A simulation system for a power generation system

Abstract

The utility model discloses a ship field relates to a kind of simulation system of power generation system, the utility model discloses, including: prime mover module, with laboratory power grid connection, for the laboratory power grid simulation and output as the mechanical power of ship prime mover;Shaft generator frequency conversion cabinet, with the prime mover module is connected, for The mechanical power of the prime mover module output is converted into stable alternating current;Auxiliary generation module, with the laboratory power grid connection, for The laboratory power grid is converted into stable alternating current;Load module, for simulating the load when ship motor starts and stably operates;Power distribution module, for based on test instruction, the shaft generator frequency conversion cabinet, the auxiliary generation module and the load module are accessed or leave ship simulation power grid.The entire platform can reproduce ship power station environment, provide complete experimental basis for testing the stability of ship power equipment under parallel, decoupling and other working conditions.

Description

Technical Field

[0001] This utility model relates to the field of shipbuilding, and in particular to a simulation system for a power generation system. Background Technology

[0002] The ship's electrical system mainly consists of shaft-driven generators and auxiliary generators. The main engine shaft-driven generators use the mechanical power of the ship's prime mover (i.e., the ship's main engine) to output electrical energy, while the auxiliary generators provide power independently when the main engine is stopped or operating at low speed.

[0003] Because the prime mover speed of a ship's shaft-driven generator fluctuates with changes in speed and operating conditions, the output voltage and frequency of the generator are inherently dynamic and unstable. Furthermore, during actual navigation, the shaft-driven generator and auxiliary generator frequently need to be switched between parallel and decoupled, a process that can impact the stability of the power grid. Therefore, a simulation system is needed that can simulate the dynamic mechanical energy output by the ship's prime mover and convert it into dynamic electrical energy in a laboratory environment. This allows for further simulation of the parallel / decoupled process of the shaft-driven and auxiliary generators, providing a basis for testing the stability of the ship's power grid. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a simulation system for a power generation system, which can simulate the dynamic mechanical energy output by the ship's prime mover and convert it into dynamic electrical energy, thereby further simulating the parallel / decoupling process of the shaft generator and the auxiliary generator, thus providing a basis for testing the stability of the ship's power grid.

[0005] To address the aforementioned technical problems, embodiments of this utility model provide a simulation system for a power generation system, comprising: a prime mover module connected to a laboratory power grid, used to simulate and output the mechanical power of the ship's prime mover from the laboratory power grid; a shaft generator frequency converter cabinet connected to the prime mover module, used to convert the mechanical power output by the prime mover module into stable alternating current; an auxiliary generator module connected to the laboratory power grid, used to convert the laboratory power grid into stable alternating current; a load module used to simulate the load during the startup and stable operation of the ship's motor; and a power distribution module used to connect or disconnect the shaft generator frequency converter cabinet, the auxiliary generator module, and the load module from the ship's simulated power grid based on test commands.

[0006] Furthermore, the prime mover module includes: a frequency converter simulation cabinet for adjusting the laboratory power grid to a preset voltage and frequency; and a first motor connected to the frequency converter simulation cabinet for simulating and converting the voltage and frequency output by the frequency converter simulation cabinet into the mechanical power of the ship's prime mover. First, the frequency converter simulation cabinet adjusts the laboratory steady-state power supply to a specific voltage and frequency, effectively simulating the power source of the ship's prime mover. Then, the first motor converts the adjusted voltage and frequency into the mechanical power of the ship's prime mover, effectively providing an unsteady power source to the shaft generator frequency converter cabinet.

[0007] Furthermore, the simulation system also includes a second motor, connected to the first motor and the shaft generator frequency converter cabinet, used to output AC power that fluctuates with rotational speed to the shaft generator frequency converter cabinet under the drive of the mechanical power output by the first motor. By simulating the ship's shaft generator with the second motor, and by connecting the second motor to the first motor, the simulation of the ship's prime mover and shaft generator is achieved in a laboratory environment, thereby providing a highly realistic simulated power supply for testing equipment such as the ship's shaft generator frequency converter cabinet.

