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In this paper a laboratory power inverter platform is proposed. The platform can operates autonomously by choosing an adequate signal processor or controlled by the powerful dSpace 1104 board, facilitating the rapid implementation of the design algorithms. At the same time, scalar and field oriented control of the three-phase asynchronous machine through the ControlDesk tool have been developed. Functional...
This paper aims to presents the results obtained in PV emulating with a 1,5 kW Magna-Power programmable DC voltage source, boost converter, battery bank and resistive load. For MPPT (maximum power point tracking) an improved P&O algorithm is used. Hardware implementation is done under DS 1103 controller board running Matlab and ControlDesk® software with PX4 expansion box. This paper presents...
A DC/DC converter that can be used to charge a lead-acid battery bank from a wide variety of input renewable sources is presented. The motherboard of the converter can be populated in such way that a boost or a SEPIC (Single-Ended Primary-Inductor Converter) structure is obtained. In order to lower the stress on the electronic components, the converter uses four DC/DC stages connected in parallel...
In almost all linear applications the internally compensated operational amplifiers have no stability problems. But, some particular circuits as “the capacitive load amplifier” or “the composite amplifier” may have ringing step response. The paper proposes a new technique by which the integrated circuit user can estimate the open-loop Bode diagrams of the amplifier configured with a negative feedback...
The distributed regenerative drive system (DRDS) proposed in this paper is based on the three-phase grid quasi sinusoidal power converter and a common distributed dc-link as a power supply for the vector controlled three-phase power inverter and for the bidirectional dc-dc power converter. The braking energy of both three phase induction motor and dc motor are regenerated in the grid at unity power...
Given the increasing interest in small wind systems, the authors propose three applicable control strategies, confirmed by Matlab/ SimPowerSystem simulation software in terms of energy conversion optimization and stable operation. The analyzed small power wind energy conversion system has a Permanent Magnet Synchronous Generator — PMSG, a diode rectifier, a DC-DC converter, a battery and DC consumers...
This paper deals with automatic control of a low power wind system based Permanent Magnet Synchronous Generator — PMSG, as a first step from designing and analyzing of a distributed systems (up to 5 kW) for generating and using electrical energy from renewable sources (wind and photovoltaic). The general system is designed to supply electrical power to consumers, when an electrochemical power storage...
The paper presents a new version of the ROVIBAT (ROmanian VIrtual BAT) sonar head, based on airborne transducer module (ATM) with five discrete frequencies (40, 125, 200, 228 and 300 kHz). The sonar head is used for navigation of the robots and for ultrasonic image generation of the explored environment. The previous versions of the ROVIBAT heads, i.e. 00 to 04, have used a single working frequency...
This paper provides adequate information about the problem of real-time replicating in laboratory conditions. The dynamic behavior of stand-alone low-power wind energy conversion systems (WECS) in response to the wind speed variations and also to the electrical load variations is replicated. The investigated system consists of a variable-speed wind turbine based on a permanent-magnet synchronous generator...
Airborne ultrasonic transducers with wide range of working frequency (50–200 kHz) are considered in this paper. The transducers are made from a special electromechanical film (EMFIT). Previous works based on EMFIT have considered aluminum active surfaces, on one or both sides of the transducer. The present work considers active surfaces made from gold. The obtained ultrasonic transducers are measured...
This paper presents a comparative study of three maximum power point tracking (MPPT) algorithms to be used with solar panel input, both from theoretical and practical points of view. An improved perturb & observe (P&O), a sliding mode technique and a method based on power versus voltage variations (dP / dV) are presented. Optimization of the tracking algorithms targets both the tracking of...
The paper presents a design and fabrication technology of the pinnae, i.e. external ear in the context of biomimetic sonar heads building for in air sonar applications. The basic steps and formula of the design process are described followed by a description of the fabrication technology for various sizes and shapes of pinnae. The experimental measurements are focused on voltage sensibility and pattern...
The paper describes a fully automated system for measurement of the ultrasonic signals generated by ultrasonic transducers, designed for operating in air for a frequency range from 40 to 300 kHz. Study of new material's properties and sensitivity patterns for bio-mimetic ultrasonic transducers will be made. Measurements to estimate other important parameters of transducers will be possible as well...
The developments in the area of Evolvable Quantum Hardware (QEHW) are based on successful quantum genetic algorithms (QGAs) that take advantage of both the Genetic Algorithms (GAs) and Quantum Computation (QC) parallelism. This paper presents a new Quantum Inspired Genetic Algorithm (QIGA) based on the evolution of a single chromosome. A simple combinational circuit has been implemented using a conventional...
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