Electric power system of nuclear power ship

Abstract

The invention discloses a power system of a nuclear power ship. The power system comprises a medium-voltage power distribution system, a low-voltage power distribution system, an emergency power distribution system, a transformer system and a central control system, the medium-voltage power distribution system provides main power and an ashore power supply system for the whole ship under a conventional working condition; the low-voltage power distribution system provides main power for the whole ship under a conventional working condition; the emergency power distribution system comprises a nuclear-related power distribution system, an emergency power distribution system and an uninterruptible power supply system, and provides emergency power for the working conditions of power loss and ship paralysis; the transformer system realizes middle and low voltage bidirectional power supply conversion; the power distribution system realizes electric power grading distribution; the central control system comprises a power station management system, and signal acquisition, transmission, detection and control of power distribution equipment are realized through the central control system. The high-reliability power system of the nuclear power ship, which can realize multi-subsystem coordination, full-link redundancy, strict standard isolation and full-working-condition coverage, becomes a key to break through the industry bottleneck and guarantee the safe operation of the nuclear power ship.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power ship technology, and specifically relates to a nuclear power ship power system. Background Technology

[0002] With the global energy structure transformation and the upgrading of marine engineering equipment, nuclear power ships, with their advantages of "zero carbon emissions, long endurance, and high power supply," have become core equipment in fields such as deep-sea resource development, polar scientific research, and strategic support in the open sea. Compared with conventional ships (such as bulk carriers and container ships) or ordinary offshore engineering vessels (such as drilling rigs), nuclear power ships, due to carrying the special core equipment of nuclear reactors, place far more stringent requirements on the "reliability, safety, and redundancy" of the ship's power system than the industry norm. They must not only ensure continuous power supply to all conventional equipment (propulsion, lighting, and auxiliary systems), but also guarantee "zero-interruption" power supply to nuclear-related systems such as reactor control, core cooling, and containment protection. Any power failure could trigger nuclear safety risks or even cause catastrophic consequences. However, the current design of nuclear power ship power systems still faces multiple technical bottlenecks and industry challenges, as follows:

[0003] The electrical system design of conventional ships (including ordinary offshore vessels) focuses on "economy and stability under normal operating conditions." However, their redundancy levels, isolation standards, and emergency response capabilities cannot meet the special requirements of nuclear power ships. Problems include insufficient power redundancy, weak fault tolerance, lack of physical isolation, high risk of fault propagation, delayed emergency response, and insufficient coverage of extreme operating conditions.

[0004] As the core of nuclear-powered ships, nuclear reactors and their related nuclear-related systems (such as control rod drive mechanisms, core cooling pumps, and containment spray systems) require "continuity, stability, and independence" of power supply to meet the "millisecond-level fault tolerance" standard. This poses many core challenges to power system design: the "uninterruptibility" requirement of nuclear loads; the "physical isolation" requirement between nuclear systems and conventional systems; and the "power adaptation" requirement under multiple operating conditions.

[0005] In summary, the design concepts, technical solutions, and redundancy levels of existing conventional ship power systems cannot meet the core requirements of nuclear power ships for "high reliability, high safety, and adaptability to all operating conditions"; the special power requirements of nuclear-related systems and the continuous upgrading of industry standards. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a nuclear power ship power system that solves the above-mentioned technical problems existing in the prior art.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A nuclear power ship power system includes a medium-voltage power distribution system, a low-voltage power distribution system, an emergency power distribution system, a transformer system, and a central control system;

[0009] The medium-voltage power distribution system provides the main power for the entire ship under normal operating conditions and the power supply system to shore.

[0010] The low-voltage power distribution system provides the main power for the entire ship under normal operating conditions.

[0011] The emergency power distribution system is a nuclear-related power distribution system, an emergency power distribution system and an uninterruptible power supply system, which provides emergency power for power outages and ship malfunctions.

[0012] The transformer system enables bidirectional power supply conversion between medium and low voltage;

[0013] The power distribution system enables hierarchical power allocation.

[0014] The central control system includes a power plant management system, which realizes the acquisition, transmission, detection, and control of power distribution equipment signals.

