CN114771360B - Alternating current and direct current traction power supply structure and control method for electrified railway - Google Patents
Alternating current and direct current traction power supply structure and control method for electrified railway Download PDFInfo
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- CN114771360B CN114771360B CN202210440695.XA CN202210440695A CN114771360B CN 114771360 B CN114771360 B CN 114771360B CN 202210440695 A CN202210440695 A CN 202210440695A CN 114771360 B CN114771360 B CN 114771360B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
Abstract
The invention discloses an alternating current-direct current traction power supply structure and a control method for an electrified railway, and relates to the technical field of electrified railway power supply. The static var generator can provide running power for a train adopting an alternating current system or a direct current system at the same time, and the coexistence of an alternating current traction power supply system and a direct current traction power supply system in the same traction substation is realized; the measurement and control system MCS consists of a voltage transformer PT, a current transformer CT, a voltage transmitter VD, a current divider RW and a controller CD, calculates the load power of an alternating current bus and the load power of a direct current bus by measuring voltage and current parameters, compares the negative sequence power of the alternating current bus with the negative sequence allowable quantity of the three-phase high-voltage bus, controls the output power of the static reactive power generator in real time, compensates the negative sequence power generated by the load of the locomotive of the alternating current traction power supply system, and enables the negative sequence on the side of the three-phase high-voltage bus to meet the requirements.
Description
Technical Field
The invention relates to the technical field of traction power supply of electrified railways, in particular to an alternating current and direct current traction power supply technology.
Background
At present, 27.5/55kV power frequency single-phase alternating current system or 750/1500V direct current system is commonly adopted in rail transit in China. Due to the difference of power supply systems, the alternating current and direct current traction power supply systems generally adopt independent power supply equipment.
With the rapid development of rail transit, rail transit networks are increasingly complex, urban rail transit and urban railways gradually realize interconnection and intercommunication, and alternating current and direct current traction power supply systems coexist. The alternating current and direct current traction power supply system can be used for alternating current and direct current transition sections in alternating current and direct current double-system lines, can also be used for train manufacturing enterprises, and can be used for testing trains adopting alternating current systems and direct current systems and the like. The alternating current and direct current traction power supply system shares power supply equipment, construction cost can be effectively reduced, resources are saved, and efficient and economic operation is realized, so that research on an alternating current and direct current traction power supply structure is necessary.
Disclosure of Invention
The invention aims to provide an alternating current and direct current traction power supply structure and a control method for an electrified railway, which can effectively solve the technical problem that an alternating current traction power supply system and a direct current traction power supply system coexist in the same traction substation and can compensate negative sequence power generated by alternating current load.
The purpose of the invention is realized by the following technical scheme: an alternating current-direct current traction power supply structure of an electrified railway comprises a three-phase high-voltage bus, a traction transformer TT, a measurement and control system MCS, a static var generator SVG1 and a static var generator SVG2 in a traction substation DCS, wherein the traction transformer TT is of a double-winding three-tap structure, one tap of a primary side second winding is connected to the middle point of a first winding, and three taps of two windings are connected with the three-phase high-voltage bus; two adjacent taps in the two windings on the secondary side are interconnected, the other two taps are respectively connected with an alternating current bus JM, and the phase difference of the voltages led out by the two windings on the secondary side is 90 degrees; the alternating current sides of the static var generator SVG1 and the static var generator SVG2 are respectively connected with two windings on the secondary side of the traction transformer TT in parallel, and the direct current sides are connected with the direct current bus ZM; one end of an alternating current bus JM is connected with a current transformer CT in series and then connected with an OCS, and the other end of the alternating current bus JM is connected with a voltage transformer PT in parallel and connected with a steel rail and grounded; one end of the direct current bus ZM is connected with a shunt RW in series and then is connected with an OCS, and the other end of the direct current bus ZM is connected with a voltage transmitter VD in parallel and is connected with a steel rail and grounded; in the measurement and control system MCS, the output ends of a voltage transformer PT, a current transformer CT, a voltage transmitter VD and a current divider RW are connected with the input end of a controller CD, and the output end of the controller CD is connected to the control ends of a static var generator SVG1 and a static var generator SVG 2.
The static var generator SVG1 and the static var generator SVG2 can simultaneously provide running power for a train adopting an alternating current system or a direct current system, and a traction power supply structure with an alternating current traction power supply system and a direct current traction power supply system in the same traction substation.
