scholarly journals DESIGN AND CONTROL OF LOW VOLTAGE RIDE THROUGH FOR PV-GRID APPLICATIONS

2020 ◽  
Vol 7 (09) ◽  
Keyword(s):  
Low Voltage ◽  
Low Voltage Ride Through ◽  
Grid Applications ◽  
And Control ◽  
Pv Grid

Improved Control Strategy of Wind Turbine with DFIG for Low Voltage Ride through Capability

2014 ◽  
Vol 707 ◽  
pp. 329-332
Author(s):  
Li Ling Sun ◽  
Dan Fang
Keyword(s):  
Wind Turbine ◽  
Control Strategy ◽  
Low Voltage ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Operating Characteristics ◽  
Low Voltage Ride Through ◽  
Doubly Fed ◽  
Rotor Side Converter ◽  
And Control

As the number of doubly fed induction generator (DFIG)- based wind-turbine systems continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability, especially under the condition of grid voltage dips. This paper, depending on the operating characteristics of doubly-fed induction generator during grid faults ,deals with a protection and control strategy on rotor-side converter (RSC) to enhance the low voltage ride through capability of a wind turbine driven doubly fed induction generator (DFIG). The simulation and experiment studies demonstrate the correctness of the developed model and the effectiveness of the control strategy for DFIG-based wind-turbine systems under such adverse grid conditions.

scholarly journals Low-Voltage Ride-Through Techniques in DFIG-Based Wind Turbines: A Review

2020 ◽  
Vol 10 (6) ◽  
pp. 2154 ◽  
Author(s):  
Boyu Qin ◽  
Hengyi Li ◽  
Xingyue Zhou ◽  
Jing Li ◽  
Wansong Liu
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Wind Turbines ◽  
Internal Control ◽  
Low Voltage ◽  
Wind Power Generation ◽  
Low Voltage Ride Through ◽  
Protection Circuits ◽  
Doubly Fed ◽  
And Control

In recent years, considerable advances were made in wind power generation. The growing penetration of wind power makes it necessary for wind turbines to maintain continuous operation during voltage dips, which is stated as the low-voltage ride-through (LVRT) capability. Doubly fed induction generator (DFIG)-based wind turbines (DFIG-WTs), which are widely used in wind power generation, are sensitive to disturbances from the power grid. Therefore, several kinds of protection circuits and control methods are applied to DFIG-WTs for LVRT capability enhancement. This paper gives a comprehensive review and evaluation of the proposed LVRT solutions used in DFIG-WTs, including external retrofit methods and internal control techniques. In addition, future trends of LVRT solutions are also discussed in this paper.

scholarly journals Topology and Control Strategy of PV MVDC Grid-Connected Converter with LVRT Capability

2021 ◽  
Vol 11 (6) ◽  
pp. 2739
Author(s):  
Huan Wang ◽  
Yu Zhou ◽  
Xinke Huang ◽  
Yibo Wang ◽  
Honghua Xu
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Low Voltage ◽  
Current Control ◽  
Medium Voltage ◽  
Low Voltage Ride Through ◽  
Feedback Capacitor ◽  
Lc Filter ◽  
And Control ◽  
Medium Voltage Dc

This paper proposes an isolated buck-boost topology and control strategy for the photovoltaic (PV) medium-voltage DC (MVDC) converter with low-voltage ride through (LVRT) capability. The proposed isolated buck-boost topology operates on either boost or buck mode by only controlling the active semiconductors on the low-voltage side. Based on this topology, medium-voltage (MV) dc–dc module is able to be developed to reduce the number of modules and increase the power density in the converter, which corresponds to the first contribution. As another contribution, a LVRT method based on an LC filter for MVDC converter is proposed without additional circuit and a feedback capacitor current control method for the isolated buck-boost converter is proposed to solve the instability problem caused by the resonance spike of the LC filter. Five kV/50 kW SiC-based dc–dc modules and ±10 kV/200 kW PV MVDC converters were developed. Experiments of the converter for MVDC system in the normal and LVRT conditions are presented. The experimental results verify the effectiveness of the proposed topology and control strategy.

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