Simulation analysis system and method for light-weight power-loss consequence of nuclear power unit

Abstract

The invention relates to the field of nuclear power unit logic simulation and decision support, in particular to a nuclear power unit lightweight power-loss consequence simulation analysis system and method.The system comprises an electrical node module, a logic judgment module and a simulation analysis module, and the electrical node module constructs an electrical node model; carrying out attribute definition and electrified logic relation definition on the electrical nodes; the logic judgment module performs logic judgment and judges the state of the electrical node; and when the simulation analysis module receives the power-loss signal of the electrical node, querying a downstream electrical node of the power-loss electrical node, transmitting the power-loss signal to the downstream electrical node, carrying out logical judgment on the power-loss electrical node and the downstream electrical node, and giving the power-loss condition of the downstream electrical node according to a judgment result. According to the invention, simulation analysis is carried out on the power loss fault of the nuclear power plant through the simulation analysis module, an authorized user can carry out simulation operation through the Internet, and the flexibility and simulation efficiency of the simulation system are improved.

Description

Technical Field

[0001] The invention relates to the field of logic simulation and decision support for nuclear power units, and in particular to a lightweight power failure consequence simulation analysis system and method for nuclear power units. Background Art

[0002] The power supply system of nuclear power units is extremely complex, with many electrical load devices of different types and levels. In particular, the instrumentation and control system, as the control center of nuclear power plants, plays a key role in the operation control and protection of nuclear power units. Events such as power failure of 48V and 110V instruments and control power supplies, and power failure of 220V protection group power supplies in nuclear power units often lead to major changes in the operating status of the units. If the impact scope of accidental power failure is not clear and the risk analysis of the event is insufficient, it may affect the handling of the accident and even cause the unit to shut down by mistake.

[0003] In the prior art, training and drills for power outage accident scenarios of nuclear power units are mainly implemented through simulators. Relying on the heavy simulation model, the simulator basically reproduces the physical processes of the key systems and subsystems of the nuclear power unit, including the thermal hydraulic system, electrical system, control system, and safety system. However, the simulator has the limitations of large computing resource consumption, relatively low efficiency, and can only be deployed on-site and accessed by a single machine. For power outages of the unit, the simulator only simulates the power outage of some electrical systems or equipment at 380V level and above, and does not analyze the consequences and provide text prompts to assist in decision-making. Summary of the invention

[0004] The present invention provides a lightweight power failure consequence simulation analysis system and method for a nuclear power unit, which are used to solve the problems in the prior art that power failure accident scenario simulation of a nuclear power unit is too complicated, and can only simulate part of the electrical system, the simulation cannot perform result analysis and lacks auxiliary decision-making functions.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention proposes a lightweight power failure consequence simulation and analysis system for a nuclear power unit, the system comprising an electrical node module, a logic judgment module and a simulation analysis module, the electrical node module constructs an electrical node model according to electrical elements and their connection relationships in an electrical primary system, and defines attributes and energized logical relationships for the electrical nodes; the logic judgment module performs logic judgment according to the energized logical relationships of the electrical nodes to determine the state of the electrical nodes; when receiving a power failure signal of the electrical node, the simulation analysis module queries the downstream electrical nodes of the power failure electrical node and transmits the power failure signal to the downstream electrical node, performs logic judgment on the power failure electrical node and the downstream electrical node through the logic judgment module, and gives the power failure status of the downstream electrical node according to the judgment result.

[0007] In some embodiments, the electrical node includes a bus, a switch, and an equipment load, and the attribute definition of the electrical node includes: basic information, physical connection relationship, and power failure fault processing decision information.

[0008] In some embodiments, the energized logic relationship definition of the switch includes two logic signals: opening and closing. The opening logic signal includes: manual opening signal or slow-cutting device opening signal; low voltage protection signal; the switch loses its own control power, and whether to define the opening logic signal is determined based on the type of switch; receiving an automatic switching or tripping protection signal from the equipment load powered by the switch; the closing logic signal of the switch includes: manual closing or slow-cutting device closing; automatic switching or other start-up signals from the equipment load powered by the switch.

