CN114172261A - Nuclear power plant emergency power supply system and control method - Google Patents
Nuclear power plant emergency power supply system and control method Download PDFInfo
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- CN114172261A CN114172261A CN202111290882.6A CN202111290882A CN114172261A CN 114172261 A CN114172261 A CN 114172261A CN 202111290882 A CN202111290882 A CN 202111290882A CN 114172261 A CN114172261 A CN 114172261A
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- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
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- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- 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
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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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention relates to an emergency power supply system of a nuclear power plant, which comprises a power supply set, wherein a first emergency power supply bus LHA and a second emergency power supply bus LHB of each unit of the nuclear power plant are supplied with power by the power supply set; the power supply system further comprises an additional emergency circuit, wherein the additional emergency circuit comprises an additional power supply and a first additional emergency power supply bus LHC; when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine LHQ of the first unit have faults, the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit are disconnected, and an additional emergency circuit is connected to supply power to each unit of the nuclear power plant. The invention also relates to a control method of the nuclear power plant emergency power supply system, which is applied to the nuclear power plant emergency power supply system. The invention provides a new emergency power supply circuit for the emergency bus of the nuclear power plant, and supplies power for other units of the nuclear power plant in an emergency manner, thereby further improving the power supply reliability of the emergency power supply.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a nuclear power plant emergency power supply system and a control method.
Background
The emergency bus of the domestic second-generation pressurized water reactor nuclear power plant is provided with power supplies, and the power supplies supply power for the emergency service bus according to the sequence of a main external power supply, an auxiliary external power supply and an internal power supply, so that the following problems mainly exist: (1) under extreme weather conditions, there is a possibility that both the external power source and the internal power source are lost, such as ultra-strong typhoon, the overhead line of the external power source may fail due to tower collapse by typhoon, and the internal power source may fail due to tsunami flooding caused by typhoon. (2) The mutual standby of internal power supplies between non-adjacent units is difficult. The second generation pressurized water reactor nuclear power plant units are generally built in pairs, the units built in pairs are called adjacent units, otherwise, the units are non-adjacent units. The emergency power supplies between adjacent units can be mutually standby through an emergency bus under the current condition, but corresponding electrical connection loops do not exist between non-adjacent units, and the emergency power supplies cannot be directly standby. (3) The regular full power or on-load test after maintenance of the emergency diesel generator needs to utilize an auxiliary bus grid-connected test, so that the risk of losing power of the auxiliary bus is caused, the emergency diesel generator needs to be arranged in a specific time window or externally connected with a test load, and inconvenience is brought to operation and maintenance of a power plant.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nuclear power plant emergency power supply system which can be put into use in an emergency and can supply power for other units of a nuclear power plant in an emergency manner and a control method thereof aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing an emergency power supply system of a nuclear power plant, wherein the power supply system comprises a power supply set, a first emergency power supply bus LHA and a second emergency power supply bus LHB of each unit of the nuclear power plant are supplied with power by the power supply set, and the power supply set comprises an external main power supply of a main switch station of a power grid, an auxiliary external power supply of an auxiliary switch station and an emergency power supply supplied with power by a first emergency diesel engine LHP and a second emergency diesel engine LHQ in the plant;
the power supply system further comprises an additional emergency circuit, wherein the additional emergency circuit comprises an additional power supply and a first additional emergency power supply bus LHC; and when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine LHQ of the first unit have faults, disconnecting the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit, and connecting the additional emergency circuit to supply power for each unit of the nuclear power plant.
Preferably, said additional power supply is connected to said first additional emergency supply bus LHC through a first switch CB 101; the first additional emergency power supply bus LHC is connected to a second additional emergency power supply bus LHD sequentially through a second switch CB111, an isolation transformer and a third switch CB112, one path of the second additional emergency power supply bus LHD is connected to a first emergency power supply bus 1LHA of the first unit through a fourth switch CB113 and a fifth switch CB21, and the other path of the second additional emergency power supply bus LHD is connected to a second emergency power supply bus 1LHB of the first unit through a seventh switch CB115 and an eighth switch CB 22;
the first emergency diesel engine 1LHP of the first unit is connected to a first emergency power supply bus 1LHA of the first unit through a sixth switch CB114 and a fifth switch CB21, the second emergency diesel engine 1LHQ of the first unit is connected to a second emergency power supply bus 1LHB of the first unit through a ninth switch CB116 and an eighth switch CB22, and the first emergency diesel engine 1LHP and the second emergency diesel engine 1LHQ of the first unit are used for supplying power to the first emergency power supply bus 1LHA of the first unit and the second emergency power supply bus 1LHB of the first unit.
