Integrated distributed energy resources play a crucial role in modernized power systems. They can decrease emissions, decrease the resistive losses and add to the security and reliability of electric networks. They can be of different nature and may contain fossil-fuelled generating units, wind units, fuel cells, storage devices and solar panels. In this article, first different distributed energy resources are introduced briefly, then, the operation and control strategies of integrated distributed energy resources will be reviewed. The review of existing research works in this field and finding the research gaps can lead to useful directions for future researchers who are interested to work in this field.