CN115360811A - Power distribution system station service switching method and device - Google Patents
Power distribution system station service switching method and device Download PDFInfo
- Publication number
- CN115360811A CN115360811A CN202210914759.5A CN202210914759A CN115360811A CN 115360811 A CN115360811 A CN 115360811A CN 202210914759 A CN202210914759 A CN 202210914759A CN 115360811 A CN115360811 A CN 115360811A
- Authority
- CN
- China
- Prior art keywords
- switching
- interface
- incoming line
- switch
- standby
- 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.)
- Pending
Links
Images
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
- 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
-
- 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
- H02J3/381—Dispersed generators
-
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- 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
- H02J9/08—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 requiring starting of a prime-mover
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a method and a device for switching station service power of a power distribution system, and relates to the technical field of power distribution systems. By redesigning the auxiliary power switching circuit to perform parallel switching and series switching, the bus normal switching and accident/abnormal switching of the three complete power supplies (working power supply, standby power supply and emergency power supply) are realized, and the grid-connected function of voltage regulation and frequency modulation of the emergency power supply is realized. The function of switching between two working power supplies, a standby power supply and an emergency power supply can be realized, and the flexibility and the safety of the station service of the power distribution system are improved.
Description
Technical Field
The invention relates to the technical field of power distribution systems, in particular to a method and a device for switching station service power of a power distribution system.
Background
The auxiliary power quick switching device is widely applied to an auxiliary power system of a power station at present, and has a great influence on safe and stable operation of the power station and even the whole power system. For a nuclear power plant, the safety of the whole station service system directly influences the safe operation of a nuclear power unit, and if the station service system recovers as fast as possible after power failure, the self-starting of a motor is facilitated, and the influence of the system power failure on the operation of the unit is reduced.
At present, the typical domestic auxiliary power quick switching device, such as MFC2000-6 type and SID-40A type, is provided with the functions of carrying out normal switching (mainly in parallel mode) and accident/abnormal switching (in series or simultaneous mode, realized in the modes of quick, synchronous capture, residual voltage and the like) on a bus with a double-circuit power supply (working power supply and standby power supply).
The AP series nuclear power unit is provided with a normal switching mode (mainly a parallel mode) and an accident/abnormal switching mode (a series or simultaneous mode, realized in a quick or residual voltage mode and other modes) for a bus with a double-circuit power supply (a working power supply and a standby power supply) through a medium-voltage integrated protection SEL-351 type, and does not have a synchronous capturing function.
CAP series nuclear power generating units pass through a fast switching screen SEL451 type at present, and have the function of carrying out accident/abnormal switching (series connection or simultaneous mode, realized in modes of fast, synchronous capture, residual voltage and the like) on a bus with a double-circuit power supply (a working power supply and a standby power supply). Through the master control synchronization screen SEL700G, the bus with the double-circuit power supply (working power supply and standby power supply) is normally switched (the parallel mode is main), and the diesel power generation source (emergency power supply) is switched into a grid in an isolated island mode.
The inventor finds that the prior similar device mainly has the following problems:
1. the existing fast switching device can only meet the switching of a double-circuit power supply.
2. The diesel power generation source (emergency power supply) island is converted into a grid, and the grid is connected by depending on other independent screen cabinets/devices, and the defects of high operation complexity of a bus power supply, long switching time of the bus power supply, multiple voltage and signal loops and the like exist in the cooperative work of multiple devices.
3. The existing equipment does not have the forward parallel switching function (the working power supply or the standby power supply is switched to the emergency power supply in parallel) of a diesel power generation source (emergency power supply).
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a device for switching station service of a power distribution system, which have the advantages that the bus normal switching and the accident/abnormal switching of three paths of power supplies (a working power supply, a standby power supply and an emergency power supply) are completed by redesigning a station service switching circuit, the function of switching two working power supplies, the standby power supply and the emergency power supply mutually can be realized under the condition of not influencing the normal loading of a power distribution bus, and the device has the grid-connected function of regulating the voltage and the frequency of the emergency power supply. The flexibility and the security of the service power of the power distribution system are improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the first aspect of the disclosure provides a method for switching station service of a power distribution system, which includes parallel switching and series switching, wherein the parallel switching includes a working incoming line switch tangential emergency incoming line switch, and the specific steps are as follows:
when the bus is in a working incoming line loading state, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode (the diesel generator is started);
after the outlet voltage of the diesel generator reaches the rated voltage, automatic synchronous adjustment is carried out, and after synchronous conditions are met, difference frequency grid connection (closing an emergency incoming switch) is carried out;
and after the grid connection is successful, the output power of the diesel generator is improved, and after the working inlet current is smaller than the limit value, the working inlet switch is tripped.
