CN113691009A - Power supply system of subway main substation power supply and closed loop control method - Google Patents
Power supply system of subway main substation power supply and closed loop control method Download PDFInfo
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- CN113691009A CN113691009A CN202110973921.6A CN202110973921A CN113691009A CN 113691009 A CN113691009 A CN 113691009A CN 202110973921 A CN202110973921 A CN 202110973921A CN 113691009 A CN113691009 A CN 113691009A
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- bus
- incoming line
- circuit breaker
- power supply
- circuit
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
Abstract
The invention discloses a power supply system of a subway main substation power supply, which comprises a first incoming line circuit, a first section of bus, a second incoming line circuit, a second section of bus, a bus coupler circuit breaker and a synchronization detection device, wherein the first incoming line circuit is connected with the first section of bus; the first incoming line circuit is connected with the first section of bus and used for supplying power to the first section of bus; the second incoming line circuit is connected with the second section of bus and used for supplying power to the second section of bus; the input end of the synchronization detection device is used for receiving voltage parameters of the first incoming line circuit side and the second incoming line circuit side; and the output end of the synchronization detection device is connected with a protection device of the bus tie circuit breaker. The invention provides a power supply system of a main transformer substation power supply and a loop closing control method, wherein synchronous detection equipment is added in a main transformer substation bus-bar cabinet, if the amplitude values of power supply voltages of two paths of incoming line circuits are equal and the phase sequences are consistent, a loop closing mode is adopted to ensure that two sections of buses of 40.5kV at the low-voltage side of the main transformer substation are electrified when any path of main transformer low-voltage side incoming line power supply is stopped.
Description
Technical Field
The invention relates to a power supply system of a subway main substation power supply and a loop closing control method.
Background
At present, in the operation of a low-voltage side 40.5kV switch cabinet of a main substation of a domestic subway project, two incoming lines and a bus-coupled switch cabinet are basically configured, and in a normal power supply system, two incoming lines respectively supply power to two sections of buses; if the power supply of the high-voltage line is required to be powered off, the isolating switch and the circuit breaker of the incoming line switch cabinet are required to be separated, corresponding switches on the bus coupler and the bus coupler isolating switch cabinet are closed through bus coupler spare power automatic switching or manual operation, and operation of two sections of buses of the incoming line is completed. When the other incoming line is in power, the normal power supply mode needs to be recovered, the breaker of the bus-coupled switch cabinet is separated (if a cold standby mode is adopted, the bus-coupled cabinet and the isolating switch on the isolating switch cabinet need to be separated), the isolating switch and the breaker on the incoming line switch cabinet are closed, and at the moment, the two sections of buses respectively run in an electrified mode.
At present, the protection logic for starting the backup power automatic switching bus coupler switch when one power supply is in power failure operation and one power supply is in power failure is relatively mature, or the power failure of the incoming line switch cabinet and the bus coupler switch switching can be smoothly realized through manual operation. However, when one path of incoming line power supply fails or another path of incoming power supply is supplied with electricity, no matter whether the corresponding switch of the bus coupling cabinet or the corresponding switch of the sub-bus coupling cabinet is closed, a section of bus power failure condition can occur at this time, because on-site judgment and operation time need to be considered, and manual operation is adopted, the operation time is longer, the power failure time can be longer, the condition that one section of bus power failure occurs for a period of time can exist in the main line substation, the subway power supply is abnormal, and the subway normal operation is influenced. Along with the large-area power supply mode of a subway power supply system, and the selected site of a main substation is close to a suburb, a group of outgoing line cabinets of the main substation are provided with a plurality of main line substations, the power supply mode needs stable operation of the power supply system, and large-area power failure can be caused when a problem occurs all the way, so that serious consequences are brought.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a power supply system and a loop closing control method for a power supply of a main substation of a subway, wherein synchronous detection equipment is additionally arranged in a main substation combined cabinet, and if the amplitude values of the power supply voltages of two paths of incoming circuits are equal and the phase sequences are consistent, a loop closing mode is adopted to ensure that two sections of buses of 40.5kV at the low-voltage side of the main substation are electrified.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a power supply system of a subway main substation power supply comprises a first incoming line circuit, a first section of bus, a second incoming line circuit, a second section of bus, a bus coupler circuit breaker and a synchronization detection device;
the first incoming line circuit is connected with the first section of bus and used for supplying power to the first section of bus;
the second incoming line circuit is connected with the second section of bus and used for supplying power to the second section of bus;
the input end of the synchronization detection device is used for receiving voltage parameters of the first incoming line circuit side and the second incoming line circuit side;
the output end of the synchronization detection device is connected with the protection device of the bus coupler circuit breaker, and the synchronization detection device judges whether the first incoming line circuit and the second incoming line circuit have synchronization according to the acquired voltage parameters and sends a judgment signal to the protection device of the bus coupler circuit breaker;
the bus coupler circuit breaker is connected between the first section of bus and the second section of bus and used for carrying out loop closing operation when one incoming line has power failure.
