CN116066248A - Nuclear power plant diesel generator set unloading instruction generation device and method - Google Patents
Nuclear power plant diesel generator set unloading instruction generation device and method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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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
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Abstract
The invention discloses a device and a method for generating unloading instructions of a diesel generating set of a nuclear power plant, wherein the device comprises an isolation distribution unit, a first logic unit, a second logic unit, a third logic unit and an OR logic unit, and the first/second logic unit comprises a special logic processing module and a three-out-of-two logic voting module; according to the invention, the first logic unit, the second logic unit and the third logic unit are arranged, the first logic unit and the second logic unit are configured in a diversity mode, the third logic unit assists the first logic unit and the second logic unit, the unloading instruction is generated through the first logic unit and the second logic unit at the same time, and the unloading instruction is judged through OR logic, so that the normal execution of the unloading function of the diesel engine can be ensured when a single special logic processing unit fails or is maintained.
Description
Technical Field
The invention relates to the technical field of nuclear power station instruments and control, in particular to a device and a method for generating unloading instructions of a diesel generator set of a nuclear power plant.
Background
The diesel generator set is used as a standby power supply of the nuclear power plant, and when a power failure accident is caused by power failure of an off-plant main power supply or a fault of the bus itself, the diesel generator set can provide power for the emergency bus, so that the safe driver can smoothly execute actions of the safe driver and damage of important equipment due to power failure of the on-plant power system is prevented.
When the diesel generator set is started to recover the station service power, the capacity of the diesel generator set cannot meet the requirement that all station service equipment powered by the emergency power distribution device is started simultaneously because the starting power of the motor is larger than the rated power. Therefore, a loading/unloading program is needed to cut off most of the special safety equipment, and the cut-off special safety equipment is restarted in batches according to the requirement and the capacity of the diesel generator set.
The unloading instruction of the diesel generating set is realized in a special logic processing unit in a reactor protection system (RPS system for short), the RPS system monitors the bus voltage and the state of a power circuit breaker, and the unloading instruction is sent to a relevant safety driver to finish unloading after the necessary logic processing of the special logic processing unit.
The RPS system at the present stage cannot meet the following requirements:
the execution safety is that the RPS system is required to send an unloading instruction when an accident occurs in the power plant and the superposition loses the external power of the power plant, so that the diesel generator set can be normally loaded, and the signal is required to be sent in time when required.
And the system is safely executed, namely, system misoperation caused by single equipment fault is avoided.
Disclosure of Invention
The invention aims to provide a device and a method for generating unloading instructions of a diesel generating set of a nuclear power plant, which solve the problem that an RPS system at the present stage can not timely send out signals or send out error signals due to equipment faults.
The invention is realized by the following technical scheme:
in a first aspect, a device for generating unloading instructions of a diesel generator set in a nuclear power plant includes:
the isolation distribution unit is used for receiving and isolating and distributing unloading signals output by the alternating current emergency power distribution system;
a first logic unit having a first input, a second input, a network communication interface, a first output, and a second output;
a second logic unit having a first input, a second input, a network communication interface, a first output, and a second output;
a third logic unit having an input and a network communication interface;
an or logic unit having a first input, a second input, and an output;
the first input end of the first logic unit, the first input end of the second logic unit and the input end of the third logic unit are all connected with the output end of the isolation distribution unit; the network communication interface of the first logic unit, the network communication interface of the second logic unit and the network communication interface of the third logic unit are in communication connection, a first output end of the first logic unit is connected with a second input end of the second logic unit, and a first output end of the second logic unit is connected with a second input end of the first logic unit;
the second output end of the first logic unit and the second output end of the second logic unit are connected with the first input end and the second input end of the OR logic unit, and the output end of the OR logic unit outputs an unloading instruction.
Specifically, the first logic unit includes:
the first special logic processing module is used for receiving signals acquired by the first input end of the first logic unit, and outputting first output signals after logic processing;
the first three-out-of-two logic voting module is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the first three-out-of-two logic voting module is connected with the output end of the first special logic processing module, the second input end of the first three-out-of-two logic voting module is connected with the first output end of the second logic unit, the third input end of the first three-out-of-two logic voting module is connected with the output end of the third logic unit, and the output end of the first three-out-of-two logic voting module is connected with the first input end of the OR logic unit;
in this embodiment, both the dedicated logic processing and the "two-out-of-three" logic voting in the first logic unit may be completed by the same processing unit, i.e., each interface of the first dedicated logic processing module and the first "two-out-of-three" logic voting module is a software internal interface, and is not two independent hardware units.
