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This paper presents the development and performance evaluation of new multi-level ac-dc power electronic converter (PEC) for applications in permanent magnet generator (PMG)-based wind energy conversion systems (WECSs). In order to feed the multi-level ac-dc PEC from one 3ϕ supply, it is built by using modified H-bridge cells. Each of the modified H-bridge cells is constructed from forward and backward...
A new method for reducing harmonics involved in input voltages of a three-phase voltage source diode rectifier is proposed. It is applied to the conventional 6-step diode rectifier with a three-phase autotransformer. By injecting harmonics to the neutral point of the autotransformer from an auxiliary circuit, input voltages of the proposed diode rectifier can be almost the same as a conventional 36-step...
Multipulse rectifier topologies based on phase-shifting auto-connected transformers are increasingly applied in power electronics devices for power quality improvement. Due their construction, they mitigate many low-harmonic frequency and reduce the Total Harmonic Distortion of the line current (THDi), resulting a high Power Factor (PF). The 18-pulse topology is formed by a phase-shifting transformer...
According to the problems that the voltage transfer ratio of matrix converter voltage is low and the modulation strategy is complex, a new SVPWM modulation strategy using multiple inverters to reconstruct the matrix converter is put forward. The strategy uses the largest three-phase line voltage as the DC link voltage of the inverter to improve the voltage transfer ratio. The reconstruction is based...
The need of controlled rectifiers to provide input power factor correction with reduced harmonic content drawn from ac mains and regulated dc output voltage has motivated the proposal of various topologies based on the classical converters such as boost and buck-boost topologies. Distinct control techniques have been also introduced with the commercial availability of integrated circuits (ICs) to...
This paper presents an unidirectional single-phase to three-phase AC-DC-AC converter. The single-phase converter is composed of two parallel single-phase rectifiers with an uncontrolled shared-leg. Suitable modelling, including the circulation current, and control strategy are developed. A comparison between sinusoidal PWM (with and without interleaved technique) and the 1-D (unidimensional) control...
This paper reports on tests performed to determine the response of common low voltage power supplies when their AC power feed is distorted by various types and levels of harmonic distortion. Such distortion could be a possible form of IEMI attack on a facility. It is found that switched mode power supplies are immune to such attacks, but rectifier type supplies are very susceptible, if the distortion...
In this paper a proposed control strategy based on fuzzy logic for three-phase PWM rectifiers is discussed. This technique is called direct control of fuzzy power (DPCF). The objective of this paper is to substitute both hysteresis controllers of the active and reactive power by a single fuzzy controller which adjusts both active and reactive power at the same time. The aim of this work is to eliminate...
Input current and power factor improvements of single and three-phase rectifiers by switch mode regulators are usually achieved by switching the output of rectifier's diode bridge. In this paper a three phase buck rectifier is proposed which is switched at the input side by one three phase bi-directional switch. The input switching makes input current switched at high frequency, which is then filtered...
Input current and power factor improvements of single and three-phase rectifiers by switch mode regulators are usually achieved by switching the output of rectifier's diode bridge. In this paper a three phase boost rectifier is proposed which is switched at the input side by one three phase bidirectional switch. The input switching makes input current switched at high frequency, which is then filtered...
A hybrid three-phase rectifier with switched current injection device and high frequency switching current injection network is analyzed in this paper. The rectifier applies suboptimal current injection. Optimization of the injected current amplitude is performed, resulting in the minimum of the input current THD of 4.36%. Ratings of applied semiconductor devices are derived. Effects caused by finite...
In this paper a digital control technique for power factor correction (PFC) using boost rectifier is proposed. The control technique implements a digital average current mode control which is accomplished by diode current sensing method. The conventional inductor current sensing method produces negative current signal. This sensed signal needs an additional circuit for being applied to digital controller...
Temporary voltage sags are the main cause of untimely arrest in automated systems that use adjustable speed drives (ASDs). In this context, this paper presents an analysis of a new hybrid three-phase rectifier designed to correct the power factor and to promote voltage sag ride-through capability to ASDs. To prove the effectiveness of the proposed solution, this paper presents results of simulations...
In this paper, a single-phase DC power supply based on single-phase matrix converter (SPMC) with reduced number of switches is proposed. In the proposed approach, only six switches of the typical SPMC topology are used to convert the voltage 240 Vrms (50Hz) input to a 12 VDC DC link. In the proposed topology a current control loop is used to ensure that the supply current waveform is continuous, sinusoidal...
This paper proposes a digital average current mode control method in discontinuous conduction mode (DCM) power factor correction (PFC) rectifier. The proposed control technique can directly sense the average value of the inductor current in each switching cycle digitally by employing a conventional current sensing circuit. Thanks to the current control loop, high speed analog-to-digital converters...
Matrix electric power conversion topologies and their switch functions are flexible, as can be used to derive other electric power conversion topologies and switch functions for specific applications. This paper presents the Single Phase Matrix Converter (SPMC) topology that will operate as rectifier, inverter, buck converter, boost converter, chopper and cycloconverter. The circuit composed from...
This paper presents a novel sinusoidal pulse width modulation (SPWM) strategy for single- to three-phase matrix converter. The proposed strategy is simple to implement. Also an improved SPWM (ISPWM) strategy for decreasing total harmonic distortion (THD) is proposed. The performance of proposed SPWM strategy and ISPWM strategy are compared with each other. Detailed analysis is provided for Single...
Three new bridgeless single phase ac-dc power factor correction (PFC) rectifiers based on Cuk topology are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and an improved thermal management compared to the conventional Cuk PFC converter. The proposed topologies...
In this paper, a new compensation strategy for receiving clean power is proposed with a conventional 18-pulse AC/DC rectifier scheme. In the proposed strategy, the compensation currents are injected at the dc side in front of the inter-phase transformer. The injected currents generated by a three-phase current-controlled inverter effectively improve the total harmonic distortion (THD) of the ac main...
The need for solid-state ac-dc converters to improve power quality in terms of power-factor correction (PFC), reduced total harmonic distortion at input ac mains, and precisely regulated dc output have motivated the proposal of several topologies based on classical converters such as buck, boost, and buck-boost. Additionally, novel control techniques dedicated to PFC have also been introduced, motivating...
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