The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
For hardware design, RC filter, voltage sensitive resistor and photoelectric isolation method are used to eliminate interference signal in sampling channel and A/D channel.
在硬件方面，采用RC滤波器、压敏电阻、光电隔离等措施，消除了采样通道及A/D通道的干扰信号；
The input and output of the ceramic filter are tied together. The filter's center terminal (normally grounded) is connected to the current limiting resistor.
陶瓷滤波器的输入端和输出端被接到了一起，而它的中心端（正常使用时经常接地）连接到限流电阻。
Since the damping resistor used in the passive damping control algorithm is omitted, the problems of filter performance degradation and system efficiency degradation are avoided.
因省去了以往无源阻尼控制算法中用以抑制系统谐振而增加的阻尼电阻，而从根源上消除了滤波器滤波性能、系统效率降低和发热等问题。
To suppress resonance 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。通过对滤波电容电流的积分处理，改变了系统传递函数的极点，确保了系统的稳定运行。
To suppress resonance 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。通过对滤波电容电流的积分处理，改变了系统传递函数的极点，确保了系统的稳定运行。
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