Further, the parallel switch further comprises a standby incoming line switch tangential emergency incoming line switch, and the specific steps are as follows:
when the bus is in standby incoming line loading, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode;
performing synchronous adjustment after the outlet voltage of the diesel generator reaches the rated voltage, and performing difference frequency grid connection after synchronous conditions are met;
after the grid connection is successful, the output power of the diesel generator is increased, and the standby incoming line switch is tripped off after the standby incoming line current is smaller than a limit value.
Further, parallelly connected switching still includes emergent inlet wire switch tangential work inlet wire switch, and concrete step is:
when the bus is in a diesel engine inlet wire island loaded state, after receiving a tangential work inlet wire switch command, performing synchronous adjustment;
after the synchronous conditions are met, carrying out grid connection (closing a working inlet switch);
and after the grid connection is successful, tripping off the emergency incoming line switch after setting delay.
Further, parallelly connected switching still includes the reserve inlet wire switch of emergent inlet wire switch tangential, and concrete step is:
when the bus is in a diesel engine inlet wire island loaded state, after receiving a tangential standby inlet wire switch command, performing synchronous adjustment;
after the synchronous conditions are met, carrying out grid connection (closing a standby incoming switch);
and after the grid connection is successful, tripping the emergency incoming line switch after setting delay.
Further, the synchronization adjustment comprises voltage regulation and frequency modulation.
Furthermore, after the parallel switching is started, the series switching is locked until the parallel switching is finished, and then the locking is released.
Further, the method also comprises series switching, wherein the series switching comprises quick switching, synchronous capturing and residual voltage switching.
Furthermore, after the residual voltage switching fails, a series switching mode of automatically closing the emergency incoming line switch is added.
The second aspect of the present disclosure provides a power switching apparatus for a power distribution system, including:
the device comprises a switching value input interface, an analog value input interface, a switching value output interface, a speed and voltage regulating output interface and a communication interface.
Further, the switching value input interface comprises a working inlet wire branching interface, a standby inlet wire branching interface, a firewood sending inlet wire branching interface and the like;
the speed-regulating and voltage-regulating output interface comprises a speed-increasing interface, a speed-reducing interface, a pressure-increasing interface and a pressure-reducing interface;
the analog input interface comprises a bus voltage interface, a working incoming line voltage interface, a standby incoming line voltage interface, an emergency incoming line voltage interface, a working incoming line current interface and a standby incoming line current interface.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
compared with the traditional equipment which can only meet the switching of a two-way power supply, the auxiliary power switching circuit is redesigned by adding the emergency power supply branch, so that the control functions of normal switching and accident/abnormal switching of the auxiliary power distribution bus of the complete three-way power supply (working power supply, standby power supply and emergency power supply) are realized.
According to the invention, through the interface arrangement of the switching device, a plurality of voltage, current and signal loops are integrated and input into one set of device, so that the defect that the existing equipment needs a plurality of devices and requires a plurality of voltage, current and signal loops is avoided; the device integrates the automatic control function of the three power supplies, avoids the need of multi-equipment operation during switching operation of the existing equipment, and reduces the operation complexity.
The bus emergency power supply control system is added with a control function of the bus emergency power supply, and can realize the functions of voltage regulation, frequency modulation, grid connection and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a single line diagram of a service power distribution bus according to a first embodiment of the present invention;
fig. 2 is a schematic interface diagram of a station service power switching apparatus according to a second embodiment of the present invention;
fig. 3 is a flow chart of switching of the working incoming line switch and the standby incoming line switch to the tangential emergency incoming line switch in the first embodiment of the present invention.
Fig. 4 is a flow chart of switching between the emergency incoming line switch and the standby incoming line switch in the tangential direction according to the embodiment of the present invention.
The specific implementation mode is as follows:
it should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Description of terms:
a working incoming line switch: the switch provides normal AC power for the distribution bus, and the power is obtained from a station transformer.
Standby incoming line switch: a switch for providing backup AC power to a distribution bus, typically from a backup transformer.
Emergent inlet wire switch: the emergency diesel generator is connected with the power distribution bus through a switch.
Parallel switching (normal switching): taking the case that the bus supplies power through the working incoming line switch as an example, the standby incoming line switch is closed through the switching device, and then the working incoming line switch is automatically tripped through the set time delay, and the process is parallel switching. The process of parallel switching is reversible. The device can execute parallel switching between any two of a working incoming line switch, a standby incoming line switch and an emergency incoming line switch. The switching process does not affect the continuous power supply of the bus to the downstream load.