[0015] Furthermore, the medium-voltage power distribution system includes two main turbine generators (MTG), two medium-voltage switchboards, two dry-type reactors (DCLR), two external power transmission shore power boards (POB), and one internal power transmission shore power board (PIB2); the low-voltage power distribution system includes two auxiliary generators (RDG), two main switchboards (MSB), and one internal power transmission shore power board (PIB1); the two main turbine generators are respectively located in the stern engine room and the bow engine room, and supply power to the No. 1 medium-voltage switchboard located in MSG Room No. 1 on the port side of the bow main deck and the No. 2 medium-voltage switchboard located in MSG Room No. 2 on the starboard side of the bow main deck via independent trunk cable paths. The No. 1 and No. 2 medium-voltage switchboards are completely physically isolated by steel structure walls;

[0016] The two auxiliary generators are respectively located in APS Room No.1 and APS Room No.2, and supply power to the 400V main switchboard MSB1 located in MSB Room No.1 on the bow three-deck and the 400V main switchboard MSB2 located in MSB Room No.2 on the stern three-deck via independent trunk cable paths. MSB1 and MSB2 are located in different areas and are completely physically isolated. The inner power transmission shore power board PIB2 can supply power to any medium-voltage switchboard. The inner power transmission shore power board PIB1 supplies power to any main switchboard.

[0017] Furthermore, the low-voltage power distribution system includes three emergency generators, namely EDG1, EDG2, and EDG3, and three emergency power distribution boards, namely EGB1, EGB2, and EGB3; EDG1 is located in EDG Room No.1 on the fourth floor at the rear of the nuclear area, and its output terminal is electrically connected to the input terminal of EGB1. The output terminal of EGB1 is electrically connected to the input terminal of the nuclear power distribution board RPB1.

[0018] The EDG2 is located in EDG Room No.2 on the port side of the fifth floor of the nuclear area. Its output terminal is electrically connected to the input terminal of EGB2, and the output terminal of EGB2 is electrically connected to the input terminal of the nuclear power distribution board RPB2.

[0019] The EDG3 is located in EDG Room No. 3 on the starboard side of the fifth deck at the bow of the core area. Its output terminal is electrically connected to the input terminal of EGB3. The EGB3 is used to supply power to the emergency equipment of the entire ship in the event of a ship-wide shutdown. The EGB1, EGB2, and EGB3 are all completely physically isolated from MSB1, MSB2, RPB1, and RPB2.

[0020] Furthermore, the transformer system also includes two nuclear-related power distribution boards, RPB1 and RPB2. The first power input terminal of RPB1 is electrically connected to the output terminal of MSB1, the second power input terminal is electrically connected to the output terminal of MSB2, and the third power input terminal is electrically connected to the output terminal of EGB1. The first power input terminal of RPB2 is electrically connected to the output terminal of MSB2, the second power input terminal is electrically connected to the output terminal of MSB1, and the third power input terminal is electrically connected to the output terminal of EGB2. The power supply equipment of RPB1 and RPB2 is related to nuclear power, and all equipment is powered by RPB1 and RPB2. RPB1 and RPB2 have redundant power distribution, and the three power supply guarantees ensure uninterrupted power supply to the equipment supplied by RPB1 and RPB2.

[0021] Furthermore, the emergency power distribution system includes four 10.5KV / 400V transformers. The high-voltage side of the transformers is electrically connected to the medium-voltage distribution board (MSG1 and MSG2) respectively, and the low-voltage side is electrically connected to the 400V main distribution board (MSB1 and MSB2) respectively.

[0022] The transformer supports a conventional power supply mode of "medium voltage → low voltage" and a reverse power supply mode of "low voltage → medium voltage" to supplement power to the medium voltage distribution board when the main power supply fails.

[0023] Furthermore, the cable path is divided into at least five independent groups, a number higher than the standard three groups for power, control, and signal systems on conventional offshore vessels.

[0024] Furthermore, the central control system includes a hard signal transmission link and a communication signal transmission link, and the hard signal and the communication signal form a redundant backup; the hard signal transmission link outputs multiple sets of hard signals from the distribution boards MSG1, MSG2, MSB1, MSB2, EGB1~EGB3, RPB1~RPB2, the hard signals include 5 sets of switch control signals, 7 sets of emergency stop signals and 2~4 sets of other functional signals, and each set of hard signals is transmitted to the I / O signal acquisition box of different zones.

