Design of Three-Phase Three-Switch Buck-Type Rectifier for Pre-Charging Application

2016 ◽  
Vol 7 (1) ◽  
pp. 124
Author(s):  
Anandh S ◽  
Vijayan S ◽  
Paramasivam Paramasivam
Keyword(s):  
Output Voltage ◽  
Design Procedure ◽  
Control Technique ◽  
Variable Frequency ◽  
Passive Components ◽  
Power Transistors ◽  
Three Phase ◽  
Variable Frequency Drives ◽  
And Control ◽  
Selection Of

The main objective of a pre-charging circuit in variable frequency drives is to pre-charge the DC-bus capacitor without any voltage and current overshoot within the specified time. In exisiting variable frequency drives seperte pre-charging circuits (or) thyristor bridges were used due to this drives power density, cost becomes high and control technique becomes complex.  This paper presents about the design of three-phase three-switch buck-type rectifier for pre-charging application used in variable frequency drives which elimates the disadvantages of existing techniques. In this paper we will discuss about design procedure of pre-charging circuit of an 800KW converter with dc-link output voltage of 775V at an input ac voltage of 550V, 60Hz, selection of power and passive components, voltage and current stress of power transistors. In the final this paper discusses about loss distribution of the components and comparison of new converter technique with existing pre-charging techniques.

Selection of Rotor Position Sensor Resolution for Variable Frequency Drives Utilizing Fixed-Position-Based Speed Estimation

2021 ◽  
Author(s):  
Luigi Danilo Tornello ◽  
Giacomo Scelba ◽  
Giulio De Donato ◽  
Fabio Giulii Capponi ◽  
Giuseppe Scarcella ◽  
...  
Keyword(s):  
Variable Frequency ◽  
Speed Estimation ◽  
Position Sensor ◽  
Fixed Position ◽  
Rotor Position ◽  
Variable Frequency Drives ◽  
Sensor Resolution ◽  
Selection Of

A NOVEL THREE-PHASE THREE-SWITCH THREE-LEVEL UNITY POWER FACTOR BOOST-TYPE PWM RECTIFIER

1995 ◽  
Vol 05 (03) ◽  
pp. 479-501 ◽  
Author(s):  
JOHANN W. KOLAR ◽  
FRANZ C. ZACH
Keyword(s):  
Output Voltage ◽  
Digital Simulation ◽  
Pwm Rectifier ◽  
Unity Power Factor ◽  
Power Transistors ◽  
Current Consumption ◽  
Blocking Voltage ◽  
Three Phase ◽  
Voltage Stress ◽  
System Components

Based on the combination of a three-phase diode bridge and a DC/DC boost converter a new three-phase three-switch three-level PWM rectifier system is developed. It can be characterized by sinusoidal mains current consumption, controlled output voltage and low blocking voltage stress on the power transistors. The application could be, e.g., for feeding the DC link of a telecommunications power supply module. The stationary operational behavior, the control of the mains currents and of the output voltage are analyzed. Finally, the stresses on the system components are determined by digital simulation and compared to the stresses in a conventional PWM rectifier system.

Analysis and Simulation of a High Step-Up DC-DC Converter for Renewable Energy System Applications

2015 ◽  
Vol 775 ◽  
pp. 378-382
Author(s):  
Sudarat Khwan-On ◽  
Sopida Vatcharasukpo
Keyword(s):  
Renewable Energy ◽  
High Voltage ◽  
Control Strategy ◽  
Output Voltage ◽  
Voltage Regulation ◽  
Operating Conditions ◽  
Control Technique ◽  
Power Switch ◽  
Three Phase ◽  
Voltage Conversion

