CN109167338B - Generator-transformer unit protection control method and device for nuclear power unit - Google Patents
Generator-transformer unit protection control method and device for nuclear power unit Download PDFInfo
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- CN109167338B CN109167338B CN201810934211.0A CN201810934211A CN109167338B CN 109167338 B CN109167338 B CN 109167338B CN 201810934211 A CN201810934211 A CN 201810934211A CN 109167338 B CN109167338 B CN 109167338B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
A generator-transformer protection control method and device for a nuclear power unit are disclosed, wherein on the first hand, a fault detection unit has the identification capability of a fault detection signal, so that the occurrence position or the fault type of a fault point can be rapidly judged; in the second aspect, as the logic determination unit selects corresponding trip logics for different faults, the fault control process of the generator-transformer unit is more clear and detailed, the situation of full stop of the generator-transformer unit in the past can be avoided when the trip logics for stopping the generator unit are adopted when the generator fails, and the external power grid can be facilitated to continuously supply power to equipment in a plant through a main transformer; in the third aspect, the logic determination unit adopts the trip logic of full stop when the main transformer, the plant transformer, the transmission bus and/or the switch have faults, so that the system can cut off the electric connection between the generator and the transformer in time, the generator can be effectively prevented from continuously transmitting power to the fault point, and the safe operation of the generator-transformer set is ensured.
Description
Technical Field
The invention relates to a million kilowatt nuclear power generation technology, in particular to a power generation and transformation set protection control method and device for a nuclear power unit.
Background
Nuclear power generation is an important new energy power generation technology, chemical energy of fossil fuel is replaced by nuclear fission energy, a boiler for thermal power generation is replaced by a nuclear reactor and a steam generator, and a steam turbine is driven by steam to generate power. Currently, a nuclear power generating unit mainly includes a nuclear reactor, a steam generator, a steam turbine, a generator, a transformer and related control equipment, wherein the generator, the transformer and a related generator-transformer unit protection control system (GPA for short) play an important role in safety and stability of power output of the nuclear power generating unit.
At present, a generator-transformer group protection system (GPA) is often used for controlling switches arranged at the front end or the rear end of a generator and a transformer, when the situations of generator faults, transformer faults, transmission bus faults, self faults of the switches and the like occur, the generator-transformer group protection control system controls the corresponding switches to be switched off according to self control logic, so that actions such as outlet complete stop, shutdown group, disconnection or program stop are completed, fault points can be timely isolated when faults occur, and safe operation of other equipment of a nuclear power generating unit is protected.
The conventional generator outlet load switch can only cut off the current below 30kA and cannot form the bearing capacity for larger current, the risk of damage to the generator outlet load switch caused by the large current due to faults such as three-phase short circuit at the outlet of the generator exists, and the problem of complete stop of the generator unit due to damage of the generator outlet load switch can be caused under severe conditions, so that the stable operation of a nuclear power unit in a nuclear power station is not facilitated.
In addition, the control logic of the conventional generator-transformer group protection control system (GPA) is relatively single, for example, when a relevant fault of an outlet complete stop (such as a fault of a main transformer, a plant transformer or a transmission bus) is planned, the GPA can only control a steam turbine to trip, a field suppression switch of a generator to trip and a high-voltage switch on the transmission bus to trip before controlling an outlet load switch of the generator to trip, so that the generator is connected with the main transformer and the plant transformer for a short time and still provides current for a fault point, and certain unsafe factors exist in the protection control process. For another example, when a fault related to the shutdown of the export power plant is planned (such as low-frequency second-stage, low-voltage second-stage, and extra-high-voltage switch jump), the GPA needs to disconnect the export load switch of the generator after the turbine trips and operates forward at low power, which also causes the generator to be still connected with the main transformer or the plant transformer within a short time, and is not favorable for immediately disconnecting the line to isolate the fault point. For example, when an internal fault of the generator is planned, the GPA may execute operations of the fully-stopped main transformer and the fully-stopped unit according to the control logic, which directly results in an embarrassment that the plant transformer has no power supply, cannot ensure a normal power supply requirement in the nuclear power plant, and is not favorable for meeting a trip and power failure requirement in a small range.
