高端换流变阀侧电压的持续运行最大峰值(peak value of the continuous operating voltage,PCOV)是特高压直流换流站直流避雷器参数设计和绝缘配合方案评估的一个重要数据。利用RTDS的非实时运算功能,本着尊重实际工程事实的原则及突出...高端换流变阀侧电压的持续运行最大峰值(peak value of the continuous operating voltage,PCOV)是特高压直流换流站直流避雷器参数设计和绝缘配合方案评估的一个重要数据。利用RTDS的非实时运算功能,本着尊重实际工程事实的原则及突出关键点、保留关联点和等效次要点的基本方式,通过采用自定义阀元件模型、低端换流器等效为可调直流源、控制系统依运行特性最简化等建模技术,建立了一种能够模拟换相过冲暂态过程、计算高端换流变阀侧电压PCOV的数字仿真高频模型,并且以向家坝—上海&800 k V直流输电工程为实例,从不同运行工况和不同设备参数的角度对模型准确性和可用性进行了分析和验证。展开更多
The geometric accuracy of topographic mapping with high-resolution remote sensing images is inevita-bly affected by the orbiter attitude jitter.Therefore,it is necessary to conduct preliminary research on the stereo m...The geometric accuracy of topographic mapping with high-resolution remote sensing images is inevita-bly affected by the orbiter attitude jitter.Therefore,it is necessary to conduct preliminary research on the stereo mapping camera equipped on lunar orbiter before launching.In this work,an imaging simulation method consid-ering the attitude jitter is presented.The impact analysis of different attitude jitter on terrain undulation is conduct-ed by simulating jitter at three attitude angles,respectively.The proposed simulation method is based on the rigor-ous sensor model,using the lunar digital elevation model(DEM)and orthoimage as reference data.The orbit and attitude of the lunar stereo mapping camera are simulated while considering the attitude jitter.Two-dimensional simulated stereo images are generated according to the position and attitude of the orbiter in a given orbit.Experi-mental analyses were conducted by the DEM with the simulated stereo image.The simulation imaging results demonstrate that the proposed method can ensure imaging efficiency without losing the accuracy of topographic mapping.The effect of attitude jitter on the stereo mapping accuracy of the simulated images was analyzed through a DEM comparison.展开更多
文摘高端换流变阀侧电压的持续运行最大峰值(peak value of the continuous operating voltage,PCOV)是特高压直流换流站直流避雷器参数设计和绝缘配合方案评估的一个重要数据。利用RTDS的非实时运算功能,本着尊重实际工程事实的原则及突出关键点、保留关联点和等效次要点的基本方式,通过采用自定义阀元件模型、低端换流器等效为可调直流源、控制系统依运行特性最简化等建模技术,建立了一种能够模拟换相过冲暂态过程、计算高端换流变阀侧电压PCOV的数字仿真高频模型,并且以向家坝—上海&800 k V直流输电工程为实例,从不同运行工况和不同设备参数的角度对模型准确性和可用性进行了分析和验证。
基金Supported by the National Natural Science Foundation of China(42221002,42171432)Shanghai Municipal Science and Technology Major Project(2021SHZDZX0100)the Fundamental Research Funds for the Central Universities.
文摘The geometric accuracy of topographic mapping with high-resolution remote sensing images is inevita-bly affected by the orbiter attitude jitter.Therefore,it is necessary to conduct preliminary research on the stereo mapping camera equipped on lunar orbiter before launching.In this work,an imaging simulation method consid-ering the attitude jitter is presented.The impact analysis of different attitude jitter on terrain undulation is conduct-ed by simulating jitter at three attitude angles,respectively.The proposed simulation method is based on the rigor-ous sensor model,using the lunar digital elevation model(DEM)and orthoimage as reference data.The orbit and attitude of the lunar stereo mapping camera are simulated while considering the attitude jitter.Two-dimensional simulated stereo images are generated according to the position and attitude of the orbiter in a given orbit.Experi-mental analyses were conducted by the DEM with the simulated stereo image.The simulation imaging results demonstrate that the proposed method can ensure imaging efficiency without losing the accuracy of topographic mapping.The effect of attitude jitter on the stereo mapping accuracy of the simulated images was analyzed through a DEM comparison.
