This patent describes a static converter system operating between opposite ones of respective AC and DC buses. It comprises: at least three rectifier bridges connected in parallel to the DC buses, each rectifier bridge having three AC lines connected to the middle point of two rectifier devices in series between the two DC buses, the ...

by the rectifier. The de- sired operating mode where the IGBTs are turned off at zero current is below resonance, i and the AC line current, when the converter is operated as a high-power- factor rectifier. In Fig. 12(aHALF-CYCLE CONTROL OF THE PARALLEL RESONANT CONVERTER OPERATED AS A HIGH POWER FACTOR RECTIFIER

while maintaining a constant voltage across the dc link capacitors. For positive ac line voltage vs-phase half-bridge UPS inverters. A traditional half-bridge converter and two recently introduced ac on the switches, and capability of voltage balance control of the dc bus capacitors. Analytical and experimental

When an unbalanced fault occurs in the ac line in the ac-dc link system, the ac voltage and current of the converters become unbalanced. If the unbalance of the converter ac voltage is large, the dc current is interrupted or does not flow. If the unbalance of the commutation voltages is small, the ...

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 ...

This paper presents a single transistor dc-dc converter that combines both forward and flyback action. The resulting circuit is ohmically isolated and can operate over a wide range of input-to-output voltage ratios. An analysis of the circuit indicates that the forward and flyback portions of the circuit interact to produce three distinct regions of operation. With the design ...

Distribution analysis of lightning and switching surges is one of the most basic tasks in designing the insulation level of hvdc converter stations. Nevertheless, little study has been done so far on this problem and, in particular, no measured data are available at present. An analysis is given of the potential distribution in a hvdc converter station ...

With the development of the superconducting magnet as an energy storage unit, pulsed power loads between superconducting magnets of increasing magnitude up to several hundred megawatts or more appear within the realm of possibility. An energy storage unit that is independent of the power grid can be used in applications where the pulsed power required from the power grid may cause a hazardous ...

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output ...

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output ...

A thyristor-based inverter/charger for use in electric passenger vehicles is described, and prototype charger test results are presented. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The integral charger employs the inverter commutation components as a resonant ac/dc converter rated at 3.6 kW. The resulting ...

An economical multichannel power supply (+5 V at 30 A, {minus}5 V at 1.5 A, and {plus minus} 12 V at 1.5 A) is described that is based on a transistor voltage converter with intermediate frequency conversion that operates by pulse-width modulation at a conversion frequency of 20 kHz. The power supply is easily connected and has short-circuit and current overload protection in ...

This patent describes an improved energy efficient control system in conventional air-conditioning and heat pump system. The systems normally including a compressor means, a compressor motor for operating the compressor means, a compressor contactor for turning the compressor motor on and off, an evaporator means, a conditioned air delivery blower fan, a blower fan motor for driving the blower ...

This paper describes circuit topologies for 3-phase pulse-width modulation (PWM) boost rectifiers that operate with a unity fundamental power factor and a low-distortion ac line current. Overlap delays between the switching of the upper and lower devices in a PWM rectifier leg are not critical and diodes eliminates the possibility of the dc-link capacitor ...

The power system of Hydro-Quebec has a peak load of approximately 27 GW. The great distance between the production sites and the load centers introduces stability limitations, which is the reason why the Quebec grid cannot be economically synchronized (through ac transmission with limited capacity) with the U.S. northeastern network. Power exports are therefore dependent on the use of HVDC links ...

This patent describes a battery charge composed of a number of interrelated components. The first component is a means for developing DC voltage from AC line voltage. An integral part of the system is a switching means, including a transformer and a pair of field effect transistors connected in half-bridge configuration, for chopping DC voltage to produce ...

Device detects interruption of ground connection in three-wire electrical equipment and shuts off ac

... entirely by a suitable ac operated dc supply, provided adequate insulation to ground or ac line is maintained. ... Galvanometer with Capacitor: ...

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 dynamically control ...

