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A control strategy for photovoltaic system connected to grid

Khalida Zazi

Photovoltaic energy has experienced great development. Research around the world covers this wide-ranging field, and tries to improve the performance of photovoltaic systems through manufacturing processes and the exploitation of new photovoltaic cell concepts and development of novel MPTT control strategies to ensure a good transfer of energy and eliminate the harmonics distortion of current and voltage in a photovoltaic system connected to grid a new ADRC technical control is implemented  to achieve maximum  power point (MPP).The performances of grid  connected photovoltaic power system using DC-AC power inverters is studied using an active disturbance rejection control ADRC strategy developed to extract the maximum power of the solar energy, to maintain constant the DC-bus voltage, and to inject a suitable current into the grid with power factor near unity. It is susceptible to power grid disturbance, sudden environment changes and parameters uncertainties. The design tool achieves the control objectives i.e. power tracking and robustness due to external climatic variation.

 ADRC method is a new technology for estimating and compensating uncertainties and disturbances, and has been explored and used recently as an alternative over classical techniques and especially PID controller. The aim  is to control the converter in even with variation of atmospheric conditions and  to ensure the regulation of the DC link voltage and  deliver a sinusoidal current via DC-AC power system to the grid with a unity power factor. This paper is expected to provide more ideas for the researchers to apply the ADRC in a real prototype for power electronic converters control. A comparison with other strategies is studied and promises prospect of ADRC in the future industryIn the present talk, I would try to discuss the

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