CN110912262B - Electric medium-voltage bus emergency power supply access device and method - Google Patents
Electric medium-voltage bus emergency power supply access device and method Download PDFInfo
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- CN110912262B CN110912262B CN201911084899.9A CN201911084899A CN110912262B CN 110912262 B CN110912262 B CN 110912262B CN 201911084899 A CN201911084899 A CN 201911084899A CN 110912262 B CN110912262 B CN 110912262B
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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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Abstract
The invention provides an electric medium-voltage bus emergency power supply access device which is used on three medium-voltage buses, wherein one medium-voltage bus is a relay bus connected with a fifth diesel engine, and the other two medium-voltage buses are respectively connected with a newly-added diesel engine and a relay bus connected with the fifth diesel engine; the device comprises six medium-voltage access handcarts; if two emergency diesel generating sets of different nuclear power generating sets fail, driving two medium-voltage access handcarts to connect a newly-added diesel engine, a medium-voltage bus correspondingly connected with the newly-added diesel engine and an emergency safety bus of a failed emergency diesel generating set together and start independent power supply; and driving the other four medium-voltage access handcarts to connect the fifth diesel engine, the relay bus, the medium-voltage bus connected with the relay bus and the emergency safety bus of the other emergency diesel generator set together and start independent power supply. By implementing the method, the newly-added diesel engine can be quickly replaced for any one of the four EDGs in the power plant, and the problem of mutual interference between the newly-added diesel engine and the fifth diesel engine can be avoided.
Description
Technical Field
The invention relates to the technical field of power utilization access, in particular to an electric medium-voltage bus emergency power supply access device and method.
Background
In order to ensure safe and stable operation, the nuclear power plant is provided with multiple power supplies, and taking a CPR1000 pile type unit as an example, each power supply comprises:
-an off-plant main power supply: an external 500kV power grid;
-an off-plant auxiliary power supply: an external 220kV power grid;
-emergency power supply in the factory: each unit is provided with 2 Emergency Diesel Generators (EDG);
-and-others: the additional diesel engine (also called fifth diesel engine) and mobile diesel engine in the factory site.
Since the mobile diesel engine is temporarily connected to a power supply after an over-design-standard accident and has a limited capacity, it will not be discussed here. The main power supply outside the plant and the auxiliary power supply outside the plant supply power for the medium-voltage bus through the service transformer, and the EDG and the fifth diesel engine directly supply power for the emergency safety bus.
Fig. 1 shows a schematic diagram of emergency power access to an electrical medium-voltage bus of a nuclear power plant in the prior art. The nuclear power plant comprises two units; wherein, 1LHP, 1LHQ are two EDGs that No. 1 unit disposes, 2LHP, 2LHQ are two EDGs that No. 2 unit disposes, 0LHS is the fifth diesel engine. At the moment, 1LHP, 1LHQ, 2LHP and 2LHQ on the No. 1 and No. 2 units are respectively connected into corresponding emergency safety buses 1LHA, 1LHB, 2LHA and 2LHB to supply power for relevant equipment. When a certain EDG fails, the fifth diesel engine 0LHS can be connected to the station medium-voltage system through the medium-voltage buses 0LHT and 9LHT to replace the failed EDG to supply power for corresponding emergency safety buses in the emergency safety buses 1LHA/1LHB/2LHA/2 LHB.
However, the existing EDG has the problems of high equipment failure rate, large failure risk, inflexible maintenance arrangement and the like. Therefore, in order to solve the above problems, another access method of emergency power supply of the electric medium voltage bus is adopted, as shown in fig. 2. In fig. 2, the power plant is additionally provided with 1 diesel engine to replace the original EDG on the basis of the existing fifth diesel generator 0LHS, and the newly added diesel engine is connected from the medium-voltage bus 9LHT to achieve the following purposes: 1) During the integral model changing and reforming period of the original EDG, the EDG is used as a substitute power supply; 2) The serious consequences caused by all failures of the EDG under the external flooding disaster of the super-design standard are relieved, and the power supply reliability of the emergency power supply of the power station is improved. However, analysis finds that the scheme has the problem that the access of the newly-added diesel engine and the 0LHS of the fifth diesel engine interfere with each other, such as: when newly-increased diesel engine replaces the 1LHP of inefficacy, supply power for emergent safe 1LHA of generating line through medium voltage bus 9LHT, medium voltage bus 9LHT live-line operation this moment, if 2LHP/2LHQ inefficacy appears, then because medium voltage bus 9LHT is occupied, lead to the 0LHS of fifth platform diesel engine not to insert (the leading cause lies in for preventing that two way power is non-contemporaneous paralleling), consequently can't realize the replacement to 2LHP/2 LHQ.
