CA2027292C - Voltage regulating, load levelling and load transfer device for single phase ac electric railways, using batteries - Google Patents
Voltage regulating, load levelling and load transfer device for single phase ac electric railways, using batteriesInfo
- Publication number
- CA2027292C CA2027292C CA002027292A CA2027292A CA2027292C CA 2027292 C CA2027292 C CA 2027292C CA 002027292 A CA002027292 A CA 002027292A CA 2027292 A CA2027292 A CA 2027292A CA 2027292 C CA2027292 C CA 2027292C
- Authority
- CA
- Canada
- Prior art keywords
- busbar
- conversion means
- operably connected
- power
- power conversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A voltage regulation system includes a single phase a.c. supply and an a.c. busbar, connected to the single phase a.c. supply, having at least one variable load connected thereto. A pair of rectifier/converters are adapted to convert a.c.
power to d.c. power and vice versa and an energy storage component is connected to the d.c. busbar.
Thus in periods of low load, excess energy supplied to the a.c. busbar from the a.c. supply is transferred via a first of the pair of recti-fier/converters to the d.c. busbar and stored in the energy storage means, and, in periods of high load, the energy previously stored in the energy storage component is transferred via a second of the recti-fier/converters to the a.c. busbar, supplementing the energy supply to the load.
power to d.c. power and vice versa and an energy storage component is connected to the d.c. busbar.
Thus in periods of low load, excess energy supplied to the a.c. busbar from the a.c. supply is transferred via a first of the pair of recti-fier/converters to the d.c. busbar and stored in the energy storage means, and, in periods of high load, the energy previously stored in the energy storage component is transferred via a second of the recti-fier/converters to the a.c. busbar, supplementing the energy supply to the load.
Description
- VOLTAGE REGULATION/CONVERSION DEVICE AND METHOD
The present invention relates to a voltage regulation/conversion device and method, and in particular to a device and method for regulating an a.c. single phase supply voltage wherein load variations are liable to fluctuate to a relatively large extent, the regulation being achieved by means of the conversion to a d.c. supply for energy storage thereof during low load levels.
The present invention is particularly applicable to electric railways, wherein loads fluctuate as trains move over the railway on constantly changing grades, as they slow for speed restrictions and crossings with other trains, as they slow or stop for signals, and as they accelerate after slowing or stopping. In order to improve the voltage regulation and load factor of electric railway distribution systems, a number of proposals have previously been put forward and implemented.
These include reducing the distance between the high voltage supply substations, providing switching stations between the substations, providing series or shunt connected capacitors to reduce reactive power along the distribution system, and - providing transformer type regulators to provide voltage regulation. Each of these have drawbacks, such as high cost, or adverse effects due to the high consumption of power, etc.
In normal a.c. traction systems, each substation feeds radially to an open midpoint between substations. For trains near the midpoint, there is no contribution from the adjacent substation.
AMD/0205a - 2 -- Even when the nominal voltages are identical, the paralleling of adjacent busbars usually causes undesirable reactive power flows between the busbars. When the three phase high voltage supplies to adjacent substations are essentially in phase, and fast protection is installed, the voltage regulation on the typically 25 kV railway distribution system can be halved, by paralleling the adjacent substations. Such a system is, for example, extensively used by the French national railways, however, the circumstances which would cause adjacent substations on the three phase high voltage system to be sufficiently in phase are unlikely to occur in Australia.
The present invention seeks to provide a voltage regulation system whereby a single phase a.c. supply, such as a railway distribution system can be regulated cost-effectively, by utilising a pair of rectifier/converters and an energy storage means for the storage and later supply of excess energy back to the single phase a.c. distribution system.
In one broad form the present invention provides a voltage regulation system, comprising:
a single phase a.c. supply;
an a.c. busbar, connected to said single phase a.c.
supply, having at least one variable load connected thereto;
a pair of rectifier/converters adapted to convert a.c.
power to d.c. power and vice versa;
an energy storage means connected to said d.c. busbar;
whereby in periods of low load, excess energy supplied to said a.c. busbar from said a.c. suppiy is transferred via a first of said pair of rectifier/converters to said d.c. busbar AMD/0205a - 3 -~ 4 20272q2 and stored in said energy storage means, and, in periods of high load, the energy previously stored in said energy storage means is transferred via a second of said rectifier/converters to said a.c.
busbar, supplementing the energy supply to said load.