This paper proposes a new step-up DC-DC converter topology with a high voltage conversion ratio for renewable system applications. The desired high voltage gain and satisfactory performance can be achieved by employing only a single power switch with simple control technique. The proposed converter can be used to step up the low voltage generated from renewable energy sources, such as solar photovoltaic modules, to the high level of the dc bus voltage, obtaining low-to-high voltage conversion ratios of approximately 30 times without adopting extremely large duty cycle. Employing the proposed converter the low input voltage (20-50Vdc) can be boosted up to the high output voltage level about 600Vdc at the dc-link bus required for the three-phase inverter feeding the three-phase motor drive system. In this paper, the proposed converter configuration with only one active power switch is presented. The operating principleincluding analysis of the steady-state performance characteristics under continuous conduction mode (CCM) operating conditions is described. In addition, the control strategy is developed in order to obtain the satisfactory output voltage regulation. Finally, simulation results are shown to demonstrate the effectiveness of the proposed converter with its control strategy to achievehigh step-up conversion ratios under different operating conditions.

scholarly journals Power Quality Analysis of the Output Voltage of AC Voltage and Frequency Controllers Realized with Various Voltage Control Techniques

2021 ◽  
Vol 11 (2) ◽  
pp. 538
Author(s):  
Naveed Ashraf ◽  
Ghulam Abbas ◽  
Rabeh Abbassi ◽  
Houssem Jerbi
Keyword(s):  
Power Quality ◽  
Output Voltage ◽  
Frequency Control ◽  
Voltage Control ◽  
Voltage Regulation ◽  
Quality Analysis ◽  
Control Technique ◽  
Control Techniques ◽  
Power Quality Analysis ◽  
Selection Of

Single-phase and three-phase AC-AC converters are employed in variable speed drive, induction heating systems, and grid voltage compensation. They are direct frequency and voltage controllers having no intermediate power conversion stage. The frequency controllers govern the output frequency (low or high) in discrete steps as per the requirements. The voltage controllers only regulate the RMS value of the output voltage. The output voltage regulation is achieved on the basis of the various voltage control techniques such as phase-angle, on-off cycle, and pulse-width modulation (PWM) control. The power quality of the output voltage is directly linked with its control techniques. Voltage controllers implemented with a simple control technique have large harmonics in their output voltage. Different control techniques have various harmonics profiles in the spectrum of the output voltage. Traditionally, the evaluation of power quality concerns is based on the simulation platform. The validity of the simulated values depends on the selection of the period of a waveform. Any deficiency in the selection of the period leads to incorrect results. A mathematical analytical approach can tackle this issue. This becomes important to analytically analyze the harmonious contents generated by various switching control algorithms for the output voltage so that these results can be successfully used for power quality analysis and filtering of harmonics components through various harmonics suppression techniques. Therefore, this research is focused on the analytical computation of the harmonics coefficients in the output voltage realized through the various voltage and frequency control techniques. The mathematically computed results are validated with the simulation and experimental results.

scholarly journals Planning and Building Electric of an Flower Carnival Car at University of Debrecen

2019 ◽  
Vol 11 (1) ◽  
pp. 19-22
Author(s):  
Antal Apagyi ◽  
Tamás Szmolka ◽  
Géza Husi
Keyword(s):  
Electric Power ◽  
Carrying Capacity ◽  
Planning Process ◽  
Battery Pack ◽  
Variable Frequency ◽  
Electric Motors ◽  
Three Phase ◽  
Variable Frequency Drives ◽  
The Creation

Abstract In this research we will discuss the creation of the flower cart. It will be examined from an economical and environmental perspective. Additionally, the planning process regarding the carrying capacity and battery runtime will be explained. The cart is moved by three-phase electric motors which are controlled by Variable Frequency Drives (VFD). Electric power is supplied by the large battery pack. Overall, the purpose of this vehicle is to be able to participate in the carnival march while increasing the quality of the event.

scholarly journals Modeling and control of a three-phase isolated grid-connected converter for photovoltaic applications

2011 ◽  
Vol 22 (3) ◽  
pp. 215-228 ◽  
Author(s):  
Marcelo Gradella Villalva ◽  
Marcos Fernando Espindola ◽  
Thais Gama de Siqueira ◽  
Ernesto Ruppert
Keyword(s):  
Output Voltage ◽  
Closed Loop ◽  
Transfer Functions ◽  
Voltage Source ◽  
Small Signal ◽  
Modeling And Control ◽  
Photovoltaic Array ◽  
Three Phase ◽  
Photovoltaic Applications ◽  
And Control

This paper describes the modeling and control of a three-phase grid-connected converter fed by a photovoltaic array. The converter is composed of an isolated DC-DC converter and a three-phase DC-AC voltage source inverter The converters are modeled in order to obtain small-signal transfer functions that are used in the design of three closed-loop controllers: for the output voltage of the PV array, the DC link voltage and the output currents. Simulated and experimental results are presented.

