The phase-locking process is studied for high-power gyrotron oscillator driven by an external signal. The phase-locking nonlinear differential equations are derived, and the condition of phase-locking is shown and ana...The phase-locking process is studied for high-power gyrotron oscillator driven by an external signal. The phase-locking nonlinear differential equations are derived, and the condition of phase-locking is shown and analyzed. The phase-locking signal can be introduced after gyrotron oscillates into saturation or before it. Two different ways of inputting signal make markable influence on the phase-locking process, this phenomenon is discussed. In this paper, the numerical calculations and analysis are given for gyrotron TE13 mode.展开更多
为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器（power system stabilizer,PSS）,阻尼电力系统局...为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器（power system stabilizer,PSS）,阻尼电力系统局部模振荡。第2个实例是就地补偿设计附加在静态同步补偿器（static synchronous compensator,STATCOM）上的稳定器,抑制多机电力系统中的区域模振荡,并给出在一个16机电力系统中的应用计算和仿真结果。展开更多
This paper presents a high-Q RF MEMS oscillator consisting of a micro-disk resonator and low noise feedback circuits. The oscillator has high frequency stability and low phase noise. The two-port resonator was hermeti...This paper presents a high-Q RF MEMS oscillator consisting of a micro-disk resonator and low noise feedback circuits. The oscillator has high frequency stability and low phase noise. The two-port resonator was hermetically encapsulated using low-cost Sn-rich Au-Sn solder bonding, which significantly improves the frequency stability. A low noise oscillator circuit was designed with a two-stage amplifying architecture which effectively improves both the frequency stability and phase noise performance. The measured phase noise is -96 dBc/Hz at 1 kHz offset and-128 dBc/Hz at far-from-carrier offsets. Moreover, the medium-term frequency stability and Allan deviation of the oscillator are 4-4 ppm and 10 ppb, respectively. The oscillator is a promising component in future wireless communication application.展开更多
电力系统稳定器(power system stabilizer,PSS)是抑制低频振荡的重要手段,但现有PSS模型在很宽频带范围运行时,在幅频特性和相频特性上有时存在不协调的问题,需加以解决。提出一种分段补偿的两分支并行PSS模型,在现有PSS模型超前滞后环...电力系统稳定器(power system stabilizer,PSS)是抑制低频振荡的重要手段,但现有PSS模型在很宽频带范围运行时,在幅频特性和相频特性上有时存在不协调的问题,需加以解决。提出一种分段补偿的两分支并行PSS模型,在现有PSS模型超前滞后环节上串入一个变增益环节来改善高频段的幅频特性,增加一个与原超前滞后环节并行的分支来改善PSS低频段的相位补偿能力。分析对比两分支并行PSS模型与现有PSS模型的频率特性。应用电力系统分析综合程序(power system analysis software package,PSASP),在一个实际大型电力系统中对两分支并行PSS的应用效果进行了仿真验证,效果良好。研究表明两分支PSS模型比现有PSS模型具有更好的适应性。展开更多
文摘The phase-locking process is studied for high-power gyrotron oscillator driven by an external signal. The phase-locking nonlinear differential equations are derived, and the condition of phase-locking is shown and analyzed. The phase-locking signal can be introduced after gyrotron oscillates into saturation or before it. Two different ways of inputting signal make markable influence on the phase-locking process, this phenomenon is discussed. In this paper, the numerical calculations and analysis are given for gyrotron TE13 mode.
文摘为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器（power system stabilizer,PSS）,阻尼电力系统局部模振荡。第2个实例是就地补偿设计附加在静态同步补偿器（static synchronous compensator,STATCOM）上的稳定器,抑制多机电力系统中的区域模振荡,并给出在一个16机电力系统中的应用计算和仿真结果。
基金Project supported by the National Natural Science Foundation of China(Nos.61234007,61404136)the State Key Development Program for Basic Research of China(Nos.2011CB933102,2013YQ16055103)
文摘This paper presents a high-Q RF MEMS oscillator consisting of a micro-disk resonator and low noise feedback circuits. The oscillator has high frequency stability and low phase noise. The two-port resonator was hermetically encapsulated using low-cost Sn-rich Au-Sn solder bonding, which significantly improves the frequency stability. A low noise oscillator circuit was designed with a two-stage amplifying architecture which effectively improves both the frequency stability and phase noise performance. The measured phase noise is -96 dBc/Hz at 1 kHz offset and-128 dBc/Hz at far-from-carrier offsets. Moreover, the medium-term frequency stability and Allan deviation of the oscillator are 4-4 ppm and 10 ppb, respectively. The oscillator is a promising component in future wireless communication application.
文摘电力系统稳定器(power system stabilizer,PSS)是抑制低频振荡的重要手段,但现有PSS模型在很宽频带范围运行时,在幅频特性和相频特性上有时存在不协调的问题,需加以解决。提出一种分段补偿的两分支并行PSS模型,在现有PSS模型超前滞后环节上串入一个变增益环节来改善高频段的幅频特性,增加一个与原超前滞后环节并行的分支来改善PSS低频段的相位补偿能力。分析对比两分支并行PSS模型与现有PSS模型的频率特性。应用电力系统分析综合程序(power system analysis software package,PSASP),在一个实际大型电力系统中对两分支并行PSS的应用效果进行了仿真验证,效果良好。研究表明两分支PSS模型比现有PSS模型具有更好的适应性。
