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A multi-time scale coordinated voltage control strategy in an islanded microgrid (MG) is proposed in this paper. The strategy is comprised of local voltage control of distributed generators (DGs), secondary voltage control (SVC) based on PI regulators and a proposed tertiary voltage control (TVC) strategy. A multi-objective function of the TVC is designed to achieve a compromise among three objectives:...
Challenges in active distribution networks increase as the penetration of DERs grows, causing difficulties for distribution system operators to efficiently manage and plan their networks. One of the main concerns is controlling the limits in voltage profiles that otherwise may lead to load or renewable generation curtailment. One of the promising methods to solve this challenge is through PV inverter...
The massive installation of volatile renewables, decommissioning of conventional power plants as well as large-scale electricity trading create large and unprecedented power transits in Europe's transmission system. To determine the mandatory and cost-effective grid enhancements, extensive power flow studies are necessary. Proprietary software for power flow calculation is available, but automation...
Possibility of decreasing energy losses, caused by mutual influence of nonuniform electric grids, operating in parallel, by means of introduction of phase shift transformer in previously determined optimal branch of the grid and usage of its optimal angle for current operation mode is proved on the example of 230/6 kV electric gride. It is also proved that the application of phase shift transformer...
This paper presents a load flow solution for three phase unbalanced radial distribution feeder using MATLAB/Simulink software. Further a comparison between Simulink load flow analysis and solution provided by IEEE distribution system analysis subcommittee for various configurations has been done. Newton-Raphson method for load flow analysis has been used. The IEEE 13 and 34 node test feeder models...
A promising approach is proposed for extending the appealing features of the CERTS microgrid concept beyond its robust plug-and-play and autonomous control characteristics to include the integration of photovoltaic (PV) microsources with reduced volatility at the grid interface. The steady-state and transient characteristics of a proposed CERTS PV microgrid that incorporates a droop-controlled PV...
Steady state voltage rise problem resulting from the integration of DGs at lower voltage levels can be a major impediment to the growth of distributed generation capacity. With the steady implementation of the smart grid technologies throughout the existing distribution networks, the online voltage control can be achieved. The voltage profile has to be estimated first along the distribution networks...
Dynamic operation of voltage regulator (VR) has been proposed for voltage regulation in a distribution system with large integration of distributed generators (DGs). In conventional voltage control, VR's tap operation is adjusted based on the local bus voltage or voltage at load center. When considerable DGs are interconnected, voltage profile and power flow are not same as that of with conventional...
This paper presents Series Voltage regulator (SVR) placement in the distribution load flow calculations for different static load models for steady-state voltage compensation and loss reduction. The forward and backward sweep algorithm for SVR placement is used. The validity of the proposed model is examined using standard distribution systems consisting of 33 nodes. The best location of SVR for mitigation...
The new reality of smart distribution systems with increasing of remote controlled equipment and generation sources of small and medium sizes brings new challenges for the operation of these systems. The complexity and the large number of nodes in distribution systems require use of methods which can reduce the processing time of algorithms such as power flow, allowing its use in real time. This paper...
The unpredictable nature of load demands at load centers will become more salient as V2G penetration increases. In this paper, the impact of V2G parking lots on substation power capacity and step voltage regulators (SVR) operations are inv estigated. A plethora of various operational scenarios are investigated with the aim to make credible and factual research-bas ed finding. IEEE 13 and IEEE 123...
The IEEE Test Feeders provide a benchmark for the power distribution systems analysis community. This panel summary will provide a discussion of experiences matching the results published by Kersting and Shirek in this panel. [1] Benchmarking the short circuit currents for the Test Feeders is important to users of the Test Feeders for determining whether the system impedances are defined correctly...
The current deregulation trend in the electric power industry has led to the utilities trying to adapt Distributed Generation (DG) into their existing infrastructure. In this paper, 12.47 kV distribution feeders of American Electric Power (AEP) are modeled in OpenDSS to investigate the impacts of PV integration. With increasing PV penetration reverse power may flow on the grid which is associated...
Voltage regulation is an important subject in electrical distribution system. The voltage drop along primary distribution systems has been a crucial operating problem, especially for lengthy feeders, with a significant load concentration at their ends. As the load on a feeder varies the voltage supplied to every customer will also vary. It is the utilities responsibility to keep the customer voltage...
A low voltage (LV) distribution level unified power flow controller (UPFC) is shown capable of regulating the positive sequence voltage with a network while simultaneously correcting phase unbalance voltages that can be produced by high levels of distributed photovoltaic (PV) generation. Instantaneous reactive power theory shows that DC-bus capacitor power will fluctuate at twice mains frequency during...
This paper addresses the negative impacts of distributed generations (DGs) on the utility voltage regulators and hence on the voltage profile of distribution feeders. These negative impacts have been verified through carrying out different simulations on an unbalanced distribution feeder. The results show that a significant regulation problem might arise due to the increased levels of DG penetration...
The integration of smart grid technologies along with improved feeder monitoring capabilities have led to a renewed focus on voltage and reactive power control on power distribution systems. Economic and operational benefits result from effectively managing the voltage profile and feeder power factor. While monitoring, control, and communications technologies are rapidly evolving, the basic tools...
A precise components modeling has a great influence on the power flow calculation. On the basis of the comparison with other algorithms, the backward-forward sweep power flow algorithm is chosen for the power flow calculation of the shipboard power system in the paper. Going with this algorithm, the six detailed component models are introduced, especially three phase transformer models are placed...
This paper describes the modeling of automatically operated local controllers, based on the scheduled, measured or calculated values of the locally affected network equipment in real time operation of Distribution Management System - Control Center. The model presented is operated in unbalanced, unsymmetrical distribution networks and analyzed in phase domain. Simulated Locally controlled equipment...
The quality of the voltage levels in permanent regime demands an optimized electric system, with control of equipments and of the voltage profile in the several load patterns. The allocation and configuration of voltage regulators and capacitor banks become complex tasks, because it is a problem of combinatorial analysis with whole-mixed variables and non-lineal restrictions. With the objective of...
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