1.5MW双馈式变速恒频风电机组控制系统研究

Varying Speed Control Strategy of 1.5 MW Variable Speed Constant Frequeney Wind Turbine

变速恒频风电机组具有风能转换效率高、能吸收阵风能量、可以实现发电机和电力系统的柔性连接、"零冲击"并网、运行噪声小等优点,是国际上现代风力发电的主要发展方向之一。文章针对变速恒频风电机组的变速控制方式进行了研究,且以兆瓦级变速恒频风电机组为模型,对几种变速控制策略进行了仿真。并在对分析仿真结果的基础上,结合大型变速恒频风电机组的整机特点和控制方法的可行性,采用了功率闭环的变速控制策略;最后在自主研发的1.5MW变速恒频风电机组控制系统及变流器样机上,对变速运行的功率控制策略进行了大量实验和长期的现场试运行,验证了变速控制方式的可行性与实用性。

Variable speed constant frequency wind turbine has many advantages：higher efficiency of wind energy converting to electric power,absorbing gust energy,smoothly cutting into the network system,flexble connecting between wind turbine and network system and low operating noise.Currently the variable speed constant frequency technology has become one of the main development directions of wind power generation.Based on the model of MW class variable speed constant frequency wind turbine,this paper analyses three speed control methods,simulates corresponding characteristics of each method, and then gives discussions.On the condition of discussing and analyzing simulation results and allowing for the characteristics of large power variable speed constant frequency wind turbine and its control system,this paper adopts power control closed-loop strategy to realize variable speed operating.At last,this paper designs a control system of 1.5 MW variable speed constant frequency wind turbine,and takes sufficient experiments and long-time preliminary operation at a real Wind Farm,which validates the feasibility and practicability of varying speed control strategies on MW class variable speed constant frequency wind turbine suggested in this paper.