[0025] Furthermore, in the communication signal transmission link, each of the other distribution boards besides MSG1 and MSG2 outputs two sets of RS485 communication signals; each of the MSG1 and MSG2 outputs four sets of RS485 communication signals, of which two sets of RS485 communication signals are transmitted to the central monitoring system, and the other two sets of RS485 communication signals are transmitted to the local control panel, and the local control panel also transmits two additional sets of communication signals to the central monitoring system.

[0026] Furthermore, it also includes two physically isolated control stations: a central control room located at the bow and a cargo control room located at the stern. Each control station is electrically connected to the transformer system and the central control system, and each control station can monitor and control the operating status of all equipment on the ship.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention constructs a three-level power distribution system of medium voltage, low voltage, and emergency. Each level of the system is independently configured with power generation equipment and switchboards (e.g., 2 sets of main steam turbine generators for the medium voltage system, 2 sets of auxiliary generators for the low voltage system, and 3 sets of emergency generators for the emergency system). Through physical isolation (e.g., medium voltage switchboards MSG1 and MSG2 are isolated by a steel structure wall) and independent cable paths, fault isolation and redundancy protection are achieved to meet the power demand under different operating conditions.

[0029] 2. This invention employs three redundant power inputs (from the low-voltage main distribution boards MSB1 / MSB2 and the emergency distribution boards EGB1 / EGB2, respectively) for nuclear-related power distribution boards RPB1 and RPB2, combined with the independent arrangement of emergency generators (located in different areas of the nuclear area), to ensure uninterrupted power supply to nuclear-related equipment in the event of main power or auxiliary power failure, thus complying with nuclear power safety standards.

[0030] 3. The transformer system used in this invention supports conventional power supply from medium voltage to low voltage and reverse power supply from low voltage to medium voltage. In the event of a main power failure, power can be supplied from the low voltage system to the medium voltage system, thereby improving the system's emergency response flexibility and avoiding power outages caused by the failure of a single power source.

[0031] 4. The cable path used in this invention is divided into at least 5 independent groups, which exceeds the standard of three groups in conventional offshore vessels. By isolating the cables according to signal type, voltage level and functional area, the risk of signal interference and fault propagation is reduced, especially ensuring the stability of cables for nuclear equipment.

[0032] 5. The central control system adopted in this invention employs dual-link backup of hard signals and communication signals: the hard signals cover key commands such as switch control and emergency stop, and are transmitted to I / O acquisition boxes in different zones; the communication signals achieve redundant transmission through multiple sets of RS485 (e.g., the medium-voltage distribution board outputs 4 sets of RS485 signals, taking into account both central monitoring and local control), ensuring the reliability of control commands and status feedback. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0034] Figure 1 This is a schematic diagram of the control flow of the cable laying method according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the overall circuit of an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the local short-circuit control of EDG3 according to an embodiment of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 , Figure 2 As shown, this invention discloses a nuclear power ship power system, which aims to meet the power supply needs of nuclear power ships under normal operating conditions, power outage conditions, and ship malfunction conditions through hierarchical power distribution, redundant design, and isolation measures, especially to ensure uninterrupted power supply to nuclear-related equipment and improve system safety and reliability.

[0039] System Overall Architecture

[0040] The power system of this nuclear power ship consists of five core components: medium-voltage power distribution system, low-voltage power distribution system, emergency power distribution system, transformer system, and central control system. These systems work together to generate, convert, distribute, monitor, and provide emergency power for the entire ship.

[0041] Medium-voltage power distribution system: As the main power source under normal operating conditions, it undertakes the main power supply for the entire ship and the function of supplying power to shore;

[0042] Low-voltage power distribution system: assists the main power supply under normal operating conditions, and covers low-voltage electrical equipment not covered by the medium-voltage system;

[0043] Emergency power distribution system: Focusing on nuclear-related equipment and emergency scenarios, providing emergency power for special conditions such as power outages and ship malfunctions;

[0044] Transformer system: Enables bidirectional conversion between medium-voltage and low-voltage power, ensuring the coordinated operation of systems with different voltage levels;

[0045] Central control system: Through signal acquisition, detection and control, it realizes intelligent management of the entire ship's power system.

