power factor correction Articles
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A bridgeless DIVM buck PFC rectifier with digital control and voltage doubler configuration
A new digitally controlled, bridgeless AC/DC buck converter that operates in discontinuous–input–voltage mode (DIVM) is presented. It inherits power factor correction property and draws continuous input current during conduction period. In addition, the efficiency of the proposed buck PFC rectifier is improved by adopting a bridgeless configuration. The converter also works as a voltage–doubler ...
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Power Factor correction capacitors for utilising power consumption in industrial plants
Installation of capacitor banks proved to be cost effective approach to correct power factor in industrial plants. Optimum capacitance value that contributes to the maximum PF improvement varies from one system to another. Such value depends on the existing electrical system within the industrial plant. This paper provides industrial plants operators an optimisation model to correct and improve ...
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Three–phase modular single stage full–bridge converter for switched mode power supplies
In this paper, the modular development of a three–phase single stage ac–dc power converter based on single–phase ac–dc isolated full–bridge converter for telecom power supply applications is presented. Three single–phase converter modules are series connected to form a three–phase converter system to achieve balanced three–phase currents. This paper analyses the operation of a modular converter ...
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Modelling, design and control of a SEPIC power factor corrector for single–phase rectifiers: experimental validation
In this paper, a new general case switching–function–based model is proposed for a DC–to–DC single ended primary inductance converter (SEPIC). Compared to conventional buck or boost converters, this topology allows a low current ripple at the input for a relatively low level of the DC–bus voltage. The converter is used as a power factor correction (PFC) circuit for a single–phase rectifier and, ...
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Small-signal analysis of a single-stage two-switch AC-to-DC converter
Small-signal analysis of a two-switch single-stage AC-to-DC converter is presented using the state averaging technique and low-ripple approximation. Based on the state equations for different intervals of operation, averaged state equations are derived. The averaged state equations for the boost inductor current and tank inductor current are zero leaving only three average state equations ...
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An improved power quality boost–flyback SSIPP fed BLDC motor drive
This paper presents a single–stage isolated power factor corrected power supply (SSIPP) fed permanent magnet brushless DC (BLDC) motor drive. An advantage of fast voltage regulation with single voltage control loop of SSIPP is utilised to develop a power factor correction (PFC) based BLDC motor drive. The speed of BLDC motor is controlled by varying the DC link voltage of the voltage source ...
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Zero voltage transition isolated PWM push pull boost converter for single stage power factor correction application
Current-fed pulse width modulated (PWM) single stage push pull boost converter is proposed. The converter operates with zero voltage switching (ZVS). A simple auxiliary circuit which includes only one active switch provides ZVS operation to all switches, leading to reduced switching losses in the converter. The converter core can be transparently embedded inside current mode power factor ...
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Active waveshaping of AC mains current in direct torque-controlled permanent magnet synchronous motor drive
This paper deals with the power quality improvement of AC mains in Direct Torque-Controlled (DTC) permanent magnet synchronous motor (PMSM) drive using active wave shaping techniques. For this purpose, different topologies for active wave shaping of AC mains current in DTC-based PMSM drive such as single- and two-switch boost power factor correction (PFC) AC–DC converter, asymmetrical two-switch ...
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Design, analysis and control of compensators for distribution power systems
This paper deals with the analysis, design and control of Distribution Static Compensator (DSTATCOM) for power quality improvement in an AC distribution system. Various design criteria are considered for the design of DSTATCOM for a variety of possible functions such as voltage regulation, power factor correction and load balancing. Conventional AC power capacitors are considered in conjunction ...
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New topology for management of bi-directional power flow between vehicle and grid with reduced ripple current at unity power factor
In this paper, a new topology of single-phase pulse width modulated (PWM) AC-DC converter is proposed for bidirectional power flow between plug-in hybrid electric vehicle (PHEV) and the grid. This converter consists of a PWM voltage source converter (VSC) and a ripple reduction circuit. The ripple reduction circuit consists of a switching leg and an inductor. The inductor is connected between ...