[0008] In this embodiment of the invention, a prime mover module is designed to regulate and simulate the mechanical power output of a ship's prime mover from a constant voltage and frequency laboratory power grid, thereby realistically reproducing the dynamic characteristics of a ship's prime mover driving a shaft-driven generator. Furthermore, a shaft-generator frequency converter cabinet is used to excite, rectify, and invert the dynamic AC power, outputting stable AC power. This simulates the power generation behavior of a ship's shaft generator under different ship speeds and operating conditions in a laboratory environment and verifies the stability of the shaft-generator frequency converter cabinet. Simultaneously, an auxiliary generator module directly converts the laboratory power grid into constant frequency and constant voltage AC power to simulate the power supply capability of a ship's auxiliary generator. A load module simulates the inrush current impact during motor startup and the inductive load during motor operation, jointly constructing a power environment that closely approximates the actual operating conditions of a ship. Finally, the power distribution module, under test commands, uniformly schedules the synchronous paralleling and separation switching of the shaft generator and auxiliary generator, as well as the dynamic connection of the load. Through the above design, the entire platform can reproduce the marine power station environment, including the dynamic power supply of the prime mover, the constant power supply of the auxiliary generator, and various marine loads, providing a complete experimental basis for testing the stability of the ship's shaft generator frequency converter under parallel, disconnected and off-grid conditions. Attached Figure Description

[0009] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0010] Figure 1 This is a block diagram of a simulation system for a power generation system provided by this utility model; Figure 2 This is a schematic diagram of the structure of a simulation system for a power generation system provided by this utility model.

[0011] The numbers in the diagram are explained as follows: 100, Laboratory power grid; 200, Prime mover module; 210, Variable frequency drive (VFD) simulation cabinet; 220, First motor; 300, Shaft generator module; 310, Second motor; 320, Shaft generator VFD cabinet; 400, First transformer; 500, Auxiliary generator module; 600, Second transformer; 700, Power distribution module; 710, First grid-connected cabinet; 720, Second grid-connected cabinet; 730, Power distribution block; 800, Load module; 810, Water pump load; 820, Inductive load; 830, Resistive load. Detailed Implementation

[0012] In a ship's electrical system, the main engine shaft generator and auxiliary generators constitute the core sources of electrical energy. The main engine shaft generator generates electricity directly from the mechanical power output of the ship's main engine. The mechanical energy output from the main engine shaft drives the rotor of the main engine shaft generator through reduction gears or couplings to generate voltage and frequency electrical energy. The auxiliary generator, on the other hand, is usually driven by a separate small diesel engine or electric motor, used to maintain continuous power supply to the ship's "hotel loads" (lighting, air conditioning, electronic equipment, etc.) when the main engine is shut down, sailing at slow speeds, or in port conditions. Under high load or emergency conditions, the main engine shaft generator and auxiliary generator can operate in parallel, sharing the load through synchronization devices, parallel control cabinets, and the bus system.

[0013] However, the output electrical energy of the generator driven by the ship's main engine shaft has obvious dynamic characteristics: 1. Rotational Speed ​​Fluctuations: During different speeds and zigzag navigation, the output rotational speed of the main engine will change significantly, especially during variable speed navigation, acceleration / deceleration maneuvers, or operation against wind and current. Instantaneous fluctuations in rotational speed will directly affect the output electrical characteristics of the shaft-driven generator.

[0014] 2. Voltage and Frequency Fluctuations: With the dynamic fluctuations in the prime mover's speed, the generator terminal voltage amplitude and the grid frequency will also experience non-ideal deviations. Frequency drift will cause malfunctions or even tripping of the ship's grid synchronization equipment, while voltage fluctuations will lead to performance degradation or failure of the load equipment.

[0015] 3. Large inertia response hysteresis: The system inertia between the ship's main engine and shaft generator is large, and the response to sudden changes (such as large load switching in / out) is relatively slow, and the grid frequency regulation capability is limited.

[0016] In actual navigation and port operations, the ship's main engine shaft generator and auxiliary generator need to be frequently switched between parallel operation and decoupling, which has a certain impact on the stability of the ship's power grid.