Vector Control of Three-Phase Induction Motor with Two Stator Phases Open-Circuit

2015 ◽  
Vol 6 (2) ◽  
pp. 282
Author(s):  
Seyed Hesam Asgari ◽  
Mohammad Jannati ◽  
Tole Sutikno ◽  
Nik Rumzi Nik Idris
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Open Circuit ◽  
Two Phase ◽  
Modeling And Control ◽  
Control Techniques ◽  
Three Phase ◽  
Variable Frequency Drives ◽  
Novel Method ◽  
And Control

<p>Variable frequency drives are used to provide reliable dynamic systems and significant reduction in usage of energy and costs of the induction motors. Modeling and control of faulty or an unbalanced three-phase induction motor is obviously different from healthy three-phase induction motor. Using conventional vector control techniques such as Field-Oriented Control (FOC) for faulty three-phase induction motor, results in a significant torque and speed oscillation. This research presented a novel method for vector control of three-phase induction motor under fault condition (two-phase open circuit fault). The proposed method for vector control of faulty machine is based on rotor FOC method. A comparison between conventional and modified controller shows that the modified controller has been significantly reduced the torque and speed oscillations.</p>

scholarly journals Switched-Capacitor Boost Converter for Low Power Energy Harvesting Applications

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3156 ◽  
Author(s):  
Miran Rodič ◽  
Miro Milanovič ◽  
Mitja Truntič ◽  
Benjamin Ošlaj
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Output Voltage ◽  
Control Algorithm ◽  
Internal Resistance ◽  
Current Control ◽  
Switched Capacitor ◽  
Thermoelectric Generators ◽  
Passive Components ◽  
And Control

The paper presents a Switched-Capacitor Boost DC-DC Converter (SC-BC) which can be used in energy harvesting applications using thermoelectric generators (TEGs) with low output voltage, low power and a significant internal resistance. It consists of a switching capacitor circuit, where MOSFETs are used as switches, and a boost stage. The converter is a modification of a previously presented scheme in which diodes are used in the switched capacitor stage. A higher voltage gain and an increased efficiency can thus be achieved. The model of the converter was developed considering the internal resistance of the TEG and boost stage inductor. A comparison with the diode based converter is shown, with consideration of the TEG internal resistance. Calculation is presented of the main passive components. A control algorithm is also proposed and evaluated. It is based on a linearization approach, and designed for output voltage and inductor current control. The operation of both converter and control are verified with the simulation and experimental results.

scholarly journals Three phase voltage source inverters with grid connected industrial application

2018 ◽  
Vol 7 (4) ◽  
pp. 18 ◽  
Author(s):  
Prakash N ◽  
Balaji V.R.
Keyword(s):  
Output Voltage ◽  
Control Algorithm ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Control Technique ◽  
Voltage Source ◽  
Phase Voltage ◽  
Nonlinear Load ◽  
Three Phase ◽  
Park Transformation

The grid-connected issue is one of the major problems in the field of Power Electronics. In this paper, the Three Phase Voltage Source Inverter (VSI) is controlled by a Space Vector Pulse Width Modulation (SVPWM) Technique. SVPWM control technique and Park transformation, the managed inverter control system to convert input DC power into AC power, stabilize the output voltage and current, and feeds the excess power to the utility grid can be achieved by controllers. Usually, the grid source contains higher level of harmonics. To analyze the harmonics, nonlinear load is connected externally in the point of common coupling. The main aim of this paper is to modeling, simulation and experimental study of the three-phase grid connected inverter. By using the control algorithm, the grid sides Total Harmonics Distortion (THD) are controlled to the 1.54% for 800V DC as per the IEEE standard. The stimulation results such as AC output voltage and current, inverter system power flow, and grid disturbances detection signals, proves the effectiveness of the developed control algorithm. The control algorithms to makes the for this inverter outputs is pure sinusoidal.

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