CN114157012A - Automatic unloading and loading system and method for nuclear power plant - Google Patents
Automatic unloading and loading system and method for nuclear power plant Download PDFInfo
- Publication number
- CN114157012A CN114157012A CN202111264630.6A CN202111264630A CN114157012A CN 114157012 A CN114157012 A CN 114157012A CN 202111264630 A CN202111264630 A CN 202111264630A CN 114157012 A CN114157012 A CN 114157012A
- Authority
- CN
- China
- Prior art keywords
- sbo
- emergency
- diesel engine
- switch group
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
-
- 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
- H02J9/002—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which a reserve is maintained in an energy source by disconnecting non-critical loads, e.g. maintaining a reserve of charge in a vehicle battery for starting an engine
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
-
- 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
Abstract
The invention relates to an automatic unloading and loading system and method for a nuclear power plant, which are applied to the SBO working condition of the nuclear power plant, wherein the system comprises an SBO diesel engine, an SBO power supply bus, an SBO emergency load bus, a safety level emergency power supply bus and a plurality of switch groups; under the SBO working condition, the system supplies power to SBO emergency load equipment of the nuclear power plant, and the SBO emergency load equipment is mounted on an SBO emergency load bus; the SBO diesel engine is connected with the SBO power supply bus, and the SBO power supply bus, the SBO emergency load bus and the safety level emergency power supply bus are respectively electrically connected with the emergency diesel engine and the plant service of the nuclear power plant through a plurality of switch groups. The automatic unloading and loading method for the nuclear power plant is applied to the automatic unloading and loading system for the nuclear power plant. The invention can effectively reduce the workload of operators under the SBO working condition and reduce the misoperation risk; the reliability of the SBO power supply can be greatly improved, an effective power supply can be timely provided for a safety system after an accident, and the safety of the nuclear power station is improved; the equipment and maintenance cost of the SBO diesel engine is reduced.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to an automatic unloading and loading system and method for a nuclear power plant.
Background
The existing nuclear power station SBO diesel engine needs manual operation in unloading and loading, the design considers that the whole plant power-off working condition does not interfere 30 minutes after the power-off working condition occurs, and a single SBO DG only carries a single-row device. When the whole plant power-off working condition occurs, the ambient temperature of a related electrical instrument equipment room and a main control room rises due to the loss of heating and ventilation equipment, particularly for compact small-sized piles such as an offshore nuclear power platform, the temperature rise rate is high under a constant heat source due to small room space, when the SBO load is unloaded in a manual mode after the whole plant power-off working condition occurs for 30 minutes, the cabin ambient temperature is too high due to untimely starting of the heating and ventilation equipment, the requirement of the main control room on the residency or the acceptable limit operating temperature of the electrical instrument equipment cannot be met, the whole accident treatment is influenced, and the safety of a reactor is influenced.
The prior art mainly has the following defects:
1. in the prior art, the SBO DG input needs manual intervention, the requirements on the knowledge level, the judgment level and the state of an operator are high, and if an emergency occurs, the SBO DG input is easy to fail due to human error operation;
2. in the prior art, the SBO DG input automation degree is low, the automatic control requirement of 'human non-intervention in 30 minutes' after an accident occurs cannot be met, and the requirement on the design margin of a safety system is high;
3. the existing design is that a single SBO DG is provided with a single-row emergency power supply bus, and the equipment cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an automatic unloading and loading system and method for a nuclear power plant, which can effectively reduce the workload of operators under the SBO working condition, effectively avoid human risks and improve the reliability and safety, aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method comprises the steps that an automatic unloading and loading system of the nuclear power plant is constructed and applied to the SBO working condition of the nuclear power plant, and the automatic unloading and loading system of the nuclear power plant comprises an SBO diesel engine, an SBO power supply bus, an SBO emergency load bus, a safety level emergency power supply bus and a plurality of switch groups; under the SBO working condition, the system automatically unloads and loads SBO emergency load equipment of the nuclear power plant, and the SBO emergency load equipment is mounted on the SBO emergency load bus;
the SBO diesel engine is connected with the SBO power supply bus, and an SBO diesel engine power output switch is arranged between the SBO diesel engine and the SBO power supply bus; the SBO power supply bus, the SBO emergency load bus and the safety level emergency power supply bus are electrically connected with an emergency diesel engine and a plant of a nuclear power plant through a plurality of switch groups.
