A general formulation of the feeder reconfiguration problem for loss reduction and load balancing is given, a novel solution method presented. The uses search over different radial configurations created by considering switchings branch exchange type. To guide search, two power flow approximation methods with varying degrees accuracy have been developed tested. are used to calculate new in system after they make use equations distribution systems. Both analysis test results show that...

A general formulation of the feeder reconfiguration problem for loss reduction and load balancing is given, a novel solution method presented. The uses search over different radial configurations created by considering switchings branch exchange type. To guide search, two power flow approximation methods with varying degrees accuracy have been developed tested. are used to calculate new in system after they make use equations distribution systems. Both analysis test results show that...

The problem of capacitor placement on a radial distribution system is formulated and solution algorithm proposed. location, type, size capacitors, voltage constraints, load variations are considered. objective peak power energy loss reduction, taking into account the cost capacitors. as mixed integer programming problem. flows in explicitly represented, constraints incorporated. A method has been implemented that decomposes master slave used to determine location by type capacitors placed...

A capacitor sizing problem for capacitors placed on a radial distribution system is formulated as nonlinear programming problem, and solution algorithm developed. The object to find the optimal size of so that power losses will be minimized given load profile while considering cost capacitors. formulation also incorporates AC flow model voltage constraints. developed based Phase I-Phase II feasible directions approach. Novel equations method, called DistFlow, systems are introduced. method...

This paper investigates the opportunities and challenges associated with adopting a DC distribution scheme for industrial power systems. A prototype system has been simulated to investigate issues. One of issues focused is interaction between converters that are used convert AC AC. Another challenging issue investigated grounding. These become mainly due neutral voltage shift converters. The shows converter interactions can be minimized proper filtering control on also proposes grounding...

Integrating a battery energy storage system (BESS) with solar photovoltaic (PV) or wind farm can make these intermittent renewable sources more dispatchable. This paper focuses on the development of control strategy for optimal use BESS this purpose. The considers rule-based scheme, which is solution problem defined, to incorporate operating constraints BESS, such as state charge limits, charge/discharge current and lifetime. goal have provide much smoothing possible so that resource be...

Integrating a battery energy storage system (BESS) with large wind farm can smooth out the intermittent power from farm. This paper focuses on development of control strategy for optimal use BESS this purpose. The considers conventional feedback-based scheme revisions to incorporate operating constraints BESS, such as state charge limits, charge/discharge rate, and lifetime. goal is have provide much smoothing possible so that be dispatched an hourly basis based forecasted conditions....

Utilities currently use historical customer load data to forecast the loads in their distribution feeders for real-time feeder analysis and control. In this paper a three-phase state estimation method is developed increase accuracy of data. The based on weighted least square approach uses node voltage formulation. can handle power, voltage, current measurements. Test results indicate that improve forecasted by using effectiveness branch measurements were also tested.< <ETX...

A branch-current-based three-phase state estimation (SE) method is proposed for distribution systems. The tailored feeders with a few loops. computationally more efficient than the conventional node voltage-based SE methods. To further improve computational efficiency, it shown that systems can be reduced without much loss of accuracy in SE.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

This paper illustrates how a multiagent system (MAS)-based scheme can be developed for control/optimization problem. The prototype problem considered is the dispatching of distributed generators on distribution feeder to provide voltage support. popular control net protocol (CNP) MAS has been adopted facilitate control. that characterization optimal solution necessary in order develop implement. also shows facilitates model-free procedure, as it monitor local sensitivities. Test results,...

This paper proposes a protection scheme which utilizes modern voltage-source converters as fast-acting current-limiting circuit breakers. investigates the main challenges of detecting and localizing fault, interrupting it quickly possible in multiterminal dc system. A system consisting smart relays associated with has been developed. The monitor local quantities to detect isolate disturbances/faults. It is shown that overcurrent-based schemes can be adopted for these meet fast response...