Series switching: the switching mode of firstly tripping off the working incoming line switch and then closing the standby incoming line switch. Typical series switching includes implementations of fast switching, contemporaneous capture, and residual voltage switching. Typically triggered by an upstream equipment fault signal (such as a transformer fault)/or a breaker trip signal.
And (3) fast switching: and switching on the standby incoming line switch before the first phase reversal of the bus residual voltage and the standby power supply voltage. The mode switching time is short, and the impact on the bus is small.
Synchronously capturing and switching: and after the bus is failed to be quickly switched, capturing a same-phase point before the phase of the bus residual voltage and the standby power supply voltage is reversed for the second time, and performing closing operation. This mode is slightly longer than the fast switching time.
Residual voltage switching: after the synchronous capture switching fails, when the residual voltage of the bus is lower than a set value, the standby power supply is closed, and the method is a switching mode with long delay and is usually set for 10 seconds.
Accident/abnormal switching: power switching triggered by abnormal conditions such as upstream equipment failure (e.g., transformer failure)/or circuit breaker tripping.
And (3) synchronous adjustment: the amplitude, the phase and the frequency of the voltage of the diesel generator are adjusted, so that the difference value between the amplitude, the phase and the frequency of the voltage of the diesel generator and the voltage of another power supply is smaller than a synchronous setting value, namely, a synchronous condition is met.
The first embodiment is as follows:
the embodiment of the disclosure provides a method for switching station service of a power distribution system, which includes parallel switching and series switching, wherein the parallel switching can be performed by a working incoming line switch or a standby power switch to an emergency incoming line switch (i.e. a diesel generator) to perform grid-connected switching, and the switching process is bidirectional, and specifically includes:
1. emergent service incoming line switch of work service incoming line switch tangential, as shown in fig. 3:
stage one: when the bus is in a working incoming line with load, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode (the diesel generator is started).
And a second stage: rated voltage is required to be gradually established in the starting process of the diesel generator, synchronous adjustment (voltage regulation and frequency modulation) is carried out by the switching device after the rated voltage is reached, and difference frequency grid connection (emergency inlet switch closing) is carried out after synchronous conditions are met. The process sets the open time, locks when the time is out, and stops the switching process.
And a third stage: and after the grid connection is successful, the output power of the diesel generator is improved, and after the working inlet current is smaller than the limit value, the working inlet switch is tripped. The process sets the open time, locks when the time is out, and stops the switching process.
2. The emergency service entrance switch of reserve service entrance switch tangential, as shown in fig. 3:
stage one: when the bus is in standby incoming line loading, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode (the diesel generator is started).
And a second stage: after the rated voltage is reached, synchronous adjustment (voltage regulation and frequency modulation) is carried out by the switching device, and after synchronous conditions are met, difference frequency grid connection (closing an emergency incoming line switch) is carried out. The process sets the open time, locks when the time is out, and stops the switching process.
And a third stage: and after the grid connection is successful, the output power of the diesel generator is increased, and after the standby inlet wire current is smaller than the limit value, the standby inlet wire switch is tripped off. The process sets the open time, locks when the time is out, and stops the switching process.
3. Emergent inlet wire switch tangential work inlet wire switch, as shown in fig. 4:
stage one: when the bus is in a diesel engine inlet wire island loaded state, after receiving a tangential work inlet wire switch command, the switching device performs synchronous adjustment (voltage regulation and frequency regulation), and after meeting synchronous conditions, the bus is connected to the power grid (the work inlet wire switch is closed). The process sets the open time, locks when the time is out, and stops the switching process.
And a second stage: and after the grid connection is successful, tripping off the emergency incoming line switch after setting delay. The process sets the open time, locks when the time is out, and stops the switching process.
4. Emergency incoming line switch tangential standby incoming line switch, as shown in fig. 4:
stage one: when the bus is in a diesel engine inlet wire island loaded state, after receiving a tangential standby inlet wire switch command, the switching device performs synchronous adjustment (voltage regulation and frequency regulation), and after meeting synchronous conditions, the bus is connected to the power grid (the standby inlet wire switch is closed). The process sets the open time, locks when the time is out, and stops the switching process.
And a second stage: and after the grid connection is successful, tripping the emergency incoming line switch after setting delay. The process sets the open time, locks when the time is out, and stops the switching process.
5. Series switching increases emergent inlet wire switch function
The series switching comprises sequential implementation modes of fast switching, synchronous capturing and residual voltage switching. When the bus-in line switching system normally operates, the service bus is supplied with power by the working incoming line, when the working incoming line side breaks down, the switching start logic is triggered by jumping the working incoming line switch at the same time, and then the logic enters the quick switching judgment logic. If the fast switching, the synchronous capture and the residual voltage switching fail in sequence, additional closed 'emergency incoming line switch' logic is executed. (Diesel engine generator starting triggered by 'switching start')
Preferably, after the parallel switching is started, the series switching is locked, and the locking is released until the parallel switching is finished.
