摘要： In this paper, a novel technique is proposed for mitigating lower order harmonics for single phase PV inverter using harmonic compensation. Step up transformer is used boost the voltage as per requirement of the grid. However, the implemented system will not introduce any lower order harmonics in the grid, but there are little chances of lower order harmonics, because of the dead time of inverter, core saturation and magnetizing current of the transformer, etc. In this paper, a unique approach is being presented which mitigates lower order harmonics using inverter current control. In this paper, adaptive harmonic compensation technique with additional active filter is being presented before feeding a supply to the grid. To obtain better control proportional resonant integral (PRI) controller is integrated. The advantage of using PRI controller is; it eliminates DC component from the control loop. In this paper, a PRI controller and LMS adaptive harmonic filter are also been discussed in great detail. In this paper, two systems are considered and compared one with an adaptive harmonic filter using SPWM, and in the second system, active filter is added before feeding inverter output to the step up transformer. Hence the first system is explained in great detail and for second system illustration of the active filter and obtained results are compared.