The second logic unit includes:
the second special logic processing module is used for receiving the signals acquired by the first input end of the second logic unit, and outputting first output signals after logic processing;
the second 'three-out-of-two' logic voting module is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the second 'three-out-of-two' logic voting module is connected with the output end of the second special logic processing module, the second input end of the second 'three-out-of-two' logic voting module is connected with the first output end of the first logic unit, the third input end of the second 'three-out-of-two' logic voting module is connected with the output end of the third logic unit, and the output end of the second 'three-out-of-two' logic voting module is connected with the second input end of the OR logic unit;
in this embodiment, both the dedicated logic processing and the "two-out-of-three" logic voting in the second logic unit may be completed by the same processing unit, i.e., each interface of the second dedicated logic processing module and the second "two-out-of-three" logic voting module is a software internal interface, and is not two independent hardware units.
The third logic unit includes:
the third special logic processing module is used for receiving the signal acquired by the first input end of the third logic unit, and outputting a network communication signal after logic processing.
The network communication interface of the first logic unit, the network communication interface of the second logic unit and the network communication interface of the third logic unit are connected through point-to-point network communication; the method comprises the steps of carrying out a first treatment on the surface of the
The second input end of the first logic unit is connected with the first output end of the second logic unit through hard wiring;
the second input of the second logic unit is connected to the first output of the first logic unit by hard wiring.
Optionally, the first logic unit/the second logic unit is provided with two DO interfaces, two DI interfaces and 1 COM interface;
the third logic unit is provided with 1 DI interface and 1 COM interface.
In a second aspect, a method for generating a unloading command of a diesel generator set in a nuclear power plant, based on the device for generating the unloading command of the diesel generator set in the nuclear power plant, the method includes:
receiving an unloading signal output by an alternating current emergency power distribution system;
isolating the unloading signals and dividing the unloading signals into three paths of unloading signals;
carrying out logic processing on the unloading signal to generate a first input signal of a logic voting module;
carrying out logic processing on the unloading signal to generate a second input signal of the logic voting module;
carrying out logic processing on the unloading signal to generate a third input signal of the logic voting module;
performing 'two-out-of-three' logic voting on a first input signal, a second input signal and a third input signal of a logic voting module of the first logic unit, and outputting an output signal of the first logic unit;
performing 'two-out-of-three' logic voting on the first input signal, the second input signal and the third input signal of the logic voting module of the second logic unit again, and outputting an output signal of the second logic unit;
and performing OR logic operation on the output signal of the first logic unit and the output signal of the second logic unit, and outputting an unloading instruction.
The method for the three-taking-two logic voting comprises the following steps:
judging whether the quality bits of the first input signal, the second input signal and the third input signal are valid or not respectively;
if the number of the effective input signals is 3 and the voting logic is 2/3, the quality bits of the output signals are effective;
if the number of the effective input signals is 2 and the voting logic is 1/2, the quality bits of the output signals are effective;
if the number of the effective input signals is 1 and the voting logic is 1/1, the quality bits of the output signals are effective;
if the number of valid input signals is 0, the quality bits of the output signal are not valid.
Specifically, the generation method includes:
the isolation distribution unit receives an unloading signal output by the alternating current emergency power distribution system, isolates the unloading signal, divides the unloading signal into three paths of unloading signals and inputs the three paths of unloading signals to the first logic unit, the second logic unit and the third logic unit respectively;
the first special logic processing unit performs logic processing on the unloading signal to generate a first input signal;
the second special logic processing unit performs logic processing on the unloading signal to generate a second input signal;
the third special logic processing unit performs logic processing on the unloading signal to generate a third input signal;
inputting a first input signal, a second input signal and a third input signal into a first three-out-of-two logic voting module, carrying out three-out-of-two logic voting, and outputting a first output signal;
inputting the first input signal, the second input signal and the third input signal into a second 'two-out-of-three' logic voting module, carrying out 'two-out-of-three' logic voting, and outputting a second output signal;
the first output signal and the second output signal are input into an OR logic unit, OR logic operation is carried out, and an unloading instruction is output.
