بهینهساز ولتاژ مرجع برای ردیابی نقطه حداکثر قدرت در سیستمهای فتوولتائیک متصل به شبکه سه بعدی

The problem of maximum power point tracking (MPPT) in photovoltaic (PV) arrays is addressed considering a PV system including a PV panel, a PWM DC/AC inverter connected to triphase grid. Interestingly, the proposed PV system features higher reliability and reduced cost as it involves no chopper and no radiation/temperature sensors, unlike standard systems. We seek the achievement of three control objectives: (i) the voltage reference must be designed so as to achieve maximum power point tracking (MPPT), (ii) the DC link voltage must be tightly regulated over a wide range voltage-reference variation, (iii) and the power factor correction (PFC) requirement must be satisfactorily realized. To meet these objectives, a multiloop controller is designed, using nonlinear design techniques, based on the nonlinear system model. Then, it is formally demonstrated that the proposed controller actually meets the desired control objectives.