大规模近海风电场VSC-HVDC并网拓扑及其控制

Topologies and Control of VSC-HVDC Systems for Grid-Connection of Large-Scale Offshore Wind Farms

针对大规模近海风电场地理分布上高度分散以及主要采用双馈式或直驱/半直驱式风电机组的特点,提出了相应的电压源型变流器的高压直流(voltage source converter based HVDC,VSC-HVDC)并网传输拓扑结构,并设计了相应的控制策略。为验证所提方案的可行性,利用Matlab/Simulink构建了一个近海风电场的5端口VSC-HVDC并网传输系统,并进行了系列仿真。仿真结果表明,所提VSC-HVDC方案可为大规模近海风电场的并网传输提供优化的解决方案。

Considering the geographic dispersive distribution of large-scale offshore wind farms and the feature that doubly-fed wind power generators or direct-driven/ hybrid-driven wind power generators are mainly adopted in them, a power transmission topological structure of VSC-HVDC system corresponding to the connection offshore wind farms with power grid is proposed, and related control strategy is designed. To verify the feasibility of the proposed scheme, by use of Matlab/Simulink a 5-terminal VSC-HVDC system for the grid-connection of large-scale offshore wind farms is built and a series of simulation is performed. Simulation results show that the proposed VSC-HVDC scheme can offer optimized solutions for the grid-connection of large-scale offshore wind farms.