The design and test results of a thyristor based inverter/charger are discussed. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The resulting charger provides electrical isolation between the vehicle propulsion battery and ac line and is capable of charging a 25 kWh propulsion battery in 8 ...

In robotized industrial plants it is possible to use electric motors in the technological process and also for control, assembly, transport, testing, and measurements. Particularly suitable for these applications are permanent-magnet d.c. motors. A new special series was developed for industrial robots with hinge joints in kinematic pairs. The complete drive includes thyristors or transistor ...

Electrophysiological studies of the effects of electrical brain stimulation have to contend with stimulus artifacts, which complicate both the maintenance of recorded neuron waveforms at recording time, and the post-hoc analysis of the data. The artifacts can be removed by digitally averaging some or all of the (stereotypic) artifact waveforms across artifacts, and then subtracting the resulting ...

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 of the net current ...

A method is developed and validated for calculating the wave resistance of an overhead line with dropped middle phase; it is of interest in new versions of extra- and ultrahigh-voltage ac lines.

In this dissertation, two major accomplishments are achieved. First, the feasibility of a proposed Wyoming to California HVDC system having the ratings of 1000 MW, �500 kV, 2 kA, 860 miles and 12-pulse bipolar lines is shown for exporting Wyoming's electrical power resources to the heavy loaded western states. The second and the main objective of this dissertation is the development of a Kalman ...

previously developed to estimate the capacitor lifetime with ac line inductors [9] can be used for ASD in Table III provide useful estimates for predicting the capacitor lifetime as they did with ac line. Pixler, "Modeling and analysis of dc link bus capacitor and inductor heating effect on ac drives (Part I

The purpose of this study was to develop an assessment of the national utility system`s needs for electric transmission during the period 1995-2020 that could be met by future reduced-cost HVDC systems. The assessment was to include an economic evaluation of HVDC as a means for meeting those needs as well as a comparison with competing technologies such as ac transmission with and without Flexible ...

Probing the frontiers of particle physics and delving into the mysteries of the universe and its beginnings require machines that can accelerate beams of fundamental particles to very high energies and then collide those beams together, producing a multitude of exotic subatomic particles. The proposed Next Linear Collider (NLC), being developed by Stanford Linear Accelerator Center (SLAC), ...

Database, 2003, http://www.nerc.com/~esd/2003Brochure.pdf" "Notes:" "1 Circuit miles of AC lines 230 kV and above." "2 Data includes both existing and planned transmission lines"...

Database, 2005, http://www.nerc.com/~esd/Brochure.pdf" "Notes:" "1 Circuit miles of AC lines 230 kV and above." "2 Data includes both existing and planned transmission lines"...

Feedthrough of interference from the AC power line into accelerator components is a problem which in pulsed accelerators can be reduced by operation synchronous with the AC line. This means of avoiding line-frequency effects is ineffective for continuous ...

A report of a trip arranged for a group of senior Canadian business executives and sponsored by the State Committee for the Coordination of Scientific Research, Union of Soviet Socialist Republics is given. Russian plans to construct a 750 kV ac line are briefly mentioned.

and Demand Database, 2005, http://www.nerc.com/~esd/Brochure.pdf Notes: 1 Circuit miles of AC lines 230 kV and above. 2 Data includes both existing and planned transmission lines...

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.)

This report strives to define the various environmental effects associated with HVDC lines, discusses the current knowledge of their potential effects on biological and non-biological systems, and compares these effects associated with ac lines where appropriate.

The electrical effects of power transmission lines and the effects that such lines may have on man and his environment are described. The electric effects include corona discharges, electric and magnetic field effects of ac lines, and induced currents and...

is the quality factor. When using a voltmeter to measure the rms value of a voltage, the maximum peak voltage the output voltage with the HP3400 true rms voltmeter. Repeat for the other filters. AC Line Corruption Use

A switching circuit for an alternating current line allows the voltage or current coupled from the line to a load circuit to be controlled. Control may be in response to changes in voltage or current coupled as a feedback signal from the load to a switchi...

...powered, it must comply with the AC line conducted requirements found in § 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module...

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 predicted from either a Thevenin ac source model ...