Impacts of three‐phase power converter operating modes on harmonic emissions in distribution networks: harmonics emission within 2–9 kHz

Analysis of 0–9 kHz Current Harmonics in a Three-Phase Power Converter Under Unbalanced-Load Conditions

“…Where s a , s b , and s c are the switching functions of inverter at phases a to c as given by ( 2) to (4) derived based on the sine-triangular PWM [19].…”

“…In fact, this term remains when the terms 1 and 2 are removed from (2) to (4). The last term of s a denoted by s a,ωc , which models the switching pattern around mω c at phase a, is multiplied by the positive-sequence current of phase a as given in (19).…”

“…Then, these switching functions, which are determined based on the double Fourier analysis, could be multiplied by the load-side currents in the time domain. This approach has been employed in [19] to find the current harmonics of i inv at a balanced-load condition. Moreover, the accuracy of estimating i inv has been improved in [20] by considering load-side current harmonics.…”