This conference examined the following aspects of 750 to 1500 kV ac power transmission systems and equipment: trends in systems and equipment development; electric field measurements and the consideration of electric fields in EHV and UHV ac system design...

The technical and economic assessment of AC and DC transmission systems; long distance transmission, cable transmission, system inter-connection, voltage support, reactive compensation, stabilisation of systems; parallel operation of DC links with ...

References are contained for HVDC systems, converter stations and components, overhead transmission lines, cable transmission, system design and operations, simulation of high voltage direct current systems, high-voltage direct current installations, and flexible AC ...

... rectifying the AC voltage signals generated by the ... and a source impedance 91 represent the ... Disclosed Method" section, of a transmission line ...

... Abstract : If the presently installed three-phase ac transmission system on aircraft were replaced by a higher voltage dc (HVDC) transmission using ...

It can be said that, with respect to reliability, the dc transmission system studied for Churchill Falls offers the same degree of reliability as the 735 kV ac transmission system. All analog studies whether ac or dc assume, of course, that the equipment conforms to certain ...

HVDC transmission has been found to be an attractive alternative to ac transmission in many situations. Evaluations of HVDC alternatives include technical, economic, environmental and sometimes regulatory considerations which are different than those for ...

This book represents text on HVDC transmission available. It deals with the various aspects of the state of the art in HVDC transmission technology. This book presents many aspects of interactions of AC/DC systems. Modeling and analysis of DC systems are also discussed in detail.

This paper discusses the characteristics of the concept and includes discussion of the system constraints, including traction battery constraints, and brief descriptions of the major subsystems being developed. The components discussed include: the system controller, dc to ac inverter, an internal permanent magnet ...

The fast development of power electronics based on new and powerful semiconductor devices has led to innovative technologies, such as high voltage dc transmission (HVDC) and flexible ac transmission system (FACTS), which can be applied in transmission and distribution ...

A study comparing the results of a digital computer program and an hvdc simulator is reported. The digital computer program permits the study of combined ac-dc systems, and provides a complete representation of one or more hvdc transmission systems in a large scale interconnected ac ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in determining dc ...

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 merits of hvdc and uhv ac transmission systems were discussed at an international conference of Electrical Engineers in London, Nov. 1973. Environmental aspects are discussed in relation to increased power-transmission ratings. Within the next decades, power generation will be concentrated in huge ...

2 33 3 3 1 1 1 1 1 1 2 2 Network of offshore wind farms connected by gas insulated transmission is a GIL? Why GIL? Acknowledgements Network of wind farms Comparison with other transmission systems AC wind farms in one line over the German island Norderney. 3 GIL is an AC ...

This is a collection of papers presented at the 1994 IEEE PES Transmission and Distribution Conference. The topics of the papers include distribution system voltage sags; switchgear; power systems engineering; extruded dielectric distribution cables and accessories; power system harmonics and compensation schemes ...

This working group report presents dc benchmark models tailored to ac/dc interaction. This is to encourage comparisons of the performance of different control strategies or computational tools related to various ac/dc interaction phenomena and system dynamic performance. System data and results are available on ...

The possibility of abnormal harmonic generation in an ac system feeding a converter load is examined from the standpoint of automatic control systems used in modern hvdc transmission systems. It is shown that with certain types of automatic controls, the firing angles of converter valves may ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous ...

The purpose of the study reported here was to examine generic cost differences between direct current (dc) and alternating current (ac) systems and to identify situations in which dc is clearly advantageous for long distance and bulk power transport. The ...

Modulation of power transmitted over a proposed multiterminal dc system to provide effective stability enhancement of a large ac system in the Southwestern U.S. is demonstrated in this paper. This proposed multiterminal dc system connecting the Phoenix, Mead and Los Angeles areas could be in parallel with an Extra ...

The power quality on the transmission lines is less of a concern with an AC system. At the point of use (power distribution) we will need to use Delta to ...

A separate abstract was prepared for each of the three volumes of this report for the Energy Data Base. (RCK)

An application of high speed reclosing for UHV a.c transmission lines is expected to secure high reliability of transmission system. In order to choose dead times of high speed reclosing property, it is necessary to clarify forced extinction characteristi...

References are contained for HVDC systems, converter stations and components, overhead transmission lines, cable transmission, system design and operations, simulation of high voltage direct current systems, high-voltage direct current installations, and ...

This study evaluated the technical and economic suitability of many of the underground power transmission systems that may be available in the 1990's. The systems considered included cellulose-, polyproplyene-, and gas-insulated cables, oil-filled cables and cryogenic cables for 345 kV to 765 kV ac or dc ...

Cleveland Electric Illuminating Co. and Ohio State University present (1) a model of the system involving parallel pipelines and power transmission lines and (2) equations to accurately predict the expected induced voltages on pipelines. Case histories of tests include evaluations of variables influencing induction.

The technical and environmental considerations involved in HVDC Converter Terminal design with respect to the Square Butte HVDC Project are reported. Considerations are encountered in HVDC stations which are not generally familiar to the utility engineer involved with AC systems. Design of the transmission line is not covered.

An overview is presented of some of the areas to be considered in the design and implementation of transmission cables for an Ocean Thermal Energy Conversion (OTEC) power plant. These considerations include choice of ac or dc cable system, voltage level, environmental problems, and selection of insulation. (LCL)

Undersea transmission lines and shoreline AC-DC conversion stations and near-shore transmission lines are being considered as part of a system for transporting energy between the Hawaiian Islands. These facilities will need to be designed so that they wil...