Preferably, the automatic unloading and loading system of the nuclear power plant is divided into a line A and a line B which are redundant with each other, and the line A and the line B both comprise the SBO emergency load bus, the safety level emergency power supply bus, the emergency diesel engine and a plurality of switch groups;
the second end of the column A and the second end of the column B are respectively connected to the SBO power supply bus and are supplied with power by the SBO power supply bus; the first end of the column A and the first end of the column B are both connected to the emergency diesel engine and the service power of the nuclear power plant.
Preferably, the plurality of switch groups includes a first switch group, a second switch group, a third switch group, a fourth switch group and a fifth switch group;
the first switch group is arranged between the station power and the safety level emergency power supply bus, the second switch group is arranged between the emergency diesel engine and the safety level emergency power supply bus, the third switch group is arranged between the safety level emergency power supply bus and the SBO emergency load bus, and the fourth switch group and the fifth switch group are arranged between the SBO emergency load bus and the SBO power supply bus.
Preferably, a first end of the first switch group is connected to the service power, and a second end of the first switch group is connected to the safety-level emergency power supply bus;
the first end of the second switch group is connected with the emergency diesel engine, and the second end of the second switch group is connected with the safety emergency power supply bus;
the first end of the third switch group is connected with the safety-level emergency power supply bus, and the second end of the third switch group is connected with the SBO emergency load bus;
the first end of the fourth switch group is connected with the SBO emergency load bus, and the second end of the fourth switch group is connected with the first end of the fifth switch group;
and the second end of the fifth switch group is connected to the SBO power supply bus.
Preferably, the auxiliary power is divided into an auxiliary power a column and an auxiliary power B column according to a power supply load, a first end of a first switch group of the system a column is connected to the auxiliary power a column, and a first end of a first switch group of the system B column is connected to the auxiliary power B column;
emergent diesel engine includes first emergent diesel engine and the emergent diesel engine of second, the first end of the second switch group that the A of system was listed as is connected to first emergent diesel engine, the first end of the second switch group that the B of system was listed as is connected to the emergent diesel engine of second.
Preferably, the SBO emergency load devices include a first SBO emergency load device and a second SBO emergency load device, and the first SBO emergency load device has a higher requirement on timeliness than the second SBO emergency load device.
The invention also constructs an automatic unloading and loading method for the nuclear power plant, which is applied to the automatic unloading and loading system for the nuclear power plant, and the method comprises the following steps:
s1, if the SBO emergency load buses of the A row and the B row of the automatic unloading and loading system of the nuclear power plant are subjected to voltage loss, and the voltage loss time of the A row and the voltage loss time of the B row exceed the preset safety time, entering an SBO working condition;
s2, the states of the first switch group and the second switch group are kept unchanged, and the third switch group is automatically disconnected;
s3, automatically starting the SBO diesel engine by the system to enable the SBO diesel engine to reach rated frequency and voltage;
and S4, the power output switch of the SBO diesel engine, the fifth switch group and the fourth switch group are automatically closed, and the system automatically unloads the SBO emergency load equipment according to a preset sequence.
Preferably, the step S4 includes:
s4-1, automatically closing the power output switch of the SBO diesel engine;
s4-2, the fifth switch group is automatically closed;
s4-3, when the SBO diesel engine power output switch and the fifth switch group are both in a closed state and the third switch group is in an open state, the fourth switch group is automatically closed, and the SBO diesel engine supplies power to the SBO emergency load bus;
and S4-4, automatically unloading the first SBO emergency load equipment and the second type of SBO emergency load equipment on the SBO emergency load bus according to a preset sequence, and then automatically loading the first SBO emergency load equipment on the SBO emergency load bus.
Preferably, the step S4-4 includes:
s4-4-1, dividing the automatic unloading and loading process step into n process steps, wherein the interval time between two adjacent process steps is m seconds, n is a natural number, and m is a positive number;
s4-4-2, automatically unloading all first SBO emergency load equipment and second SBO emergency load equipment except the 0 th work step by the system, and powering on the 0 th work step equipment;
and S4-4-3, automatically loading the nth step equipment in the nth × m seconds, and powering on the nth step equipment until the first SBO emergency load equipment is completely loaded.
Preferably, after the step S4, the method further includes:
and step S5, after the manual operation is allowed, manually inputting a second SBO emergency load device in the SBO emergency loads.
Preferably, the preset safe time is set to 20 seconds.
Preferably, in step S1, the system automatically locks the self-starting function of the high-power device in the second SBO emergency load device while entering the SBO operating mode.
Preferably, the step S5 includes:
s5-1, confirming that the system finishes automatic unloading of the first SBO emergency load equipment and the second SBO emergency load equipment, and that the first SBO emergency load equipment finishes automatic loading and is in a stable operation state;
and S5-2, manually putting a second SBO emergency load device in k work steps in sequence, wherein k is a positive integer.