Therefore, urgent need for an emergent power supply access device of electric middling pressure generating line, can not only realize newly-increased diesel engine and replace the arbitrary one in four EDGs of power plant fast, can also avoid newly-increased diesel engine and the problem of fifth diesel engine access mutual interference.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an electric medium-voltage bus emergency power supply access device and method, which can not only realize the quick replacement of any one of four EDGs in a power plant by a newly-added diesel engine, but also avoid the problem of mutual interference between the newly-added diesel engine and the access of a fifth diesel engine.
In order to solve the technical problem, an embodiment of the present invention provides an emergency power supply access device for an electrical medium-voltage bus, which is used for three medium-voltage buses; one medium-voltage bus is a relay bus used for connecting a fifth diesel engine, and the other two medium-voltage buses are respectively used for connecting a newly-added diesel engine and the relay bus connected with the fifth diesel engine and providing emergency power supply for any one of four emergency safety buses and four emergency diesel generator sets or two emergency safety buses which fail and cannot have the power supply function and belong to different nuclear power generator sets;
the electric medium-voltage bus emergency power supply access device comprises six medium-voltage access handcarts;
if two of the four emergency diesel generating sets which belong to different nuclear power generating sets fail, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generating set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generating set through the medium-voltage bus correspondingly connected with the newly-added diesel engine; and
and driving one of the other four medium-voltage access handcarts to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, connecting the output end of the relay bus connected with the fifth diesel engine with the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together after two of the other four medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine with the emergency safety bus corresponding to the other failed emergency diesel generator set together by the last medium-voltage bus, and independently supplying power to the emergency safety bus corresponding to the other failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus after the fifth diesel engine is started.
If one of the four emergency diesel generator sets fails, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generator set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started to independently supply power to the emergency safety bus corresponding to the failed emergency diesel generator set through the medium-voltage bus correspondingly connected with the newly-added diesel engine.
If one of the four emergency diesel generator sets fails, one of the four medium-voltage access handcarts is driven to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, two of the four emergency diesel generator sets are connected in series and then connect the output end of the relay bus connected with the fifth diesel engine and the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together, and the last emergency diesel generator set connects the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine and the emergency safety bus corresponding to the failed emergency diesel generator set together, so that the fifth diesel engine is started and independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus.
And the six medium-voltage access handcarts are all movable trolleys with conductive performance.
And the four emergency diesel generator sets are connected with corresponding safety emergency buses through a breaker trolley.
The breaker trolley is a movable trolley with conductive performance.
The embodiment of the invention also provides an emergency power supply access method for the electric medium-voltage bus, which is realized on an emergency power supply access device for the electric medium-voltage bus, wherein the emergency power supply access device comprises six medium-voltage access handcarts used for three medium-voltage buses; one medium-voltage bus is a relay bus used for connecting a fifth diesel engine, and the other two medium-voltage buses are respectively used for connecting a newly-added diesel engine and the relay bus connected with the fifth diesel engine and providing emergency power supply for any one of four emergency safety buses and four emergency diesel generator sets or two emergency safety buses which fail and cannot have the power supply function and belong to different nuclear power generator sets; the method comprises the following steps:
detecting the running states of four emergency diesel generator sets; wherein the operating state is normal or failure;
if two of the four emergency diesel generating sets which belong to different nuclear power generating sets fail, one of the two medium-voltage access handcarts is driven to connect the input ends of a newly-added diesel engine and a medium-voltage bus correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generating set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generating set through the medium-voltage bus correspondingly connected with the newly-added diesel engine; and
and driving one of the other four medium-voltage access handcarts to connect the input ends of a fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, connecting the output end of the relay bus connected with the fifth diesel engine with the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together after two of the other four medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine with the emergency safety bus corresponding to the other failed emergency diesel generator set together by the last medium-voltage bus, and independently supplying power to the emergency safety bus corresponding to the other failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus after the fifth diesel engine is started.
