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The new integrated energy system is one of the best application scenarios to carry out multi-energy supply and utilization under the background of low carbon economy, which has important enlightenment significance to promote the optimization and adjustment of China's energy structure. Taking a distributed power station in Guangzhou as the research object, this paper described the basic characteristics, system composition and key technologies of the integrated energy system of multi-energy combined power supply. The system was based on the traditional combined cold, heat and power supply, and provided diversified energy services such as compressed air, photovoltaic/energy storage, electricity sales, contracted energy management, green traffic charging, and equipment maintenance and so on. The integrated energy service covered the whole industrial park and radiated to the surrounding areas, forming a smart, efficient, clean and low-carbon integrated energy service system. The research results provide new ideas and important references for the exploration of new integrated energy system services.

With economic development, the world's energy structure will undergo major changes, and energy will be transformed to low-carbon, market-oriented and digitalized direction. China clearly proposes to achieve the goal of peaking carbon emissions by 2030 and achieving carbon neutrality by 2060. After the rapid development of electric power industry in China, a large number of large-scale, centralized energy system are constructed. By the end of 2019, total installed capacity of power generation was 2.01 billion kW in China, ranking the first of the world. However, there are many problems in energy field in China, such as unreasonable energy structure, tight constraints of resources and environment, low energy utilization efficiency, and insufficient flexible peak-regulating power supply. Therefore, efficient and clean energy utilization is the inevitable result of energy development and reform. This paper systematically analyzed the current situation of Energy system in Europe, the path of energy transformation in Europe and the role of distributed energy system in the process of energy transformation. It also analyzed the current situation of energy structure and faced situation in China, the role of distributed energy system in the energy transition, and the key path of China's future energy transition. At the same time, it further analyzed the development status of distributed energy system and the research status of domestic and foreign research institutions in the field of multi-energy complementary and efficient cascaded utilization. Finally, based on the implementation of regional strategies such as the Yangtze River Delta, Pearl River Delta, Tianjin-Beijing-Hebei Region, economic belt along Yangtze River and Hainan Free Trade Zone, this paper analyzed the development prospects of regional energy systems centered on distributed energy system.

The multi-energy complementary distributed integrated energy supply system, which is typical of green, low carbon and high efficiency, has become the research focus in the energy sector at home and abroad. The basic concept, main technical characteristics, main components and key technologies of multi-energy complementary distributed integrated energy supply system were described. In addition, based on the energy supply needs and energy endowment of a typical science and technology innovation park in China, the comprehensive energy scheme of 'Integration of Five Aspects' was researched. The main energy supply system of this scheme includes gas distributed energy, distributed photovoltaic, distributed wind power, the sewage-source heat pump and energy storage, and the energy networks include electric power, heating power, refrigerant water, natural gas and reclaimed water. With intelligent technology, this scheme may achieve the 'source-network-load' system optimal operation and meet the different demand of energy consumers. Finally, some suggestions were given for the development and existing problems of China's multi-energy complementary distributed integrated energy supply system.

The IEC60870-5-101 protocol is mainly used for transmitting messages between the primary station and the substation of the power SCADA data monitoring and acquisition system.Since the message mainly adopts “frame check and sum” to ensure communication security,there is a common security risk among the intermediate personnel.In order to verify the communication problems of the 101 protocol,the communication system between the FTU and the main station of the feeder terminal was constructed,which collected the telemetry signal of the FTU mobile IoT card on the cloud server,and used the man-in-the-middle attack mode to use the ARP to intercept the communication data packet.To analyze the telemetry information in the data packet,try data tampering and successfully make the monitoring data not updated in time.Finally,an enhancement mechanism against external attacks was proposed.

The IEC60870-5-101 protocol is mainly used for transmitting messages between the primary station and the substation of the power SCADA data monitoring and acquisition system.Since the message mainly adopts “frame check and sum” to ensure communication security,there is a common security risk among the intermediate personnel.In order to verify the communication problems of the 101 protocol,the communication system between the FTU and the main station of the feeder terminal was constructed,which collected the telemetry signal of the FTU mobile IoT card on the cloud server,and used the man-in-the-middle attack mode to use the ARP to intercept the communication data packet.To analyze the telemetry information in the data packet,try data tampering and successfully make the monitoring data not updated in time.Finally,an enhancement mechanism against external attacks was proposed.