Abstract：For the phase tracking problem of single-phase voltage signals, a single-phase locked method with generating the non-orthogonal vector is proposed in this paper. After analyzing the traditional single-phase DQ PLL principle, a new phase detector is gained by constructing the non-orthogonal voltage vector based on adjacent time sampling data. A new phase discriminator is designed and applied to phase lock control of single-phase voltage signals. In addition, a phase locked control loop with double filters is designed aiming at the application in complex grid conditions. This design improves the precision of PLL control algorithm in harmonic grid conditions, and solves the problem of phase error caused by adding single filter. In this paper, the simulations of phase-locked system are carried out based on Matlab/Simulink, and the experimental prototype platform is built to verify the algorithm. The simulation and experimental results show that the proposed phase locked algorithm can accurately lock grid phase in complex grid conditions such as sudden change of phase, amplitude and frequency and harmonic disturbance, which shows a strong adaptability as well as excellent dynamic and steady performance.
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2019, Vol. 34 
