CN114172261B - 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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- CN114172261B CN114172261B CN202111290882.6A CN202111290882A CN114172261B CN 114172261 B CN114172261 B CN 114172261B CN 202111290882 A CN202111290882 A CN 202111290882A CN 114172261 B CN114172261 B CN 114172261B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention relates to a nuclear power plant emergency power supply system, which comprises a power supply unit, 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 unit; the power supply system further comprises an additional emergency circuit comprising an additional power supply and a first additional emergency power bus LHC; when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine LHQ of the first unit fail, 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 for 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 provides emergency power for other units of the nuclear power plant, 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 second generation pressurized water reactor nuclear power plant in China is provided with power supplies which supply power to the emergency power bus of the second generation pressurized water reactor nuclear power plant according to the sequence of a main external power supply, an auxiliary external power supply and an internal power supply, and the problems mainly exist as follows: (1) Under extreme weather conditions, there is a possibility that the external power supply and the internal power supply are lost at the same time, for example, a super typhoon, an overhead line of the external power supply may fail due to the inverted tower of the typhoon, and the internal power supply may fail due to tsunami flooding caused by the typhoon. (2) Internal power supplies between non-adjacent units are difficult to reserve. The second generation pressurized water reactor nuclear power plant units are generally constructed in pairs, the paired units are called adjacent units, and otherwise, the paired units are non-adjacent units. The emergency power supply between adjacent units can be mutually standby through the emergency bus, but no corresponding electric connection loop exists between non-adjacent units, and the emergency power supply cannot be directly standby. (3) The on-load test of the emergency diesel generator after regular full power or maintenance needs to utilize the on-grid test of the station service bus, the risk of power failure of the station service 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 the operation and maintenance of the power plant.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nuclear power plant emergency power supply system and a control method which can be used in an emergency and can be used for supplying power to other units of a nuclear power plant in an emergency.
The technical scheme adopted for solving the technical problems is as follows: constructing a nuclear power plant emergency power supply system, wherein the power supply system comprises a power supply group, 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 group, and the power supply group comprises a main external power supply of a main power switching station of a power grid, 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 the plant;
the power supply system further comprises an additional emergency circuit comprising an additional power supply and a first additional emergency power bus LHC; when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine LHQ of the first unit fail, the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit are disconnected, and the additional emergency circuit is connected to supply power for each unit of the nuclear power plant.
Preferably, the additional power supply is connected to the first additional emergency power 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 the 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 the 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 the 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 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 main external 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 supply 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 bus LHD is connected to the first emergency diesel engine 2LHP of the second group via a sixteenth switch CB117, and to the second emergency diesel engine 2LHQ of the second group via a seventeenth switch CB 118.
Preferably, the additional emergency power supply bus LHC is connected to the third and fourth units via an eighteenth switch CB121 on one hand and to the fifth and sixth units via a nineteenth switch CB131 on the other hand.
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 twenty-first switch CB3, one path of 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, one path of the standby power supply bus is connected to a second emergency power supply bus 1LHB of the first unit through a twenty-second switch CB29, one path of the standby diesel engine is connected to a first emergency power supply bus 2LHA of the second unit through a twenty-third switch CB1, and the other path of the standby power supply bus 9LHT is connected to a second emergency power supply bus 2LHB of the second unit through a twenty-fourth switch CB 2.
Preferably, the additional power source is of a different type and location than the first and second emergency diesel engines LHP, LHQ.
Preferably, the additional power source is a high power source.
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 fails, 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 a non-adjacent unit is required to be supplied, a fifth switch CB21 is opened, a sixth switch CB114 is closed, a first emergency diesel engine 1LHP of the first unit is started, when a synchronous grid-connected loop of the fourth switch CB113 detects that the two-end power supply meets grid-connected conditions, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and an eighteenth switch CB121 or a 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 emergency power supply of the non-adjacent unit needs 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, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, so that the emergency power supply of the non-adjacent unit supplies power to the first emergency power supply bus 1LHA of the first unit.
Preferably, when the regular full power test and the maintained load test 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 two ends meet the grid-connected condition, the fourth switch CB113 is closed, so that the load test of the first emergency diesel engine 1LHP of the first unit is realized 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 provides emergency power for other units of the nuclear power plant, 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 for a nuclear power plant in accordance with the present invention;
FIG. 2 is a schematic diagram of the emergency power supply system of the nuclear power plant according to the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present 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, a power supply system for emergency power supply of a nuclear power plant according to the present invention is provided, in which a main circuit of the power supply system includes a power supply group, and in this embodiment, a circuit other than the additional emergency circuit 1 in fig. 1 is referred to as a main circuit, and the main circuit includes a basic device and a switch for supplying power to the power supply of the nuclear power plant. The first emergency power supply bus LHA and the second emergency power supply bus LHB of each unit of the nuclear power plant are powered by a power supply unit, and the power supply unit comprises a main external power supply of a main power switching station of a power grid, 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 the plant; the first emergency diesel LHP and the second emergency diesel LHQ may be collectively referred to as an emergency diesel generator set; the first emergency power bus LHA and the second emergency power bus LHB may be collectively referred to as an emergency service power bus set.
