电网技术
電網技術
전망기술
Power System Technology
2015年
11期
3320-3326
,共7页
周蜜%樊亚东%郑钟楠%王建国%张宝全%李显强
週蜜%樊亞東%鄭鐘楠%王建國%張寶全%李顯彊
주밀%번아동%정종남%왕건국%장보전%리현강
海上风电机组%重力式基础%工频接地电阻%冲击接地电阻%潮间带
海上風電機組%重力式基礎%工頻接地電阻%遲擊接地電阻%潮間帶
해상풍전궤조%중력식기출%공빈접지전조%충격접지전조%조간대
offshore wind turbine%gravity foundation%power frequency grounding resistance%impulse grounding resistance%intertidal zone
为研究重力式基础海上风电机组接地特性,应用CDEGS仿真软件对重力式基础潮间带海上风电机组接地装置的工频特性参数和冲击特性参数进行了系统计算,讨论了海水深度、粘土层土壤电阻率及厚度、砂石层土壤电阻率以及基础结构尺寸参数对重力式基础工频接地电阻和冲击接地电阻的影响。结果表明:潮间带海水深度对潮间带海上风电机组重力式基础接地特性影响很大,在海水深度小于0.3 m时,潮间带海上风电机组重力式基础工频接地电阻和冲击接地电阻可能会超过规范允许值,随海水深度增加,工频接地电阻和冲击接地电阻迅速减小;工频接地电阻和冲击接地电阻随粘土层土壤电阻率、砂石层土壤电阻率增大而增大,随粘土层厚度增大而减小,但随着海水深度的加深,粘土层土壤电阻率、砂石层土壤电阻率、粘土层厚度对工频接地电阻和冲击接地电阻的影响逐渐减小;重力式基础的结构尺寸,如直径和埋深对接地电阻的影响有限。
為研究重力式基礎海上風電機組接地特性,應用CDEGS倣真軟件對重力式基礎潮間帶海上風電機組接地裝置的工頻特性參數和遲擊特性參數進行瞭繫統計算,討論瞭海水深度、粘土層土壤電阻率及厚度、砂石層土壤電阻率以及基礎結構呎吋參數對重力式基礎工頻接地電阻和遲擊接地電阻的影響。結果錶明:潮間帶海水深度對潮間帶海上風電機組重力式基礎接地特性影響很大,在海水深度小于0.3 m時,潮間帶海上風電機組重力式基礎工頻接地電阻和遲擊接地電阻可能會超過規範允許值,隨海水深度增加,工頻接地電阻和遲擊接地電阻迅速減小;工頻接地電阻和遲擊接地電阻隨粘土層土壤電阻率、砂石層土壤電阻率增大而增大,隨粘土層厚度增大而減小,但隨著海水深度的加深,粘土層土壤電阻率、砂石層土壤電阻率、粘土層厚度對工頻接地電阻和遲擊接地電阻的影響逐漸減小;重力式基礎的結構呎吋,如直徑和埋深對接地電阻的影響有限。
위연구중력식기출해상풍전궤조접지특성,응용CDEGS방진연건대중력식기출조간대해상풍전궤조접지장치적공빈특성삼수화충격특성삼수진행료계통계산,토론료해수심도、점토층토양전조솔급후도、사석층토양전조솔이급기출결구척촌삼수대중력식기출공빈접지전조화충격접지전조적영향。결과표명:조간대해수심도대조간대해상풍전궤조중력식기출접지특성영향흔대,재해수심도소우0.3 m시,조간대해상풍전궤조중력식기출공빈접지전조화충격접지전조가능회초과규범윤허치,수해수심도증가,공빈접지전조화충격접지전조신속감소;공빈접지전조화충격접지전조수점토층토양전조솔、사석층토양전조솔증대이증대,수점토층후도증대이감소,단수착해수심도적가심,점토층토양전조솔、사석층토양전조솔、점토층후도대공빈접지전조화충격접지전조적영향축점감소;중력식기출적결구척촌,여직경화매심대접지전조적영향유한。
Compared with onshore wind turbines, offshore wind turbine develops very quickly in recent years due to less land cover, higher wind speed and steady wind direction. At present, gravity foundations of offshore wind turbines are widely applied in Rudong intertidal wind farm in China. However, up to now, few attentions are paid to grounding of gravity foundations. In this paper, grounding resistance characteristics of gravity foundations of intertidal wind turbines were calculated and analyzed systematically. Various impact factors, including depth of seawater, resistivity and thickness of clay and gravel layers, and size and depth of pile pumped into ground, were considered. Analytical results show that grounding resistance is affected significantly by depth of seawater. If seawater depth is less than 0.3 m, power-frequency and impulse grounding resistances in intertidal zone of gravity foundation offshore turbine will, in some conditions, exceed limited value specified in standards. As seawater depth increases, both power-frequency and impulse grounding resistances decrease rapidly. Moreover, the two types of grounding resistances increase with increase of soil resistivity of clay and gravel layers, and decrease with increase of clay layer thickness, although these effects become weaker as depth of seawater increases. Structure size of gravity foundation, including its diameter and driven depth, has limited effect on resistances. These results are of great significance for grounding design of gravity foundations of offshore wind turbines.