[0046] medium voltage power distribution system

[0047] The medium-voltage power distribution system is the core power supply unit under normal operating conditions of the entire ship. Its specific configuration and connection relationships are as follows:

[0048] The core equipment consists of two main steam turbine generators (MTG), two medium-voltage switchboards (MSG1 and MSG2), two dry-type reactors (DCLR), two external power transmission shore power boards (POB), and one internal power transmission shore power board (PIB2).

[0049] Layout and power supply path:

[0050] The two main steam turbine generators (MTGs) are located in the stern and bow engine rooms respectively, and are powered by independent main cable paths to avoid a single point of failure affecting the overall power supply.

[0051] The MTG in the bow engine room supplies power to the No. 1 medium voltage switchboard (MSG1) located in MSG Room No. 1 on the port side of the bow main deck;

[0052] The MTG in the aft engine room supplies power to the No. 2 medium voltage switchboard (MSG2) located in MSG Room No. 2 on the starboard side of the forward main deck;

[0053] MSG1 and MSG2 are completely physically isolated by a steel structure wall to prevent the spread of faults and improve system safety.

[0054] Low-voltage power distribution system

[0055] The low-voltage power distribution system, serving as an auxiliary power supply unit under normal operating conditions, works in conjunction with the medium-voltage system to cover the ship's low-voltage power needs. Its specific configuration is as follows:

[0056] Core equipment consists of 2 auxiliary generators (RDG), 2 main switchboards (MSB1, MSB2) and 1 internal power transmission shore power board (PIB1).

[0057] Layout and power supply path:

[0058] Two auxiliary generators (RDGs) are located in APS Room No.1 and APS Room No.2 respectively, and are powered by independent trunk cable paths;

[0059] The RDG of APS Room No.1 supplies power to the 400V main distribution board (MSB1) located in MSB Room No.1 on the forward third deck;

[0060] The RDG of APS Room No.2 supplies power to the 400V main switchboard (MSB2) located in MSB Room No.2 on the aft third deck;

[0061] MSB1 and MSB2 are located in different areas and are completely physically isolated to avoid mutual interference and fault propagation.

[0062] Shore power interaction function: The internal power transmission shore power board (PIB1) can supply power to MSB1 or MSB2 respectively, realizing flexible connection between shore power and low voltage system.

[0063] Emergency power distribution system

[0064] The emergency power distribution system is specifically designed for special operating conditions, with a focus on ensuring the power supply to nuclear-related equipment and all emergency equipment on board the ship. Its specific configuration is as follows:

[0065] Emergency power generation and distribution equipment: including 3 emergency generators (EDG1, EDG2, EDG3) and 3 emergency distribution boards (EGB1, EGB2, EGB3).

[0066] Equipment layout and connection relationships:

[0067] EDG1 is located in EDG Room No.1 on the 4th floor at the rear of the nuclear area. Its output is electrically connected to the input of EGB1. The output of EGB1 is connected to the nuclear power distribution board (RPB1) to provide emergency power for the first set of nuclear equipment.

[0068] EDG2 is located in EDG Room No.2 on the port side of the fifth deck at the bow of the nuclear area. Its output is electrically connected to the input of EGB2. The output of EGB2 is connected to the nuclear power distribution board (RPB2) to provide emergency power for the second set of nuclear equipment.

[0069] The EDG3 is located in EDG Room No. 3 on the starboard side of the fifth deck at the bow of the core area. Its output is electrically connected to the input of the EGB3. The EGB3 is designed specifically for the ship to be in a state of total ship paralysis and can supply power to the ship's emergency equipment (such as navigation, communication, fire-fighting equipment, etc.) to ensure basic operational capabilities in extreme situations.

[0070] Isolation design: EGB1, EGB2, and EGB3 are all completely physically isolated from MSB1, MSB2, RPB1, and RPB2 to prevent the emergency system from being affected by failures in other systems.

