Nuclear power plant diesel generator start-up control method and system

Abstract

The present application relates to a nuclear power plant diesel generator joint start control method and system, which is applied to a nuclear power plant diesel generator joint start control system, the system comprising: a local unit, an adjacent unit and corresponding LLS system diesel generator set; the LLS system diesel generator sets of the two units are standby for each other; the method comprising: outputting an automatic start signal under the condition of power failure of the nuclear power plant; the local unit diesel generator set and the adjacent unit diesel generator set start according to the automatic start signal using any one mode of a first start mode, a second start mode and a third start mode, and output a start success signal; the diesel generator set outlet circuit breaker receives the start success signal and performs the action of closing; the water pressure test pump starts and injects water to the main pump shaft seal. The diesel engines of the two units can be standby for each other, effectively solving the defect of single unit standby mode, and when the local unit fails to start, the adjacent unit diesel engine can be automatically switched, improving the system reliability.

Description

Technical Field

[0001] This invention relates to the field of emergency control in nuclear power plants, and more specifically, to a method and system for controlling the start-up of diesel generators in nuclear power plants. Background Technology

[0002] In the event of a complete power outage at the nuclear power plant, the LLS (water pressure test pump) diesel generator set of this unit will be started first to supply power to the auxiliary system and downstream loads of the LLS system. The LLS turbine generator set of this unit will serve as a backup for the LLS diesel generator set, starting when the diesel generator set fails to start, and will be able to ensure the supply of main pump shaft seal water within a specified time.

[0003] However, the current emergency response model has the following problems: I. Defects of the single-unit standby mode: When the diesel engine fails to start, only the turbine generator of the same unit can be started. However, the turbine generator requires a steam supply, resulting in a start-up delay. Furthermore, there is no interconnection logic between the diesel engines of the two units, leading to a lack of standby capability when a single unit fails. II. System reliability bottleneck: The diesel engine has a high start-up failure rate, and an automatic switching mechanism for the diesel engines of the trusted units has not been established. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and system for controlling the start-up of diesel generators in nuclear power plants, addressing the problems existing in the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct a joint start-up control method for diesel generators in nuclear power plants, applied to a joint start-up control system for diesel generators in nuclear power plants. The joint start-up control system includes: the original unit, adjacent units, the original unit's LLS system diesel generator set, and the adjacent unit's LLS system diesel generator set; the original unit's LLS system diesel generator set and the adjacent unit's LLS system diesel generator set serve as backups for each other; the joint start-up control method for diesel generators includes: Step S10: In the event of a complete power outage at the nuclear power plant, output an automatic start signal; Step S20: The diesel generator set of the LLS system of the local unit and the diesel generator set of the LLS system of the adjacent unit start according to the automatic start signal using any one of the first start mode, the second start mode and the third start mode, and output a start success signal; The first start-up mode is: if the diesel generator set of the LLS system of this unit fails to start after two attempts, start the diesel generator set of the LLS system of the adjacent unit; The second starting mode is: starting the local unit's LLS system diesel generator set once; The third starting mode is: starting the LLS system diesel generator set of this unit twice; Step S30: The diesel generator set outgoing circuit breaker receives the start success signal and performs the action of closing the circuit; Step S40: Start the water pressure test pump and inject water into the main pump shaft seal.

[0006] In the nuclear power plant diesel generator start-up control method of the present invention, if it is the first start-up mode, then step S20 includes: If the diesel generator set of the LLS system of this unit starts and fails twice in a row, the diesel generator set of the LLS system of this unit will trigger a start failure signal. If the diesel generator set of the LLS system of this unit is in remote control mode, the diesel generator set of the LLS system of the adjacent unit will be started automatically.

[0007] In the nuclear power plant diesel generator joint start-up control method of the present invention, the automatic start-up of the adjacent unit LLS system diesel generator set includes: The adjacent unit's LLS system diesel generator set was automatically started for the first time. Detect the real-time voltage and speed of the diesel generator set in the adjacent unit's LLS system; If the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then it is determined that the adjacent unit's LLS system diesel generator set has started successfully on the first attempt, and a start success signal is output. Alternatively, the automatic start-up of the adjacent unit LLS system diesel generator set includes: The adjacent unit's LLS system diesel generator set was automatically started for the first time. If the first automatic startup fails, the second startup will be executed. If the second start is successful, and the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then it is determined that the adjacent unit's LLS system generator set has started successfully twice, and a start success signal is output.

