Study on control strategy of large-scale renewable energy connect to LCC-HVDC system

2021 ◽  
Author(s):  
L. Yan ◽  
L. Hongzhi ◽  
T. Xinshou ◽  
W. Zhibing
Keyword(s):  
Renewable Energy ◽  
Control Strategy ◽  
Large Scale ◽  
Hvdc System

scholarly journals Electromechanical Transient Modeling and Control Strategy of Decentralized Hybrid HVDC Systems

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2856
Author(s):  
Guoteng Wang ◽  
Huangqing Xiao ◽  
Liang Xiao ◽  
Zheren Zhang ◽  
Zheng Xu
Keyword(s):  
New England ◽  
Control Strategy ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Large Scale ◽  
Simulation Software ◽  
Transient Model ◽  
Modeling And Control ◽  
Hvdc System ◽  
And Control

This paper studies the electromechanical transient model and the control strategy of line commutated converter (LCC) and modular multilevel converter (MMC) based decentralized hybrid High Voltage Direct Current (HVDC) Transmission systems. The decentralized hybrid HVDC system is a new type of topology, and the related electromechanical transient model and control strategy have not been studied well. In this paper, the electromechanical transient model of a decentralized hybrid HVDC system is devloped through mathematical deduction. This model can be easily implemented in electromechanical transient simulation software and meet the time domain simulation requirements of large-scale systems. Then, in order to ensure the safe absorption of the DC power under various conditions, an optimal power flow model considering the decentralized hybrid HVDC system is proposed. Finally, the electromechanical transient model proposed in this paper is verified by the electromagnetic transient model, and the control strategy is validated in a modified New England 39-bus system.

scholarly journals An Improved Droop-Based Control Strategy for MT-HVDC Systems

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 87 ◽  
Author(s):  
Fazel Mohammadi ◽  
Gholam-Abbas Nazri ◽  
Mehrdad Saif
Keyword(s):  
Control Strategy ◽  
Large Scale ◽  
Reactive Power ◽  
Control Method ◽  
Power Sharing ◽  
Frequency Regulation ◽  
Dc Voltage ◽  
Hvdc System ◽  
Active And Reactive Power ◽  
Simulation Results

This paper presents an improved droop-based control strategy for the active and reactive power-sharing on the large-scale Multi-Terminal High Voltage Direct Current (MT-HVDC) systems. As droop parameters enforce the stability of the DC grid, and allow the MT-HVDC systems to participate in the AC voltage and frequency regulation of the different AC systems interconnected by the DC grids, a communication-free control method to optimally select the droop parameters, consisting of AC voltage-droop, DC voltage-droop, and frequency-droop parameters, is investigated to balance the power in MT-HVDC systems and minimize AC voltage, DC voltage, and frequency deviations. A five-terminal Voltage-Sourced Converter (VSC)-HVDC system is modeled and analyzed in EMTDC/PSCAD and MATLAB software. Different scenarios are investigated to check the performance of the proposed droop-based control strategy. The simulation results show that the proposed droop-based control strategy is capable of sharing the active and reactive power, as well as regulating the AC voltage, DC voltage, and frequency of AC/DC grids in case of sudden changes, without the need for communication infrastructure. The simulation results confirm the robustness and effectiveness of the proposed droop-based control strategy.

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