[0009] In some embodiments, the busbar's energized logical relationship definition includes two logical signals: energized and de-energized. The busbar energized logical signal is defined as follows: if any busbar supplying power to the busbar is energized and the switch on the energized busbar is in the closed state, the busbar is energized; otherwise, the busbar is defined as a de-energized logical signal; the equipment load's energized logical relationship definition includes two logical signals: energized and de-energized. The equipment load energized logical signal is defined as follows: if the busbar supplying power to the equipment load is energized and the switch on the energized busbar is closed, the equipment load is energized; otherwise, the equipment load is de-energized.

[0010] In some embodiments, the electrical node module stores the attribute definition and energized logical relationship definition data of the electrical node in a redis database.

[0011] In some embodiments, the electrical node power-off signal received by the simulation and analysis module is specifically to open or close the switch; after receiving the electrical node power-off signal, the simulation and analysis module queries the data of all electrical nodes downstream of the switch, and transmits the switch power-off signal to all downstream electrical nodes; the simulation and analysis module performs logical judgment on the power-off electrical node and the downstream electrical node through the logic judgment module, specifically including: the simulation and analysis module determines whether the switch that sends the power-off signal is set with delay logic, determines the status of the interlocking switch of the switch, and determines the status of the electrical nodes of the downstream switch, busbar and equipment load.

[0012] In some embodiments, the electrical node module receives the results of the logical judgment of the power-off electrical node and the downstream electrical node from the simulation analysis module, and uses different colors to indicate the equipment load affected by the power-off signal; the simulation analysis module feeds back to the user the power-off fault handling decision information and basic information of the equipment load affected by the power-off signal.

[0013] In some embodiments, the simulation analysis module is further provided with a knowledge and experience module, which grades the importance of the equipment loads, automatically sorts the equipment loads affected by the power failure signal according to the importance grades, and provides feedback to the user.

[0014] The present invention proposes a lightweight power failure consequence simulation analysis method for a nuclear power unit, the method comprising:

[0015] Step 1: Build electrical node models of busbars, switches, and equipment loads;

[0016] Step 1.1: The electrical node module builds an electrical node model according to the electrical components and their connection relationships in the electrical primary system;

[0017] Step 1.2: Define the attributes and energized logical relationships of electrical nodes;

[0018] Step 2: Conduct simulation of the consequences of power outage.

[0019] Step 2.1: The simulation analysis module uses the opening or closing of the switch as a power-off signal, queries the data of all electrical nodes downstream of the switch, and transmits the power-off signal to all electrical nodes downstream;

[0020] Step 2.2: The simulation analysis module performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module;

[0021] Step 3: Conduct power outage consequence analysis;

[0022] Step 3.1: The electrical node module uses different colors to indicate the equipment load affected by the power failure signal according to the logical judgment result of the simulation analysis module;

[0023] Step 3.2: The simulation analysis module feeds back to the user the attribute definition information of the equipment load affected by the switch power failure signal;

[0024] Step 3.3: The knowledge and experience module of the simulation analysis module ranks the equipment loads affected by the power failure signal according to the importance level and provides feedback to the user.

[0025] In some embodiments, the attribute definition of the electrical node in step 1.2 includes: basic information, physical connection relationship, and power failure fault handling decision information; the energized logical relationship definition of the electrical node includes: the closing and opening logic signals of the switch; the energized and de-energized logic signals of the bus; the energized and de-energized logic signals of the equipment load; the attribute definition of the electrical node and the energized logical relationship definition data are stored in the redis database.

[0026] In some embodiments, step 2.1 queries the data of all electrical nodes downstream of the switch, specifically: use a depth-first search algorithm to traverse the electrical nodes downstream of the switch in sequence, and convert the traversed downstream electrical node data into json format, and store it in a redis database; then read the downstream electrical node json data from the redis database and convert it into electrical node data.

[0027] In some embodiments, the simulation analysis module in step 2.2 performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module, specifically including:

[0028] Step 2.2.1: The simulation analysis module reads the energized logic relationship definition of the switch that sends the power-off signal from the redis database;

[0029] Step 2.2.2: The simulation analysis module determines whether the switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determines whether the switch is restored to the original state, and stores the switch state in the redis database;

[0030] Step 2.2.3: If the switch does not return to its original state, the simulation analysis module queries the redis database to see whether the switch has an interlock switch, and determines the state of the interlock switch of the switch;

[0031] Step 2.2.4: The simulation analysis module determines the status of the electrical nodes of the downstream switches, busbars and equipment loads through the logic judgment module.

