Wednesday, 30 July 2014

A Flexible AC Distribution System Device for a Microgrid


This paper presents a flexible ac distribution system device for microgrid applications. The device aims to improve the power quality and reliability of the overall power distribution system that the microgrid is connected to. The control design employs a new model predictive control algorithm which allows faster computational time for large power systems by optimizing the steady-state and the transient control problems separately. Extended Kalman filters are also employed for frequency tracking and to extract the harmonic spectra of the grid voltage and the load currents in the microgrid. The design concept is verified through different test case scenarios to demonstrate the capability of the proposed device and the results obtained are discussed.

Improved Active Power Filter Performance for Renewable Power Generation Systems

An active power filter implemented with a four-leg voltage-source inverter using a predictive control scheme is presented. The use of a four-leg voltage-source inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase nonlinear loads. A detailed yet simple mathematical model of the active power filter, including the effect of the equivalent power system impedance, is derived and used to design the predictive control algorithm. The compensation performance of the proposed active power filter and the associated control scheme under steady state and transient operating conditions is demonstrated through simulations and experimental results.

Neuro-Fuzzy Based Speed Controller For Permanent Magnet Synchronous Motor


The conventional Proportional-Integral (PI) speed control has been widely used in industrial motor controls due to its capabilities in controlling linear plants. However, motor behaves as non-linear plant where the PI speed control may not be able to provide precise speed responses. With the fast growing of artificial intelligent in motor controls, the fuzzy logic and Adaptive Network Fuzzy Inference system (ANFIS) is available in more precise motor controls. Nevertheless, there are still many disputes on the superiority of PI and fuzzy logic controls. The fuzzy logic controller with rules-based is limited to a particular load torque due to its output membership functions, on the other hand, PI controller has better adaptability over load torque variation and has a smaller steady-state error even though it incurs the overshoot and has longer settling time. In this paper, a comparative analysis of PI, fuzzy logic, and ANFIS has done in the MATLAB SIMULINK environment

Design, Development & Simulation of Fuzzy Logic Controller to Control the Speed of Permanent Magnet Synchronous Motor Drive System

The paper presents  the detailed modelling by fuzzy logic controller (FLC) for  permanent magnet synchronous motor derive system in Simulink, the simulation includes all realistic components of the system, which enables the calculation of current and voltages in different parts of the invertors and motor under transients and steady state condition. The fuzzy logic controller is used for speed control of this type of motor. The dynamic response of (PMSM) with the proposed controller is studied under different load disturbances. The effectiveness of the proposed fuzzy logic controller is compared with that of the conventional PI & PID controllers. The proposed controller is used in order to overcome the nonlinearity problem of PMSM and also to achieve faster settling response.