[0071] Transformer system

[0072] The transformer system is a key unit connecting the medium-voltage and low-voltage systems, enabling bidirectional power conversion and redundant power supply for nuclear-related equipment. Its specific configuration is as follows:

[0073] Bidirectional conversion transformer: It includes 4 sets of 10.5KV / 400V transformers, whose high-voltage side is electrically connected to the medium-voltage switchboard (MSG1, MSG2) respectively, and whose low-voltage side is electrically connected to the 400V main switchboard (MSB1, MSB2) respectively.

[0074] Standard mode: Supports "medium voltage → low voltage" power supply, that is, the medium voltage system transmits power to the low voltage system through a transformer to meet the low voltage power demand under normal working conditions;

[0075] Reverse mode: Supports "low voltage → medium voltage" power supply. When the main power supply (such as MTG) fails, the low voltage system can supplement power to the medium voltage system through the transformer to maintain the operation of critical medium voltage equipment.

[0076] Redundant design of nuclear power distribution boards (RPB): Includes two sets of nuclear power distribution boards (RPB1, RPB2), dedicated to powering nuclear power-related equipment, with a three-way redundant power input design.

[0077] The first power input terminal of RPB1 is connected to the output terminal of MSB1, the second power input terminal is connected to the output terminal of MSB2, and the third power input terminal is connected to the output terminal of EGB1.

[0078] The first power input terminal of RPB2 is connected to the output terminal of MSB2, the second power input terminal is connected to the output terminal of MSB1, and the third power input terminal is connected to the output terminal of EGB2.

[0079] The three-way power supply guarantee mechanism ensures uninterrupted power supply to RPB1 and RPB2. Even if one or two of the power supplies fail, the remaining power supply can still maintain the operation of nuclear-related equipment.

[0080] Cable route design

[0081] To enhance the system's anti-interference capability and safety, the cable routing of this system adopts a higher grouping standard than that of conventional offshore vessels, as detailed below:

[0082] The cable route is divided into at least 5 independent groups (typically three groups for power, control, and signal on offshore vessels). The grouping is based on factors such as signal type, voltage level, functional area, and safety requirements.

[0083] Independent grouping can avoid mutual interference between different types of signals (such as interference between strong and weak signals), and at the same time reduce the risk of multiple systems being paralyzed due to a single path failure.

[0084] The cable paths of nuclear-related equipment are grouped separately and shielded and isolated to further ensure signal stability and security.

[0085] Central control system

[0086] The central control system monitors and controls all shipboard electrical equipment through signal acquisition, transmission, and analysis. Redundancy is employed to ensure reliability, specifically including:

[0087] Hard point signal transmission link:

[0088] Multiple sets of hard-point signals are output from each distribution board (MSG1, MSG2, MSB1, MSB2, EGB1~EGB3, RPB1~RPB2), including 5 sets of switch control signals (for equipment start-up and shutdown control), 7 sets of emergency stop signals (for equipment shutdown in emergency conditions), and 2 to 4 sets of other functional signals (such as alarms, status feedback, etc.).

[0089] Each set of hard point signals is transmitted to I / O signal acquisition boxes in different zones to avoid signal loss due to failure of a single acquisition box.

[0090] Communication signal transmission link:

[0091] Other power distribution boards besides MSG1 and MSG2 (such as MSB1, MSB2, EGB1~EGB3, RPB1~RPB2) each output two sets of RS485 communication signals to realize the transmission of equipment status and control commands.

[0092] Each of MSG1 and MSG2 outputs four sets of RS485 communication signals to the local control panel. Two sets are transmitted to the central monitoring system, and the other two sets are transmitted to the local control panel. At the same time, the local control panel transmits two additional sets of communication signals to the central monitoring system, forming multiple redundancies to ensure the reliability of the communication link.

[0093] Control station design:

[0094] Two physically isolated control stations are set up: a central control room located at the front and a cargo control room located at the rear.

[0095] Each control station is electrically connected to the transformer system and the central control system, and can monitor the operating status (such as voltage, current, power, equipment status, etc.) and control the operation (such as start-up, shutdown, switching, parameter adjustment, etc.) of all equipment on the ship.