The project proposes construction of additions to BPA's electric transmission system including transmission lines, substations, and related structures; maintenance of existing facilities including repair of equipment, structures, aerial conductors, and ac...

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...

Consultants from three engineering firms discussed problems associated with the transmission of power at higher and higher voltages. They predicted a rapid increase in application of both ac and dc ehv transmission, radical departures in design of circuit breakers, faster relaying, and development of new insulation materials for better ...

This text on DC power transmission includes information on the development and use of DC systems, operation of equipment such as converters and capacitors in transmission circuits, the stability of DC systems and the influence of such systems on the stability of associated ...

Development of techniques and analytical tools for utilizing the inherent controllability of multiterminal hvdc transmission to enhance the performance of an integrated ac/dc power system were explored. Specific investigations that were performed during the course of the project were described, including steady state operation of ...

HVDC transmission was found to be an attractive alternative to ac transmission in many situations. Evaluations of HVDC alternatives include technical, economic, environmental and sometimes regulatory considerations which are different than those for ac transmission. This research project ...

A Handoff Control Scheme Using a Restrictive Transmission for Data Services in DS-CDMA Systems Jin W. Chang and Dan K. Sung Communication Networks Research Laboratory, Dept. of EE, Korea Advanced-42-869-3439, E-mail: dksung@ee.kaist.ac.kr or jwchang@cnr.kaist.ac.kr ABSTRACT A handoff control scheme for data

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 resonance damper, the ...

A ground fault detection and shutoff system for underwater power transmission provides protection to divers from swimming into electric fields. This system uses DC power to monitor the true resistance of the load system rather than the AC power to the loa...

In order to find exactly the permitted difference limits of phase, frequency and magnitude of voltage between both power systems in cases where a separated power system was reparalleled to a trunk transmission line, fundamental experiments were carried ou...

HVDC transmission is increasingly used as a supplement to AC transmission. In order to exploit the versatility of HVDC transmission, the demand for and the quality of performance of telecommunication systems becomes more important. To properly apply a telecommunication ...

A model of generic overhead transmission systems in the range of 362 to 1200 kV ac, and +-400 to +-800 kV dc is developed. Such generic systems are to include (a) transmission from generation to load, and (b) interconnection of two large integrated system...

Research on power delivery alternatives is reported. The first phase of this work was to develop a model of overhead transmission systems in the range of 362 to 1200 kV ac, and +-400 to +-800 kV dc. Such systems included transmission from generation to lo...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in determining dc ...

The case for dc versus ac power transmission is reviewed. It is concluded that for long transmission distances, i.e. more than 800 km (500 miles), dc transmission is cheaper and probably more reliable. The 1.0-MV Pacific Intertie is cited as an example of a modem efficient dc system.

A detailed study is presented of the economics of conventional underground transmission lines utilizing oil-paper insulated pipe-type cables. Three cryogenic ac transmission lines, cooled, respectively, by nitrogen, hydrogen, and helium, are compared with conventional cables and overhead lines. The nitrogen-cooled ...

Eleven papers prepared for presentation at a symposium to be held during 1982 in the USA on scientific cooperation between the US and USSR in the field of research, design and operation of ehv/uhv ac and dc power transmission systems are included. A separ...

Considerable incentives exist for utilities to place hvdc transmission lines along the same right of way as ac lines. One consequence of such an application is steady state induction of fundamental frequency voltages into the dc circuit. The resulting current ripple on the dc converter can cause continuous offset transformer saturation, with many ...

Eleven papers prepared for presentation at a symposium to be held during 1982 in the USA on scientific cooperation between the US and USSR in the field of research, design and operation of ehv/uhv ac and dc power transmission systems are included. A separate abstract was prepared for each paper. (LCL)

To cope with the changing demands of power transmission, the UHV Transmission Development and Promotion Committee was created in 1973 within the Central Electric Power Council (consisting of the nine Japanese electric power companies and the Electric Power Development Company). A research and development program on the next-term power ...

The identification of hardware developments and system applications which exemplify cost and operational advantages of integrated ac/dc power systems is discussed. The three principal tasks undertaken were: assessment of equipment developments; quantification of operational advantages; and interaction with system ...

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 forth between ...

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 was determined that ...

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 ...

The use of compressed gas-insulated equipment in the high voltage transmission network has steadily increased over the recent years. Substations utilizing compressed gas insulation can be placed and used to bring power into urban areas at the full transmission line voltage. Compressed gas-insulated cables have found an increasingly important role in this ...

The high capital cost of dc terminal equipment has in the main confined the use of dc to applications where transmission distances are long or where submarine cables have to be used. An alternative application was studied in which the output of a large generator would be connected into the secondary transmission system by means of a ...

UHV dc transmission is receiving increasing attention as a means of bulk power transmission. From this standpoint, enhancement of UHV dc transmission reliability is important. This problem has not been discussed on a wide basis although the reliability of the ac-dc converter and dc line lightning fault prediction ...

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. ...

In a study conducted by the General Electric Company for EPRI, the power modulation of a high-voltage direct-current (HVDC) system for stabilization of an ac/dc network was investigated. The use of both active and reactive power modulation (as opposed to ...

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 ...