CN214380506U - Electric generating set with continuously variable transmission for supplying power to main pump of nuclear power plant - Google Patents
Electric generating set with continuously variable transmission for supplying power to main pump of nuclear power plant Download PDFInfo
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- CN214380506U CN214380506U CN202120418314.9U CN202120418314U CN214380506U CN 214380506 U CN214380506 U CN 214380506U CN 202120418314 U CN202120418314 U CN 202120418314U CN 214380506 U CN214380506 U CN 214380506U
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Abstract
The utility model relates to an electric generating set who has continuously variable transmission for nuclear power plant's main pump power supply belongs to nuclear power unit power supply unit technical field. The device comprises a unit incoming line switch, a motor, a continuously variable transmission, a generator and an outgoing line switch; the unit incoming line switch, the motor, the continuously variable transmission, the generator, the unit outgoing line switch and the main pump are connected in sequence. A stepless speed changing box is arranged between the motor and the generator, and the rotating speed of the generator is automatically adjusted according to requirements, so that the frequency of the output alternating current power supply is stepless and adjustable. Therefore, the electric generating set is not only suitable for the normal working period of the main pump, but also suitable for the starting period, and the expensive and unreliable frequency converter can be completely replaced by the utility model; the reliability of power supply is improved.
Description
Technical Field
The utility model relates to an electric generating set who has continuously variable transmission 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: CN202010735659.7) 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. The main pump is powered by the frequency converter when being started, and is powered by the electric generator set during normal working. However, in the scheme, because the rotating speed of the electric generating set cannot be adjusted, the frequency of the output alternating current is fixed to 60Hz, an alternating current power supply of 0-60Hz cannot be provided for the main pump during the starting period of the main pump, and the frequency converter is still required to supply power when the main pump is started.
Disclosure of Invention
The utility model aims at solving the technical problems of high cost and low reliability caused by the driving and the control of the main pump motor by the frequency converter.
In order to solve the above problems, the technical solution adopted by the present invention is to provide an electric generator set with a continuously variable transmission for supplying power to a main pump of a nuclear power plant, comprising a set incoming switch, a motor, a continuously variable transmission, a generator and a set outgoing switch; the unit incoming line switch, the motor, the continuously variable transmission, the generator, the unit outgoing line switch and the main pump are connected in sequence.
Preferably, the electric motor is provided as a synchronous motor.
Preferably, the generator is provided as a synchronous generator.
Preferably, the continuously variable transmission is provided with a controller.
Preferably, a switch is arranged between the unit outgoing switch and the main pump.
Preferably, the number of switches is 2 or more.
Preferably, the switches are arranged in series.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a set up a continuously variable transmission between motor and generator, as required automatically regulated generator rotational speed for output alternating current power supply's frequency is infinitely variable adjustable. Thus, the electric generator set is not only suitable for the normal working period of the main pump, but also suitable for the starting period, and completely replaces an expensive and unreliable frequency converter. After the stepless speed changing box is additionally arranged, the pole pair number of the generator and the motor of the motor generator set does not need to be required.
2. Compared with a main pump frequency converter, the electric generator set has high stability, and the reliability of power supply can be improved. The frequency of the alternating current power supply output by the electric generating set is stepless and adjustable, so that the electric generating set is not only suitable for the normal working period of the main pump, but also suitable for the starting period, and an expensive and unreliable frequency converter is completely replaced.
3. 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 unit incoming line switch; 2. a synchronous motor; 3. a continuously variable transmission; 4. a synchronous generator; 5. a second switch; 6. a third switch; 7. a fourth switch; 8. and (4) a main pump.
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 an electric generating set with a stepless gearbox for supplying power to a main pump of a nuclear power plant, which comprises a set incoming line switch 1, a motor, a stepless speed changer 3, a generator and a set outgoing line switch; the unit incoming line switch 1, the motor, the continuously variable transmission 3, the generator, the unit outgoing line switch and the main pump 8 are connected in sequence. The motor is a synchronous motor 2; the generator is set as a synchronous generator 4. The continuously variable transmission 3 is provided with a controller. And switches are arranged between the outgoing line switches of the unit and the main pump 8, the number of the switches is more than or equal to 2, and the switches are arranged in series.
