Triple loop modulation (tlm) for high reliability and efficiency in a power factor correction (pfc) system
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The document proposes a triple loop modulation (TLM) technique for power factor correction (PFC) systems that improves reliability and efficiency. TLM can automatically adjust bandwidth to rapidly increase or decrease inductor current, shortening transient response time. This improves reliability when dealing with output load variations. Testing showed the TLM technique achieved a high power factor of 99%, efficiency of 95%, and power capability of 90W, with transient response improved twofold over conventional PFC designs.
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Similar to Triple loop modulation (tlm) for high reliability and efficiency in a power factor correction (pfc) system
Low frequency ac transmission for power systems by Aamir Saleem
Voltage instability is one of the major issue in
HVAC power network operating at 50 Hz frequency due to
limited power transfer capability and distance limit. The stable
operation of power system must be kept within limits to
increase the efficiency of power transmission system. In this
research Low Frequency AC (LFAC) transmission system has
been proposed as a new power transmission technology to
reduce the losses of transmission network and controlling the
reactive power using Flexible AC transmission device. A
LFAC Transmission lines operates at 16.7Hz frequency for
transmission of power from source to load and use two
Frequency converters at source and load side. The normal
operation of power system depends on the reactive power
flowing through the power transmission lines, which can be
adjusted by a flexible AC transmission device; Static
synchronous compensator. LFAC transmission lines with
STATCOM controller improve the Power system voltage
stability under various disturbances and enhance the power
transmission capability as compare to HVAC transmission.
The simulations are done in Matlab Simulink 2017a .The
Output of Matlab Simulink model shows that voltage will
become Stable and reactive power is compensated for best
performance for power system.
THD ANALYSIS OF LFAC TRANSMISSION SYSTEM
This paper deals with the design of filters and THD analysis of a low - frequency ac (20Hz) transmission system. The LFAC system is interfaced with the 50Hz main power grid with a cycloconverter. The wind power is collected in dc form,and is connected to the L FAC transmission line with a twelve pulse inverter. The waveforms at the sending end and receiving end of the transmission line are plotted.THD analysis of LFAC system is carried out. The circuit model of LFAC system is simulated in MATLAB/SIMULINK.
PERFORMANCE OF LFAC TRANSMISSSION SYSTEM FOR TRANSIENT STATE
This paper deals with the transient performance of a low - frequency ac (20Hz) transmission system for a wind ramp event . The LFAC system is interconnected with the 50Hz grid with a Cycloconverter . The wind power from the offshore is in the form of dc,and is interconnected to the LFAC transmission line with a twelve - pulse thyristor inverter. The graphs of transient response of proposed system parameters are plotted. The circuit model of LFAC system is simulated in MATLAB/SIMULINK.
LOW VOLTAGE LOW DROPOUT REGULATOR USING CURRENT SPLITTING TECHNIQUE
We proposed a low voltage low dropout regulator that converts an input of 1 v to an
output of 0.85-0.5 v with 90-nm CMOS technology. Current splitting technique used to boost the
gain by using an error amplifier. A power noise cancellation mechanism is formed in the rail-to-rail
output stage of the error amplifier, to minimize the size of power MOS transistor. In this paper we
achieve a fast transient response, high power supply rejection, low dropout regulator, low voltage,
and small area. CMOS processes have been used in Large scale integrated circuits like LSI and
microprocessor they have been miniaturized constantly. Taking full advantage of the miniaturization
technology, CMOS linear regulators have become the power management ICs that are widely used in
portable electronics products to realize low profile, low dropout, and low supply current.
December 2015 Online Magazine 39-42
The document describes a proposed low-voltage low-dropout (LDO) regulator using 90-nm CMOS technology. It converts an input of 1V to an output of 0.85-0.5V. Key features include a simple operational transconductance amplifier as the error amplifier with current splitting to boost gain and bandwidth. A power noise cancellation mechanism minimizes the power transistor size. A fast transient accelerator provides extra current during load transients. The proposed LDO achieves high efficiency, small output variation, and high power supply rejection while occupying a small area of only 0.0041 mm2.
