This paper proposes an improved direct active and reactive power control (DPC) strategy for a grid-connected doubly fed induction generator (DFIG) based wind-turbine system under unbalanced grid voltage condition. The method produces required rotor voltage references based on the sliding mode control (SMC) approach in stationary reference frame, without the requirement of synchronous coordinate...

In Grid computing, the resources of many machines are used to execute jobs submitted by users. One of the research issues in Grid is the allocation process; the mapping of jobs to the various resources. This paper addresses the concept of applying strategies to the scheduling task. To this end a framework for economic scheduling in Grid computing using Tender/Contract-net model is presented. Th...

Workload and resource management are two essential functions provided at the service level of the Grid software. To improve the global throughput of these environments, effective and efficient load balancing algorithms are fundamentally important. Although load balancing problem in classical distributed systems has been intensively studied, new challenges in Grid computing still make it an inte...

Multisite task scheduling plays more and more important role in the grid computing as the WAN becomes faster and faster. Through the development of a three-level architecture of the distributed computing grid model and a grid schedule model, a scalable environment for multisite task scheduling is put forward. Then, a multisite Distributed Scheduling Server is designed and its prototype is imple...

Computational grid nowadays has become a hotspot in high performance computing environments because it can solve larger scale computing problems. The present load balance strategy in computing grid such as the Globus tools is static. This paper mainly focuses on dynamic load balance in the computational grid. We put forward a new model that solves the dynamic load balance problems on computatio...

This paper gives an overview of the main current control strategy for single-phase grid-connected inverters. The model of the power circuit is first discussed. Then, a classification of current control strategy in stationary reference frame follows. This is continued by a discussion of current control structures for single phase grid-connected inverters and the possibilities of implementation i...

Grid-connected solar micro-inverter is a highly nonlinear and time-varying system, so it is difficult to achieve good control effect using traditional PI controller. In this paper, small signal analysis model of micro-inverter is established, grid-connected current control strategy composed of fuzzy PI controller and grid voltage feed-forward is put forward, and the initial parameters of PI con...

In the provision of a Grid service, a provider may have heterogeneous clusters of resources offering a variety of services to widely distributed user communities. Within such a provision of services, it will be desirable that the clusters will be hosted in a cost effective manner. Hence, an efficient structure of the available resources should be decided upon these clusters. A static structure,...