Improvement of Transient Voltage Stability of the Wind Farm Using SVC

2012 ◽  
Vol 608-609 ◽  
pp. 653-657 ◽  
Author(s):  
Yong Bin Zhao ◽  
Jun Yang ◽  
Qiu Ye Sun ◽  
Xu Huang
Keyword(s):  
Control Strategy ◽  
Voltage Stability ◽  
Wind Farm ◽  
Transient Stability ◽  
Control Performance ◽  
Transient Voltage Stability ◽  
Orientation Vector ◽  
Wind Power System ◽  
Transient Voltage ◽  
The Stability

Static var compensator (SVC) is used to improve transient voltage stability of the asynchronous wind farm. The issue of voltage stability and transient stability of wind power system are also addressed. A novel control strategy of SVC is proposed instead of the types of traditional feedforward and uniline feedback to control SVC. The proposed method makes control performance better and the compensation efficiency higher. At the same time, balanced compensation strategy of orientation vector conversion is applied instead of traditional model of steady-state phasor to calculate the compensation electrical susceptance. Using this method can overcome the shortcoming of dynamic characteristics and adaptability. At last, the simulation results indicate this control strategy could improve the stability of wind farm effectively and quickly.

A Control Strategy for Transient Stability Improvement of Doubly-Fed Wind Power Generation System

2014 ◽  
Vol 953-954 ◽  
pp. 337-341
Author(s):  
Chao Xu ◽  
Jin Ling Lu ◽  
Jin Long Zhou
Keyword(s):  
Control Strategy ◽  
Wind Farm ◽  
Transient Stability ◽  
Reactive Power ◽  
System Stability ◽  
Control Loop ◽  
Reactive Control ◽  
Voltage Control Strategy ◽  
Transient Voltage ◽  
Doubly Fed

A novel inverter control strategy to enhance the transient stability of grid-connected wind farm based on doubly-fed induction generator (DFIG) is presented. Adding transient angle control strategy in the rotor side converter active control loop, this can dissipate the system unbalancing energy and restrain the system oscillations by the variation of wind turbine speed. Adding transient voltage control strategy in reactive control loop, this can provide fast reactive power compensation and support the restoration and reconstruction of the grid voltage when fault occurred. The control strategy which can improve the transient Angle stability and transient voltage stability at the same time is put forward. Finally, a testing system including a DFIG-based wind farm is realized using DigSILENT/Power Factory, the strategy validation and the contribution to power system stability enhancement are verified by simulation.

scholarly journals Research on Applicability of the Practical Transient Voltage Stability Criterion Based on Voltage Magnitude and Sag Duration

2021 ◽  
Vol 11 (10) ◽  
pp. 4569
Author(s):  
Guoteng Wang ◽  
Zheng Xu ◽  
Zheren Zhang
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Stability Boundary ◽  
Theoretical Derivation ◽  
System A ◽  
Transient Voltage Stability ◽  
Practical Engineering ◽  
Transient Voltage ◽  
The Stability ◽  
Application Scope

Voltage sags threaten the transient voltage stability of power systems. To evaluate the transient voltage stability, practical criteria based on voltage magnitude and sag duration are widely used in practical engineering. However, the applicability of practical criteria needs to be studied. In this paper, in a single-load system, a theoretical derivation was first made to obtain the transient voltage stability boundary. Then, by studying the relationship between the practical criteria and the stability boundary, the application scope of the practical criteria was determined. The application scope described in this paper can guide operators to use the practical criteria correctly and avoid misjudgment of the transient voltage stability as much as possible. Finally, a case study based on PSCAD/EMTDC is presented, and the simulation results verified the conclusions proposed in this paper.

Control Strategy of Improving the Transient Voltage Stability of Grid-Connected Large-Scale Wind Farm

2013 ◽  
Vol 448-453 ◽  
pp. 1758-1761
Author(s):  
Jin Ling Lu ◽  
Shao Tong Shi ◽  
Yang Lu
Keyword(s):  
Control Strategy ◽  
Voltage Stability ◽  
Reactive Power ◽  
Wind Farms ◽  
Power Converter ◽  
Control Model ◽  
Pitch Control ◽  
Transient Voltage Stability ◽  
Transient Voltage ◽  
Voltage Support

Because mostly used variable speed wind turbines based on doubly fed induction generator (DFIG) do not provide with transient voltage support capability under fault conditions, the security and stability of grid is influenced by wind farms integration in the case of severe short circuit fault contingency occurred on the grid side. The modified power converter controller model with transient voltage support capability and pitch control model used for post-fault stability control are implemented in DIgSILENT/PowerFactory. The models validation and the contribution to transient voltage stability enhancement are verified by power system simulation containing large wind farms. From simulation results, it can be illustrated that modified power converter controller with transient voltage support capability can provide dynamic reactive power to support grid voltage recovery and the modified pitch control model can reduce mechanical power , preventing wind turbines from over-speeding and also providing more reactive power generation stability for the power converter controller in the duration of power system large disturbance. The conclusion is presented that the control strategy can effectively improve the transient voltage stability of the gird.

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