摘要
分析了谐振滤波器的电路模型,即RLC串联电路的检测性能。将畸变的电流转换为电压并将该电压信号作为RLC串联电路(其谐振频率为电流的基波频率)的输入信号,则在电容C上将获得放大的基波电压信号以及被有效抑制的谐波分量,从而实现对基波电流的检测。分析了电路品质因数Q对RLC串联电路检测性能的影响,推导了检测电路的传递函数,并设计了相应的二阶串联谐振数字滤波器。该方法具有实现简单、运算量小等优点,适用于三相及单相电路有源电力滤波器(APF)的基波电流检测,以及动态电压恢复器中基波电压的检测。仿真及实验结果验证了所提方法的有效性。
The detecting performance of resonant filter circuit model,RLC series circuit,is analyzed. The voltage,transformed from distorted current,is input into the RLC series circuit and the amplified fundamental component and sharply attenuated harmonics appear on the capacitor,by which the fundamental component of the distorted current is detected. The influence of quality factor Q on the detection precision is analyzed ,and the transfer function of detection circuit is derived ,which leads to the design of corresponding 2nd serial resonant filter. With the advantages of easy implementation and less calculation, the method is suitable for the fundamental current detection in three- phase or single-phase APF（Active Power Filter）,as well as the fundamental voltage detection in DVR（Dynamic Voltage Restorer）. The results of simulation and experiment confirm its validity.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第9期58-61,共4页
Electric Power Automation Equipment
