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 10kV feeder level microgrid with impulsive load, and has won high recognition from users with an advanced and intelligent control strategy, a stable and reliable microgrid system.
Power supply of Luxi Island
The power supply of Luxi Island was transmitted remotely by submarine cables
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 cause 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 affects the production and life of residents on the island.
Microgrid energy management system
NR provides microgrid integrated solutions, including a microgrid energy management system, a microgrid coordination controller, an energy storage converter, and other core equipment, which effectively solves the existing problems.
A microgrid system was required to quickly restore power supply after a power loss of the large power grid, and the black start function was the most important means to restore power supply and an important guarantee for the stable operation of the system. 10kV distribution network feeders usually have a large number of T-connected transformers, large load capacity.
Research of microgrid technology
NR successfully realized the black start function under the condition of full input of 10kV
The simultaneous start of transformer inrush current and a large number of motor loads was easy lead to black start failure. 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 10kV feeder load through intelligent one-key black start control and flexible synchronous parallel start technology of multiple converters.
Technical advantages of NR
The whole process took less than 10s from the issuance of 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 society", and contribute more to the development of a reliable green power system.