[0032] In some embodiments, determining the state of the interlocking switch of the switch in step 2.2.3 specifically includes: determining whether the interlocking switch meets the opening or closing conditions and whether the delay logic is set through a logic judgment module, determining the state of the interlocking switch, and storing the state of the interlocking switch in the redis database.

[0033] In some embodiments, the simulation analysis module in step 2.2.4 determines the status of the electrical nodes of the downstream switches, busbars and equipment loads through the logic judgment module, specifically including: for the downstream switches, the logic judgment module is used to determine whether the downstream switches meet the opening or closing conditions and whether the delay logic is set, and the downstream switch status is determined, and the downstream switch status is stored in the redis database; for the downstream busbar, the upstream incoming line relationship of the downstream busbar is queried through the redis database, and the logic judgment module is used to determine whether the downstream busbar is energized, and the downstream busbar status is stored in the redis database; for the downstream equipment load, the upstream incoming line relationship of the downstream equipment load is queried through an upward scan, and the logic judgment module is used to determine whether the downstream equipment load is energized, and the downstream equipment load status is stored in the redis database.

[0034] The implementation of the present invention has the following beneficial effects

[0035] 1. The present invention proposes a lightweight power failure consequence simulation analysis system and method for nuclear power units. The system builds a streamlined electrical node model for the decision data information that users need to obtain during power failure of the unit, and simulates and analyzes power failures in nuclear power plants through simulation analysis modules. Authorized users can perform simulation operations through the Internet, which improves the flexibility and efficiency of the simulation system.

[0036] 2. The present invention proposes a lightweight power failure consequence simulation analysis system and method for nuclear power units. The present invention has a wider range of simulations for power failure fault scenarios of nuclear power units and a more sophisticated simulation of power failure fault scenarios. After the power failure fault simulation operation is performed, the system's knowledge and experience module automatically summarizes the loads affected by the power failure in a list according to the processing priority and pushes them to the user. The simulation analysis module automatically provides auxiliary decision-making information such as power failure analysis, intervention measures, and intervention procedures, which truly plays an auxiliary decision-making role in power failure faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A flowchart of querying the electrical nodes downstream of a switch of a lightweight power failure consequence simulation analysis system for a nuclear power unit proposed in an embodiment of the present invention;

[0038] Figure 2 A switch logic judgment flow chart of a lightweight power failure consequence simulation analysis system for a nuclear power unit proposed in an embodiment of the present invention;

[0039] Figure 3 A downstream electrical node logic judgment flow chart of a nuclear power unit lightweight power failure consequence simulation analysis system proposed in an embodiment of the present invention;

[0040] Figure 4 A subsequent flow chart of logic judgment of downstream electrical nodes of a lightweight power failure consequence simulation analysis system for a nuclear power unit proposed in an embodiment of the present invention;

[0041] Figure 5 The present invention provides a flowchart of electrical node definition for a lightweight power failure consequence simulation analysis system for a nuclear power unit proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figures 1 to 5As shown, the present invention proposes a lightweight power failure consequence simulation and analysis system for a nuclear power unit, the system comprising: an electrical node module, a logic judgment module and a simulation analysis module, the electrical node module constructs an electrical node model according to electrical elements and their connection relationships in the electrical primary system, and defines attributes and energized logical relationships for the electrical nodes, and the attribute definitions and energized logical relationship definition data for the electrical nodes are stored in a redis database; the logic judgment module performs logic judgment according to the energized logical relationships of the electrical nodes to judge the state of the electrical nodes (whether the switch is closed or open, and whether the bus and equipment load are de-energized); when the simulation analysis module receives a power failure signal from the electrical node, it queries the downstream electrical node of the power failure electrical node and transmits the power failure signal to the downstream electrical node, performs logic judgment on the power failure electrical node and the downstream electrical node through the logic judgment module, and gives the power failure status of the power failure electrical node and the downstream electrical node according to the judgment result.

[0044] The electrical node module includes electrical nodes and their connection relationships. The electrical nodes include busbars, switches and equipment loads. The electrical node module is a two-dimensional plane diagram constructed based on the distribution of electrical components (including busbars, circuit breakers, contactors, and equipment loads) in the primary electrical system. All electrical components in the primary electrical system are decomposed into independent electrical nodes (circuit breakers and contactors are set as switch electrical nodes), and the electrical node connection relationship is constructed according to the distribution relationship of each electrical component in the primary electrical system to ensure that the electrical node module can truly simulate the electrical components of the primary electrical system and the logical relationship between the electrical components.

