Direct prediction compensation strategy of unified power quality conditioner based on FCS-MPC

Abstract

The finite control set model predictive control (FCS-MPC) has drawn considerable attention in the integrated controlof the unified power quality conditioner (UPQC) due to the characteristics of high dynamic response, internal decoupling andmultiple constraints. In this study, a new direct prediction compensation strategy (DPCS) based on FCS-MPC is proposed,which eliminates the harmonic detection algorithm, simplifies the UPQC controller structure and reduces the steady-state errors.By compensating for the time delay of FCS-MPC, the UPQC can mitigate the power quality problems more accurately andtimely. The FCS-MPC value function can be with various constraints, which makes the UPQC suitable for more situations.Compared with the indirect prediction compensation strategy, the designed DPCS has better time-delay compensation effects,which can reduce the harmonic components of the user-side under transient disturbances. The simulation results show that theproposed compensation strategy can achieve better dynamic and steady-state performance on power quality problems such asvoltage sags, swells, interruptions and harmonics.