Preferably, the distribution bus, the working incoming line, the standby incoming line, the emergency incoming line, and the plurality of feeder switches are connected as shown in fig. 1, and the distribution bus is generally a distribution bus with voltage levels of 10kV, 400V, and the like. The bus is provided with three incoming switches (working, standby, emergency incoming switches, respectively, for power input) and several feeder switches (for power output). The working incoming line switch power supply is taken from a power supply 1 (such as a service transformer or the like, and the voltage amplitude and the frequency of the power supply are generally not adjustable); the standby incoming line switch is taken from a power supply 2 (such as a standby transformer or other, the voltage amplitude and frequency of the power supply are generally not adjustable); the emergency incoming line switch power supply is taken from an emergency diesel generator in a factory (the voltage amplitude and the frequency of the power supply can be adjusted);
example two:
an embodiment of the present disclosure provides a switching device for a power station of a power distribution system, as shown in fig. 2, including:
the device comprises a switching value input interface, an analog value input interface, a switching value output interface, a speed and voltage regulating output interface and a communication interface.
The switching value input interface can realize the access of a working incoming line, a standby incoming line, a firewood sending incoming line and the like. The functions of bus switching, accident switching starting, abnormal bus switching, accident switching locking, non-division of circuit breakers of motor type loads (more than or equal to 1 circuit breaker for supplying power to the motor type loads in all feeder circuit breakers is not switched off, and the functions are usually used for residual voltage switching or load emptying confirmation before loading of a diesel generator), parallel switching starting, a tangential working inlet switch, a tangential standby inlet switch, a tangential emergency inlet switch and the like can also be realized.
The functions of closing working incoming lines, jumping working incoming lines, closing standby incoming lines, jumping standby incoming lines, closing emergency incoming lines, jumping emergency incoming lines and the like can be output through the switching value output interface. And the system can also output allowable bus accident switching feedback, residual voltage switching starting feedback, device abnormity feedback, starting firewood sending and the like.
The speed-regulating and voltage-regulating output interface comprises a speed-increasing interface, a speed-reducing interface, a pressure-increasing interface and a pressure-reducing interface.
The analog input interface comprises a bus voltage working incoming line voltage interface, a standby incoming line voltage interface, an emergency incoming line voltage interface, a working incoming line current interface, a standby incoming line current interface and the like.
The analog input interface is used for acquiring secondary voltage values of the bus and each power supply and is used for synchronously judging different power supplies before switching the power supplies; and collecting the secondary current of the working or standby incoming line, and judging the current when the working or standby incoming line switch is switched in parallel and the emergency incoming line switch is tangential.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for switching station power of a power distribution system is characterized by comprising the following steps: the parallel switch comprises a working incoming line switch tangential emergency incoming line switch, and the method comprises the following specific steps:
when the bus is in a working incoming line loading state, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode;
carrying out synchronous adjustment after the rated voltage is reached, and carrying out difference frequency grid connection after synchronous conditions are met;
and after the grid connection is successful, the output power of the diesel generator is improved, and after the working inlet current is smaller than the limit value, the working inlet switch is tripped.
2. The method for switching station power of distribution system as claimed in claim 1, wherein said parallel switching further comprises a standby incoming line switch tangential emergency incoming line switch, the specific steps being:
when the bus is in standby incoming line loading, after receiving a tangential emergency incoming line switch command, the diesel generator receives a signal and automatically places the signal in a standby mode;
carrying out synchronous adjustment after the rated voltage is reached, and carrying out difference frequency grid connection after synchronous conditions are met;
and after the grid connection is successful, the output power of the diesel generator is increased, and after the standby inlet wire current is smaller than the limit value, the standby inlet wire switch is tripped off.
3. The method for switching station power of distribution system as claimed in claim 1, wherein said parallel switching further comprises an emergency incoming switch tangential working incoming switch, the specific steps are:
when the bus is in a diesel engine inlet wire island loaded state, after receiving a tangential work inlet wire switch command, performing synchronous adjustment;
after meeting the synchronization condition, carrying out grid connection;
and after the grid connection is successful, tripping the emergency incoming line switch after setting delay.
