A comparative study of harmonic currents extraction by simulation and implementation

Abstract

a b s t r a c tThe aim of the present work is to obtain a perfect compensation by extracting accurate harmonic currents. The objective is to avoid the consequences due to the presence of disturbances in the power system. A comparative study of harmonic currents extraction by simulation and implementation is carried out for two different techniques. The first technique is based on the instantaneous powers, taking advantage of the relationship between current and the power transformed from the supply source to the loads. The second is based on ADALINE neural network. The neural method can estimate the harmonic terms individually and online, therefore, the APF can realise a selective compensation. The developed architectures are validated by computer simulation and experimental tests. The algorithms are implemented in the dSPACE Board in order to show the effectiveness and capability of each technique. The results have demonstrated that the speed and the accuracy of the ADALINE can improve greatly the performances of active power filters.

Direct neural method for harmonic currents estimation using adaptive linear element

“…The reference current waveform extracted by the direct neural method as shown in Fig. 7b is better than the reference current identified by the conventional p-q theory [21]. The waveform of the fundamental load current deduced with p-q theory in [21] is affected by the poor quality of the supply voltage waveform when the test is carried out.…”

“…The application of intelligent techniques in the field of electrical systems is recent. Artificial neural networks are successfully applied to power systems [16,17], especially for harmonic extraction [18][19][20][21][22].…”

“…The previous work conducted by the authors of the present paper [21] compares the classical PQ method with the diphase currents neural method. These two methods are applicable only for a three-phase network.…”

An Insight to Harmonic Suppression Techniques with Power Filters in Power Electronics

“…Considering input voltage as 230 volts and simulated in Simulink, the outcome of the study was analyzed with respect to voltage sag and swell waveforms and the coefficient in DWT. Another unique study was proposed by Merabet et al [31] most recently, where the author have adopted neural network to evaluate harmonics in dSPACE board. The outcome of the study was evaluated and compared with P-Q theory and diphase currents with respect to reactive power compensation, extent of harmonic compensation, and direct components needed.…”

Performance evaluation of Shunt Active Harmonic filter under different control techniques

“…The performance of control strategy for SAHF depends on load voltage and load current to improve Total Harmonic Distortion (THD) and mitigation of harmonics in Non-linear systems by pq theory [10]- [14] and dq theory [15]. The design model of these two techniques analyzed [16].These theories are well explained in [17].…”