Transient Behavior Analysis of Offshore Wind Turbines During Lightning Strike to Multi-Blade

Tao, Shiqi; Zhang, Xiaoqing; Wang, Yaowu; Yang, Junfeng

doi:10.1109/access.2018.2828043

Cited by 25 publications

(12 citation statements)

References 13 publications

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“…The calculation of the contact resistance between the grounding electrode and the soil needs to be completed with four steps: firstly, placing the grounding electrode in the test box and filling in different soils, then connecting the test circuit; secondly using the four-electrode method to measure the soil resistivity; thirdly the soil resistance R a2 and the contact resistance R 21 between the aluminum plate and the soil were equivalently calculated based on the finite element method; finally, the grounding electrode was used as the current injection electrode, and the single-sided aluminum plate was used as the current return electrode. The contact resistance R 22 of per unit area between the grounding electrode and the soil can be calculated from equation 3to (6). The contact resistance of per unit area of the grounding electrode under different soil conditions is shown in Table 3.…”

Section: ) Measurement Methodsmentioning

confidence: 99%

“…(5) The conductive adhesive was used for coating the graphite evenly, tightly and integrally on the surface of the copper wire, which we call it graphite-coated copper wire. (6) Finally, the high current capability flexible graphite grounding material was woven with the graphite wire and graphite coated copper wire.…”

Section: Preparation Progress and Structurementioning

confidence: 99%

“…Most tropical countries, several southern states of the United States, several regions of Japan, China and Australia, experience heavy annual lightning occurrence density [3], [4]. With the continuous improvement of lightning protection technology, engineers and researchers had conducted in-depth research on the transient characteristic of lightning strike [5], [6]. According to the operation experiences, reliable grounding was one of the keys to lightning protection of the overhead transmission line.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

et al. 2019

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In order to meet the requirements of corrosion resistance of the grounding material and thermal stability of the grounding material of the transmission line towers, under the condition of power frequency current and high-frequency lightning current scattering into the ground in the case of short-circuit fault and lightning strikes, a kind of high-current capability flexible graphite grounding material was developed. The corrosion resistance of the flexible graphite grounding material and the steel type grounding material was compared by the soil simulation solution corrosion tests. The contact performance with different soils of the two materials was analyzed by the actual contact resistance measurement test. The thermal stability and the impulse current effective length of this grounding material were studied by means of simulation calculation. The results show that the high-current capability flexible graphite grounding material has a strong anticorrosion characteristic, whose reliable service life can exceed 30 years. Compared to the round steel grounding material, the contact resistance with the soil can be reduced by approximately 30%, and the impulse current effective length can be increased by about 30%. INDEX TERMS Flexible graphite grounding material, corrosion resistant characteristic, contact resistance, thermal stability, impulse current effective length.

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Section: ) Measurement Methodsmentioning

confidence: 99%

Section: Preparation Progress and Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

et al. 2019

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“…Hitherto, there is no related research that studies the impact of lightning strike to multi‐blade on lightning overvoltages and arresters configuration scheme on an offshore wind farm with multiple WTs. Although the transient overvoltages analysis of the lightning strike to multi‐blade in the offshore WT was carried out in [21], the influences of lightning strike to the multi‐blade on the transient overvoltages of the power cable and the arresters stresses of different WTs on offshore wind farm have not been taken into account.…”

Section: Introductionmentioning

confidence: 99%

The impact of lightning strike to multi‐blade on the lightning overvoltage and stresses of arresters in offshore wind farm

Zhang

Han

et al. 2021

IET Renewable Power Gen

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This paper establishes a complete lightning overvoltage simulation of an offshore wind farm, considering the electromagnetic effects including the blade, the tower and the power cable based on transmission-line theory. And the influences of grounding schemes of the power cable inside the tower, different WTs struck by lightning, lightning current amplitude and the number of blades struck by lightning on lightning overvoltages of WT are all analysed. The results demonstrate that the grounding of both ends can effectively suppress the lightning overvoltages of WT. Second, the lightning overvoltages of WTs are related to their connection modes in case of lightning strike to different WTs, because of the differences of the equivalent impedance at the outlet of the WTs. Furthermore, the lightning overvoltages of WTs caused by lightning strike to double blades are larger than that caused by lightning strike to a single blade. In the case of the lightning current with an amplitude of 200 kA striking double blades, arresters should adopt multiple parallels connection to ensure the equipment would not be damaged. The distance between the tower and the power cable should be maintained approximately 0.25 m, to prevent the damage to power cable caused by flashover.

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“…Offshore wind power has developed rapidly in recent years [1], [2] due to characteristics such as high utilization hours and high-level, stable output [3]- [5]. Compared with onshore wind power, offshore wind power generations (OWPGs) are more susceptible to extreme weather [6], [7] (e.g., typhoons), causing wind power rampdown events [8] and seriously threatening the safety and stability of power system operation.…”

Section: Introductionmentioning

confidence: 99%

An Ordered Curtailment Strategy for Offshore Wind Power Under Extreme Weather Conditions Considering the Resilience of the Grid

Wang

et al. 2019

IEEE Access

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Typhoon is an important factor leading to offshore wind power ramp events, which can easily cause a serious imbalance between the supply and the demand, thus affecting the security and stability of the power system operation. First, based on the actual typhoon path, this paper analyzes its impact on the output characteristics of offshore wind farms and proposes a framework to mitigate the impact of wind power ramping. On this basis, an ordered curtailment strategy for large-scale offshore wind power systems, considering the resilience of the grid, is proposed. With the goals of system safety, stability and operational economy, wind power ramp data are utilized to optimize the ordered curtailment of offshore wind power, considering wind power curtailment, the adjustment ability of generators and the demand response. The simulation analysis of the IEEE-RTS24 node system shows that the proposed strategy can reduce the operating cost of the system while ensuring its security and stability. INDEX TERMS Wind power ramping, security and stability of power system operation, grid resilience, ordered curtailment strategy for offshore wind power.

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Transient Behavior Analysis of Offshore Wind Turbines During Lightning Strike to Multi-Blade

Cited by 25 publications

References 13 publications

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

The impact of lightning strike to multi‐blade on the lightning overvoltage and stresses of arresters in offshore wind farm

An Ordered Curtailment Strategy for Offshore Wind Power Under Extreme Weather Conditions Considering the Resilience of the Grid

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