Power station control method of ship generator

Abstract

The invention relates to the technical field of ship generator control, and discloses a power station control method for a ship generator, which comprises the following steps: acquiring the working state of a ship power station, and judging whether the power station is in an automatic control mode and whether the light load transfer function is normal are simultaneously established; if yes, entering a generator operation mode judgment process; judging whether the generator is in a parallel operation state, if so, entering a generator light load judgment process and entering a load transfer judgment process at the same time; whether the generator is in a light load state is judged, if yes, a light load pre-transfer alarm is given after a first preset time is delayed, a fuel oil switching signal is obtained after a second preset time interval, and a light load marking signal is sent through a distribution board; judging whether a generator light load marking signal is received or not, and if yes, entering a load transfer completion judgment process; whether the load is transferred or not is judged, and if yes, a generator splitting signal is sent out; the method has the advantage of improving the automation level.

Description

Technical Field

[0001] The present invention relates to the technical field of ship design, and in particular to a power station control method for a ship generator. Background Art

[0002] During normal operation, marine generators typically burn cheaper and more viscous heavy fuel oil (HFO) to reduce fuel costs. However, during periods of low load and during startup / shutdown, more expensive and higher quality light fuel oil (LFO) is required to prevent the use of HFO during this process from causing severe carbon deposits in the generator combustion chamber and damaging the generator's normal performance.

[0003] As the degree of automation of ship power stations becomes higher and higher, when the ship's power load is low under normal operating conditions, the ship's power station control system will control a generator to unload the load and stop working. However, since the generator does not allow long-term low-load operation or shutdown in heavy oil working mode, the power station control system cannot complete the relevant decoupling and shutdown control functions, which reduces the degree of automation of the power station. The relevant functions can only be performed by the crew by observing the load situation of the power station in real time, and manually judging and operating the relevant processes after manual judgment (after observing and judging that a generator needs to be stopped, first switch the generator from heavy oil mode to light oil mode, and then manually transfer the load, decouple the light-load generator and shut it down). This manual observation, judgment and tedious operation have brought a burden to the crew's daily work, especially for ships with unmanned cabins. The power station control system cannot automatically decoupling and shut down, and cannot meet the crew's daily operation requirements.

[0004] Therefore, a power station control method for a ship generator is provided to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to solve the problem that the existing power plant control system cannot automatically de-energize and shut down the power plant and cannot meet the daily operation requirements of the crew.

[0006] A first aspect of the present invention provides a power station control method for a ship generator, the power station control method for a ship generator comprising:

[0007] Obtain the working status of the ship's power station and determine whether the power station is in automatic control mode and the light load transfer function is normal; if so, enter the generator operation mode determination process;

[0008] Enter the generator operation mode judgment process to determine whether the generator is in parallel operation. If so, enter the generator light load judgment process and the load transfer judgment process at the same time;

[0009] Enter the generator light load judgment process to determine whether the generator is in a light load state. If so, a light load pre-transfer alarm is issued after a first preset time delay, and a fuel switching signal is obtained after a second preset time interval, and a light load flag signal is sent through the distribution board;

[0010] Enter the load transfer judgment process to determine whether the generator light load flag signal is received. If so, enter the load transfer completion judgment process;

[0011] Enter the load transfer completion judgment process to determine whether the load transfer is completed. If so, a generator decoupling signal is issued.

[0012] Furthermore, it also includes:

[0013] If the power station is in automatic control mode and the light load transfer function is normal but not established at the same time, the original working state of the ship's power station will be maintained;

[0014] If the generator is not in parallel operation, the original working state of the ship's power station shall be maintained;

[0015] If the generator is in a heavily loaded state, the standby generator will be started to share the power load;

[0016] If the generator light load flag signal is not received, the generator will maintain its original working state;

[0017] If the load transfer is not completed, re-determine whether the load transfer is completed.

[0018] Furthermore, the method further includes: obtaining a light-load generator disconnection signal, and generating a light-load generator alarm signal according to the light-load generator disconnection signal.

[0019] Furthermore, the generator overload mark value is when the power load reaches 90% of the total rated load of the generator.

[0020] Furthermore, the generator light load mark value is that the total power load of the ship is less than 70% of the total rated load after deducting one from the number of currently operating generators.

[0021] Furthermore, the first preset time length is 60s, and the second preset time length is 20min.

[0022] Furthermore, the light-load generator receives a disconnection signal, the light-load generator sends an alarm signal before disconnection, and the light-load generator maintains a no-load operation state after disconnection.

[0023] The present invention includes monitoring the generator load and generator operating mode, issuing a light load pre-alarm signal, automatically transferring the load, and automatically decoupling the generator, so that the generator that can only be started and stopped under light oil conditions can automatically transfer the load and decouple and shut down when operating normally using heavy oil. This optimizes the control logic of the ship's generator shutdown when running on heavy oil, improves the degree of automation of the ship's power station, and reduces the burden on the crew when operating the generator decoupling and shutting down. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a control program block diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the light-load decoupling of the generator of the present invention.

