scholarly journals Coordinated Control Strategies for Offshore Wind Farm Integration via VSC-HVDC for System Frequency Support

2017 ◽  
Vol 32 (3) ◽  
pp. 843-856 ◽  
Author(s):  
Yujun Li ◽  
Zhao Xu ◽  
Jacob Ostergaard ◽  
David J. Hill
Keyword(s):  
Wind Farm ◽  
Control Strategies ◽  
Coordinated Control ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
System Frequency ◽  
Wind Farm Integration

scholarly journals Fault Ride Through Strategy for Offshore Wind Farm Integration System via MMC-HVDC

2018 ◽  
Vol 173 ◽  
pp. 03083
Author(s):  
Zhang Lijun ◽  
Zhong Yujun ◽  
Chen Rui ◽  
Sun Yikai ◽  
Zhang Jing ◽  
...  
Keyword(s):  
Wind Farm ◽  
Control Strategies ◽  
Fault Isolation ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Integration System ◽  
Fault Ride Through ◽  
Bus Voltage ◽  
Grid Side ◽  
Wind Farm Integration

When offshore wind power is transmitted to ac grid through MMC-HVDC, the current and voltage will be quite different from those in traditional ac grid during grid side fault. This paper sets up an offshore wind farm integration system via MMC-HVDC and designs control strategies for each unit in the system. The fault ride through strategy of the system is proposed and its effectiveness has been verified. Thus, the AC bus voltage on wind farm side will stay stable during AC side fault. Once the chopper resistance is set properly, the output power and current of the wind farm can basically remain unchanged, which can successfully achieve fault isolation. The simulation results based on PSCAD have verified the theoretical analysis.

scholarly journals Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2058
Author(s):  
Zheren Zhang ◽  
Yingjie Tang ◽  
Zheng Xu
Keyword(s):  
Wind Power ◽  
Computer Aided Design ◽  
Wind Farm ◽  
Offshore Platform ◽  
Offshore Wind ◽  
Operating Frequency ◽  
Offshore Wind Farm ◽  
Medium Frequency ◽  
Offshore Wind Power ◽  
System Frequency

Offshore wind power has great development potential, for which the key factors are reliable and economical wind farms and integration systems. This paper proposes a medium-frequency wind farm and MMC-HVDC integration system. In the proposed scheme, the operating frequency of the offshore wind farm and its power collection system is increased from the conventional 50/60 Hz rate to the medium-frequency range, i.e., 100–400 Hz; the offshore wind power is transmitted to the onshore grid via the modular multilevel converter-based high-voltage direct current transmission (MMC-HVDC). First, this paper explains the principles of the proposed scheme in terms of the system topology and control strategy aspects. Then, the impacts of increasing the offshore system operating frequency on the main parameters of the offshore station are discussed. As the frequency increases, it is shown that the actual value of the electrical equipment, such as the transformers, the arm inductors, and the SM capacitors of the rectifier MMC, can be reduced, which means smaller platforms are required for the step-up transformer station and the converter station. Then, the system operation characteristics are analyzed, with the results showing that the power losses in the system increase slightly with the increase of the offshore AC system frequency. Based on time domain simulation results from power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC), it is noted that the dynamic behavior of the system is not significantly affected with the increase of the offshore AC system frequency in most scenarios. In this way, the technical feasibility of the proposed offshore platform miniaturization technology is proven.

scholarly journals Research on hybrid multi-terminal high-voltage DC technology for offshore wind farm integration

2013 ◽  
Vol 1 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Peng Zhan ◽  
Chenghao Li ◽  
Jinyu Wen ◽  
Yu Hua ◽  
Meiqi Yao ◽  
...  
Keyword(s):  
High Voltage ◽  
Wind Farm ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Wind Farm Integration
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