http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

This book, written by two major figures in adaptive control, provides a wealth of material for researchers, practitioners, and students. While some researchers in adaptive control may note the absence of a particular topic, the book‘s scope represents a high-gain instrument. It can be used by designers of control systems to enhance their work through the information on many new theoretical developments, and can be used by mathematical control theory specialists to adapt their research to practical needs. The book is strongly recommended to anyone interested in adaptive control.

Adaptive Control

Multiphase variable-speed drives and generation systems (systems with more than three phases) have become one of the mainstream research areas during the last decade. The main driving forces are the specific applications, predominantly related to the green agenda, such as electric and hybrid electric vehicles (EVs), locomotive traction, ship propulsion, “more-electric” aircraft, remote offshore wind farms for electric energy generation, and general high-power industrial applications. As a result, produced body of significant work is substantial, making it impossible to review all the major developments in a single paper. This paper therefore surveys the recent progress in two specific areas associated with multiphase systems, namely power electronic supply control and innovative ways of using the additional degrees of freedom in multiphase machines for various nontraditional purposes.

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Advances in Converter Control and Innovative Exploitation of Additional Degrees of Freedom for Multiphase Machines

Multilevel inverter supplied multiphase variable-speed drive systems have in recent times started attracting more attention, due to various advantages that they offer when compared to the standard three-phase two-level drives. For proper functioning of such systems good pulsewidth modulation (PWM) strategy is of crucial importance. Control complexity of multiphase multilevel inverters increases rapidly with an increase in the number of phases and the number of levels. This paper deals with a three-level neutral point clamped (NPC) inverter supplied five-phase induction motor drive and analyses five PWM strategies: three are carrier-based (CBPWM) and two are space vector based (SVPWM). The aim is to provide a detailed comparison and thus conclude on pros and cons of each solution, providing a guideline for the selection of the most appropriate PWM technique. Experimental results are provided for all analysed PWM methods. The comparison of the PWM techniques is given in terms of the voltage and current waveforms and spectra, as well as the total harmonic distortion (THD) in a whole linear modulation index range, which is used as the global figure of merit. Properties of the common mode voltage (CMV) are also investigated. Complexity of the algorithms, in terms of the computational time requirements and memory consumption, is addressed as well. It is shown that the performance of the PWM techniques is very similar and that one CBPWM and one SVPWM technique are characterised with identical performance. However, using the algorithm complexity as the main criterion, space vector techniques are more involved.

A Comparison of Carrier-Based and Space Vector PWM Techniques for Three-Level Five-Phase Voltage Source Inverters

This paper describes a combination of direct torque control (DTC) and space vector modulation (SVM) for an adjustable speed sensorless induction motor (IM) drive. The motor drive is supplied by a two-level SVPWM inverter. The inverter reference voltage is obtained based on input-output feedback linearization control, using the IM model in the stator D-Q axes reference frame with stator current and flux vectors components as state variables. Moreover, a robust full-order adaptive stator flux observer is designed for a speed sensorless DTC-SVM system and a new speed-adaptive law is given. By designing the observer gain matrix based on state feedback H∞ control theory, the stability and robustness of the observer systems is ensured. Finally, the effectiveness and validity of the proposed control approach is verified by simulation results.

Novel Direct Torque Control Based on Space Vector Modulation With Adaptive Stator Flux Observer for Induction Motors

This paper presents a simple accurate model for photovoltaic (PV) modules
 suitable for implementation by digital signal processors (DSPs). A buck
 DC-DC converter is employed to realize the PV characteristic appropriately.
 Three controllers set forth for current control according to PV voltage to
 achieve fast and accurate convergence. Computer simulation results are
 presented to investigate the effectiveness of the proposed PV system.
 Moreover, a practical setup is made and the proposed method using the
 obtained model for different temperatures and solar irradiations is tested
 in MATLAB/Simulink environment.

/pdf/modeling-and-realization-of-photovoltaic-simulator-based-on-3590j9io.pdf

Modeling and realization of photovoltaic simulator based on a buck DC-DC converter

—To supply power demands reliably, power system should cope with various disturbances and faults and its stability should be retained A power system may be failed due insufficient damping of synchronizing torque In this paper, to improve the dynamic stability of a power system a feedback control based on H2 method is designed To formulate the problem appropriately, linear matrix inequality (LMI) theory is employed To optimize the overall closed-loop system response, the parameters of controller is optimized using particle swarm optimization (PSO) algorithm Simulation results represent the effectiveness and validity of the proposed controller and its superiority over conventional power system stabilizer (PSS)

/pdf/dynamic-stability-improvement-of-a-power-system-based-on-a-1aytnrfbwj.pdf

Dynamic Stability Improvement of a Power System Based on a PSO-Tuned H2 Controller

In this paper, an improved reduced-order sliding mode controller with PI controller is discussed for positive output elementary super-lift Luo (POESLL) converter operated in continuous conduction mode. Because of successive switching operation, the dynamic of this converter is nonlinear severely. The proposed controller improves the dynamic and static performance of the converter. The main advantage of the proposed controller compared with other controllers is the direct control and regulation of the output voltage. The performance of this controller is verified for various operating points in MATLAB software. In addition, a laboratory setup is made. Experimental results show the controller has an excellent performance against variations of the operating point.

Navid Reza Abjadi

Papers

Modeling and realization of photovoltaic simulator based on a buck DC-DC converter

Dynamic Stability Improvement of a Power System Based on a PSO-Tuned H2 Controller

Design and implementation of an improved reduced-order sliding mode controller with pi control for poesll converter