With the analysis on the real part measurement in high frequency, a method of image resistivity well logging is put forward with multi-frequencies.
文章用矢量分析的方法,对复电阻率测井方法进行了分析,指出在主电流测量中,实部电流IX只与岩层电阻率有关,而虚部电流IY才与介质的介电常数有关;对高频实部测量的电阻率不具有频散特性进行了分析,并提出了多频虚电阻率测井方法。
In this paper,control methods based on damping resistor and virtual resistor are presented.
针对上述问题,提出了可以根据系统要求及成本因素,采用抑制谐振电阻或虚拟电阻的策略避免谐振,并对滤波参数计算及控制策略进行了分析,最后仿真结果证明了能够减小高次谐波并具有较好的稳定性。
To suppress reso- nance of LCL filter and improve stability of system,it is pre- sent that a voltage and current double loops control strategy based on virtual resistor concept.
为了提高系统的稳定性,抑制滤波器的谐振,在双闭环控制的基础上提出了一种基于虚拟电阻思想的控制策略。
In order to assure stable operation of system, in this paper a controlling strategy based on virtual resistor concept is presented to make controlling arithmetic replacing function of damping resistor.
但考虑到LCL滤波器存在谐振问题,如果控制策略不合适会导致系统不稳定,且增大输入电网电流的谐波畸变率,提出基于虚拟电阻思想的控制策略。