As more dc terminals, in the form of links or multiterminal systems, come into operation, the opportunity for controlling ac line flows using the injected dc powers increases. This paper describes a study undertaken to determine the feasibility of using an on-line method to coordinate the dc injections of a multiterminal dc system to ...

Cost($/MWh) Figure 2: 37 Bus Case Generator Supply Curve The dc SCOPF solution contained the same single binding flow solution, the dc power flow was solved using the base case ac power flow generation valuesA Comparison of the AC and DC ...

... Abstract : The theory of magnetohydrodynamic power generators is presented. ... sectional area flows; end losses; AC generation; cycle efficiencies ...

A harmonic power flow program applicable to space power systems with sources of harmonic distortion is described. The algorithm is a modification of the Electric Power Research Institute's HARMFLO program which assumes a three phase, balanced, AC system w...

In this paper, it is described that measurement of fluid flow generated by simultaneous operation of an infrared (IR) laser and AC electric field in a microfabricated channel. When an IR laser (1026 nm) was focused under an intense AC electric field, a circulating flow was generated around the laser focus. The IR ...

Concepts of maximum power transfer of dc systems and associated ac voltage variations, particularly at inverter stations having low short-circuit ratios, have been extended to include various ac load models and an ac line in parallel with the dc line. The operating capabilities are shown to vary from those ...

In present rapid cycling synchrotron magnets ac and dc currents flow in the same coil to give the desired field. The circuit reactance is made zero at dc and the operating frequency by running the magnet in series with an external parallel resonant LC current. We propose to return the ac flux in a gap next to the synchrotron. The dc ...

The Gemini Synchronous inverter is a solid state device that, when interposed between a variable-voltage DC power source and an AC power grid, converts the DC to AC at standard line voltages and frequencies. If more power is available from the DC source than is required by the load, the excess ...

A magnetic demagnetizing device consists of a transformer tapping an a-c line connected by an electronic system that effects and regulates a-c power flow to an exit transformer, the secondary of which is coupled to the demagnetizing coil. (D.C.W.)

A wide range of power system expansion planning techniques require a very large number of solutions for the real power flows in the line for a given transmission network. The use of complete A-C load flow techniques for solving the exact nonlinear equatio...

... 60Hz ac filament voltage and all coolant flows) measurements of the input and output ... up to 1000Hz for at least 90 db below the full power output of ...

Multiterminal dc system offers operational advantages in network reactive power flow control. The var control capabilities of the dc system is of particular interest in this thesis. This thesis presents a formulation for coordinating multiterminal dc syst...

A low voltage DC power-supply is described for an electronic circuit load which comprises: at least one battery; means for regulating the voltage delivered from the battery to the load; and means for charging the battery from AC line power source comprising: means for controlling the charging voltage applied to the battery in function ...

An analogue computer study was made using real power representation. The design of the necessary control for such a dc link brings out implications not only for an isolated turbine but also for any small power system connected to a large dc link where the power flow in the dc link can contribute to the dynamic ...

By making use of the power flow control of dc system, the disturbance in a paralleling ac system may be removed without delay. The control system developed is used to prevent the generator from falling out of step. It was clear that the control system was adoptable for the improvement of the transient stability in the ...

A value-based automated transmission system planning model is presented in this paper and the impact of the various network representations on the results of the model is discussed. Value-based integrated resource planning provides a ``societal cost`` (utility operation and investment costs plus customer outage costs) minimizing composite generation-transmission system expansion plan. The model ...

Sep 3, 2010 ... SUBTOPIC TITLE: Power Management and Storage. PROPOSAL TITLE: Efficient Lightweight AC-AC Power Control for Solar UAV ...

A novel interface circuit between solar cells and commercial ac source using Van Allen`s multivibrator is presented. In this circuit, the ac source is used for a backup of solar cells, and the source and load power flow is automatically balanced by the circuit itself without any external phase control. Based on the ...

This dissertation first develops an efficient solution technique for solving the steady-state electrical conditions of an integrated ac-dc power system based on the observation that the equivalent loads representing the dc network are independent of the ac load-flow solution. The absence of iterations back and ...

This article describes the use of thyristor-based controllers for more efficient and reliable power line performance. The topics of the article include the flexible ac transmission system, linking power systems, limiting parameters for power flow, the static var compensator, the subsynchronous ...

...reported time and duration of power interruptions...equipment. (1) Flow rate meter, suitable for measuring...outlet of the flow rate meter. (e) Procedure...rate with the flow rate meter at intervals not to...the AC line electrical power to the sampler 5...

A harmonic power flow program applicable to space power systems with sources of harmonic distortion is described. The algorithm is a modification of Electric Power Research Institute's HARMFLO program which assumes a three-phase, balanced, ac system with loads of harmonic distortion. The ...

