基于积分组合的FBD谐波检测法

FBD harmonic detection method based on integral combination

常规电力滤波器谐波电流检测方法利用锁相环检测电压定向角,这样在参数设计时会非常复杂,不利于工程应用,除此之外,常规方法在滤波时还采用低通滤波器,它本身的固有延迟会造成系统实时性下降。为克服上述缺陷,在传统FBD检测方法的基础上提出一种改进方法。该方法在检测过程中采用广义积分器取代锁相环检测电压相位,采用积分均值法取代传统的低通滤波方式来滤除畸变电流中的谐波分量,与传统方法相比,提高了电流幅值和相位检测的精确性,缩短了响应时间。同时,仿真实验验证了该方法的正确性和可行性。

The conventional method uses phase -locked loop to detect the voltage orientation angle, by which the parameters are very complicated to design, leading to bad effects in engineering applications. Besides, the low pass filter adopted, which has an inherent delay lowering the real - time while filtering. In order to overcome the above shortcomings, this paper proposed the improved method on the basis of the traditional FBD method. It is a method that replaces the phase - locked loop by the generalized integrator to detect voltage phase, and the traditional low pass filter by the integral average method to remove distortion harmonic and to extract the DC component. Compared with the traditional method, the improved method makes the detection of the current amplitude and phase more accurate with the shortened response time. The simulation results verify the correctness and feasibility of the improved method.