Disclosure of Invention
The invention mainly solves the technical problem of how to quickly remove the connection relation between a generator and an external power grid and an internal power grid when a generator-transformer unit fails so as to enhance the reliability and flexibility of the operation of a nuclear power unit. In order to solve the technical problem, the application provides a generator-transformer unit protection control method and device for a nuclear power unit.
According to a first aspect, an embodiment provides a generator-transformer unit protection control method for a nuclear power generating unit, including the following steps:
acquiring a fault detection signal;
judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal;
determining a tripping logic according to the occurrence position and/or the fault type of the fault in the generator-transformer group;
and controlling the trip state of the corresponding switch in the generator-transformer group according to the trip logic.
The hair-transformer group comprises: the system comprises a steam turbine, a corresponding stop valve, a generator, a corresponding de-excitation switch, a main transformer, a plant transformer, a GCB switch on an outlet bus and a high-voltage side switch on a transmission bus, wherein the main transformer and the plant transformer are connected with the generator through the outlet bus;
the fault detection signals of the generator-transformer set comprise one or more of generator fault detection signals, main transformer fault detection signals, plant transformer fault detection signals, transmission bus fault detection signals and switch self fault detection signals.
The judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal comprises the following steps:
if a generator fault detection signal is detected, judging that the generator in the generator-transformer set has faults, including inter-phase turn-to-turn short circuit faults, stator ground faults, overload faults, step-out faults, field loss faults, reverse power faults, frequency faults and voltage faults;
if a main transformer fault detection signal is detected, judging that a main transformer in the power generation and transformation set has faults, including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults;
if a fault detection signal of the plant transformer is detected, judging that the plant transformer in the generator-transformer set has faults, including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults;
if a transmission bus fault detection signal is detected, judging that the transmission bus in the generator-transformer set has faults, including an overcurrent fault, an interphase short-circuit fault and a ground fault;
and if the fault detection signal of the switch is detected, judging that the corresponding switch in the generator-transformer group has faults, including failure faults.
The determining of the trip logic according to the occurrence position and/or the fault type of the fault in the generator-transformer group comprises the following steps:
if the generator in the generator-transformer set fails, determining a tripping logic of a shutdown set, wherein the tripping logic of the shutdown set is used for enabling the generator in the generator-transformer set to be disconnected with a main transformer and a plant transformer;
and if the main transformer, the plant transformer, the transmission bus and/or the switch in the power generation and transformation group have faults, determining a full-stop tripping logic, wherein the full-stop tripping logic is used for enabling the generator, the main transformer, the plant transformer and the transmission bus in the power generation and transformation group to be disconnected.
The controlling the trip state of the corresponding switch in the generator-transformer group according to the trip logic comprises:
when the generator and/or the transmission bus in the generator-transformer set have faults, a shutdown valve of a steam turbine in the nuclear power unit, a field suppression switch of the generator and a GCB switch are controlled to trip according to the trip logic of the shutdown unit, so that circuit break is generated among the generator in the generator-transformer set, a main transformer and a plant transformer;
when the main transformer, the plant transformer and/or the switch in the generating and transforming set have faults, the shutdown valve of the steam turbine, the field suppression switch and the GCB switch of the generator and the high-voltage side switch on the transmission bus are controlled to trip according to the trip logic of the full shutdown, so that the generator, the main transformer, the plant transformer and the transmission bus in the generating and transforming set are disconnected.
According to a second aspect, an embodiment provides a generator-transformer group protection control device, comprising:
a fault detection unit for acquiring a fault detection signal;
the fault judging unit is used for judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal;
the logic determination unit is used for determining a tripping logic according to the occurrence position and/or the fault type of the fault in the generator-transformer set;
and the trip control unit is used for controlling the trip state of each switch in the generator-transformer group according to the trip logic.
The fault detection signals detected by the fault detection unit comprise one or more of generator fault detection signals, main transformer fault detection signals, plant transformer fault detection signals, transmission bus fault detection signals and switch self fault detection signals.