[0026] Figure 3 This is a structural diagram of the fuel pipeline and control signal of the present invention. DETAILED DESCRIPTION

[0027] An embodiment of the present invention provides a power station control method for a ship generator, comprising: obtaining the operating status of the ship power station, determining whether the power station is in automatic control mode and whether the light-load load transfer function is normal; if so, entering a generator operation mode determination process; if not, maintaining the original operating status of the ship power station; entering a generator operation mode determination process, determining whether the generator is in a parallel operation state; if so, entering a generator light-load determination process and a load transfer determination process; if not, maintaining the original operating status of the ship power station; entering a generator light-load determination process, determining whether the generator is in a light-load state; if so, issuing a light-load load pre-transfer alarm after a first preset time delay; obtaining a fuel switching signal after a second preset time interval, and sending a light-load flag signal through a switchboard; entering a load transfer determination process, determining whether the generator light-load flag signal is received; if so, entering a load transfer completion determination process; if not, maintaining the original operating status of the generator; entering a load transfer completion determination process, determining whether the load transfer is complete; if so, issuing a generator disconnect signal; if not, re-determining whether the load transfer is complete. The main purpose of the present invention is to solve the problem that existing power station control systems cannot automatically disconnect and shut down the generator and cannot meet the daily operating requirements of crew members.

[0028] The terms "first," "second," "third," "fourth," and the like (if any) in the description and claims of the present invention and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0029] For ease of understanding, the specific process of the embodiment of the present invention is described below. The first embodiment of the power station control method of the ship generator provided by the present invention includes:

[0030] Obtain the working status of the ship's power station and determine whether the power station is in automatic control mode and the light load transfer function is normal. If so, enter the generator operation mode determination process. If not, maintain the original working status of the ship's power station.

[0031] Enter the generator operation mode judgment process to determine whether the generator is in parallel operation. If so, enter the generator light load judgment process and the load transfer judgment process at the same time. If not, maintain the original working state of the ship power station;

[0032] Enter the generator light load judgment process to determine whether the generator is in a light load state. If so, a light load pre-transfer alarm is issued after a first preset time delay, and a fuel switching signal is obtained after a second preset time interval, and a light load flag signal is sent through the distribution board;

[0033] Enter the load transfer judgment process to determine whether the generator light load flag signal is received. If so, enter the load transfer completion judgment process. If not, maintain the original working state of the generator;

[0034] Enter the load transfer completion judgment process to determine whether the load transfer is completed. If so, a generator decoupling signal is issued. If not, re-determine whether the load transfer is completed.

[0035] The method further includes: obtaining a light-load generator switch disconnection signal, and generating a light-load generator alarm signal according to the light-load generator switch disconnection signal.

[0036] The generator heavy load mark value is when the power load reaches 90% of the total rated load of the generator; the generator light load mark value is when the total power load of the ship is less than 70% of the total rated load after deducting one from the number of currently running generators.

[0037] The first preset time length is 60 seconds, and the second preset time length is 20 minutes.

[0038] The lightly loaded generator will send out an alarm signal before decoupling and will remain in no-load operation after decoupling, notifying the crew through the alarm to manually stop the generator.

[0039] By adding heavy oil heaters and other related control equipment, ship generators can realize the function of starting and stopping the generator with heavy oil. At this time, the generator directly uses heavy oil to start or stop.

[0040] When the generator is running alone or in parallel, if the program detects that the load of one or more generators is lower than the light load set value, a generator light load alarm will be directly issued for the light load generator.

[0041] like Figure 1 The power station control method of a ship generator shown is used for a control scheme for automatically shutting down the ship generator in heavy oil mode, including monitoring the generator load and generator operating mode, issuing a light load pre-alarm signal, automatically transferring the load, and automatically decoupling the generator, so that the ship generator can automatically shut down in heavy oil mode.

[0042] The generator light load transfer function only operates normally when two or more generators are operating in parallel. When the program is in automatic control mode and the generator light load transfer function is normal, if the on-grid generator is detected to be light loaded, a light load pre-transfer alarm will be issued after a 60s delay.

[0043] The generator light load mark value can be calculated by the following formula:

[0044] Total power load < DG×(n-1)×k

[0045] Wherein, DG is the rated load of the ship generator, which is set to 650kW in this embodiment, n is the number of generators on the grid, and k is the generator light load transfer mark value, which is 70% in this embodiment.

[0046] like Figure 2 As shown in the schematic diagram of light load decoupling of generators, when three generators are running on the grid, when the program monitors that the total power load is lower than 910kW (=650×(3-1)×70%), a light load pre-transfer alarm will be issued; when two generators are running on the grid, when the program monitors that the total power load is lower than 455kW (=650×(2-1)×70%), a light load pre-transfer alarm will be issued and transmitted to the duty crew room and the engine room control space through the ship's extended alarm system to remind the crew.