The power supply system further comprises an additional emergency circuit 1, the additional emergency circuit 1 comprising an additional power source and a first additional emergency power bus LHC; the additional emergency circuit 1 takes power from a 10.5kV bus of a construction transformer of the nuclear power plant and is provided with an independent additional power supply, and further, the additional power supply is a high-power supply. When external power is lost, the independent additional power supply can start and supply power by self. Specifically, when the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit fail, 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 for each unit of the nuclear power plant.
Specifically, the main external power supply is 500kV, and is connected with a main transformer substation, one path of the main external power supply is connected with a main generator, one path of the main external power supply is connected with a factory transformer substation A, and one path of the main external power supply is connected with a factory transformer substation B, so that power can be supplied to an emergency factory power bus set of each unit of the nuclear power plant. The auxiliary external power supply specifically 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 220kV, and the first auxiliary external power supply is connected to an 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 and connected to the emergency power bus set of each unit of the nuclear power plant to supply power for the emergency power bus set. When the main external power supply and the auxiliary external power supply are lost, the additional emergency circuit is put into each unit of the nuclear power plant to supply power.
Further, the additional power source is selected and addressed differently from the first emergency diesel LHP and the second emergency diesel LHQ. In order to avoid common mode faults, the type and location of the additional power supply are different from those of the existing emergency diesel generator set.
Further, one path of the main external 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 of the main external power supply is connected to the second emergency power supply bus 1LHB of the first unit through an eleventh switch CB 20;
the auxiliary external power supply is connected to the first additional emergency power bus LHC via 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 power bus LHC through a first switch CB 101; the first additional emergency power supply bus LHC may be a 10kV bus provided by a construction transformer or an additional power supply, and the 10kV emergency power supply is turned into the same voltage as the voltage of the service bus by an isolation transformer to supply power to the emergency service bus. The specific access mode is that 2 switches are allocated between the first emergency diesel engine LHP and the first emergency power supply bus LHA, and 2 switches are allocated between the second emergency diesel engine LHQ and the second emergency power supply bus LHB, so that the access and the switching of power supply are realized. Wherein a synchronous grid-connected loop is configured near a switch of a bus where the isolation transformer is located.
Specifically, the first additional emergency power supply bus LHC is connected to the 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 the 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 the 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 the 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 fail, 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 opening the sixth switch CB114 and the ninth switch CB116, and an additional emergency circuit is connected into each unit of the nuclear power plant for supplying power.
Further, the second additional emergency power bus LHD is connected to the first emergency diesel engine 2LHP of the second group via a sixteenth switch CB117 on one hand and to the second emergency diesel engine 2LHQ of the second group via a seventeenth switch CB118 on the other hand. 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 connected to supply power for the emergency plant power bus group according to requirements. It can be understood that 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 to the emergency station power bus set, so that the adjacent units are mutually standby, and the nuclear power plant can normally operate.
Further, the additional emergency power supply bus LHC is connected to the third and fourth units via an eighteenth switch CB121 on one hand and to the fifth and sixth units via a nineteenth switch CB131 on the other hand. In this embodiment, the adjacent units and the non-adjacent units can be standby directly, and when the first unit and the second unit fail, the non-adjacent units can be selected to supply power by controlling the eighteenth switch CB121 and the nineteenth switch CB131, so that the non-adjacent units are standby.
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 twenty-first switch CB3, one path of 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, one path of the standby power supply bus is connected to a second emergency power supply bus 1LHB of the first unit through a twenty-second switch CB29, one path of the standby power supply bus is connected to a first emergency power supply bus 2LHA of the second unit through a twenty-third switch CB1, and the other path of the standby power supply bus 9LHT is connected to a second emergency power supply bus 2LHB of the second unit through a twenty-fourth switch CB 2.