Further, first inlet wire circuit includes first transformer, first voltage transformer and first circuit breaker, the output of first transformer links to each other with the input of first circuit breaker, first voltage transformer connects in parallel between first transformer and first circuit breaker, the output of first circuit breaker links to each other with first section generating line, first voltage transformer's secondary output links to each other with the input of examining the contemporary device, first voltage transformer is used for gathering the voltage parameter of first inlet wire circuit line side.
Further, the second inlet wire circuit comprises a second transformer, a second voltage transformer and a second circuit breaker, wherein the output end of the second transformer is connected with the input end of the second circuit breaker, the second voltage transformer is connected between the second transformer and the second circuit breaker in parallel, the output end of the second circuit breaker is connected with a second section bus, the secondary output end of the second voltage transformer is connected with the input end of the synchronous detection device, and the second voltage transformer is used for collecting voltage parameters of the line side of the second inlet wire circuit.
A closed loop control method of a power supply system of a subway main substation comprises the following steps:
step S1, collecting voltage parameters of the first incoming line circuit line side through a first voltage transformer, and collecting voltage parameters of the second incoming line circuit line side through a second voltage transformer;
step S2, performing synchronization parameter detection on the two incoming line circuits according to the acquired voltage parameters through a synchronization detection device, and judging whether the two incoming lines meet a loop closing condition;
and step S3, if the loop closing condition is met, operating the circuit breakers of the two incoming lines according to loop closing control logic, then placing the bus coupler circuit breaker in a closing position to connect the two buses, then placing the first circuit breaker of the first incoming line circuit needing power failure in a separating position, and keeping the second circuit breaker of the second incoming line circuit in the closing position to finish the loop closing operation.
Further, in step S2, the synchronization detection is performed on the two incoming lines according to the voltage parameter by the synchronization detection device, and whether the two incoming lines satisfy the loop closing condition is determined, including the following steps:
step S21, the first voltage transformer sends the collected voltage parameters of the first incoming line circuit line side to a synchronization device;
step S22, the second voltage transformer sends the collected voltage parameters of the second incoming line circuit side to a synchronization device;
and step S23, the synchronization detection device sets the parameter constant values of the amplitude and the phase sequence, judges whether each voltage parameter of the two incoming lines meets the constant value or not, and outputs the result of synchronization judgment to the protection device of the bus-coupled circuit breaker, wherein the result of synchronization judgment comprises the condition of meeting or not meeting the condition of closing.
Further, in step S3, the operation of the loop closing control logic for the circuit breakers with two incoming lines includes the following steps:
step S31, when power failure operation needs to be carried out on the first incoming line circuit, the first breaker receives a brake-off operation command;
step S32, the protection device of the first circuit breaker sends a switching-off command to the protection device of the bus-coupled circuit breaker, and after receiving the switching-off command, the protection device of the bus-coupled circuit breaker judges a synchronism judgment result output by the synchronism detection device and judges whether a closed loop operation condition is met;
and step S33, when the synchronism judgment result is that the closing is met, meeting a closing ring condition, executing closing operation by the bus-coupled circuit breaker, sending a closing signal to a protection device of a first circuit breaker, and controlling the first circuit breaker to execute a switching-off command.