[0008] In the nuclear power plant diesel generator start-up control method of the present invention, if it is the second start-up mode, then step S20 includes: Start the LLS system diesel generator set of this unit in one go; Detect the real-time voltage and speed of the diesel generator set in the LLS system of this unit; If the real-time voltage and speed of the LLS system diesel generator set of the unit reach the rated voltage and speed, it is determined that the LLS system diesel generator set of the unit has started successfully on the first attempt, and a start success signal is output.

[0009] In the nuclear power plant diesel generator start-up control method of the present invention, if it is the third start-up mode, then step S20 includes: First start of the unit's LLS system diesel generator set; If the first startup fails, the second startup will proceed. If the second start is successful, and the real-time voltage and speed of the LLS system diesel generator set of this unit reach the rated voltage and speed, then it is determined that the LLS system diesel generator set of this unit has started successfully twice, and a start success signal is output.

[0010] The nuclear power plant diesel generator start-up control method described in this invention also includes: When the LLS system diesel generator set of this unit is in remote control mode, the local mode signal contact of the start-stop logic of the LLS system diesel generator set of the adjacent unit is in the open state. When the diesel generator set of the LLS system of this unit is in local mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the closed state.

[0011] The nuclear power plant diesel generator start-up control method described in this invention also includes: If the LLS system diesel generator set of the aforementioned unit malfunctions, the following operations shall be performed before performing fault repair on the LLS system diesel generator set of the aforementioned unit: Set the selector switch of the LLS system diesel generator set of this unit to local mode; Alternatively, the connection to the start failure signal contact of the diesel generator set in the LLS system of the adjacent unit can be locked.

[0012] This invention also provides a nuclear power plant diesel generator start-up control system, applied to the above-described nuclear power plant diesel generator start-up control method, comprising: The nuclear power plant diesel generator joint start-up control system includes: the current unit, the adjacent unit, the diesel generator set of the current unit's LLS system, and the diesel generator set of the adjacent unit's LLS system; the diesel generator set of the current unit's LLS system and the diesel generator set of the adjacent unit's LLS system serve as backups for each other. If the diesel generator set of the local unit's LLS system triggers a start failure signal and the diesel generator set of the local unit's LLS system is in remote control mode, then the diesel generator set of the adjacent unit's LLS system will be started automatically.

[0013] In the nuclear power plant diesel generator joint start control system described in this invention, when the diesel generator set of the LLS system of the unit is in remote control mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the open state. When the diesel generator set of the LLS system of this unit is in local mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the closed state.

[0014] In the nuclear power plant diesel generator joint start control system described in this invention, if the local unit's LLS system diesel generator set fails, the transfer switch of the local unit's LLS system diesel generator set is set to local mode before performing fault repair on the local unit's LLS system diesel generator set. Alternatively, if the LLS system diesel generator set of the unit fails, the start failure signal contact of the LLS system diesel generator set of the adjacent unit shall be locked before the fault repair of the LLS system diesel generator set of the unit is performed.

[0015] The nuclear power plant diesel generator joint start-up control method and system of the present invention have the following beneficial effects: The method includes: outputting an automatic start signal under the condition of a complete power outage of the nuclear power plant; the diesel generator set of this unit and the diesel generator set of the adjacent unit start according to the automatic start signal using any one of the first start mode, the second start mode, and the third start mode, and outputting a start-up success signal; the outgoing circuit breaker of the diesel generator set receives the start-up success signal and performs the action of closing the circuit; the water pressure test pump starts and injects water into the main pump shaft seal. The diesel generators of the two units of the present invention can serve as backups for each other, effectively solving the defects of the single-unit backup mode, and can automatically switch to the diesel generator of the adjacent unit when the start-up of the current unit fails, improving system reliability. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a flowchart illustrating the joint start-up control method for diesel generators in nuclear power plants provided by the present invention. Figure 2 This is a timing diagram of the nuclear power plant diesel generator start-up control method provided by the present invention; Figure 3 This is a schematic diagram of the start-stop principle of the LLS diesel generator provided by the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To address the problems of traditional solutions, this invention provides a method for the joint start-up control of diesel generators in nuclear power plants. This method can automatically start the diesel generators of an adjacent unit after the original unit's diesel generator fails to start, providing main pump shaft sealing water within a specified time. This method is applied to the joint start-up control system of nuclear power plant diesel generators. The joint start-up control system includes: the original unit, an adjacent unit, the original unit's LLS system diesel generators, and the adjacent unit's LLS system diesel generators; the original unit's LLS system diesel generators and the adjacent unit's LLS system diesel generators serve as backups for each other.