The failure determination unit includes:
the first judgment module is used for judging that the generator in the generator-transformer set has faults when a generator fault detection signal is detected, wherein the faults comprise an interphase turn-to-turn short circuit fault, a stator grounding fault, an overload fault, a step-out fault, a field loss fault, a reverse power fault, a frequency fault and a voltage fault;
the second judgment module is used for judging that the main transformer in the power generation and transformation set has faults including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults when a main transformer fault detection signal is detected;
the third judgment module is used for judging that the plant transformer in the power generation and transformation group has faults including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults when a fault detection signal of the plant transformer is detected;
the fourth judging module is used for judging that the transmission buses in the generator-transformer set have faults including overcurrent faults, interphase short-circuit faults and grounding faults when the transmission bus fault detection signal is detected;
and the fifth judging module is used for judging that the corresponding switch in the generator-transformer set has faults including failure faults when the fault detection signal of the switch is detected.
The logic determination unit includes:
the system comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining the tripping logic of a shutdown unit when the generator in the generator-transformer group fails so as to generate circuit break between the generator in the generator-transformer group and a main transformer and a plant transformer;
and the second determination module is used for determining the trip logic of the full stop when the main transformer, the plant transformer, the transmission bus and/or the switch in the power generation and transformation group have faults so as to generate circuit break among the generator, the main transformer, the plant transformer and the transmission bus in the power generation and transformation group.
According to a third aspect, an embodiment provides a nuclear power generating unit comprising:
the system comprises a power generation and transformation group, a power generation and transformation group and a control system, wherein the power generation and transformation group comprises a steam turbine, a corresponding shutdown valve, a power generator, a corresponding demagnetization switch, a main transformer, a plant transformer and a GCB switch on an outlet bus, which are connected with the power generator through the outlet bus, and a high-voltage side switch on a power transmission bus, which is connected with the main transformer;
the generator-transformer set protection control device according to the second aspect.
The beneficial effect of this application is:
according to the power generation and transformation group protection control method and device for the nuclear power generating unit, a fault detection unit for obtaining a fault detection signal, a fault judgment unit for judging a fault, a logic determination unit for determining trip logic and a trip control unit for controlling the trip state of the power generation and transformation group are obtained. On the first hand, the fault detection unit has the capability of identifying and judging fault detection signals, so that the occurrence position or the fault type of a fault point can be quickly judged; in the second aspect, as the logic determination unit selects corresponding trip logics for different faults, the fault control process of the generator-transformer unit is more detailed, and the trip logics for stopping the generator unit are adopted when the generator fails, so that the conventional situation that the generator-transformer unit is completely stopped is avoided, and an external power grid is facilitated to continuously supply power to equipment in a plant through a main transformer; in the third aspect, the logic determination unit adopts the trip logic of full stop when the main transformer, the plant transformer, the transmission bus and/or the switch have faults, so that the system can cut off the electrical connection between the generator and the transformer in time, the generator can be effectively prevented from continuously transmitting power to the fault point, and the safe operation of the generator-transformer unit is ensured. In addition, the load switch at the outlet of the generator is replaced by a novel GCB switch with larger breaking current capacity from an original old switch, so that a better cutting-off effect is achieved between the generator and the transformer, and the control in the embodiment is facilitated.
Drawings
FIG. 1 is a structural diagram of a generator-transformer unit in a nuclear power unit;
FIG. 2 is a block diagram of a generator-transformer unit protection control device;
FIG. 3 is a flow chart of a generator-transformer group protection control method;
fig. 4 is a flow chart of fault determination and trip logic determination.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, the present application discloses a nuclear power generating unit, which includes a generator-transformer group and a generator-transformer group protection control device. The generator-transformer group comprises a steam turbine 11 and a corresponding shutdown valve 110, a generator 12 and a corresponding de-excitation switch 120, a main transformer 14 connected with the generator 12 through an outlet bus, a plant transformer 15, a GCB switch 13 on the outlet bus, a transmission bus 16 connected with the main transformer 14, and a high-voltage side switch 160 on the transmission bus 16.
