气体绝缘变电站(gas-insulated substation,GIS)中隔离开关操作产生的瞬态电磁过程是影响智能组件正常工作的主要电磁干扰源,其在二次电缆的传导耦合和辐射耦合干扰分量大的大小研究较少。通过252 k V GIS真型实验平台模拟了变电站快速...气体绝缘变电站(gas-insulated substation,GIS)中隔离开关操作产生的瞬态电磁过程是影响智能组件正常工作的主要电磁干扰源,其在二次电缆的传导耦合和辐射耦合干扰分量大的大小研究较少。通过252 k V GIS真型实验平台模拟了变电站快速瞬态过电压(very fast transient overvoltage,VFTO)产生电磁干扰;测量了不同屏蔽措施条件下二次电缆两端干扰电压水平,得到了电缆端口干扰电压的时域和频域特性。通过统计分析发现辐射耦合是干扰电压产生的主要方式;因此为保证二次电缆安全稳定工作,变电站二次电缆应采取良好的屏蔽措施。展开更多
The purpose of this paper is to analyze the regional fault systems o f Qaidam basin and adjacent orogenic belts. Field investigation and seismic interp retation indicate that five regional fault systems occurred in t...The purpose of this paper is to analyze the regional fault systems o f Qaidam basin and adjacent orogenic belts. Field investigation and seismic interp retation indicate that five regional fault systems occurred in the Qaidam and ad jacent mountain belts, controlling the development and evolution of the Qaidam b asin. These fault systems are: (1)north Qaidam Qilian Mountain fault system; (2 ) south Qaidam East Kunlun Mountain fault system; (3)Altun strike slip fault s ystem; (4)Elashan strike slip fault system, and (5) Gansen Xiaochaidan fault s ystem. It is indicated that the fault systems controlled the orientation of the Qaidam basin, the formation and distribution of secondary faults within the basi n, the migration of depocenters and the distribution of hydrocarbon accumulation belt.展开更多
针对传统单级DC/DC变换器高降压变换困难的以及发电间歇问题及电网惯性不足的问题,文中提出了一种具有虚拟连轴电机特性的高降压比直流固态变压器(DC Electronic Power Transformer,DCEPT)控制方法。控制策略可在维持直流配网稳定的同...针对传统单级DC/DC变换器高降压变换困难的以及发电间歇问题及电网惯性不足的问题,文中提出了一种具有虚拟连轴电机特性的高降压比直流固态变压器(DC Electronic Power Transformer,DCEPT)控制方法。控制策略可在维持直流配网稳定的同时实现对上级高压电网的自主响应与功率支持。为直流并网接口提供惯性支持,有效实现对上级电网的惯性和阻尼支撑。拓扑具有降压比较高、负载响应速度快、具有较好的抗干扰能力。仿真结果验证了所提拓扑方法以及虚拟联轴控制策略的有效性。展开更多
文摘气体绝缘变电站(gas-insulated substation,GIS)中隔离开关操作产生的瞬态电磁过程是影响智能组件正常工作的主要电磁干扰源,其在二次电缆的传导耦合和辐射耦合干扰分量大的大小研究较少。通过252 k V GIS真型实验平台模拟了变电站快速瞬态过电压(very fast transient overvoltage,VFTO)产生电磁干扰;测量了不同屏蔽措施条件下二次电缆两端干扰电压水平,得到了电缆端口干扰电压的时域和频域特性。通过统计分析发现辐射耦合是干扰电压产生的主要方式;因此为保证二次电缆安全稳定工作,变电站二次电缆应采取良好的屏蔽措施。
文摘The purpose of this paper is to analyze the regional fault systems o f Qaidam basin and adjacent orogenic belts. Field investigation and seismic interp retation indicate that five regional fault systems occurred in the Qaidam and ad jacent mountain belts, controlling the development and evolution of the Qaidam b asin. These fault systems are: (1)north Qaidam Qilian Mountain fault system; (2 ) south Qaidam East Kunlun Mountain fault system; (3)Altun strike slip fault s ystem; (4)Elashan strike slip fault system, and (5) Gansen Xiaochaidan fault s ystem. It is indicated that the fault systems controlled the orientation of the Qaidam basin, the formation and distribution of secondary faults within the basi n, the migration of depocenters and the distribution of hydrocarbon accumulation belt.
文摘针对传统单级DC/DC变换器高降压变换困难的以及发电间歇问题及电网惯性不足的问题,文中提出了一种具有虚拟连轴电机特性的高降压比直流固态变压器(DC Electronic Power Transformer,DCEPT)控制方法。控制策略可在维持直流配网稳定的同时实现对上级高压电网的自主响应与功率支持。为直流并网接口提供惯性支持,有效实现对上级电网的惯性和阻尼支撑。拓扑具有降压比较高、负载响应速度快、具有较好的抗干扰能力。仿真结果验证了所提拓扑方法以及虚拟联轴控制策略的有效性。
