A ship multi-diesel generator grid-connected operation test platform

Abstract

The present application relates to diesel generator management and control and grid-connected test technical field, disclose a kind of ship multiple diesel generator grid-connected operation test platform, including diesel generator digitization module, control mode selection unit, local control unit, remote control unit and grid-connected control unit.The present application is by constructing the diesel generator digitization module of parameterizable configuration, different models, power and performance of diesel generator set and its parallel operation scene can be flexibly simulated, without relying on real ship environment and physical unit, greatly reduce test cost and cycle;By integrating local manual, remote control semi-automatic and full-automatic multi-mode collaborative control strategy, and establishing local mode highest priority arbitration mechanism, the cooperation of multiple units start-stop, fault simulation, acceleration and deceleration, voltage rise and intelligent grid-connected control is realized.

Description

Technical Field

[0001] This invention belongs to the field of diesel generator control and grid connection testing technology, specifically relating to a test platform for the grid connection operation of multiple diesel generators on ships. Background Technology

[0002] As ship electrical systems evolve towards higher reliability and redundancy, the parallel operation of multiple diesel generators has become standard on modern ships. Multi-generator grid connection technology, through the coordinated work of multiple generators, effectively improves the power supply capacity, load distribution flexibility, and fault redundancy of the ship's electrical grid, providing crucial support for ensuring the safe and stable navigation of ships. Correspondingly, the need for testing and verification of multi-diesel generator grid connection control systems is becoming increasingly prominent.

[0003] Currently, grid-connected testing of multiple diesel generators on ships primarily relies on semi-physical simulation platforms or fully digital simulation systems. Existing testing platforms typically use real-time simulators to build diesel generator models, connecting them to the actual controllers via physical I / O interfaces to form a hardware-in-the-loop testing environment. These platforms can simulate generator set operating characteristics to a certain extent, support controller function verification and performance testing, and have achieved basic automated testing processes. Operators can complete grid-connected operations by issuing commands through host computer software, eliminating the need for traditional manual adjustments.

[0004] However, existing technologies suffer from simplistic control modes and a lack of coordination mechanisms. While current platforms achieve automated control, the control modes are typically fixed at a single fully automatic or semi-automatic mode, lacking a flexible switching mechanism between local manual, semi-automatic, and fully automatic modes. This is particularly problematic in scenarios such as fault injection testing and extreme condition verification, where seamless coordination between real-time human intervention and automated control is impossible. Furthermore, existing platforms lack a clear control priority management mechanism, which can easily lead to conflicts between automated control and manual intervention when anomalies occur during testing, impacting test safety and operational efficiency.

[0005] Therefore, there is an urgent need for a testing platform that can balance low cost, high flexibility, and multiple control modes. Summary of the Invention

[0006] The purpose of this invention is to provide a test platform for the grid-connected operation of multiple diesel generators on ships, which addresses the problems of high cost and risk in real-ship testing, poor flexibility and insufficient scalability of existing platforms, and the single control mode, while offering the advantages of low cost, high flexibility, and multi-mode collaborative control.

[0007] Based on the above concept, the technical solution adopted by this invention is as follows: According to a first aspect of the present invention, a test platform for the grid-connected operation of multiple diesel generators on a ship is provided, comprising a diesel generator digital module, a control mode selection unit, a local control unit, a remote control unit, and a grid-connected control unit; The diesel generator digital module includes a diesel generator set, a control algorithm unit, an AC interface, a signal input interface, and a signal output interface. The diesel generator set consists of a diesel engine, a generator, and an exciter. The control algorithm unit is connected to both the diesel engine and the exciter, and is used to control the diesel engine and the exciter according to received control signals. The AC interface is connected to the generator for grid connection. The signal output interface is connected to the generator for outputting generator status parameters and voltage and current signals. The signal input interface is connected to the control algorithm unit for receiving externally input control signals. The control mode selection unit is used to select local control mode, semi-automatic control mode or automatic control mode. The local control unit is used to detect manual control signals and execute manual control commands in local control mode; The remote control unit is used to execute manually issued control commands in semi-automatic control mode and to execute automatic control commands in automatic control mode. The grid connection control unit is used to determine and execute grid connection operations based on the paralleling control signal and paralleling conditions.

