【摘要】 采用了一种基于电网电压空间矢量定向的三相异步电机同步切换控制策略,解决海底泥浆举升钻井(SMD)系统中存在的大功率三相异步电机在进行变频/工频切换时冲击电流大的问题。设计了锁频环和基于二阶广义积分器(SOGI)的数字滤波器,改善电网电压谐波、频率波动、直流偏移对坐标变换结果的影响。通过在变频器输出侧加入电抗器,解决由交流接触器延时导致的冲击电流大的问题。最后,通过实验验证了方案的可行性。更多还原

【Abstract】 A three-phase asynchronous motor synchronous switching control strategy based on grid voltage space vector orientation was adopted,the problem of great impact current from high-power three-phase asynchronous motor in subsea mudlift drilling(SMD)system when switching from variable frequency(VF)to power frequency(PF)was solved.Frequency locked loop(FLL)and digital filter were designed to improve the influence of voltage harmonics,frequency fluctuation and DC offset on the results of coordinate transformation. A reactor was added at the output side of the inverter to solve the problem of great impact current caused by the delay of AC contactor. Finally,the feasibility of the scheme is proved by simulation and experiment.更多还原