Improved Power Quality Converter Research Articles

Design and Analysis of Novel Three-Phase PFC for IM Drives

Induction motor drives (IMDs) can achieve high performance levels comparable to dc motor drives. A major problem in getting high dynamic performance in an IMD is the coupling between the flux and torque producing components of stator current. This is successfully overcome in FOC (Field-Oriented Control) IM, making it to the industry standard control. The performance of an IMD with an improved power quality converter at the front end is presented in this study. In the IMD, boost converter is employed to reduce power quality difficulties at the utility interface. As the boost converter contains only one switch, it results in a low processing time and cost. To ensure sinusoidal supply currents with high PF (Power Factor) and minimal THD (Total Harmonic Distortion), a novel PFC (Power Factor Corrector) control technique is proposed. To enhance the performance of the converter and to lower distortions at the motor side, PI (Proportional Integral) controller is incorporated at the PFC side. Thus it controls the DC bus voltage. The proposed boost converter improves power quality by lowering overall harmonic distortion of AC mains current, improving power factor correction, and regulating dc-link voltage. It is designed, modelled, and simulated in the MATLAB/simulink platform. Using a DSP (Digital Signal Processor), the suggested system’s performance is experimentally validated. The system’s performance is evaluated for speed and load torque, and the power quality indices are determined to meet IEEE-519 standards under all operating conditions. From the obtained results, it is evident that the proposed system mitigates the power quality issues effectively.

Review of Power Factor Correction (PFC) AC/DC-DC Power Electronic Converters for Electric Vehicle Applications

This article fully discusses the general review on power factor correction of single-phase AC/DC-DC power electronic converters for electric vehicle applications. To magnify power quality in the declaration of Power Factor Correction (PFC) make the proposal of assorted for demand of solid-state DC-DC converters. These converters are look forward to minimize the Total Harmonic Distortion (THD) at the both input and output side and then to synchronize the DC voltage in DC-DC converters representation of both Uni/Bi-Directional power flow are analyzed. A complete review of Improved Power Quality Converter (IPQC) configuration, design feature, and specific value of selection are presented in this paper. The battery charger necessity to have a converter flow of power ability, a solution needs for an on/off-board charger of an Electric Vehicles (EVs).Due to high power density and efficiency, a DC-DC converters is preferred for medium power and high voltage applications, the most attractive feature of DC-DC converters that makes it suitable for handling medium power supplies is its soft-switching capability. This paper is aimed to research, design and to improve the working applications on clean energy and smart grid field.

Improved power quality converter for three‐phase grid‐interfaced PV array fed reduced current sensor‐based induction motor drive for water pumping

Improved power quality converter for three‐phase grid‐interfaced PV array fed reduced current sensor‐based induction motor drive for water pumping

Comparative Analysis and Performance Investigation Of Single-Phase Improved Power Quality Converter

Comparative Analysis and Performance Investigation Of Single-Phase Improved Power Quality Converter

Analysis of PV Cell-based DG involving Improved Power Quality Converter for voltage control

The research investigated the impact on the power system with an extensive penetration of photovoltaic (PV) generation. A model of PV generation suitable for studying its interactions with the power system was developed. The dynamic response of a PV generation system to rapid changes in irradiance was investigated. An aggregated model of grid-connected PV generation was built, and it was used for simulating the integration of PV generation on a large-scale. Voltage control technique was investigated by simulation. Distributed Generation (DG) units are connected to the grid increasing nowadays for several reasons. Most DG units are relatively small and connected to the distribution network. A large part of the DG units connected to the grid via power electronic converters. The main task of the converters is to convert the power that is available from the prime source to the correct voltage and frequency of the grid. The general objective of this paper is to investigate how the power electronic converters can support the grid and solve power quality problems. An IEEE-5 bus system considered for this work to validate the power electronic converter using MATLAB/ Simulink.

A novel adaptive control approach for three-phase improved power quality converter under distorted and unbalanced AC mains

In this paper, a novel simplified control technique is proposed to control three-phase improved power quality converter for disturbed AC mains. The proposed technique is based on retransformation of Clarke transformation. The trajectory of reference vector is very important for SVM technique to obtain exact switching times. Due to disturbed supply in a three-phase system, the trajectory of reference vector gets affected which results in low input power factor, high input current THD and high ripple factor of the DC output voltage in power converters. In the proposed technique, PI operation is implemented for the retransformation of Clarke transformation. The modified Clarke transformation generates a required shape of the trajectory of reference vector so that the system performs satisfactorily even under disturbed AC mains. Moreover, the proposed scheme has the advantage of fast response and is simple enough to be implemented in a single-chip microcontroller. The simulation results are presented to demonstrate the effectiveness of the new proposed control technique.

Power Quality Improvement in Three-phase Telecommunication Power Supply System

This article proposes power quality improvement in a three-phase AC mains-fed telecommunication power supply by using an improved power quality converter. Conventional telecommunication tower power supplies suffer from power quality problems, such as high input current harmonic distortion, low power factor, and voltage distortions at the utility interface. To mitigate these problems, modern AC-DC converters with power factor correction circuits are used at the utility interface. An integrated boost converter is used as a power factor corrector with an isolated DC-DC converter at the load end to form the proposed telecommunication power supply. The power factor correction converter mitigates the harmonic contents of the AC mains current and improves the power factor, whereas the isolated converter provides regulated load voltage and isolation. Voltage control is used for regulating the DC voltage of the isolated converter, while the power factor correction integrated boost converter employs a current control loop to shape input current to sinusoidal in-phase with voltage. The design, modeling, and simulation results are presented to demonstrate the effectiveness of the power supply at various AC mains voltages and loads. A prototype of the front-end converter is developed, and recorded test results are presented here to validate the simulated performance.

