For a combined cooling heating and power (CCHP) microgrid including photovoltaic, storage battery and CCHP, and under the conditions of fulfilling the multiple energy demand for subscribers and interacting with the distribution system, and based on part load ratio models of the principal components in the microgrid including the micro turbine, heat recovery steam generator (HRSG) and refrigerating machines as well as the combined cooling heating and power (CCHP), a 0-1 mixed integer nonlinear programming (MINLP) model for day-ahead CCHP microgrid dynamic economic dispatch is established with the target of minimizing the total operating energy cost. Furthermore, the differences between the part load ratio based model and the constant efficiency model of the components are compared in dispatch scheme optimizing and total operating cost via solution of a residence building CCHP-type microgrid during a typical summer day. It turns out that the error between these two models cannot be ignored in dispatch scheme optimizing, and the result of part load ratio model is more precise. What’s more, the model error from the cooling load is more considerable.