Any subtle change of capacitance can be measured through the method of modulation on high - frequency harmonic oscillation return circuit 电容的微小变化可通过对高频谐振回路调制的方法进行测量。
The first natural frequency map in working space was drawn , which can be useful for selecting proper working position to avoid resonance or low - order harmonic oscillation 讨论了频率求解精度、收敛性与单元横向弹性位移型函数以及单元数量之间的关系。
Analysis and tests show that by using slope compensation , the open - loop instability , sub - harmonic oscillation , non - ideal closed - loop response and noise etc . when duly cycle above 50 % , can be reduced or eliminated 理论分析与试验表明,通过引入斜坡补偿可以抑制或消除占空比超过5 %时的开环不稳定性、次谐波振荡倾向、不理想的闭环响应、噪声等。
It can make the analysis report on the basis of the abstract nation standard . based practical analog analysis in some partial power net , obtain the harmonic oscillation characteristic curve , and verify the software is right 通过对某局域电网的实例仿真分析,结果表明,获得了谐波谐振特性曲线,还根据实际测试数据,恢复了电网实际电压电流波形,验证了软件的正确性。
It can reduce the harmonic or harmonic oscillation in public power net to take some effective measures by making use of this software , and finally reduce the power system accidents and cease time , improve power quality . it is wide application in the future 应用该软件的分析结果采取有效防范措施,可以预防或减少谐波源进入公用电网,减少或降低谐波谐振,进而减少电力事故和停电时间,提高电能质量,应用前景十分广阔。
But , the measured - data is a very great quantity and every data contain all data of 1 - 25 harmonic , measured time can have hours to days . the count by hand is very heavy and over - elaborate , sometimes the statistics results is error . it won " t reach the analysis purpose and don " t obtain the curve of harmonic oscillation characteristic in a row frequency range 可是,测试数据经常是大量的,每一组数据又包含从基波到25次谐波的所有数据,测试时间可能是几个小时,有的甚至是几天时间,这样的工作量由人工完成是非常繁重的,又是非常繁琐的,有时还统计不出正确的数值,起不到应有的测试分析目的,更无法获得连续频域内的谐波谐振特性曲线。
This paper makes a science analysis to power system " s harmonics and harmonic oscillation in partial power net , develop the analysis software of harmonic oscillation characteristic . make use of this software can obtain the harmonic oscillation characteristic curve in a row frequency range , can discover accurately oscillation , can make an in - depth analysis and statistics and renew the realistic curve of voltage or current on the basis of the measured - data 本文通过对电力系统谐波及局域电网谐波谐振现象的理论分析,设计、开发了局域电网谐波谐振特性分析软件,利用该软件可以获取连续频域内的谐波谐振特性曲线,发现准谐振区域,而且还能根据实际测试数据,正确统计分析出所要求的参数,同时能够恢复电网实际的电压、电流波形,并能根据国家标准自动生成分析报告。