[0017] 1. Parallel switching impact: When the shaft-driven generator and the auxiliary generator are running in parallel, if their voltage, frequency or phase is mismatched, an inrush current and transient voltage drop will be generated at the moment of switching, which may cause the circuit breaker to trip or the equipment to be damaged in severe cases.

[0018] 2. Risks during disconnection: If the auxiliary generator or main generator suddenly disconnects from the grid after stopping parallel operation, the grid capacity will decrease sharply, which may cause the voltage to rise or the frequency to jump abruptly, affecting the load distribution and stability control of the remaining power generation units.

[0019] Therefore, the aforementioned paralleling / decoupling operations are often accompanied by inrush currents, over / undervoltage surges, sudden frequency changes, and harmonic distortions, posing serious challenges to the safety of shipboard power distribution networks and the lifespan of electrical equipment. Currently, due to the influence of environmental conditions and external interference during sea trials, it is difficult to systematically evaluate the dynamic characteristics and control strategy effectiveness of shipboard power systems under various extreme conditions in a controllable and repeatable environment. To evaluate the stability of shipboard power systems under actual complex operating conditions, it is necessary to reproduce the aforementioned dynamic characteristics in a laboratory environment. 1. Prime mover speed simulation: Accurately simulate the transient acceleration, deceleration and steady-state operation curves of the ship's main engine under different speed and load conditions to generate frequency and voltage disturbances consistent with the actual situation.

[0020] 2. Reproduction of the parallel / disconnection process of dual generators: Implement bench tests for parallel grid connection and disconnection switching between the generator and the auxiliary generator. By controlling the switching timing and phasor matching, evaluate the impact response of the grid during the parallel entry and exit process.

[0021] In summary, establishing a simulation platform for ship power systems based on hardware-in-the-loop and power electronic interfaces is of great significance for studying millisecond-level dynamic power response, parallel switching transient characteristics, and dynamic power distribution. It can also provide reliable experimental basis for the design optimization, control strategy verification, and fault diagnosis of ship power grids.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this utility model. The various embodiments can be combined with and referenced by each other without contradiction.

[0023] One embodiment of this utility model relates to a simulation system for a power generation system, comprising: a prime mover module connected to a laboratory power grid for simulating and outputting the mechanical power of a ship's prime mover from the laboratory power grid; a shaft generator frequency converter connected to the prime mover module for converting the mechanical power output by the prime mover module into stable alternating current; an auxiliary generator module connected to the laboratory power grid for converting the laboratory power grid into stable alternating current; a load module for simulating the load during the starting and stable operation of the ship's motor; and a power distribution module for connecting or disconnecting the shaft generator frequency converter, the auxiliary generator module, and the load module from the ship's simulated power grid based on test commands.

[0024] In this embodiment of the invention, a prime mover module is designed to regulate and simulate the mechanical power output of a ship's prime mover from a constant voltage and frequency laboratory power grid, thereby realistically reproducing the dynamic characteristics of a ship's prime mover driving a shaft-driven generator. Furthermore, a shaft-generator frequency converter cabinet is used to excite, rectify, and invert the dynamic AC power, outputting stable AC power. This simulates the power generation behavior of a ship's shaft generator under different ship speeds and operating conditions in a laboratory environment and verifies the stability of the shaft-generator frequency converter cabinet. Simultaneously, an auxiliary generator module directly converts the laboratory power grid into constant frequency and constant voltage AC power to simulate the power supply capability of a ship's auxiliary generator. A load module simulates the inrush current impact during motor startup and the inductive load during motor operation, jointly constructing a power environment that closely approximates the actual operating conditions of a ship. Finally, the power distribution module, under test commands, uniformly schedules the synchronous paralleling and separation switching of the shaft generator and auxiliary generator, as well as the dynamic connection of the load. Through the above design, the entire platform can reproduce the marine power station environment, including the dynamic power supply of the prime mover, the constant power supply of the auxiliary generator, and various marine loads, providing a complete experimental basis for testing the stability of the ship's shaft generator frequency converter under parallel, disconnected and off-grid conditions.

