Over-acceptance of megacity power grid risk defense system under sudden extreme faults

[ China Instrument Network Instrument R&D ] On October 29, 2018, the project “Study on the comprehensive defense system of megacity power grid under sudden extreme faults” undertaken by the Stabilization Company passed the on-site acceptance organized by Shenzhen Power Supply Bureau Co., Ltd. in Shenzhen, Guangdong. .

With the development of China's economy and the rapid increase of urbanization level, the number and scale of large cities are expanding rapidly. According to the forecast of the development scale of the medium and long-term power grids in the future, the power load of many large and medium-sized cities in China will reach a higher level in the next 10 to 20 years, and the demand for electricity is also increasing.

However, due to the sudden extreme faults such as typhoon, once the power outage occurs, the impact is huge. Therefore, the establishment of a megacity integrated network risk comprehensive defense system is very important for the social and economic benefits of the city.

To this end, in 2017, the Shenzhen Power Supply Bureau conducted a tender for the scientific and technological project “Research on the comprehensive defense system for mega-city power grids under sudden extreme faults”. The main contents of the bidding are: research on internal and external network model splicing and data integration technology; research on automatic generation technology of expected fault set in extreme weather; research on safety, stability and rapid analysis and early warning technology based on whole network data; research on auxiliary decision making to meet grid operation requirements Technology, etc.

After one year of research, the State Grid Nanrui Stabilization Company proposed the overall framework for the comprehensive defense of power grid operation risks under extreme extreme faults, and realized the risk assessment and risk prevention of megacity power grids under sudden external faults caused by extreme external natural disasters. Control decision-making; a stable multi-level scheduling data integration method for power grid is proposed. This method integrates automatic identification technology based on topology analysis and operation mode adjustment technology considering safety stability impact factor. It also proposes a typhoon. An online safety and stability analysis method for megacity power grids with disaster factors. Based on the line-tower-topographic geographic model and typhoon data, the method can calculate the line fault probability caused by typhoon by considering the terrain correction coefficient and automatically generate a fault set.

The acceptance expert group listened carefully to the work summary and research report made by the project team, reviewed the acceptance data, and conducted sufficient discussions and questions. It was agreed that the project completed the contents of the plan and task book, and the research results reached the expected goal. pass the inspection.

This breakthrough in the study of mega-city risk comprehensive defense system under sudden extreme faults can analyze, predict and provide auxiliary decision-making for the safety and stability of the grid under extreme fault conditions, and timely predict the extreme faults caused by the grid operation. Influencing and adopting targeted control means to provide technical support, strengthen the ability of power grid dispatching operators to deal with extreme external weather caused by grid accidents, and improve the safe operation level of power grids.

(Source: Nanrui Group Co., Ltd., Tendering Network, and News)