"Civil engineering and electrical parts have been inspected and accepted this time, and the inspection is qualified, and the DC system debugging conditions are available, and it can be started!" On October 10, under the operation of the staff of State Grid Suzhou Power Supply Company and NARI Group, it was located in Suzhou Industrial The "High Reliability Distribution Network Application Demonstration Project" in the park was successfully put into operation. After the project is put into operation, it will effectively improve the reliability of power supply in the area around Jinji Lake in Suzhou City, and at the same time mark the official completion of the country's largest comprehensive demonstration area for active power distribution networks.
In recent years, with the access of large-scale distributed clean energy and diversified loads, the reliability and safety of traditional distribution networks have been challenged. On the one hand, distributed clean energy represented by solar and wind energy is intermittent and random, and large-scale access will affect power quality and power supply reliability; on the other hand, diversified loads represented by electric vehicles will charge The time and space distribution is uncertain, leading to huge changes in the load structure and characteristics of the distribution network, and the traditional distribution network will not be able to meet its electricity demand. In order to solve the new challenges facing the development of the distribution network and to meet the people's growing demand for power supply services, it is urgent to build a more intelligent and active distribution network.
In December 2016, State Grid Corporation of China and the Suzhou Municipal Government signed the "International Energy Reform and Development Model Urban Smart Grid Project Agreement" to jointly promote the construction of smart grids. According to the agreement, a comprehensive demonstration zone for active distribution networks will be built in Suzhou to provide ideas and demonstrations for solving the problem of large-scale access to distributed energy and interactive participation of diversified power loads.
According to Dong Xiaofeng, the project manager of the comprehensive demonstration project of the active distribution network of the State Grid Suzhou Power Supply Company, the active distribution network is a distribution network that can realize distributed clean energy and diversified load interactive management. Compared with the traditional distribution network, it can predict potential faults in advance, intelligently isolate and automatically recover based on the big data of the distribution network information, greatly improving the power supply reliability of the distribution network. Through the optimized configuration of energy, the power loss is reduced, and the access capability of clean energy is further improved.
It is understood that the comprehensive demonstration project of the active distribution network in Suzhou includes the high-reliability distribution network application demonstration project in Suzhou Industrial Park, the active distribution network planning and application demonstration project based on "plug and play" technology, and the AC/DC based on flexible DC interconnection. Five sub-projects, including the application demonstration project of hybrid active distribution network technology, the application demonstration project of grid source-load (storage) coordinated control technology adapted to the active distribution network, and the Suzhou Industrial Park high power quality distribution network application demonstration project, are located in Suzhou City Jinji Lake area in the industrial park, 2.5 industrial park area and Suhong Road industrial area.
The area around Jinji Lake in Suzhou is a concentrated area of ​​important customers such as government agencies, financial institutions, and foreign high-tech enterprises, which has extremely high requirements for power supply reliability. In order to improve the reliability of power supply, the State Grid Suzhou Power Supply Company built the country's first four-port flexible DC converter system for the 20 kV power distribution network here. The system is like an "energy router", which can realize the interconnection and intercommunication of energy and information between ports, coordinate distributed energy and loads in an orderly manner, and effectively improve the efficiency of electric energy use and the reliability of power supply. After the system is put into operation, the average annual power outage time for users in this area will be reduced from the original 5.2 minutes to 1.57 minutes.
In the 2.5 industrial park area, the State Grid Suzhou Power Supply Company built a megawatt-level AC/DC hybrid power distribution network for the rapid development of distributed energy such as wind power generation and rooftop photovoltaic power generation, insufficient power supply capacity of the industrial park, and low energy utilization efficiency. Provide dual power supply power supply, and use the plug-and-play technology that integrates energy flow and information flow for the first time in China to realize the flexible access of distributed clean energy and diversified loads, reduce the construction cost of its grid connection, and reduce AC/DC conversion The power loss in the process improves the efficiency of power usage. In addition, the system has also adopted the island autonomous restoration strategy for the first time in China. When the distribution network fails, the non-faulty area can be automatically separated from the large grid, relying on internal distributed energy sources to achieve independent operation, thereby greatly improving the area’s Power supply reliability.
The power supply area of ​​Suhong Road Industrial Zone has various types of loads, including Samsung Electronics, Samsung LCD and many other companies that have high power quality requirements. Power quality issues such as voltage fluctuations and voltage sags (temporary voltage drops) will affect the normal operation of enterprise equipment, and severely cause production accidents such as product scrap and equipment damage. To this end, the State Grid Suzhou Power Supply Company adopted multi-DFACTS equipment coordinated control technology on the 20kV side of the 110kV Xinghua Substation in Suzhou to track voltage in real time, quickly respond to quality issues such as voltage fluctuations, and improve power quality and system stability. Sex. "Now, the number of voltage sags for key users has been reduced by 95%, effectively ensuring reliable power supply for sensitive loads." Dong Xiaofeng said.
After the completion of the comprehensive demonstration area for the active distribution network in Suzhou, it will realize the flexible consumption of a high proportion of distributed energy, intelligent configuration of high-quality electric energy, effectively improve the reliability of power supply and the scale of access to clean energy, and reduce environmental pollution, which is equivalent to reducing fuel consumption every year. 1577 tons of coal. In addition, for users, electricity consumption will also be more intelligent and proactive, not only can actively isolate faults and reduce losses caused by power outages, but also can optimize the configuration of distributed clean energy and energy storage output to achieve grid peak and valley reduction. In turn, the user's electricity bills are minimized.
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