When the traction network is in an alternating current traction power supply system, if the power supply mode of the traction network is a direct power supply mode or a direct power supply mode with a return line, one end of an alternating current bus JM is connected to an OCS (online charging system), and the other end of the alternating current bus JM is connected with a steel rail and grounded; if the power supply mode of the traction network is an AT power supply mode, one end of the alternating current bus JM is connected to the OCS, and the other end of the alternating current bus JM is connected with the negative feeder F.
The measurement and control system MCS comprises a voltage transformer PT, a current transformer CT, a voltage transmitter VD, a current divider RW and a controller CD.
Static var generator SVG1, static var generator SVG2 be connected in parallel with the two-phase winding that traction transformer TT secondary side voltage phase difference is 90 respectively, static var generator SVG1 and static var generator SVG2 supply the half of direct current bus load power respectively, and only compensate to the negative sequence power that the alternating current load produced.
Control method of electrified railway AC/DC traction power supply structure, and measurement and control system MCS calculates the load power S of the AC bus by measuring the voltage and current parameters obtained by the AC bus JM and the DC bus ZM L1 DC bus load power S L2 To obtain the negative sequence power of the AC bus
Setting the negative sequence power allowance of the three-phase high-voltage bus as S ε If, if
The negative sequence power is compensated.
When the measurement and control system MCS monitors that the direct current traction power supply system and the alternating current traction power supply system have operation trains, if the alternating current bus load power is in a traction working condition, the direct current bus load power is in a regeneration working condition, or the alternating current bus load power is in the regeneration working condition and the direct current bus load power is in the traction working condition, the operation train in the regeneration working condition can transmit the electric energy generated by the regeneration working condition to an operation train in the traction working condition in another traction power supply system, and the mutual utilization of the regenerated energy of the alternating current traction power supply system and the direct current traction power supply system is realized; the method comprises the following specific steps:
(1) When the load power of the alternating current bus under the traction working condition is smaller than the load power of the direct current bus under the regeneration working condition, or the load power of the direct current bus under the traction working condition is smaller than the load power of the alternating current bus under the regeneration working condition, the measurement and control system MCS controls the static var generator SVG1 and the static var generator SVG2 to be conducted at the same time, one part of the regeneration power is led into the running train under the traction working condition through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT to be effectively utilized, and the rest of the regeneration power is fed back to the three-phase high-voltage bus through the traction transformer TT;
(2) When the load power of the alternating current bus in the traction working condition is more than or equal to the load power of the direct current bus in the regeneration working condition, or the load power of the direct current bus in the traction working condition is more than or equal to the load power of the alternating current bus in the regeneration working condition, the monitoring and control system MCS controls the static var generator SVG1 and the static var generator SVG2 to be conducted at the same time, and the part of regenerated power generated by the running train in the regeneration working condition is preferentially led into the running train in the traction working condition through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT so as to be effectively utilized;
if the load power of the alternating current bus is in a traction working condition, the part with insufficient traction power in the alternating current traction power supply system is guided into the alternating current traction power supply system by a traction transformer TT to be supplied to a running train in the traction working condition;
if the load power of the direct current bus is in a traction working condition, the part with insufficient traction power in the direct current traction power supply system is guided into the direct current traction power supply system by a traction transformer TT, a static var generator SVG1 and a static var generator SVG2 to supply the running train in the traction working condition in a supplementing manner.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can compensate the negative sequence power generated by the load of the locomotive of the alternating current traction power supply system, thereby improving the quality of electric energy;
2. the invention forms the coexistence of an alternating current traction power supply system and a direct current traction power supply system in the same traction substation, reduces the quantity and the variety of power supply equipment, and effectively reduces the construction area and the cost of the traction substation;
3. the invention can realize the mutual utilization of train regenerated energy between the direct-current traction power supply system and the alternating-current traction power supply system, and the residual regenerated energy can be fed back to the three-phase high-voltage bus, thereby improving the utilization rate of the regenerated energy and reducing the energy consumption.
Drawings
Fig. 1 is a schematic view of an ac/dc traction power supply structure according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of an ac/dc traction power supply structure suitable for an AT power supply mode in the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a static var generator SVG according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart of the method for compensating the ac/dc traction power supply of the electrified railway according to the second embodiment of the present invention.
Detailed Description
In order to better understand the inventive idea of the present invention, the working principle of the present invention is briefly explained here: with negative-sequence power allowance S of three-phase high-voltage bus ε For the compensation purpose, the static var generator SVG1 and the static var generator SVG2 are controlled to realize coexistence of an alternating current traction power supply system and a direct current traction power supply system in the same traction substation, and to compensate negative sequence power generated by locomotive loads of the alternating current traction power supply system, so that the negative sequence power on the three-phase high-voltage bus side meets the requirement. The invention is further described with reference to the following figures and detailed description.