Optionally, the unloading instruction output by the or logic unit is sent to a priority processing module connected with the electric equipment.
Optionally, when the first logic unit/the second logic unit/the third logic unit fails, a default value is adopted to lock signal output.
Optionally, the first logic unit and the second logic unit have the same structure, and the logic voting methods of the first logic unit and the second logic unit are the same.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the first logic unit, the second logic unit and the third logic unit are arranged, the first logic unit and the second logic unit are configured in a diversity mode, the third logic unit assists the first logic unit and the second logic unit, and the unloading instruction is generated through the first logic unit and the second logic unit at the same time, and the unloading instruction is judged through OR logic, so that the normal execution of the unloading function of the diesel engine can be ensured when a single logic processing unit fails or is maintained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a device for generating unloading instructions of a diesel generator set in a nuclear power plant according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and embodiments, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the invention.
It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Embodiments of the present invention and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
In order to realize the functions of executing safety and executing safety, the embodiment provides a method for generating an unloading instruction of a diesel generating set of a nuclear power plant, which comprises the following steps:
and receiving an unloading signal output by the alternating current emergency power distribution system.
And then isolating the unloading signals and dividing the unloading signals into three paths of unloading signals, so that the three paths of unloading signals can be processed simultaneously in the later period.
Logically processing the unloading signal to generate a first input signal; logically processing the unloading signal to generate a second input signal; logically processing the unloading signal to generate a third input signal;
performing 'three-out-of-two' logic voting on the first input signal, the second input signal and the third input signal, and outputting a first logic unit output signal;
performing 'three-out-two' logic voting on the first input signal, the second input signal and the third input signal again, and outputting a second logic unit output signal;
and performing OR logic operation on the first logic unit output signal and the second logic unit output signal, and outputting an unloading instruction.
By setting the logic voting twice and performing OR operation on the results of the logic voting twice, the problem that an unloading instruction cannot be generated due to the fact that a certain logic unit fails can be avoided.
The method for the three-taking-two logic voting is as follows:
judging whether the quality bits of the first input signal, the second input signal and the third input signal are valid or not respectively;
if the number of the effective input signals is 3 and the voting logic is 2/3, the quality bits of the output signals are effective;
if the number of the effective input signals is 2 and the voting logic is 1/2, the quality bits of the output signals are effective;
if the number of the effective input signals is 1 and the voting logic is 1/1, the quality bits of the output signals are effective;
if the number of valid input signals is 0, the quality bits of the output signal are not valid.
The specific table is shown below:
| voting logic | Number of active input signals | Quality bits of output signal |
| 2/3 | 3 | Effective and effective |
| 1/2 | 2 | Effective and effective |
| 1/1 | 1 | Effective and effective |
| 2/3 | 0 | Invalidation of |
Example two
The RPS system at the present stage is provided with a special logic processing unit which is the prior art and is used for processing the unloading signal output by the isolated alternating current emergency power distribution system so as to generate an unloading instruction.
As shown in fig. 1, the present embodiment provides a generating device capable of implementing the method for generating an unloading instruction of a diesel generator set in a nuclear power plant in the first embodiment, where the generating device includes an isolation allocation unit, a first logic unit, a second logic unit, a third logic unit, and an or logic unit.
The isolation distribution unit is used for receiving and isolating and distributing the unloading signal output by the alternating current emergency power distribution system, namely, the purpose of isolating the unloading signal and dividing the unloading signal into three is achieved.
The first logic unit is provided with a first input end, a second input end, a network communication interface, a first output end and a second output end; the second logic unit is provided with a first input end, a second input end, a network communication interface, a first output end and a second output end; the third logic unit is provided with an input end and a network communication interface; the or logic unit has a first input, a second input, and an output.
The first logic unit is used for realizing the output of the first output signal, the second logic unit is used for realizing the output of the second output signal, and the third logic unit does not output the output signal.
The connection modes of the first logic unit, the second logic unit, the third logic unit, the "or" logic unit will be briefly described.
