CN214380293U - Generating set for supplying power to main pump of nuclear power plant - Google Patents
Generating set for supplying power to main pump of nuclear power plant Download PDFInfo
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- CN214380293U CN214380293U CN202120418418.XU CN202120418418U CN214380293U CN 214380293 U CN214380293 U CN 214380293U CN 202120418418 U CN202120418418 U CN 202120418418U CN 214380293 U CN214380293 U CN 214380293U
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- 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
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- 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
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Abstract
The utility model relates to a generating set for nuclear power plant's main pump power supply belongs to nuclear power unit power supply unit technical field. The main pump is provided with two sets of power supply systems which are connected in parallel and comprise a frequency converter power supply system and an electric generator set power supply system; the power supply system of the electric generating set comprises a set inlet switch, a motor, a gear set, a generator and a set outlet switch from an upstream bus to a main pump in sequence; the problem of inconsistent rotating speeds required by the motor and the generator is solved by arranging a gear set between the motor and the generator; during power operation, the motor generator set supplies power to the main pump, so that the reliability of power supply can be improved; the motor generator set and the main pump frequency converter are mutually standby during power operation, redundancy is increased, and the reliability of the whole system is further improved. Through the utility model discloses an use actual conditions such as can also developing ability, cost according to the manufacturer, select synchronous generator, the motor of most economic in order to reduce the running cost.
Description
Technical Field
The utility model relates to a generating set for nuclear power plant's main pump power supply belongs to nuclear power unit power supply unit technical field.
Background
The AP1000/CAP1000 nuclear power unit reactor coolant system (RCS system for short) has four main pumps, and the RCS system converts heat energy generated in a reactor core into high-temperature saturated steam and transmits the high-temperature saturated steam to a steam turbine generator unit to be converted into electric energy; the RCS system has safety-related functions of guiding out sensible heat in the system after shutdown and decay heat of a reactor core and the like. The main pump is used as the core equipment of the RCS system, and safe and stable operation is very important.
A main pump motor of the AP1000/CAP1000 nuclear power unit adopts a shielded motor, the rated voltage is 6.9kV, and the rated frequency is 60 Hz. The main pump motor is driven and controlled by a frequency converter, and a 10.5kV and 50Hz station power supply needs to be converted into a 6.9kV and 60Hz power supply through the frequency converter for the main pump motor to use. Because the main pump is not allowed to be directly started, a frequency conversion starting mode is required to be adopted, the frequency converter is used in the Chinese AP1000/CAP1000 nuclear power unit during starting, and the frequency converter is still required to continuously operate after starting is finished, so that power is continuously supplied to the main pump. The main pump is very important in the nuclear power unit, so that the main pump and the power supply equipment are required to have high reliability, and the frequency converter is adopted for continuous power supply, so that the equipment is high in use cost, a complex power supply intermediate link is added, and the reliability of power supply is reduced. Therefore, the current power supply mode by adopting the frequency converter has the following technical problems: 1. the main pump frequency converter has low operation reliability, frequent faults such as pre-charging failure, control system switching, power unit bypass and the like occur, and unplanned shutdown of the unit can be caused; 2. the failure of a main pump frequency converter causes the shutdown of a unit, which causes great economic loss to a nuclear power plant; 3. unplanned shutdown affects the operation performance of a nuclear power unit and causes serious negative impact on the image of a nuclear power enterprise. In the prior art, a solution is also provided for solving the above technical problems, for example, a chinese patent "a power supply method for an electric generator set of an AP1000 nuclear power unit reactor coolant pump" (application number: CN 202010735659.7) provides a power supply method for an electric generator set of an AP1000/CAP1000 nuclear power unit reactor coolant pump, and the technical scheme is provided with two sets of power supply systems from an upstream bus to a main pump, including a frequency converter power supply system and an electric generator set power supply system; the frequency converter power supply system sequentially comprises a main pump loop switch, a main pump frequency converter, a reactor and a frequency converter outlet switch from an upstream bus to a main pump; the power supply system of the electric generating set comprises a set inlet switch, the electric generating set and a set outlet switch from an upstream bus to a main pump in sequence; the motor generator set comprises 1 synchronous motor with 5 antipodes, 1 synchronous generator with 6 antipodes, and a motor excitation cabinet, a generator excitation cabinet, a set control cabinet and a set protection cabinet which are matched with the synchronous generator. Since the motor speed =60 × frequency/pole pair number, when the pole pair number takes 1, 2, 3, 4, 5, 6, the 50Hz and 60Hz motor speeds are 3000rpm and 3600rpm, 1500rpm and 1800rpm, 1000rpm and 1200rpm, 750rpm and 900rpm, 600rpm and 720rpm, 500rpm and 600rpm, respectively. In the prior art, in the Chinese patent 'a power supply method for an electric generating set of an AP1000 nuclear power generating set reactor coolant pump' to achieve the purpose that the rotating speeds of a motor and a generator are consistent, 50Hz is input and 60Hz is output, the number of pole pairs of the motor and the generator can only be respectively 5 and 6, and the rotating speeds of the motor and the generator are both 600 rpm. However, the motor and the generator of the scheme have too many pole pairs, and are large in size, low in efficiency, high in cost, difficult to manufacture and difficult to realize.