Neural‐network‐based space‐vector pulse‐width modulation for capacitor voltage balancing of three‐phase three‐level improved power quality converter

In this study, an artificial neural-network (ANN)-based space-vector pulse-width modulation (SVPWM) for capacitor voltage balancing of a three-phase three-level neutral-point clamped converter with improved power quality is presented. The neural-network-based controller offers the advantage of very fast implementation of the SVPWM algorithm. This makes it possible to use an application specific integrated circuit chip in place of a digital signal processor. The proposed scheme employs single layer feed-forward neural-networks at different stages along with a control algorithm using modified reference vector for capacitor voltage balancing of an improved power quality three-phase neutral-point clamped converter. In other words, the neural-network receives three-phase voltages and currents as input and generates symmetrical pulse-width modulation waves for three phases of the converter. A simulated digital signal processor (DSP)-based modulator generates the data which are used to train the network by a back-propagation algorithm in the MATLAB Neural Network Toolbox. The simulation of converter with ANN-based space-vector modulator shows excellent performance when compared with that of conventional DSP-based modulator.

Single Stage Single Switch Power Supply (S4PS)Design for Low Power HB-LED Lighting

Abstract This paper presents an improved power quality converter (IPQC)-based power supply design for high brightness light emitting diode (HB-LED) low power lighting. The IPQC circuit uses a Cuk buck-boost converter to operate it in a discontinuous conduction mode (DCM) using the voltage follower technique for the mitigation of harmonic contents present in the AC mains current. Subsequently, reduction in harmonic contents results in improving the power quality indices at the AC mains. Single-stage single switch converter topology is used, which has less component count, size and cost as compared to the two-stage converter topology. DCM operation has an advantage that only output voltage control loop is required as compared to three control loops required in the continuous conduction mode operation. An 18-W LED driver is designed, modeled and simulated using MATLAB/Simulink software for 220 V, 50 Hz AC mains. The performance of the proposed LED driver is observed in terms of total harmonic distortion of the input current (THDi), input power factor (PF) and crest factor (CF) taking into account the strict international standard of IEC 61000-3-2 for class C equipments.

Improved power quality converter for direct torque control‐based induction motor drives

This study presents the performance of a direct torque control (DTC)-based induction motor drive (IMD) with improved power quality converter at the front end. It is designed, modelled, simulated in MATLAB/simulink platform and implemented in hardware using a digital signal processor (DSP). An improved power quality converter known as Vienna rectifier is used in the system to mitigate the power quality problems at the utility interface in the DTC-IMD. The proposed Vienna rectifier is a three switch converter to improve the power quality in terms of reduced total harmonic distortion of ac mains current, power factor correction and dc-link voltage regulation. The performance of the proposed system is validated experimentally using a DSP. The performance of the system is tested for step change in input reference speed and the load torque and it is found that the power quality indices conform to IEEE-519 standard under all operating conditions.

A Review of Three-Phase Improved Power Quality AC–DC Converters

Solid-state switch-mode rectification converters have reached a matured level for improving power quality in terms of power-factor correction (PFC), reduced total harmonic distortion at input AC mains and precisely regulated DC output in buck, boost, buck-boost and multilevel modes with unidirectional and bidirectional power flow. This paper deals with a comprehensive review of improved power quality converters (IPQCs) configurations, control approaches, design features, selection of components, other related considerations, and their suitability and selection for specific applications. It is targeted to provide a wide spectrum on the status of IPQC technology to researchers, designers and application engineers working on switched-mode AC-DC converters. A classified list of more than 450 research publications on the state of art of IPQC is also given for a quick reference.

04/01528 Improved power quality converter fed permanent magnet AC motor for air-conditioning: Singh, B. et al. Electric Power Systems Research, 2003, 65, (3), 239–245

04/01528 Improved power quality converter fed permanent magnet AC motor for air-conditioning: Singh, B. et al. Electric Power Systems Research, 2003, 65, (3), 239–245

Improved power quality converter fed permanent magnet AC motor for air-conditioning

This paper presents the performance analysis of interior permanent magnet synchronous motor (IPMSM) fed from improved power quality converter–inverter system as a variable speed drive for air-conditioning (Air-Con). The improved power quality converter (IPQC) makes the input power factor unity and also reduces the total harmonic distortion (THD) of input supply current. This converter consists of two uncontrolled unidirectional and two bi-directional switches. It provides constant DC-link voltage during transient and steady state conditions. This converter has high efficiency as only two switches conduct at a time and IPMSM also offers high efficiency as compared to other electric motors. The proposed drive system is an appropriate solution for energy conservation in the AC distribution system, in the motor and in the compressor of Air-Con. The detailed model and the simulated results of the proposed drive system are presented to demonstrate the features of improved power quality and energy conservation.