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Improving power quality and optimizing control
In February 2018, Liaoning Rongxin Xingye Power Technology Co., Ltd. and Jiangsu Offshore Wind Power Generation Co., Ltd. of State Power Investment Group successfully signed the SVG project of China Power Investment Dafeng H3#300MW offshore wind farm onshore centralized control center.
The project is located in the sea area to the north of Dafeng Liangyuesha in Yancheng City, Jiangsu Province. The total installed capacity of the platform is 302.4MW, the distance from the center to the shore is 43km, and the planned sea area is 90km2. 72 wind turbines with a single unit capacity of 4.2MW are installed in the platform, and the estimated annual power generation is about 850 million kWh.
There are two sets of 35kV 40M SVG in this RSVG project. Since the operation environment on the offshore platform is with high humidity and salt mist, RSVG adopts water circulation cooling method. In September 2018, two sets of equipment were successfully put into operation.
Different from the previous offshore platform SVG project of RongxinXingye, the project is the offshore wind power project with the farthest distance from the shore in China. The operation experience of this project has laid a solid and mature technical foundation for future offshore platform projects.
1. Reference case of renewable energy station wind power
project name: Huaneng Shanxi Dongmafang wind farm SVG project
application classification: wind farm
project requirements: control 110kV side busbar voltage of wind farm
At present, large-scale wind farms are composed of hundreds or even thousands of wind turbines with various types (doubly fed wind turbines, squirrel cage wind turbines, direct drive wind turbines, etc.), different control parameters and different operation modes. Most wind farms are located in remote areas, far away from the load center, and the short circuit ratio (SCR) of the grid connection point decreases with the increase of the number of wind turbines connected to the grid, forming a weak AC system. At the same time, large-scale wind farms often use high voltage direct current (HVDC) technology or series compensation technology to realize long-distance transmission. Relevant research shows that subsynchronous oscillation may occur when wind farm is integrated into weak AC system, series compensation system and HVDC system.
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