[0019] refer to Figure 1 In a preferred embodiment, the diesel generator start-up control method includes the following steps: Step S10: In the event of a complete power outage at the nuclear power plant, output an automatic start signal.

[0020] Specifically, the power outage conditions of the entire nuclear power plant include: the simultaneous loss of power of the entire LAH system (6.6kV A-line emergency AC bus system) and LHB system (6.6kV B-line emergency AC bus system) for 15 seconds. At this time, an automatic start signal is triggered, which starts the diesel generator set of the unit's LLS system.

[0021] Step S20: The diesel generator set of this unit's LLS system and the diesel generator set of the adjacent unit's LLS system start according to the automatic start signal, using any one of the first start mode, the second start mode, and the third start mode, and output a start success signal.

[0022] The first starting mode is: if the diesel generator set of the local unit's LLS system fails to start after two attempts, the diesel generator set of the adjacent unit's LLS system will be started; the second starting mode is: the diesel generator set of the local unit's LLS system will be started once; the third starting mode is: the diesel generator set of the local unit's LLS system will be started twice.

[0023] It should be noted that both the second and third start-up modes are start-up modes in which the diesel generator set of the local unit's LLS system can be successfully started, and there is no issue of the local unit's diesel generator set failing to start. When the local unit's diesel generator set fails to start (i.e., the first start-up mode), in the traditional solution, due to the lack of interconnection logic between the two units' diesel generators, the backup capability is lost when a single unit fails. This invention eliminates the two units' LLS turbine generator sets and their auxiliary equipment in the nuclear power plant, and modifies the control logic of the two units' LLS system diesel generator sets, making the two units' LLS system diesel generator sets mutually redundant. Therefore, under the condition of a plant-wide power outage, when the local unit's LLS system diesel generator set fails to start, the adjacent unit's LLS system diesel generator set is automatically started, providing main pump shaft sealing water within a specified time to ensure and enhance the unit's nuclear safety.

[0024] In some embodiments, if it is the first start-up mode, step S20 includes: if the diesel generator set of the local unit's LLS system fails to start twice in a row, the diesel generator set of the local unit's LLS system triggers a start-up failure signal; if the diesel generator set of the local unit's LLS system is in remote control mode, the diesel generator set of the adjacent unit's LLS system is automatically started.

[0025] The automatic starting of the adjacent unit's LLS system diesel generator set includes: first, automatically starting the adjacent unit's LLS system diesel generator set; detecting the real-time voltage and speed of the adjacent unit's LLS system diesel generator set; if the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then the adjacent unit's LLS system diesel generator set is considered to have started successfully on the first attempt, and a start success signal is output. Alternatively, the automatic starting of the adjacent unit's LLS system diesel generator set includes: first, automatically starting the adjacent unit's LLS system diesel generator set; if the first automatic start fails, then a second start is performed; if the second start is successful, and the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then the adjacent unit's LLS system diesel generator set is considered to have started successfully on both attempts, and a start success signal is output.

[0026] Specifically, when the local unit's LLS system diesel generator set receives a remote start command (i.e., an automatic start signal), if the local unit's LLS system diesel generator set fails to start after two consecutive attempts, the voltage of the local unit's LLS system diesel generator set is abnormal, triggering a start failure signal. If the local unit is in remote control mode at this time, the adjacent unit's LLS diesel generator set will be started automatically.

[0027] If it is the second start mode, step S20 includes: starting the local unit's LLS system diesel generator set once; detecting the real-time voltage and speed of the local unit's LLS system diesel generator set; if the real-time voltage and speed of the local unit's LLS system diesel generator set reach the rated voltage and speed, then it is determined that the local unit's LLS system diesel generator set has started successfully once, and a start success signal is output.

