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Enhancing the PV power requires necessity to track the MPP robustly. Most techniques implemented to obtain MPPT have some drawbacks, one of them is the oscillation around the operating point. This paper suggests sliding mode control technique to minify this problem. The strategy of SMC is designing a sliding surface which set the operating point. Reaching this surface in finite time requires control law applied to the DC/DC converter gate. The PV peak power can be obtained smoothly at different conditions by changing the duty cycle of converter. The PV connected with grid via multilevel inverter. To prove the stability of the SMC comparison between P&O and SMC methods was done. SMC has low transient under sudden variation and reach the steady state point faster than P&O. The simulation results are implemented in SIMULINK. The results confirmed the robustness, good performance of SMC strategy at different environmental conditions. [ABSTRACT FROM AUTHOR]