Wherein the method further comprises the steps of:
if one of the four emergency diesel generator sets fails, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other one of the four emergency diesel generator sets connects the emergency safety buses corresponding to the failed emergency diesel generator set with the output ends of the medium-voltage buses correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety buses corresponding to the failed emergency diesel generator set through the medium-voltage buses correspondingly connected with the newly-added diesel engine.
Wherein the method further comprises the steps of:
if one of the four emergency diesel generator sets fails, one of the four medium-voltage access handcarts is driven to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, two of the four emergency diesel generator sets are connected in series and then connect the output end of the relay bus connected with the fifth diesel engine and the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together, and the last emergency diesel generator set connects the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine and the emergency safety bus corresponding to the failed emergency diesel generator set together, so that the fifth diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus.
The embodiment of the invention has the following beneficial effects:
1. the access of a newly-added diesel engine of the power plant is realized, a backup power supply is added for the unit, and the reliability of emergency power supply of the power plant can be effectively improved;
2. the invention provides an alternative power supply for the original EDG, so that the long-term maintenance/modification of the EDG during the normal operation of the reactor becomes possible;
3. the invention realizes the replacement of '1 to N' of the newly added diesel engine, has flexible access and wide power supply coverage;
4. the invention avoids the mutual interference when the newly-added diesel engine and the fifth diesel engine are accessed, and gives consideration to the power supply functions of the newly-added diesel engine and the fifth diesel engine;
5. the invention does not additionally increase the occupied space of excessive equipment and does not need to adjust the existing factory buildings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic connection diagram of an emergency power supply access mode of an electrical medium voltage bus in the prior art;
fig. 2 is a schematic connection diagram of another connection mode of emergency power supply of an electrical medium-voltage bus in the prior art;
fig. 3 is a schematic connection diagram of an electrical medium voltage bus emergency power supply access device applied to electrical medium voltage bus emergency power supply access according to an embodiment of the present invention;
fig. 4 is a flowchart of an electrical medium voltage bus emergency power supply access method according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3, in the embodiment of the present invention, an electrical medium voltage bus emergency power supply access device is provided, which is used for three medium voltage buses 9LHT1/9LHT2/0 LHT; wherein, one medium-voltage bus 0LHT is a relay bus used for connecting a fifth diesel engine G1, and the other two medium-voltage buses 9LHT1/9LHT2 are respectively used for connecting a newly-added diesel engine G2 and for connecting the relay bus 0LHT connected with the fifth diesel engine G1 and provide emergency power supply for any one of four emergency safety buses 1LHA/1LHB/2 LHB and four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ or two emergency safety buses (such as one of 1LHP/1LHQ and one of 2LHP/2 LHQ) which belong to different nuclear power generator sets and cannot have the power supply function when failing; it can be understood that the four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ are connected with corresponding safety emergency buses through a breaker trolley; the breaker trolleys are all movable trolleys with conductive performance so as to be convenient to operate;
the electric medium-voltage bus emergency power supply access device comprises six medium-voltage access handcarts P1/P2/P3/P4/P5/P6; wherein, the six medium-voltage access handcarts P1/P2/P3/P4/P5/P6 are all movable handcarts with conductive performance;
in the embodiment of the invention, if one of four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ is invalid, one of the two medium-voltage access handcarts is driven to connect the input ends of a newly-added diesel engine G2 and a medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the newly-added diesel engine G2 together, and the other one of the two medium-voltage access handcarts connects an emergency safety bus corresponding to the invalid emergency diesel generator set with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine G2 together, so that the newly-added diesel engine G2 is started and independently supplies power to the emergency safety bus corresponding to the invalid emergency diesel generator set through the medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the newly-added diesel engine G2; or
If one of the four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ is invalid, one of the four medium-voltage access handcarts is driven to connect the input ends of a fifth diesel engine G1 and a relay bus 0LHT correspondingly connected with the fifth diesel engine G1 together, two of the four emergency diesel generator sets are connected in series, the output end of the relay bus 0LHT connected with the fifth diesel engine G1 is connected with the input end of a medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 together, and the last emergency diesel engine set connects the output end of the medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 with the emergency safety bus corresponding to the invalid emergency diesel generator set together, so that the fifth diesel engine G1 independently supplies power to the emergency safety bus corresponding to the invalid emergency safety diesel generator set through the relay bus 0LHT correspondingly connected with the fifth diesel engine G1 and the medium-voltage bus 9LHT1 or 9LHT2 connected with the relay bus.