[0008] In this embodiment, a fault detection unit and an emergency stop unit are also included; The fault detection unit is used to detect whether there is a fault in the generator after the system is started; The emergency shutdown unit is used to perform generator shutdown operation when a fault is detected or an emergency shutdown signal is received.

[0009] In this embodiment, the local control unit detects the presence of a manual control signal in real time in local control mode, and executes the corresponding manual control command when a manual control signal is detected.

[0010] In this embodiment, the remote control unit receives and executes manual control commands issued by the monitoring software in semi-automatic control mode; and receives and executes automatic control commands issued by the monitoring software in automatic control mode.

[0011] In this embodiment, the grid-connected control unit executes the following grid-connected control process: S1: Check if the generator is running; S2: Detect the presence of a vehicle merging control signal; S3: When a parallel control signal is present, determine whether the parallel conditions are met; S4: If the conditions for paralleling are met, execute the paralleling operation; S5: If the conditions for parallel operation are not met, adjust the excitation and speed until the conditions for parallel operation are met, and then perform the parallel operation. S6: After paralleling is completed, check if the switch is turned off. In this embodiment, the paralleling conditions include voltage difference, frequency difference, and phase angle difference, all of which are within a preset allowable range.

[0012] In this embodiment, the diesel generator digital module is a simulation model with configurable parameters. By modifying the model parameters, it can simulate diesel generator sets of different models, power, and performance.

[0013] In this embodiment, the control signals received by the signal input interface include control mode selection signals, start / stop commands, closing / opening commands, voltage ramping commands, acceleration / deceleration commands, emergency stop commands, and fault simulation signals.

[0014] In this embodiment, the local control mode has the highest control priority, and can be switched to the local control mode at any time to perform manual operation during the operation of the remote control unit.

[0015] The beneficial effects of this invention are as follows: 1. This invention constructs a parameterizable digital module for diesel generators, which can flexibly simulate diesel generator sets of different models, power and performance and their parallel operation scenarios without relying on actual ship environment and physical units, greatly reducing testing costs and cycles, and solving the problems of poor flexibility and insufficient scalability of the testing platform.

[0016] 2. This invention integrates local manual, remote semi-automatic and fully automatic multi-mode collaborative control strategies and establishes a local mode highest priority arbitration mechanism to achieve collaborative control of multi-unit start-up and shutdown, fault simulation, acceleration and deceleration, voltage boosting and bucking and intelligent grid connection, thereby improving the flexibility and safety of the testing process and solving the problems of single control mode and low degree of automation in traditional systems. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the diesel generator digital module of the present invention; Figure 2 This is a flowchart of the diesel generator control process of the present invention; Figure 3 This invention relates to a diesel engine parallel control strategy; Figure 4 This is a framework diagram of the diesel generator grid-connected operation test platform of the present invention. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0019] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The words “a” or “one” and similar terms used in this application specification and claims do not indicate a limitation of quantity, but rather indicate the presence of at least one. “A plurality” means two or more. The words “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” covers the element or object listed following “comprising” or “including” and its equivalents, and does not exclude other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The words “above” and / or “below” and similar terms are for ease of description only and are not limited to a location or spatial orientation. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] The technical concept of this invention includes: Current testing of multiple diesel generators connected to the grid on ships primarily relies on actual ship environments or physical generator platforms. However, actual ship testing requires valuable time on board, the test environment is complex to set up, and extreme conditions and fault simulations pose high safety risks. Existing land-based test platforms mostly use fixed-model physical diesel generator sets, which are limited by the number of units and site conditions, making it difficult to flexibly simulate parallel scenarios of multiple units with different power levels and characteristics. When adapting to new controllers or different ship power station configurations, hardware reconfiguration is often required, resulting in high modification costs and long cycles. In addition, traditional testing methods have single control modes, either relying entirely on manual adjustment and experience-based judgment, leading to low grid connection success rates and low operational efficiency, or using fixed-logic automatic control, unable to flexibly switch between local manual, semi-automatic, and fully automatic modes according to test requirements, especially lacking effective priority management mechanisms in multi-unit collaborative control and fault emergency handling. Therefore, existing technologies struggle to simultaneously meet the multi-dimensional requirements of testing cost, platform flexibility, control mode diversity, and intelligent grid connection control.

