High - q tuned lc filters will have more insertion loss 高q值调谐lc滤波器会有更多的插入损耗。
One is to simulate hysteresis loops of standard - sampel cores and assure that error amount is less than 20 percent , this process can support building a lib of inductors models in order that circuits ’ simulation can run successfully 最后,对不同磁芯的非线性性进行模拟,一般误差小于20 % ,以支撑实际电感模型库的建立,并验证所建磁芯电感宏模型。调用本文所建磁芯电感和相同电感量的理想电感进行lc滤波器仿真对比。
The pollution in power net is serious , the real - time harmonic compensation becomes more and more important . . the active power filters is a new harmonic and reactive power compensation equipment which was brought forward in 1970 s , compared with the traditional l - c filters the active poewer filters have the merits in rapid reflect 、 better compensation and the ability in dynamic compensation 有源电力滤波器是70年代提出的一种新型的谐波及无功动态补偿装置,与传统的无源lc滤波器相比较,具有响应快、补偿效果好和能够实现动态补偿的优点。本文介绍了有源电力滤波器的发展及其应用、分类及工作原理。
Accoridng to the target and preceding analyses , we select ad9850 for dds chip , pe3236 for pll chip , and mcu pic16f874 for loading control word and realizing control function . afterward , we design and simulate the lc filter , microstrip low - pass filter and coupler , then implement the frequency synthesis . finally , the circuit is tested and the target is obtained 根据指标的要求和上面的分析, dds芯片采用ad9850 , pll芯片采用pe3236 ,控制字的载入及控制功能的实现由单片机pic16f874来实现,并对其中的lc滤波器、微带低通滤波器、耦合器进行了设计和仿真,最后完成了一个频率合成器。
At last the components of the system are modeled and simulated with matlab software . the simulation results indicate that the combined system can reduce the capacity of apf effectively , detecting the harmonic current effectively , compensating harmonic current effectively 结果表明,对单位容量的谐波源,采用与可变参数lc滤波器混合使用的并联型有源电力滤波器系统,能够有效地减少有源滤波器的容量,有效地检测出高次谐波分量,并进行谐波补偿,使系统的电流波形基本保持正弦。
In the last few years , the polution and harm of harmonic hi the power system is becoming more and more serious . the lc passive filter that is used widely ca n ' t satisfy the new demands of harmonic filter . the combined system of shunt lc passive filter and active power filter are put forward , and this paper focus on the following four aspects . 1 近年来,电力系统谐波的污染和危害日趋严重,而国内普遍使用的lc无源滤波器逐渐不能适应滤波的新要求,本文提出了与可变参数lc滤波器混合使用的并联型有源电力滤波器系统,并着重研究了以下几个主要问题: 1 、 lc无源滤波器(主要是高通滤波器)参数调节对阻抗特性和无功补偿的影响。