It should be noted that, because a single one of the four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ fails, only one of the four corresponding emergency safety buses 1LHA/1LHB/2LHA/2LHB cannot supply power, so that only one of the medium-voltage buses 9LHT1 or 9LHT2 is needed to access the fifth diesel engine G1 or the newly-added diesel engine G2, and the emergency safety bus which cannot supply power recovers normal power supply.
In one embodiment, if the emergency diesel generator set 1LHP fails, two medium-voltage access handcarts P1/P2 are selected from six medium-voltage access handcarts P1/P2/P3/P4/P5/P6, at the moment, the medium-voltage access handcarts P1/P2 are driven to connect the newly added diesel engine G2, the medium-voltage buses 9LHT1 correspondingly connected with the newly added diesel engine G2 and the emergency safety buses 1LHA corresponding to the failed emergency diesel generator set 1LHP together, and the newly added diesel engine G2 is enabled to independently supply power to the emergency safety buses 1LHA corresponding to the failed emergency diesel generator set 1LHP through the medium-voltage buses 9LHT1 correspondingly connected with the newly added diesel engine G2 after being started.
In another embodiment, if the emergency diesel generator set 1LHP fails, four intermediate-voltage access handcarts P3/P4/P5/P6 are selected from six intermediate-voltage access handcarts P1/P2/P3/P4/P5/P6, the fifth diesel engine G1 and the relay bus 0LHT correspondingly connected therewith, the intermediate-voltage bus 9LHT1 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 and the emergency safety bus 1LHA corresponding to the failed emergency diesel generator set 1LHP are connected together, and the fifth diesel engine G1 is started to independently supply power to the emergency safety bus 1LHA corresponding to the failed emergency diesel generator set 1LHP through the relay bus 0LHT correspondingly connected therewith and the intermediate-voltage bus 9LHT1 connected with the relay bus.
In the embodiment of the invention, if four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ have two failures belonging to different nuclear power generating sets, one of the two medium-voltage access handcarts is driven to connect the input end of a newly-added diesel engine G2 and a medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the newly-added diesel engine G2 together, and the other one of the two medium-voltage access handcarts connects an emergency safety bus corresponding to the failed emergency diesel generator set with the output end of a medium-voltage bus LHT1 or 9LHT2 correspondingly connected with the newly-added diesel engine G2 together, so that the newly-added diesel engine G2 is started to independently supply power to the emergency safety bus corresponding to the failed emergency diesel generator set through the medium-voltage bus 9LHT1 or 9LHT2 correspondingly connected with the newly-added diesel engine G2; and at the same time
And driving one of the other four medium-voltage access handcarts to connect the input ends of a fifth diesel engine G1 and a relay bus 0LHT correspondingly connected with the fifth diesel engine G1 together, connecting the output end of the relay bus 0LHT connected with the fifth diesel engine G1 with the input end of a medium-voltage bus 9LHT2 or 9LHT1 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 after the two medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus 9LHT2 or 9LHT1 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 with an emergency safety bus corresponding to the other emergency diesel generator set with failure together by the last medium-voltage access handcard, and independently supplying power to the emergency safety bus corresponding to the other emergency diesel generator set with failure through the relay bus 0LHT correspondingly connected with the fifth diesel engine G1 and the medium-voltage bus 9LHT2 or 9LHT1 connected with the relay bus.
