马达发电机并网转速控制器设计及验证

Design and Validation of Grid-connected Speed Controller for Motor Generator

针对液压马达发电机节能特点,综合考虑风速预测与气动转矩因素,研究了液压风力发电机组调控过程的并网转速方案,确保机组实现稳定并网过程,并降低机组传动过程的载荷。试验结果表明:采用并网转速控制方式充分满足风电机组并网要求;平稳风速下,变量马达转速也形成了4 r/min的偏差值,设置比例节流阀能够减小变量马达转速波动性;随机风速下,设置节流阀后马达转速波动幅度降低,获得了4.5 r/min的低频波动幅度。试验结果验证了仿真的正确性;平稳风速下,加入节流阀后转速波动幅度则降低到了2 r/min,系统压力波动则降低到0.1 MPa;随机风速下,形成了0.2 MPa的波动值,转速波动在±2 r/min以内。该研究对提高风电并网效率具有很好的实际指导意义,易于推广应用。

According to the energy-saving characteristics of hydraulic motor generator and considering the wind speed prediction and aerodynamic torque factors,the grid-connected speed scheme of hydraulic wind turbine control process is studied to ensure the stable grid-connected process of the unit and reduce the load during the transmission process.The test results show that the proposed grid-connected speed control method can fully meet the grid-connected requirements of wind turbines.Under steady wind speed,the variable motor speed formed a deviation value of 4 r/min.Setting the proportional throttle valve could reduce the variable motor speed fluctuation.Under random wind speed,the motor speed fluctuation amplitude decreased after setting the throttle valve,and the low-frequency fluctuation amplitude of 4.5 r/min was obtained.The experimental results verified the correctness of the simulation.Under steady wind speed,the speed fluctuation amplitude was reduced to 2 r/min and the system pressure fluctuation was reduced to 0.1 MPa after the throttle valve was added.Under random wind speed,the fluctuation value of 0.2 MPa was formed,and the fluctuation of speed was within+2r/min.This research has a good practical guiding significance for improving the efficiency of wind power grid connection and is easy to be promoted and applied.