The first input end of the first logic unit, the first input end of the second logic unit and the input end of the third logic unit are all connected with the output end of the isolation distribution unit; the network communication interface of the first logic unit and the network communication interface of the second logic unit are both connected with the network communication interface of the third logic unit, the first output end of the first logic unit is connected with the second input end of the second logic unit, and the first output end of the second logic unit is connected with the second input end of the first logic unit;
the second output end of the first logic unit and the second output end of the second logic unit are connected with the first input end and the second input end of the OR logic unit, and the output end of the OR logic unit outputs an unloading instruction.
In order to realize the generation of the first input signal and the three-out-of-two logic voting, the first logic unit comprises a first special logic processing module and a first three-out-of-two logic voting module.
The first special logic processing module is used for receiving signals acquired by the first input end of the first logic unit, and outputting first output signals after logic processing.
The first "two out of three" logic voting module has a first input, a second input, a third input, and an output.
The first input end of the first 'three-out-of-two' logic voting module is connected with the output end of the first special logic processing module, the second input end of the first 'three-out-of-two' logic voting module is connected with the first output end of the second logic unit, the third input end of the first 'three-out-of-two' logic voting module is connected with the output end of the third logic unit, and the output end of the first 'three-out-of-two' logic voting module is connected with the first input end of the OR logic unit;
in order to realize the generation of the second input signal and the 'two out of three' logic voting, the second logic unit comprises a second special logic processing module and a second 'two out of three' logic voting module.
The second special logic processing module receives the signal acquired by the first input end of the second logic unit, and outputs a second output signal after logic processing;
the second three-out-of-two logic voting module is provided with a first input end, a second input end, a third input end and an output end, the first input end of the second three-out-of-two logic voting module is connected with the output end of the second special logic processing module, the second input end of the second three-out-of-two logic voting module is connected with the first output end of the first logic unit, the third input end of the second three-out-of-two logic voting module is connected with the output end of the third logic unit, and the output end of the second three-out-of-two logic voting module is connected with the second input end of the OR logic unit;
in order to enable generation of the third input signal, the third logic unit comprises:
the third special logic processing module is used for receiving the signal acquired by the first input end of the third logic unit, and outputting a network communication signal after logic processing.
The first special logic processing unit, the second special logic processing unit and the third special logic processing unit have the same structure and signal processing logic as those of the special logic processing unit of the reactor protection system (RPS system for short), and the special logic processing unit, the second special logic processing unit and the third special logic processing unit do not need to be additionally described and can be adopted in the prior art.
The first logic unit and the second logic unit have the same structure, and the logic voting methods of the first logic unit and the second logic unit are the same. The first logic unit and the second logic unit adopt designs with mutual diversity, are not easy to be influenced by common cause faults of software, and in order to further avoid communication influence, the second input end of the first logic unit is connected with the first output end of the second logic unit through hard wiring; the second input of the second logic unit is connected to the first output of the first logic unit by hard wiring.
The third logic unit is realized by a processing unit which mainly executes the auxiliary function of the system, and network communication is configured between the third logic unit and the first logic unit and between the third logic unit and the second logic unit, and the third logic unit is responsible for providing a third driving signal.
The network communication interface of the first logic unit and the network communication interface of the second logic unit are communicated with the network communication interface of the third logic unit through a network;
for hard-wired and network communication, the first logic unit/second logic unit is provided with two DO interfaces, two DI interfaces and 1 COM interface; the third logic unit is provided with 1 DI interface and 1 COM interface.
Example III
Based on the first embodiment and the second embodiment, the present embodiment provides a method for generating an unloading instruction of a diesel generator set in a nuclear power plant, including:
the isolation distribution unit receives an unloading signal output by the alternating current emergency power distribution system, isolates the unloading signal, divides the unloading signal into three paths of unloading signals and inputs the three paths of unloading signals to the first logic unit, the second logic unit and the third logic unit respectively.
The first special logic processing module carries out logic processing on the unloading signal to generate a first input signal; the second special logic processing module carries out logic processing on the unloading signal to generate a second input signal; the third special logic processing module performs logic processing on the unloading signal to generate a third input signal.
The first input signal, the second input signal and the third input signal are input to a first three-out-of-two logic voting module, and the three-out-of-two logic voting is carried out to output a first output signal.