[0096] The dual control station design ensures that system management can still be achieved through the other control station in the event of a failure of a single control station, thereby improving emergency response capabilities.

[0097] System Workflow

[0098] Standard operating conditions:

[0099] The MTG operation of the medium-voltage power distribution system supplies power to all medium-voltage equipment on the ship through MSG1 and MSG2, and at the same time transmits power to the low-voltage system (MSB1 and MSB2) through transformers.

[0100] The RDG of the low-voltage power distribution system operates as an auxiliary power source, working in conjunction with the medium-voltage to low-voltage power to supply power to low-voltage equipment.

[0101] The central control system monitors the status of each device in real time, and hard signals and communication signals are transmitted in parallel to ensure control reliability.

[0102] Power outage conditions:

[0103] If the main power supply (MTG or RDG) fails, the transformer system automatically switches to a "low voltage → medium voltage" reverse mode, with the low voltage system supplying power to the medium voltage critical equipment; at the same time, the PMS will reasonably handle the opening and closing of the switch to supply the power to the power-loss distribution board according to the current power station situation.

[0104] The emergency power distribution systems EDG1 and EDG2 are activated, supplying power to RPB1 and RPB2 through EGB1 and EGB2 to ensure uninterrupted operation of nuclear-related equipment.

[0105] The central control system issues an alarm signal, and the control station can manually or automatically adjust the power supply strategy.

[0106] The ship is in a state of disarray:

[0107] When both the main power and auxiliary power of the ship fail, EDG3 will automatically start and supply power to the ship's emergency equipment (navigation, communication, fire fighting, etc.) through EGB3;

[0108] Both control stations remain operational, and operators can initiate recovery procedures through the control stations to gradually restore the power system's functions.

[0109] The system can cover normal operating conditions (main and auxiliary power supply working together), power failure conditions (emergency power supply start-up + reverse power supply), and ship paralysis conditions (EDG3 dedicated power supply). It automatically switches the operating mode through preset logic to ensure the power safety of nuclear power ships in various scenarios.

[0110] This invention ensures the safe and reliable power supply of nuclear power ships under various operating conditions through hierarchical power distribution, physical isolation, redundancy design, and bidirectional conversion, especially meeting the high safety requirements of nuclear-related equipment, and is applicable to the power system design of various nuclear-powered ships.

[0111] The above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0112] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A nuclear-powered ship power system, comprising a medium-voltage power distribution system, a low-voltage power distribution system, an emergency power distribution system, a transformer system, and a central control system; characterized in that, The medium-voltage power distribution system provides the main power for the entire ship under normal operating conditions and the power supply system to shore. The low-voltage power distribution system provides the main power for the entire ship under normal operating conditions. The emergency power distribution system is a nuclear-related power distribution system, an emergency power distribution system and an uninterruptible power supply system, which provides emergency power for power outages and ship malfunctions. The transformer system enables bidirectional power supply conversion between medium and low voltage; The power distribution system enables hierarchical power allocation. The central control system includes a power plant management system, which realizes the acquisition, transmission, detection, and control of power distribution equipment signals.

2. The nuclear power ship power system according to claim 1, characterized in that, The medium-voltage power distribution system includes two main turbine generators (MTGs), two medium-voltage switchboards, two dry-type reactors (DCLRs), two external shore power boards (POBs), and one internal shore power board (PIB2). The low-voltage power distribution system includes two auxiliary generators (RDGs), two main switchboards (MSBs), and one internal shore power board (PIB1). The two main turbine generators are respectively located in the stern engine room and the bow engine room, and supply power to the No. 1 medium-voltage switchboard located in MSG Room No. 1 on the port side of the bow main deck and the No. 2 medium-voltage switchboard located in MSG Room No. 2 on the starboard side of the bow main deck via independent trunk cable paths. The No. 1 and No. 2 medium-voltage switchboards are completely physically isolated by steel structure walls. The two auxiliary generators are respectively located in APS Room No.1 and APS Room No.2, and supply power to the 400V main switchboard MSB1 located in MSB Room No.1 on the bow three-deck and the 400V main switchboard MSB2 located in MSBRoom No.2 on the stern three-deck via independent trunk cable paths. MSB1 and MSB2 are located in different areas and are completely physically isolated. The internal power transmission shore power board PIB2 can supply power to any medium-voltage switchboard. The internal power transmission shore power board PIB1 supplies power to any main switchboard.

