液压型风力发电机组并网冲击抑制研究

摘要

Taking a hydraulic wind turbine as the research obj ect,mathematical models for wind turbine,fixed displacement pump�variable displacement motor of hydraulic system,synchronous genG erator and excitation system were established,for the problem of grid impact in hydraulic wind turG bine.The mathematical models for impulse current and impact torque were derived.A suppression method for grid impact in hydraulic wind turbine was proposed,by the combination of generator speed control,excitation voltage control and quasi�synchronization monitoring.Using 30 kV�A hydraulic wind turbine simulation platform as the simulation and experimental foundation,the grid impact supG pression was researched.Simulation and experimental results show that the grid impact suppression proposed has good control effect for impulse current and impact torque,achieving the flexible grid�connection for generator.%以液压型风力发电机组为研究对象，针对其并网冲击问题，建立了风力发电机数学模型、定量泵变量马达液压调速系统数学模型、同步发电机与励磁系统数学模型，推导了并网过程的冲击电流与冲击转矩数学模型。以数学模型为基础，提出了液压型风力发电机组并网冲击抑制方法，即通过发电机稳速控制、励磁电压控制和准同期监控相结合对机组并网冲击进行抑制。以30 kV�A 液压型风力发电机组实验台为仿真和实验基础，对机组并网冲击抑制展开研究。仿真和实验结果表明，所提出的并网冲击抑制方法对并网冲击转矩和冲击电流具有较好的控制效果，基本实现了机组柔性并网。