[0047] like Figure 3As shown in the schematic diagram of the generator oil circuit and signal control, when the distribution board detects that the on-grid generator is underloaded, an alarm message will be issued in the duty crew room through the cabin extension alarm system, reminding the duty crew to manually switch the fuel and switch the generator fuel from heavy oil to light oil by controlling the switching of the fuel supply valve.

[0048] At the same time, before the switchboard performs load transfer, considering that the crew needs to get from the living quarters or the duty room to the engine to perform the relevant oil circuit switching operations, a certain amount of preparation time is required for the crew. Therefore, after the light load pre-transfer alarm is issued, the switchboard will delay for 20 minutes before issuing the generator light load signal, and at the same time perform load adjustment to transfer the operating load of one generator to the remaining on-grid generators, and monitor in real time whether the generator load transfer is completed;

[0049] When the load transfer is completed, the ship's power station sends a generator disconnect signal, disconnects the main switch of the generator, and issues a main switch disconnection alarm. The generator then idles without load, waiting for manual shutdown by the crew.

[0050] In addition to the above-mentioned light load transfer control, the present invention also provides an alarm function for the generator light load, including a generator low load alarm, a generator light load pre-transfer alarm, and a generator main switch disconnection alarm, as follows:

[0051] 1. The generator low-load alarm is issued when the ship's power station detects that a generator's load is below 30%. After a 60-second delay, the alarm is activated to eliminate any load fluctuations. Because generators should not be operated at too low a load in heavy fuel oil mode, this alarm serves to alert the crew that the generator load is too low and that the generator fuel needs to be switched from heavy fuel oil to light fuel oil, thereby transferring the load.

[0052] 2. The generator light load pre-transfer alarm is activated when the ship's power station detects that the total ship's electrical load is less than the generator light load indicator. After a 60-second delay, it will be issued to eliminate power load fluctuations. This alarm serves to alert the crew of an impending automatic light load transfer. An extended alarm is also issued in the crew quarters, prompting the crew to switch the fuel of the generator to be transferred from heavy fuel oil to light fuel oil. This alarm is delayed for 20 minutes to allow the crew ample time to switch fuel and prevent mixing of heavy and light fuel oil in the generator fuel lines. Furthermore, if the generator is equipped with systems and functions for heavy fuel oil start-stop, the 20-minute alarm delay can be shortened or eliminated.

[0053] 3. Generator main switch disconnection alarm: After the generator load transfer is completed, the alarm is issued after the main switch is disconnected. Because the generator is still idling without load after the main switch is disconnected, and long-term idling of the generator will have an adverse effect on the body itself, this alarm is used to remind the crew to stop idling the generator in time to avoid damage to the generator.

[0054] This application can ensure that the ship's generator shuts down normally in heavy oil mode, avoids damage to the generator itself caused by heavy oil shutdown, improves the automation level of the ship's power station, and achieves the purpose of reducing the workload of the crew.

[0055] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power plant control method for a ship generator, characterized in that: include: Obtain the working status of the ship's power station and determine whether the power station is in automatic control mode and the light load transfer function is normal; If yes, then enter the generator operation mode judgment process; Enter the generator operation mode judgment process to determine whether the generator is in parallel operation. If so, enter the generator light load judgment process and the load transfer judgment process at the same time; Enter the generator light load judgment process to determine whether the generator is in a light load state. If so, a light load pre-transfer alarm is issued after a first preset time delay, and a fuel switching signal is obtained after a second preset time interval, and a light load flag signal is sent through the distribution board; Enter the load transfer judgment process to determine whether the generator light load flag signal is received. If so, enter the load transfer completion judgment process; Enter the load transfer completion judgment process to determine whether the load transfer is completed. If so, a generator decoupling signal is issued.

2. The power plant control method of a ship generator according to claim 1, characterized in that: Also includes: If the power station is in automatic control mode and the light load transfer function is normal but not established at the same time, the original working state of the ship's power station will be maintained; If the generator is not in parallel operation, the original working state of the ship's power station shall be maintained; If the generator is in a heavily loaded state, the standby generator will be started to share the power load; If the generator light load flag signal is not received, the generator will maintain its original working state; If the load transfer is not completed, re-determine whether the load transfer is completed.

3. The power station control method of a ship generator according to claim 2, characterized in that: Also includes: A light-load generator disconnection signal is obtained, and a light-load generator alarm signal is generated according to the light-load generator disconnection signal.

4. The power station control method of a ship generator according to claim 3, characterized in that: The generator overload mark value is when the power load reaches 90% of the total rated load of the generator.

5. The power station control method of a ship generator according to claim 4, characterized in that: The generator light load mark value is that the total power load of the ship is less than 70% of the total rated load after deducting one from the number of currently running generators.

6. The power station control method of a ship generator according to claim 5, characterized in that: The first preset time length is 60 seconds, and the second preset time length is 20 minutes.

7. The power plant control method for a ship generator according to claim 6, characterized in that: It also includes the light-load generator receiving a decoupling signal, the light-load generator sending an alarm signal before decoupling, and the light-load generator maintaining a no-load operating state after decoupling.

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