A dynamic strategy to improve the ride-through capability of a fixed speed induction generator

Abstract

Summary Based on the analysis of the short current of the fixed speed induction generator (FSIG) under symmetrical system faults, a strategy using the dynamic voltage restorer (DVR) is proposed to improve the low‐voltage ride through (LVRT) capability of FSIGs. During the system fault, LVRT‐DVR is connected in series between the grid and the generator by switching‐off the by‐pass bidirectional thyristors and provides a compensating voltage to isolate FSIG from the system fault. To increase the switch‐in speed of LVRT‐DVR, an antivoltage technique is used to shut the thyristors off immediately. After the fault is cleared, the phase‐shifting control is applied to avoid phase jumps of the FSIG terminal voltage. The PSCAD/EMTDC simulation and field tests have been carried out to prove the effectiveness of the proposed LVRT strategy, and related conclusions and comments are summarized.

Providing Fault Ride-Through Capability of Turbo-Expander in a Thermal Power Plant

“…Available FRT strategies have been proposed for doubly fed induction generator (DFIG)-based wind turbines, and are divided into three categories of protection circuit configurations, reactive power injecting-device installation, and modified converter control structures [7,8]. Among these strategies, the reactive power injecting-devices have been widely applied to provide FRT capability (especially DVR and STATCOM) [9][10][11][12], and can support other power quality problems [13,14]. This could also be considered the most appropriate choice for this study.…”

Performance improvement of wind‐driven self‐excited induction generator using fuzzy logic controller

“…Under such circumstances, the WECS is expected to remain intact to the grid so that blackout is avoided. Symmetrical system faults analysis is for the constant speed asynchronous generator is introduced in Hong et al 22 In this control method, the low voltage ride through (LVRT) ability is enhanced with help of the dynamic voltage restorer (DVR). Many of the existing wind turbine (WT) control systems are not equipped with the FRT feature.…”

“…SCIG is better than PMSG at medium speed of wind. Symmetrical system faults analysis is for the constant speed asynchronous generator is introduced in Hong et al 22 In this control method, the low voltage ride through (LVRT) ability is enhanced with help of the dynamic voltage restorer (DVR). During fault duration, DVR and LVRT are connected in series between the power grid and the generator by switching off the bypass bidirectional thyristors and give a compensating voltage to isolate speed induction generator from the fault place.…”