4. The method for switching the service power of the power distribution system according to claim 1, wherein the parallel switching further comprises an emergency incoming switch tangential standby incoming switch, and the specific steps are as follows:
when the bus is in a diesel engine inlet wire island load state, after receiving a tangential standby inlet wire switch command, performing synchronous adjustment;
after meeting the synchronization condition, carrying out grid connection;
and after the grid connection is successful, tripping off the emergency incoming line switch after setting delay.
5. The method of claim 1, wherein said contemporaneous adjustment comprises voltage and frequency modulation operations.
6. The method of claim 1, further comprising a series switching, the series switching comprising a fast switching, a synchronous capture, and a residual voltage switching.
7. The method according to claim 6, wherein a series switching mode for automatically closing the emergency service line switch is added after the residual voltage switching fails.
8. The method of claim 6, wherein the parallel switching is initiated and the series switching is blocked until the parallel switching is terminated and the blocking is released.
9. A power switching apparatus for a power distribution system, comprising:
the device comprises a switching value input interface, an analog value input interface, a switching value output interface, a speed and voltage regulating output interface and a communication interface.
10. The electrical distribution system utility switching apparatus of claim 9, wherein the switching value input interface comprises a service inlet interface, a standby inlet interface, and a diesel engine inlet interface;
the speed-regulating and voltage-regulating output interface comprises a speed-increasing interface, a speed-reducing interface, a pressure-increasing interface and a pressure-reducing interface;
the analog input interface comprises a bus voltage interface, a working incoming line voltage interface, a standby incoming line voltage interface, an emergency incoming line voltage interface, a working incoming line current interface and a standby incoming line current interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210914759.5A CN115360811A (en) | 2022-08-01 | 2022-08-01 | Power distribution system station service switching method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210914759.5A CN115360811A (en) | 2022-08-01 | 2022-08-01 | Power distribution system station service switching method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115360811A true CN115360811A (en) | 2022-11-18 |
Family
ID=84031014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210914759.5A Pending CN115360811A (en) | 2022-08-01 | 2022-08-01 | Power distribution system station service switching method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115360811A (en) |
-
2022
- 2022-08-01 CN CN202210914759.5A patent/CN115360811A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109066785B (en) | Micro-grid real-time control method and micro-grid | |
| CN101436787B (en) | Method for automatically devoting microcomputer control standby power for enlarging inner bridge wire splice | |
| CN111463756B (en) | Protection locking joint optimization method based on high-service bus protection and fast switching device | |
| CN107947340B (en) | Power supply fast switching system and switching method thereof | |
| CN111835031A (en) | Wind generating set converter network side circuit breaker and machine side switch control strategy | |
| KR101085175B1 (en) | An emergency diesel generator digital excitation system for nuclear power plant using digital triplication controller and duplication rectifier, method for changing operating mode thereof and method for rapidly starting thereof | |
| CN107612021A (en) | A kind of region prepared auto restart control method suitable for a large amount of small power supplies access local power network | |
| CN110460047B (en) | Power supply switching method and system for ballast alternating current system in nuclear power ship | |
| CN103280880B (en) | Decoupling control method for controlling backup power supply automatic switching by expansion inner bridge microcomputer | |
| CN112952809B (en) | Series loop-closing power regulating device and method for multi-loop network cabinet of power distribution network | |
| US3543045A (en) | Method and apparatus for connecting and disconnecting converter station between transmission lines | |
| CN115360811A (en) | Power distribution system station service switching method and device | |
| CN108494085B (en) | Voltage regulating system and method based on high-power-plant variable on-load transformer | |
| RU2692758C1 (en) | Method of power supply control for industrial power district with sources of distributed generation at short-circuit on reserved section of substation buses | |
| KR102105812B1 (en) | Apparatus for replacing transformer with uninterruptiable power supply and method | |
| US11362519B2 (en) | Apparatus and methods for soft grid interconnection of distributed generation assets | |
| CN103219793A (en) | Decoupling control method of multifunctional microprocessor control backup power automatic switch | |
| CN103219794B (en) | Decoupling control method of multifunctional microprocessor control backup power automatic switch | |
| CN103280881A (en) | Decoupling control method for controlling automatic switching of backup power supply by expansion inner bridge connection wire microcomputer | |
| Xing et al. | Analysis on the Control Strategy and Response Characteristics of Large Capacity STATCOM Device in DC Converter Station | |
| CN216086256U (en) | Automatic power switching system | |
| RU2343617C1 (en) | Method for combined inhibit of automatic switchover for permanent faults and voltage falls | |
| JPH10213696A (en) | Station power facility of reactor power plant | |
| JP2745838B2 (en) | Power generation system | |
| JP3212701B2 (en) | Static variable voltage variable frequency power supply and power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
|
| CB02 | Change of applicant information |