3. The nuclear power ship power system according to claim 1, characterized in that, The low-voltage power distribution system includes three emergency generators, namely EDG1, EDG2, and EDG3, and three emergency power distribution boards, namely EGB1, EGB2, and EGB3. EDG1 is located in EDG Room No.1 on the fourth floor at the rear of the nuclear area, and its output is electrically connected to the input of EGB1. The output of EGB1 is electrically connected to the input of the nuclear power distribution board RPB1. The EDG2 is located in EDG Room No.2 on the port side of the fifth floor of the nuclear area. Its output terminal is electrically connected to the input terminal of EGB2, and the output terminal of EGB2 is electrically connected to the input terminal of the nuclear power distribution board RPB2. The EDG3 is located in EDG Room No. 3 on the starboard side of the fifth deck at the bow of the core area. Its output terminal is electrically connected to the input terminal of EGB3. The EGB3 is used to supply power to the emergency equipment of the entire ship in the event of a ship-wide shutdown. The EGB1, EGB2, and EGB3 are all completely physically isolated from MSB1, MSB2, RPB1, and RPB2.

4. The nuclear power ship power system according to claim 2, characterized in that, The transformer system also includes two nuclear-related power distribution boards, RPB1 and RPB2. RPB1's first power input terminal is electrically connected to the MSB1 output terminal, its second power input terminal is electrically connected to the MSB2 output terminal, and its third power input terminal is electrically connected to the EGB1 output terminal. RPB2's first power input terminal is electrically connected to the MSB2 output terminal, its second power input terminal is electrically connected to the MSB1 output terminal, and its third power input terminal is electrically connected to the EGB2 output terminal. The power supply equipment for RPB1 and RPB2 is related to nuclear power, and all equipment is powered by RPB1 and RPB2. RPB1 and RPB2 have redundant power distribution, and the three power supplies ensure uninterrupted power supply to the equipment supplied by RPB1 and RPB2.

5. The nuclear power ship power system according to claim 4, characterized in that, The emergency power distribution system includes four 10.5KV / 400V transformers. The high-voltage side of the transformer is electrically connected to the medium-voltage distribution board (MSG1 and MSG2) respectively, and the low-voltage side is electrically connected to the 400V main distribution board (MSB1 and MSB2) respectively. The transformer supports the conventional power supply mode of "medium voltage → low voltage" and also supports the reverse power supply mode of "low voltage → medium voltage" to supplement power to the medium voltage distribution board when the main power supply fails.

6. The nuclear power ship power system according to claim 1, characterized in that, The cable path is divided into at least 5 independent groups, which is higher than the standard of three groups for power, control and signal on conventional offshore vessels.

7. The nuclear power ship power system according to claim 2, characterized in that, The central control system includes a hard signal transmission link and a communication signal transmission link, and the hard signal and the communication signal form a redundant backup. The hard signal transmission link outputs multiple sets of hard signals from the distribution boards MSG1, MSG2, MSB1, MSB2, EGB1~EGB3, and RPB1~RPB2. The hard signals include 5 sets of switch control signals, 7 sets of emergency stop signals, and 2~4 sets of other functional signals. Each set of hard signals is transmitted to the I / O signal acquisition box of different zones.

8. The nuclear power ship power system according to claim 7, characterized in that, In the communication signal transmission link, each of the other distribution boards, except for MSG1 and MSG2, outputs two sets of RS485 communication signals; each of the MSG1 and MSG2 outputs four sets of RS485 communication signals, of which two sets of RS485 communication signals are transmitted to the central monitoring system, and the other two sets of RS485 communication signals are transmitted to the local control panel. The local control panel also transmits two additional sets of communication signals to the central monitoring system.

9. The nuclear power ship power system according to claim 1, characterized in that, It also includes two physically isolated control stations: a central control room located at the bow and a cargo control room located at the stern. Each control station is electrically connected to the transformer system and the central control system, and each control station can monitor and control the operating status of all equipment on the ship.

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