Micro-energy system is one of the important forms for the development and application of Energy Internet. A micro-energy system is a multi-input and multi-output system with a coupling relationship constituted by energy conversion and storage devices. These devices usually have non-linear working characteristics

which means deviation from the design performance. A static coupling model is established considering the nonlinear relationship between the input and output of a multi-energy microgrid. At the same time

the state transfer equation for energy storage is given. The integrated energy consumption of the system is defined by unified input energy. And a load dispatch scheme of energy conversion devices based on incremental rate is proposed. Finally

the model is applied and validated in a system which includes photovoltaic

distribution transformer

combined heat power generation

heat pump

battery storage and regenerative electric boiler. The proposed general model considering off-design performance of devices provides the basis for optimal design and operation of micro-energy system.