Harmonic reduction using a novel multipulse AC-DC converter

Abstract

Purpose For direct torque controlled induction motor drives, an effective solution to eliminate harmonics is the use of multipulse alternating current (AC)-direct current (DC) converters. Many researchers have used different configurations based on 24- and 30-pulse rectifications for improved power quality. However, the total harmonic distortion (THD) of AC mains current with these topology is more than 4 per cent when operating at a light load. For mitigating the THD problems observed in the input currents, Abdollahi propose 40-, 72- and 88-pulse AC-DC converters, while the power quality enhancement was the main concern. It is known that by increasing the number of pulses further results in reduction in current harmonics, but this is accompanied by an increase in cost and complexity. In this context, the purpose of this paper is to design a new delta/hexagon transformer based 36-pulse AC-DC converter for harmonic reduction without increasing the cost and complexity. Design/methodology/approach The proposed converter consists of two paralleled 18-pulse AC-DC converters involving a nine-phase shifted uncontrolled diode bridges with an interphase transformer circuit. Findings In this paper, the proposed scheme is simulated by matrix laboratory (MATLAB)/SIMULINK considering different loading scenarios. The simulation results show that the proposed scheme improves the power quality indices and satisfies the The Institute of Electrical and Electronics Engineers (IEEE)-519 requirements at the point of common coupling. Also, a laboratory prototype is implemented using the proposed design, and the experimental results confirm the simulation results under different loading conditions. Originality/value The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard.

Induction motor drive based on direct torque controlled used multi-pulse AC-DC rectifier

“…However, these topologies have high magnetic ratings and are therefore expensive. Increasing the number of pulses reduces the current THD but with the additional complexity and cost of MPRs [27][28][29][30][31][32][33]. On the other hand, the use of passive or active filters can also lead to current THD reduction [34][35][36][37][38][39][40].…”

Current mode fractional order PID control of wind-based quadratic boost converter inverter system with enhanced time response

“…Thus Drain to Source Resistance is ON for power switch is required. Again, input current of the proposed converter is proceeded; thus, weight on the info source is reduced (Abdollahi, 2018;YiyangLi and Sathiakumar, 2017;Babaei et al, 2017). The working standards and relentless state examinations are discussed in detail for both continuous conduction mode and discontinuous conduction mode.…”

Design of symmetrical half-bridge converter with a series coupling capacitor

“…As passive PFC is still widely used because of its simplicity, so in order to further explore the HB converter, a passive PFC technique is also implemented to improve the power quality of the converter. The other PFC methods such as active PFC methods could also applied to achieve better PF, however, active PFC complexes the simple SMPS circuit with additional PFC control loop such as predictive current mode control (Choi et al, 2018), modulated carrier control (Kim, et al, 2018), sliding mode (Mallik et al, 2018) and with advanced design such as delta/hexagon transformer design reported in a 3-Phase power line where a nine phase shifted uncontrolled diode bridges with interphase transformer is applied (Abdollahi, 2018).…”