By adopting the technical scheme, the synchronization detection device detects whether the two incoming lines meet the loop closing condition, and the two bus incoming lines are closed by the bus coupler circuit breaker under the condition that the loop closing condition is met, so that the power failure of one incoming line power supply under the condition that the buses are not powered off is realized, the power failure and other operations of multiple substations on the subway main line are avoided due to the fact that the buses are not powered off, the uninterrupted power supply in the subway operation is realized, and the power supply mode is more stable.
Drawings
FIG. 1 is a schematic block diagram of a power supply system of a main substation of a subway of the present invention;
FIG. 2 is a secondary wiring diagram of the power supply system of the main substation of the subway of the invention;
fig. 3 is a flowchart of a closed loop control method of a power supply system of a main substation of a subway of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Example one
As shown in fig. 1 and 2, in the power supply system of the main substation of the subway of the present embodiment, under the condition that two incoming line switch cabinets of the substation respectively have one bus to operate, the power supply system of the main substation of the subway includes a first incoming line circuit, a first bus, a second incoming line circuit, a second bus, a bus coupler circuit breaker and a synchronization detection device.
The first incoming line circuit of this embodiment includes first transformer, first voltage transformer and first circuit breaker, the output of first transformer links to each other with the input of first circuit breaker, first voltage transformer connects in parallel between first transformer and first circuit breaker, the output of first circuit breaker links to each other with first section generating line, first voltage transformer's secondary output links to each other with the input of examining the contemporary device, first voltage transformer is used for gathering the voltage parameter of first incoming line circuit line side. When the normal power supply, first circuit breaker is in closing the position, and first transformer normally supplies power for first bus.
The second inlet wire circuit of this embodiment includes second transformer, second voltage transformer and second circuit breaker, the output of second transformer links to each other with the input of second circuit breaker, second voltage transformer connects in parallel between second transformer and second circuit breaker, the output of second circuit breaker links to each other with second section bus, second voltage transformer's secondary output links to each other with the input of examining the contemporary device, second voltage transformer is used for gathering the voltage parameter of second inlet wire circuit line side. And when the power is normally supplied, the second breaker is in a closed position, and the second transformer normally supplies power to the second bus.
The secondary output end of the first voltage transformer and the secondary output end of the second voltage transformer of the embodiment are respectively connected with the input end of the inspection synchronizing device, the output end of the inspection synchronizing device is connected with the protection device of the bus tie circuit breaker, the inspection synchronizing device is used for judging whether the first incoming line circuit and the second incoming line circuit have synchronism or not according to the collected voltage parameters, and sending the judgment result signal of the synchronism to the protection device of the bus tie circuit breaker.
The bus tie circuit breaker of this embodiment is connected between first bus and second bus, and during normal power supply, the bus tie circuit breaker is in the branch position, and first bus and second bus do not communicate. When one of the incoming lines needs to be powered off, the bus coupler circuit breaker is in a closed position, so that the first bus and the second bus are communicated, and bus connection operation is carried out.
Example two
As shown in fig. 3, the present embodiment provides a loop closing control method for a power supply system of a main substation, and takes the first incoming line circuit as an example, the loop closing control method includes:
step S1, under the condition that two paths of incoming line switch cabinets of the substation respectively have one path of buses to operate, when one path of incoming line circuit needs to be powered off, acquiring voltage parameters of the first incoming line circuit through the first voltage transformer, and acquiring voltage parameters of the second incoming line circuit through the second voltage transformer.
Step S2, performing synchronization parameter detection on the two incoming line circuits according to the collected voltage parameters by the synchronization detection device, and determining whether the two incoming lines satisfy the loop closing condition, where the synchronization parameter detection in this embodiment specifically includes the following steps:
step S21, the first voltage transformer sends the collected voltage parameters of the first incoming line circuit line side to a synchronization device;
step S22, the second voltage transformer sends the collected voltage parameters of the second incoming line circuit side to a synchronization device;
and step S23, the synchronization detection device sets parameter fixed values of amplitude and phase sequence, judges whether each voltage parameter of the two incoming lines meets the fixed value, and outputs a synchronization judgment result to a protection device of the bus-coupled circuit breaker, wherein the phase sequence is qualified if the amplitude error is not more than 10%, and the phase sequence is the same phase sequence if the phase sequence is not more than 10 degrees, and the synchronization judgment result comprises the condition of meeting or not meeting the condition of closing.