[0028] If it is the third start mode, step S20 includes: starting the local unit's LLS system diesel generator set for the first time; if the first start fails, continue to perform the second start; if the second start is successful, and the real-time voltage and speed of the local unit's LLS system diesel generator set reach the rated voltage and speed, then it is determined that the local unit's LLS system diesel generator set has started successfully twice, and a start success signal is output.

[0029] The timing of the three startup modes is as follows: Figure 2 As shown.

[0030] Step S30: The diesel generator set outgoing circuit breaker receives the start-up success signal and performs the action of closing the circuit.

[0031] Step S40: Start the water pressure test pump and inject water into the main pump shaft seal.

[0032] Furthermore, in this embodiment of the invention, when the diesel generator set of the local unit's LLS system is in remote control mode, the local mode signal contact of the start / stop logic of the diesel generator set of the adjacent unit's LLS system is connected (in series) (see...). Figure 3 Relays 2 / 1 and 2) are in the open state. When the diesel generator set of this unit's LLS system is in local mode, the local mode signal contact of the start / stop logic of the adjacent unit's LLS system diesel generator set is connected (in series) (see...). Figure 3 Relays 2 / 1 and 2) are in the closed state. The local / remote control mode of the diesel generator set is switched by a changeover switch on the local control cabinet. When the changeover switch is set to remote control mode, the diesel generator set is in remote control mode; when the changeover switch is set to local mode, the diesel generator set is in local mode.

[0033] Furthermore, in this embodiment of the invention, if the diesel generator set of the local unit's LLS system malfunctions, the following operations are performed before performing fault repair on the local unit's LLS system diesel generator set: the transfer switch of the local unit's LLS system diesel generator set is placed in local mode; or, the connection to the start-failure signal contact of the adjacent unit's LLS system diesel generator set is locked. This setting enables safety protection for the diesel generator sets. That is, before performing fault repair on the local unit's diesel generator set, the transfer switch of the faulty diesel generator set can be placed in local mode, or the connection to the start-failure signal contact of the adjacent unit's diesel generator set can be locked (see...). Figure 3(3 and 4). Both of these methods can lock out the starting logic of the diesel generator of the adjacent unit. In specific applications, the appropriate method can be selected based on the maintenance conditions.

[0034] The present invention also provides a nuclear power plant diesel generator start-up control system, which is applied to the nuclear power plant diesel generator start-up control method disclosed in the present invention.

[0035] Specifically, the nuclear power plant diesel generator joint start-up control system of the present invention includes: the current unit, an adjacent unit, the current unit's LLS system diesel generator set, and the adjacent unit's LLS system diesel generator set; the current unit's LLS system diesel generator set and the adjacent unit's LLS system diesel generator set serve as backups for each other. If the current unit's LLS system diesel generator set triggers a start-up failure signal, and the current unit's LLS system diesel generator set is in remote control mode, then the adjacent unit's LLS system diesel generator set will be automatically started.

[0036] In some embodiments, when the diesel generator set of the local unit's LLS system is in remote control mode, the local mode signal contact of the start-stop logic of the diesel generator set of the adjacent unit's LLS system is in an open state; when the diesel generator set of the local unit's LLS system is in local mode, the local mode signal contact of the start-stop logic of the diesel generator set of the adjacent unit's LLS system is in a closed state.

[0037] In this embodiment of the invention, if the diesel generator set of the local unit's LLS system malfunctions, the transfer switch of the local unit's LLS system diesel generator set is set to local mode before performing fault repair on the local unit's LLS system diesel generator set; or, if the diesel generator set of the local unit's LLS system malfunctions, the start failure signal contact of the adjacent unit's LLS system diesel generator set is locked before performing fault repair on the local unit's LLS system diesel generator set.

[0038] Specifically, to address the issues of lack of backup capacity in the event of a single unit failure due to the absence of interconnection logic between the diesel generators of the two units in traditional nuclear power plants, and the lack of an automatic switching mechanism for diesel generators of adjacent units, this invention eliminates the LLS turbine generator sets and their auxiliary equipment of the two units in a nuclear power plant. It modifies the control logic of the diesel generator sets in the LLS systems of the two units, enabling the diesel generator sets in the LLS systems of the two units to serve as backups for each other. In the event of a plant-wide power outage, the diesel generator set in the local unit's LLS system starts, supplying power to the auxiliary systems and downstream loads of the LLS system. If the diesel generator set in the local unit fails to start, the diesel generator set of the adjacent unit starts, providing main pump shaft sealing water within a specified time (2 minutes).