[0025] The following is a detailed description of the simulation system of a power generation system according to an embodiment of the present invention. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0026] like Figure 1 The diagram illustrates the structure of a simulation system for a power generation system, including: The prime mover module 200 is connected to the laboratory power grid 100 and is used to simulate and output the mechanical power of the ship's prime mover from the laboratory power grid 100.

[0027] Specifically, the aforementioned prime mover module 200 includes: a frequency converter simulation cabinet 210, used to adjust the laboratory power grid 100 to a preset voltage and frequency; and a first motor 220, connected to the frequency converter simulation cabinet 210 and the shaft generator frequency converter cabinet, used to simulate and output the voltage and frequency output by the frequency converter simulation cabinet 210 as the mechanical power of the ship's prime mover.

[0028] Furthermore, after the prime mover module 200 is connected to the laboratory power grid 100, the steady-state power supply provided by the laboratory is first precisely adjusted through the frequency converter simulation cabinet 210 to ensure that the output voltage and frequency reach the preset target values. In this way, regardless of the fluctuations in the laboratory power grid 100 itself, the frequency converter simulation cabinet 210 can stably provide a reference power supply that matches the ship's prime mover, laying a good foundation for subsequent fluctuation simulation. Based on this, the first motor 210 receives this reference voltage and frequency and, through its internal power electronics and mechanical coupling structure, converts the reference power supply into mechanical power with the characteristics of a ship's prime mover, thereby providing the power for the subsequent shaft generator power generation.

[0029] Furthermore, the first motor 220 is directly coupled to the frequency converter simulation cabinet 210. The electrical energy output by the frequency converter simulation cabinet 210 directly drives the first motor 220 through the power interface. Therefore, the mechanical speed of the first motor 220 can be precisely controlled near the preset value and fluctuate slightly up and down accordingly. This ensures that the speed fluctuation characteristics of the first motor 220 are highly consistent with the dynamic response of the ship's prime mover under load changes or sea state disturbances.

[0030] In addition, the simulation system also includes a shaft generator module 300, which includes a second motor 310 and a shaft generator frequency converter cabinet 320. The shaft generator module 300 is used to convert the unstable mechanical kinetic energy of the prime mover-like output simulated by the prime mover module 200 into steady-state alternating current, thereby simulating the real shaft generator power supply on board.

[0031] The second motor 310 is connected to the first motor 220 and the shaft generator frequency converter cabinet 320, and is used to output the AC power that fluctuates with the rotational speed to the shaft generator frequency converter cabinet 320 under the drive of the mechanical power output by the first motor 220.

[0032] Specifically, the second motor 310, driven by the first motor 220, can synchronously generate electricity from the shaft generator and provide unsteady-state electrical energy to the frequency converter simulation cabinet. Thanks to this, when the shaft generator frequency converter cabinet 320 receives the unsteady-state power output from the second motor 310, it can accurately perceive the power source characteristics such as voltage fluctuations and frequency jitters emitted by the simulated shaft generator, thereby comprehensively verifying and optimizing its control algorithm and protection logic.

[0033] at the same time, Figure 2A structural diagram of the ship simulation system is shown. (For example...) Figure 2 The second motor 310 is directly connected to the shaft end of the first motor 220 via a dedicated universal joint or magnetic coupling shaft, which not only simplifies the mechanical structure but also reduces transmission losses. In normal operating mode, the second motor 310 operates as a synchronous generator. Its excitation system is linked with the closed-loop voltage regulation system, which can adjust the excitation current in real time to respond to the slight speed fluctuations of the first motor 220. This generates voltage, frequency, and phase at the output end that fluctuate synchronously with the speed, thus providing the back-end shaft generator frequency converter cabinet with a power environment that is highly consistent with that of a real ship generator set.

[0034] Optionally, an electromagnetically adjustable damper can be added to the coupling section between the first motor 220 and the second motor 310. This damper allows for dynamic adjustment of the damping strength, simulating the torsional vibration characteristics of different ship shaft sections under wave loads. This design enables the test platform to better reflect actual torsional vibration coupling scenarios when verifying the anti-torsional vibration control and protection logic of the shaft generator frequency converter cabinet, thereby improving the reliability of the equipment under extreme sea conditions.