It should be noted that the stop valve 110 of the steam turbine 11 often includes a plurality of control valves with different functions, such as a steam turbine emergency stop valve (suitable for emergency trip stop), a steam turbine stop valve (the steam turbine stop valve typically includes 4 high pressure stop valves and 6 low pressure stop valves); when the shutdown valve 110 is tripped, the turbine 11 stops operating. The field suppression switch 120 of the generator 12 is one of the main control components of the generator, and is used for rapidly reducing the current in the excitation loop; when the demagnetization switch 120 trips, the generator 120 stops operating.
It should be noted that the GCB switch 13 is disposed at the outlet of the generator 12, and is used for forming a disconnectable connection mode with the main transformer 14; when the GCB switch 13 trips, the outlet line of the generator 12 is cut off. The GCB switch (Generator Circuit-Breaker, short for generator outlet Breaker) is generally suitable for various large-scale power plants such as nuclear power, thermal power, hydroelectric power and the like, uses SF6 medium to extinguish arc, has mature technology and reliable performance, and can reach the maximum breaking current of hundreds of kA. In this embodiment, the breaking fault short-circuit current of the GCB switch 13 used can reach 190kA, and the maximum short-circuit current of the three-phase short circuit at the outlet of the generator is often 137.4kA, so that the GCB switch 13 can effectively break the current on the outlet bus of the generator, and can be suitable for the line breaking requirements under the condition of most faults in the generator-transformer set.
It should be noted that the main transformer 14 is disposed on a line for transmitting power to an external public power grid, and is mainly used for converting the electric energy output by the generator 12 into electric energy suitable for the requirements of the external public power grid. The number of the plant transformers 15 may be plural, and the plant transformers respectively supply power to different electric devices in the nuclear power plant, and are mainly used for converting the electric energy output by the generator 12 into electric energy suitable for the requirements of the internal electric devices.
The power transmission bus 16 is used for connection to an external public power grid, and a plurality of high-voltage side switches 160 provided on the line are often provided for controlling the disconnection of each line of the power transmission bus 16, and for example, the power transmission bus 16 is controlled by using two main-substation high-voltage side circuit breakers.
The generator-transformer group protection control device 10 is connected to the generator 12, the GCB switch 13, the main transformer 14, the plant transformer 15, and the transmission bus 16, and is configured to receive fault detection signals of all fault measurement devices. In addition, the generator-transformer protection control device 10 is connected to the shutdown valve 110, the demagnetization switch 120, the GCB switch 13, and the high-voltage side switch 160, respectively, for controlling the trip states of these switches.
Accordingly, referring to fig. 2, the present application discloses a generator-transformer-group protection control device 10, which includes a fault detection unit 101, a fault judgment unit 102, a logic determination unit 103, and a trip control unit 104, which are respectively described below.
The fault detection unit 101 is in signal connection with a fault measurement device of the generator 12, a fault measurement device of the GCB switch 13, a fault measurement device of the main transformer 14, a fault measurement device of the plant transformer 15, and a fault measurement device of the transmission bus 16, and is configured to obtain fault detection signals of the fault measurement devices. In an embodiment, the fault detection signals detected by the fault detection unit 101 include one or more of a generator fault detection signal, a main transformer fault detection signal, a plant transformer fault detection signal, a transmission bus fault detection signal, and a switch self fault detection signal.