It should be noted that, because two of the four emergency diesel generator sets 1LHP/1LHQ/2LHP/2LHQ belong to different nuclear power units and fail, one of the four corresponding emergency safety buses 1LHA/1LHB and one of the four corresponding emergency safety buses 2LHA/2LHB cannot supply power, at this time, two medium-voltage buses 9LHT1/9LHT2 are required to respectively obtain the access of the fifth diesel engine G1 and the newly-added diesel engine G2, it is ensured that the two medium-voltage buses 9LHT1/9LHT2 both have independent power access to enable the emergency safety buses which cannot supply power to recover normal power supply, mutual interference when the newly-added diesel engine G2 and the fifth diesel engine G1 are accessed is avoided, and the power supply functions of the two are considered.
In one embodiment, if the emergency diesel generator set 1LHP/2LHP fails, two medium-voltage access handcarts P1/P2 are selected to connect the newly added diesel engine G2, the medium-voltage bus 9LHT1 correspondingly connected with the newly added diesel engine G2 and the emergency safety bus 1LHA corresponding to the failed emergency diesel generator set 1LHP together, so that the newly added diesel engine G2 can independently supply power to the emergency safety bus 1LHA corresponding to the failed emergency diesel generator set 1LHP through the medium-voltage bus 9LHT1 correspondingly connected with the newly added diesel engine G2 after being started; and simultaneously selecting the remaining four medium-voltage access handcarts P3/P4/P5/P6, connecting the fifth diesel engine G1 and the relay bus 0LHT correspondingly connected with the fifth diesel engine G1, the medium-voltage bus 9LHT2 correspondingly connected with the relay bus 0LHT connected with the fifth diesel engine G1 and the emergency safety bus 2LHA corresponding to the other failed emergency diesel generator set 2LHP together, and independently supplying power to the emergency safety bus 2LHA corresponding to the other failed emergency diesel generator set 2LHP through the relay bus 0LHT correspondingly connected with the fifth diesel engine G1 and the medium-voltage bus 9LHT2 connected with the relay bus after the fifth diesel engine G1 is started.
As shown in fig. 4, in the embodiment of the present invention, the method for accessing an electrical medium-voltage bus to an emergency power supply is implemented on an electrical medium-voltage bus emergency power supply access device that includes six medium-voltage access handcarts and is used for three medium-voltage buses; one medium-voltage bus is a relay bus used for connecting a fifth diesel engine, and the other two medium-voltage buses are respectively used for connecting a newly-added diesel engine and the relay bus connected with the fifth diesel engine and providing emergency power supply for any one of four emergency safety buses and four emergency diesel generator sets or two emergency safety buses which fail and cannot have the power supply function and belong to different nuclear power generator sets; the method comprises the following steps:
s1, detecting the running states of four emergency diesel generator sets; wherein the operating state is normal or failure;
s2, if two of the four emergency diesel generating sets which belong to different nuclear power generating sets fail, one of the two medium-voltage access handcarts is driven to connect the input ends of a newly-added diesel engine and a medium-voltage bus correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generating set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generating set through the medium-voltage bus correspondingly connected with the newly-added diesel engine; and
and driving one of the other four medium-voltage access handcarts to connect the input ends of a fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, connecting the output end of the relay bus connected with the fifth diesel engine with the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together after two of the other four medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine with the emergency safety bus corresponding to the other failed emergency diesel generator set together by the last medium-voltage bus, and independently supplying power to the emergency safety bus corresponding to the other failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus after the fifth diesel engine is started.