[0021] This solution addresses the aforementioned issues by proposing a test platform for the grid-connected operation of multiple diesel generators on ships, based on digital modeling and multi-mode hierarchical control. By constructing a parameterizable digital simulation module for diesel generators, replacing physical units with digital models, the platform allows for flexible modification of model parameters according to test requirements. It simulates different models, power outputs, and performance levels of diesel generators and their parallel operation scenarios, eliminating the need for frequent hardware replacements and significantly reducing testing costs and timelines. Simultaneously, the platform establishes three control modes: local manual, semi-automatic, and fully automatic. The local mode has the highest priority and can detect manual control signals in real time to execute corresponding commands, ensuring timely human intervention. The remote control mode supports manual or automatic commands issued by monitoring software, enabling flexible management of multiple units' start / stop, acceleration / deceleration, voltage adjustment, and fault simulation. Regarding grid-connected control, the platform dynamically determines whether voltage, frequency, and phase angle differences meet the grid-connected conditions by detecting generator operating status and grid-connected control signals. If not, it automatically adjusts excitation and speed until the conditions are met, then performs the grid-connected operation, thus achieving intelligent and high-success-rate grid-connected control.

[0022] Therefore, this invention effectively solves the problems of high cost, poor platform adaptability, rigid control mode, and reliance on manual experience in existing testing methods by replacing physical units with digital modeling and combining multi-mode collaborative control with intelligent grid connection strategies. It constructs a test platform for the grid-connected operation of multiple diesel generators on ships that can take into account economy, flexibility, safety and intelligence, and provides strong support for the research and development and verification of ship power systems.

[0023] This application provides a test platform for the grid-connected operation of multiple diesel generators on a ship, including a diesel generator digital module, a control mode selection unit, a local control unit, a remote control unit, and a grid-connected control unit; The diesel generator digital module includes a diesel generator set, a control algorithm unit, an AC interface, a signal input interface, and a signal output interface. The diesel generator set consists of a diesel engine, a generator, and an exciter. The control algorithm unit is connected to both the diesel engine and the exciter, and is used to control the diesel engine and the exciter according to received control signals. The AC interface is connected to the generator for grid connection. The signal output interface is connected to the generator for outputting generator status parameters and voltage and current signals. The signal input interface is connected to the control algorithm unit for receiving externally input control signals. The control mode selection unit is used to select local control mode, semi-automatic control mode or automatic control mode. The local control unit is used to detect manual control signals and execute manual control commands in local control mode; The remote control unit is used to execute manually issued control commands in semi-automatic control mode and to execute automatic control commands in automatic control mode. The grid connection control unit is used to determine and execute grid connection operations based on the paralleling control signal and paralleling conditions.

[0024] This invention constructs a parameterizable digital module for diesel generators, enabling flexible simulation of diesel generator sets of different models, power, and performance, as well as their parallel operation scenarios. It eliminates the need for a physical ship environment and generator sets, significantly reducing testing costs and time, and solving the problems of poor flexibility and insufficient scalability of testing platforms. By integrating local manual, remote semi-automatic, and fully automatic multi-mode collaborative control strategies, and establishing a local mode's highest priority arbitration mechanism, it achieves collaborative control of multi-generator start-up and shutdown, fault simulation, acceleration and deceleration, voltage boosting and depressurization, and intelligent grid connection, improving the flexibility and safety of the testing process and addressing the problems of traditional single control modes and low automation.

[0025] The following is in conjunction with the appendix Figures 1 to 4 This application provides a detailed description of a test platform for the grid-connected operation of multiple diesel generators on a ship.

[0026] In this embodiment, the test platform includes a diesel generator digitization module, a control mode selection unit, a local control unit, a remote control unit, a grid connection control unit, a fault detection unit, and an emergency shutdown unit. The diesel generator digitization module is the core component of the entire test platform, used to simulate the operating characteristics of a real diesel generator set.