The fault determining unit 102 is connected to the fault detecting unit 101, and is configured to determine an occurrence location and/or a fault type of a fault in the generator/transformer set according to the fault detection signal. In an embodiment, the fault determining unit 102 includes a first determining module 1021, a second determining module 1022, a third determining module 1023, a fourth determining module 1024, and a fifth determining module 1025, where the first determining module 1021 is configured to determine that the generator 11 in the generator-transformer set fails when detecting a generator fault detection signal, and the fault types include an inter-phase inter-turn short-circuit fault, a stator ground fault, an overload fault, an out-of-step fault, an out-of-field fault, a reverse power fault, a frequency fault, and a voltage fault; the second determining module 1022 is configured to determine that the main transformer 14 in the power generation and transformation group has a fault when a main transformer fault detection signal is detected, where the fault types include an overvoltage overcurrent fault, an abnormal ground fault, an interphase short-circuit fault, and a heavy gas fault; the third judging module 1023 is used for judging that the plant transformer 15 in the generator-transformer set has a fault when a fault detection signal of the plant transformer is detected, wherein the fault types comprise an overvoltage overcurrent fault, an abnormal ground fault, an interphase short circuit fault and a heavy gas fault; the fourth judging module 1024 is configured to judge that a transmission bus in the generator-transformer set fails when a transmission bus fault detection signal is detected, where the fault types include an overcurrent fault, an interphase short-circuit fault, and a ground fault; the fifth determining module 1025 is configured to determine that the corresponding switch in the generator set is faulty (preferably, the self-fault detection signal of the GCB switch is detected and whether it is faulty) when the self-fault detection signal of the switch is detected, and the type of fault includes a failure fault. In another embodiment, the fault detection unit 101 can also detect a fault detection signal of the outlet bus of the generator 12, so that the fourth determination module 1024 can also determine that the outlet bus in the generator set is faulty when the fault detection signal of the outlet bus is detected.
The logic determination unit 103 is connected to the fault judgment unit 102, and is configured to determine a trip logic according to an occurrence location and/or a fault type of a fault in the generator-transformer set. In an embodiment, the logic determination unit 103 includes a first determination module 1031 and a second determination module 1032, where the first determination module 1031 is configured to determine a trip logic for stopping the generator set when the generator 11 in the generator/transformer set fails, so as to cause an open circuit between the generator in the generator/transformer set and the main and plant transformers, i.e. disconnect the outlet bus of the generator; the second determination module 1032 is configured to determine a trip logic of the full stop when a main transformer 14, a plant transformer 15, a transmission bus 16 and/or a GCB switch 13 in the power generation group fails, so as to generate an open circuit among the generators 11, the main transformer 14, the plant transformer 15 and the transmission bus 16 in the power generation group.
The trip control unit 104 is connected to the logic determination unit 103 for controlling the trip state of the individual switches in the generator set according to the trip logic. In one embodiment, the trip control unit 104 is in signal communication with the shutdown valve 110, the demagnetization switch 120, the GCB switch 13, and the high side switch 160, respectively, and controls the trip state of the switches, respectively.
Correspondingly, referring to fig. 3, the application discloses a generator-transformer group protection control method for a nuclear power generating unit, which includes steps S210-S240, and the generator-transformer group protection control method is respectively described below with reference to the technical solutions shown in fig. 1 and fig. 2.
Step S210, a fault detection signal is acquired. In an embodiment, the fault detection unit 11 obtains the fault detection signals from the fault measurement device of the generator 12, the fault measurement device of the GCB switch 13, the fault measurement device of the main transformer 14, the fault measurement device of the plant transformer 15, and the fault measurement device of the transmission bus 16, and then the fault detection signals of the power generation and transformation group include one or more of a generator fault detection signal, a main transformer fault detection signal, a plant transformer fault detection signal, a transmission bus fault detection signal, and a switch own fault detection signal.
And step S220, judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal. In one embodiment, the step S220 may include steps S221-S226, respectively, as described below.
In step S221, when the first determining module 1021 in the failure determining unit 102 detects the generator failure detection signal, it determines that the generator 11 in the generator/transformer set has a failure, and then the process goes to step S231, otherwise, the process goes to step S222. The fault types of the generator comprise an interphase turn-to-turn short circuit fault, a stator ground fault, an overload fault, a step-out fault, a magnetic loss fault, a reverse power fault, a frequency fault and a voltage fault.
In step S222, when the second determining module 1022 in the fault determining unit 102 detects the main transformer fault detection signal, it determines that the main transformer 14 in the power generation and transformation group is faulty, and then the process goes to step S232, otherwise, the process goes to step S223. The fault types of the main transformer comprise overvoltage and overcurrent faults, abnormal grounding faults, interphase short-circuit faults and heavy gas faults.