Disclosure of Invention
The utility model aims at solving the technical problem that the motor and the generator of adoption have too many number of pole pairs, large volume, low efficiency, high cost, difficult manufacture and difficult realization in order to reach the motor and the generator rotational speed unanimously among the prior art.
In order to solve the problems, the technical scheme adopted by the utility model is to provide a generator set for supplying power to a main pump of a nuclear power plant; the main pump is provided with two sets of power supply systems which are connected in parallel and comprise a frequency converter power supply system and an electric generator set power supply system; the frequency converter power supply system sequentially comprises a main pump loop switch, a main pump frequency converter and a frequency converter outgoing switch from an upstream bus to a main pump; the power supply system of the electric generating set comprises a set inlet switch, the electric generating set and a set outlet switch from an upstream bus to a main pump in sequence; the motor generator set comprises a motor, a gear set and a generator which are connected in sequence.
Preferably, the unit incoming line switch is connected with the motor; the generator is connected with the unit outlet switch.
Preferably, the electric motor is provided as a synchronous motor.
Preferably, the generator is provided as a synchronous generator.
Preferably, the gear ratios of the gear sets are arranged in accordance with the number of pole pairs of the motors and generators.
Preferably, the electric motor is provided with an excitation system for providing excitation to the electric motor.
Preferably, the generator is provided with an excitation system for providing excitation to the generator.
Preferably, the outlet voltage of the generator is set to be 6.9 kV.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a set up a gear train and can solve the inconsistent problem of the required rotational speed of motor and generator between motor and generator. The most economical motor and generator can be selected.
2. The electric generator set has high stability relative to a main pump frequency converter, and the reliability of power supply can be improved by supplying power to the main pump by the electric generator set during power operation; the motor generator set and the main pump frequency converter are mutually standby during power operation, redundancy is increased, and the reliability of the whole system is further improved.
3. Through the utility model discloses an use, can select synchronous generator, the motor of most economic according to actual conditions such as manufacturer development ability, cost.
Drawings
FIG. 1 is a schematic view of the installation structure of the present invention;
reference numerals: 1. a main pump circuit switch; 2. a main pump frequency converter; 3. a frequency converter outgoing switch; 4. a second switch; 5. a third switch; 6. a main pump; 10. a unit incoming line switch; 11. a synchronous motor; 12. a gear set; 13. a synchronous generator; 14. the unit switch of being qualified for next round of competitions.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
the utility model provides a generator set for supplying power to a nuclear power plant main pump, wherein the main pump is provided with two sets of power supply systems connected in parallel, and the power supply systems comprise a frequency converter power supply system and an electric generator set power supply system; the frequency converter power supply system comprises a main pump loop switch 1, a main pump frequency converter 2 and a frequency converter outgoing line switch 3 from an upstream bus to a main pump 6 in sequence; the power supply system of the electric generating set comprises a set inlet switch 10, the electric generating set and a set outlet switch 14 from an upstream bus to the main pump 6 in sequence; the motor generator set comprises a motor, a gear set 12 and a generator which are connected in sequence. The unit inlet wire switch 10 is connected with the motor; the generator is connected with a unit outlet switch 14. The motor is a synchronous motor 11. The generator is set as a synchronous generator 13. The gear ratio of the gear set 12 is set according to the motor and generator pole pair number. The motor is provided with an excitation system for providing excitation to the motor. The generator is provided with an excitation system for providing excitation for the generator. The outlet voltage of the generator is set to 6.9 kV.
The utility model discloses set up a gear train and can easily solve the inconsistent problem of the required rotational speed of motor and generator between motor and generator. If the number of pole pairs of the motor generator is 1, the transmission ratio of the gear set 12 is 6:5, and the rotating speeds of the motor generator are 3000rpm and 3600rpm respectively; if the number of pole pairs of the motor generator is 2, the transmission ratio of the gear set 12 is still 6:5, and the rotating speeds of the motor generator are 1500rpm and 1800rpm respectively; if the number of pole pairs of the motor generator is 1 and 2, respectively, the transmission ratio of the gear set 12 is 3:5, and the rotation speeds of the motor generator are 3000rpm and 1800 rpm; and so on, selecting the most economical motor and generator.
