8]  Vassilios G. Agelidis,et al.  Inverters for single-phase grid connected photovoltaic systems-an overview , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[9]  George C. Verghese,et al.  An adaptive digital controller for a unity power factor converter , 1996 .

[10]  Ned Mohan,et al.  Utility-connected power converter for maximizing power transfer from a photovoltaic source while drawing ripple-free current , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[11]  Vadim I. Utkin,et al.  Sliding Modes and their Application in Variable Structure Systems , 1978 .

[12]  Dehong Xu,et al.  Power sensor-less MPPT control scheme utilizing power balance at DC link-system design to ensure stability and response , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).