[0035] The shaft generator frequency converter cabinet is connected to the prime mover module 200 and is used to convert the AC power output by the prime mover module 200 into stable AC power in order to test the voltage regulation capability and device stability of the shaft generator frequency converter cabinet on the ship for unstable AC power.

[0036] Specifically, the aforementioned shaft-driven frequency converter cabinet includes a first rectifier unit and a first inverter unit. The first rectifier unit and the first inverter unit are connected. The first rectifier unit is used to convert the AC power input to the motor simulation cabinet 210 into DC power, and the first inverter unit is used to convert the DC power into stable AC power.

[0037] Furthermore, such as Figure 2 The aforementioned shaft-driven frequency converter cabinet first rectifies the unsteady AC power from the motor simulation cabinet 210 into DC power through the first rectifier unit. The DC bus voltage is then supplied to the first inverter unit after passing through a filter and voltage stabilization device. The first inverter unit uses PWM control to invert the DC power into three-phase AC power with highly stable frequency, phase, and voltage amplitude, thereby effectively suppressing the frequency jitter and voltage fluctuations introduced by the prime mover module 200, and thus providing the subsequent power distribution module 700 with electrical energy that meets the marine power grid quality standards.

[0038] In addition, the above-mentioned simulation system also includes a first transformer 400, which is connected between the shaft generator frequency converter cabinet and the power distribution module 700. The first transformer 400 is used to adjust the voltage of the AC power output by the shaft generator frequency converter cabinet to the preset voltage of the simulated power grid on the ship and output it to the power distribution module 700.

[0039] Furthermore, the aforementioned first transformer 400 performs voltage level matching, using an on-load tap that can be adjusted during operation to boost or reduce the AC voltage output from the inverter cabinet from the medium-voltage level (e.g., 690V) of the inverter unit to the typical distribution voltage (e.g., 3.3kV or 6.6kV) of the simulated power grid on board. The transformer also integrates core excitation bypass protection and partial discharge monitoring, enabling rapid alarm or switching to bypass operation in case of overload or harmonic anomalies, ensuring the continuity and safety of the testing system.

[0040] The auxiliary generator module 500 is connected to the laboratory power grid 100 and is used to convert the laboratory power grid 100 into stable alternating current, thereby simulating the shaft generator power supply on the ship and providing a hardware foundation for grid connection with the shaft generator power supply.

[0041] Specifically, the aforementioned auxiliary frequency converter cabinet includes a second rectifier unit and a second inverter unit. The second rectifier unit and the second inverter unit are connected. The second rectifier unit is used to convert the AC power input from the laboratory power grid 100 into DC power, and the second inverter unit is used to convert the DC power into stable AC power.

[0042] Furthermore, such as Figure 2 The aforementioned auxiliary generator module 500 is connected in parallel with the laboratory's public power grid. Its internal structure is similar to that of the shaft generator frequency converter cabinet: the steady-state AC power from the public power grid is converted into DC power through the second rectifier unit. The DC bus voltage is then supplied to the second inverter unit after passing through a filter and voltage regulator. Subsequently, the second inverter unit inverts the DC power into stable AC power. This stable AC power can provide emergency backup power for the simulation platform, and can also maintain power supply to the distribution module 700 in the event of a power grid failure, ensuring that critical testing procedures are not interrupted.

[0043] In addition, the above simulation system also includes a second transformer 600, which is connected between the auxiliary generator module 500 and the power distribution module 700. The second transformer 600 is used to adjust the voltage of the AC power output by the auxiliary generator module 500 to the preset voltage of the simulated power grid on the ship and output it to the power distribution module 700.

[0044] The load module 800 is used to simulate the load during the startup and stable operation of the ship's motors.