[0039] The start / stop logic change in this invention is achieved by modifying the hard wiring of the relay. The specific implementation principle is as follows: The control principle of column A of the 1LLS diesel generator is used as an example for explanation (the principle of column B is the same).

[0040] 1LLS001EY1 indicates the start signal for the diesel generator in column A. When the diesel generator is stopped, the contacts close; when the contacts open, a start signal is sent. The logic of this invention is as follows: Figure 3 The local mode signal contacts (relays 2 / 1, 2) of adjacent units and the start-up failure feedback signal contacts of adjacent units are connected in series into the start-up and stop logic circuit of the diesel generator of this unit (3, 4). The start-up and stop logic of the main control and the whole plant remains unchanged (relays 1 / 1, 2). The specific analysis of the modified logic part of this invention is as follows. The impact of the start-up and stop logic analyzed below only applies to the original state: 1. If there is no start failure signal from the adjacent unit and the adjacent unit is in local mode, contacts (3, 4) are closed and contacts (relays 2 / 1, 2) are closed, and the start / stop logic is not affected; 2. If there is no start failure signal from the adjacent unit and the adjacent unit is in remote control mode, contacts (3, 4) are closed and contacts (relays 2 / 1, 2) are open, and the start / stop logic is not affected; 3. If an adjacent unit has a start-up failure signal or is in local mode, contacts (3, 4) are open and contacts (relays 2 / 1, 2) are closed, and the start-up / stop logic is not affected; 4. If an adjacent unit fails to start or is in remote control mode, contacts (3, 4) and (relays 2 / 1, 2) will open, and contact 1LLS001EY1 will open, triggering the start signal of the diesel generator in column A.

[0041] This invention innovatively introduces a more reliable diesel generator from an adjacent unit as a backup for the diesel generator of this unit; when the diesel generator of this unit fails to start and this unit is in remote control mode, the diesel generator of the adjacent unit is automatically started to provide the main pump shaft sealing water within a specified time, thereby ensuring and improving the nuclear safety of the unit.

[0042] Meanwhile, before troubleshooting a diesel generator: ① Set the corresponding diesel generator set transfer switch to local mode; ② Lock the connection to the start failure signal contact of the adjacent diesel generator. Either ① or ② can lock the start logic of the adjacent diesel engine. Determine the appropriate method based on the maintenance conditions.

[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0044] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0045] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for controlling the start-up of a diesel generator in a nuclear power plant, applied to the start-up control system of a diesel generator in a nuclear power plant, characterized in that, The nuclear power plant diesel generator joint start-up control system includes: the current unit, adjacent units, the current unit's LLS system diesel generator set, and the adjacent unit's LLS system diesel generator set; the current unit's LLS system diesel generator set and the adjacent unit's LLS system diesel generator set serve as backups for each other; the diesel generator joint start-up control method includes: Step S10: In the event of a complete power outage at the nuclear power plant, output an automatic start signal; Step S20: The diesel generator set of the LLS system of the local unit and the diesel generator set of the LLS system of the adjacent unit start according to the automatic start signal using any one of the first start mode, the second start mode and the third start mode, and output a start success signal; The first start-up mode is: if the diesel generator set of the LLS system of this unit fails to start after two attempts, start the diesel generator set of the LLS system of the adjacent unit; The second starting mode is: starting the local unit's LLS system diesel generator set once; The third starting mode is: starting the LLS system diesel generator set of this unit twice; Step S30: The diesel generator set outgoing circuit breaker receives the start success signal and performs the action of closing the circuit; Step S40: Start the water pressure test pump and inject water into the main pump shaft seal.

2. The method for joint start-up control of a nuclear power plant diesel generator according to claim 1, characterized in that, If it is the first startup mode, then step S20 includes: If the diesel generator set of the LLS system of this unit starts and fails twice in a row, the diesel generator set of the LLS system of this unit will trigger a start failure signal. If the diesel generator set of the LLS system of this unit is in remote control mode, the diesel generator set of the LLS system of the adjacent unit will be started automatically.

