The Research On The Topologies And Coordination Control Of VSC-HVDC For Grid Connection Of Wind Farm

With the economic and social development, non renewable energy has been exhausted, wind power, as a kind of safe and clean renewable energy has received more and more attention. If the wind farm with AC line network, let power will control a remote wind farms, sea wind farm network. In addition, large-scale wind farm interconnection will cause voltage of power system, on the stability of the power grid greater impact.Flexible HVDC system(VSC-HVDC) is a common solution to this problem. The paper focuses on the topology model and multiple wind farms in southern Hebei, which is based on the flexible HVDC transmission system, and the VSC-HVDC coordination control technology:1. Established the mathematical model of VSC-HVDC in the dq synchronous rotating coordinate system, discusses the interconnection of wind farms of double closed-loop vector control strategy. Control strategy and model of the converter station are respectively studied according to the different operation conditions.Research and analysis the development of wind power industry In Cangzhou region and wind power consumptive ability of Southern Hebei Power grid.2. The Cangzhou area of wind power industry development and Southern Hebei Power Grid of absorptive capacity of wind power were research and analysis, expounds the necessity VSC-HVDC network in order to improve the access mode of the wind farm and improve the South Hebei Power Network ability of accepting wind power.3. Consider with present situation of the construction of Cangzhou area offshore wind farm and Southern Hebei power grid wind power receptiveness, the possibility of power supply by HVDC flexible system to the Southern Hebei Power grid are analyzed, and a simple multi terminal VSC-HVDC transmission model is established with the characteristics of power grid.