And step S3, if the loop closing condition is met, operating the circuit breakers of the two incoming lines according to loop closing control logic, then placing the bus coupler circuit breaker in a closing position to connect the two buses, then placing the first circuit breaker of the first incoming line circuit needing power failure in a separating position, and keeping the second circuit breaker of the second incoming line circuit in the closing position to finish the loop closing operation. The operation of the circuit breaker of the two incoming lines according to the closed loop control logic specifically comprises the following steps:
step S31, when power failure operation needs to be carried out on the first incoming line circuit, the first breaker receives a brake-off operation command;
step S32, the protection device of the first circuit breaker sends a switching-off command to the protection device of the bus-coupled circuit breaker, and after receiving the switching-off command, the protection device of the bus-coupled circuit breaker judges a synchronism judgment result output by the synchronism detection device and judges whether a closed loop operation condition is met;
step S33, when the result of the synchronism judgment is that the closing is satisfied, the closing condition is satisfied, the bus coupler circuit breaker executes the closing operation, and sends a closing signal to a protection device of a first circuit breaker, and controls the first circuit breaker to execute a switching-off command, and the closing operation and one-path power supply power failure operation are completed;
if the synchronism judgment result is that the closing is not satisfied, the closing loop condition is not satisfied, the protection device of the bus-coupled circuit breaker sends the signal to the protection device of the first circuit breaker needing power failure, and at the moment, the first circuit breaker executes other power failure operation modes (such as spare power automatic switching, manual operation and the like).
The above embodiments are provided to further explain the technical problems, technical solutions and advantages of the invention in detail, it should be understood that the above embodiments are only exemplary embodiments of the invention and are not intended to limit the invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the invention should be included in the scope of the invention.
Claims (6)
1. The utility model provides a subway owner substation power supply system which characterized in that: the bus-coupled circuit comprises a first incoming line circuit, a first section of bus, a second incoming line circuit, a second section of bus, a bus-coupled circuit breaker and a synchronization detection device;
the first incoming line circuit is connected with the first section of bus and used for supplying power to the first section of bus;
the second incoming line circuit is connected with the second section of bus and used for supplying power to the second section of bus;
the input end of the synchronization detection device is used for receiving voltage parameters of the first incoming line circuit side and the second incoming line circuit side;
the output end of the synchronization detection device is connected with the protection device of the bus coupler circuit breaker, and the synchronization detection device judges whether the first incoming line circuit and the second incoming line circuit have synchronization according to the acquired voltage parameters and sends a judgment signal to the protection device of the bus coupler circuit breaker;
the bus coupler circuit breaker is connected between the first section of bus and the second section of bus and used for carrying out loop closing operation when one incoming line has power failure.
2. A power supply system of a main substation power supply of a subway according to claim 1, characterized in that: the first incoming line circuit comprises a first transformer, a first voltage transformer and a first breaker, wherein the output end of the first transformer is connected with the input end of the first breaker, the first voltage transformer is connected between the first transformer and the first breaker in parallel, the output end of the first breaker is connected with a first section of bus, the secondary output end of the first voltage transformer is connected with the input end of the inspection synchronization device, and the first voltage transformer is used for collecting voltage parameters of the line side of the first incoming line circuit.
3. A power supply system of a main substation power supply of a subway according to claim 1, characterized in that: the second inlet wire circuit comprises a second transformer, a second voltage transformer and a second circuit breaker, wherein the output end of the second transformer is connected with the input end of the second circuit breaker, the second voltage transformer is connected between the second transformer and the second circuit breaker in parallel, the output end of the second circuit breaker is connected with a second section of bus, the secondary output end of the second voltage transformer is connected with the input end of the inspection synchronization device, and the second voltage transformer is used for collecting voltage parameters of the line side of the second inlet wire circuit.