Application of OOP concepts and the C++ programming language to power system simulation has been explored. An efficient platform for power system simulation applications has been proposed. By emulating a physical power lab, a generic power network container has been built. A module, which can be used to solve ...

The present investigation is concerned with dc/ac power conditioning interfaces that employ active waveshaping techniques. It is shown that these interfaces can be accomplished with only one high-frequency transistor/diode switch pair, even if power must flow in both directions. It is noted that the necessary ...

This paper presents the formulation and solution method of an optimal power flow problem using sequential quadratic programming technique for an ac-dc power system with one or more multiterminal dc systems. The economic advantage of being able to coordinate the dc system power transfers is ...

editions including a. ANSI/ASTM B31.1 � Power Piping b. ANSI/ASTM B31.9 � Building Services Piping H Regulations, and all other regulations when working with asbestos-cement pipe. Cutting of AC pipe shall and remove the section of pipe in one piece. The AC pipe must remain wet and encapsulated with 6 ml

... IS BASED ON AN AC METHOD KNOWN IN ... WHEN AC CURRENT FLOWS THROUGH THE SYSTEM, IT ... LAYER AND AN IMPEDANCE OF THE ...

The hvdc system provides an effective means to improve the stability of the ac power system and to control the power system. However, if the hvdc system is connected to a weak ac system, the voltage at the interconnecting point fluctuates very much due to the fluctuation of reactive power ...

Large conducting space structures in low Earth orbit will have a nonnegligible induced potential across their structures. The induced current flow through the body and the ionosphere causes the radiation of Alfven and lower-hybrid waves. This current flow is taken to be ac, and the radiated power is studied as a ...

Large conducting space structures in low Earth orbit will have a nonnegligible motionally induced potential across their structures. The induced current flow through the body and the ionosphere causes the radiation of Alfven and lower hybrid waves. This current flow is taken to be ac, and the radiated power is ...

ehv dc has come into prominence in recent years as a possible economical means of bulk power transmission. Present systems, such as the proposed Pacific Northwest Southwest Intertie, consist of two converter terminals interconnected by a dc transmission line. The source terminal rectifies power from the ac system to dc while the load ...

It is well known that power system transient stability can be improved by utilizing the effects of the power flow in a dc transmission link in a parallel ac--dc power system. The literature describes various control schemes that have been used for this purpose. In a recent experimental study it ...

Page 1. EFFECT OF AC POWER ON EBW DETONATORS Allan H. Herrbach ... 4. TITLE AND SUBTITLE Effect of AC Power on EBW Detonators 5a. ...

Efficient, light-weight power conditioning equipment was investigated in the area of AC to AC transformation, where AC of a variable frequency is to be transformed efficiently into AC of a fixed frequency at a significant power level. This task, which fol...

To consider the characteristics of SMES and to investigate problems on the operations of SMES in power systems, we carried out some experiments on an experimental network. In the network, a small superconducting magnet is connected to a small synchronous generator through a double thyristorized converter and transformers. The generator is connected to the regional ...

The kinesin-microtubule system plays an important role in intracellular transport and is a model system for integrating biomotor-driven transport into microengineered devices. AC electrokinetics provides a novel tool for manipulating and organizing microtubules in solution, enabling new experimental geometries for investigating and controlling the interactions of microtubules ...

Contents: Development of SIT with Current Sensing; Development of Smart Power Module for Automotive Applications; Thrust Needle Bearing Life Presumption Under Eccentric Load for A/C Compressor Application; Application of Variable Hydraulic Flow Rate Contr...

A mechanical occlusive cuff controller suitable for blood flow experiments in space shuttle flights is described. The device requires 115 volt ac power and a pressurized gas source. Two occluding cuff pressures (30 and 50 mmHg) are selectable by a switch ...

Progress in a program for evaluating underground dc transmission systems is reported. A representation of a futuristic development of a large ac power system was used for a basic load flow model. This model will be adjusted to produce three representation...

The author presents a classification of parallel processors and discusses previous EPRI-sponsored work indicating that the array processor holds special promise for use in power systems simulation problems. Operating on this premise, a complete ac power flow code was developed for the floating-point systems AP-120b ...

Increasing demand for low power consumption in electronics combined with continued miniaturization of electronic device components in today's analogue/digital circuits have reduced the supply voltage to sub-one volt levels. The supply voltage to integrated circuit devices are provided by AC-DC converters, which converts high frequency ...

As a candidate for a low ac-loss bulk power transmission cable, a high-{ital T}{sub {ital c}} superconducting wire in a flux-flow state, which is called a {ital flux}-{ital flow} {ital superconductor} here, is theoretically studied. The electrodynamics of such a wire in a self-excited ac field ...

Projects with large offshore wind farms (up to 500 MW) are in progress. Connecting the parks to the power grid with conventional AC transmission technique is difficult due to non-controllable power flow and voltage stability problems. A new concept for connecting remotely located wind farms is suggested and ...