Preferably, the step S5-2 specifically includes, in the kth step, manually resetting the high-power device in the kth step, which is automatically locked by the system after power loss, and then switching into the kth step device according to an automatic signal or an active switching manner of the high-power device.
Preferably, the high power plant includes a high power process pump, a process valve and a heater.
Preferably, in step S4-4, two sets of automatic unloading and loading logics are set for the devices belonging to the same emergency diesel engine and the SBO diesel engine automatic unloading and loading range and belonging to different time sequence process steps in the first SBO emergency load device.
The implementation of the invention has the following beneficial effects: the automatic unloading and loading system and the method for the nuclear power plant are mainly used for providing emergency power supplies for a safety system under the power-off working condition of the whole plant, so that the working load of operators under the SBO working condition can be effectively reduced, and the misoperation risk is reduced; the reliability of the SBO power supply can be greatly improved, an effective power supply can be timely provided for a safety system after an accident, and the safety of the nuclear power station is improved; the equipment and maintenance cost of the SBO diesel engine is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the configuration of an automatic unloading and loading system for a nuclear power plant according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of an automatic unloading and loading system for a nuclear power plant according to the present invention;
FIG. 3 is a logic block diagram of the switch control for the automatic unloading and loading method of the nuclear power plant of the present invention;
FIG. 4 is a logic diagram of an SBO automatic unloading and loading method of the present invention;
FIG. 5 is a logic diagram of the unloading and loading of the device in the EDG and SBO loading range of the present invention;
fig. 6 is a logic block diagram of the automatic start-up of a high power device of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the invention, the first end refers to the end far away from the SBO diesel engine, and the second end refers to the end close to the SBO diesel engine; SBO DG refers to an SBO diesel engine, SBO working conditions refer to power loss working conditions of the whole plant, service power refers to a conventional power supply system of a nuclear power plant, power of the conventional power supply system comes from a generator of the nuclear power plant or an external power grid, and EDG refers to an emergency diesel engine of the nuclear power plant which deals with the working conditions of the power loss accidents of the whole plant.
As shown in fig. 1, the invention constructs an automatic unloading and loading system of a nuclear power plant, which can be applied to the SBO working condition of the nuclear power plant, and the automatic unloading and loading system of the nuclear power plant comprises an SBO diesel engine, an SBO power supply bus, an SBO emergency load bus, a safety level emergency power supply bus and a plurality of switch groups; under the SBO working condition, the system automatically unloads and loads the SBO emergency load equipment of the nuclear power plant, the SBO emergency load is the SBO emergency load equipment in the minimum range, and the SBO emergency load equipment is mounted on an SBO emergency load bus.
The SBO diesel engine is connected with the SBO power supply bus, and an SBO diesel engine power output switch is arranged between the SBO diesel engine and the SBO power supply bus and used for controlling power output of the SBO diesel engine and supplying power to buses at all levels; the SBO power supply bus, the SBO emergency load bus and the safety level emergency power supply bus are respectively electrically connected with an emergency diesel engine and a plant of a nuclear power plant through a plurality of switch groups. The SBO power supply bus, the SBO emergency load bus and the safety level emergency power supply bus can be supplied with power by an emergency diesel engine, service power or an SBO diesel engine, and power supply selection is performed by controlling a switch according to actual conditions. The emergency power supply bus of the safety level is respectively connected with the emergency diesel engine and the station service power through two different switches, specifically, in the embodiment, the emergency power supply bus of the safety level is connected with the station service power through the first switch group, and is connected with the emergency diesel engine through the second switch group. Therefore, when the first switch group is closed, the service power can be used for supplying power for the load mounted on the safety-level emergency power supply bus, when the service power is lost, the first group of switches is disconnected, and when the second switch group is closed, the emergency diesel engine can be used for supplying power for the load mounted on the safety-level emergency power supply bus.
As shown in fig. 2, further, the automatic unloading and loading system of the nuclear power plant can be divided into a column a and a column B which are redundant to each other according to the power supply load. The A, B series is A, B series in the main process of the nuclear power station, and refers to the redundancy design of the whole nuclear power station from an alternating current power supply to a direct current power supply to a load, the B series is completely redundancy of the A series, and the A series fails without influencing the completion of the nuclear safety function of the B series. Namely, two sets of equipment execute safety functions, one set of equipment fails, the other set of equipment is not influenced, and the functions are continuously executed. Therefore, the emergency power supply system is also provided with two sets which are matched with A, B series of the whole nuclear power station. Understandably, the automatic unloading and loading system of the nuclear power plant is also applicable to the nuclear power plant with a single SBO diesel engine only carrying single-row emergency bus equipment, namely, the automatic unloading and loading function can be realized under the condition that only a single series is included, for example, only A row or B row is included.
