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To implement efficient control solutions for energy micro-systems a key issue is to predict the difference between the power generated by renewable resources and the load determined by local consumers. This paper explores linear, based on AR and ARMA models, and nonlinear solutions, based on neural networks, for predicting the power balance in a micro-grid. The predictions can be used at the top level...
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...
The control of low power systems, which include renewable energy sources, a local network, an electrochemical storage subsystem and a grid connection, is inherently hierarchical. The lower level consists on the control systems of wind sources (power limitation at rated value in full load regime and energy optimization in partial load regime) and photovoltaic (energy conversion optimization). The control...
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...
In this paper a new AC/DC unidirectional switching cell with five voltage levels is proposed. It is called 5L-Stacked-Coupled-Inductors (5L-SCI) cell and can be connected between an AC current source and a DC voltage source. The novelty of 5L-SCI topology is based on two cascaded stages that work at different currents and different switching-frequency. The first stage contains two diodes that operate...
This paper presents several possibilities for electric power supply from renewable sources of electric vehicle charging stations. The supply system sizing and the economic analysis were performed using the specialized computing facility Homer energy and the local resources data needed to optimize the system were taken from the RETScreen databases. In this way we could choose the photovoltaic panels...
Based on a wind system equipped with a permanent magnet synchronous generator (PMSG), a rectifier, a chopper and a continuous load, three power optimization methods are investigated. The main objective of this paper aims a control solution for wind energy conversion optimization by using estimated wind speed in relation with optimal electromagnetic torque, when the power coefficient and the optimal...
The paper deals with the robust control of the dissolved oxygen concentration in the case of wastewater treatment processes. The Gain Scheduling control method has been chosen for the dissolved oxygen concentration control. Firstly the dissolved oxygen control loop was experimental identified in various operating points. The Gain Scheduling strategy was designed so that the behaviour of the closed...
This paper analyzes the variability of the linearized model of a Horizontal Axis Wind Turbine (HAWT) system that operates around the optimal regimes characteristic (ORC). Based on the obtained results, a gain scheduling control structure is proposed for rotational speed tracking in order to ensure maximum power conversion. The proposed control law performances are illustrated by numerical simulation...
In recent years, Modular Multilevel Converters (MMCs) have received an increasing attention, because they are seen as a viable solution for high power applications. An MMC is characterized by a modular arm structure, composed of a cascade connection of a large number of simple dc/dc cells with floating capacitors. These cells can be easily assembled into a converter for high- or medium-voltage power...
In this paper a hierarchical control structure appropriated to recirculating aquaculture processes is proposed. The control software consists in two levels. The first level is the low level and deals with the basic control functions of the process such as: the control of the dissolved oxygen concentration and the temperature monitoring in the aquaculture tanks, the pH control after the mechanical...
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