Grid Equipment Malfunction Prediction of Association Rules Merging With Gray BP

Abstract

In PV microgrid control system, the delay and filter inductance value change will influence the response speed, stability and grid-connected current distortion rate of system. Therefore, this article proposes a power feedforward robust prediction dead-beat grid-connected control method. The system's response speed is sped up by introducing power feedforward. The robust prediction dead-beat control method is proposed to be used on grid-connected control to strengthen robustness of system and reduce distortion of grid-connected current caused by control delay and inductance value deviation. It also analyzes Z-domain dead-beat control model and discusses influences of delay and inductance value on system stability. This article gives the design method of robust prediction dead-beat control and performs stability analysis according to transfer function within Z-domain, determines selection scope of control parameters. The simulation and experiment results prove the effectiveness of the proposed control method.