[0045] Specifically, the aforementioned load modules include: a water pump load 810, connected to the power distribution module 700, used to simulate the load during stable startup of the ship's motor; an inductive load 820, connected to the power distribution module 700, used to simulate the load during stable operation of the ship's motor; and a resistive load 830, connected to the power distribution module 700, used to simulate a purely resistive load on the ship.

[0046] Furthermore, the aforementioned load module 800 accurately reproduces the power and reactive power demand characteristics of the ship's motors on the power grid under different operating conditions through various types of controllable load devices, providing a real and reliable testing environment for the performance evaluation of the upper-level power distribution module 700 and frequency converter cabinets.

[0047] First, such as Figure 2 The water pump load 810 uses a variable frequency drive centrifugal water pump, directly connected to the power distribution module 700. When simulating the ship's motor starting from standstill and reaching rated speed, the water pump exhibits typical flow-head and power-speed curves through its pump characteristic curves. It generates an inrush current of up to 2-3 times the rated current at startup, which quickly reaches a steady state as the speed increases. By embedding soft-start and load feedback control algorithms at the driver end, the startup acceleration slope and torque curve can be precisely adjusted to simulate various starting conditions such as full load, water tank no-load, or half-load, verifying the frequency converter cabinet's current limiting, overload protection, and harmonic suppression capabilities under high current impact.

[0048] Secondly, the inductive load 820 consists of a set of switchable inductors and reactors connected to the power distribution module 700. It simulates the reactive power consumption and power factor changes of the ship's motors during stable operation. Each reactor integrates a digital excitation control unit, enabling high-precision adjustment of the inductive reactance value and real-time changes in the power factor range during operation. This allows the system to simultaneously generate capacitive or inductive reactive power, testing the active filtering and reactive power compensation effects of the power distribution module 700 and the frequency converter under different power factor conditions. Furthermore, by connecting multiple inductors in parallel or series and rapidly switching them using switches, a step change in load can be completed in a short time, examining the equipment's response speed and stability to rapid reactive power disturbances.

[0049] Furthermore, the 830 resistive load employs a multi-segment programmable resistor cabinet. The resistive elements are a combination of high-power thin-film and metal alloy structures. Heat dissipation utilizes a combined air-cooling and water-cooling method, ensuring that the temperature rise during prolonged high-power operation does not exceed 60℃. The resistor group can be segmented according to specifications such as 10Ω, 20Ω, and 50Ω per segment, and can be combined and switched via commands issued by a PLC or host computer system, achieving a power regulation accuracy of ±1%. When testing purely resistive equipment such as marine lighting, heating, and steering gear, it can simulate step-by-step or ramp-type power absorption, verifying the current harmonic content, power factor, and efficiency performance of the shaft-driven frequency converter cabinet under different load levels.

[0050] The power distribution module 700 is used to connect or disconnect the shaft generator frequency converter cabinet, the auxiliary generator module 500 and the load module 800 from the ship's simulated power grid based on test commands.

[0051] Specifically, the aforementioned power distribution module 700 includes: a first grid-connected cabinet 710, connected to the first transformer 400, used to connect or disconnect the shaft generator frequency converter cabinet from the ship's simulated power grid based on test commands; a second grid-connected cabinet 720, connected to the second transformer 600, used to connect or disconnect the auxiliary generator frequency converter cabinet from the ship's simulated power grid based on test commands; and a power distribution block 730, used to connect the first grid-connected cabinet 710, the second grid-connected cabinet 720, and the load module 800 in parallel.

[0052] Furthermore, the power distribution module 700, with the first grid-connected cabinet 710 and the second grid-connected cabinet 720 as its core, can flexibly connect or disconnect the shaft-generated frequency converter cabinet and the auxiliary frequency converter cabinet from the ship's simulated power grid according to test commands. Specifically, the first grid-connected cabinet 710 is connected to the first transformer 400 and is equipped with multiple voltage and current transformers and a synchronization detection unit inside. This unit is used to detect the phase, frequency, and amplitude of the inverter cabinet's output voltage in real time and lock the phase angle with the reference signal of the ship's simulated power grid. Based on the above monitoring unit, the controller will only issue a closing command to complete grid connection when the synchronization error is less than a set threshold (e.g., phase difference < 2°, frequency difference < 0.1Hz); otherwise, the system can automatically adjust the inverter output or wait for command intervention to ensure no power grid impact during the switching process. The second grid-connected cabinet 720 is connected to the second transformer 600 and has similar functions to the first grid-connected cabinet 710, but can be independently configured with different synchronization strategies and protection logic to meet the differentiated needs of main and auxiliary grid connection. In addition, the first grid-connected cabinet 710 and the second grid-connected cabinet 720 communicate with the test host computer through a dedicated channel to maintain low latency and high reliability data interaction.