Example one
As shown in fig. 1, a first embodiment of the present invention provides an ac/dc traction power supply structure for an electrified railway, including a three-phase high-voltage bus in a traction substation DCS, a traction transformer TT, a measurement and control system MCS, a static var generator SVG1, and a static var generator SVG2, where the traction transformer TT is a double-winding three-tap structure, one tap of a primary-side second winding is connected to a midpoint of a first winding, two taps of the first winding are connected to B and C of the three-phase high-voltage bus, and a tap of the second winding is connected to a tap of the three-phase high-voltage bus; two adjacent taps in the two windings on the secondary side are interconnected, the other two taps are respectively connected with an alternating current bus JM, and the phase difference of the voltages led out by the two windings on the secondary side is 90 degrees; the AC sides of the static var generator SVG1 and the static var generator SVG2 are respectively connected with two windings on the secondary side of the traction transformer TT in parallel, and the DC sides are connected with the DC bus ZM.
When the traction network power supply mode of the alternating current power supply system is a direct power supply mode, one end of the alternating current bus JM is connected to the contact network OCS, and the other end of the alternating current bus JM is connected to the steel rail and grounded, as shown in fig. 1; if the power supply mode of the traction network is an AT power supply mode, one end of the alternating current bus JM is connected to the contact network OCS, and the other end of the alternating current bus JM is connected to the negative feeder F, as shown in fig. 2.
The static var generator SVG1 and the static var generator SVG2 respectively supply half of the load power of the direct current bus, and only compensate the negative sequence power generated by the alternating current load.
In the measurement and control system MCS, the output ends of a voltage transformer PT, a current transformer CT, a voltage transmitter VD and a current divider RW are all connected with the input end of a controller CD, and the output end of the controller CD is connected to the control ends of a static var generator SVG1 and a static var generator SVG 2. As shown in fig. 3, the alternating current link in the static var generator SVG1 and the static var generator SVG2 is connected in series in multiple modules, so that higher input and output voltage levels can be realized, and the direct current link is connected in parallel, so that the direct current voltage can be adjusted.
Example two
As shown in fig. 4, the invention provides a schematic flow chart of an electric railway alternating current-direct current traction power supply compensation method, which comprises the following specific steps:
(1) Setting a compensation target as a negative sequence allowable quantity S of a three-phase high-voltage bus ε 。
(2) The measurement and control system MCS calculates the load power S of the AC bus by measuring the voltage and current parameters obtained by the AC bus JM and the DC bus ZM L1 DC bus load power S L2 To obtain the negative sequence power of the AC bus
If>
Does not compensate for the negative sequence power if->
The negative sequence power is compensated.
(3) When the MCS monitors that only the AC traction power supply system has operation train, if the AC bus load power is in a traction working condition, and
when the traction power is introduced into the alternating current traction power supply system through the traction transformer TT, the static var generator SVG1 and the static var generator SVG2 are not conducted, and the traction power is introduced into the alternating current traction power supply system through the traction transformer TTOperating the train in a traction condition; when/is>
And meanwhile, the static var generator SVG1 and the static var generator SVG2 are conducted at the same time to compensate the negative sequence power, and the traction power is led into the running train in the traction working condition in the alternating current traction power supply system through the traction transformer TT. If the load power of the AC bus is in the regeneration working condition and is->
When the three-phase high-voltage bus is connected, the static var generator SVG1 and the static var generator SVG2 are not conducted, and the regenerative power is fed back to the three-phase high-voltage bus through the traction transformer TT; when/is>
And meanwhile, the static var generator SVG1 and the static var generator SVG2 are conducted simultaneously to compensate the negative sequence power, and the regenerated power is fed back to the three-phase high-voltage bus through the traction transformer TT.
(4) When the monitoring and control system MCS monitors that only the direct-current traction power supply system operates the train, the static var generator SVG1 and the static var generator SVG2 are conducted at the same time, but negative sequence power is not compensated. If the load power of the direct current bus is in a traction working condition, the traction power is led into a running train in the traction working condition in the direct current traction power supply system through a traction transformer TT, a static var generator SVG1 and a static var generator SVG 2. If the load power of the direct current bus is in a regeneration working condition, the regeneration power is fed back to the three-phase high-voltage bus through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT.
