Taking the bending stiffness, static sag, and geometric non-linearity into consideration, the space nonlinear vibration partial differential equations were derived. The partical differential equations were discretized...Taking the bending stiffness, static sag, and geometric non-linearity into consideration, the space nonlinear vibration partial differential equations were derived. The partical differential equations were discretized in space by finite center difference approximation, then the nonlinear ordinal differential equations were obtained. A hybrid method involving the combination of the Newmark method and the pseudo-force strategy was proposed to analyze the nonlinear transient response of the inclined cable-dampers system subjected to arbitrary dynamic loading. As an example, two typical stay cables were calculated by the present method. The results reveal both the validity and the deficiency of the viscoelasticity damper for vibration control of stay cables. The efficiency and accuracy of the proposed method is also verified by comparing the results with those obtained by using Runge-Kutta direct integration technique. A new time history analysis method is provided for the research on the stay cable vibration control.展开更多
为充分利用构网控制的电压源特性,协同场站内多无功源进一步提升新能源场站对高比例新能源电力系统的暂态电压主动支撑能力,提出了基于构网变流器的新能源场站暂态电压分散协同控制策略,包括多无功源暂态电压控制改进策略和容量配置方...为充分利用构网控制的电压源特性,协同场站内多无功源进一步提升新能源场站对高比例新能源电力系统的暂态电压主动支撑能力,提出了基于构网变流器的新能源场站暂态电压分散协同控制策略,包括多无功源暂态电压控制改进策略和容量配置方法两方面。首先,对场站无功源的基本特性进行分析。然后,构网变流器增加了基于无功补偿的暂态控制,提高暂态内电势电压。跟网变流器和静止同步补偿器(static var generator, SVG)分别通过暂态有功/无功自适应变化控制策略、暂态参考值变化策略,增大两者的暂态无功出力。静止无功补偿器(static var compensator, SVC)采用暂稳态切换控制策略,由稳态的无功控制切换为电压控制,以进一步提高电压调节水平。同时基于最大暂态电流和补偿容量需求提出多无功源的容量配置方法。最后,构建弱电网下暂态电压主动支撑典型场景,验证了所提分散协同控制策略提高了场站的暂态电压支撑能力,挖掘了构网控制在场站主动暂态电压支撑方面的作用。展开更多
文摘Taking the bending stiffness, static sag, and geometric non-linearity into consideration, the space nonlinear vibration partial differential equations were derived. The partical differential equations were discretized in space by finite center difference approximation, then the nonlinear ordinal differential equations were obtained. A hybrid method involving the combination of the Newmark method and the pseudo-force strategy was proposed to analyze the nonlinear transient response of the inclined cable-dampers system subjected to arbitrary dynamic loading. As an example, two typical stay cables were calculated by the present method. The results reveal both the validity and the deficiency of the viscoelasticity damper for vibration control of stay cables. The efficiency and accuracy of the proposed method is also verified by comparing the results with those obtained by using Runge-Kutta direct integration technique. A new time history analysis method is provided for the research on the stay cable vibration control.
文摘为充分利用构网控制的电压源特性,协同场站内多无功源进一步提升新能源场站对高比例新能源电力系统的暂态电压主动支撑能力,提出了基于构网变流器的新能源场站暂态电压分散协同控制策略,包括多无功源暂态电压控制改进策略和容量配置方法两方面。首先,对场站无功源的基本特性进行分析。然后,构网变流器增加了基于无功补偿的暂态控制,提高暂态内电势电压。跟网变流器和静止同步补偿器(static var generator, SVG)分别通过暂态有功/无功自适应变化控制策略、暂态参考值变化策略,增大两者的暂态无功出力。静止无功补偿器(static var compensator, SVC)采用暂稳态切换控制策略,由稳态的无功控制切换为电压控制,以进一步提高电压调节水平。同时基于最大暂态电流和补偿容量需求提出多无功源的容量配置方法。最后,构建弱电网下暂态电压主动支撑典型场景,验证了所提分散协同控制策略提高了场站的暂态电压支撑能力,挖掘了构网控制在场站主动暂态电压支撑方面的作用。