In a preferred embodiment, the voltage regulation system further comprises a transformer supply between a.c. busbar and said pair of rectifier/converters.
Also preferably, the voltage regulation system is implemented wherein said energy storage means is either a d.c. capacitor or a chemical storage battery.
Preferably also, said voltage regulation system is implemented wherein said transformer is configured as an auto transformer.
In accordance with a particular embodiment of the invention there is provided a voltage regulation apparatus for use in a power distribution system including an a.c. busbar having at least first and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit, said first a.c. busbar section having a first single phase a.c. power supply connected thereto and said second a.c. busbar section having a second single phase a.c. power supply connected thereto, said voltage regulation apparatus comprising:
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first - 4a -202729~
_ a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c.
busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
In accordance with a further specific embodiment of the invention there is provided a power distribution system comprising:
an a.c. busbar having at least ~irst and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit;
,~
,, .
` - 4b - 20?72~2 a first single phase a.c. power supply operably connected to said first a.c. busbar section;
a second single phase a.c. power supply operably connected to said second a.c. busbar section;
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said stored energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb reactive power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c. busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
.h - 4c -The present invention will become more fully understood from the following detailed description thereof, in connection with the accompanying drawings, wherein:
Fig. 1 shows an implementation of a voltage regulation system in accordance with the present invention; and Fig. 2 illustrates an alternative embodiment of a voltage regulation system, also in accordance with the present invention.
In Fig. 1 is shown an a.c. distribution system, designated 1, connected to an a.c. supply voltage. Connected to the a.c. distribution system are a pair of rectifier/converters 2 and 3, the rectifier/converters 2 and 3 also being connected to a d.c. busbar 4. Also connected the d.c. busbar 4, are shown energy storage means 5 and 6, being ,., 20272~2 chemical batteries and capacitors respectively. Intermediate each of the components are circuit breakers 7.
In operation, during a high voltage period being present on the a.c. busbar 1, excess energy is transferred via a first rectifier/converter 2, or a.c. to d.c. converter, via the d.c.
busbar 4, to one or both of the energy storage devices 5 and 6. Then, during a low voltage period being present on the a.c.
busbar 1, extra energy can be supplied from the energy storage device 5 and 6, via the second rectifier converter 3, or d.c.
to a.c. converter back to the a.c. distribution line 1. This then supplements the previously low a.c. supply voltage being present on the a.c. busbar 1.
To control the operation of the rectifier/converters 2 and 3, control buses 8 may be utilised, which may be controlled from a single or separate remote control points or from the instantaneous system voltage on the a.c. or d.c. line, responding to bring in the operation of the a.c. to d.c.
converter 2 and also the d.c. to a.c. converter 3.
Power electronic converters, such as shown in Fig. 1, as items 2 and 3, are known to be used on mine winders, in steel works, and in links between power systems of different frequencies. It is not however known to use such converters to interchange power between the adjacent but out of phase feeders across the open circuit breaker at the mid point switching station, for instance in electric railways. A force commutating inverter, such as herein described, has the added advantage of being able to control the reactive power generation.
In Fig. 2 is illustrated an alternative embodiment of the AMD/0205a - 5 -20272q2 invention, the features of Fig. 2 similar to those shown in Fig. 1 being designated by like numerals to Fig. 1. The extra feature shown in Fig. 2 is the provision of a transformer 9.
The transformer, having two separate secondary windings 11, consequently has minimal coupling between the secondary windings. By controlling the commutation of the converter, the phase angle of the inverter output can be regulated so that the inverter either generates or absorbs reactive power from the single phase railway distribution system. This generation or absorption of reactive power modifies the quantity of reactive power transmitted from the source substation and hence the voltage regulation throughout the single phase a.c.
distribution system.