The technical scheme of the utility model provides a power supply method for an electric generating set of a main pump of an AP1000/CAP1000 nuclear power unit, wherein two sets of power supply systems are arranged from an upstream bus to the main pump, and each power supply system comprises a frequency converter power supply system and an electric generating set power supply system; the frequency converter power supply system comprises a main pump loop switch 1, a main pump frequency converter 2 and a frequency converter outgoing line switch 3 from an upstream bus to a main pump 6 in sequence; the power supply system of the electric generating set comprises a set inlet switch 10, a synchronous motor 11, a gear set 12 and a synchronous generator 13 from an upstream bus to a main pump 6 in sequence; the operation steps of the main pump 6 are:
step one, a frequency converter power supply system is communicated, and a main pump 6 is started;
step two, when the main pump 6 stably runs according to the rated rotating speed, the inlet switch 10 of the unit is closed, and the electric generating set is adjusted to reach the rated voltage and the rated frequency of the main pump 6; after the electric generating set stably operates, the frequency and the phase of the outgoing line of the main pump frequency converter 2 are adjusted according to the frequency and the phase of the outgoing line of the electric generating set, and when the frequency and the phase of the outgoing line of the main pump frequency converter 2 are consistent with the frequency and the phase of the outgoing line of the electric generator, the outgoing line switch 14 of the set is closed, and a power supply system of the electric generating set operates in a grid-connected mode;
and step three, after the power supply system of the motor generator set is in grid-connected operation, the outlet switch 3 of the frequency converter is disconnected. The frequency converter power supply system and the motor generator set power supply system can be switched. In the main pump starting stage, the main pump frequency converter 2 is used for controlling and supplying power; the power operation stage is switched to an electric generating set to supply power to a main pump, and an original main pump frequency converter 2 is used as a standby power supply; when the motor generator set fails in operation, the set incoming line switch 10 and the set outgoing line switch 14 are disconnected, the frequency converter outgoing line switch 3 is closed, and the frequency converter outgoing line switch is switched to a frequency converter power supply system for supplying power; and during normal work, the electric generator set can be switched to the main pump frequency converter to supply power.
Examples
As shown in fig. 1; a main pump power supply of a Chinese AP100/CAP1000 nuclear power unit is led from a 10.5kV and 50Hz alternating current bus, and is converted into a 6.9kV and 60Hz power supply through a main pump frequency converter 2 to supply power for a main pump 6. The main pump 6 is started, and is controlled and powered by the main pump frequency converter 2; in the power operation stage, the electric generating set supplies power to the main pump 6, and the original main pump frequency converter 2 serves as a standby power supply.
Firstly, a system structure: the motor generator set gets electricity from a 10.5kV bus, and the motor generator set consists of 1 synchronous motor 11, 1 synchronous generator 13 and a gear set 12. An inlet configuration switch of the motor generator set is used as a unit incoming switch 10, and an outlet configuration switch of the motor generator set is used as a unit outgoing switch 14. The outlet of the original main pump frequency converter 2 needs to be provided with a switch as a frequency converter outgoing switch 3.
The two outgoing line switches 3 and 14 are controlled according to the operation mode of the system.
Secondly, the operation mode is as follows:
1. main pump start
When a main pump 6 is started, a main pump frequency converter 2 is used for controlling and supplying power, a main pump loop switch 1 is closed, a frequency converter outgoing line switch 3 is closed, and a second switch 4 and a third switch 5 in front of the main pump are closed; the unit incoming switch 10 and the unit outgoing switch 14 of the motor generator set are disconnected.
2. Work switching from frequency converter to motor generator set
When the main pump 6 stably runs at the rated rotating speed, the unit inlet switch 10 is closed, and the electric generator set is started, so that the generator reaches the rated voltage and the rated frequency of the main pump. After the unit operates stably, the main pump frequency converter 2 detects the frequency and the phase of the outgoing line of the electric generating set and carries out self-regulation. When the frequency and the phase of the outgoing line of the main pump frequency converter are consistent with the frequency and the phase of the outgoing line of the electric generator set, the outgoing line switch 14 of the electric generator set is closed, so that the electric generator runs in a grid-connected mode. The outlet switch 3 of the frequency converter is switched off, and the frequency converter 2 of the main pump stops outputting. The main pump frequency converter 2 is switched to a standby state from on-load operation, and the electric generating set independently supplies power to the main pump 6.
