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...

Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power mediumvoltage energy control. Using multilevel inverters application in fuel cell, solar cell & wind turbines is increasing now a day‘s rapidly. Therefore, Harmonic reduction techniques in multilevel inverters are considered very important task Over the past decades, depending upon the ...

We briefly introduce the source and harm of aircraft grid harmonic and summarise the common methods of harmonic reduction, such as passive filter, multi-pulse rectifier, power factor correction and active power filter. Then we introduce the disadvantages of the above methods, analyse the application status, advantages and deficiencies of active power filter in aircraft grid harmonic reduction, ...

This paper presents method of selecting switching angles of a cascaded multilevel inverter so as to produce required fundamental voltage along with improved staircase waveform in terms of harmonics. Cascaded multilevel inverter uses number of DC sources, for k sources number of levels will be 2k+1 and leads to k number of non-linear equations to be solved. Many approaches can be made regarding ...

HARMONIC REDUCTION IN A SINGLE-SWITCH THREE-PHASE BOOST RECTIFIER WITH HARMONIC-INJECTED PWM by Qihong Huang Fred C. Lee, Chairman Electrical Engineering

In this paper, we consider a designed and implemented dimmer. The dimmer is closed loop and phasecutting type. In fact, a microcontroller calculates and then regulates the firing delay angles of eight triacs. Depending on the firing angle, the harmonic distortion in the input current will not comply with international standards, such as IEC 61000-3-2(class C equipments). For solving this proble...