Wednesday, 11 June 2014


1) Soft-Switching Bidirectional Isolated Full-Bridge Converter With Active and Passive Snubbers
2) DC/DC Buck Power Converter as a Smooth Starter  for a DC Motor based on a Hierarchical Control
3) An Adjustable-Speed PFC Bridgeless Buck–Boost Converter-Fed BLDC Motor Drive
4) A Novel Single-Phase AC-AC Converter for Circuit Breaker Testing Application
5) New ZVS DC–DC Converter With Series-Connected Transformers to Balance the Output Currents
6) High-Voltage Gain Boost Converter Based on Three-State Commutation Cell for Battery Charging Using PV Panels in a Single Conversion Stage
7) Current Control Methods for an Asymmetrical Six-Phase Induction Motor Drive
8) An Analytical Steady-State Model of LCC type Series–Parallel Resonant Converter With Capacitive Output Filter
9) Fast Transient Boundary Control and Steady-State Operation of the Dual Active Bridge Converter Using the Natural Switching Surface
10) Active Harmonic Filtering Using Current-Controlled, Grid-Connected DG Units With Closed-Loop Power Control
11) New Extendable Single-Stage Multi-input DC–DC/AC Boost Converter
12) Efficiency Optimization Through Current-Sharing for Paralleled DC–DC Boost Converters With Parameter Estimation
13) Optimal Trajectory Control of LLC Resonant Converters for LED PWM Dimming
14) Closed-Loop Control of DC–DC Dual-Active-Bridge Converters Driving Single-Phase Inverters
15) A Half-Bridge LLC Resonant Converter Adopting Boost PWM Control Scheme for Hold-Up State Operation
16) Improved Active Power Filter Performance for Renewable Power Generation Systems
17) An Optimal Minimum-Component DC–DC Converter Input Filter Design and Its Stability Analysis
18) High Efficiency Resonant DC/DC Converter Utilizing a Resistance Compression Network
19) New Bidirectional Intelligent Semiconductor Transformer for Smart Grid Application
20) Analysis and Design of a New Soft-Switching Boost Converter With a Coupled Inductor
21) A New LLC Series Resonant Converter witha Narrow Switching Frequency Variation andReduced Conduction Losses
22) Virtual Quadrature Source-Based Sinusoidal  Modulation Applied to High-Frequency Link Converter Enabling Arbitrary Direct AC-AC Power Conversion
23) Single-Stage Multistring PV Inverter With an Isolated 24) High-Frequency Link and Soft-Switching Operation
24) Modeling of the High-Frequency Rectifier With 10-kV SiC JBS Diodes in High-Voltage SeriesResonant Type DC–DC Converters
 25) Improved Instantaneous Current Control for High-Power Three-Phase Dual-Active Bridge VDC–DC Converters
26) System Integration and Hierarchical PowerManagement Strategy for a Solid-State TransformerInterfaced Microgrid System
27) A Load-Power Adaptive Dual Pulse Modulated Current Phasor-Controlled ZVS High-Frequency Resonant Inverter for Induction Heating Applications
28) Overview of Dual-Active-Bridge IsolatedBidirectional DC–DC Converter forHigh-Frequency-Link Power-Conversion System
29) Stability and Voltage Balance Control of aModular Converter With MultiwindingHigh-Frequency Transformer
30) Isolated ZVS High-Frequency-Link AC-ACConverter With a Reduced Switch Count
31) A LLC-Type Dual-Bridge Resonant Converter:Analysis, Design, Simulation,and Experimental Results
32) The High-Efficiency Isolated AC–DC ConverterUsing the Three-Phase Interleaved LLC ResonantConverter Employing the Y-Connected Rectifier
33) A Bidirectional High-Frequency-Link Single-phaseInverter: Modulation, Modeling, and Control
34) High-Frequency-Link Soft-Switching PWM DC–DCConverter for EV On-Board Battery Chargers
35) A Cascaded Multilevel Inverter Basedon Switched-Capacitor for High-FrequencyAC Power Distribution System
36) Optimal ZVS Modulation of Single-PhaseSingle-Stage Bidirectional DAB AC–DC Converters
37) A Soft-Switched Hybrid-Modulation Schemefor a Capacitor-Less Three-PhasePulsating-DC-Link Inverter
38) Hybrid Dual Full-Bridge DC–DC Converter With Reduced Circulating Current, Output Filter, and Conduction Loss of Rectifier Stage for RF Power Generator Application
39) A New ZCS-PWM Full-Bridge DC–DC Converter
With Simple Auxiliary Circuits
40) A Novel Three-Phase Buck–Boost AC–DC Converter
 41) A Novel Reduced Switching Loss Bidirectional AC/DC Converter PWM Strategy With Feedforward Control for Grid-Tied Microgrid Systems
42) Novel Zero-Voltage and Zero-Current Switching (ZVZCS) PWM Three-Level DC/DC Converter Using Output Coupled Inductor
43) Research on a Novel Modulation Strategy for
Auxiliary Resonant Commutated Pole Inverter With
the Smallest Loss in Auxiliary Commutation Circuits
44) H6 Transformerless Full-Bridge PV Grid-Tied Inverters
45) High Efficiency Photovoltaic Source Simulator withFast Response Time for Solar Power ConditioningSystems Evaluation
46) Novel Loss and Harmonic Minimized VectorModulation for a Current-Fed Quasi-Z-Source Inverter in HEV Motor Drive Application
47)  Switching Frequency Derivation for the Cascaded Multilevel Inverter Operating in Current Control Mode Using Multiband Hysteresis Modulation
 48) A Four-level Hybrid-Clamped Converter With Natural Capacitor Voltage Balancing Ability
49) A Novel Soft-Switching Multiport Bidirectional DC–DC Converter for Hybrid Energy Storage System
  50) Zero Voltage Switching Technique for Bidirectional DC/DC Converters

Monday, 26 May 2014

Distributed FACTS—A New Concept for Realizing Grid Power Flow Control

Flexible ac Transmission Systems (FACTS) devices are used to control power flow in the transmission grid to relieve congestion and limit loop flows. High cost and reliability concerns have limited the widespread deployment of FACTS solutions. This paper introduces the concept of Distributed FACTS (D-FACTS) as an alternative approach to realizing cost-effective power flow control. By way of example, a distributed series impedance (DSI) and a distributed static series compensator (DSSC) are shown that can be clipped on to an existing power line and can, dynamically and statically, change the impedance of the line so as to control power flow. Details of implementation and system impact are presented in the paper, along with experimental results.

Performances of Fuzzy-Logic-Based Indirect Vector Control for Induction Motor Drive


This paper presents a novel speed control scheme of an induction motor (IM) using fuzzy-logic control. The fuzzy-logic controller (FLC) is based on the indirect vector control. The fuzzy-logic speed controller is employed in the outer loop. The complete vector control scheme of the IM drive incorporating the FLC is experimentally implemented using a digital signal processor board DS-1102 for the laboratory 1-hp squirrel-cage IM. The performances of the proposed FLC-based IM drive are investigated and compared to those obtained from the conventional proportional-integral (PI) controller-based drive both theoretically and experimentally at different dynamic operating conditions such as sudden change in command speed, step change in load, etc. The comparative experimental results show that the FLC is more robust and, hence, found to be a suitable replacement of the conventional PI controller for the high-performance industrial drive applications.