NEW METHOD OF SIZING A FILTER (RL-C) FOR AN INVERTER WITH SPWM CONTROL IN MEDIUM VOLTAGE ALTERNATING

The need to use SPWM controlled voltage inverters in MV, led us to examine how to filter alternative signals with filters (L-C) and (RL-C). This allowed us to decide on the use of certain formulas for calculating the elements of these filters. Likewise, we have proposed a method of calculating the resistance R by mathematical iterations without using the quality factor Q, in order to obtain a low error rate between the RMS values and the fundamental effective values and THDs respecting the standard 519 IEEE - 2014. The results of these studies obtained using the MATLAB-SIMULINK software are presented in the penultimate session of this article.

Nomenclature

SPWM                                  Sinusoidal Pulse-Width-Modulation

THD                                      Total Harmonic distortion

S_N                                           Apparent power of the alternating load

MV                                       Medium voltage alternating voltage (1 kV --- 50 kV)

Uph                                       phase-to-phase voltage at the ac load

RMS                                      Root Mean Squared

R L C                                    Resistance Inductance Capacitor

MVDC                  Medium voltage direct current

VSI                                        Voltage Source Inverter