Energy gateway, household electrical appliance, DC micro power grid system and energy management method thereof

The invention discloses an energy gateway, a household electrical appliance, a DC micro power grid system and an energy management method thereof. The energy gateway comprises a DC input terminal used for connecting with the DC output terminal of an external solar power generation apparatus, and a first DC output terminal and/or a second DC output terminal used for supplying power for external DC electric appliances, wherein the first DC output terminal is directly in connection with the DC input terminal, and the second DC output terminal is in connection with the DC input terminal through a DC transformation apparatus. According to the invention, a grid-connected inverter can be omitted, equipment investment and electric energy conversion can be reduced, and the utilization efficiency of new energy photovoltaic generation can be improved. Further, household appliances directly employ DC power supply, and internal rectification modules can be removed, thereby reducing equipment investment and electric energy conversion loss, and eliminating harmonic pollution caused by the household appliances so as to avoid influencing electric energy quality.