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This paper presents an improved approach for online computation of reactive power contributions from various reactive sources to meet the reactive load demand and reactive power loss based on the network power flow using Y-bus method. The equivalent model of the line is considered by separating the shunt part of the transmission line and integrating into nearby buses for proper accounting of reactive...
This paper describes the methodology employed by Argonne to simulate the potential impact of a nuclear explosion on an electric system serving a large populated city. The method uses a combined deterministic and heuristics-based approach for the analysis. Initially, deterministic steady-state tools, such as load flow and EPfast, are used to explore the possibility of uncontrolled islanding. Heuristics...
The introduction of deregulation in transmission system has give the opportunity for the end user to choose the supplier which lead to the importance of active load and loss allocation in transmission line. Due to the nonlinear character of power flow, it is crucial to allocate the losses and active load. Thus, this paper will propose a technique to allocate both active load and losses in transmission...
With the development of modern power system, extra-high voltage (EHV) AC transmission lines are widely used. Because of large capacitive charging, long EHV AC lines may cause voltage violations in low load period. The leading-phase operation of synchronous generators and switching on shunt reactors are two common measures to relieve voltage violations in low load period. In this paper, we propose...
With the development of smart grid and the increasing penetration of intermittent generation such as wind and solar, transmission network must be operated more effectively and flexible. Transmission switching has been explored in some literature as an effective mean to reduce dispatch cost. In this paper, based on dc optimal power flow we formulate this problem as a bilevel programming problem. The...
Trajectory sensitivity analysis (TSA) is used as a tool for suitable placement of multiple series compensators in the power system. The goal is to maximize the benefit of these devices in order to enhance the transient stability of the system. For this purpose, the trajectory sensitivities of the rotor angles of the most critical generators with respect to the reactances of transmission lines are...
We present a model for analyzing how gradual implementation of distributed generation (DG) in a grid can mitigate carbon dioxide emissions of a utility company. Our model uses the grid parameters and publically available data on the electricity supply and demand of a power company in Northern California: Sacramento Municipal Utility District (SMUD), whose main central power plant uses natural gas...
Generation connected to the transmission system via inverters (electronically coupled generation) is a growing. Utility protection engineers conventionally use impedance matrix algorithms to determine fault current magnitudes and angles, perform coordination studies, and guide relay settings. In transmission protection studies, it has thus far been common practice to exclude the fault current contributions...
Congestion management of power flow in transmission lines using hydroelectric power generation is examined in the scenario where new wind power generation is installed in a power grid. A method is proposed for determining the optimal dispatch of generation output that maximizes transmission margin and minimizes transmission loss under the constraint that the frequency variation is kept within a tolerable...
The electric power grid is one of the most complex engineered systems today. Managing thousands of transmission assets spanning many miles and interconnecting regions and countries together combined with optimizing many generators with complex operating requirements creates a very challenging scheduling problem. Such a challenging problem becomes even more complex with resource uncertainty and stringent...
This paper presents a micro-grid simulator tool useful for implementing and testing multi-agent controllers (SGridSim). As a common engineering practice it is important to have a tool that simplifies the modeling of the salient features of a desired system. In electric micro-grids, these salient features are the voltage and power distributions within the micro-grid. Current simplified electric power...
This paper deals with the phenomenon of electromechanical wave propagation in large power systems. Understanding this phenomenon is necessary for setting up an accurate source localization methodology. At the moment, localization is being performed on the assumption that the electromechanical wave propagation speed is constant — despite the fact that published research has shown that generator inertia...
This paper presents a power flow based approach to transmission fixed cost allocation problem in a pool based electricity market that takes into consideration N-1 secure annual operation. In this pricing approach, the cost of each facility is linked to the highest possible power flow a facility may face under a contingency situation in a year. Charges for each facility are based on the facility usage...
Power transfer between areas is a major function of a running electric power system. However, transmission networks have limited capability to transfer power. The objective of this paper is to present how to determine power transfer capability of transmission lines by a practical method. The proposed method is based on computer simulations of various scenarios of operation under incremental power...
The Z-pinch driven X-ray source is the combinations of the pu lsed-power electrical energy source, transmission line, switch and the wire-array load. It has been proved by many experime nts that the X-ray source produced by Z pinches has wide appl ications on inertial confinement fusion, high energy density sci ence and experimental astrophysics. Full circuit model has bee n developed to simulate...
A multi-terawatt pulsed power facility «Gamma» is being developed in RFNC-VNIIEF. It is planned that facility will consist of 16 independent modules, each being capable of generating electric pulses with peak power up to 1.5 TW. The facility will be used for investigations in the field of radiation physics
A magnetically insulated vacuum transmission line (MITL) is a means by which high currents can be carried from generators to loads. In addition to the current flowing in the negative conductor, the source high voltage propagating along the transmission line causes electron emission into the vacuum which then forms into an electron sheath restrained by magnetic forces to flow along the cathode surface...
The application of Pulsed electric field (PEF) is a method for liquid treatment in the food industry and for water decontamination. To process water and study this phenomenon, we have developed a pulsed high voltage generator. The parent project for this generator is to ascertain the benefits of nanosecond generators over other methods against E. coli and Legionella in water.
Recent studies have shown that dynamic removal of transmission lines from operation ("Transmission Switching") can reduce costs associated with power system operation. Smart Grid systems introduce flexibility into the transmission network topology and enable co-optimization of generation and network topology. The optimal transmission switching (OTS) problem has been posed in on small test...
The design criteria of the preferred power supply (PPS) and its interfaces with the Class 1E power system, switchyard, transmission system, and alternate ac (AAC) source are described. This standard provides PPS requirements for nuclear power plants and guidance in the areas of AAC power source interfaces with PPS, physical independence of the PPS power and control circuits, and expanded PPS criteria...
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