Preferably, one path of the external power supply is connected to a first emergency power supply bus 1LHA of the first unit through a tenth switch CB19, and the other path of the external power supply is connected to a second emergency power supply bus 1LHB of the first unit through an eleventh switch CB 20;
the auxiliary external power source is connected to the first additional emergency power supply bus LHC through a twelfth switch CB06, a thirteenth switch CB09, a construction transformer, a fourteenth switch CB148 and a fifteenth switch CB 100.
Preferably, the second additional emergency power supply bus LHD is connected to the first emergency diesel engine 2LHP of the second unit in one path through a sixteenth switch CB117, and connected to the second emergency diesel engine 2LHQ of the second unit in the other path through a seventeenth switch CB 118.
Preferably, one path of the additional emergency power supply bus LHC is connected to the third unit and the fourth unit through an eighteenth switch CB121, and the other path is connected to the fifth unit and the sixth unit through a nineteenth switch CB 131.
Preferably, the emergency power supply system of the nuclear power plant further comprises a standby diesel engine, the standby diesel engine is connected to a standby power supply bus 9LHT through a twentieth switch CB3, the standby power supply bus 9LHT is connected to a first emergency power supply bus 1LHA of the first unit through a twenty-first switch CB28, is connected to a second emergency power supply bus 1LHB of the first unit through a twenty-second switch CB29, is connected to a first emergency power supply bus 2LHA of the second unit through a twentieth switch CB1, and is connected to a second emergency power supply bus 2LHB of the second unit through a twenty-fourth switch CB 2.
Preferably, the type and location of the additional power source is different from the first emergency diesel engine LHP and the second emergency diesel engine LHQ.
Preferably, the additional power supply is a high power supply.
The invention also constructs a control method of the nuclear power plant emergency power supply system, which is applied to the nuclear power plant emergency power supply system and comprises the following steps:
in a normal state, the fourth switch CB113 and the tenth switch CB19 are opened, the sixth switch CB114 and the fifth switch CB21 are closed, and the first emergency diesel engine 1LHP of the first unit supplies power to the first emergency power supply bus 1LHA of the first unit;
when the first emergency diesel engine 1LHP of the first unit has a fault, the sixth switch CB114 and the tenth switch CB19 are opened, the first switch CB101, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, and the first additional emergency power supply bus LHC supplies power to the first emergency power supply bus 1LHA of the first unit;
when the emergency power supply of the non-adjacent unit needs to be supplied, the fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, when the synchronous grid-connected loop of the fourth switch CB113 detects that the power supplies at the two ends meet the grid-connected condition, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed; realizing that a first emergency diesel engine 1LHP of the first unit supplies power to an emergency power supply of the non-adjacent unit;
when the power supply of the emergency power supply of the non-adjacent unit is required to be received, the sixth switch CB114 and the tenth switch CB19 are opened, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, and the emergency power supply of the non-adjacent unit is enabled to supply power to the first emergency diesel engine 1LHP of the first unit.
Preferably, when the regular full power test and the on-load test after maintenance of the emergency diesel engine are required, the fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, and when the synchronous grid-connected loop of the fourth switch CB113 detects that the power supplies at the two ends meet the grid-connected condition, the fourth switch CB113 is closed, so that the first emergency diesel engine 1LHP of the first unit is subjected to the on-load test through the first additional emergency power supply bus LHC.