[0045] The attribute definition of electrical nodes includes basic information, physical connection relationship, and power failure fault handling decision information, among which the basic information includes node code, node name and node location; the physical connection relationship includes the connection relationship with the power supply, outgoing electrical node and control power supply, and the power failure fault handling decision information includes the power failure accident procedures, power failure experience feedback, drawing information, power failure fault procedures and power failure cause analysis of the electrical node. The energized logic relationship definition of electrical nodes includes instrumentation logic, interlocking logic, manual control and relay protection related content. Specifically, the energized logic relationship definition of the switch includes two logic signals: opening and closing. When the switch receives the defined opening logic signal, the logic judgment module determines that the electrical component of the switch is open; when the switch receives the defined closing logic signal, the logic judgment module determines that the electrical component of the switch is closed. The opening logic signal includes: 1. Manual opening signal or slow-cut device opening signal; 2. Low voltage protection signal (for example, the bus voltage is lower than 70%, and the electrical node of the downstream motor incoming switch is opened); 3. The switch loses its own control power, and whether to define the opening logic signal depends on the switch type (for example, the electrical self-holding contactor automatically trips when the control power is lost, and the mechanical self-holding contactor or circuit breaker remains in place when the control power is lost); 4. Receive automatic switching or tripping protection signals from the electrical node of the equipment load powered by the switch; Closing logic signals include: 1. Manual closing (without locking signals from other control switches) or slow-cut device closing; 2. Automatic switching or other starting signals from the electrical node of the equipment load powered by the switch. As shown in Table 1, it is an example of the definition of the energized logic relationship of the switch, where the number ending with TB is the bus, and the number ending with JA is the switch.

[0046] Table 1 Definition of switch energized logic relationship

[0047]

[0048] The definition of the energized logic relationship of the bus electrical node includes two logic signals: energized and de-energized. The definition of the bus energized logic signal is that if any bus electrical node that supplies power to the bus is energized and the switch on this bus is in the closed state, the bus is energized, otherwise, the bus is de-energized. Take the bus numbered 1LGC001TB as an example. 1LGC001TB has two power supplies. As long as one is available (that is, any one is powered), 1LGC001TB will not lose voltage. The first power supply is available: 1LGD001TB is energized and 1LGC001JA is closed; the second power supply is available: 9LGR002TB is energized and 1LGC102JA is closed. If any power supply is met, the 1LGC001TB bus is energized, otherwise, 1LGC001TB is de-energized. Table 2 lists some examples of energized logic for some buses. If the energized logic is not met, it means that the bus is de-energized.

[0049] Table 2 Definition of busbar live logic relationship

[0050]

[0051] The definition of the energized logic relationship of the electrical node of the equipment load includes two logic signals: energized and de-energized. The definition of the energized logic signal of the equipment load is: if the busbar supplying power to the equipment load is energized and the switch on the busbar is closed, the equipment load is energized, otherwise the equipment load is de-energized.

[0052] After the electrical node receives the power-off signal from the upstream electrical node, the logic judgment module judges the state of the electrical node (whether the switch is open or closed, whether the busbar and equipment load electrical nodes are powered off or powered on) according to the energized logic relationship definition of the electrical node.

[0053] The simulation analysis module performs power failure simulation analysis through the simulation algorithm model. For example, it can simulate the tripping condition of the electrical switch. When the corresponding switch is selected and placed in the open state, the simulation analysis module begins to analyze the consequences of power failure. At the beginning of the simulation, a switch electrical node is opened or closed to make the switch lose power to simulate the power failure of the electrical primary system. The simulation analysis module queries all electrical nodes downstream of the switch electrical node that sends the power failure signal (referred to as the power failure switch). If the power failure switch is a control switch, the downstream node data of each controlled switch electrical node is queried in turn. When querying the electrical nodes downstream of the switch electrical node, the DFS (depth-first search algorithm) is used to traverse the electrical nodes downstream of the switch in turn, and the results of the DFS traversal are preprocessed, and these data are converted into json format and stored in the Redis database; then the corresponding json data is read from the redis database and converted into an electrical node data object, and the switch power failure signal is transmitted to the downstream electrical node.

