Title :
A Novel Decoupled Interconnecting Method for Current-Source Converter-Based Offshore Wind Farms
Author :
Popat, Miteshkumar ; Wu, Bin ; Zargari, Navid R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, ON, Canada
Abstract :
This paper presents a novel interconnecting approach for the permanent-magnet synchronous generator-based offshore wind farm, where cascaded pulsewidth modulated (PWM) current-source converters (CSCs) are employed on both generator- and grid-side. The total numbers of cascaded PWM CSCs for the onshore grid connection are equal to the number of wind generators installed in the wind farm. The proposed interconnecting method enables simple configuration without the need for a bulky and costly offshore converter substation. Furthermore, a new decoupled control scheme for the independent active and reactive power control with variable dc-link current regulation is developed for the grid-side converters. The key feature of the control scheme is that the minimized dc-link current control is achieved without the use of a long-distance communication link. Both simulation and experimental results are provided to verify the effectiveness of the proposed control scheme.
Keywords :
electric current control; machine control; offshore installations; permanent magnet generators; power generation control; power grids; reactive power control; synchronous generators; wind power plants; cascaded PWM CSC; cascaded pulsewidth modulated current- source converters; current-source converter-based offshore wind farms; dc-link current regulation; decoupled control scheme; decoupled interconnecting method; grid-side converters; independent active control; long-distance communication link; minimized dc-link current control; offshore converter substation; permanent-magnet synchronous generator-based offshore wind farm; reactive power control; wind generators; Capacitors; Generators; Pulse width modulation; Reactive power; Wind farms; Wind speed; Wind turbines; Communication link; current-source converter (CSC); dc-link current control; offshore wind farm; permanent-magnet synchronous generator (PMSG);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2191982