3. Fault switching from electric generator set to main pump frequency converter
And in the on-load operation stage of the electric generating set, the main pump frequency converter 2 is in a standby state. When the unit is in fault, the unit incoming line switch 10 and the unit outgoing line switch 14 are disconnected, so that the motor-generator unit is withdrawn from the system to operate. In the idling stage of the main pump, the main pump loop switch 1 is closed, the main pump frequency converter 2 detects the voltage, the rotating speed and the magnetic flux of the main pump 6, adjusts the voltage, the frequency and the phase of the output end, and then the main pump frequency converter 2 is rapidly converted from the standby state to the output state. The main pump is independently powered by the main pump frequency converter 2.
Thirdly, a scheme of the motor generator set is as follows:
because the output frequency of the motor-generator set is 60Hz and different pole pair numbers are selected, the rotating speed of the generator shaft can only be 3600rpm, 1800rpm, 1200rpm, 900rpm, 720rpm and 600rpm …; because the input frequency of the motor-generator set is 50Hz, different pole pair numbers are selected, and the rotating speed of the motor shaft can only be 3000rpm, 1500rpm, 1000rpm, 750rpm, 600rpm and 50rpm ….
The problem of inconsistent rotation speeds required by the motor and the generator can be solved by arranging a gear set between the motor and the generator. If the number of pole pairs of the motor generator is 1, the transmission ratio of the gear set is 6:5, and the rotating speeds of the motor generator are 3000rpm and 3600rpm respectively; if the number of pole pairs of the motor generator is 2, the transmission ratio of the gear set is still 6:5, and the rotating speeds of the motor generator are 1500rpm and 1800rpm respectively; if the pole pair number of the motor generator is 1 and 2 respectively, the transmission ratio of the gear set is 3:5, and the rotating speeds of the motor generator are 3000rpm and 1800rpm respectively; and by analogy, the most economical motor and generator can be selected.
The motor excitation system provides excitation for the motor, and the generator excitation system provides excitation for the generator, so that the outlet voltage of the generator is maintained at 6.9 kV. The electric generator set of the utility model has high stability relative to the main pump frequency converter, and the reliability of power supply can be improved by supplying power to the main pump by the electric generator set during the power operation period; the motor generator set and the main pump frequency converter are mutually standby during power operation, redundancy is increased, and the reliability of the whole system is further improved. Through the utility model discloses an use actual conditions such as can also developing ability, cost according to the manufacturer, select synchronous generator, the motor of most economic in order to reduce the running cost.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (8)
1. A generator set for supplying power to a main pump of a nuclear power plant is provided, wherein the main pump is provided with two sets of power supply systems which are connected in parallel, and each power supply system comprises a frequency converter power supply system and an electric generator set power supply system; the frequency converter power supply system sequentially comprises a main pump loop switch, a main pump frequency converter and a frequency converter outgoing switch from an upstream bus to a main pump; the power supply system of the electric generating set comprises a set inlet switch, the electric generating set and a set outlet switch from an upstream bus to a main pump in sequence; the method is characterized in that: the motor generator set comprises a motor, a gear set and a generator which are connected in sequence.
2. The generator set of claim 1, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the unit incoming line switch is connected with the motor; the generator is connected with the unit outlet switch.
3. The generator set of claim 2, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the motor is a synchronous motor.
4. A generator set for powering a main pump of a nuclear power plant according to claim 3, characterized in that: the generator is set as a synchronous generator.
5. The generator set of claim 4, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the gear ratio of the gear set is set according to the pole pair number of the motor and the generator.
6. The generator set of claim 5, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the motor is provided with an excitation system for providing excitation for the motor.
7. The generator set of claim 6, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the generator is provided with an excitation system for providing excitation for the generator.
8. The generator set of claim 7, wherein the generator set is configured to power a main pump of a nuclear power plant, and further comprising: the outgoing line voltage of the generator is set to be 6.9 kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120418418.XU CN214380293U (en) | 2021-02-25 | 2021-02-25 | Generating set for supplying power to main pump of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120418418.XU CN214380293U (en) | 2021-02-25 | 2021-02-25 | Generating set for supplying power to main pump of nuclear power plant |
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| Publication Number | Publication Date |
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| CN214380293U true CN214380293U (en) | 2021-10-08 |
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| CN202120418418.XU Active CN214380293U (en) | 2021-02-25 | 2021-02-25 | Generating set for supplying power to main pump of nuclear power plant |
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| CN (1) | CN214380293U (en) |
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2021
- 2021-02-25 CN CN202120418418.XU patent/CN214380293U/en active Active
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