Title :
Improving the Dynamics of Virtual-Flux-Based Control of Three-Phase Active Rectifiers
Author :
Gonzalez Norniella, Joaquin ; Cano, Jose M. ; Orcajo, Gonzalo A. ; Rojas, Carlos H. ; Pedrayes, Joaquin F. ; Cabanas, Manes F. ; Melero, Manuel G.
Author_Institution :
Dept. of Electr. Eng., Oviedo Univ., Gijon, Spain
Abstract :
Virtual flux (VF)-oriented control (VFOC) and VF-based direct power control (DPC) (VF-DPC) have been developed to improve voltage-oriented control and DPC of three-phase active rectifiers. The VF space vector is utilized in transformations between stationary and rotating coordinates in VFOC and in obtaining instantaneous power in VF-DPC. The VF space vector is calculated by integrating the grid voltage space vector. This integration is usually performed using a first-order low-pass (LP) (FOLP) filter, which counteracts the saturation and dc-drift problems associated with pure integrators. However, the dynamics of FOLP filters can be enhanced to a great extent. This paper presents a new, simple, and fast integration algorithm for VF-based control methods. Simulations and experimental tests on a VF-DPC-based system showed that the proposed algorithm leads to rapid recoveries after grid voltage sags occur. Moreover, the performance of VF-DPC under nonideal grids is discussed.
Keywords :
low-pass filters; power control; power grids; power supply quality; rectifiers; voltage control; DPC; FOLP filter; LP filter; VF space vector; VF-DPC; VF-based direct power control; VFOC; dc-drift problem; first-order low-pass filter; grid voltage sag; grid voltage space vector; three-phase active rectifier; virtual-flux-based control; voltage-oriented control; Estimation; Harmonic analysis; Heuristic algorithms; Power harmonic filters; Reactive power; Rectifiers; Vectors; Direct power control (DPC); instantaneous active and reactive power; integration algorithm; power quality; three-phase active rectifier; virtual flux (VF);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2013.2245614