Published_Paper_TCASI
This document summarizes a research paper that proposes a new Flipped Voltage Follower (FVF) low-dropout (LDO) voltage regulator using a Dual-Summed Miller Frequency Compensation (DSMFC) technique. The proposed LDO regulator can stabilize a load capacitance ranging from 10pF to 10nF using only 8pF of total compensation capacitance. Simulation results show the regulator maintains stability across the wide load capacitance range under varying load currents. The DSMFC technique improves stability compared to single Miller compensation, especially for large load capacitances with low load currents, large capacitances with moderate currents, and small capacitances with low currents. This allows the proposed regulator to
digital
This document compares different control schemes for switch mode power supplies, including PWM voltage mode control, current mode control, and hysteretic mode control. It summarizes that hysteretic control provides the fastest transient response to load changes because it does not require compensation, has a duty cycle range from 0-100%, and reacts within a single switching cycle. Voltage mode control has a slower response due to limitations of its compensation network and double pole output filter. Current mode control has better performance than voltage mode but hysteretic control can still respond faster due to its lack of feedback loop.
Design and implementation of a series switching SPSI for PV cell to use in ca...
This document describes the design and implementation of a series switching single-phase synchronous inverter (S-PSI) for use with photovoltaic cells in a carrier-based grid synchronous system. A carrier-based grid synchronous controller is designed using pulse width modulation to operate the inverter switches. The inverter is designed to output 230V AC at 50Hz from a 340V DC input. Grid filters are used to convert the output waveform to sinusoidal and reduce harmonics. Simulation and experimental results show the proposed design achieves 97.02% efficiency with a 55% reduction in phase error and 11% reduction in total harmonic distortion.
Design and Simulation of PFC Circuit for AC/DC Converter Based on PWM Boost R...
This document describes the design and simulation of a power factor correction (PFC) circuit for an AC/DC converter using a PWM boost regulator. Non-linear loads draw non-sinusoidal current from the power supply, reducing power quality. The proposed PFC circuit utilizes current shaping techniques with the boost inductor to generate a sinusoidal input current and improve the power factor. Simulation results showed the input current was sinusoidal in phase with the line voltage, achieving near unity power factor. Harmonic analysis revealed the 3rd, 17th, and 19th harmonics were significantly reduced after PFC, improving the power factor from 62.3% to 98.8%. The PFC circuit demonstrated effective mitigation of current harmon
Ap35235240
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Apf Cpresentation
The document discusses power factor correction and automatic power factor correction (APFC) systems. It explains that power factor is the ratio of active power to apparent power and can be lagging or leading. Low power factor causes inefficient energy use and other issues. APFC systems automatically switch capacitor banks to maintain a high power factor under varying loads without manual intervention. This prevents issues like overvoltage and penalties compared to fixed capacitor compensation. The document provides details on components, control, and benefits of APFC systems.
TCSC
This document discusses using a Thyristor Controlled Series Capacitor (TCSC) to enhance power system stability. It first reviews power system stability concepts like steady state, transient, and dynamic stability. It then discusses factors limiting transmission line loading capacity and introduces Flexible AC Transmission Systems (FACTS) technology. The document focuses on TCSC, explaining its working principle and applications. It presents simulation results in MATLAB showing that TCSC improves stability performance and dampens power oscillations under different loading conditions like light, nominal, and heavy loads. The conclusion is that TCSC effectively enhances power system stability.
Capacitor
This document discusses power factor correction and automatic power factor correction (APFC) systems. It explains that power factor is the ratio of active power to apparent power and can be lagging or leading. Low power factors are caused by inductive loads and non-linear loads. APFC systems use capacitors in automatic steps controlled by a microprocessor to maintain a high power factor under varying loads without manual intervention or risk of overvoltage. This improves efficiency and reduces utility penalties and equipment loading and sizes. The document provides specifications for capacitor selection and switching equipment for APFC systems.
automatic power factor controller
This document discusses power factor correction and automatic power factor correction (APFC) systems. It explains that power factor is the ratio of active power to apparent power and can be lagging or leading. Low power factors are caused by inductive loads and non-linear loads. APFC systems use capacitors in automatic steps controlled by a microprocessor to maintain a high power factor under varying loads without manual intervention or risk of overvoltage. This improves efficiency and reduces utility penalties and equipment loading and sizes. The document provides specifications for capacitor selection and switching equipment for APFC systems.
power quality improvement in distrution system using D statcom
The document discusses using a D-STATCOM device to improve power quality issues in distribution systems, such as voltage sags, harmonic distortion, and low power factor. A D-STATCOM injects current into the system using a voltage source converter to regulate voltage and mitigate sags. It can also absorb or generate reactive power to improve power factor and eliminate current harmonics. Simulation results showed the D-STATCOM is effective at mitigating voltage sags and improving power factor when combined with an LCL passive filter.