[0054] At the same time, the simulation analysis module performs logical judgment on the power-off switch and downstream electrical nodes through the logic judgment module, specifically including: reading the energized logical relationship definition of the power-off switch from the redis database, judging whether the power-off switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determining whether the power-off switch should be restored to its original state, and storing the power-off switch state in the redis database; if the power-off switch does not restore to its original state, querying whether the switch has an interlocking switch through the redis database, and judging the state of the interlocking switch of the switch, judging whether the interlocking switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determining the state of the interlocking switch, and storing the state of the interlocking switch in the redis database. The logic judgment module is used to judge the status of the electrical nodes of the downstream switches, busbars and equipment loads. For the downstream switches, the logic judgment module is used to judge whether the downstream switches meet the opening or closing conditions and whether the delay logic is set, determine the status of the downstream switches, and store the status of the downstream switches in the redis database; for the downstream busbars, the upstream incoming line relationship of the downstream busbars is queried through the redis database, and the logic judgment module is used to judge whether the downstream busbars are energized, and the downstream busbar status is stored in the redis database; for the downstream equipment loads, the upstream incoming line relationship of the downstream equipment loads is queried through upward scanning, and the logic judgment module is used to judge whether the downstream equipment loads are energized, and the downstream equipment load status is stored in the redis database.

[0055] Finally, the simulation analysis module and the electrical node module act synchronously. The electrical node module indicates the equipment load affected by the power failure switch in the simulation analysis results through different colors. The simulation analysis module also feeds back to the user the power failure fault processing decision information and basic information defined in the electrical node in the electrical node module of the equipment load affected by the power failure switch. Automatically provide users with auxiliary decision-making information such as power failure analysis, intervention measures, and intervention procedures, which truly plays the role of auxiliary decision-making for power failure. The simulation analysis module also has a knowledge and experience module, which grades the importance of the knowledge and experience modules, and automatically sorts the equipment load affected by the power failure according to the power failure processing priority, and feeds back to the user.

[0056] The present invention proposes a lightweight power failure consequence simulation analysis method for a nuclear power unit, the method comprising:

[0057] Step 1: Build electrical node models of busbars, switches, and equipment loads.

[0058] Step 1.1: The electrical node module builds an electrical node model based on the electrical components and their connection relationships in the electrical primary system.

[0059] Step 1.2: Define the attributes and live logic relationships of electrical nodes. Electrical nodes include busbars, switches, and equipment loads. The attribute definitions of electrical nodes include: basic information, physical connection relationships, and power failure fault handling decision information. The live logic relationship definitions of electrical nodes include: the closing and opening logic signals of switches; the live and power failure logic signals of busbars; the live and power failure logic signals of equipment loads. The attribute definitions and live logic relationship definition data of electrical nodes are stored in the redis database.

[0060] Step 2: Conduct simulation of the consequences of power outage.

[0061] Step 2.1: The simulation analysis module uses the opening or closing of the switch as a power-off signal, queries the data of all electrical nodes downstream of the switch, and transmits the switch power-off signal to all electrical nodes downstream. Specifically, the depth-first search algorithm is used to traverse the electrical nodes downstream of the switch in sequence, and the traversed downstream electrical node data is converted into json format and stored in the redis database; the downstream electrical node json data is read from the redis database and converted into electrical node data, and the switch power-off signal is transmitted to the downstream electrical nodes.

[0062] Step 2.2: The simulation analysis module performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module.

[0063] Step 2.2.1: The simulation analysis module reads the energized logic relationship definition of the switch that sends the power-off signal from the redis database.

[0064] Step 2.2.2: The simulation analysis module uses the logic judgment module to determine whether the switch meets the opening or closing conditions, whether to set the delay logic, determine whether the switch should be restored to its original state, and store the switch status in the redis database.

[0065] Step 2.2.3: If the switch does not return to its original state, the simulation analysis module queries the redis database to see if the switch has an interlock switch and determines the state of the interlock switch; specifically, it includes: determining through the logic judgment module whether the interlock switch meets the opening or closing conditions, whether the delay logic is set, determining the state of the interlock switch, and storing the state of the interlock switch in the redis database.

