scholarly journals Modeling and Analysis of Transient Reactive Power Characteristics of DFIG Considering Crowbar Circuit under Ultra HVDC Commutation Failure

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2743
Author(s):  
Heng Nian ◽  
Xiao Jin
Keyword(s):  
Mathematical Model ◽  
Power Generation ◽  
Reactive Power ◽  
Effective Means ◽  
Long Distance ◽  
Selection Scheme ◽  
Practical Applications ◽  
Suppression Effect ◽  
Power Characteristics ◽  
Commutation Failure

Ultra high voltage direct current (UHVDC) transmission is an effective means of long-distance transmission of renewable power generation, which has obtained a lot of research and practical applications. The commutation failure is a common DC transmission fault, which will cause the voltage amplitude of the sending ac grid in UHVDC system to first decrease then increase. The existing transient mathematical models of the wind power generation system (WPGS) are difficult to apply to scenarios where the grid voltage changes continuously. A mathematical model suitable for commutation failure is established to analyze the transient reactive power characteristics of the doubly fed induction generator (DFIG)-based WPGS with the consideration of the crowbar circuit trigger. The correctness of the mathematical model is validated by an experiment based on the control hardware-in-loop (CHIL) platform. Based on the proposed mathematical model, the influence of the crowbar parameters on the reactive power output of the DFIG is analyzed, and the selection of crowbar parameters to suppress the overvoltage of the sending ac grid is investigated. A simulation model is built based on Matlab/Simulink to verify the overvoltage suppression effect of the proposed selection scheme.

scholarly journals Transient reactive power characteristics of HVDC during commutation failure and impact of HVDC control parameters

2017 ◽  
Vol 2017 (13) ◽  
pp. 1134-1139 ◽  
Author(s):  
Jingzhe Tu ◽  
Yan Pan ◽  
Jian Zhang ◽  
Bing Zeng ◽  
Junchuan Jia ◽  
...  
Keyword(s):  
Reactive Power ◽  
Control Parameters ◽  
Power Characteristics ◽  
Commutation Failure

scholarly journals Study on the total reactive compensation method of offshore wind farm

2018 ◽  
Vol 175 ◽  
pp. 03005
Author(s):  
Feng Peilei ◽  
Wu Hesong ◽  
Zhang Mingsheng ◽  
Wan Wenkni
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Large Scale ◽  
Reactive Power ◽  
Wind Farms ◽  
Offshore Wind ◽  
Long Distance ◽  
Offshore Wind Farms ◽  
Offshore Wind Power ◽  
Reactive Compensation

Wind power generation is one of the most mature and most developed conditions for power generation in new energy generation technology.Large capacity and long distance offshore wind power is the trend of future wind power development.Wind power generation is one of the most mature and commercialized power generation methods in the field of renewable energy utilization.Due to the rich characteristics of offshore wind resources and the urgent need for offshore wind power development projects all over the world, the transmission and interconnection of large-scale offshore wind farms has become a hot topic in the development and research of wind power.This paper focuses on the analysis of the reactive power compensation methods for offshore wind farms, and provides a reference for the construction of offshore wind farms.

scholarly journals A Novel Adaptive Control Approach Based on Available Headroom of the VSC-HVDC for Enhancement of the AC Voltage Stability

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3222
Author(s):  
Duc Nguyen Huu
Keyword(s):  
Adaptive Control ◽  
Voltage Stability ◽  
Reactive Power ◽  
Control Method ◽  
Offshore Wind ◽  
Voltage Source ◽  
Long Distance ◽  
Control Approach ◽  
Hvdc System ◽  
Voltage Support

Increasing offshore wind farms are rapidly installed and planned. However, this will pose a bottle neck challenge for long-distance transmission as well as inherent variation of their generating power outputs to the existing AC grid. VSC-HVDC links could be an effective and flexible method for this issue. With the growing use of voltage source converter high-voltage direct current (VSC-HVDC) technology, the hybrid VSC-HVDC and AC system will be a next-generation transmission network. This paper analyzes the contribution of the multi VSC-HVDC system on the AC voltage stability of the hybrid system. A key contribution of this research is proposing a novel adaptive control approach of the VSC-HVDC as a so-called dynamic reactive power booster to enhance the voltage stability of the AC system. The core idea is that the novel control system is automatically providing a reactive current based on dynamic frequency of the AC system to maximal AC voltage support. Based on the analysis, an adaptive control method applied to the multi VSC-HVDC system is proposed to realize maximum capacity of VSC for reactive power according to the change of the system frequency during severe faults of the AC grid. A representative hybrid AC-DC network based on Germany is developed. Detailed modeling of the hybrid AC-DC network and its proposed control is derived in PSCAD software. PSCAD simulation results and analysis verify the effective performance of this novel adaptive control of VSC-HVDC for voltage support. Thanks to this control scheme, the hybrid AC-DC network can avoid circumstances that lead to voltage instability.

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