[0027] In this embodiment, the diesel generator digital module includes a diesel generator set, a control algorithm unit, an AC interface, a signal input interface, and a signal output interface. The diesel generator set consists of a diesel engine, a generator, and an exciter. The diesel engine acts as the prime mover, driving the generator to rotate, while the exciter provides excitation current to establish a magnetic field. The control algorithm unit is connected to both the diesel engine and the exciter, and is used to adjust the diesel engine speed and the excitation current of the exciter according to received control signals, thereby controlling the generator's output voltage and frequency. The AC interface is connected to the generator's output terminal, enabling grid connection between multiple diesel generator digital modules and interconnection with simulated loads or the power grid. The signal output interface is connected to the generator's output terminal and a status monitoring point, and is used to output generator status parameters, voltage amplitude, current amplitude, and frequency signals to a monitoring system or controller in real time. The signal input interface is connected to the control algorithm unit, and is used to receive various externally input control signals, including control mode selection signals, start / stop commands, circuit breaker closing / opening commands, voltage ramping / deceleration commands, acceleration / deceleration commands, emergency stop commands, and fault simulation signals.

[0028] In this embodiment, the fault detection unit monitors the generator for faults in real time after system startup. Fault types include overvoltage faults, undervoltage faults, overfrequency faults, underfrequency faults, overcurrent faults, and short-circuit faults. When the fault detection unit detects a generator fault, or when the emergency stop unit receives an externally input emergency stop signal, the emergency stop unit immediately performs a generator shutdown operation, cutting off the diesel engine fuel supply and disconnecting the excitation circuit to ensure the safety of the testing process.

[0029] In this embodiment, the control mode selection unit is used to select a local control mode, a semi-automatic control mode, or an automatic control mode. The local control mode has the highest control priority and can be switched to at any time during the operation of the remote control unit to perform manual operation.

[0030] In this embodiment, when the local control mode is selected, the local control unit detects the presence of manual control signals in real time. Manual control signals are issued by the operator via the local operation panel or local monitoring software, and include generator start / stop control, fault simulation control, acceleration / deceleration control, voltage boost / buck control, and multi-unit parallel control. When a manual control signal is detected, the local control unit directly sends the manual control command to the signal input interface of the diesel generator's digital module. The control algorithm unit parses and executes the corresponding control operation, while simultaneously feeding back generator status parameters to the local monitoring interface in real time via the signal output interface.

[0031] In this embodiment, when the semi-automatic control mode is selected, the remote control unit receives manual control commands from the monitoring software. The monitoring software operator issues advanced control commands through the host computer interface, such as "start generator 1" or "increase the speed of generator 2". The remote control unit forwards these commands to the controller. After calculating and generating specific execution parameters, the controller sends them to the signal input interface of the diesel generator digital module, where the control algorithm unit executes the corresponding control operations.

[0032] In this embodiment, when the automatic control mode is selected, the remote control unit receives automatic control commands from the monitoring software. The monitoring software issues automatic operation commands according to a preset test plan. The remote control unit forwards the commands to the controller. The controller collects generator status parameters, voltage, current, and frequency information fed back by the diesel generator's digital module through its signal output interface in real time. It compares the collected status information with the preset control strategy, automatically calculates and outputs current and voltage control quantities to the signal input interface of the diesel generator's digital module. The control algorithm unit automatically implements closed-loop control of the diesel generator set, including automatic start / stop, automatic acceleration / deceleration, automatic voltage boosting / buckling, and automatic grid connection. The control functions implemented are consistent with those in the local manual mode.

[0033] In this embodiment, the grid-connected control unit executes the following grid-connected control process. First, it detects whether the generator is in operation; then, it detects whether a paralleling control signal exists. The paralleling control signal can be issued manually locally or generated by remote semi-automatic or automatic mode. When a paralleling control signal exists, it determines whether the paralleling conditions are met. The paralleling conditions include that the voltage difference, frequency difference, and phase angle difference between the generator to be paralleled and the bus are all within a preset allowable range. If the paralleling conditions are met, the paralleling operation is executed immediately, and the grid-connected switch is closed. If the paralleling conditions are not met, the excitation and speed are automatically adjusted. That is, the excitation current of the exciter is adjusted by the control algorithm unit to change the generator terminal voltage, and the throttle opening of the diesel engine is adjusted to change the generator speed, until the voltage difference, frequency difference, and phase angle difference all converge to the preset allowable range, and then the paralleling operation is executed. After the paralleling is completed, it continuously detects whether the grid-connected switch is open. If a switch open signal is detected, the grid-connected process ends.