[0066] Step 2.2.4: The simulation analysis module determines the status of the electrical nodes of the downstream switch, busbar and equipment load through the logic judgment module, specifically including: for the downstream switch, the logic judgment module is used to determine whether the downstream switch meets the opening or closing conditions and whether the delay logic is set, determine the status of the downstream switch, and store the status of the downstream switch in the redis database; for the downstream busbar, the upstream incoming line relationship of the downstream busbar is queried through the redis database, and the logic judgment module is used to determine whether the downstream busbar is energized, and the downstream busbar status is stored in the redis database; for the downstream equipment load, the upstream incoming line relationship of the downstream equipment load is queried through an upward scan, and the logic judgment module is used to determine whether the downstream equipment load is energized, and the downstream equipment load status is stored in the redis database.

[0067] Step 3: Conduct power outage consequence analysis.

[0068] Step 3.1: The electrical node module uses different colors to indicate the equipment load affected by the power failure signal according to the logical judgment result of the simulation analysis module;

[0069] Step 3.2: The simulation analysis module feeds back to the user the power failure fault processing decision information and basic information of the equipment load affected by the switch power failure signal.

[0070] Step 3.3: The knowledge and experience module of the simulation analysis module automatically sorts the equipment loads affected by the power failure signal according to the importance level and provides feedback to the user.

[0071] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A lightweight power failure consequence simulation analysis system for nuclear power units, characterized in that: The system includes an electrical node module, a logic judgment module and a simulation analysis module. The electrical node module constructs an electrical node model according to the electrical elements and their connection relationships in the electrical primary system, and defines the attributes and energized logical relationships of the electrical nodes; the logic judgment module performs logic judgment according to the energized logical relationships of the electrical nodes to determine the state of the electrical nodes; when receiving a power-off signal of the electrical node, the simulation analysis module queries the downstream electrical nodes of the power-off electrical node and transmits the power-off signal to the downstream electrical node, performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module, and gives the power-off status of the downstream electrical node according to the judgment result.

2. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 1, characterized in that: The electrical node includes a bus, a switch and an equipment load, and the attribute definition of the electrical node includes: basic information, physical connection relationship and power failure fault processing decision information.

3. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 2, characterized in that: The definition of the energized logic relationship of the switch includes two logic signals, opening and closing. The opening logic signal includes: manual opening signal or slow-cutting device opening signal; low voltage protection signal; the switch loses its own control power, and whether to define the opening logic signal is determined according to the switch type; receiving an automatic switching or tripping protection signal from the equipment load powered by the switch; the closing logic signal of the switch includes: manual closing or slow-cutting device closing; automatic switching or other start-up signals from the equipment load powered by the switch.

4. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 3, characterized in that: The energized logical relationship definition of the bus includes two logical signals: energized and de-energized. The bus energized logical signal is defined as follows: if any bus supplying power to the bus is energized and the switch on the energized bus is in the closed state, the bus is energized; otherwise, the bus is defined as a de-energized logical signal; the energized logical relationship definition of the equipment load includes two logical signals: energized and de-energized. The equipment load energized logical signal is defined as follows: if the bus supplying power to the equipment load is energized and the switch on the energized bus is closed, the equipment load is energized; otherwise, the equipment load is defined as a de-energized logical signal.

5. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 4, characterized in that: The electrical node module stores the attribute definition and energized logical relationship definition data of the electrical node in the redis database.

6. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 5, characterized in that: The electrical node power failure signal received by the simulation analysis module is specifically to open or close the switch; after receiving the electrical node power failure signal, the simulation analysis module queries the data of all electrical nodes downstream of the switch, and transmits the switch power failure signal to all electrical nodes downstream; The simulation analysis module performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module, specifically including: the simulation analysis module judges whether the switch that sends the power-off signal is set with delay logic, judges the state of the interlocking switch of the switch, and judges the state of the electrical nodes of the downstream switch, busbar and equipment load through the logic judgment module.

7. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 6, characterized in that: The electrical node module receives the logical judgment results of the simulation analysis module on the power-off electrical node and the downstream electrical node, and indicates the equipment load affected by the power-off signal using different colors; the simulation analysis module feeds back the power-off fault processing decision information and the basic information of the equipment load affected by the power-off signal to the user.

