Feasibility of integrating large wind farm via fractional frequency transmission system a case study

Wang, Xifan; Teng, Yufei; Ning, Lipeng; Meng, Yongqing; Xu, Zhao

doi:10.1002/etep.1706

Cited by 16 publications

(9 citation statements)

References 13 publications

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“…Meanwhile, compared with the traditional power frequency transmission, on the premise of not increasing the voltage level, by reducing the frequency, it significantly reduces the charging current, releases the capacity occupied by the charging power, improves the active power transmission capacity, decreases the corresponding electrical distance from the system, and reduces the skin effect. Hence, the cable resistance is reduced and the current carrying capacity is increased [44][45][46][47][48].…”

Section: Scheme A-2: Low-frequency Ac Transmissionmentioning

confidence: 99%

Integration technology and practice for long‐distance offshore wind power in China

Pan¹,

Bo²,

Li³

et al. 2020

Energy Conversion and Economics

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Offshore wind power is an important kind of clean energy and of great development potential in the future. It has advantages of high wind speed and stable wind power, and gradually exhibits large‐scale, clustering, and long‐distance characteristics. Key technical problems of large‐capacity offshore wind power transmission over long distance must be solved in the development and utilization of offshore wind power, and will be addressed in this paper. First, this paper presents the overview of long‐distance offshore wind power integration in China, and then summarizes three types of integration schemes and its applicability. Second, it analyzes the characteristics of the voltage source converter based high voltage direct current (VSC‐HVDC) integration scheme and associated key technical problems in practice, and the first milestone long‐distance offshore wind power integration VSC‐HVDC project in China is then introduced. Finally, recommendations on long‐distance offshore wind power development in China are presented based on the characteristics of long‐distance offshore wind power and VSC‐HVDC integration technology.

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Section: Scheme A-2: Low-frequency Ac Transmissionmentioning

confidence: 99%

Integration technology and practice for long‐distance offshore wind power in China

Pan¹,

Bo²,

Li³

et al. 2020

Energy Conversion and Economics

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“…Except that the price of PMSG also depends on the price of the expensive rare earth magnets it needs. According to [10], the cost structure of a DFIG can be presented as Figure 2. The study indicates that when the DFIG operates at fractional frequency, the gearbox ratio can be decreased to one third, and the weight of the wind tower is also reduced.…”

Section: Cost Analysis For Offshore Wind Power Transmission Systemmentioning

confidence: 99%

Cost Analysis and Comparison between Modular Multilevel Converter (MMC) and Modular Multilevel Matrix Converter (M3C) for Offshore Wind Power Transmission

Luo¹,

Lin²,

Li³

et al. 2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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This paper focuses on the cost analysis of offshore wind power system using Modular Multilevel Converter (MMC) based HVDC or Modular Multilevel Matrix Converter (M 3 C) based fractional frequency transmission (FFT). Capital investment and long-term costs due to unavailability, Operation & Maintenance and power loss are analysed. The total cost is broken down into elements and those have larger impact on the overall cost are highlighted. Cost comparison between the two technologies is presented. Economical breakeven distance is analysed for schemes with different power ratings. In addition, sensitivity analysis is conducted considering discount rate, energy price, capacity factor, wind farm life time and wind turbine type to gain insight into the overall cost.

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“…Besides, when the number of offshore power plants and loads increases, multiterminal FFTS grid is easier to build than the multi-terminal HVDC grid [7,8]. And there has been some work done on evaluating the potential economic benefit of FFTS [8][9][10][11]. Generally, FFTS is more economical than HVDC when the offshore transmission distance is between 50 and 200 km [2].…”

Section: Introductionmentioning

confidence: 99%

Grid integration and fault ride‐through of fractional frequency offshore wind power system based on Y‐connected modular multilevel converter

Meng

Jia

et al. 2022

IET Generation Trans & Dist

Self Cite

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Fractional frequency transmission is a promising solution to offshore wind power integration. This paper proposes a new grid integration scheme of fractional frequency offshore wind power system (FFOWPS) based on Y-connected modular multilevel converter (Y-MMC). To get better power quality, a novel Y-MMC modelling and control method considering frequency leakage is presented. Besides, in order to achieve satisfactory fault ride-through (FRT) performance for FFOWPS, this paper proposes a novel FRT strategy. The strategy makes use of the onshore grid voltage and offshore grid frequency droop control to coordinately control the power of Y-MMC and wind turbines. This strategy achieves power balance on both sides of Y-MMC through coordinated control, thereby suppressing the increase of DC capacitor voltage during faults. It is also able to support the grid by injecting reactive power during voltage sags. Additionally, a new pitch angle control algorithm is designed to keep the balance between input mechanical power and output active power of wind turbines during FRT, avoiding the rapid rise of rotor speed. The simulation results in MATLAB/Simulink demonstrate good performance of FFOWPS during wind speed variations and validate the effectiveness of the proposed frequency leakage suppression strategy and FRT strategy.

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Feasibility of integrating large wind farm via fractional frequency transmission system a case study

Cited by 16 publications

References 13 publications

Integration technology and practice for long‐distance offshore wind power in China

Integration technology and practice for long‐distance offshore wind power in China

Cost Analysis and Comparison between Modular Multilevel Converter (MMC) and Modular Multilevel Matrix Converter (M3C) for Offshore Wind Power Transmission

Grid integration and fault ride‐through of fractional frequency offshore wind power system based on Y‐connected modular multilevel converter

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