Evaluation of Short Circuit Currents in Networks with Low Voltage Ride Through (LVRT) Enabled Voltage Source Converters (VSC) based Wind Turbines

2018 ◽  
Author(s):  
P.V.Praveen Gautam ◽  
Francis.C. Joseph
Keyword(s):  
Wind Turbines ◽  
Low Voltage ◽  
Short Circuit ◽  
Voltage Source ◽  
Voltage Source Converters ◽  
Low Voltage Ride Through ◽  
Short Circuit Currents

The Low Voltage Ride through Simulation Analysis for Wind Turbines to Grid

2012 ◽  
Vol 608-609 ◽  
pp. 687-691
Author(s):  
Ze Xin Zhang ◽  
Guang Qing Bao
Keyword(s):  
Wind Turbines ◽  
Low Voltage ◽  
Simulation Software ◽  
Voltage Source ◽  
Grid Voltage ◽  
Low Voltage Ride Through ◽  
Voltage Dip ◽  
Three Phase ◽  
Technical Specifications ◽  
Voltage Recovery

According to the provisions of low voltage ride through capability of wind turbines in the “large-scale design and technical specifications for wind farm to grid” of china, proposed a method to simulate this low voltage ride through grid voltage by computer simulation software. The simulation method is mainly used to simulate whether the wind turbines grid can meet the low voltage ride through requirements. In order to obtain the required grid voltage, the fault simulation circuit is divided into voltage dip part and voltage recovery part, which were used to simulated 20% & 90% voltage dip and the 20% grid voltage gradually recovered to 90% grid voltage. Three-phase fault modules for the voltage dip part, Three-phase programmable voltage source module for the voltage recovery part. The simulation results show that simulation system we build can simulate the required grid voltage.

scholarly journals Low-Voltage Ride-Through of the Novel Voltage Source-Controlled PMSG-Based Wind Turbine Based on Switching the Virtual Resistor

2021 ◽  
Vol 11 (13) ◽  
pp. 6204
Author(s):  
Shun Sang ◽  
Binhui Pei ◽  
Jiejie Huang ◽  
Lei Zhang ◽  
Xiaocen Xue
Keyword(s):  
Energy Storage ◽  
Wind Turbine ◽  
Control Strategy ◽  
Low Voltage ◽  
Short Circuit ◽  
Voltage Source ◽  
Stable Operation ◽  
Storage Battery ◽  
Low Voltage Ride Through ◽  
Short Circuit Fault

Voltage source (VS) control based on inertia synchronization is a novel phase lock loop (PLL)-less autonomous grid-synchronization control strategy suitable for the permanent magnet synchronous generator (PMSG)-based wind turbine. It can autonomously sense grid frequency fluctuations by adopting the dynamics of DC-link capacitor, and it has the advantage of stable operation in an extremely weak grid. This paper further studies the low-voltage ride-through (LVRT) of the PMSG-based wind turbine under the VS control, and presents a wind turbine structure with the additional energy storage battery on the DC side, which not only improves its LVRT capability but also enables the wind turbine to participate in the grid primary frequency regulation. The transient characteristics of VS-controlled wind turbines after the occurrence of the short-circuit fault are analyzed, and a current suppression strategy via switching the virtual resistor in the control loop of the grid-side converter (GCS) is presented. Through coordination with the energy storage battery, the LVRT of the PMSG-based wind turbine is realized, which has the advantage of withstanding a long-time short-circuit fault. Finally, based on the PSCAD/EMTDC simulation platform, the feasibility of the control strategy and the correctness of the theoretical analysis are verified.

Low Voltage Ride Through of Voltage Source Converters With Droop Control

2021 ◽  
Author(s):  
Xing Zhang ◽  
Jilei Wang ◽  
Zixuan Guo ◽  
Feng Han ◽  
Xinxin Fu ◽  
...  
Keyword(s):  
Low Voltage ◽  
Voltage Source ◽  
Droop Control ◽  
Voltage Source Converters ◽  
Low Voltage Ride Through

scholarly journals Thyristor Arc Eliminator for Protection of Low Voltage Electrical Equipment

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2749 ◽  
Author(s):  
Karol Nowak ◽  
Jerzy Janiszewski ◽  
Grzegorz Dombek
Keyword(s):  
Lower Cost ◽  
Low Voltage ◽  
Short Circuit ◽  
Electrical Equipment ◽  
Power Network ◽  
System Operation ◽  
Test Circuit ◽  
Wide Range ◽  
Short Circuit Currents ◽  
Electrical Apparatus

The paper presents the layout of two opposing thyristors working as an Arc Eliminator (AE). The presented solution makes it possible to protect an electrical apparatus against the effects of an arcing fault. An Arc Eliminator is assumed to be a device cooperating with the protected apparatus. Thyristors were used because of their speed of operation and a relatively lower cost compared to other semiconductors with the same current-carrying capacity. The proposed solution, as one of the few currently available, makes it possible to eliminate the fault arc—both at short-circuit currents and current values to which overcurrent protections do not react. A test circuit was designed and made to study the effectiveness of the thyristor arc eliminator. A series of tests was carried out with variable impedance in the arc branch, including the influence of circuit inductance on arc time. It was found that the thyristor arc eliminator effectively protects devices powered from a low voltage power network against the effects of a fault or arc fault. The correctness of system operation for a wide range of impedance changes in the circuit feeding the arc location was demonstrated.

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