Luxi Island microgrid system, which was designed, supplied, commissioned, and delivered by NR, has been successfully put into operation.
The system effectively solved the black start problem of a 10 kV feeder level microgrid with impulsive load, and has won high recognition from users with advanced and intelligent control strategy, a stable and reliable microgrid system.
Microgrid integrated solutions
NR provides microgrid-integrated solutions including microgrid energy management systems
Luxi Island is located on the east coast of China. The power supply of Luxi Island was transmitted remotely by submarine cables, which was easy to caused power supply interruption due to cable and tower damage. Due to the weak load-carrying capacity of the original microgrid system, complex black start steps, difficult operation, and low success rate, once the power was cut off, the recovery time was long, which seriously affected the production and life of residents on the island.
NR provides microgrid integrated solutions including microgrid energy management systems, microgrid coordination controllers, energy storage converters, and other core equipment, which effectively solves the existing problems.
Research of microgrid technology
Microgrid system was required to quickly restore the power supply after the power loss of a large power grid, and the black start function was the most important means to restore the power supply and an important guarantee for the stable operation of the system. 10 kV distribution network feeders usually have a large number of T-connected transformers, large load capacity. The simultaneous start of transformer inrush current and a large number of motor loads was easy lead to black start failure.
10 kV dispersal network feeders have a large number of T-connected transformers, large load capacity
The automation level of the existing distribution network system was low, relying on the manual opening and closing switch of the operation and maintenance personnel, and the power failure time of the system was long. In view of these problems, based on the long-term accumulation in the research of microgrid technology, NR successfully realized the black start function under the condition of full input of 10 kV feeder load through intelligent one key black start control and flexible synchronous parallel start technology of multiple converters.
Advantages of NR in the field of microgrid
The whole process took less than 10s from the issuance of a command to the stable establishment of bus voltage, and quickly realized power supply restoration of 18 transformers, 1359 resident users, and 177 non-resident users. The power supply reliability of Luxi Island has been significantly improved.
The successful implementation of the project has further consolidated the technical advantages of NR in the field of microgrid, and provided the solution for the local autonomy of the new distribution system with high distributed energy resource penetration. NR will continue to practice the corporate purpose of "creating value and serving the society", and contribute more to the development of a reliable green power system.