The two secondary windings 11 required for this device may be constructed on a common core of a transformer which serves other functions, for example, on the core of an auto transformer.
As with the device of Fig. 1, the device of Fig. 2 may be arranged to function automatically, controlled by the system voltage at the point of installation only, or it may be controlled by common signals from remote control points to produce changes in the performance of the single phase distribution system at locations remote from the point of installation. Such changes may include levelling of the demand of the single phase railway system of the three phase supply, voltage regulation of the single phase a.c. distribution system and power factor control of the single phase a.c. railway distribution system.
AMD/0205a - 6 -20272q2 -. It will be understood that the present invention provides a novel voltage regulation system, which will reduce the operating costs of railway systems, and provides a more regulated supply than the currently available weak radially feed power systems.
It will be understood to persons skilled in the art that numerous variations and modifications are envisaged to the present invention. Such variations and modifications should however be considered to fall within the spirit and the scope of the present invention as hereinbefore described.
AMD/0205a - 7 -
The present invention relates to a voltage regulation/conversion device and method, and in particular to a device and method for regulating an a.c. single phase supply voltage wherein load variations are liable to fluctuate to a relatively large extent, the regulation being achieved by means of the conversion to a d.c. supply for energy storage thereof during low load levels.
The present invention is particularly applicable to electric railways, wherein loads fluctuate as trains move over the railway on constantly changing grades, as they slow for speed restrictions and crossings with other trains, as they slow or stop for signals, and as they accelerate after slowing or stopping. In order to improve the voltage regulation and load factor of electric railway distribution systems, a number of proposals have previously been put forward and implemented.
These include reducing the distance between the high voltage supply substations, providing switching stations between the substations, providing series or shunt connected capacitors to reduce reactive power along the distribution system, and - providing transformer type regulators to provide voltage regulation. Each of these have drawbacks, such as high cost, or adverse effects due to the high consumption of power, etc.
In normal a.c. traction systems, each substation feeds radially to an open midpoint between substations. For trains near the midpoint, there is no contribution from the adjacent substation.
AMD/0205a - 2 -- Even when the nominal voltages are identical, the paralleling of adjacent busbars usually causes undesirable reactive power flows between the busbars. When the three phase high voltage supplies to adjacent substations are essentially in phase, and fast protection is installed, the voltage regulation on the typically 25 kV railway distribution system can be halved, by paralleling the adjacent substations. Such a system is, for example, extensively used by the French national railways, however, the circumstances which would cause adjacent substations on the three phase high voltage system to be sufficiently in phase are unlikely to occur in Australia.
The present invention seeks to provide a voltage regulation system whereby a single phase a.c. supply, such as a railway distribution system can be regulated cost-effectively, by utilising a pair of rectifier/converters and an energy storage means for the storage and later supply of excess energy back to the single phase a.c. distribution system.
In one broad form the present invention provides a voltage regulation system, comprising:
a single phase a.c. supply;
an a.c. busbar, connected to said single phase a.c.
supply, having at least one variable load connected thereto;
a pair of rectifier/converters adapted to convert a.c.
power to d.c. power and vice versa;
an energy storage means connected to said d.c. busbar;
whereby in periods of low load, excess energy supplied to said a.c. busbar from said a.c. suppiy is transferred via a first of said pair of rectifier/converters to said d.c. busbar AMD/0205a - 3 -~ 4 20272q2 and stored in said energy storage means, and, in periods of high load, the energy previously stored in said energy storage means is transferred via a second of said rectifier/converters to said a.c.
busbar, supplementing the energy supply to said load.
In a preferred embodiment, the voltage regulation system further comprises a transformer supply between a.c. busbar and said pair of rectifier/converters.
Also preferably, the voltage regulation system is implemented wherein said energy storage means is either a d.c. capacitor or a chemical storage battery.
Preferably also, said voltage regulation system is implemented wherein said transformer is configured as an auto transformer.
