Separated magnet yoke for permanent magnet linear generator for marine wave energy converters

In this paper the performance of a longitudinal flux permanent magnet linear generator (PMLG) for wave energy converters (WEC) is investigated. The influence of the number of slots per pole, phase q and the number of stator's winding sections are analysed. The power output and the cogging forces in the PMLG are calculated and reviewed with respect to the above design parameters. In addition, an optimised PMLG model is designed and simulated. Three-dimensional Finite Element Method (FEM) is used for solving the combined field and circuit equations of the generator.The PRIMaRE project

Multiobjective automated and autonomous intelligent load control for smart buildings

This paper deals with design of a real-time and versatile yet simple control and management strategy for provision of adaptive and intelligent demand response for buildings. The proposed three-phase multiobjective autonomous/automated intelligent load (MAIL3) control strategy offers the following superiorities in a computationally-efficient approach: 1) by introducing voltage hopper technology, it can provide autonomous and automated grid ancillary service and load control without the need for a supervisory/centralized controller; 2) it can also track and realize regulation commands from an independent system operator; 3) it is applicable to buildings with hybrid AC/DC grids including AC and DC impedance loads, battery energy storage systems (BESSs), and variable frequency drives (VFDs); 4) it is a unified load control strategy for both grid-connected and islanded buildings with seamless transition between them; 5) as opposed to common on/off demand control techniques in the literature, the proposed method provides a continuous and adaptive demand control; and 6) the MAIL3 is based on a new control technique for voltage source converters using synchronous current converters technology. Extensive results are presented to demonstrate effectiveness of the method

Designing high-order power-source synchronous current converters for islanded and grid-connected microgrids

This paper deals with development of a versatile and compact control strategy for voltage source converters in grid-connected and islanded microgrids using synchronous current converters technology. The key feature is its new integrated high-order controller/synchronizer with applicability to both operational modes without strategy rearrangement. Using high-order controllers, on the other hand, results in rather complex analysis and design process, therefore this paper aims at providing a general and simple theme for the design and parameter selection. The controller also provides adaptive and automated current-based grid synchronization. Moreover, the controller realizes a power-source current-controlled microgrid with minimum control loops, as compared to widely adopted voltage controlled microgrids in the literature, with advantages such as fault-ride-through and inherent droop-less power sharing capabilities. Adaptive current-based synchronization and smooth switching to islanding mode provides high flexibility, reliability and only-plug operation capability. Extensive simulation and experimental results are presented to demonstrate performance of the proposed control and management strategy

Coeliac disease. The use of serological markers in Libyan children for screening and diagnostic purposes.

Coeliac disease is a chronic inflammatory disorder of the small bowel that results in malabsorption of nutrients. The disease, also called non-tropical sprue, coeliac sprue or gluten-sensitive enteropathy, is induced by components in the prolamin fraction of wheat (gliadin), barley (hordein), rye (secalin) and possibly oats (avenin). In addition to nutrient deficiencies, prolonged coeliac disease is associated with an increased risk of malignancy, especially intestinal T-cell lymphoma. The characteristic histological appearance is that of villous atrophy, crypt hyperplasia and lymphocytic infiltration of the epithelium and lamina propria. The disease has a number of autoimmune-like features which include a strong association with HLA, the occurrence of autoantibodies in patient's sera, association with other autoimmune diseases (IDDM, SLE, RA), responsiveness to corticosteroids and a dense lymphocytic infiltrate in the affected bowel.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Multiobjective autonomous intelligent load control for hybrid single-/three-phase AC/DC smart buildings

Modern distribution grids and smart buildings comprise unbalanced single-phase, three-phase, DC, and constant power loads and battery energy storage systems (BESSs). This paper presents a hybrid single/three-phase multiobjective automated/autonomous intelligent load (MAIL1) control for smart buildings. The main focus is to autonomously and automatically respond to grid disturbances and power imbalances and unbalances by adaptive demand adjustment of various loads. Also, it can realize regulation objectives of a supervisory operator to enable fast building demand control to participate in performance-based frequency regulation markets. Moreover, it is a unified load control strategy for both grid-connected and islanded hybrid single/three-phase AC/DC grids with smooth transition between them without a need for the strategy reconfiguration. The MAIL1 renders an adaptive and continuous demand for single-phase AC and DC loads. The MAIL1 is based on a fundamentally new controller for single-phase voltage source converters (VSCs) by introducing single-phase DC-source synchronous current converter technology, with extra functionalities such as auto-synchronization with single-phase grids and virtual inertia. Extensive real-time hardware-in-loop results are presented to demonstrate the MAIL1 performance