And inputting the first input signal, the second input signal and the third input signal into a second three-out-of-two logic voting module, carrying out three-out-of-two logic voting, and outputting a second output signal.
The first output signal and the second output signal are input into an OR logic unit, OR logic operation is carried out, and an unloading instruction is output. And finally, the hardware output driving circuit carries out OR logic processing on the two paths of output signals and sends the OR logic processing to relevant electric equipment.
Therefore, the requirements of the diesel engine unloading function on anti-refusing action and anti-misoperation are met, and an unloading output instruction is generated through logic voting, so that the system function can be normally executed when a single fault occurs.
In addition, the unloading instructions output by the OR logic unit are sent to the priority processing module connected with the electric equipment and are processed through the priority processing module. And judging the unloading priority of the subsequent electric equipment.
The first and second three-taking-two logic voting modules monitor the first, second and third input signals received by the first and second three-taking-two logic voting modules on line, when the quality bits of the input signals are invalid, the first and second three-taking-two logic voting modules reject and fail-safe fault signals, and the residual effective signals are utilized for carrying out logic voting, so that the output of the logic voting modules is always in a determined effective state. When all three paths of input signals fail, the quality position of the output signal is invalid and is sent to downstream logic for judgment, namely, the designed logic degradation mode of '2/3- >1/2- >1/1- > invalid'.
The embodiment realizes the 'three-out-of-two' logic voting in the software by utilizing the two processing units which are designed for diversity, reduces the influence of common cause faults of the software, obviously improves the reliability of the system, can ensure the normal execution of the unloading function of the diesel engine when a single special logic processing unit fails or is maintained, and avoids the system from refusing to operate or malfunction.
In addition, the logic unit is monitored on line, and after the fault is found, the output signal is automatically locked, so that the unloading instruction is prevented from being sent by mistake. If the real driving signal appears at this time, the logic voting can be completed through another processing unit with different diversity and an unloading instruction can be sent out.
And when the first special logic processing unit/the second special logic processing unit/the third special logic processing unit fails, locking signal output by adopting a default value.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above-described invention will be apparent to those of skill in the art, and are still within the scope of the invention.
Claims (10)
1. The utility model provides a nuclear power plant's diesel generating set uninstallation instruction generation device which characterized in that includes:
the isolation distribution unit is used for receiving and isolating and distributing unloading signals output by the alternating current emergency power distribution system;
a first logic unit having a first input, a second input, a network communication interface, a first output, and a second output;
a second logic unit having a first input, a second input, a network communication interface, a first output, and a second output;
a third logic unit having an input and a network communication interface;
an or logic unit having a first input, a second input, and an output;
the first input end of the first logic unit, the first input end of the second logic unit and the input end of the third logic unit are all connected with the output end of the isolation distribution unit; the network communication interface of the first logic unit, the network communication interface of the second logic unit and the network communication interface of the third logic unit are in communication connection, a first output end of the first logic unit is connected with a second input end of the second logic unit, and a first output end of the second logic unit is connected with a second input end of the first logic unit;
the second output end of the first logic unit and the second output end of the second logic unit are connected with the first input end and the second input end of the OR logic unit, and the output end of the OR logic unit outputs an unloading instruction.
2. The nuclear power plant diesel generator set unloading order generating apparatus according to claim 1, wherein the first logic unit includes:
the first special logic processing module is used for receiving signals acquired by the first input end of the first logic unit, and outputting first output signals after logic processing;
the first three-out-of-two logic voting module is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the first three-out-of-two logic voting module is connected with the output end of the first special logic processing module, the second input end of the first three-out-of-two logic voting module is connected with the first output end of the second logic unit, the third input end of the first three-out-of-two logic voting module is connected with the output end of the third logic unit, and the output end of the first three-out-of-two logic voting module is connected with the first input end of the OR logic unit;
the second logic unit includes:
the second special logic processing module is used for receiving the signals acquired by the first input end of the second logic unit, and outputting first output signals after logic processing;
the second 'three-out-of-two' logic voting module is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the second 'three-out-of-two' logic voting module is connected with the output end of the second special logic processing module, the second input end of the second 'three-out-of-two' logic voting module is connected with the first output end of the first logic unit, the third input end of the second 'three-out-of-two' logic voting module is connected with the output end of the third logic unit, and the output end of the second 'three-out-of-two' logic voting module is connected with the second input end of the OR logic unit;
the third logic unit includes:
the third special logic processing module is used for receiving the signal acquired by the first input end of the third logic unit, and outputting a network communication signal after logic processing.