The emergency power supply system comprises a power supply system, a power supply system and a power supply system, wherein the power supply system comprises a power supply system and a power supply system; that is, the composition of the a column and the B column is the same, and thus the a column and the B column can be regarded as two column circuits symmetrical to each other. The second end of the column A and the second end of the column B are respectively connected to an SBO power supply bus and are supplied with power by the SBO power supply bus; the first end of the column A and the first end of the column B are both connected to an emergency diesel engine and a service power of a nuclear power plant.
Further, the plurality of switch groups in the column a and the column B each include a first switch group, a second switch group, a third switch group, a fourth switch group, and a fifth switch group;
the first switch group of the A column is arranged between the station power and the safety level emergency power supply bus, the second switch group of the A column is arranged between the emergency diesel engine and the safety level emergency power supply bus, the third switch group of the A column is arranged between the safety level emergency power supply bus and the SBO emergency load bus, and the fourth switch group of the A column and the fifth switch group of the A column are arranged between the SBO emergency load bus and the SBO power supply bus.
Similarly, a first switch group of the B column is arranged between the station power and the safety-level emergency power supply bus, a second switch group of the B column is arranged between the emergency diesel engine and the safety-level emergency power supply bus, a third switch group of the B column is arranged between the safety-level emergency power supply bus and the SBO emergency load bus, and a fourth switch group of the B column and a fifth switch group of the B column are arranged between the SBO emergency load bus and the SBO power supply bus.
Furthermore, a first end of the first switch group is connected with the service power, and a second end of the first switch group is connected to the safety-level emergency power supply bus; the first end of the second switch group is connected with the emergency diesel engine, and the second end of the second switch group is connected with the safety level emergency power supply bus; therefore, the plant power and the emergency diesel engine can respectively supply power for a safety level emergency power supply bus and the like according to actual conditions. The first end of the third switch group is connected with the safety-level emergency power supply bus, and the second end of the third switch group is connected with the SBO emergency load bus; the third switch group can be understood as an outgoing switch of the safety-level emergency power supply bus and an incoming switch of the SBO emergency load bus, and can simultaneously control the opening and closing of the switches. The first end of the fourth switch group is connected with the SBO emergency load bus, and the second end of the fourth switch group is connected with the first end of the fifth switch group; and the second end of the fifth switch group is connected to the SBO power supply bus. The function born by the SBO emergency load bus is higher than that of the SBO power supply bus, so that the safety level and the reliability level of the SBO emergency load bus and the fourth switch group matched with the SBO emergency load bus are higher than those of the SBO power supply bus and the fifth switch group matched with the SBO emergency load bus. Therefore, the two buses are connected, in order to prevent the influence of low-grade equipment faults on high-grade equipment, an isolating switch needs to be arranged, the fourth switch group has the function of the isolating switch besides being an outlet switch of the SBO emergency load bus, and the opening and closing control of the fourth switch group needs to be separated from the fifth switch group. Because the emergency load equipment under the SBO working condition is hung on the SBO emergency load bus, when the SBO diesel engine is required to supply power to the SBO emergency load bus, the fifth switch group is closed, and then when the fifth switch group is detected to be closed and the power supply condition is met, namely when the SBO power supply bus and all the matched equipment are confirmed to be in a normal working state, the fourth switch group can be controlled to be closed, so that the SBO diesel engine is used for supplying power to the SBO emergency load bus.
Further, the automatic unloading and loading system of the nuclear power plant can be divided into the redundant A line and the redundant B line, so that the service power can be divided into the service power A line and the service power B line according to the power supply load, specifically, the first end of the first switch group of the system A line is connected to the service power A line, and the first end of the first switch group of the system B line is connected to the service power B line. The emergency diesel engine comprises a first emergency diesel engine and a second emergency diesel engine, the first end of the second switch group of the A line of the system is connected to the first emergency diesel engine, the first end of the second switch group of the B line of the system is connected to the second emergency diesel engine, and configuration of the redundant A line and the B line is achieved.
