A novel adaptive harmonic detecting algorithm applied to active power filters

Abstract

The performance of active power filter (APF) depends on the method applied to the harmonic current detection, a novel variable step-size LMS algorithm is proposed, where using autocorrelation time mean estimate of error signal to update the step-size, it can suppresses the effect of the harmonic components on the updating of step-size. The performance of the algorithm is validated through a simulation with MATLAB software. The result shows that the novel algorithm has advantages of a quite high detection precision, a big convergence rate and a good noise immunity performance, which is the same as theoretical analysis.

Control of DSTATCOM using adjustable step least mean square control algorithm

“…A block diagram of an adjustable step LMS control algorithm for extraction reference currents are shown in Fig. 2(a) [11].…”

“…It is represent as τ p (k) for sampled value based on the theory of step size updating. Its update equation is given as [11].…”

“…Artificial intelligence (AI) based techniques can be applied for harmonic detection, reactive component control, DC link voltage and parameter design etc [8]. Some of the advanced control algorithm based on adaptive and AI are echo state network for adaptive control algorithm [9], feed forward neural network [10] and novel adaptive harmonic detection based on LMS control algorithm [11] etc. From the available literature, it observed that, most of application of AI and /or adaptive control theory based control algorithms are limited to single phase application only or confined to simulation studies.…”

Control Method for Fault-Tolerant Active Power Filters

“…However, in these papers the sector of the vector is classified by the phase angle of the reference vector, which requires a massive trigonometric function calculation. In order to avoid the use of a look-up table by the digital processor to obtain the trigonometric calculation results and to get the sector number through the positive and negative values of the line voltage in the same way as the three-phase six-switch APF, the study in [17] greatly reduces the complexity of the algorithm by means of vector rotation. Based on that, the study in [18] proposes a five-segment-type SVPWM modulation algorithm.…”