Measuring current and voltage harmonics has paramount importance for improving the power quality of distribution grids. However, achieved accuracy strongly depends on adopted instrument transformer. The present paper proposes an adaptive technique that enables effective compensation both filtering behavior harmonic distortion introduced by transformers, namely strongest nonlinear effect at low-...

Nowadays, active power filter (APF) is the most popular device for harmonic compensation. This paper presents soft computing techniques compensation of currents harmonics using a shunt (SAPF). The method includes 3-phase supply system with current-controlled voltage source converter (CC-VSC) having an input coupling inductor and output tank capacitor self-supported DC bus. performance can be en...

Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power. Diverse control techniques have been proposed to evaluate the instantaneous output voltage of the series active power filter of the UPQC but, in most cases, these controllers only can compensate a kind of vol...

Owing to the use of nonlinear loads in distribution side, there are power quality issues such as voltage swell/sag, harmonics, flickers, imbalance, and outage. The harmonics system affect hence a suitable methodology is vital mitigate compensation reactive power. In this paper, CNN (Convolutional Neural Network)-based harmonic mitigation performed. A 5-level cascaded H-bridge inverter employed ...

Thyristor controlled static compensators consist of two basic schemes, TCR and TSC. Owing to the discontinuous current in TCR, current harmonics are generated in the supply system. This paper introduces two methods for the reduction of these harmonics. On the basis of the coordination or uncoordination of turn ratios with harmonic reduction levels, each method is described in two alternative sc...

Active power filter continues to be a powerful tool to control harmonics in power systems thereby enhancing the power quality. This paper presents a fuzzy tuned PID controller based shunt active filter to diminish the harmonics caused by non linear loads like thyristor bridge rectifiers and imbalanced loads. Here Fuzzy controller provides the tuning of PID, based on firing of thyristor bridge r...

The aim of this paper is to improve the reactive power compensation and active filtering capability of a Wind Energy Conversion System (WECS). The proposed algorithm is applied to a Doubly Fed Induction Generator (DFIG) with a stator directly connected to the grid and a rotor connected to the grid through a back-to-back AC-DC-AC PWM converter. The control strategy of the Rotor Side Converter (R...

We report on the use of an active Langmuir probe with three-harmonic compensation to diagnose rf discharge plasmas driven at 13.56 MHz. The plasma generates many harmonics on the fundamental, the first few being strongest. This gives a multi-harmonic rf voltage across the probe sheath that is removed by applying a rf signal to the probe that is matched both in amplitude and in phase for each ha...