Overload inquiry method of power management system
By binding the required power value and address code for each high-power device in a ship power station, and dynamically adjusting the power management system according to the network power, the problem of overstarting the generator in traditional systems is solved, and efficient utilization of generators and energy savings are achieved.
Patent Information
- Application Number
- CN202411694161.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-04-15
AI Technical Summary
When a traditional ship power management system starts up a high-power device, it causes excessive start of the generator, resulting in waste of energy and inefficient generator use, especially when running at low loads.
By binding the required power value and address code in each high-power device, and dynamically adjusting the power management system based on the network power, it decides whether to start the generator to avoid unnecessary generator start.
It realizes efficient utilization of generators, reduces energy consumption of ship power stations, achieves energy saving and emission reduction effects, and improves the management efficiency of high-power equipment.
Smart Images
Figure CN119834446A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of ship power management systems, in particular to a heavy load inquiry method for a power management system. Background Art
[0002] The ship power management system (PMS) is a comprehensive system for managing the generation, distribution and use of power in ship power plants. Its main purpose is to ensure the stable, efficient and safe operation of the ship's power system. By real-time monitoring and control of the load of the ship's power plant, the output of the generator set and the power distribution, the PMS can optimize the use of power resources, reduce energy waste, and improve the reliability and safety of the entire ship's power system.
[0003] For some high-power equipment in ships, such as electric cargo oil pumps as important loads on oil tankers, due to their high power and the fact that there are usually multiple high-power equipment that need to be started by inquiry, in order to avoid a large impact on the power grid during the start-stop and operation stages, a variable frequency start control method is generally adopted, and the PMS is equipped with a heavy load inquiry start procedure. Conventional ship power management system manufacturers are generally switchboard manufacturers. Usually, the control box of the high-power equipment and the power management (PMS) of the ship power station gives a start inquiry signal of the switch quantity through the control box of the high-power equipment. The PMS checks the power on the grid and gives a start permission or gives a start permission after starting the standby machine. The high-power equipment gives an operation signal to complete a start process. Since the high-power equipment gives a starting inquiry signal of a switching quantity, when the control box of the high-power equipment receives the start permission signal from the PMS, the signal is shielded and disappears until another high-power equipment is started. Therefore, after the high-power equipment starts running, even if it is running at a low load, in order to prevent the sudden load of the inverter from having a major impact on the entire power grid or even causing the power station to collapse, the PMS must use the operating signal given by the controller to record the number of high-power equipment on the network and reserve the power required by the corresponding number of high-power equipment to cope with the sudden load of the inverter. In this way, the number of online high-power equipment is required to be closely related to the number of generators. The traditional overload query method of the power management system is mainly to start the generator as long as there is a high-power device inquiring the power management system, and record the number of high-power devices on the network. When the second high-power device sends a query to the power management system, the second generator is started by recording the number of high-power devices on the network, regardless of whether the power on the network can meet the use of the second high-power device; similarly, when the third or fourth high-power device sends a query to the power management system, the third generator or the fourth generator is started by recording the number of high-power devices on the network. It can be seen that the generator is started by recording the number of high-power devices on the network. Since there is a new high-power device in use, the generator must be started regardless of whether the high power on the network can meet the use of the new high-power device. In particular, starting more generators makes the power on the network excessive, the efficiency of the generator cannot be fully utilized, and the ship power station has the problem of high energy consumption. Especially in the current situation where the requirements for carbon emissions are very strict, it is very important to achieve energy conservation and emission reduction so that the efficiency of the generator can be greatly improved. Summary of the invention
[0004] The object of the present invention is to provide a heavy load inquiry method of a power management system which can fully utilize the efficiency of generator use, so as to reduce energy consumption of a ship power station and achieve the effect of energy saving and emission reduction.
[0005] The overload query method of the power management system of the present invention comprises the following steps:
[0006] S1. Each high-power device binds its required power value and address code and inputs them into its own register, and sends the address code to the power management system;
[0007] S2. The power management system compares the received address code with the pre-stored address code. If the received address code is equal to the pre-stored address code, the required power value in the corresponding register is read;
[0008] S3. The power management system compares the required power value with the grid power. If the grid power meets the required power value, the other generator is not started. If the grid power does not meet the required power value, the other generator is started.