4. A closed loop control method of a power supply system of a subway main substation according to any one of claims 1 to 3, characterized by comprising:
step S1, collecting voltage parameters of the first incoming line circuit line side through a first voltage transformer, and collecting voltage parameters of the second incoming line circuit line side through a second voltage transformer;
step S2, performing synchronization parameter detection on the two incoming line circuits according to the acquired voltage parameters through a synchronization detection device, and judging whether the two incoming lines meet a loop closing condition;
and step S3, if the loop closing condition is met, operating the circuit breakers of the two incoming lines according to loop closing control logic, then placing the bus coupler circuit breaker in a closing position to connect the two buses, then placing the first circuit breaker of the first incoming line circuit needing power failure in a separating position, and keeping the second circuit breaker of the second incoming line circuit in the closing position to finish the loop closing operation.
5. The method for controlling the loop closing of the power supply system of the main subway substation according to claim 4, wherein in step S2, the synchronization detection is performed on the two incoming lines according to the voltage parameter by the synchronization detection device, and whether the two incoming lines meet the loop closing condition is judged, comprising the following steps:
step S21, the first voltage transformer sends the collected voltage parameters of the first incoming line circuit line side to a synchronization device;
step S22, the second voltage transformer sends the collected voltage parameters of the second incoming line circuit side to a synchronization device;
and step S23, the synchronization detection device sets the parameter constant values of the amplitude and the phase sequence, judges whether each voltage parameter of the two incoming lines meets the constant value or not, and outputs the result of synchronization judgment to the protection device of the bus-coupled circuit breaker, wherein the result of synchronization judgment comprises the condition of meeting or not meeting the condition of closing.
6. The method for controlling the loop closing of the power supply system of the main subway substation according to claim 5, wherein said step S3 is performed on the two-incoming-line circuit breaker according to the loop closing control logic, and comprises the following steps:
step S31, when power failure operation needs to be carried out on the first incoming line circuit, the first breaker receives a brake-off operation command;
step S32, the protection device of the first circuit breaker sends a switching-off command to the protection device of the bus-coupled circuit breaker, and after receiving the switching-off command, the protection device of the bus-coupled circuit breaker judges a synchronism judgment result output by the synchronism detection device and judges whether a closed loop operation condition is met;
and step S33, when the synchronism judgment result is that the closing is met, meeting a closing ring condition, executing closing operation by the bus-coupled circuit breaker, sending a closing signal to a protection device of a first circuit breaker, and controlling the first circuit breaker to execute a switching-off command.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110973921.6A CN113691009A (en) | 2021-08-24 | 2021-08-24 | Power supply system of subway main substation power supply and closed loop control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110973921.6A CN113691009A (en) | 2021-08-24 | 2021-08-24 | Power supply system of subway main substation power supply and closed loop control method |
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| CN113691009A true CN113691009A (en) | 2021-11-23 |
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| CN202110973921.6A Pending CN113691009A (en) | 2021-08-24 | 2021-08-24 | Power supply system of subway main substation power supply and closed loop control method |
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| CN101227091A (en) * | 2007-11-26 | 2008-07-23 | 江苏省电力公司苏州供电公司 | Intelligent power utilization system |
| CN208589808U (en) * | 2018-06-20 | 2019-03-08 | 中铁第四勘察设计院集团有限公司 | A kind of subway low-tension switch cabinet prepared auto restart control system |
| CN110896247A (en) * | 2019-11-11 | 2020-03-20 | 许玉蕊 | Automatic control system of bus coupler switch |
| CN113162040A (en) * | 2021-04-29 | 2021-07-23 | 西安热工研究院有限公司 | System and method for non-pressure nuclear phase of high-voltage station power supply of power plant |
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2021
- 2021-08-24 CN CN202110973921.6A patent/CN113691009A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227091A (en) * | 2007-11-26 | 2008-07-23 | 江苏省电力公司苏州供电公司 | Intelligent power utilization system |
| CN208589808U (en) * | 2018-06-20 | 2019-03-08 | 中铁第四勘察设计院集团有限公司 | A kind of subway low-tension switch cabinet prepared auto restart control system |
| CN110896247A (en) * | 2019-11-11 | 2020-03-20 | 许玉蕊 | Automatic control system of bus coupler switch |
| CN113162040A (en) * | 2021-04-29 | 2021-07-23 | 西安热工研究院有限公司 | System and method for non-pressure nuclear phase of high-voltage station power supply of power plant |
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