دانلود رایگان مقاله انگلیسی طراحی مقاوم میرایی فعال با برآورد فعلی برای اینورترهای تک مرحله ای Grid-Tied - نشریه IEEE 2018

Abstract

This paper presents an improved control scheme for operation of grid-tied inverters in order to attain IEEE 1547.2- 2008 harmonic limit standard even with a wide range of grid parameters. This control structure includes an active damping with a new current estimator and a proportional resonant (PR) controller with harmonic compensation (HC). In order to guarantees the inverter operation with a wide range of grid parameters the damping and the controller gains are designed considering robustness characteristics. Moreover, it proposes a new estimator for the current filter capacitor for operation with a wide range filter resonance frequency. The grid synchronization mechanism uses the MSOGI-FLL technique. Experimental results are carried out and presented to validate the control structure design and the proposed current estimation.

VI. CONCLUSION

This paper presents a robust design of active damping with current estimation to guarantees the good performance of single-phase grid-tied inverters with a range of grid parameters. The proposed control structure is designed to obtain suitable controller gains for strong or weak grids. In this way, higher controller gains can be used since the proposed active damping approach guarantees the stability of the system. Furthermore, a filter capacitor current estimation is proposed with a simple implementation, which allows operation with low and high filter resonance frequencies. The experimental evaluation confirms the appropriate control design since both grid connection and disconnection result in stable operation. Moreover, the THD=2.1% of output current complies with IEEE 1547.2-2008 standard and the active damping with the proposed current estimation stabilizes the grid-tied inverter operation for a wide range of grid parameters.