In step S223, when the third determining module 1023 in the fault determining unit 102 detects the fault detection signal of the plant transformer, it determines that the plant transformer 15 in the generator-transformer set has a fault, and then the process goes to step S232, otherwise, the process goes to step S224. The fault types of the factory transformer comprise overvoltage overcurrent faults, abnormal ground faults, interphase short-circuit faults and heavy gas faults.
In step S224, when the fourth determination module 1024 in the fault determination unit 102 detects the transmission bus fault detection signal, it determines that the transmission bus in the generator/transformer set has a fault, and the process goes to step S232, otherwise, the process goes to step S225. The fault types of the power transmission bus comprise overcurrent faults, interphase short-circuit faults and grounding faults;
in another embodiment, the fourth fault module 1024 may further detect a fault detection signal of the outlet bus of the generator 12, and when the outlet bus is determined to be faulty, the step S232 is performed. The fault types of the outlet bus comprise overcurrent fault, interphase short-circuit fault and grounding fault.
In step S225, the fifth determining module 1025 in the failure determining unit 102 determines that the corresponding switch in the generator set has failed (preferably detects the self-failure detection signal of the GCB switch and determines whether it has failed) when detecting the self-failure detection signal of the switch, and then proceeds to step S232, otherwise, to step S226. The type of failure of the switch includes a malfunction failure.
In step S226, it is determined that the generator set is not faulty.
It should be noted that the order of the determination in steps S221 to S225 is adjustable, and this embodiment is not limited.
In a specific embodiment, the occurrence location and the type of the fault can be known from the following table 1
TABLE 1 Generation and transformation group Fault List
It should be noted that the type of fault of the plant transformer 15 is the same as that of the main transformer 14, and is not listed here.
And step S230, determining a tripping logic according to the occurrence position and/or the fault type of the fault in the generator-transformer group. In one embodiment, see FIG. 4, the step S230 may include steps S231-S232, which are described below.
In step S231, the first determination module 1031 in the logic determination unit 103 determines the trip logic of the shutdown unit, where the trip logic of the shutdown unit is used to generate an open circuit between the generator 11 in the generator-transformer set and the main transformer 14 and the plant transformer 15.
In step S232, the second determination module 1021 in the logic determination unit 103 determines the trip logic of the full stop, where the trip logic of the full stop is used to generate the open circuit among the generator 11, the main transformer 14, the plant transformer 15 and the transmission bus 16 in the generator-transformer group.
And step S240, controlling the trip state of the corresponding switch in the power generation and transformation group according to the trip logic. In a specific embodiment, when the first determining module 1031 determines the trip logic of the shutdown unit, that is, when the generator 11 in the generator-transformer group has a fault, the shutdown valve 110 of the steam turbine in the nuclear power plant, the demagnetization switch 120 of the generator, and the GCB switch 13 are controlled to trip according to the trip logic of the shutdown unit, so as to disconnect the outlet bus of the generator, so that an open circuit is generated between the generator 11 in the generator-transformer group and the main transformer 14 and the plant transformer 15; when the second determination module 1032 determines the trip logic of the full stop, that is, the main transformer 14, the plant transformer 15, the transmission bus 16 and/or the GCB switch 13 in the generator set are/is failed, the shutdown valve 110 of the steam turbine, the field suppression switch 120 and the GCB switch 13 of the generator and the high-voltage side switch 160 on the transmission bus are controlled to trip according to the trip logic of the full stop, so that a circuit break is generated among the generator 11, the main transformer 14, the plant transformer 15 and the transmission bus 16 in the generator set.