Highly efficient Active Front End enables trouble free operation of low harmo...
NEW 3 level Active Front End (AFE) technology from Schneider Electric allows trouble free operation, both for mains supply side and motor side.
This technology allows exceptional low harmonics impact on the main side, which helps to protect other assets while saving energy. It also solves the major issue existing with 2 level AFE which can create premature wear on motors' bearings. By suppressing the common mode voltage, the 3 level AFE technology ensures the motor is running without potential issue, extending the motor’s lifetime and saving maintenance costs.
power factor controlling using intregarted device controller
The document describes a Power Factor Controller (PFC) which is an integrated power quality device for power distribution systems and industrial circuits. A PFC integrates capacitor banks and switching breakers into a compact design with sensors and control units. It provides more accurate voltage control and power factor correction than traditional switched capacitor banks. The PFC offers advanced functions like minimizing capacitor switching transients and protecting against potential harmonic resonance issues.
BP_2010_05_High Eff Low Profile ACDC Power_SMappus May 2010_Edit SM
Maximizing efficiency in low-profile power supply designs is challenging. A 300W, 1.75" high power supply design uses an interleaved dual boundary conduction mode power factor correction stage followed by an asymmetrical half-bridge DC-DC converter to achieve over 90% efficiency. Careful component selection, topology choice, and control scheme optimization are required to meet the goals of high efficiency over a wide load range while minimizing size and heat sinks in the power supply's restricted form factor.
Flexible AC Transmitter by using TSR.pptx
This document describes a flexible AC transmission system (FACTS) that uses thyristor switched reactors (TSR) to compensate for voltage amplification that occurs during low or no load conditions. The system monitors the transmission line voltage and current and uses a microcontroller to automatically connect shunt inductors across the line when needed to regulate the voltage. It aims to control power flows, improve transmission capacity and stability, and reduce losses.
Similar to Triple loop modulation (tlm) for high reliability and efficiency in a power factor correction (pfc) system (20)
Low frequency ac transmission for power systems by Aamir Saleem
Low frequency ac transmission for power systems by Aamir Saleem
PERFORMANCE OF LFAC TRANSMISSSION SYSTEM FOR TRANSIENT STATE
PERFORMANCE OF LFAC TRANSMISSSION SYSTEM FOR TRANSIENT STATE
LOW VOLTAGE LOW DROPOUT REGULATOR USING CURRENT SPLITTING TECHNIQUE
LOW VOLTAGE LOW DROPOUT REGULATOR USING CURRENT SPLITTING TECHNIQUE
Design and implementation of a series switching SPSI for PV cell to use in ca...
Design and implementation of a series switching SPSI for PV cell to use in ca...
Design and Simulation of PFC Circuit for AC/DC Converter Based on PWM Boost R...
Design and Simulation of PFC Circuit for AC/DC Converter Based on PWM Boost R...
power quality improvement in distrution system using D statcom
power quality improvement in distrution system using D statcom
Highly efficient Active Front End enables trouble free operation of low harmo...
Highly efficient Active Front End enables trouble free operation of low harmo...
power factor controlling using intregarted device controller
power factor controlling using intregarted device controller
BP_2010_05_High Eff Low Profile ACDC Power_SMappus May 2010_Edit SM
BP_2010_05_High Eff Low Profile ACDC Power_SMappus May 2010_Edit SM
Triple loop modulation (tlm) for high reliability and efficiency in a power factor correction (pfc) system
- 1. TRIPLE LOOP MODULATION (TLM) FOR HIGH RELIABILITY AND EFFICIENCY IN A POWER FACTOR CORRECTION (PFC) SYSTEM ABSTRACT: The proposed triple loop modulation (TLM) can ensure reliability of the power factor correction (PFC) system due to the improvement of transient response. In conventional design, low bandwidth of less than 20 Hz that rejects ac source of 60/120 Hz coupling deteriorates system reliability in case of output load variation. Contrarily, the proposed TLM can automatically adjust bandwidth to rapidly increase or decrease inductor current to shorten transient response time. Besides, in the steady state, system stability can be guaranteed by low-frequency compensation pole without being affected by the TLM. The test circuit fabricated in a VIS 500 V UHV laterally diffused metal-oxide-semiconductor transistor process demonstrates that the highly integrated PFC controller with the proposed TLM has high power factor of 99%, high efficiency of 95%, and high power driving capability of about 90 W. The improvement in transient response is twofold faster than in conventional PFC design with output load variation from 90 to 20 W and vice versa.