[0009] S4. When the power management system receives a new address code, it reads the new required power value in the corresponding register through the address code and compares it with the last required power value. If it is greater than the last required power value, the new required power value is used as the required power value and the process returns to step S3. If it is less than the last required power value, the last required power value is used as the required power value and the process returns to step S3.
[0010] The overload query method of the power management system described in the present invention binds the respective required power values and address codes of each high-power device and inputs them into respective registers. The power management system establishes contact with each high-power device according to the received address code, reads the required power value in the corresponding register, and compares the required power value with the on-grid power. If the on-grid power meets the required power value, no other generator is started. If the on-grid power does not meet the required power value, another generator is started. When a new high-power device is running, the power management system receives the address code corresponding to the new high-power device, reads the new required power value in the corresponding register through the address code and compares it with the last required power value. If it is greater than the last required power value, the new required power value is used as the required power value. The required power value is compared with the on-grid power. If the on-grid power meets the required power value, no other generator is started. If the on-grid power does not meet the required power value, another generator is started. If it is less than the last required power value, the last required power value is used as the required power value. , compare the required power value with the grid power. If the grid power meets the required power value, no other generator will be started. If the grid power does not meet the required power value, another generator will be started, thereby realizing continuous and uninterrupted inquiry. Whether the new high-power equipment needs to start another generator is only related to the grid power, and has nothing to do with the number of high-power equipment recorded on the grid. If the grid power meets the demand, there is no need to start another generator, thereby making full use of the generator efficiency, enabling the ship power station to reduce energy consumption and achieve energy conservation and emission reduction effects; in addition, since the required power value corresponds to the address code and each high-power equipment one by one, the power management system can better manage each high-power equipment; in addition, since the required power values are stored in the respective registers of each high-power equipment, after the generator is started, the power will no longer be reserved in the grid, but the register will always keep the input required power value. When the high-power equipment gives a new power value, the power management system reads the new power value from the register and compares it with the previous required power value, thereby improving the efficiency of heavy load inquiry.
[0011] As a preferred solution of the present invention, step S3 also includes, after starting another generator, determining whether the current grid power meets the required power value, if not, not allowing new high-power equipment to run, and then starting another generator, determining whether the current grid power meets the required power value, then allowing new high-power equipment to run.
[0012] As a preferred solution of the present invention, in step S1, each high-power device is connected to its respective register via a PLC address unit, and each high-power device inputs the required power value and address code into its respective register via its respective PLC address unit.
[0013] As a preferred solution of the present invention, in step S2, the power management system is connected to the register of each high-power device through the MODBUS communication protocol, and the power management system transmits the address code through the MODBUS communication protocol to read the required power value in the corresponding register of each high-power device.
[0014] As a preferred solution of the present invention, in step S3, if the grid power does not meet the required power value, the power management system sends a start signal to the power station, and the power station starts another generator. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The figure is a flow chart of a heavy load inquiry method of a power management system according to the present invention. DETAILED DESCRIPTION
[0016] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0017] A heavy load query method for a power management system, such as Figure 1 As shown, the following steps are included:
[0018] S1. Each high-power device binds its required power value and address code and inputs them into its own register, and sends the address code to the power management system.
[0019] S2. The power management system compares the received address code with the pre-stored address code. If the received address code is equal to the pre-stored address code, the required power value in the corresponding register is read.
[0020] S3. The power management system compares the required power value with the grid power. If the grid power meets the required power value, the other generator is not started. If the grid power does not meet the required power value, the other generator is started.
[0021] S4. When the power management system receives a new address code, it reads the new required power value in the corresponding register through the address code and compares it with the last required power value. If it is greater than the last required power value, the new required power value is used as the required power value and the process returns to step S3. If it is less than the last required power value, the last required power value is used as the required power value and the process returns to step S3.
