Variable parameter pulse width modulation‐based current tracking technology applied to four‐switch three‐phase shunt active power filter

Abstract

A novel configuration is proposed with a y/y step-up transformer adding to AC side of the four-switch three-phase (FSTP) active power filter (APF), so as to improve the utilisation of DC voltage and further widen the voltage range of FSTP APF. To ameliorate the current tracking performance of the FSTP inverter, a variable parameter pulse width modulation (VPPWM) approach is presented. In the proposed VPPWM method, the triangular wave is not fixed but derived by integration of reference current error signals. A pulse width coefficient T is also adopted in VPPWM together with the parameter k, so as to make the APF current tracking width adjustable and the resultant over-high switch frequency issue is effectively compromised. The principle and implementation of the VPPWM approach are elucidated in detail, and the validity is demonstrated by simulation studies. The simulation results are compared with that of the proportional-integral control triangular wave comparison approach and the current hysteresis tracking approach, which indicates that the VPPWM methodology shows superior performance in response speed and accuracy to the other ones. 2 Mathematical model of FSTP shunt APF Since DC voltage efficiency of FSTP topology is just half that of the SSTP [9], hence, DC voltage level in FSTP topology should be twice that of SSTP so as to achieve the same output. If the source voltage fluctuations as well www.ietdl.org

Torque ripple elimination based on inverter voltage drop compensation for a three‐phase four‐switch inverter‐fed PMSM drive under low speeds

“…In this section, comparative experimental studies of the proposed compensation method and the previous uncompensated strategy in [6][7][8][9][10][11][12][13][14][15] are conducted on a 2-kW PMSM test bench shown in Fig. 6, which is driven by a TPFS inverter.…”

“…Based on (13), the harmonic voltages injected into the stator voltages are depend on the values of inverter voltage drops V 3 and V 4 . The instantaneous voltage drop caused by the semiconductor power switch can be represented by an on-state forward voltage drop v f connected in series with an on-state resistance R on [13]. Thus,…”

“…The capacitor voltage fluctuations produce time-variant asymmetrical voltage vectors in the TPFS inverters, leading to undesirable pulsating torques. Therefore, considerable research efforts have been focused on the compensated modulation schemes for TPFS inverters to eliminate the torque ripples caused by the capacitor voltage fluctuations [7][8][9][10][11][12][13][14][15].…”

A Performance Investigation of a Four-Switch Three-Phase Inverter-Fed IM Drives at Low Speeds Using Fuzzy Logic and PI Controllers

“…Four-switch three-phase (FSTP) inverters instead of SSTP inverters have been used in motor drives [4]- [9], renewable energy applications [10], and active power filters [11], [12]. Control of FSTP brushless dc motor drives has been presented in [4]; using DTC with non-sinusoidal back EMF [5], using single current sensor [6] or using DTC with reduced torque ripples [7].…”

Control Method for Fault-Tolerant Active Power Filters

“…For the indirect control method, some studies [10]- [14] analyze the three-phase four-switch inverter fault-tolerant control strategy. The study in [15] introduces this kind of control strategy to the control of an APF and the study in [16] discusses the operation of a TFSSAPF when the three-phase grid voltage is unbalanced and the grid is under a short-time fault.…”