[0053] Furthermore, the first grid-connected cabinet 710, the second grid-connected cabinet 720, and the load module 800 are connected in parallel on the same bus network via the distribution block 730, achieving centralized distribution and control of the entire simulated power grid. Through the distribution block 730, the three units form an equipotential and low-internal-resistance parallel structure, ensuring that when any unit switches, the remaining units can continuously obtain or release electrical energy from the bus, thereby eliminating mutual interference between sub-modules and improving the flexibility and safety of the testing process.

[0054] Optionally, the above simulation system also includes a monitoring module connected to the shaft generator frequency converter cabinet and the power distribution module 700, for collecting, displaying and recording power grid parameters.

[0055] Furthermore, the monitoring module can be equipped with power quality analyzers, phase measurement units, and high-precision temperature / vibration sensors at nodes such as the frequency converter simulation cabinet 210, motor, grid-connected cabinet, shaft generator simulation cabinet, and auxiliary generator simulation cabinet. Data is aggregated to a local or cloud-based test data center via a dedicated communication channel. Through data preprocessing, the monitoring module can output traceable synchronous phasor data, supporting post-test review and comparison of multiple test results, providing high-precision data support for ship power system performance evaluation, protection strategy optimization, and digital twin model calibration.

[0056] Optionally, the simulation system may also include a host computer for centralized control and scheduling of all modules of the simulation system.

[0057] Furthermore, within the entire simulation system, the host computer serves as the core node for centralized monitoring and scheduling. It is responsible for the unified management and test command issuance, data acquisition, process visualization, and report generation of the prime mover module 200, shaft generator frequency converter cabinet, auxiliary generator module 500, load module 800, and power distribution module 700. The host computer communicates with the controllers of each submodule via industrial Ethernet or fiber optic ring network, sending real-time test commands such as start-up, grid connection, switching, and script execution, and receiving status information, measurement data, and alarm events returned by each module. The host computer also provides operators with a graphical interface, including a standalone operation interface, a distributed group control interface, and a dynamic trend display. Views can be switched as needed to quickly locate the operating parameters and performance indicators of each subsystem.

[0058] In this embodiment of the invention, a prime mover module is designed to regulate and simulate the mechanical power output of a ship's prime mover from a constant voltage and frequency laboratory power grid, thereby realistically reproducing the dynamic characteristics of a ship's prime mover driving a shaft-driven generator. Furthermore, a shaft-generator frequency converter cabinet is used to excite, rectify, and invert the dynamic AC power, outputting stable AC power. This simulates the power generation behavior of a ship's shaft generator under different ship speeds and operating conditions in a laboratory environment and verifies the stability of the shaft-generator frequency converter cabinet. Simultaneously, an auxiliary generator module directly converts the laboratory power grid into constant frequency and constant voltage AC power to simulate the power supply capability of a ship's auxiliary generator. A load module simulates the inrush current impact during motor startup and the inductive load during motor operation, jointly constructing a power environment that closely approximates the actual operating conditions of a ship. Finally, the power distribution module, under test commands, uniformly schedules the synchronous paralleling and separation switching of the shaft generator and auxiliary generator, as well as the dynamic connection of the load. Through the above design, the entire platform can reproduce the marine power station environment, including the dynamic power supply of the prime mover, the constant power supply of the auxiliary generator, and various marine loads, providing a complete experimental basis for testing the stability of the ship's shaft generator frequency converter under parallel, disconnected and off-grid conditions.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0061] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances. It is worth mentioning that all modules involved in this embodiment are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by this invention; however, this does not mean that other units are absent in this embodiment.