[0022] After starting another generator, determine whether the current grid power meets the required power value. If not, new high-power equipment is not allowed to run. Then start another generator again. If it is determined that the current grid power meets the required power value, new high-power equipment is allowed to run.
[0023] Taking cargo oil pump as an example of high-power equipment, registers are set inside the pump control system of cargo oil pump. The pump control system inputs the required power value of cargo oil pump into the register through PLC address unit, and gives a start-up inquiry signal to the power management system of power station. After receiving the signal, the power management system of power station will read the required power value in the register through MODBUS communication protocol and compare it with the power on the grid. If the power on the grid meets the required power value, no other generator will be started. If the power on the grid does not meet the required power value, the power station will give a start signal or start the standby machine before giving a start signal. After giving the start signal, the power station will no longer reserve power in the grid, but the register will always keep the input required power value. When the pump control system inputs a new power value, the power management system reads the new power value from the register and compares it with the last required power value. If it is greater than the last required power value, the new required power value will be used as the required power value. If it is less than the last required power value, the last required power value will be used as the required power value, and the required power value will be compared with the power on the grid.
[0024] Taking a ship under construction as an example, the test results of the traditional heavy load inquiry method and the heavy load inquiry method of the present invention are shown in the following table:
[0025]
[0026]
[0027]
[0028]
[0029] It can be seen from the table that: when starting the second cargo oil pump, the ship using the traditional heavy-load inquiry method needs two generators to run, and when starting the fourth cargo oil pump, three generators need to be turned on. After using the heavy-load inquiry method of the present invention, the second generator is turned on when the load of four and five cargo oil pumps exceeds 20% or the load of three cargo oil pumps exceeds 40%; the third generator is started when the load of five cargo oil pumps exceeds 80% or all six cargo oil pumps exceed 70%. The efficiency of the generators of ships using the traditional heavy-load inquiry method is almost all below 55%, especially when the load rate is less than 30%, not only the fuel consumption is large, but also the damage to the generator is large. After using the heavy-load inquiry method of the present invention, the efficiency of the generators under various working conditions is almost between 45% and 85%. It can be seen that the invention greatly makes full use of the efficiency of the generator, reduces fuel consumption, and achieves the effect of energy saving and emission reduction.
[0030] The above embodiments are only used to illustrate the detailed scheme of the present invention, and the present invention is not limited to the above detailed scheme, that is, it does not mean that the present invention must rely on the above detailed scheme to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., are all within the protection scope and disclosure scope of the present invention.
Claims
1. A heavy load query method for a power management system, comprising the following steps: S1. Each high-power device binds its required power value and address code and inputs them into its own register, and sends the address code to the power management system; S2. The power management system compares the received address code with the pre-stored address code. If the received address code is equal to the pre-stored address code, the required power value in the corresponding register is read; S3. The power management system compares the required power value with the grid power. If the grid power meets the required power value, the other generator is not started. If the grid power does not meet the required power value, the other generator is started. S4. When the power management system receives a new address code, it reads the new required power value in the corresponding register through the address code and compares it with the last required power value. If it is greater than the last required power value, the new required power value is used as the required power value and the process returns to step S3. If it is less than the last required power value, the last required power value is used as the required power value and the process returns to step S3.
2. The overload query method of the power management system according to claim 1, characterized in that: The step S3 also includes, after starting another generator, determining whether the current grid power meets the required power value, if not, not allowing new high-power equipment to run, and then starting another generator, determining whether the current grid power meets the required power value, then allowing new high-power equipment to run.
3. The overload query method of the power management system according to claim 1, characterized in that: In the step S1, each high-power device is connected to its respective register via a PLC address unit, and each high-power device inputs the required power value and address code into its respective register via its respective PLC address unit.
4. The overload query method of the power management system according to claim 1, characterized in that: In step S2, the power management system is connected to the register of each high-power device through the MODBUS communication protocol, and the power management system transmits the address code through the MODBUS communication protocol to read the required power value in the corresponding register of each high-power device.
5. The overload query method of the power management system according to claim 1, characterized in that: In step S3, if the grid power does not meet the required power value, the power management system sends a start signal to the power station, and the power station starts another generator.