Reconfiguration Of Distributed Systems Research Articles

Optimal placement of switching equipment in reconfigurable distribution systems

This paper presents a comparative analysis of some measures that can improve the reliability of medium-voltage (MV) distribution feeder. Strictly speaking, the impact of certain types of switching equipment installed on the feeder and possibilities of backup supply from the adjacent feeders were analyzed. For each analyzed case, equations for the calculation of System Average Interruption Duration Index and energy not delivered to the customers are given. The effects of certain measures are calculated for one real MV-feeder for radial supply to customers and in cases of possible backup supply to the customers. Installation locations of certain types of switching equipment for the given concept of energy supply are determined according to the criterion of minimum value of System Average Interruption Duration Index and according to the criterion of minimum value of energy not delivered to the customers.

Distribution system reconfiguration using a modified Tabu Search algorithm

This article presents an efficient meta-heuristic method for reconfiguration of distribution systems. A modified Tabu Search (MTS) algorithm is used to reconfigure distribution systems so that active power losses are globally minimized with turning on/off sectionalizing switches. TS algorithm is introduced with some modifications such as using a tabu list with variable size according to the system size. Also, a random multiplicative move is used in the search process to diversify the search toward unexplored regions. The Kirchhoff algebraic method is adopted to check the radial topology of the system. A salient feature of the MTS method is that it can quickly provide a global optimal or near-optimal solution to the network reconfiguration problem. To verify the effectiveness of the proposed approach, the effect of load variation is taken into consideration and comparative studies are conducted on three test systems with rather encouraging results. The obtained results, using the proposed MTS approach, are compared with that obtained using other approaches in the previous work.

Distribution Network Reconfiguration Considering Protection Coordination Constraints

The issue of protection system coordination in reconfigurable distribution systems is dealt with in this article. The protection coordination requirement restricts the changes in the power-flow direction through the distribution lines and drastically reduces the search space to be explored by the network reconfiguration algorithms. Moreover, the protection system for the reconfigurable distribution network has to be designed considering all permissible configurations of the network. This article illustrates the protection design procedure through a test network and presents a network reconfiguration algorithm incorporating the protection coordination constraints.

CONTROL SYNTHESIS FOR RECONFIGURABLE DISTRIBUTED SYSTEMS WITH APPLICATIONS IN MANUFACTURING

We present a framework for control synthesis of reconfigurable distributed agent systems, where each agent includes its own set of basic functions and local rules. There are also global rules, which govern the interaction and communication between these agents. Agents are logically defined by a control synthesizer, communicator, and executer. The control synthesis is capable of detecting and avoiding single level deadlocks at execution level. We illustrate the concept through an example.

An agent-based approach to reconfiguration of real-time distributed control systems

We describe a general approach for dynamic and intelligent reconfiguration of real-time distributed control systems that utilizes the IEC 61499 function block model. This work is central to the development of distributed intelligent control systems that are inherently adaptable and dynamically reconfigurable. The approach that is used takes advantage of distributed artificial intelligence at the planning and control levels to achieve significantly shorter up-front commissioning times as well as significantly more responsiveness to change. This approach is based on object-oriented and agent-based methods, and aims at overcoming the difficulties associated with managing real-time reconfiguration of an intelligent manufacturing system.

A reconfigurable concurrent function block model and its implementation in real-time Java

This paper focuses on the important holonic manufacturing systems issue of automatic and dynamic adaptability to change at the physical machine level of control. We propose a model to support configuration and reconfiguration of real-time distributed

A two-phased approach to the supply network reconfiguration problem

This study focuses on a supply network problem where resource inputs are constrained to achieve performance goals for the reconfigured distribution system. Simulated annealing is applied for solving this reconfiguration problem. The supply network is comprised of distribution centers that are geographically distributed and have differing operating and maintenance cost structures on distribution-related resources. The distribution planning methodology employed in the heuristics has two phases: Phase one incorporates a strategic-based decision making step in which the `best' set of distribution centers are selected open; Phase two incorporates an operationally-based decision making step in which the heuristics perturb the customer assignments and resource assignments. The heuristics are tested on a set of 450 problems of various sizes and structures. Computational results suggest that the simulated annealing heuristics generate near optimal solutions quickly and are well suited for evaluating supply network reconfiguration. Computational results also suggest that enhanced annealing heuristics proposed in this paper are better than the standard annealing approach. The supply network problem structure was exploited to achieve very good solution results.