Single‐phase universal active power filter based on ac–dc–ac converter with eight controlled switches

Abstract

This study presents an ac-dc-ac converter with eight controlled switches. The proposed topology is applied as a universal active power filter, compensating for disturbances in the grid voltage, voltage sags/swells, and harmonics generated by non-linear loads. The difference between the proposed and conventional solution is the addition of an uncontrolled leg (composed only of diodes) to increase the number of voltage levels, reducing harmonics and the average switching frequency. For performance comparisons, current total harmonic distortion (THD), voltage weighted THD, switching and conduction losses of the semiconductors, and average switching frequency were used as parameters. Control and pulse-width modulation techniques based on space vector approaches were developed to eliminate zero-crossing distortions caused by the use of the uncontrolled leg. Simulation and experimental results were presented for validation of the mathematical model.

A novel control method for enhanced performance of single‐phase matrix converters

“…The modulation index is taken between 0.1 and 1 with 0.1 stepping. As given in (2), due to the nature of the source waveform, V o changes when f o > 2f in . Therefore, the average of the rms value variation is taken when the synthesized output frequencies are 150 and 300 Hz.…”

“…The rms value of the output voltage V o may vary depending on the synthesized output frequency f o due to the inherent characteristic of the source ac waveform. For a sinusoidal source voltage of (1), V o can be represented as in (2).…”

“…In recent years, significant research efforts have been dedicated to power-electronic-based ac-ac converters to replace low-frequency low-and medium-voltage transformers, solve power system-related problems, and replace bulky mechanical solutions for frequency conversion and voltage regulation. Power electronic-based ac-ac converters can be mainly divided into three categories: indirect ac-dc-ac converters, [1][2][3] direct ac-ac pulse width modulation (PWM) converters, [4][5][6] and matrix converters (MCs). [7][8][9] Indirect ac-dc-ac converters are able to regulate the output voltage and provide variable output frequency.…”

Reconfigurable Control of PWM AC-DC-DC Converter without Redundancy Leg Supplying an AC Motor Drive

“…Introduces another variable S 11 , S 21 and S 31 which taking 1 if the switch k i1 is closed or −1 if the switch opened ( Fig. 3) [16][17][18][19][20][21]…”

Modified fuzzy neural network control using sliding mode technique for power quality improvement system with experimental verification

“…In [1], a novel fuzzy hysteresis band current control was constituted to reduce the switching losses of APF. A universal APF using an ac-dc as a converter with eight controlled switches was proposed to increase the number of voltage levels in [2]. In [3], LCLC coupling APF has been developed to provide enhanced harmonic elimination in practical implementations.…”