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Abstract
A hybrid pulse width modulated single-phase Transformer less grid-tie photovoltaic (PV) power system is proposed system. The PWM works when the ac output voltage is lower than the dc source voltage, otherwise the PAM operates the single-phase Transformerless inverter. The HPWM leads to the reduction of power loss, and the Transformerless capacitance and inductance. An effective control strategy is proposed for the new PV power system to manage the MPPT of PV panel, grid-tie power injection, and dc-link voltage. A grid-tie current controller, combining a repetitive controller and proportional-resonant regulator, achieves strong harmonic suppression, fast dynamic, and zero tracking error. Power loss estimation and impedance design are detailed. Experimental tests validate the HPWM, new PV power system with higher efficiency, and the related control method