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基于坐标旋转虚拟阻抗的微电网控制与性能分析 被引量:17
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作者 王瑞琪 程艳 +3 位作者 孙树敏 靳占新 李宝贤 李超英 《电力系统保护与控制》 EI CSCD 北大核心 2014年第12期78-86,共9页
微电网中系统阻抗不平衡和复阻抗特性、电源和负载位置复杂性等因素严重影响了系统功率分配的准确性、稳定性和动态性能。提出了基于坐标旋转虚拟阻抗的孤岛微电网控制策略,采用坐标旋转虚拟阻抗闭环改善微电网的阻抗特性,基于电压幅值... 微电网中系统阻抗不平衡和复阻抗特性、电源和负载位置复杂性等因素严重影响了系统功率分配的准确性、稳定性和动态性能。提出了基于坐标旋转虚拟阻抗的孤岛微电网控制策略,采用坐标旋转虚拟阻抗闭环改善微电网的阻抗特性,基于电压幅值和频率下垂控制实现系统功率分配,带前馈补偿的电压外环控制和电流内环控制保证了系统的稳态和暂态性能。建立了完整的微电网小信号动态模型,并在此基础上分析了坐标旋转虚拟阻抗对整个微电网性能的影响。算例仿真验证了小信号动态建模分析的准确性,证明了该方法能够改进功率解耦和分配的准确性,提高微电网控制的稳定性和动态性能。 展开更多
关键词 微电网 虚拟阻抗 小信号模型 坐标旋转 下垂控制
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全绝缘自支撑电缆系统设计(英文) 被引量:1
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作者 George G.Karady Kumaraguru Prabakar 《高电压技术》 EI CAS CSCD 北大核心 2011年第11期2715-2720,共6页
All-dielectric self-supporting(ADSS) cables are installed along with transmission line for the purpose of communication.During installation the outer layer of the cable is hydrophobic and is not prone to dry band arci... All-dielectric self-supporting(ADSS) cables are installed along with transmission line for the purpose of communication.During installation the outer layer of the cable is hydrophobic and is not prone to dry band arcing. These cables become less hydrophobic over time and become vulnerable to dry band arcing.This loss in hydrophobicity is because of the contamination formed on the outer layer due to pollution.This is one of the reasons which cause cable failure.Considerable amount of losses will be incurred on the occurrence of a cable failure as the cables are also leased to other companies.An improved equivalent circuit is used to calculate the voltage and current distribution of the double circuit line.A three-phase single circuit line and a three-phase double circuit line are used to calculate their corresponding voltage distribution and current distribution.The results could be used to predict dry band arcing on similar models.The method used considers sag,span and pollution on ADSS cable. 展开更多
关键词 dry band arcing all-dielectric self-supporting cable fiber optic cable voltage distribution current distribution all-dielectric self-supporting circuit simulation
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