This paper proposes a multi-frequency grid synchronization method in stationary frame αβ based in multiple reduced order generalized integrators (MROGI). The presented system is able to detect independently the positive and negative sequence components and also it is able to provide the selected sequence components (typically -5 and +7) in less computational time than other multi-frequency synchronization systems. Furthermore, simulated and experimental tests have been carried out for testing the performance of the proposed algorithm. Experimental tests validate the benefits of the presented algorithm in terms of burden time.