The implementation of the invention has the following beneficial effects: the invention provides a new emergency power supply circuit for the emergency bus of the nuclear power plant, and supplies power for other units of the nuclear power plant in an emergency manner, thereby further improving the power supply reliability of the emergency power supply.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of an emergency power supply system of a nuclear power plant according to the present invention;
FIG. 2 is a schematic diagram of the emergency power supply system of the nuclear power plant.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Referring to fig. 1-2, the emergency power supply system for nuclear power plant of the present invention has a main circuit including a power supply pack, in this embodiment, a circuit other than the emergency circuit 1 shown in fig. 1 is referred to as a main circuit, and the main circuit includes basic devices and switches for supplying power to the nuclear power plant. A first emergency power supply bus LHA and a second emergency power supply bus LHB of each unit of the nuclear power plant are supplied with power by a power pack, and the power pack comprises an external main power supply of a main switch station of a power grid, an auxiliary external power supply of an auxiliary switch station and an emergency power supply supplied with power by a first emergency diesel engine LHP and a second emergency diesel engine LHQ in the plant; the first emergency diesel engine LHP and the second emergency diesel engine LHQ can be collectively called as an emergency diesel generator set; the first emergency power supply bus LHA and the second emergency power supply bus LHB may be collectively referred to as an emergency service bus group.
The power supply system further comprises an additional emergency circuit 1, wherein the additional emergency circuit 1 comprises an additional power supply and a first additional emergency power supply bus LHC; the additional emergency circuit 1 takes electricity from a 10.5kV bus of a construction transformer of a nuclear power plant, and is provided with an independent additional power supply, and further the additional power supply is a high-power supply. When the external power is lost, the independent additional power supply can start and supply power by itself. Specifically, when a first emergency diesel engine 1LHP of the first unit and a second emergency diesel engine 1LHQ of the first unit have faults, the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit are disconnected, and an additional emergency circuit is connected to supply power to each unit of the nuclear power plant.
Specifically, the main external power supply is 500kV, and the main external power supply is continuous with main transformer substation, and it is continuous with main generator all the way, connects plant substation A all the way, connects plant substation B all the way, can supply power for the emergent station service generating line group of each unit of nuclear power plant. The auxiliary external power supply comprises a first auxiliary external power supply and a second auxiliary external power supply, the first auxiliary external power supply and the second auxiliary external power supply are both 220kV, and the first auxiliary external power supply is connected to the additional emergency circuit through a construction transformer; the second auxiliary external power supply is respectively connected with the first auxiliary transformer substation and the second auxiliary transformer substation, is connected to the emergency service bus group of each unit of the nuclear power plant, and supplies power for the emergency service bus group. When the main external power supply and the auxiliary external power supply are lost, the additional emergency circuit is put into the nuclear power plant to supply power for each unit.
Further, the type and address of the additional power supply are different from the first emergency diesel engine LHP and the second emergency diesel engine LHQ. In order to avoid common-mode faults, the type selection and the site selection of the additional power supply are different from those of the existing emergency diesel generator set.
Further, one path of the external power supply is connected to a first emergency power supply bus 1LHA of the first unit through a tenth switch CB19, and the other path of the external power supply is connected to a second emergency power supply bus 1LHB of the first unit through an eleventh switch CB 20;
the auxiliary external power source is connected to the first additional emergency power supply bus LHC through a twelfth switch CB06, a thirteenth switch CB09, a construction transformer, a fourteenth switch CB148 and a fifteenth switch CB 100.
Further, the additional power supply is connected to the first additional emergency supply bus LHC through a first switch CB 101; the first additional emergency power supply bus LHC can be a 10kV bus provided by a construction transformer or an additional power supply, and the 10kV emergency power supply becomes the same voltage as the station service power bus through an isolation transformer and supplies power to the emergency station service power bus. The specific access mode is that 2 switches are configured between a first emergency diesel engine LHP and a first emergency power supply bus LHA, and 2 switches are configured between a second emergency diesel engine LHQ and a second emergency power supply bus LHB, so that the access and the switching of the power supply are realized. And the switch adjacent to the bus where the isolation transformer is located is configured with a synchronous grid-connected loop.