[0064] Furthermore, the examples mentioned in the above embodiments can be freely combined, and any combination can be understood as an embodiment. The terms "embodiment" or "example" appearing in various locations in the specification do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments.

[0065] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A simulation system for a power generation system, characterized in that, include: The prime mover module is connected to the laboratory power grid and is used to simulate and output the mechanical power of the ship's prime mover. A shaft-driven frequency converter cabinet is connected to the prime mover module and is used to convert the mechanical power output by the prime mover module into stable alternating current. An auxiliary power generation module, connected to the laboratory power grid, is used to convert the laboratory power grid into stable alternating current; The load module is used to simulate the load during the startup and stable operation of shipboard motors; The power distribution module is used to connect or disconnect the shaft generator frequency converter cabinet, the auxiliary generator module and the load module from the ship's simulated power grid based on test commands.

2. The simulation system for a power generation system according to claim 1, characterized in that, The prime mover module includes: A frequency converter simulation cabinet is used to adjust the laboratory power grid to a preset voltage and frequency; The first motor is connected to the frequency converter simulation cabinet and is used to simulate and output the voltage and frequency output by the frequency converter simulation cabinet as the mechanical power of the ship's prime mover.

3. The simulation system for a power generation system according to claim 2, characterized in that, Also includes: The second motor is connected to the first motor and the shaft generator frequency converter cabinet, and is used to output AC power that fluctuates with the rotational speed to the shaft generator frequency converter cabinet under the drive of the mechanical power output by the first motor. The shaft generator frequency converter cabinet and the second motor constitute a shaft generator module.

4. The simulation system for a power generation system according to claim 1, characterized in that, The power distribution module includes a power distribution panel; The load module includes: The water pump load, connected to the distribution plate, is used to simulate the load during the stable startup of the ship's motor; An inductive load, connected to the distribution plate, is used to simulate the load during stable operation of the ship's motor; A resistive load, connected to the distribution plate, is used to simulate a purely resistive load on a ship.

5. The simulation system for a power generation system according to claim 3, characterized in that, The simulation system also includes a first transformer, which is connected between the shaft generator frequency converter cabinet and the power distribution module. The first transformer is used to adjust the voltage of the AC power output by the shaft generator frequency converter cabinet to the preset voltage of the simulated power grid on the ship and output it to the power distribution module.

6. The simulation system for a power generation system according to claim 5, characterized in that, The power distribution module includes: The first grid-connected cabinet, connected to the first transformer, is used to connect or disconnect the shaft generator module from the ship's simulated power grid based on test commands.

7. The simulation system for a power generation system according to claim 1, characterized in that, The simulation system also includes a second transformer connected between the auxiliary generator module and the power distribution module. The second transformer is used to adjust the voltage of the AC power output by the auxiliary generator module to the preset voltage of the simulated power grid on the ship and output it to the power distribution module.

8. The simulation system for a power generation system according to claim 7, characterized in that, The auxiliary generator module includes an auxiliary generator frequency converter cabinet; the power distribution module includes: The second grid-connected cabinet, connected to the second transformer, is used to connect or disconnect the auxiliary frequency converter cabinet from the ship's simulated power grid based on test commands.

9. The simulation system for a power generation system according to claim 8, characterized in that, The shaft-driven frequency converter cabinet includes a first rectifier unit and a first inverter unit, which are connected. The first rectifier unit is used to convert the AC power input from the motor simulation cabinet into DC power, and the first inverter unit is used to convert the DC power into stable AC power. The auxiliary frequency converter cabinet includes a second rectifier unit and a second inverter unit, which are connected together. The second rectifier unit is used to convert the AC power input from the laboratory power grid into DC power, and the second inverter unit is used to convert the DC power into stable AC power.

10. A simulation system for a power generation system according to claim 1, characterized in that, The simulation system also includes a monitoring module, which is connected to the shaft generator frequency converter and the power distribution module, for collecting, displaying and recording power grid parameters.

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