Integrating a battery energy storage system (BESS) with large wind farm can make more dispatchable. This paper focuses on development of control strategy for optimal use the BESS this purpose. The considers an open-loop scheme to incorporate operating constraints BESS, such as state charge limits, charge/discharge current and lifetime. goal is have provide much smoothing possible, so that be dispatched hourly basis based forecasted conditions. effectiveness has been tested by using actual...

Recently, renewable wind energy is enjoying a rapid growth globally to become an important green electricity source replace polluting and exhausting fossil fuel. However, with being uncontrollable resource the nature of distributed induction generators, integrating large-scale wind-farm into power system poses challenges, particularly in weak system. In paper, impact static synchronous compensator (STATCOM) facilitate integration large farm (WF) studied. First, actual two nearby WFs...

The contribution of this paper has been focused on investigating a new microgrid architecture that integrates the solid-state transformer with zonal dc microgrids. By utilizing and ac links transformer, both networks can access distribution system, which renders coordinate management power guarantees high supply reliability. In addition, presented system together proposed strategy minimize effect newly established to existing grid, promises better stability. To end, takes photovoltaic...

This paper shows that the current an inverter interfaced distributed generator (IIDG) contributes to a fault varies considerably, due mainly fast response of its controller. proposes method extend conventional analysis methods so IIDG contribution can be estimated in analysis. The proposed gives rms profiles currents interest (IIDG and protective device will see). Test results, based on prototype feeder, show approach estimate current's contributions under both balanced unbalanced conditions.

This paper investigates the operation and protection issues on distribution systems with high penetration of residential PV systems. Residential represent small scale resources therefore they have different impacts a circuit than larger resources. The considers typical system shows that determining fault current profile voltage variations such becomes more challenging. However, variation are not severe systems, thus, level can be accommodated provided proper revisions made to control schemes.

Short-term electric load modeling and forecasting has been intensively studied during the past 50 years. With emerging development of smart grid technologies, demand side management (DSM) starts to attract attention utilities again. To perform a decent DSM, beyond when how much will be, are facing another question: why is electricity being consumed? In other words, what factors driving fluctuation at particular time period? Understanding this issue can also be beneficial for with purpose...

The solid state transformer (SST) is one of the key elements proposed in National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ldquoFuture Renewable Electric Energy Delivery and Managementrdquo (FREEDM) Systems established 2008. SST used to enable active management distributed renewable energy resources, storage devices loads. In this paper, a 20 kVA based on 6.5 kV IGBT for interface with 12 distribution system voltage. average model control scheme including...

On the basis of voltage level, an electric power system can be viewed as consisting a generation system, transmission and distribution system. The steady-state operation requires that supply, losses, load demand balanced, described by flow equations. configuration network is loop while distributed radial. It well recognized number solutions for networks, if they exist, are multiple. In contrast, it shown here solution with feasible magnitude radial networks always exists unique. These...

This paper focuses on the use of new data available from Advanced Metering Infrastructure (AMI) for real time monitoring and control a distribution system. AMI will provide two type - voltage measurements power demand at customer sites. needs to be processed get an estimate operating condition (i.e, load profile) feeder. The branch current based state estimation (BCSE) method that is adopted this purpose. BCSE specially tailored radial systems summarizes enhancements made adopt so can used...

Summary form only given. Fault current profile on a PV dominated distribution feeder is rather different than conventional feeder. To estimate the fault such feeder, paper proposes new method which extends capability of short-circuit analysis method. The also shows that this time varying makes it more difficult to will take for an overcurrent relay/device interrupt current. estimation operating also. Performance proposed methods has been assessed by simulations sample

A new concept of solid state transformer based microgrid system is presented in this paper. By utilizing 400 V DC bus generated from Gen-I proposed by FREEDM systems center, integration issues and are analyzed. Zonal applied to novel with the consideration burden minimization existing AC grid. The future grid architecture described using integrated system.

This paper proposes new methods to improve the performance of current volt/VAr control schemes at distribution substations. The approach makes use measurement and computer resources that are now available shows supervisory type can be developed both voltage regulator controllers also substation capacitor used substations for control. controller drop characteristics feeders it regulates. uses local real reactive power measurements factor substation.