(5) When the monitoring and control system MCS monitors that the alternating-current traction power supply system and the direct-current traction power supply system are both running and driving, the static var generator SVG1 and the static var generator SVG2 are conducted simultaneously.
If the AC bus load power and the DC bus load power are both in the traction condition, when the AC bus load power and the DC bus load power are in the traction condition
When the train is in a traction working condition, the negative sequence power is not compensated, and the traction power is led into an alternating current traction power supply system and a running train in a direct current traction power supply system through a traction transformer TT, a static var generator SVG1 and a static var generator SVG 2; when/is>
And compensating the negative sequence power, and leading the traction power into an alternating current traction power supply system and a running train in a traction working condition in a direct current traction power supply system through a traction transformer TT, a static var generator SVG1 and a static var generator SVG 2.
If the AC bus load power and the DC bus load power are both in the regeneration condition, when
When in use, the negative sequence power is not compensated, and the regenerated power is fed back to the three-phase high-voltage bus through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT; when/is>
And compensating the negative sequence power, and feeding the regenerated power back to the three-phase high-voltage bus through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT.
If the AC bus load power is in traction working condition, the DC bus load power is in regeneration working condition, when the AC bus load power in traction working condition is less than the DC bus load power in regeneration working condition, if so, the DC bus load power is in regeneration working condition
Does not compensate for the negative sequence power if->
Compensating negative sequence power, wherein part of regenerative power generated by running trains in regenerative working condition in the direct current traction power supply system passes through a static var generator SVG1, a static var generator SVG2 and tractionThe traction transformer TT is led into an operating train in a traction working condition in an alternating-current traction power supply system to be effectively utilized, and the rest regenerative power is fed back to the three-phase high-voltage bus through the traction transformer TT; when the AC bus load power under the traction working condition is more than or equal to the DC bus load power under the regeneration working condition, if->
Not compensating for negative sequence power if
The negative sequence power is compensated, the part of regenerated power generated by the running train in the regeneration working condition in the direct current traction power supply system is preferentially led into the running train in the traction working condition in the alternating current traction power supply system through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT, so that the part of insufficient traction power in the alternating current traction power supply system is effectively utilized, and the part of insufficient traction power in the alternating current traction power supply system is led into the alternating current traction power supply system through the traction transformer TT to be supplied to the running train in the traction working condition in a supplementing manner.
If the AC bus load power is in the regeneration working condition, the DC bus load power is in the traction working condition, when the DC bus load power in the traction working condition is less than the AC bus load power in the regeneration working condition, if the AC bus load power is in the regeneration working condition
Not compensating for negative sequence power if>
Compensating the negative sequence power, leading part of the regenerative power generated by the running train in the regenerative working condition in the alternating current traction power supply system into the running train in the traction working condition in the direct current traction power supply system through a static var generator (SVG 1), a static var generator (SVG 2) and a Traction Transformer (TT), and effectively utilizing the regenerative power, and feeding the rest regenerative power back to the three-phase high-voltage bus through the Traction Transformer (TT); when the load power of the direct current bus in the traction working condition is more than or equal to that in the traction working conditionIf the AC bus load power of the regeneration working condition is greater than or equal to>
Not compensating for negative sequence power if
The negative sequence power is compensated, the part of regenerated power generated by the running train in the regeneration working condition in the alternating current traction power supply system is preferentially led into the running train in the traction working condition in the direct current traction power supply system through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT, so that the part of insufficient traction power in the direct current traction power supply system is effectively utilized, and the part of insufficient traction power in the direct current traction power supply system is led into the direct current traction power supply system through the traction transformer TT, the static var generator SVG1 and the static var generator SVG2 to supplement and supply the running train in the traction working condition. />
Claims (1)