3. The method for joint start-up control of a nuclear power plant diesel generator according to claim 2, characterized in that, The automatic start-up of adjacent unit LLS system diesel generator sets includes: The adjacent unit's LLS system diesel generator set was automatically started for the first time. Detect the real-time voltage and speed of the diesel generator set in the adjacent unit's LLS system; If the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then it is determined that the adjacent unit's LLS system diesel generator set has started successfully on the first attempt, and a start success signal is output. Alternatively, the automatic start-up of the adjacent unit LLS system diesel generator set includes: The adjacent unit's LLS system diesel generator set was automatically started for the first time. If the first automatic startup fails, the second startup will be executed. If the second start is successful, and the real-time voltage of the adjacent unit's LLS system diesel generator set reaches the rated voltage and speed, then it is determined that the adjacent unit's LLS system generator set has started successfully twice, and a start success signal is output.

4. The method for joint start-up control of a nuclear power plant diesel generator according to claim 2, characterized in that, If it is the second startup mode, then step S20 includes: Start the LLS system diesel generator set of this unit in one go; Detect the real-time voltage and speed of the diesel generator set in the LLS system of this unit; If the real-time voltage and speed of the LLS system diesel generator set of the unit reach the rated voltage and speed, it is determined that the LLS system diesel generator set of the unit has started successfully on the first attempt, and a start success signal is output.

5. The method for joint start-up control of a nuclear power plant diesel generator according to claim 1, characterized in that, If it is the third startup mode, then step S20 includes: First start of the unit's LLS system diesel generator set; If the first startup fails, the second startup will proceed. If the second start is successful, and the real-time voltage and speed of the LLS system diesel generator set of this unit reach the rated voltage and speed, then it is determined that the LLS system diesel generator set of this unit has started successfully twice, and a start success signal is output.

6. The method for joint start-up control of a nuclear power plant diesel generator according to claim 1, characterized in that, Also includes: When the LLS system diesel generator set of this unit is in remote control mode, the local mode signal contact of the start-stop logic of the LLS system diesel generator set of the adjacent unit is in the open state. When the diesel generator set of the LLS system of this unit is in local mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the closed state.

7. The method for joint start-up control of a nuclear power plant diesel generator according to claim 1, characterized in that, Also includes: If the LLS system diesel generator set of the aforementioned unit malfunctions, the following operations shall be performed before performing fault repair on the LLS system diesel generator set of the aforementioned unit: Set the selector switch of the LLS system diesel generator set of this unit to local mode; Alternatively, the connection to the start failure signal contact of the diesel generator set in the LLS system of the adjacent unit can be locked.

8. A nuclear power plant diesel generator start-up control system, applied to the nuclear power plant diesel generator start-up control method according to any one of claims 1-7, characterized in that, include: The nuclear power plant diesel generator joint start-up control system includes: the current unit, the adjacent unit, the diesel generator set of the current unit's LLS system, and the diesel generator set of the adjacent unit's LLS system. The LLS system diesel generator set of this unit is a backup to the LLS system diesel generator set of the adjacent unit; If the diesel generator set of the local unit's LLS system triggers a start failure signal and the diesel generator set of the local unit's LLS system is in remote control mode, then the diesel generator set of the adjacent unit's LLS system will be started automatically.

9. The nuclear power plant diesel generator start-up control system according to claim 8, characterized in that, When the diesel generator set of the LLS system of the unit is in remote control mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the open state. When the diesel generator set of the LLS system of this unit is in local mode, the local mode signal contact of the start-stop logic of the diesel generator set of the LLS system of the adjacent unit is in the closed state.

10. The nuclear power plant diesel generator start-up control system according to claim 8, characterized in that, If the diesel generator set of the LLS system of the local unit fails, the transfer switch of the diesel generator set of the LLS system of the local unit shall be set to local mode before the fault repair is performed on the diesel generator set of the LLS system of the local unit. Alternatively, if the LLS system diesel generator set of the unit fails, the start failure signal contact of the LLS system diesel generator set of the adjacent unit shall be locked before the fault repair of the LLS system diesel generator set of the unit is performed.

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