In accordance with a particular embodiment of the invention there is provided a voltage regulation apparatus for use in a power distribution system including an a.c. busbar having at least first and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit, said first a.c. busbar section having a first single phase a.c. power supply connected thereto and said second a.c. busbar section having a second single phase a.c. power supply connected thereto, said voltage regulation apparatus comprising:
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first - 4a -202729~
_ a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c.
busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
In accordance with a further specific embodiment of the invention there is provided a power distribution system comprising:
an a.c. busbar having at least ~irst and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit;
,~
,, .
` - 4b - 20?72~2 a first single phase a.c. power supply operably connected to said first a.c. busbar section;
a second single phase a.c. power supply operably connected to said second a.c. busbar section;
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said stored energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb reactive power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c. busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
.h - 4c -The present invention will become more fully understood from the following detailed description thereof, in connection with the accompanying drawings, wherein:
Fig. 1 shows an implementation of a voltage regulation system in accordance with the present invention; and Fig. 2 illustrates an alternative embodiment of a voltage regulation system, also in accordance with the present invention.
In Fig. 1 is shown an a.c. distribution system, designated 1, connected to an a.c. supply voltage. Connected to the a.c. distribution system are a pair of rectifier/converters 2 and 3, the rectifier/converters 2 and 3 also being connected to a d.c. busbar 4. Also connected the d.c. busbar 4, are shown energy storage means 5 and 6, being ,., 20272~2 chemical batteries and capacitors respectively. Intermediate each of the components are circuit breakers 7.
In operation, during a high voltage period being present on the a.c. busbar 1, excess energy is transferred via a first rectifier/converter 2, or a.c. to d.c. converter, via the d.c.
busbar 4, to one or both of the energy storage devices 5 and 6. Then, during a low voltage period being present on the a.c.
busbar 1, extra energy can be supplied from the energy storage device 5 and 6, via the second rectifier converter 3, or d.c.
to a.c. converter back to the a.c. distribution line 1. This then supplements the previously low a.c. supply voltage being present on the a.c. busbar 1.
To control the operation of the rectifier/converters 2 and 3, control buses 8 may be utilised, which may be controlled from a single or separate remote control points or from the instantaneous system voltage on the a.c. or d.c. line, responding to bring in the operation of the a.c. to d.c.
converter 2 and also the d.c. to a.c. converter 3.
Power electronic converters, such as shown in Fig. 1, as items 2 and 3, are known to be used on mine winders, in steel works, and in links between power systems of different frequencies. It is not however known to use such converters to interchange power between the adjacent but out of phase feeders across the open circuit breaker at the mid point switching station, for instance in electric railways. A force commutating inverter, such as herein described, has the added advantage of being able to control the reactive power generation.
In Fig. 2 is illustrated an alternative embodiment of the AMD/0205a - 5 -20272q2 invention, the features of Fig. 2 similar to those shown in Fig. 1 being designated by like numerals to Fig. 1. The extra feature shown in Fig. 2 is the provision of a transformer 9.
The transformer, having two separate secondary windings 11, consequently has minimal coupling between the secondary windings. By controlling the commutation of the converter, the phase angle of the inverter output can be regulated so that the inverter either generates or absorbs reactive power from the single phase railway distribution system. This generation or absorption of reactive power modifies the quantity of reactive power transmitted from the source substation and hence the voltage regulation throughout the single phase a.c.
distribution system.
The two secondary windings 11 required for this device may be constructed on a common core of a transformer which serves other functions, for example, on the core of an auto transformer.
As with the device of Fig. 1, the device of Fig. 2 may be arranged to function automatically, controlled by the system voltage at the point of installation only, or it may be controlled by common signals from remote control points to produce changes in the performance of the single phase distribution system at locations remote from the point of installation. Such changes may include levelling of the demand of the single phase railway system of the three phase supply, voltage regulation of the single phase a.c. distribution system and power factor control of the single phase a.c. railway distribution system.
AMD/0205a - 6 -20272q2 -. It will be understood that the present invention provides a novel voltage regulation system, which will reduce the operating costs of railway systems, and provides a more regulated supply than the currently available weak radially feed power systems.
