A study on high-performance single-phase phase-locked loop method based on synchronous sampling SDFT
In the traction drive control system of electric locomotives and rolling stock,the grid-side converter obtains phase infor-mation through a phase-locked loop and carries out precise control.The voltage amplitude and frequency of the traction power supply network fluctuate,and the network voltage often has serious distortion and contains a large number of harmonics,so the complex grid en-vironment puts forward high requirements for the performance of phase-locked loops.In combination with synchronous sampling,this paper proposes a high-performance phase-locked loop method based on SDFT.The performance of this method was verified through dig-ital simulation and semi-physical simulation tests.The test results show that,compared with several other mainstream phase-locked loop methods,this method has high steady-state phase-locking accuracy,fast dynamic response speed,and strong harmonic suppression and anti-bias capability,and is suitable for application in the field of rail transit.
NETL
NSTL
万方数据