[0034] In this embodiment, the diesel generator digital module is a configurable digital simulation model. By modifying the model parameters, different models, power outputs, and performance characteristics of diesel generator sets can be simulated. Model parameters include the diesel engine's rated power, governor characteristics, moment of inertia, and fuel consumption characteristics; the generator's rated voltage, rated frequency, synchronous reactance, and transient reactance; and the excitation method and response time constant of the exciter. Test personnel can flexibly configure multiple diesel generator digital modules with different parameter characteristics according to actual test requirements, constructing arbitrary combinations of multi-unit parallel operation test scenarios without replacing physical hardware.

[0035] In this embodiment, the workflow of the test platform is as follows: After system startup, the fault detection unit first detects whether there is a fault in the generator, and at the same time, the emergency stop unit detects whether there is an emergency stop signal. If a fault or emergency stop signal exists, the generator is stopped. If there is no fault and no emergency stop, the system enters the control mode selection stage. In local control mode, the manual control signal is detected and the corresponding manual control command is executed. In semi-automatic control mode, the manual control command is issued. In automatic control mode, the automatic control command is executed. When there is a need for parallel operation, the system enters the grid connection control process. By judging the parallel operation conditions and adjusting the excitation and speed, the parallel operation is finally completed. Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. The invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0036] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A test platform for the grid-connected operation of multiple diesel generators on a ship, characterized in that, It includes a diesel generator digital module, a control mode selection unit, a local control unit, a remote control control unit, and a grid connection control unit; The diesel generator digital module includes a diesel generator set, a control algorithm unit, an AC interface, a signal input interface, and a signal output interface. The diesel generator set consists of a diesel engine, a generator, and an exciter. The control algorithm unit is connected to both the diesel engine and the exciter, and is used to control the diesel engine and the exciter according to received control signals. The AC interface is connected to the generator for grid connection. The signal output interface is connected to the generator for outputting generator status parameters and voltage and current signals. The signal input interface is connected to the control algorithm unit for receiving externally input control signals. The control mode selection unit is used to select local control mode, semi-automatic control mode or automatic control mode. The local control unit is used to detect manual control signals and execute manual control commands in local control mode; The remote control unit is used to execute manually issued control commands in semi-automatic control mode and to execute automatic control commands in automatic control mode. The grid connection control unit is used to determine and execute grid connection operations based on the paralleling control signal and paralleling conditions.

2. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, It also includes a fault detection unit and an emergency stop unit; The fault detection unit is used to detect whether there is a fault in the generator after the system is started; The emergency shutdown unit is used to perform generator shutdown operation when a fault is detected or an emergency shutdown signal is received.

3. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, In local control mode, the local control unit detects in real time whether a manual control signal is present, and executes the corresponding manual control command when a manual control signal is detected.

4. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, In semi-automatic control mode, the remote control unit receives and executes manual control commands issued by the monitoring software; in automatic control mode, it receives and executes automatic control commands issued by the monitoring software.

5. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, The grid-connected control unit executes the following grid-connected control process: S1: Check if the generator is running; S2: Detect the presence of a vehicle merging control signal; S3: When a parallel control signal is present, determine whether the parallel conditions are met; S4: If the conditions for paralleling are met, execute the paralleling operation; S5: If the conditions for parallel operation are not met, adjust the excitation and speed until the conditions for parallel operation are met, and then perform the parallel operation. S6: After the paralleling is completed, check if the switch is turned off.

6. The test platform for parallel operation of multiple diesel generators on ships according to claim 5, characterized in that, The paralleling conditions include that the voltage difference, frequency difference, and phase angle difference are all within the preset allowable range.

7. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, The diesel generator digital module is a configurable simulation model that can simulate diesel generator sets of different models, power, and performance by modifying the model parameters.

8. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, The control signals received by the signal input interface include control mode selection signals, start / stop commands, closing / opening commands, voltage ramping commands, acceleration / deceleration commands, emergency stop commands, and fault simulation signals.

9. The test platform for parallel operation of multiple diesel generators on ships according to claim 1, characterized in that, The local control mode has the highest control priority and can be switched to at any time during the operation of the remote control unit to perform manual operations.

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