Specifically, the first additional emergency power supply bus LHC is connected to the second additional emergency power supply bus LHD sequentially through the second switch CB111, the isolation transformer and the third switch CB112, one path of the second additional emergency power supply bus LHD is connected to the first emergency power supply bus 1LHA of the first unit through the fourth switch CB113 and the fifth switch CB21, and the other path of the second additional emergency power supply bus LHD is connected to the second emergency power supply bus 1LHB of the first unit through the seventh switch CB115 and the eighth switch CB 22.
The first emergency diesel engine 1LHP of the first unit is connected to a first emergency power supply bus 1LHA of the first unit through a sixth switch CB114 and a fifth switch CB21, the second emergency diesel engine 1LHQ of the first unit is connected to the emergency power supply bus 1LHB of the first unit through a ninth switch CB116 and an eighth switch CB22, and the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit are used for supplying power to the first emergency power supply bus 1LHA of the first unit and the first emergency power supply bus 1LHB of the first unit. When the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit have faults, the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit can be disconnected from the main circuit by disconnecting the sixth switch CB114 and the ninth switch CB116, and the additional emergency circuit is connected to each unit of the nuclear power plant to supply power.
Further, the second additional emergency power supply bus LHD is connected to the first emergency diesel engine 2LHP of the second unit through a sixteenth switch CB117 in one path, and connected to the second emergency diesel engine 2LHQ of the second unit through a seventeenth switch CB118 in the other path. By controlling the sixteenth switch CB117 and the seventeenth switch CB118, the first emergency diesel engine 2LHP of the second unit and/or the second emergency diesel engine 2LHQ of the second unit can be accessed according to the requirement to supply power to the emergency service bus group. Understandably, the first unit and the second unit are adjacent units, when one unit fails and cannot normally operate, the other unit is used for supplying power instead, the emergency service bus group is used for supplying power, the adjacent units are mutually standby, and normal operation of a nuclear power plant is guaranteed.
Further, the additional emergency power supply bus LHC is connected to the third unit and the fourth unit through an eighteenth switch CB121 on one path, and is connected to the fifth unit and the sixth unit through a nineteenth switch CB131 on the other path. The third unit and the fourth unit are adjacent units, the fifth unit and the sixth unit are adjacent units, in this embodiment, the adjacent units and the nonadjacent units can directly be standby each other, when the first unit and the second unit break down, the nonadjacent units can be selected to supply power by controlling the eighteenth switch CB121 and the nineteenth switch CB131, and the nonadjacent units are standby each other.
Further, the emergency power supply system of the nuclear power plant further comprises a standby diesel engine, the standby diesel engine is connected to a standby power supply bus 9LHT through a twentieth switch CB3, the standby power supply bus 9LHT is connected to a first emergency power supply bus 1LHA of the first unit through a twenty-first switch CB28 on one way, is connected to a second emergency power supply bus 1LHB of the first unit through a twenty-second switch CB29 on one way, is connected to a first emergency power supply bus 2LHA of the second unit through a twenty-third switch CB1 on one way, and is connected to a second emergency power supply bus 2LHB of the second unit through a twenty-fourth switch CB2 on the other way.
When a first emergency diesel engine 1LHP of the first unit and a second emergency diesel engine 1LHQ of the first unit have faults, the standby diesel engine can be used for supplying power, and the first emergency power supply bus 1LHA of the first unit and the second emergency power supply bus 1LHB of the first unit can be supplied with power by controlling a twenty-first switch CB28 and a twenty-second switch CB 29; through controlling the twenty-fourth switch CB2 and the twenty-third switch CB1, the power can be supplied to the first emergency power supply bus 2LHA of the second unit and the second emergency power supply bus 2LHB of the second unit, and the power supply for the adjacent units is realized.
