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This work presents an experimental control strategy of stand-alone photovoltaic (PV) system composed of: PV array, DC-DC converters, electrolytic storage and programmable DC electronic load. This control aims to extract maximum power from PV array and manages the power transfer through the DC load, with respect to available storage level. The designed system can supply a DC load at the same time as...
The paper presents investigation, digital control realization and efficiency evaluations of a single-phase grid connected photovoltaic system, composed of DC-DC boost converter and full-bridge inverter with timesharing modulation. The system is analyzed with the use of Matlab-Simulink and FPGA-based real-time models.
This paper introduces a new designed diesel-electric power-supply unit developed for military purposes. The power-supply unit is divided to two main electric parts, (i) input part which is composed of a sensorless controlled active voltage source rectifier supplied by a permanent magnet synchronous generator, and (ii) output part which is composed of a four-leg three-phase voltage source inverter...
This paper presents the using of the converter with SMES to ensure the dynamic (transient) stability of power system. The force commutated converter ensures the power transfer between SMES and power system by the use of microprocessor based control system that realizes spacevector PWM algorithm. It is given the approximate calculation of the required SMES power. Also the results of computer simulation...
This paper presents an innovative control law for a distributed dc generation supplied by fuel cell (FC) generator. Basically, an FC is always connected with a power electronic converter. This kind of system is non-linear behavior. Classically, to control the voltage, the current or the power in the converter, linearized technique is often used to study the stability and to select the controller parameters...
This paper introduces a digitally performed voltage and current control mode for dc-dc step up converter based on FPGA technology. The voltage and current measurement was realized by using A/D converters as peripheral units of the FPGA system. Special attention was performed with current measurement and its A/D conversion due to the used predictive current mode algorithm which enables the fully digitalization...
In the paper an on-line secondary path model identification problem for feedforward as well as feedback adaptive active noise control systems working with a deterministic constant or random sampling interval is discussed. A focus on almost sure convergence of identified model to true plant in the case of information about secondary path hidden in between single multiplicities of the quant of A/D converter...
DC-DC boost converter in PWM switch mode is attractive for high power white LED constant current driver. The occurrence of uncertainty and coil magnetic saturation in DC-DC power converters makes their analysis and control difficult. A fuzzy logic controller (FLC) is then utilized to ensure current regulation over a wide range of parameters, which is perceived as an optimization problem. A robust...
A wind speed sensorless neural network (NN) based maximum power point tracking (MPPT) control algorithm for variable speed wind energy conversion system (WECS) is proposed. The proposed method is developed using Jordan type recurrent NN which is trained online using back-propagation. The algorithm, without requiring the knowledge of wind speed, air density or turbine parameters, generates at its output...
Great part of the energy generated in the industrialized world is consumed by lighting, and to reduce the energy consumption fluorescent lamp are used; to operate a fluorescent lamp properly an electronic ballast is required. Different techniques to improve the characteristics of the topologies of electronic ballast are reported in literature; to fill the standard specifications at low cost, one option...
This paper presents the design considerations and the implementation of a cd-cd buck-boost converte, which can process the energy transferred from the ultra capacitors (UC) bank and batteries to the load (motor drive system of an Electric Vehicle EV). The UC bank is used as auxiliary source to supply the motor drive system which allows recovering the energy generated during the regenerative breaking;...
In several applications DC/AC converters are widely used; traditionally they can be classified in voltage source inverters (VSI) and current source inverters (CSI). Their use depends on the application. Other possibility for the DC/AC conversion is the multilevel configuration, and the most analyzed is the VSI. In this paper a multilevel current source inverter (MCSI) is proposed. The operation, analysis...
The paper proposes a Fuzzy logic approach for controlling three-level NPC converters in stand alone wind energy systems. A key function of this controller is to maintain constant voltage and frequency for customers while maintaining smooth voltage waveform with less filtering requirements. The principle of the proposed Fuzzy controller is based on a modified PI approach in which the error and its...
With the application of renewable energy, the distributed energy network is researched and developed widely. This paper designed the distributed stand-alone PV generating system with battery backup. The coordinated MPPT control of several parallel modules is designed to increase PV utilizing efficiency. The multi-variable multi-loop controller is designed to control the currents of each module, the...
In this paper is described the different items of a subsea observatory. The control system is constantly monitoring the internal and external components of the observatory detecting operating faults and acting automatically in consequence.. It will be presented an overview of the information treatment servers structure used in the OBSEA project explaining the chosen topology.
Photo Voltaic (PV) generators today find application in the domestic field, where the decentralized power conversion concept has proven to be more advantageous than the conventional string architecture. According to the decentralized power conversion concept, PV modules are connected to a single phase AC grid through a two stage converter composed of a DC/DC converter and an inverter. The DC/DC converter...
Among Renewable Energy Sources (RES), Photovoltaic (PV) sources represent an attractive solution because the solar energy is accessible everywhere; moreover, the price per watt of PV modules is going on decreasing. The output voltage furnished by a PV module is quite low; therefore, a series connection of different modules have to be employed in order to obtain a sufficient output dc voltage. In non-uniform...
This paper deals with the holistic modeling approach of a combined Photovoltaic, Wind and Fuel Cell power system. The method is using the DK5 modeling/design environment from Mentor Graphics and is based on the new Handel-C programming language. The goal of the work carried out was to achieve an optimized holistic digital control system design, followed by its rapid prototyping into a single Field...
PEBB based power converters are the ideal solution for interfacing different portions of the network in power distribution systems. Flexibility is the feature that makes them suitable as power routing devices, load drives, active filters, and interfaces for energy storage devices. Standardization is the key to actual realization. The flexibility and the standardization of the hardware components must...
A new non-isolated boost converter with high voltage gain is proposed in this work. This converter is suitable for nonisolated on-line UPS systems, with common neutral connection, that improves bypass circuit installation. The adopted control strategy uses a hybrid control that implements both analog and digital controllers, that implements the average current mode control. It presents characteristics...
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