Suppression technology of input current harmonic and conducted electro-magnetic emission for arc welding equipment

These current harmonics exists in any nonzero speed and are independent of time-varying parameters,such as stator winding resistance.

This paper presents the current harmonic analysis of a high frequency model of AC/DC voltage source converter using PWM with phase and amplitude control.

PS-3000 harmonic current test system based on BP algorithm;

Shunt active filter based on harmonic current quick measuring method;

Assess harmonic currents of electric locomotive with Laguerre polynomials;

A filter for reducing harmonic currents in stator windings of 6-phase induction motor;

Based on the instantaneous reactive power theory, two groups of three-phase unit symmetrical rotating reference phasors with same frequency as that of power grid voltage is built and a novel approach to accurately detect harmonic currents by use of active power filter (APF) is proposed.

To eliminate the influence of AC side harmonic currents, a certain capacity of AC filters is installed correspondently, and the cost of them amount to 10% percent of a HVDC project cost, which is very important to the performance and cost of HVDC project.

Analysis of input current harmonics of welding inverter and its solving method

It presents the method of adopting shunt passive filters to solve current harmonics,and measures of modifying power supply modes and limiting voltage flickers.

The basic conception and the relationship of power factor, current harmonics and EMI for SCR(Silicon Controlled Rectifier) and SMR(Switch Mode Rectifier) at different stage are described.