Abstract: For a certain area, there is a serious seasonal overload phenomenon of electricity load, and renewable energy sources have the problems of large power fluctuations and poor stability. This paper has developed multi-energy（hydropower, photovoltaic, and energy storage）, multi-port energy router device and its energy management system, comprehensively considering the local multi-scenario operation,solving the seasonal overload problem, and realizing the reasonable allocation and utilization of energy.First, the topology of each port converter of the energy router is selected for comparative analysis;secondly, the working mode under multiple scenarios is introduced; finally, the fault protection function test of the multi-energy complementary system with energy router is carried out. The test results show that the system has better fault protection function, effectively realizing the work mode switching in different scenarios, the DC bus voltage stabilization and upper power command tracking function, and can solve the problems of seasonal overload of local electricity load and large power fluctuations of renewable energy sources.