Further, the SBO emergency load equipment comprises first SBO emergency load equipment and second SBO emergency load equipment, and the first SBO emergency load equipment has higher requirement on timeliness than the second SBO emergency load equipment. Specifically, the first SBO emergency load device is a device with a high requirement on timeliness, and the second SBO emergency load device is a device with a low requirement on timeliness. Preferably, the first SBO emergency load device mainly considers devices with high timeliness such as heating ventilation, and all loads should be as small as possible, and the loading can be completely completed in step 0. Wherein, the high equipment of ageing nature requirement includes: partial equipment in a nuclear power plant is required to be in an emergency working state at any time so as to be immediately put into operation when an accident condition occurs. When the SBO diesel engine starts, these highly time-efficient devices must first be powered, and in a nuclear power plant, the time-efficient devices generally include: safety special system equipment which is required to be timely input through safety analysis, and all support systems required by the operation of the safety special system equipment, such as heating ventilation, power supply, lighting equipment and the like.
The invention also constructs an automatic unloading and loading method for the nuclear power plant, which can be applied to the automatic unloading and loading system for the nuclear power plant, and the method comprises the following steps:
s1, if the SBO emergency load buses of the A row and the B row of the automatic unloading and loading system of the nuclear power plant are subjected to voltage loss, and the voltage loss time of the A row and the voltage loss time of the B row exceed the preset safety time, entering an SBO working condition;
further, the preset safe time is preferably set to 20 seconds. Understandably, the preset safety time can be adjusted according to the actual operation condition.
Further, in step S1, the system automatically locks the self-starting function of the high-power device in the second SBO emergency load device while entering the SBO operating mode. The high-power equipment refers to single equipment or equipment groups with loads exceeding single-step loading capacity of an SBO diesel engine in a certain process step of automatic loading, and the common high-power equipment comprises the following components: electric pump, heater, motor with power of hundreds and tens kilowatts. The SBO diesel engine is loaded step by step, i.e. each step can only carry certain power equipment, if these high power equipment is not controlled and started intensively, load impact is caused, which directly results in the failure of the SBO diesel engine, therefore, locking logic must be set.
S2, the states of the first switch group and the second switch group are kept unchanged, the state before power failure is maintained, and the third switch group is automatically disconnected;
s3, automatically starting the SBO diesel engine by the system to enable the SBO diesel engine to reach rated frequency and voltage;
and S4, the power output switch of the SBO diesel engine, the fifth switch group and the fourth switch group are automatically closed, and the system automatically unloads the SBO emergency load equipment according to a preset sequence.
As shown in fig. 3, further, step S4 specifically includes:
s4-1, automatically closing an SBO diesel engine power output switch;
s4-2, the fifth switch group is automatically closed;
s4-3, when the power output switch of the SBO diesel engine and the fifth switch set are in a closed state, and the third switch set is in an open state, the fourth switch set is automatically closed, and the SBO diesel engine supplies power to the SBO emergency load bus;
s4-4, continuously detecting that the voltage U of the SBO emergency load bus is less than 0.8Un, wherein Un is the rated voltage of the bus; the system automatically unloads the first SBO emergency load equipment and the second SBO emergency load equipment on the SBO emergency load bus according to a preset sequence, and then automatically loads the first SBO emergency load equipment on the SBO emergency load bus.
As shown in fig. 4, further, to ensure that parameters such as the output frequency and the voltage of the SBO diesel engine can be stabilized within a required range during the whole automatic unloading and loading process, the automatic unloading and loading logic of the SBO diesel engine loads in steps according to a time sequence, each step carries a certain amount of load, each step is spaced by ms, n steps are counted, n is determined according to the total load of the SBO working condition and the single-step carrying capacity of the SBO diesel engine, and the duration of the whole automatic loading is mns.
The step-by-step automatic load logic is realized by an SBO unloading instruction and an SBO loading instruction together: the SBO unloading instruction is used for unloading all SBO emergency loads except the SBO emergency load of the 0 th work step and continuously forbidding starting of related equipment in the corresponding work step; and the SBO loading instruction is used for immediately starting the related equipment of the corresponding process step after the unloading instruction of the corresponding process step disappears. All the devices are set to be in the off action prior to the on action, namely after the devices receive the on and off instructions at the same time, the devices preferentially execute the off action.
Wherein, step S4-4 system unloads SBO emergency load according to the automatic unloading work step in the preset order automatically, specifically includes:
s4-4-1, the automatic unloading and loading process step is divided into n steps, namely, the process step is divided into a 0 th process step, a 1 st process step and a 2 nd process step which are sequentially carried out to the nth process step. The interval time of two adjacent steps is m seconds, n is a natural number, and m is a positive number. The type of the load loaded in each working step, the load capacity in each working step and the total working step number are determined according to the first SBO emergency equipment of the nuclear power plant, the load, the performance and the capacity of an SBO diesel engine and the like;
s4-4-2, automatically unloading all SBO emergency load equipment except the 0 th work step by the system, wherein the SBO emergency load equipment comprises first SBO emergency load equipment and second SBO emergency load equipment, and powering on the 0 th work step equipment;
and S4-4-3, automatically loading the nth step equipment at the nth × m seconds, powering on the nth step equipment, and sequentially loading the first SBO emergency load equipment until the first SBO emergency load equipment is completely loaded.
