In response to the challenges posed by the weak support of power electronics based renewable energy systems and the resulting decrease in the stability of high-proportion renewable energy power grids, the grid integration technology for synchronous motor-generator pair (MGP) is proposed, which enables renewable energy units to integrate into the grid via a real synchronous machine interface and actively provide frequency and voltage support to the grids. While some theoretical and experimental research has been conducted on MGP system, there remains a lack of actual operation experience and complete equipment. Addressing the operational issues of MGP systems integrated into actual microgrids, based on a practical MGP application case, investigates the coordinated operation methods and hardware for MGP. A coordinated control method in microgrids for MGP system is proposed, which can achieve control of power transmission and stable grid integration of MGP. Furthermore, a 10 kW integrated MGP grid integration device is developed, and through experiments, feasibility of the developed device is validated.