Power Factor 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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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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Analysis, design and control of a two stage improved power quality telecommunication power supply
This paper deals with the power quality improvement at the utility interface of a telecommunication switched mode power supply (SMPS) of 12 kW rating. The first stage of this SMPS consists of a 6–pulse diode bridge converter that performs ac–dc conversion yielding an unregulated dc voltage. In the second stage, two boost rectifiers are connected together which feed to a boost dc–dc full bridge ...
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A novel study for constant voltage and frequency operation of self–excited short–shunt induction generator
This paper presents an analytical technique for selecting the optimal shunt and series capacitances required for maintaining constant load voltage and frequency of a self excited short shunt induction generator (SESSIG). The study investigates the performance of the SESSIG at different operating conditions, such as speed of the prime mover, load impedance and load power factor. The required ...
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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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Minimisation of VA loading of UPQC in three–phase four–wire distribution system
Unified power quality conditioner (UPQC) is a combination of series and shunt active power filters with a common DC link. This device is used to enhance power quality by injecting required amount of Volt–Ampere (VA) into the system. In view of the cost effectiveness, it is desirable to have VA loading of UPQC without compromising the compensation capability. This paper presents a methodology to ...
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An efficient current regulator for a power conditioner operated by an innovative strategy
This paper presents an innovative implementation of the recursive Gauss-Newton (GN) algorithm for extraction of the common current quality problems such as the current harmonics and current fluctuation. This paper introduces also the utilisation of the adaptive notch filters to efficiently track the unknown frequencies of the current disturbances. The paper exhibits the mitigation results for ...
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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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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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Neural network-based shunt active filter with direct current control for power quality conditioning
In this paper, a novel phase locked loop less control algorithm for harmonic and reactive power compensation with power factor improvement using three-phase shunt active power filter under non-ideal mains voltage conditions is presented. The performance of APF mainly depends upon how quickly and accurately compensation signal are estimated. The artificial neural network trained with conventional ...
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Classification and comparison of interfacing schemes for connecting fuel cells to a single-phase utility line
Based on a systematic classification of dc source to utility interfacing schemes, this paper presents six major interfacing schemes for connecting fuel cells to a single-phase utility line using high-frequency transformer isolated power converters. The operation, advantages and disadvantages are discussed for each scheme with examples and operating waveforms. Several features e.g., utility line ...
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Direct power control of the PWM rectifier using sliding mode control
This paper presents the analysis and design of the direct power control of a boost PWM rectifier based on sliding mode control. In the aim to improve control performance of the rectifier, the proposed approach combines the merits of sliding mode control, direct power control and space vector modulation. The resulting control scheme is able to drive the output dc voltage to the desired value while ...
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Energy Management Contract
1. Introduction Energy management contract (EMC) is a new market-oriented energy saving mechanism. It is not to market a product or a technology, but a financial management method to reduce the energy costs. EMC companies provide the customers with a complete set of energy saving services, including energy auditing, project design & financing, engineering construction, equipment ...
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Thermo-economic efficiency of low capacity coal-based power plants
The method of estimation of thermo-economic factors, allowing the justification of the construction of low capacity coal-based power plants has been developed in the present paper. The C-curve method applied for thermo-economic analysis is used here for determination of the optimal ratio between specific exergetic and cost-performance factors. The results of the analysis show that for coal-based ...
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Energy and exergy assessments for potential wind power in Turkey
The main objective of the study is to estimate wind power potential of Turkey and provide suitable data for evaluating potential wind power by using the wind data collected at 23 different wind-monitoring stations. In this study, energy and exergy analyses of wind power are used to estimate wind power potential in these areas. Exergy analysis of wind power is investigated according to air ...
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Comparative control analysis of the Vienna rectifier based on its averaged model
This paper presents a comparative evaluation of two multiple-loops duty-cycle-based control schemes applied to a three-phase three-switch three-level boost-type rectifier. The control laws are both elaborated on the basis of a state-space averaged model of the converter, expressed in the synchronous rotating frame. On the one hand, a control scheme that uses linear regulators is designed by using ...
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Simulation-based evaluation of tidal current power output characteristics
Tidal current is considered to be one of the promising alternative green energy resources. This paper introduces a simulation based methodology to evaluate tidal current power output characteristics, including capacity factor, and power production variability patterns. Power variability analysis is crucial to grid integration systems design. The proposed methodology is applied to the well known ...
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Non-isolated single stage PFC rectifier for wide-input large step-down voltage applications
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input ...
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Are inverters PV’s Achilles Heel?
The organizers of the Utility Scale PV Yield Optimization Conference & Expo, gained exclusive access with Michael Levi, Senior Director Worldwide Marketing from Satcon to talk about the inverter market for utility solar projects, how they are positioning themselves in a competitive market and how reliable are these key components. Q1: What segment of the solar market are you targeting? ...
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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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