The invention also constructs a control method of the nuclear power plant emergency power supply system, which can be applied to the nuclear power plant emergency power supply system, and the control method comprises the following steps:
in a normal state, the fourth switch CB113 and the tenth switch CB19 are opened, the sixth switch CB114 and the fifth switch CB21 are closed, and the first emergency diesel engine 1LHP of the first unit supplies power to the first emergency power supply bus 1LHA of the first unit;
when the first emergency diesel engine 1LHP of the first unit has a fault, the sixth switch CB114 and the tenth switch CB19 are opened, the first switch CB101, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, and the first additional emergency power supply bus LHC supplies power to the first emergency power supply bus 1LHA of the first unit;
when the emergency power supply of the non-adjacent unit is required to be supplied with power, the precondition of the working condition is that the additional power supply fails, and the emergency of the non-adjacent unit can supply power for standby. The fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, when the synchronous grid-connected loop of the fourth switch CB113 detects that power supplies at two ends meet grid-connected conditions, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed; the method comprises the following steps that a first emergency diesel engine 1LHP of a first unit supplies power to an emergency power supply of a non-adjacent unit;
when the power supply of the emergency power supply of the non-adjacent unit is required to be received, the sixth switch CB114 and the tenth switch CB19 are opened, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, and the emergency power supply of the non-adjacent unit is enabled to supply power to the first emergency diesel engine 1LHP of the first unit.
Further, when a regular full power test and a load test after maintenance of the emergency diesel engine are required, the fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, and when the synchronous grid-connected loop of the fourth switch CB113 detects that the power supplies at the two ends meet the grid-connected condition, the fourth switch CB113 is closed, so that the first emergency diesel engine 1LHP of the first unit is subjected to the load test through the first additional emergency power supply bus LHC.
The invention can provide a new emergency power supply circuit for the emergency bus of the second generation pressurized water reactor nuclear power plant, realizes mutual standby of emergency power supplies between non-adjacent units and further improves the power supply reliability of the emergency power supply. Meanwhile, a new grid-connected mode is provided for the on-load test of the existing emergency diesel generator set, and convenience is brought to the operation and maintenance of a nuclear power plant.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The nuclear power plant emergency power supply system is characterized by comprising a power supply set, wherein a first emergency power supply bus LHA and a second emergency power supply bus LHB of each unit of the nuclear power plant are powered by the power supply set, and the power supply set comprises an external main power supply of a power grid main switching station, an auxiliary external power supply of an auxiliary switching station and an emergency power supply powered by a first emergency diesel engine LHP and a second emergency diesel engine LHQ in a plant;
the power supply system further comprises an additional emergency circuit, wherein the additional emergency circuit comprises an additional power supply and a first additional emergency power supply bus LHC; and when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine LHQ of the first unit have faults, disconnecting the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit, and connecting the additional emergency circuit to supply power for each unit of the nuclear power plant.
2. The nuclear plant emergency power supply system of claim 1, wherein the additional power source is connected to the first additional emergency power supply bus LHC through a first switch CB 101; the first additional emergency power supply bus LHC is connected to a second additional emergency power supply bus LHD sequentially through a second switch CB111, an isolation transformer and a third switch CB112, one path of the second additional emergency power supply bus LHD is connected to a first emergency power supply bus 1LHA of the first unit through a fourth switch CB113 and a fifth switch CB21, and the other path of the second additional emergency power supply bus LHD is connected to a second emergency power supply bus 1LHB of the first unit through a seventh switch CB115 and an eighth switch CB 22;
the first emergency diesel engine 1LHP of the first unit is connected to a first emergency power supply bus 1LHA of the first unit through a sixth switch CB114 and a fifth switch CB21, the second emergency diesel engine 1LHQ of the first unit is connected to a second emergency power supply bus 1LHB of the first unit through a ninth switch CB116 and an eighth switch CB22, and the first emergency diesel engine 1LHP and the second emergency diesel engine 1LHQ of the first unit are used for supplying power to the first emergency power supply bus 1LHA of the first unit and the second emergency power supply bus 1LHB of the first unit.
3. The nuclear power plant emergency power supply system of claim 2, wherein one path of the off-board power supply is connected to the first emergency power supply bus 1LHA of the first unit through a tenth switch CB19, and the other path is connected to the second emergency power supply bus 1LHB of the first unit through an eleventh switch CB 20;
the auxiliary external power source is connected to the first additional emergency power supply bus LHC through a twelfth switch CB06, a thirteenth switch CB09, a construction transformer, a fourteenth switch CB148 and a fifteenth switch CB 100.