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Modelling of DSTATCOM for distribution system
This paper deals with the simulation of distribution static synchronous compensator (DSTATCOM) for improving power quality of a distribution system feeding linear as well as non-linear loads. Nowadays, there are an increasing number of non-linear loads which inject harmonics into the system. A three-phase insulated gate bipolar transistor- (IGBT-)based current controlled voltage source inverter ...
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A three-phase uninterruptible power supply with an adaptive reference waveform generator
In this paper, a new digital deadbeat controller along with a modified adaptive reference signal generator are designed, implemented and applied to a three-phase series-parallel line-interactive uninterruptible power supply (UPS). This kind of UPS system provides input power factor correction, output voltage conditioning with higher efficiency compared with other kinds of UPS. It consists of a ...
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MATLAB-based modelling of Distribution STATCOM applied to isolated power system
This paper presents the modelling of Distribution Static Compensator (D-STATCOM) used in isolated power systems. The model of D-STATCOM is developed using Power System Block-set (PSB) and Simulink toolboxes of standard MATLAB software. Two proportional integral PI controllers are used to control DC bus voltage and AC bus voltage regulation at the point of common coupling. Results are presented ...
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Analysis and design of single-phase power factor-corrected AC–DC Cuk converter with high-frequency isolation
In this paper, an analysis and design of a high-frequency transformer isolated single-phase buck-boost AC–DC Cuk converter is presented for both discontinuous and continuous conduction modes (DCM and CCM) of operation. Both modes of operation are considered for the design of 2.6-kW rating with high-level steady-state and dynamic performance. A comparative analysis of Cuk converter is also ...
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Star-hexagon transformer and non-isolated three-leg VSC based three-phase four-wire DSTATCOM
A new three-phase four-wire DSTATCOM (distribution static compensator) is proposed for power quality improvement in the distribution system. The DSTATCOM is based on a star/hexagon transformer and three-leg VSC (voltage source converter). It compensates harmonic current, reactive power and balances the load along with neutral current compensation. Each of the three single phase transformers has ...
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Power quality improvement in HVDC systems using 18-pulse voltage source converter
This paper deals with the modelling, control and design of 18-pulse voltage source converters (VSCs) for high voltage DC (HVDC) transmission system with power quality improvement. A two-level VSC is used to realise an 18-pulse VSC operation with minimum switching loss. The performance of the VSC system is improved in terms of reduced harmonics level at fundamental frequency switching (FFS). The ...
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Bridgeless single stage flyback converter–based computer power supply
A power factor corrected (PFC) bridgeless converter–based computer power supply (CPS) using multioutput flyback dc–dc converter is presented in discontinuous conduction mode (DCM) of operation. In place of the conventional diode bridge to convert ac voltage into uncontrolled dc voltage, two multioutput flyback converters are connected in anti–series across the single phase ac supply. The diode ...
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Growth for the all-round power supply – Siemens extends its portfolio of power supply units to include 3-phase devices
At the fair Smart Production Solutions (SPS) 2019, Siemens is presenting new 3-phase 24-volt power supply units within its Sitop PSU6200 product line, extending the scope of application of its standard power supplies. The new power supply units in the Sitop PSU6200 series supply a rated output current of 5, 10 or 20 amperes (A), extending the previous scope of application on one phase to ...
By Siemens AG
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Study, modelling and control of a single-phase power factor corrector based on the Sheppard-Taylor topology
In this paper, a single-phase power factor corrector (PFC) based on the Sheppard-Taylor topology is studied. A novel mathematical representation of the converter is elaborated using the state-space averaging technique. In order to emphasise the usefulness of such model, three pulse-width-modulated (PWM) multi-loops control schemes are proposed and developed in the aim of ensuring a unity power ...
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Capacitor application issues
Abstract - Capacitors provide well-known benefits to electric power systems. These benefits include power factor correction, voltage support, release of system capacity, and reduced system losses. As with any piece of electrical equipment, there are a number of application issues that engineers need to be aware of. These issues range from the very basic to the very complex. Most of these ...
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