As shown in fig. 5, further, part of the devices in the first SBO emergency load also belong to the automatic unloading and loading range of the emergency diesel engine, and the devices may be powered by the emergency diesel engine or the SBO diesel engine, and need to be provided with two different automatic unloading and loading logics, and are controlled according to the two different automatic unloading and loading logics.
In step S4-4, for a device in the first SBO emergency load device that belongs to the same range of the emergency diesel engine and the SBO diesel engine automatic unloading program, if the emergency diesel engine automatic unloading step where the device is located is different from the SBO diesel engine automatic unloading step in time sequence, the device needs to design two sets of automatic loading logic. Fig. 5 shows an example of the design of the automatic unloading and loading logic of such a device, for example, the device loads the logic at the 20 th loading step in the automatic unloading and loading sequence of the emergency diesel engine and loads the logic at the 5 th loading step in the automatic unloading and loading sequence of the SBO diesel engine, and since the emergency diesel engine and the SBO diesel engine are not simultaneously started, both sets of loading logics can normally perform functions and do not interfere with each other.
As shown in fig. 6, further, after step S4, the method further includes: and step S5, after the manual operation is allowed, manually inputting a second SBO emergency load device in the SBO emergency loads. For the high-power equipment which is not in the SBO automatic loading program but needs to be used under the SBO working condition, specifically, the high-power equipment comprises a high-power process pump, a process valve, a heater and the like, in order to prevent the SBO diesel engine from failing to load due to the fact that the instantaneous load exceeds the single-step loading capacity of the SBO diesel engine because the high-priority command is received for automatic starting during the process that an operator manually puts into other equipment after the SBO automatic loading program is finished. The design is that after the A, B column safety level emergency power supply bus is subjected to voltage loss for a certain preset time, the example in fig. 6 is preferably set to 20s, the self-starting of the high-power equipment is automatically locked, and after other SBO loads are put into use, the locking is manually reset, and then the high-power equipment is manually put into use.
Further, step S5 specifically includes:
s5-1, confirming that the system completes automatic unloading of the first SBO emergency load equipment and the second SBO emergency load equipment and automatically completes automatic loading of the first SBO emergency load equipment and stable operation of the equipment;
and S5-2, manually putting second SBO emergency load equipment in k work steps in sequence, and determining a k value according to the performance and capacity of the SBO diesel engine of the nuclear power plant, the second SBO emergency load and the like, wherein k is a positive integer.
Further, step S5-2 specifically includes, in the kth step, resetting the high-power device in the kth step automatically locked by the manual reset system after power loss, and then switching into the kth step device according to an automatic signal or an active switching manner of the high-power device.
In the automatic unloading and loading system and method for the nuclear power plant, the SBO diesel engine configured for the nuclear power plant is mainly used for providing an emergency power supply for a safety system under the power-off working condition of the whole plant, so that the safety influence of the working condition accident on the nuclear power plant is reduced to the maximum extent. In order to reduce the equipment layout space, improve the system automation degree, reduce the engineering cost and optimize the operator load, the automatic on-load design scheme of the SBO diesel engine under the power-off working condition of the whole nuclear power plant is provided, and the automatic on-load design scheme is particularly suitable for compact design and small nuclear power facilities with less personnel configuration. The workload of operators under the SBO working condition can be effectively reduced, and the misoperation risk is reduced; the reliability of the SBO power supply can be greatly improved, an effective power supply can be timely provided for a safety system after an accident, and the safety of the nuclear power station is improved; the method can realize the loading of the SBO diesel engine with multiple sequences of SBO loads, obviously reduces the equipment and maintenance cost of the SBO diesel engine, has smaller capacity than the diesel engine in the prior art, and is more convenient to realize.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (16)
1. An automatic unloading and loading system of a nuclear power plant is applied to the SBO working condition of the nuclear power plant and is characterized by comprising an SBO diesel engine, an SBO power supply bus, an SBO emergency load bus, a safety level emergency power supply bus and a plurality of switch groups; under the SBO working condition, the system automatically unloads and loads SBO emergency load equipment of the nuclear power plant, and the SBO emergency load equipment is mounted on the SBO emergency load bus;
the SBO diesel engine is connected with the SBO power supply bus, and an SBO diesel engine power output switch is arranged between the SBO diesel engine and the SBO power supply bus; the SBO power supply bus, the SBO emergency load bus and the safety level emergency power supply bus are electrically connected with an emergency diesel engine and a plant of a nuclear power plant through a plurality of switch groups.
