## 4 Power Data Virtual Planet Layer
### The Idea of Design  
The design idea of the power data virtual plane layer in this paper is inspired by the \"separation processing\" in SDN technology. The SDN technology decouples the data plane and the control plane to realize the flexible control of the network flow and effectively reduce the equipment load. The power data virtual plane layer also plays the similar role of functional separation in SDN, but the object is the power data interaction between the power advanced application and the underlying equipment, as shown in Figure 3. This virtual plane layer is inserted between the application layer and the data layer to \"separate\" data processing from protocol processing. In this way, the upper-level power advanced applications can focus on the use of power data and complete the business efficiently. The underlying distribution network equipment focuses on data collection and transmission, and there is no need to consider the problem of interfacing with the upper layer software. The virtual plane layer in the layer processing structure is similar to the SDN controller. The SDN controller controls the forwarding path of the traffic, separates the control function and the forwarding function of the traffic, and realizes the fast forwarding of packets [14; 15; 16]. The virtual plane layer is responsible for unifying the data format of the distribution network application, separates the format processing and protocol processing of the data, and solves the compatibility between the advanced application of the distribution network and the underlying equipment. Starting from the layer processing structure of the power information, the following describes in detail, the position of the power virtual plane layer and its functions [17]. In addition to designing advanced application functions, intelligent distribution network application software also involves how to obtain basic application functions such as power data. Based on the layer structure, the following will analyze the processing of power data in distribution network [18], as shown in Figure 4. The sensing and execution equipment of the physical layer in the distribution network is directly connected to the primary equipment of the grid. The above driver layer controls the underlying device, including controlling the analog-to-digital conversion loop to acquire analog data, or transmitting and receiving the corresponding communication message through the network driver. For the distribution network information exchanged by the communication network, the communication protocol layer parses or frames the information message. For example, the classic Ethernet communication method uses TCP/IP protocol to process information. At present, power data often adopts information models such as IEC61968, IEC61970, IEC60870, and IEC61850 [19]. And decomposition of electrical quantity is performed at the power protocol layer according to the adopted information model. With the application of big data and cryptography technologies in  
Figure 3: Power virtual plane inspired by software-defined networking (SDN). power information systems [20], power data gradually adopts methods such as compression [21], authentication, encryption and decryption to reduce the amount of data and enhance information security [22]. Therefore, specific power data values are generally parsed at the data layer and then provided to advanced applications in the distribution network. Diversified distribution networks involve different layers of information, different protocols, etc., which makes the distribution network have great differences in processing different information. This makes it difficult to handle information in terms of compatibility and sharing. The intelligent distribution network is a heterogeneous, multi-source, multi-protocol network. This feature has caused problems such as difficulty in sharing distribution network information and difficulty in developing and implementing intelligent distribution network software.