January 8, NARI Group Co., Ltd. came the news that the company's scientific and technological personnel are carrying out the world's first set of 1100 kV controllable shunt reactor proofing, debugging and other post-production equipment for the future to prepare for the project.
Recently, the world's first 1100 kV controllable shunt reactor developed by NARI Group passed the technical appraisal of China Institute of Electrical Engineering. This indicates that our country has fully mastered the core technology of UHV controllable shunt reactors and is of great significance for ensuring the safe operation of UHV power grids and promoting the construction of a global energy Internet.
It is understood that in the early formation of UHV AC grid, relying on the installation of low-voltage side of the transformer reactive power compensation equipment, reactive power can basically solve the problem. As the construction of UHV power grid accelerates, the transmission power of the line will increase, and a great deal of reactive power will be absorbed by the line. The reactive power compensation capacity should be adjusted at any time according to the running status of the system. If the compensation capacity is not fixed or constant, the system voltage will be unstable and Degradation of operational reliability, increased system network loss.
The person in charge of the project said that in order to solve the above problems, the installation of controllable shunt reactors should be considered. It is a new type of flexible AC power transmission system technology, which can flexibly regulate its reactive power output capacity according to the change of system operation mode, solve the contradiction between reactive power compensation and limited overvoltage and fixed high resistance in different demands of UHV power transmission system, Reduce reactive loss, improve regulation and control flexibility, is to ensure that the UHV grid security, efficient, economical operation of one of the important equipment.
Previously, NARI Group, relying on "1000 kV controllable reactor key technology research" "1000 kV controllable reactor development and engineering demonstration" and other major national grid company science and technology projects, drawing 500 kV Xinzhou hierarchical controllable high resistance , 750 KV Dunhuang variable-level control of high-resistance projects such as the successful experience of a new type of high-voltage winding and inter-column connection structure for the study of the steady-state and electromechanical transient control strategy for the UHV grid, designed a multi- Protection and allocation of programs, breaking the hard magnetic control and heat, excessive loss and other technical bottlenecks, effectively solve the UHV AC reactive power compensation problems.
The successful development of the equipment and a series of tests, proofreading and debugging work have laid a solid foundation for its application in UHV projects and will drive and guide the development of relevant manufacturing industries such as transformers and high-capacity thyristor valves, Technical level, promote relevant domestic scientific research, design, manufacture, construction enterprise technological innovation has an important role.
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