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Applications of local systems for power generation connected to the utility power grid require tuning between the phase grid voltage and the voltage synthesized by the converter. The most widely accepted solution to provide tuning between time-varying signals is the use of a Phase-Locked Loop (PLL) system. The implementation of a phase tuner based on a PLL embedded in a digital signal processor (DSP) is presented, this tuning technique is aimed to assist DC-AC inverters of a single phase system of local energy generation for create a sine wave in concordance with the grid. In many cases, the reference signal obtained from the grid voltage is contaminated by harmonics, for this reason, a series of tests are presented in order to demonstrate the robustness of this tuning technique.