Examples
As shown in fig. 1, a continuously variable transmission is provided between the motor and the generator to automatically adjust the rotational speed of the generator as needed, so that the frequency of the output ac power is steplessly adjustable. Thus, the electric generator set is not only suitable for the normal working period of the main pump, but also suitable for the starting period, and completely replaces an expensive and unreliable frequency converter. After the stepless speed changing box is additionally arranged, the pole pair number of the generator and the motor of the motor generator set does not need to be required.
The technical scheme of the utility model an electric generating set of AP1000 CAP1000 nuclear power generating set main pump has replaced original converter completely from one set of electric generating set power supply system of upper reaches generating line to main pump 8. A unit incoming line switch 1, a synchronous motor 2, a continuously variable transmission 3, a synchronous generator 4 and three switches are sequentially arranged from an upstream bus to a main pump 8;
the operation steps of the main pump are as follows:
step one, setting the gear ratio of the continuously variable transmission 3 to be 0, and closing a unit incoming line switch 1, a switch II 5, a switch III 6 and a switch IV 7;
and step two, according to the lifting speed requirement of the main pump 8, the speed ratio of the continuously variable transmission 3 is gradually adjusted through the controller, the speed of the synchronous generator 4 is adjusted in a stepless manner, and the expected output frequency is obtained.
The power supply of the main pump 8 of the 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 0-60Hz power supply to supply power to the main pump 8 after passing through the electric generating set. The main pump 8 is powered by the electric generator set, whether during normal operation or during start-up.
The electric generating set gets electricity from a 10.5kV bus, and the electric generating set consists of 1 synchronous motor 2, 1 synchronous generator 4 and a continuously variable transmission 3. The inlet of the motor generator set is provided with a set inlet switch 1 as a set inlet switch, and the outlet of the set is provided with a switch II 5 as a set outlet switch.
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 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 (7)
1. The utility model provides an electric generating set who has infinitely variable transmission for nuclear power plant's main pump power supply which characterized in that: the system comprises a unit incoming line switch, a motor, a continuously variable transmission, a generator and a unit outgoing line switch; the unit incoming line switch, the motor, the continuously variable transmission, the generator, the unit outgoing line switch and the main pump are connected in sequence.
2. An electric generating set with a continuously variable transmission for powering a main pump of a nuclear power plant according to claim 1, characterized in that: the motor is a synchronous motor.
3. An electric generating set with a continuously variable transmission for powering a main pump of a nuclear power plant according to claim 2, characterized in that: the generator is set as a synchronous generator.
4. A dynamoelectric machine set with a continuously variable transmission for powering a nuclear power plant primary pump, as recited in claim 3, wherein: the continuously variable transmission is provided with a controller.
5. An electric generating set with a continuously variable transmission for powering a main pump of a nuclear power plant according to claim 4, characterized in that: and a switch is arranged between the unit outgoing switch and the main pump.
6. An electric generating set with a continuously variable transmission for powering a nuclear power plant main pump according to claim 5, characterized in that: the number of the switches is more than or equal to 2.
7. An electric generating set with a continuously variable transmission for powering a main pump of a nuclear power plant according to claim 6, characterized in that: the switches are arranged in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120418314.9U CN214380506U (en) | 2021-02-25 | 2021-02-25 | Electric generating set with continuously variable transmission for supplying power to main pump of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120418314.9U CN214380506U (en) | 2021-02-25 | 2021-02-25 | Electric generating set with continuously variable transmission for supplying power to main pump of nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214380506U true CN214380506U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120418314.9U Active CN214380506U (en) | 2021-02-25 | 2021-02-25 | Electric generating set with continuously variable transmission for supplying power to main pump of nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214380506U (en) |
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2021
- 2021-02-25 CN CN202120418314.9U patent/CN214380506U/en active Active
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