When the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit fail, the standby diesel engine can also supply power, and the twenty-first switch CB28 and the twenty-second switch CB29 can be controlled to supply 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; by controlling the twenty-third switch CB1 and the twenty-fourth switch CB2, 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 power supply to 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 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 fails, 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, the precondition of the working condition is that the additional power supply fails, and the emergency of the non-adjacent unit can be supplied for standby. Opening a fifth switch CB21, closing a sixth switch CB114, starting a first emergency diesel engine 1LHP of a first unit, closing the fourth switch CB113, the third switch CB112 and the second switch CB111 when a synchronous grid-connected loop of the fourth switch CB113 detects that two-end power supplies meet grid-connected conditions, and closing an eighteenth switch CB121 or a nineteenth switch CB131 of a non-adjacent unit; the first emergency diesel engine 1LHP of the first unit is realized to supply power to emergency power supplies of non-adjacent units;
when the emergency power supply of the non-adjacent unit needs 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, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, so that the emergency power supply of the non-adjacent unit supplies power to the first emergency power supply bus 1LHA of the first unit.
Further, when the regular full-power test and the maintained load test 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 two ends meet the grid-connected condition, the fourth switch CB113 is closed, so that the load test of the first emergency diesel engine 1LHP of the first unit is realized 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 supplies. Meanwhile, a new grid-connected mode is provided for the load test of the existing emergency diesel generator set, and convenience is brought to the operation and maintenance of the nuclear power plant.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (7)
1. The emergency power supply system of the nuclear power plant is characterized by comprising a power supply group, 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 group, and the power supply group comprises a main external power supply of a main power switching station of a power grid, 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 the plant;
the power supply system further comprises an additional emergency circuit comprising an additional power supply and a first additional emergency power bus LHC; when a first emergency diesel engine 1LHP of a first unit and a second emergency diesel engine 1LHQ of the first unit fail, disconnecting the first emergency diesel engine 1LHP of the first unit and the second emergency diesel engine 1LHQ of the first unit, and accessing the additional emergency circuit to supply power for each unit of the nuclear power plant;
the additional power supply is connected to the first additional emergency power 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 the 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 the 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 the 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 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;
one path of the main 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 main 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 supply 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;
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 of the additional emergency power supply bus LHC is connected to the fifth unit and the sixth unit through a nineteenth switch CB131;
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 fails, 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 a non-adjacent unit is required to be supplied, a fifth switch CB21 is opened, a sixth switch CB114 is closed, a first emergency diesel engine 1LHP of the first unit is started, when a synchronous grid-connected loop of the fourth switch CB113 detects that the two-end power supply meets grid-connected conditions, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and an eighteenth switch CB121 or a 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 emergency power supply of the non-adjacent unit needs 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, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, so that the emergency power supply of the non-adjacent unit supplies power to the first emergency power supply bus 1LHA of the first unit.
2. The nuclear plant emergency power supply system of claim 1, wherein the second additional emergency power bus LHD is connected to the first emergency diesel engine 2LHP of the second unit via a sixteenth switch CB117 on one hand and to the second emergency diesel engine 2LHQ of the second unit via a seventeenth switch CB118 on the other hand.
3. The nuclear power plant emergency power supply system according to claim 1, further comprising a backup diesel engine connected to the backup power supply bus 9LHT through a twentieth switch CB3, the backup 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-second 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 fourth switch CB 2.
4. The nuclear power plant emergency power supply system of claim 1, wherein the additional power source is selected and located differently from the first and second emergency diesel engines LHP, LHQ.
5. The nuclear power plant emergency power supply system of claim 1, wherein the additional power source is a high power source.
6. A control method of a nuclear power plant emergency power supply system, applied to the nuclear power plant emergency power supply system according to any one of claims 1 to 5, 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 fails, 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 a non-adjacent unit is required to be supplied, a fifth switch CB21 is opened, a sixth switch CB114 is closed, a first emergency diesel engine 1LHP of the first unit is started, when a synchronous grid-connected loop of the fourth switch CB113 detects that the two-end power supply meets grid-connected conditions, the fourth switch CB113, the third switch CB112 and the second switch CB111 are closed, and an eighteenth switch CB121 or a 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 emergency power supply of the non-adjacent unit needs 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, and the eighteenth switch CB121 or the nineteenth switch CB131 of the non-adjacent unit is closed, so that the emergency power supply of the non-adjacent unit supplies power to the first emergency power supply bus 1LHA of the first unit.
7. The control method of a nuclear power plant emergency power supply system according to claim 6, wherein when a regular full power test and a maintained load test of the emergency diesel engine are required, a fifth switch CB21 is opened, a sixth switch CB114 is closed, the first emergency diesel engine 1LHP of the first unit is started, and when a synchronous grid-connected loop of the fourth switch CB113 detects that both end power supplies meet grid-connected conditions, the fourth switch CB113 is closed, so that the load test of the first emergency diesel engine 1LHP of the first unit is realized through the first additional emergency power supply bus LHC.
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