It is well-know that in systems composed of several digital processors, clock signals of individual units differ from each other due to clock drifts. This paper investigates the effect of clock drifts from voltage source inverters (VSI) in industrial microgrids. Particularly, a primary/secondary droop-free distributed control scheme is considered in order to evaluate its robustness against clock drifts. The study is carried out by fully experimental means using a laboratory microgrid.