A unity power factor buck type PWM rectifier for medium/high power DC motor drive applications (original) (raw)
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IEEE Transactions on Power Electronics, 2002
A novel rectifier topology for high power (0.5 to 10 MVA) current source based ac motor drives is proposed. This rectifier is composed of a multi-winding transformer, a multi-level diode rectifier and a modified multi-level buck converter. The rectifier produces near unity input power factor and sinusoidal input current under any operating conditions. In addition, the proposed rectifier features reliable operation and low manufacturing cost. In this paper, the operating principle of the proposed rectifier is introduced. A number of design issues are investigated, which include PWM switching patterns, input power factor and line current harmonic distortion. Some design considerations such as the effect of the line inductance discrepancy on system performance are addressed. Experiments on a 5 kVA/208V four-level prototype are carried out for verification.
A three-phase unity power factor front-end rectifier for AC motor drive
IET Power Electronics, 2012
This study presents the bidirectional controlled switch-based high-frequency (HF) current injection circuit with simple gate control scheme. Improved power factor and total harmonic distortion (THD) of ac input line current of front-end rectifier for ac motor drive is achieved using this scheme. The gating pulses for feedback bidirectional controlled switches are generated at every zero-crossing instances of the respective phase voltages for the duration of p/6 rad. The analysis of the converter along with loss calculations is presented. In order to validate the concept, a prototype model of a converter for 5 kW power using voltage source converter feeding three-phase induction motor is designed in the laboratory. The sinusoidal pulse width modulation switching signals are generated by using DSP (TMS320F2812). The computer simulation results and experimental results are also presented. It is observed that HF current injection for the duration of one-third of phase voltage period results in a remarkable improvement in input current THD and power factor of the front-end rectifier.
MULTI-PULSE AC-DC CONVERTERS FOR POWER QUALITY IMPROVEMENT IN DC DRIVES
This article presents the design, modeling and simulation of three-phase multi-pulseAC–DC converters (MPC)for the improvement of power quality by the elimination of harmonics in ac mains and ripples in dc output.Multi pulse converters are operated with DC motors and run at different conditions to obtain output with less harmonic distortion.Total harmonic distortion is calculated by FFT analysis.With the help of MATLAB/Simulink modelling, simulation and digital implementation has been done for power quality improvement in DC drives using multi pulse converters. In converter circuits generally semiconductor switching devises are used which generates harmonics voltages and currents. Three phase ac-dc conversion of electric power are employed in the applications such as Adjustable speed drives (ASDs), Highvoltage dc (HVDC) transmission, Electro-chemical processes such as electroplating, Telecommunicationpower supplies, batterycharging, uninterruptible power supplies (UPS), High-capacitymagnet power supplies, high-power induction heatingequipment'sand converters for renewable energy conversion systems The major contributor to power system harmonics and consequences are diode bridge rectifiers. Generally converters are fed from three phase ac supply and have power quality problems like harmonics injection causes ac voltage distortion, rippled dc voltages and poor power factor. Various methods are used to minimize the problems in ac-dc converters. The DC motor drives are used in industries for converting electrical energy to mechanical energy. The advantage of choosing DC motors over AC components is because of their speed control.The main objective of the paper is to provide the power to consumer/industry load with proper sinusoidal wave of the voltage and current with fixed frequency and magnitude with minimized Total harmonic distortion,according to IEEE standards THD must be less than 5%. Power quality improvement can be achieved in 3-phase ac-dc converters by using multi-pulse converters. The converters are strong, simple, rough and efficient. The auto transformer based arrangement are more economical due to reduced magnetic losses. Different configurations from 12 pulse, controlled 24 pulse and controlled 48 pulse based ac-dc converters have been reported in literature.In literature several publications are reviewed and found on reduction on total harmonic distortion of power systems which are discussed in below section 2. This paper is divided into five sections. Starting with Section 1 gives introduction. Section gives detailed view of literature on reducing THD. Section 3 discussed about modeling of uncontrolled 12 pulseand controlled 12 pulse converter, controlled 24 pulse converter, controlled 48 pulse converter. Section 4 presents digital implementation, THD results and discussion. Section 5 concludes this paper. II. LITERATURE REVIEW The main objective of the research is to lessen harmonics in converters. Many methods are implemented and developed by the researches based on the needs and suitability. Selective harmonic elimination with pulse width modulation(SHEPWM) or programmed-PWM. This method calculates the switching instants of the devices in order to satisfy certain criteria. SHE method gives best outputs among PWM methods with low switching frequency to fundamental frequency ratios, direct control over output waveform harmonics.
Comparison of Buck-Boost and Cuk Converters for BLDC Drive Applications with PFC
The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation. Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits. This project presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct current (BLDC) motor drive as a cost-effective solution for low-power applications. The conventional PFC scheme of the BLDC motor drive utilizes a pulse width-modulated voltage source inverter (PWM-VSI) for speed control with a constant dc link voltage. This offers higher switching losses in VSI as the switching losses increase as a square function of switching frequency. A BL configuration of the buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous inductor current mode (DICM) to provide an inherent PFC at ac mains. The simulation results are presented by using Matlab/Simulink software. The proposed concept can be extended with cuk converter for BLDC drive applications using Matlab/Simulink software KEYWORDS: Bridgeless (BL) Buck–Boost Converter, Brushless Direct Current (BLDC) Motor, Discontinuous Inductor Current Mode (DICM), Power Factor Corrected (PFC), Power Quality, CUK converter.
