一种先进的APF补偿电流自适应检测法

针对有源电力滤波器(APF)设计过程中,在检测谐波电流时要满足实时性强和精确度高的要求,在传统自适应检测方法的基础上,提出了一种先进的三相APF系统补偿电流自适应检测方法。该方法结合了空间矢量变换与自适应干扰对消的原理,克服了传统自适应检测方法存在的固有局限性,具有较强的自适应性,在系统电流严重畸变时,能实时高精度地检测出三相系统中的各相谐波分量,同时可检测出基波正、负序分量。文中详细分析了检测电路的频率特性,该检测电路采用锁相环产生参考电压和在积分器前串接低通滤波器,并通过广义矢量变换矩阵取代传统变换矩阵的方法,大大提高了系统检测精度和动态响应特性。该方法同样适应于电压各分量的检测。实验结果证明了该检测方法的正确性和优越性。

An Advanced Adaptive Detecting Method of Current Compensation to Active Power Filters

In order to meet the stronger real-time and higher precision requirement of active power filter harmonic current detecting,an advanced adaptive harmonic detecting method is proposed.Based on the concept of space vector and the the-ory of adaptive interference cancelation,this method has stronger adaptability,which overcomes the inherent limitations of the traditional adaptive detecting methods.And stronger real-time and higher precision detection for the fundamental posi-tive sequence component,fundamental negative sequence component and harmonic component is proposed,when the sys-tem current is seriously distorted.The frequency characteristics of the detecting circuit are analyzed in detail.Meanwhile,the accuracy and dynamic response characteristics of the system are greatly enhanced by usage of the PLL generated ref-erence voltage and with an integrator in series before the low-pass filter in the system and with the method of traditional transformational matrix replaced by generalized vector transformational matrix.The amount of voltage detection is also applied to this method.The correctness and superiority of this detecting method have proved in the experimental results.