4. The nuclear power plant emergency power supply system of claim 2, wherein the second additional emergency power supply bus LHD is connected to the first emergency diesel engine 2LHP of the second unit through a sixteenth switch CB117 in one path and to the second emergency diesel engine 2LHQ of the second unit through a seventeenth switch CB118 in the other path.
5. The nuclear power plant emergency power supply system of claim 2, wherein the additional emergency power supply bus LHC is connected to the third unit and the fourth unit through an eighteenth switch CB121 on one hand and to the fifth unit and the sixth unit through a nineteenth switch CB131 on the other hand.
6. The nuclear power plant emergency power supply system of claim 2, further comprising a standby diesel engine connected to a standby power supply bus 9LHT through a twentieth switch CB3, the standby power supply bus 9LHT being connected to the first emergency power supply bus 1LHA of the first unit through a twenty-first switch CB28, to the second emergency power supply bus 1LHB of the first unit through a twenty-twelfth switch CB29, to the first emergency power supply bus 2LHA of the second unit through a twenty-third switch CB1, and to the second emergency power supply bus 2LHB of the second unit through a twenty-fourteenth switch CB 2.
7. The nuclear power plant emergency power supply system of claim 2, wherein the additional power source is of a different type and location than the first and second emergency diesel engines LHP and LHQ.
8. The nuclear power plant emergency power supply system of claim 2, wherein the additional power source is a high power source.
9. A method for controlling an emergency power supply system of a nuclear power plant, which is applied to the emergency power supply system of the nuclear power plant according to any one of claims 3 to 8, comprising:
in a normal state, the fourth switch CB113 and the tenth switch CB19 are opened, the sixth switch CB114 and the fifth switch CB21 are closed, and the first emergency diesel engine 1LHP of the first unit supplies power to the first emergency power supply bus 1LHA of the first unit;
when the first emergency diesel engine 1LHP of the first unit has a fault, the sixth switch CB114 and the tenth switch CB19 are opened, the first switch CB101, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, and the first additional emergency power supply bus LHC supplies power to the first emergency power supply bus 1LHA of the first unit;
when the emergency power supply of the non-adjacent unit needs to be supplied, the fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, when the synchronous grid-connected loop of the fourth switch CB113 detects that the power supplies at the two ends meet the grid-connected condition, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed; realizing that a first emergency diesel engine 1LHP of the first unit supplies power to an emergency power supply of the non-adjacent unit;
when the power supply of the emergency power supply of the non-adjacent unit is required to be received, the sixth switch CB114 and the tenth switch CB19 are opened, the second switch CB111, the third switch CB112, the fourth switch CB113 and the fifth switch CB21 are closed, the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, and the emergency power supply of the non-adjacent unit is enabled to supply power to the first emergency diesel engine 1LHP of the first unit.
10. The control method of the nuclear power plant emergency power supply system according to claim 9, wherein when a regular full power test and a load test after maintenance on the emergency diesel engine are required, the fifth switch CB21 is opened, the sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, and when the synchronous grid-connection loop of the fourth switch CB113 detects that the power supplies at two ends meet the grid-connection condition, the fourth switch CB113 is closed, so that the load test of the first emergency diesel engine 1LHP of the first unit through the first additional emergency power supply bus LHC is realized.
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Effective date of registration: 20230103 Address after: B105, Floor 01, Dayawan Nuclear Power Base, Pengcheng Community, Dapeng Street, Dapeng New District, Shenzhen, Guangdong 518120 Applicant after: GUANGDONG NUCLEAR POWER JOINT VENTURE Co.,Ltd. Applicant after: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: CHINA GENERAL NUCLEAR POWER Corp. Applicant after: CGN POWER Co.,Ltd. Address before: 215008 no.1688, West Ring Road, Suzhou City, Jiangsu Province Applicant before: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Applicant before: CHINA GENERAL NUCLEAR POWER Corp. Applicant before: CGN POWER Co.,Ltd. |
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