It will be understood by those skilled in the art that the trip logic for the shutdown group and the full shutdown listed in step S230 is an insurance trip practice, but in some embodiments, in the case that the fault type of the fault point is not serious and can be recovered, the logic determination unit 103 may form other trip logic in a local scope, for example, when the main transformer 14 has a fault of slide pole (step loss) or main transformer overrun, the generator 11 will not be seriously damaged, and the logic determination unit 103 may form the trip logic for the shutdown bus to control the trip of the high-voltage side switch 160 on the transmission bus, so as to eliminate the fault and avoid unstable nuclear power production caused by large-scale trip.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (6)
1. A generator-transformer unit protection control method for a nuclear power unit is characterized by comprising the following steps:
acquiring a fault detection signal; the fault detection signals of the generator-transformer set comprise one or more of generator fault detection signals, main transformer fault detection signals, plant transformer fault detection signals, transmission bus fault detection signals and switch self fault detection signals;
judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal; the generator-transformer group comprises a steam turbine, a corresponding stop valve, a generator, a corresponding de-excitation switch, a main transformer, a plant transformer, a GCB switch on an outlet bus and a high-voltage side switch, wherein the main transformer, the plant transformer and the GCB switch are connected with the generator through the outlet bus;
determining a trip logic according to the occurrence position and/or the fault type of the fault in the generator-transformer group, wherein the trip logic comprises the following steps: if the generator in the generator-transformer set fails, determining a tripping logic of a shutdown set, wherein the tripping logic of the shutdown set is used for enabling the generator in the generator-transformer set to be disconnected with a main transformer and a plant transformer; if the main transformer, the plant transformer, the transmission bus and/or the switch in the generator-transformer set have faults, determining a trip logic of full stop, wherein the trip logic of full stop is used for enabling the generator, the main transformer, the plant transformer and the transmission bus in the generator-transformer set to be disconnected;
controlling the trip state of the corresponding switch in the generator-transformer group according to the trip logic, comprising: when the generator in the generator-transformer set breaks down, a shutdown valve of a steam turbine in the nuclear power unit, a field-suppression switch of the generator and a GCB switch are controlled to trip according to the trip logic of the shutdown unit, so that circuit break is generated among the generator in the generator-transformer set, a main transformer and a plant transformer; when the main transformer, the plant transformer, the transmission bus and/or the switch in the generator-transformer set have faults, the shutdown valve of the steam turbine, the field suppression switch of the generator, the GCB switch and the high-voltage side switch on the transmission bus are controlled to trip according to the trip logic of full shutdown, so that the generator, the main transformer, the plant transformer and the transmission bus in the generator-transformer set are disconnected.
2. The generator-transformer group protection control method according to claim 1, wherein the determining the occurrence position and/or the fault type of the fault in the generator-transformer group according to the fault detection signal comprises:
if a generator fault detection signal is detected, judging that the generator in the generator-transformer set has faults, including inter-phase turn-to-turn short circuit faults, stator ground faults, overload faults, step-out faults, field loss faults, reverse power faults, frequency faults and voltage faults;
if a main transformer fault detection signal is detected, judging that a main transformer in the power generation and transformation set has faults, including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults;
if a fault detection signal of the plant transformer is detected, judging that the plant transformer in the generator-transformer set has faults, including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults;
if a transmission bus fault detection signal is detected, judging that the transmission bus in the generator-transformer set has faults, including an overcurrent fault, an interphase short-circuit fault and a ground fault;
and if the fault detection signal of the switch is detected, judging that the corresponding switch in the generator-transformer group has faults, including failure faults.