Wherein the method further comprises the steps of:
if one of the four emergency diesel generator sets fails, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other one of the four emergency diesel generator sets connects the emergency safety buses corresponding to the failed emergency diesel generator set with the output ends of the medium-voltage buses correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety buses corresponding to the failed emergency diesel generator set through the medium-voltage buses correspondingly connected with the newly-added diesel engine.
Wherein the method further comprises the steps of:
if one of the four emergency diesel generator sets fails, one of the four medium-voltage access handcarts is driven to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, two of the four emergency diesel generator sets are connected in series and then connect the output end of the relay bus connected with the fifth diesel engine and the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together, and the last emergency diesel generator set connects the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine and the emergency safety bus corresponding to the failed emergency diesel generator set together, so that the fifth diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus.
The embodiment of the invention has the following beneficial effects:
1. the access of a newly-added diesel engine of the power plant is realized, a backup power supply is added for the unit, and the reliability of emergency power supply of the power plant can be effectively improved;
2. the invention provides an alternative power supply for the original EDG, so that the long-term overhaul/reconstruction of the EDG during the normal operation of the reactor becomes possible;
3. the invention realizes the replacement of '1 to N' of the newly added diesel engine, has flexible access and wide power supply coverage;
4. the invention avoids the mutual interference when the newly-added diesel engine and the fifth diesel engine are accessed, and gives consideration to the power supply functions of the newly-added diesel engine and the fifth diesel engine;
5. the invention does not additionally increase the occupied space of excessive equipment and does not need to adjust the existing factory buildings.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (9)
1. An electric medium voltage bus emergency power supply access device is characterized in that the access device is used on three medium voltage buses; one medium-voltage bus is a relay bus used for connecting a fifth diesel engine, and the other two medium-voltage buses are respectively used for connecting a newly-added diesel engine and the relay bus connected with the fifth diesel engine and providing emergency power supply for any one of four emergency safety buses and four emergency diesel generator sets or two emergency safety buses which fail and cannot have the power supply function and belong to different nuclear power generator sets;
the electric medium-voltage bus emergency power supply access device comprises six medium-voltage access handcarts;
if two of the four emergency diesel generating sets which belong to different nuclear power generating sets fail, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generating set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generating set through the medium-voltage bus correspondingly connected with the newly-added diesel engine; and
and driving one of the other four medium-voltage access handcarts to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, connecting the output end of the relay bus connected with the fifth diesel engine with the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together after two of the other four medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine with the emergency safety bus corresponding to the other failed emergency diesel generator set together by the last medium-voltage bus, and independently supplying power to the emergency safety bus corresponding to the other failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus after the fifth diesel engine is started.
2. The electrical medium-voltage bus emergency power supply access device of claim 1, wherein if one of the four emergency diesel generator sets fails, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly added diesel engine and the medium-voltage bus correspondingly connected thereto, and the other emergency safety bus corresponding to the failed emergency diesel generator set is connected with the output end of the medium-voltage bus correspondingly connected thereto, so that the newly added diesel engine is started to independently supply power to the emergency safety bus corresponding to the failed emergency diesel generator set through the medium-voltage bus correspondingly connected thereto.
3. The electrical medium-voltage bus emergency power supply access device of claim 1, wherein if one of the four emergency diesel generator sets fails, one of the four medium-voltage access handcarts is driven to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected thereto together, two of the four emergency diesel generator sets are connected in series, and then the output end of the relay bus connected to the fifth diesel engine is connected to the input end of the medium-voltage bus correspondingly connected to the relay bus connected to the fifth diesel engine, and finally the last emergency diesel generator set connects the output end of the medium-voltage bus correspondingly connected to the relay bus connected to the fifth diesel engine to the emergency safety bus corresponding to the failed emergency diesel generator set together, so that the fifth diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generator set through the relay bus correspondingly connected thereto and the medium-voltage bus connected to the relay bus.
4. An electrical medium voltage bus emergency power supply access device according to any of claims 1-3, characterized in that the six medium voltage access handcarts are all movable trolleys with conductive properties.
