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.

Method for measuring harmonic voltage by series active power filters;

By analysis and comparison,some conclusions are presented as references for revising notional harmonic voltage standard.

The improving the quality of power supply and economical operation of power system depends on the accurate and real-time detection of harmonic voltage.

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.