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.

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.

Research on the Control Method of High Power APF for Oil Drilling Rig

2013 ◽  
Vol 734-737 ◽  
pp. 1450-1459
Author(s):  
Neng Qian Jiang ◽  
Ming Hua Zhu ◽  
Yi Feng Xie
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Electrical Equipment ◽  
Current Control ◽  
Harmonic Current ◽  
Oil Drilling ◽  
Drilling Rig ◽  
Harmonic Currents ◽  
Domain Transformation ◽  
And Control

The wide use of oil drilling rig brings nominated economic profits for oil drilling industry. However, it will bring about great quantities of harmonic current to the grid, lowering the power quality and reliability of the power grid. Meanwhile, harmonic currents will have a deteriorated influence to surrounding electrical equipment and grid. This paper studies the distribution characteristics of the harmonic current in the oil industry and puts forward a control strategy aiming for improving stability and reliability of the power supply system. This paper also proposes an algorithm for detecting harmonic current based on time domain transformation and control strategy based on two cascade (voltage and current) control loop. Experiment and simulation results validate the proposed control strategy.

Improved DC-Link Voltage Control for Double-Fed Induction Generator during Grid Fault

2012 ◽  
Vol 614-615 ◽  
pp. 1689-1692
Author(s):  
Dong Yan Xie ◽  
Yu Ping Wang ◽  
Li Wang
Keyword(s):  
Control Method ◽  
Low Voltage ◽  
Voltage Control ◽  
Current Control ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Matlab Software ◽  
Low Voltage Ride Through ◽  
Doubly Fed ◽  
Capability Improvement

Transient capability improvement of doubly fed induction generator (DFIG) during low voltage ride-through (LVRT) is important for both generator and grid safety. A theoretical current control method is introduced here to deal with LVRT of wind turbines with DFIG under symmetrical voltage dips. The objective is achieved by balancing the energy that flows in and out the DC-link capacitor. Simulations performed by Matlab software demonstrate the capabilities of the proposed method in enhancing the DFIG’s performance during low voltage ride-through.

Research on Practical Control Circuit of SVG in Single-Phase Low Voltage Field

2013 ◽  
Vol 694-697 ◽  
pp. 1469-1472
Author(s):  
Cong Mei Zha ◽  
Yan Dong
Keyword(s):  
Circuit Design ◽  
Control Strategy ◽  
Single Phase ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Current Control ◽  
Control Circuit ◽  
Voltage Source ◽  
Static Var Generator

For the use of Static Var Generator (SVG) in dynamic reactive power compensation of low voltage field, this paper proposes a reactive current control strategy suitable for single-phase bridge voltage source SVG and gives the main control circuit of this control method. The experimental results verify the effectiveness and practicality of this control strategy and the circuit design.

Study on an Advanced Low Voltage Ride-Through Control Strategy of Energy Router

2021 ◽  
Author(s):  
Xuefeng Qiao ◽  
Lei Chen ◽  
Jingguang Tang ◽  
Meng Ding ◽  
Zekai Zhao
Keyword(s):  
Control Strategy ◽  
Low Voltage ◽  
Low Voltage Ride Through
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