## 1 Introduction  
In recent years, due to concentrated research in academia and extensive attention to field construction of the power industry, the intelligent level of the power system has been effectively promoted. However, there are also many practical problems with the smart grid (SG), such as heterogeneous communication networks, inconsistent information formats and an inability to share. In particular, due to the wide geographical distribution, diversified communication methods, a large number of devices and large differences in types, the distribution network faces many difficulties [1]. With more distributed energy accesses to the distribution network system, the type and quantity of information will increase substantially, and the data processing performance requirements for information system will be higher [2]. At the same time, the intelligent distribution network is a high-flow communication network with two-way information flow [3], which results in the communication network and information processing of distribution network are more complex. Especially the information processing of distribution networks involves not only the power application developers, but also network and communication developers. This involves the integration of technologies from different disciplines. However, there is currently no effective information interaction between the advanced applications of the power distribution system and its underlying computers and network technology, which makes information overlap and information compatibility issues worse. Especially in the development of advanced application software for intelligent application networks, there are some practical problems, such as the underlying communication interface and how to effectively obtain data in power application layer. When the software scale of power information is small, a special interface is generally designed for a specific application to solve the above problems. However, with the expansion of the intelligent distribution network application software, technical problems such as data interface diversification and power data resource sharing will become more prominent during the software development process [4]. The development of intelligent distribution network software mainly includes field intelligent electronic device (IED) and power advanced application program as well as their information interaction content. At present, modular design is widely used. When the software scale is large and involves the cross content of power and communication, the actual software development is easy to encounter difficulties such as modular division, data sharing and collaboration of different specialties. This paper will study the efficient power information processing method suitable for the intelligent distribution network communication and information system. Software-defined networking (SDN) achieves flexible control of network traffic by independently separating the control plane and data plane of network equipment [5]. Inspired by SDN technology, the virtual plane layer of power data is proposed in this paper. The virtual plane layer uses data warehouse to cache power data, and provides a unified data format interface to power advanced application software by the elaborate application scheduling. In this way, the proper separation of power data and communication information is realized, which is convenient for software developers of different disciplines. This paper is organized as followed. First, the information model of distribution network is analyzed. And then from the perspective of the distribution network information system, based on the power data, a multi-level distribution network information processing structure is proposed. For distribution network information systems with characteristics such as multi-source, heterogeneity, and multi-protocol, this paper adopts the method of constructing virtual plane layer.