5. An electrical medium voltage bus emergency power supply access device as claimed in claim 1, wherein said four emergency diesel generator sets are connected to the respective safety emergency bus by a breaker trolley.
6. An electrical medium voltage bus emergency power access device according to claim 5, characterized in that said breaker trolleys are all movable trolleys with conductive properties.
7. An electric medium voltage bus emergency power supply access method is characterized in that the method is realized on an electric medium voltage bus emergency power supply access device which comprises six medium voltage access handcarts and is used for three medium voltage buses; one medium-voltage bus is a relay bus used for connecting a fifth diesel engine, and the other two medium-voltage buses are respectively used for connecting a newly-added diesel engine and the relay bus connected with the fifth diesel engine and providing emergency power supply for any one of four emergency safety buses and four emergency diesel generator sets or two emergency safety buses which fail and cannot have the power supply function and belong to different nuclear power generator sets; the method comprises the following steps:
detecting the running states of four emergency diesel generator sets; wherein the operating state is normal or failure;
if two of the four emergency diesel generating sets which belong to different nuclear power generating sets fail, one of the two medium-voltage access handcarts is driven to connect the input ends of a newly-added diesel engine and a medium-voltage bus correspondingly connected with the newly-added diesel engine together, and the other emergency safety bus corresponding to the failed emergency diesel generating set is connected with the output end of the medium-voltage bus correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generating set through the medium-voltage bus correspondingly connected with the newly-added diesel engine; and
and driving one of the other four medium-voltage access handcarts to connect the input ends of a fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, connecting the output end of the relay bus connected with the fifth diesel engine with the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together after two of the other four medium-voltage access handcarts are connected in series, connecting the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine with the emergency safety bus corresponding to the other failed emergency diesel generator set together by the last medium-voltage bus, and independently supplying power to the emergency safety bus corresponding to the other failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus after the fifth diesel engine is started.
8. The electrical medium voltage bus emergency power access method of claim 7, further comprising the step of:
if one of the four emergency diesel generator sets fails, one of the two medium-voltage access handcarts is driven to connect the input ends of the newly-added diesel engine and the medium-voltage buses correspondingly connected with the newly-added diesel engine together, and the other one of the four emergency diesel generator sets connects the emergency safety buses corresponding to the failed emergency diesel generator set with the output ends of the medium-voltage buses correspondingly connected with the newly-added diesel engine together, so that the newly-added diesel engine is started and then independently supplies power to the emergency safety buses corresponding to the failed emergency diesel generator set through the medium-voltage buses correspondingly connected with the newly-added diesel engine.
9. The electrical medium voltage bus emergency power access method of claim 7, further comprising the step of:
if one of the four emergency diesel generator sets fails, one of the four medium-voltage access handcarts is driven to connect the input ends of the fifth diesel engine and the relay buses correspondingly connected with the fifth diesel engine together, two of the four emergency diesel generator sets are connected in series and then connect the output end of the relay bus connected with the fifth diesel engine and the input end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine together, and the last emergency diesel generator set connects the output end of the medium-voltage bus correspondingly connected with the relay bus connected with the fifth diesel engine and the emergency safety bus corresponding to the failed emergency diesel generator set together, so that the fifth diesel engine is started and then independently supplies power to the emergency safety bus corresponding to the failed emergency diesel generator set through the relay bus correspondingly connected with the fifth diesel engine and the medium-voltage bus connected with the relay bus.
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| CN109494869A (en) * | 2018-11-29 | 2019-03-19 | 中广核研究院有限公司 | A kind of atomic-powered ship electric system |
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| JP2014098233A (en) * | 2012-11-13 | 2014-05-29 | Hitachi-Ge Nuclear Energy Ltd | Emergency electric power supply equipment and application method of the same |
| CN104052148A (en) * | 2014-06-25 | 2014-09-17 | 南京南瑞继保电气有限公司 | Automatic switching and automatic recovery method and device suitable for diesel generator |
| CN205725134U (en) * | 2016-04-29 | 2016-11-23 | 福建福清核电有限公司 | A kind of emergent portable power source system |
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