...AC-powered magnet. (a) Identification. An AC-powered magnet is an AC-powered device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue. (b) Classification. Class...

An apparatus for generating AC electrical energy from solar energy is described which comprises: solar panel means for generating DC electrical energy; a DC motor connected to the solar panel means; a housing; a cross-flow turbine in the housing having a shaft and with curved vanes attached thereto and which are submerged in water; an air compressor ...

The paper presents an approach for identifying the most effective Flexible AC Transmission System (FACTS) Controllers, locations, types and ratings that increase asset utilization of power systems. The approach is a combined static/dynamic procedure based on the use of a continuation power flow, and optimal ...

An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has-four pistons and a double duct configuration, with each duct containing sodium potassium liquid metal confined between free ...

An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has four pistons and a double duct configuration, with each duct containing sodium potassium liquid metal confined between free ...

A method is disclosed for controlling a force-commutated inverter coupled between an electrochemical cell and a power grid for adjusting the magnitude and direction of the electrical energy flowing therebetween. Both the real power component and the reactive power component of ac electrical ...

pumps,18,19 or catalytic micropumps.20,21 Some of these micropumps, however, are difficult to fabricate. Alternating current (AC) field micropumps have been reported that create net flow over asymmetric electrode on both sides of the channel creates a micropump that is powered by the global AC field [Fig. 1(a

Matrix converters offer certain advantages over conventional AC-DC-AC conversion such as elimination of reactive elements, inherent bi-directional power flow capability, increased reliability and compactness. This paper explores the reactive and harmonic compensation capability of a matrix converter. Space vector modulation technique ...

The LANL DC load flow model of the VEPCO transmission network shows 210 more substations than the AC load flow model produced by MZA utility Consultants. MZA was requested to determine the source of the difference. The AC load flow model used for this study utilizes 2 standard network ...

Sep 25, 2008 ... Kevin Boyce, HST Systems Engineer, ACS Repair: What failed is a power supply. And in fact, in the ACS there were two power supplies, ...

... 4. TITLE AND SUBTITLE AC COUPLED INTERCONNECT FOR LOW POWER SPACEBORNE ELECTRONICS 5a. ... AC signal I/Os (with TRX) ...

A study of power system operation optimization is presented for the purpose of establishing trends in the evolution of power system operation and to begin development of the tools and techniques required for this evolution. A general technique of using linear optimization and linearization of nonlinear quantities is followed. This study concluded that: the ...

, such techniques are limited by their high laser power require- ments, low achieved flow rates, or poor valve-gel transition temperature; however, as was seen in Fig. 3(a), flow in the valved channel was not completely manipulation offer a flexible, noncontact technique for both fluid ac- tuation and valving. At ...

The conference presents papers on dc-dc power topologies, inverters and cycloconverters, power semiconductor devices, high-power conversion, dc-to-dc converters, systems and simulation, static power converters, ac drives, analysis and controls. Specific topics include 500 V BIMOS technology and ...

In this study, we investigated the etching characteristics and mechanism of an amorphous carbon (a-C) layer for a multi-level resist (MLR) structure. Chemical-vapor-deposited (CVD) a-C layers with a SiO2 hard-mask were etched in an inductively coupled plasma (ICP) etcher by varying the process parameters such as top electrode power, ...

In this paper, a new single-phase to three-phase converter for low-cost ac motor drive is proposed. The proposed converter employs only six switches and incorporates an active input current shaping feature that results in sinusoidal input current at close to unity power factor. The front-end rectifier in the proposed converter permits bidirectional ...

This work is devoted to the investigation of the discharge characteristics of an ac arc plasma torch with a well-type cathode working in air and CO2. The electrical characteristics, plasma jet image and optical emission profile are investigated by varying the discharge power and the gas flow rate. The dynamic behaviour of arc voltage ...

The power modulation of a high voltage direct current (HVDC) system for stabilization of an ac/dc network was investigated. It was found that simultaneous modulation of both dc current and voltage was more effective than just current modulation by itself, since the dc voltage modulation could be used to minimize the reactive power ...

This paper proposes a maximum output power control system of variable-speed small wind generators. Paying attention to an optimum rotational speed of a single phase AC wind generator which can obtain maximum output power according to natural wind speed, the proposed method adjusts the rotational speed of the single phase ...

This is the first of two scoping studies of the Flexible ac Transmission System (FACTS). It investigates the possibility of using high speed thyristor based control of HVAC power system elements to enhance the carrying capacity of existing transmission circuits without compromising reliability. A study system representative of existing ...

... The four technical architectures are: Medium Volt AC Power Generation (MVAC), High Frequency AC Power Generation (HFAC), Medium Voltage ...

Power quality in AC power system depends on the harmonic content of the waveform . To accurately predict the content of harmonic components in a particular ...

Power dissipation is ac induction motor is reduced by circuit that lowers applied voltage when motor