3. The unloading command generating device for a diesel generator set of a nuclear power plant according to claim 2, wherein the network communication interface of the first logic unit, the network communication interface of the second logic unit and the network communication interface of the third logic unit are connected through a peer-to-peer network communication;
the second input end of the first logic unit is connected with the first output end of the second logic unit through hard wiring;
the second input of the second logic unit is connected to the first output of the first logic unit by hard wiring.
4. The unloading command generating device for the diesel generator set of the nuclear power plant according to claim 2, wherein the first logic unit/the second logic unit is provided with two DO interfaces, two DI interfaces and 1 COM interface;
the third logic unit is provided with 1 DI interface and 1 COM interface.
5. A method for generating a nuclear power plant diesel generator set unloading order, characterized in that the method comprises:
receiving an unloading signal output by an alternating current emergency power distribution system;
isolating the unloading signals and dividing the unloading signals into three paths of unloading signals;
carrying out logic processing on the unloading signal to generate a first input signal of a logic voting module;
carrying out logic processing on the unloading signal to generate a second input signal of the logic voting module;
carrying out logic processing on the unloading signal to generate a third input signal of the logic voting module;
performing 'two-out-of-three' logic voting on a first input signal, a second input signal and a third input signal of a logic voting module of the first logic unit, and outputting an output signal of the first logic unit;
performing 'two-out-of-three' logic voting on the first input signal, the second input signal and the third input signal of the logic voting module of the second logic unit again, and outputting an output signal of the second logic unit;
and performing OR logic operation on the output signal of the first logic unit and the output signal of the second logic unit, and outputting an unloading instruction.
6. The method for generating unloading instructions of a diesel generator set in a nuclear power plant according to claim 5, wherein the method for performing a "two-out-of-three" logical vote is as follows:
judging whether the quality bits of the first input signal, the second input signal and the third input signal are valid or not respectively;
if the number of the effective input signals is 3 and the voting logic is 2/3, the quality bits of the output signals are effective;
if the number of the effective input signals is 2 and the voting logic is 1/2, the quality bits of the output signals are effective;
if the number of the effective input signals is 1 and the voting logic is 1/1, the quality bits of the output signals are effective;
if the number of valid input signals is 0, the quality bits of the output signal are not valid.
7. The method for generating the unloading command of the diesel generator set of the nuclear power plant according to claim 5, comprising:
the isolation distribution unit receives an unloading signal output by the alternating current emergency power distribution system, isolates the unloading signal, divides the unloading signal into three paths of unloading signals and inputs the three paths of unloading signals to the first logic unit, the second logic unit and the third logic unit respectively;
the first special logic processing unit performs logic processing on the unloading signal to generate a first input signal;
the second special logic processing unit performs logic processing on the unloading signal to generate a second input signal;
the third special logic processing unit performs logic processing on the unloading signal to generate a third input signal;
inputting a first input signal, a second input signal and a third input signal into a first three-out-of-two logic voting module, carrying out three-out-of-two logic voting, and outputting a first output signal;
inputting the first input signal, the second input signal and the third input signal into a second 'two-out-of-three' logic voting module, carrying out 'two-out-of-three' logic voting, and outputting a second output signal;
the first output signal and the second output signal are input into an OR logic unit, OR logic operation is carried out, and an unloading instruction is output.
8. The method for generating unloading instructions of diesel generator set in nuclear power plant according to claim 7, wherein the unloading instructions output by the or logic unit are sent to a priority processing module connected with electric equipment.
9. The method for generating unloading instructions of diesel generator set in nuclear power plant according to claim 7, wherein the first dedicated logic processing unit/the second dedicated logic processing unit/the third dedicated logic processing unit is configured to latch signal output by default when the first dedicated logic processing unit/the second dedicated logic processing unit/the third dedicated logic processing unit fails.
10. The method for generating unloading instructions of a diesel generator set in a nuclear power plant according to claim 7, wherein the first logic unit and the second logic unit have the same structure, and the logic voting methods of the first logic unit and the second logic unit are the same.
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