We are pleased to present a special issue of best papers presented at the 4th International Workshop on Middleware for Grid Computing (MGC 2006), which was held in conjunction with the ACM/IFIP/USENIX 7th International Middleware Conference during November 2006 in Melbourne, Australia. The goal of the fourth edition of the MGC workshop was to bring together researches in the field of middleware...

This paper proposes a Flexible Power Electronic Transformer (FPET) for the application in the micro-grids. The low frequency transformer is usually used at the Point of Common Coupling (PCC) to connect the low voltage grid and utility network to each other. The conventional 50Hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. In this pap...

Nowadays, the doubly-fed induction generators (DFIGs) based wind turbines (WTs) are the dominant type of WTs connected to grid. Traditionally the back-to-back converters are used to control the DFIGs. In this paper, an Indirect Matrix Converter (IMC) is proposed to control the generator. Compared with back-to-back converters, IMCs have numerous advantages such as: higher level of robustness, re...

The challenge of electricity distribution’s upgrade to incorporate new technologies is big, and electric utilities are mandated to work diligently on this agenda, thus making investments to ensure that current networks maintain their electricity supply commitments secure and reliable in face of disruptions and adverse environmental conditions from a variety of sources. The paper presents a new ...

Grid computing has emerged as a technology to solve the problem of sharing and cooperating of computational resources in wide area. In this paper, we propose a Grid architecture called Vega Personal Grid (the Vega PG). The key feature of the Vega PG is that it is a usercentered lightweight Grid architecture. We make a mapping between traditional computer systems and the Vega PG, which comprises...

A Grid service is an extended Web service that conforms to the Open Grid Service Infrastructure (OGSI) specification. The capability that existing Web service technology express is relatively weak. The publishing and discovery of Grid resource are crucial steps in Grid computing. In this paper, we propose a novel semantics based Grid Service framework which support publishing and discovery of G...

Smart Grid (SG) is a smart concept based on cerebral advanced technologies; SG also becomes a subject matter for research. It unified inventive machine and technologies starts from generation, transmission and distribution to the consumer usage. With the advancement in the technology, various steps are taking place to convert power grid to smart grid. At current stage various models of SG are c...

Micro-grid control is the key technology in the process of accessing micro-grid into regular grid. This paper summarizes several ways on coordination control in micro-grid and introduces some domestic researches on micro-grid control strategies. It is written on the basis of the achievements on micro-grid control in some developed countries and current situations on domestic micro-grid control....