2. The automatic unloading and loading system for nuclear power plant according to claim 1, characterized in that it is divided into a redundant column a and a redundant column B, both said column a and said column B comprising said SBO emergency load bus, said safety level emergency power supply bus, said emergency diesel engine and a plurality of said switch blocks;
the second end of the column A and the second end of the column B are respectively connected to the SBO power supply bus and are supplied with power by the SBO power supply bus; the first end of the column A and the first end of the column B are both connected to the emergency diesel engine and the service power of the nuclear power plant.
3. The automatic unloading and loading system of nuclear power plant according to claim 2, characterized in that the plurality of switch sets includes a first switch set, a second switch set, a third switch set, a fourth switch set and a fifth switch set;
the first switch group is arranged between the station power and the safety level emergency power supply bus, the second switch group is arranged between the emergency diesel engine and the safety level emergency power supply bus, the third switch group is arranged between the safety level emergency power supply bus and the SBO emergency load bus, and the fourth switch group and the fifth switch group are arranged between the SBO emergency load bus and the SBO power supply bus.
4. The automatic unloading and loading system for nuclear power plant according to claim 3,
the first end of the first switch group is connected with the service power, and the second end of the first switch group is connected to the safety level emergency power supply bus;
the first end of the second switch group is connected with the emergency diesel engine, and the second end of the second switch group is connected with the safety emergency power supply bus;
the first end of the third switch group is connected with the safety-level emergency power supply bus, and the second end of the third switch group is connected with the SBO emergency load bus;
the first end of the fourth switch group is connected with the SBO emergency load bus, and the second end of the fourth switch group is connected with the first end of the fifth switch group;
and the second end of the fifth switch group is connected to the SBO power supply bus.
5. The automatic unloading and loading system of nuclear power plant according to claim 4, wherein the service power is divided into a service power A column and a service power B column according to a power supply load, a first end of a first switch group of the system A column is connected to the service power A column, and a first end of a first switch group of the system B column is connected to the service power B column;
emergent diesel engine includes first emergent diesel engine and the emergent diesel engine of second, the first end of the second switch group that the A of system was listed as is connected to first emergent diesel engine, the first end of the second switch group that the B of system was listed as is connected to the emergent diesel engine of second.
6. The automatic nuclear power plant unloading system of claim 1, wherein the SBO emergency load devices include a first SBO emergency load device and a second SBO emergency load device, the first SBO emergency load device having a higher demand on timeliness than the second SBO emergency load device.
7. An automatic unloading and loading method for a nuclear power plant, which is applied to the automatic unloading and loading system for the nuclear power plant according to any one of claims 3 to 6, and is characterized by comprising the following steps:
s1, if the SBO emergency load buses of the A row and the B row of the automatic unloading and loading system of the nuclear power plant are subjected to voltage loss, and the voltage loss time of the A row and the voltage loss time of the B row exceed the preset safety time, entering an SBO working condition;
s2, the states of the first switch group and the second switch group are kept unchanged, and the third switch group is automatically disconnected;
s3, automatically starting the SBO diesel engine by the system to enable the SBO diesel engine to reach rated frequency and voltage;
and S4, the power output switch of the SBO diesel engine, the fifth switch group and the fourth switch group are automatically closed, and the system automatically unloads the SBO emergency load equipment according to a preset sequence.
8. The automatic unloading and loading method for nuclear power plant according to claim 7, wherein the step S4 includes:
s4-1, automatically closing the power output switch of the SBO diesel engine;
s4-2, the fifth switch group is automatically closed;
s4-3, when the SBO diesel engine power output switch and the fifth switch group are both in a closed state and the third switch group is in an open state, the fourth switch group is automatically closed, and the SBO diesel engine supplies power to the SBO emergency load bus;
and S4-4, automatically unloading the first SBO emergency load equipment and the second type of SBO emergency load equipment on the SBO emergency load bus according to a preset sequence, and then automatically loading the first SBO emergency load equipment on the SBO emergency load bus.
9. The automatic unloading and loading method for nuclear power plant according to claim 8, wherein the step S4-4 includes:
s4-4-1, dividing the automatic unloading and loading process step into n process steps, wherein the interval time between two adjacent process steps is m seconds, n is a natural number, and m is a positive number;
s4-4-2, automatically unloading all first SBO emergency load equipment and second SBO emergency load equipment except the 0 th work step by the system, and powering on the 0 th work step equipment;
and S4-4-3, automatically loading the nth step equipment in the nth × m seconds, and powering on the nth step equipment until the first SBO emergency load equipment is completely loaded.