AC-DC & DC-DC Converters for DC Motor Drives Review of basic topologies
2013
This paper deals with a comprehensive survey on the topic of AC/DC & DC/DC converters for DC Motor Drives. A substantial number of different AC/DC and DC/DC topologies appropriate for DC motor drives are presented. This critical literature review brings out merits, demerits, and limitations besides giving the basic operating principles of various topologies. Keywords—controlled-rectifiers, choppers; dc motor drives; hard switching; soft-switching;
A PWM rectifierhverter system using insulated-gate-bipolar-transistors (IBGT's), capable of switching at 20 kHz is reported. The base drive circuit for the IGBT, incorporating short circuit protection is presented. The inverter uses Undeland snubber together with a simple energy recovery circuit , which ensures reliable and efficient operation even for 20 kHz switching. The front end for the system is a regenerative single phase full-bridge IGBT inverter along with an ac reactor. Steady-state design considerations are explained and control techniques, for unity power factor operation and fast current control of the front end converter, in a rotating as well as 'a stationary reference frame, are discussed and compared. Results from computer simulations as well as experimental results , for a 1.5-kW prototype system using GE IGBT's Type 6E20, are presented.
DESIGN AND IMPLEMENTATION OF A PULSE WIDTH MODULATED RECTIFIER FOR INDUSTRIAL APPLICATIONS
Three phase pulse width modulated voltage source rectifiers are widely used in uninterruptible power supplyand motor drive applications due to their low input current THD, adjustable input power factor,and bi-directional power transfer characteristics.In this paper utilization of this type of rectifier at the front end unit of an industrial type uninterrupted power supply is discussed. DC bus voltage is controlled through two high gain PI controllers. Sinusoidal Pulse Width Adjustable Triangle Wave Comparison for switching (SPWM) was selected as the control method. Unity power factor has been attained at the input along with very low THD values.
IJERT-Power Quality Improvement in A PMBLDCM Drive by Using PFC CUK Converter
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/power-quality-improvement-in-a-pmbldcm-drive-by-using-pfc-cuk-converter https://www.ijert.org/research/power-quality-improvement-in-a-pmbldcm-drive-by-using-pfc-cuk-converter-IJERTV2IS110849.pdf The techniques to improve the efficiency of motor drive by power factor correction play an important role in the energy saving during energy conversion. Permanent magnet brushless DC motor (PMBLDCM) drives are being employed in many variable speed applications due to their high efficiency, silent operation, high reliability, ease of control, and low maintenance requirements. These drives have power quality problems and poor power factor at input AC mains as they are mostly fed through diode bridge rectifier. To overcome such problems a single-phase single-switch power factor correction AC-DC converter topology based on a Cuk converter is proposed. It focuses on the analysis, design and performance evaluation of the proposed PFC converter topology for PMBLDCM drive used for an airconditioning system. The proposed PFC converter topology is modeled and its performance is simulated in Matlab-Simulink environment and results show an improved power quality and good power factor in wide speed range of the drive. Also compared THD of the Input AC current with both PI controller and Fuzzy logic controller in Mat lab-Simulink environment.
POWER FACTOR CORRECTION CONVERTER FOR AC DRIVES
— In this paper deals with a power factor correction (PFC) converter for AC drives using pulse width modulation current control technique and also presents a topology for driving a three phase induction motor with a single phase AC supply is proposed. Single phase buck and boost DC-DC converter is used to obtain near unity power factor and to reduce the harmonic distortion in the main supply. The proposed scheme is simulated in MATLAB-2010-SIMULINK. In the proposed scheme VHDL coding was developed to generate the sinusoidal PWM gate signal of proposed PFC converter. A three phase, 415V, 0.5Hp, 3 phase induction motor is used as load for testing the developed hardware. The simulation and experimental result confirms that power factor has been increased for all loads.
IEEE Transactions on Plasma Science, 2008
Pulse loads, like solid-state pulse modulators, generate short pulses with a high peak power that exceeds the average power by 100-1000 times depending on the pulse repetition rate. There, the peak power usually is drawn from an energy buffer such as a capacitor bank. The pulse discharges the energy buffer, and it is fully recharged in the time between the pulses by a power supply, which is usually connected to the mains. Due to the worldwide variation in mains voltages and the desired ability to adapt to the capacitor voltage of the modulator, the power supply has to support a wide input and output voltage range. Additionally, the supply should draw a sinusoidal current from the mains while providing energy to the pulse modulator due to electromagnetic interference regulations. Therefore, a general control concept for pulse load applications, which guarantees continuous power consumption from the mains and power factor correction, is described in this paper. Furthermore, measurements of the control principle, which is independent from the converter topology, are presented for a three-phase buck-boost rectifier.