It will be understood to persons skilled in the art that numerous variations and modifications are envisaged to the present invention. Such variations and modifications should however be considered to fall within the spirit and the scope of the present invention as hereinbefore described.
AMD/0205a - 7 -
Claims (8)
1. A voltage regulation apparatus for use in a power distribution system including an a.c. busbar having at least first and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit, said first a.c. busbar section having a first single phase a.c.
power supply connected thereto and said second a.c.
busbar section having a second single phase a.c.
power supply connected thereto, said voltage regulation apparatus comprising:
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c.
busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
power supply connected thereto and said second a.c.
busbar section having a second single phase a.c.
power supply connected thereto, said voltage regulation apparatus comprising:
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c.
busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
2. The voltage regulation apparatus as claimed in claim 1, which further comprises a first transformer operably connected between said a.c. to d.c. power conversion means and said first a.c.
busbar section, and a second transformer operably connected between said d.c. to a.c. conversion means and said second a.c. busbar section.
busbar section, and a second transformer operably connected between said d.c. to a.c. conversion means and said second a.c. busbar section.
3. The voltage regulation apparatus as claimed in claim 2, wherein said energy storage means is a device selected from the group consisting of a d.c. capacitor and a chemical storage battery.
4. The voltage regulation system as claimed in claim 3, wherein said variable load comprises an electric train.
5. A power distribution system comprising:
an a.c. busbar having at least first and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit;
a first single phase a.c. power supply operably connected to said first a.c. busbar section;
a second single phase a.c. power supply operably connected to said second a.c. busbar section;
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said stored energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb reactive power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c. busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
an a.c. busbar having at least first and second a.c. busbar sections, each said a.c. busbar section being capable of having at least one variable load operably connected thereto, said first a.c. busbar section being electrically isolated from said second a.c. busbar section by an open circuit;
a first single phase a.c. power supply operably connected to said first a.c. busbar section;
a second single phase a.c. power supply operably connected to said second a.c. busbar section;
a d.c. busbar;
an a.c. to d.c. power conversion means having an input operably connected to said first a.c. busbar section, and having an output operably connected to said d.c. busbar;
a d.c. to a.c. power conversion means having an input operably connected to said d.c.
busbar and having an output operably connected to said second a.c. busbar section;
energy storage means operably connected to said d.c. busbar for storing energy produced from the output of said a.c. to d.c. power conversion means, and for supplying said stored energy to said d.c. to a.c. power conversion means; and control means for controlling the operation of said a.c. to d.c. power conversion means so as to either generate or absorb power between said first a.c. busbar section and said a.c.
to d.c. power conversion means, and for controlling the operation of said d.c. to a.c. power conversion means so as to either generate or absorb reactive power between said second a.c. busbar section and said d.c. to a.c. power conversion means, whereby, in periods of low load, excess power supplied from said a.c. busbar is transferred to said d.c. busbar, and, in periods of high load, the energy stored in said energy storage means is transferred to said a.c. busbar, supplementing the energy to said load, thereby facilitating voltage regulation along said first and second a.c. busbar sections.
6. The power distribution as claimed in claim 5, which further comprises:
a first transformer operably connected between said a.c. to d.c. power conversion means, and said first a.c. busbar section, and a second transformer operably connected between said d.c. to a.c. power conversion means and said second a.c. busbar section.
a first transformer operably connected between said a.c. to d.c. power conversion means, and said first a.c. busbar section, and a second transformer operably connected between said d.c. to a.c. power conversion means and said second a.c. busbar section.
7. The power distribution system as claimed in claim 6, wherein said energy storage means is a device selected from the group consisting of a d.c.
capacitor and a chemical storage battery.
capacitor and a chemical storage battery.
