一种改进型FBD谐波及无功电流检测方法  

An improved harmonic and reactive current detection method based on FBD features

作　　者：张展[1] 杜诗扬 冷全超 刘亚晨 Zhang Zhan;Du Shiyang;Leng Quanchao;Liu Yachen(College of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学电气工程与自动化学院,焦作454003

出　　处：《电子测量技术》2021年第10期39-44,共6页Electronic Measurement Technology

基　　金：矿山电力电子装置与控制科研团队基金(CXTD2017085)项目资助。

摘　　要：基于FBD功率理论的谐波检测法因实现简单、稳定性强被广泛应用于有源电力滤波器,但传统FBD法在电网电压畸变下由于锁相环失锁,检测精度降低,且低通滤波器的使用存在稳态误差与响应速度不可兼得的固有矛盾。针对此不足提出一种改进型方法,该方法首先通过对三相电压偏移60°进而快速提取正序电压分量,以代替基准参考电压信号参与运算,避免了电压不对称引起的检测误差;并构建出一种基于双曲正切函数的变步长自适应滤波器获取基波等效有功电导,引入误差信号的自相关时间均值估计反馈步长迭代函数,使自适应算法和FBD检测算法有机融合,有效提升了算法的动态响应速度。理论推导与仿真结果证实了该改进算法的正确性与有效性。The harmonic detection method based on FBD power theory was widely used in active power filters because of its simple implementation and strong stability. However, the detection accuracy of traditional FBD method is reduced due to the phase-locked loop unlocking under the voltage distortion of the power grid, and there is inherent contradiction between the steady-state error and the response speed when using the low-pass filter.To solve this problem, an improved method is proposed. In this method, the positive sequence voltage component is extracted quickly by shifting the three-phase voltage by 60° to replace the reference voltage signal to participate in the operation, so as to avoid the detection error caused by voltage asymmetry.An adaptive filter with variable step size based on hyperbolic tangent function was constructed to obtain the equivalent active conductance of fundamental wave. The adaptive algorithm and FBD detection algorithm were integrated organically, and the dynamic response speed of the algorithm was improved effectively.Theoretical derivation and simulation results confirm the correctness and effectiveness of the improved algorithm.

关 键 词：FBD谐波检测 电压不对称 锁相环 自适应滤波器 变步长 

分 类 号：TM935[电气工程—电力电子与电力传动]