8. A lightweight power failure consequence simulation analysis system for nuclear power units according to claim 7, characterized in that: The simulation analysis module is also provided with a knowledge and experience module, which grades the importance of equipment loads, automatically sorts the equipment loads affected by the power failure signal according to the importance grades, and provides feedback to the user.

9. A method for simulating and analyzing lightweight power failure consequences of a nuclear power unit according to any one of claims 1 to 8, characterized in that: The method comprises: Step 1: Build electrical node models of busbars, switches, and equipment loads; Step 1.1: The electrical node module constructs an electrical node model based on the electrical components and their connection relationships in the electrical primary system; Step 1.2: Define the attributes and energized logical relationships of electrical nodes; Step 2: Conduct simulation of the consequences of power outage. Step 2.1: The simulation analysis module uses the opening or closing of the switch as a power-off signal, queries the data of all electrical nodes downstream of the switch, and transmits the power-off signal to all electrical nodes downstream; Step 2.2: The simulation analysis module performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module; Step 3: Conduct power outage consequence analysis; Step 3.1: The electrical node module uses different colors to indicate the equipment load affected by the power failure signal according to the logical judgment result of the simulation analysis module; Step 3.2: the simulation analysis module feeds back the attribute definition information of the equipment load affected by the switch power failure signal to the user; Step 3.3: The knowledge and experience module of the simulation analysis module ranks the equipment loads affected by the power failure signal according to importance levels and provides feedback to the user.

10. A method for simulating and analyzing lightweight power failure consequences of a nuclear power unit according to claim 9, characterized in that: The attribute definition of the electrical node in step 1.2 includes: basic information, physical connection relationship, and power failure fault handling decision information; the energized logical relationship definition of the electrical node includes: the closing and opening logic signals of the switch; the energized and de-energized logic signals of the bus; the energized and de-energized logic signals of the equipment load; the attribute definition of the electrical node and the energized logical relationship definition data are stored in the redis database.

11. A lightweight power failure consequence simulation analysis method for a nuclear power unit according to claim 10, characterized in that: The step 2.1 queries the data of all electrical nodes downstream of the switch, specifically: using a depth-first search algorithm to traverse the electrical nodes downstream of the switch in sequence, and converting the traversed downstream electrical node data into json format, and storing it in the redis database; then reading the downstream electrical node json data from the redis database and converting it into electrical node data.

12. A method for simulating and analyzing lightweight power failure consequences of a nuclear power unit according to claim 11, characterized in that: The simulation analysis module in step 2.2 performs logic judgment on the power-off electrical node and the downstream electrical node through the logic judgment module, specifically including: Step 2.2.1: the simulation analysis module reads the energized logic relationship definition of the switch that sends the power-off signal from the redis database; Step 2.2.2: The simulation analysis module determines whether the switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determines whether the switch is restored to the original state, and stores the switch state in the redis database; Step 2.2.3: If the switch does not return to its original state, the simulation analysis module queries the redis database to determine whether the switch has an interlocking switch, and determines the state of the interlocking switch of the switch; Step 2.2.4: The simulation analysis module determines the status of the electrical nodes of the downstream switches, busbars and equipment loads through the logic judgment module.

13. A method for simulating and analyzing lightweight power failure consequences of a nuclear power unit according to claim 12, characterized in that: In step 2.2.3, the state of the interlock switch of the switch is determined, specifically including: determining whether the interlock switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determining the state of the interlock switch, and storing the state of the interlock switch in the redis database.

14. A method for simulating and analyzing lightweight power failure consequences of a nuclear power unit according to claim 13, characterized in that: The simulation analysis module in step 2.2.4 determines the status of the electrical nodes of the downstream switch, bus and equipment load through the logic judgment module, specifically including: for the downstream switch, determine whether the downstream switch meets the opening or closing conditions and whether the delay logic is set through the logic judgment module, determine the status of the downstream switch, and store the status of the downstream switch in the redis database; for the downstream bus, query the upstream incoming line relationship of the downstream bus through the redis database, determine whether the downstream bus is energized through the logic judgment module, and store the status of the downstream bus in the redis database; for the downstream equipment load, query the upstream incoming line relationship of the downstream equipment load through upward scanning, determine whether the downstream equipment load is energized through the logic judgment module, and store the status of the downstream equipment load in the redis database.

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