8. The power distribution system as claimed in claim 7, wherein said variable load comprises an electric train.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU52490/90A AU639914B2 (en) | 1989-04-04 | 1990-04-02 | Voltage regulation/conversion device and method |
| CA002027292A CA2027292C (en) | 1989-04-04 | 1990-10-10 | Voltage regulating, load levelling and load transfer device for single phase ac electric railways, using batteries |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPJ350789 | 1989-04-04 | ||
| AUPJ642889 | 1989-09-19 | ||
| AU52490/90A AU639914B2 (en) | 1989-04-04 | 1990-04-02 | Voltage regulation/conversion device and method |
| CA002027292A CA2027292C (en) | 1989-04-04 | 1990-10-10 | Voltage regulating, load levelling and load transfer device for single phase ac electric railways, using batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2027292C true CA2027292C (en) | 1995-07-04 |
Family
ID=27423426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002027292A Expired - Fee Related CA2027292C (en) | 1989-04-04 | 1990-10-10 | Voltage regulating, load levelling and load transfer device for single phase ac electric railways, using batteries |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU639914B2 (en) |
| CA (1) | CA2027292C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004016034A1 (en) * | 2004-03-30 | 2005-10-20 | Alstom Technology Ltd Baden | Electrical system for coupling a power supply network and a central DC voltage line and method for operating such a system |
| FR2919768A1 (en) * | 2007-08-03 | 2009-02-06 | Alstom Transport Sa | METHOD OF SUPPLYING AUXILIARY EMERGENCY LOADS, AUXILIARY CONVERTER AND RAILWAY VEHICLE FOR THIS METHOD. |
| DE102010022043A1 (en) * | 2010-05-26 | 2011-12-01 | Siemens Aktiengesellschaft | Energy storage in the field of electrical energy transmission and distribution |
| EP3073596A1 (en) * | 2015-03-25 | 2016-09-28 | Nxp B.V. | Voltage control using rectifying circuitry |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU635605B2 (en) * | 1990-01-26 | 1993-03-25 | Butler Solar Systems Pty Ltd | Method for transmitting electrical energy |
| AU642567B2 (en) * | 1991-01-04 | 1993-10-21 | Butler Solar Systems Pty Ltd | A method of transmitting electrical energy |
| CN104538959A (en) * | 2015-01-06 | 2015-04-22 | 国家电网公司 | Method for assessing high voltage distribution network load transfer capacity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU635605B2 (en) * | 1990-01-26 | 1993-03-25 | Butler Solar Systems Pty Ltd | Method for transmitting electrical energy |
-
1990
- 1990-04-02 AU AU52490/90A patent/AU639914B2/en not_active Ceased
- 1990-10-10 CA CA002027292A patent/CA2027292C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004016034A1 (en) * | 2004-03-30 | 2005-10-20 | Alstom Technology Ltd Baden | Electrical system for coupling a power supply network and a central DC voltage line and method for operating such a system |
| FR2919768A1 (en) * | 2007-08-03 | 2009-02-06 | Alstom Transport Sa | METHOD OF SUPPLYING AUXILIARY EMERGENCY LOADS, AUXILIARY CONVERTER AND RAILWAY VEHICLE FOR THIS METHOD. |
| EP2020726A3 (en) * | 2007-08-03 | 2009-12-16 | Alstom Transport S.A. | Method of powering emergency auxiliary loads, auxiliary converter and railway vehicle for this method |
| DE102010022043A1 (en) * | 2010-05-26 | 2011-12-01 | Siemens Aktiengesellschaft | Energy storage in the field of electrical energy transmission and distribution |
| EP3073596A1 (en) * | 2015-03-25 | 2016-09-28 | Nxp B.V. | Voltage control using rectifying circuitry |
| CN106026701A (en) * | 2015-03-25 | 2016-10-12 | 恩智浦有限公司 | Voltage control using rectifying circuitry |
| US9843198B2 (en) | 2015-03-25 | 2017-12-12 | Nxp B.V. | Voltage control using rectifying circuitry |
| CN106026701B (en) * | 2015-03-25 | 2020-01-03 | 恩智浦有限公司 | Voltage control using rectifier circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| AU639914B2 (en) | 1993-08-12 |
| AU5249090A (en) | 1990-10-11 |
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| MKLA | Lapsed |