Title :
Phase angle compensation control strategy for low voltage ride through of doubly-fed induction generator
Author :
Wang, W. ; Chen, N. ; Zhu, L.Z. ; Xu, D.G.
Author_Institution :
Electr. Eng., Harbin Inst. of Technol. for phD, Harbin, China
Abstract :
Crowbar-based control is one of the main low voltage ride through (LVRT) control methods for doubly-fed induction generator (DFIG), but converter is still at risk of being damaged by over-current at rotor side after crowbar exits during fault recovering period. For the issue, a model for fault process analysis based on equivalent dynamic model of DFIG is established. The mechanism of phase angle jumping when fault occurring and grid voltage recovering and its impact on vector orientating precision are analyzed. Based on this, jumping phase angle compensation principle is proposed to improve existing LVRT control strategy. Then the process of control is divided into four periods, i.e., normal operation period, crowbar switching period, crowbar exiting period and grid voltage recovering period. In normal operation and crowbar exiting period, stator flux orientation control of DFIG is applied. In crowbar switching period, IGBT pulses of rotor side converter are locked, but grid side converter maintains normal operation. In grid voltage recovering period, phase angle compensation control is applied. Simulation results show that over-current in grid voltage recovering period can be effectively limited by the proposed control strategy.
Keywords :
asynchronous generators; machine control; power convertors; power generation control; power generation faults; power grids; power semiconductor switches; power supply quality; wind power plants; DFIG; IGBT pulses; crowbar-based control; doubly-fed induction generator; equivalent dynamic model; fault process analysis; fault recovering period; grid voltage recovering period; low-voltage ride through control method; phase angle compensation control strategy; phase angle jumping compensation principle; rotor side converter; stator flux orientation control; vector orientating precision; wind power; Circuit faults; Induction generators; Low voltage; Position control; Rotors; Stators; Switching converters; Voltage control; Wind energy generation; Wind farms; Crowbar; doubly fed induction generator; low voltage ride through; phase angle compensation; phase angle jumping;
Conference_Titel :
Sustainable Power Generation and Supply, 2009. SUPERGEN '09. International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4934-7
DOI :
10.1109/SUPERGEN.2009.5348205