1. The utility model provides an electrified railway alternating current-direct current pulls power supply structure, includes three-phase high voltage bus, traction transformer TT, measurement and control system MCS, static var generator SVG1 and static var generator SVG2 in pulling the substation DCS, its characterized in that: the traction transformer TT is of a double-winding three-tap structure, one tap of a primary side second winding is connected to the middle point of a first winding, and three taps of two windings are connected with a three-phase high-voltage bus; two adjacent taps in the two windings on the secondary side are interconnected, the other two taps are respectively connected with an alternating current bus JM, and the phase difference of the voltage led out by the two windings on the secondary side is 90 degrees; the AC sides of the static var generator SVG1 and the static var generator SVG2 are respectively connected with two windings on the secondary side of the traction transformer TT in parallel, and the DC sides are connected with a DC bus ZM; one end of an alternating current bus JM is connected with a current transformer CT in series and then connected with an OCS (online charging system), and the other end of the alternating current bus JM is connected with a voltage transformer PT in parallel and connected with a steel rail and grounded; one end of the direct current bus ZM is connected with a shunt RW in series and then is connected with an OCS, and the other end of the direct current bus ZM is connected with a voltage transmitter VD in parallel and is connected with a steel rail and grounded; in the measurement and control system MCS, the output ends of a voltage transformer PT, a current transformer CT, a voltage transmitter VD and a current divider RW are all connected with the input end of a controller CD, and the output end of the controller CD is connected to the control ends of a static var generator SVG1 and a static var generator SVG 2;
the static var generator SVG1 and the static var generator SVG2 can simultaneously provide running power for a train adopting an alternating current system or a direct current system, and form a traction power supply structure with an alternating current traction power supply system and a direct current traction power supply system in the same traction substation;
when the traction network is in an alternating current traction power supply system, if the power supply mode of the traction network is a direct power supply mode or a direct power supply mode with a return line, one end of an alternating current bus JM is connected to an OCS (online charging system), and the other end of the alternating current bus JM is connected with a steel rail and grounded; if the power supply mode of the traction network is an AT power supply mode, one end of the alternating current bus JM is connected to the OCS of the contact network, and the other end of the alternating current bus JM is connected with the negative feeder F;
the measurement and control system MCS comprises a voltage transformer PT, a current transformer CT, a voltage transmitter VD, a current divider RW and a controller CD;
the static var generator SVG1 and the static var generator SVG2 are respectively connected with two-phase windings with 90-degree phase difference of the voltage at the secondary side of the traction transformer TT in parallel, the static var generator SVG1 and the static var generator SVG2 respectively supply one half of the load power of the direct-current bus, and only compensate the negative sequence power generated by the alternating-current load;
the control method of the electrified railway alternating current-direct current traction power supply structure comprises the following steps: the measurement and control system MCS calculates the load power S of the alternating current bus by measuring the voltage and current parameters obtained by the alternating current bus JM and the direct current bus ZM L1 DC bus load power S L2 To obtain the negative sequence power of the AC bus
Setting the negative sequence power allowance of the three-phase high-voltage bus as S ε If, if
Compensating the negative sequence power;
when the measurement and control system MCS monitors that the direct current traction power supply system and the alternating current traction power supply system have operation trains, if the alternating current bus load power is in a traction working condition, the direct current bus load power is in a regeneration working condition, or the alternating current bus load power is in the regeneration working condition and the direct current bus load power is in the traction working condition, the operation train in the regeneration working condition can transmit the electric energy generated by the regeneration working condition to an operation train in the traction working condition in another traction power supply system, and the mutual utilization of the regenerated energy of the alternating current traction power supply system and the direct current traction power supply system is realized; the method comprises the following specific steps:
(1) When the load power of the alternating current bus under the traction working condition is smaller than the load power of the direct current bus under the regeneration working condition, or the load power of the direct current bus under the traction working condition is smaller than the load power of the alternating current bus under the regeneration working condition, the measurement and control system MCS controls the static var generator SVG1 and the static var generator SVG2 to be conducted at the same time, one part of the regeneration power is led into the running train under the traction working condition through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT to be effectively utilized, and the rest of the regeneration power is fed back to the three-phase high-voltage bus through the traction transformer TT;
(2) When the load power of the alternating current bus in the traction working condition is more than or equal to the load power of the direct current bus in the regeneration working condition, or the load power of the direct current bus in the traction working condition is more than or equal to the load power of the alternating current bus in the regeneration working condition, the measurement and control system MCS controls the static var generator SVG1 and the static var generator SVG2 to be conducted at the same time, and the part of regenerated power generated by the running train in the regeneration working condition is preferentially led into the running train in the traction working condition through the static var generator SVG1, the static var generator SVG2 and the traction transformer TT so as to be effectively utilized;
if the load power of the alternating-current bus is in a traction working condition, the part with insufficient traction power in the alternating-current traction power supply system is guided into the alternating-current traction power supply system by a traction transformer TT to be supplied to a running train in the traction working condition;
if the load power of the direct current bus is in a traction working condition, the part with insufficient traction power in the direct current traction power supply system is guided into the direct current traction power supply system by a traction transformer TT, a static var generator SVG1 and a static var generator SVG2 to supply the running train in the traction working condition in a supplementing manner.
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