Power grid repair artifacts come out

The day before, the School of Information and Electronic Engineering of Shandong Institute of Business and Technology obtained major scientific research achievements. The “Industrial Load Based Balanced Fault Recovery Method for Smart Distribution Network” jointly invented by six teachers officially obtained the national invention patent right, and was in the field of distribution automation. Filled the international blank.

Although the name is somewhat circumstantial, this technology is closely related to the people and can minimize the impact of blackouts on life. Dr. Pang Qingle, a member of the project team, told reporters that at present, the reliability rate of power supply in the general urban areas of China can reach 99.9% or more, and the average annual power outage of users is less than 3.5 hours; the center of important cities can reach more than 99.99%, and the average annual power outage of users is small. In 53 minutes; while the important urban areas in developed countries can reach 99.999%, the average annual power outage time of users is reduced to 5.26 minutes.

“The key to shortening the user's power outage time is to accelerate the speed of troubleshooting after the failure of electrical equipment.” Pang Qingle said, “The power grid fault recovery belongs to the field of distribution network automation technology, which has been monopolized by the developed countries and measures fault recovery. The main indicator of the technical level is the power supply reliability."

Although the current fault detection and fault location technology of the power grid is relatively mature, the long recovery time has been a problem that needs to be solved at home and abroad. After more than two years of extensive literature review, theoretical analysis, and experimental verification, Pang Qingle and members of the research team finally succeeded in inventing a "fast load recovery method based on load balancing."

Since the grid accident has the characteristic of “moving all over the body”, a fault often leads to a large-scale power outage in the surrounding area. Pang Qingle said that this method can quickly cut off the fault point after a grid fault occurs, and can quickly and automatically generate a fault recovery plan in less than 1 second. Users in non-fault power outage zones can recover power in a few seconds. Improve the self-healing ability of the power grid.

Research shows that if the current smart distribution network in China adopts this fault recovery method, the reliability of power supply can fully reach the level of developed countries, that is, the average annual power outage time of users will shrink from 3.5 hours to 5.26 minutes. If more advanced power supply grids are used, the reliability of power supply can exceed the level of developed countries.

Taking a power supply bureau with an annual sales volume of 5.617 billion degrees as an example, if the reliability of the power supply is only increased from the current commitment of 99.92% to 99.99%, the average annual power outage time of users can be reduced from 7 hours to less than 1 hour. It will increase the supply of 3.932 million degrees. According to the research results of the Institute of Electrical Engineering, the economic loss caused by a one-time supply of electricity at a power outage is about 40 yuan. This means that it can reduce the loss of 157 million yuan for local users, and greatly reduce the inconvenience caused by power outages to the people's lives. It has important theoretical guidance and engineering application value.