10. The automatic unloading and loading method for nuclear power plant according to claim 7, characterized by further comprising, after the step S4:
and step S5, after the manual operation is allowed, manually inputting a second SBO emergency load device in the SBO emergency loads.
11. The automatic unloading and loading method for nuclear power plant according to claim 7, characterized in that the preset safe time is set to 20 seconds.
12. The automatic unloading method for nuclear power plant according to claim 10, wherein in step S1, the system automatically locks the self-starting function of the high-power equipment in the second SBO emergency load equipment while entering the SBO operating mode.
13. The automatic unloading and loading method for nuclear power plant according to claim 12, wherein the step S5 includes:
s5-1, confirming that the system finishes automatic unloading of the first SBO emergency load equipment and the second SBO emergency load equipment, and that the first SBO emergency load equipment finishes automatic loading and is in a stable operation state;
and S5-2, manually putting a second SBO emergency load device in k work steps in sequence, wherein k is a positive integer.
14. The automatic unloading and loading method for nuclear power plant according to claim 13, wherein the step S5-2 specifically includes, in the kth step, manually resetting the high power equipment in the kth step that is automatically locked by the system after power loss, and then switching on the kth step equipment according to an automatic signal or an active switching-on mode of the high power equipment.
15. The automatic unloading method for nuclear power plant according to claim 12, characterized in that said high power equipment comprises high power process pumps, process valves and heaters.
16. The automatic unloading and loading method for nuclear power plant according to claim 8, characterized in that in step S4-4, two sets of automatic unloading and loading logics are set for the devices belonging to the same automatic unloading and loading range of the emergency diesel engine and the SBO diesel engine and belonging to different time sequence steps in the first SBO emergency loading device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111264630.6A CN114157012A (en) | 2021-10-28 | 2021-10-28 | Automatic unloading and loading system and method for nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111264630.6A CN114157012A (en) | 2021-10-28 | 2021-10-28 | Automatic unloading and loading system and method for nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114157012A true CN114157012A (en) | 2022-03-08 |
Family
ID=80459493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111264630.6A Pending CN114157012A (en) | 2021-10-28 | 2021-10-28 | Automatic unloading and loading system and method for nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114157012A (en) |
-
2021
- 2021-10-28 CN CN202111264630.6A patent/CN114157012A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106160202B (en) | Power supply method and system for nuclear power plant primary circuit hydrostatic test | |
| CN111244916B (en) | Hardware interlocking method for key alternating current contactor in aviation power distribution system | |
| CN107528293A (en) | The treating method and apparatus of unit failure | |
| CN105098968B (en) | A kind of nuclear power plant's Primary hydraulic test dead electricity control method and system | |
| CN109004738A (en) | A kind of atomic-powered ship primary Ioops emergency power supply system and method | |
| CN114157012A (en) | Automatic unloading and loading system and method for nuclear power plant | |
| CN111404259B (en) | Security section power supply system of generator set and switching method thereof | |
| CN210488750U (en) | Safety chain system for fuel cell test bench | |
| CN114157013B (en) | Semi-automatic unloading and loading system and method for nuclear power plant | |
| CN105332744B (en) | Thermal power generation unit prevents the check method of protection system in heat power engineering failure | |
| CN109254250B (en) | Factory power supply switching experimental method in cold state function test stage of nuclear power station primary loop | |
| CN114336953B (en) | Control method of energy router, central controller and energy router | |
| CN110597173B (en) | Main transformer cooling control method | |
| KR100728576B1 (en) | system for supplying emergency power of water treatment apparatus | |
| US10629923B2 (en) | Radiator cleaning treatment method and method for cleaning radiator | |
| CN109150038B (en) | System for judging excitation state of diesel generator of million-kilowatt nuclear power station | |
| CN111224342A (en) | Transformer anti-misoperation topology five-prevention design method based on dispatching automation system | |
| CN110706892B (en) | Transformer cooling system capable of realizing state self-holding function | |
| JP2018147831A (en) | Starting method of fuel cell system | |
| CN115882487B (en) | Control device, control method, storage medium and energy storage system | |
| CN113488211B (en) | Control method for high-temperature gas cooled reactor plant water system based on MACS6 platform | |
| Okhlopkov et al. | Modernization of direct current system at Mosénergo CHP | |
| CN214900201U (en) | Circulating water system liquid accuse non return butterfly valve electrical power generating system | |
| JPS6249469B2 (en) | ||
| CN208489689U (en) | Reactor Spent Fuel Pool cooling water pump power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |