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The utility interface (UI) converter is a three-phase power conversion unit equipped with energy storage which governs the interaction between the utility grid and the microgrid. The non-interruptive operation of UI is desired due to its several functions: 1) in grid-connected operation it performs as a voltage-supporting unit regulating the power flow through the microgrid point of common coupling,...
Network reconfiguration is the process of alteringthe topological structure of distribution feeders to achievemore reliable and economic operation of distribution network. Distribution Network Reconfiguration (DNR) is a multiobjective, combinatorial, non-differentiable constrainedoptimization problem. This strategy nowadays is veryfrequently used by distribution engineers to meet variousobjectives...
In this paper a new topology for boost converter as well as an efficient control system based on state space modeling is presented in order to improve the power factor of the network. The main objective of this study is to adjust the real power of DG resources connected to network. The proposed power factor correction (PFC) boost converter includes two loops for current and voltage control and on...
This paper describes the structure, control and performance analysis of an alternative configuration of a low cost three-phase transformerless online UPS. The proposed UPS avoids the use of galvanic isolation and consists of a half-bridge rectifier, a battery bank, a half-bridge inverter, a split DC bus and an auxiliary circuit. The auxiliary circuit is composed of an inductor and a small rating switching...
Given the emphasis on reliability of life-safety equipment in facilities, this paper will report the findings of an extended (Part 2) NEMA 5VS Section sponsored survey on electrical surge damage to such equipment and the financial impact for electrical systems and life-safety equipment. Further, the paper will outline the expected transient voltage surge environment in an electrical system with a...
In some states, regulated utilities are required to interconnect a generating renewable energy customer, and the customer is required to pay for infrastructure required to support the connectivity while preserving the power quality and reliability of the distribution system it is being connecting to. The host utility is responsible for performing studies to make the lowest cost improvements that accommodate...
The availability of different energy sources, both the conventional and renewable energy sources, urge towards a solution of their application and their accessibility to the consumer. This requires their integration in smart grids on a common platform to deliver clean and uninterrupted power at low cost. The paper proposes to augment these sources on a common DC bus platform with control scheme of...
Future electricity demand will significantly increase, while flexibility in supply will decrease, due to an increase in the use of renewable energy sources. The most effective way to prepare distribution grids for this increase in loading and decrease in supply-flexibility is to apply balancing, load-shifting, peak-shaving and other smart-grid related technologies. Without the implementation of smart...
This paper discusses the need for power quality microgrids to provide 1/4 cycle response to compete with existing power quality products by offering similar performance. However, providing 1/4 cycle response in distributed line-interactive microgrids is difficult due to the challenge of force commutating the static switch. Seamless islanding adds significant cost to microgrids, and to avoid adding...
In this paper, the performance of power electronic interfaced distributed energy resources (DERs) operating with communication network is investigated. The application of power electronic interface is required, for system operation and control while achieving a stable system with high power quality. In a smart grid scenario, due to the dependency of data acquisition, protection and control, an integrated...
DC-DC converters are the heart of any switched mode power supply (SMPS) system. Rather than using multiple number of DC-DC converters for regulating voltage of each of the outputs in a multi-output SMPS, the reliability and cost-effectiveness can be improved if a single DC-DC converter is used and viable control technique is employed to regulate the voltages effectively. This paper deals with such...
The paper presents a family of novel switched smart filter compensated devices using Green Plug Smart Filter Soft Starter GP-SF-SS devices for small single phase induction motors. GP-SF-SS devices are equipped with a dynamic online error driven optimally tuned controller that ensures improved power factor, reduced feeder losses, stabilized voltage, minimal current ripples and efficient energy utilization/conservation...
Reliability comparison and the concept of quality service are becoming a standard part of marketing utility. Power quality and reliability is the key to successful delivery of quality product and operation of an industry. The reliability of an electrical power distribution system can be increased by automation of its feeder and associated parts. Automated and remotely controlled service restoration...
As technology and economic development, the requirements of community power quality, continuity and reliability are increasing. Contradiction between supply and demand will become more and more prominent. Power distribution system is an important part of the user connection. It is directly related electrical safety and reliability to the user. At present 10 kV Substation is and implementation of power...
Many utilities have experienced blown fuses on three phase distribution capacitor banks caused by failed capacitor cells, lightning, back-to-back capacitor switching transients, etc. Traditional capacitor protection on distribution circuits includes lightning arrestors, expulsion fuse current limiting fuse links, and pre-insertion inductors. This paper will summarize the experiences of utilizing air...
Voltage sags and extended under voltages have the largest negative impact on industrial productivity and could be the most important type of power quality variation for many industrial and commercial customers. This paper proposes a 3-phase PWM ac-ac Cuk converter with minimum switches to maintain constant output voltage irrespective of the variation of input voltage and load. By PWM duty ratio control...
Distribution system has witnessed numerous problems due to concentrated power loading in cities. Stability, reliability, peak demand, poor power quality, unbalanced loading are some of the major issues besides handling of large AC networks. This paper proposes an insertion of DC power dam connected between transmission and distribution system, through bidirectional voltage source converter (VSC) both...
Overcurrents on distribution systems include permanent faults, temporary faults and other lower magnitude surges, typically from switching events. The overcurrent environment of the distribution system requires quantification if improvements are to be made in power quality, protection and reliability. New and more complex overcurrent protection products require more exact knowledge of feeder conditions...
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