3. A generator-transformer set protection control device is characterized by comprising:
a fault detection unit for acquiring a fault detection signal; the fault detection signals detected by the fault detection unit comprise one or more of generator fault detection signals, main transformer fault detection signals, plant transformer fault detection signals, transmission bus fault detection signals and switch self fault detection signals;
the fault judging unit is used for judging the occurrence position and/or the fault type of the fault in the generator-transformer set according to the fault detection signal; the generator-transformer group comprises a steam turbine, a corresponding stop valve, a generator, a corresponding de-excitation switch, a main transformer, a plant transformer, a GCB switch on an outlet bus and a high-voltage side switch, wherein the main transformer, the plant transformer and the GCB switch are connected with the generator through the outlet bus;
the logic determination unit is used for determining a tripping logic according to the occurrence position and/or the fault type of the fault in the generator-transformer set; if the generator in the generator-transformer set fails, the logic determination unit determines a tripping logic of a shutdown set, and the tripping logic of the shutdown set is used for enabling the generator in the generator-transformer set to be disconnected with a main transformer and a plant transformer; if the main transformer, the plant transformer, the transmission bus and/or the switch in the generator-transformer set have faults, the logic determination unit determines a trip logic of full stop, and the trip logic of full stop is used for enabling a circuit break to be generated among the generator, the main transformer, the plant transformer and the transmission bus in the generator-transformer set;
the tripping control unit is used for controlling the tripping state of each switch in the generator-transformer group according to the tripping logic; when the generator in the generator-transformer set breaks down, the tripping control unit controls a shutdown valve of a steam turbine in the nuclear power unit, a field suppression switch of the generator and a GCB switch to trip according to tripping logic of the shutdown unit, so that circuit break is generated among the generator in the generator-transformer set, a main transformer and a plant transformer; when the main transformer, the plant transformer, the transmission bus and/or the switch in the generator-transformer set have faults, the tripping control unit controls the shutdown valve of the steam turbine, the field suppression switch and the GCB switch of the generator and the high-voltage side switch on the transmission bus to trip according to the tripping logic of the full shutdown, so that the generator, the main transformer, the plant transformer and the transmission bus in the generator-transformer set are disconnected.
4. The generator-transformer group protection control device of claim 3, wherein the failure determination unit comprises:
the first judgment module is used for judging that the generator in the generator-transformer set has faults when a generator fault detection signal is detected, wherein the faults comprise an interphase turn-to-turn short circuit fault, a stator grounding fault, an overload fault, a step-out fault, a field loss fault, a reverse power fault, a frequency fault and a voltage fault;
the second judgment module is used for judging that the main transformer in the power generation and transformation set has faults including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults when a main transformer fault detection signal is detected;
the third judgment module is used for judging that the plant transformer in the power generation and transformation group has faults including overvoltage and overcurrent faults, abnormal ground faults, interphase short circuit faults and heavy gas faults when a fault detection signal of the plant transformer is detected;
the fourth judging module is used for judging that the transmission buses in the generator-transformer set have faults including overcurrent faults, interphase short-circuit faults and grounding faults when the transmission bus fault detection signal is detected;
and the fifth judging module is used for judging that the corresponding switch in the generator-transformer set has faults including failure faults when the fault detection signal of the switch is detected.
5. The generator-transformer group protection control device of claim 4, wherein the logic determination unit comprises:
the system comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining the tripping logic of a shutdown unit when the generator in the generator-transformer group fails so as to generate circuit break between the generator in the generator-transformer group and a main transformer and a plant transformer;
and the second determination module is used for determining the trip logic of the full stop when the main transformer, the plant transformer, the transmission bus and/or the switch in the power generation and transformation group have faults so as to generate circuit break among the generator, the main transformer, the plant transformer and the transmission bus in the power generation and transformation group.
6. A nuclear power generating unit, comprising:
the system comprises a power generation and transformation group, a power generation and transformation group and a control system, wherein the power generation and transformation group comprises a steam turbine, a corresponding shutdown valve, a power generator, a corresponding demagnetization switch, a main transformer, a plant transformer and a GCB switch on an outlet bus, which are connected with the power generator through the outlet bus, and a high-voltage side switch on a power transmission bus, which is connected with the main transformer;
the hair-change group protection and control device of any one of claims 3 to 5.
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| CN113725822A (en) * | 2020-05-26 | 2021-11-30 | 新特能源股份有限公司 | Method and system for removing fault of 220kV bus |
| CN114035497A (en) * | 2021-10-26 | 2022-02-11 | 江西五十铃汽车有限公司 | Emergency switching control method suitable for finish paint drying furnace of automobile coating plant |
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Non-Patent Citations (1)
| Title |
|---|
| WFB-100微机保护在秦山第二核电厂的应用;查卫华等;《继电器》;20030615;第31卷(第6期);73-77 * |
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