CN115864548A - Energy recovery control method based on oil-electricity dual-drive ship - Google Patents
Energy recovery control method based on oil-electricity dual-drive ship Download PDFInfo
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- CN115864548A CN115864548A CN202211669638.5A CN202211669638A CN115864548A CN 115864548 A CN115864548 A CN 115864548A CN 202211669638 A CN202211669638 A CN 202211669638A CN 115864548 A CN115864548 A CN 115864548A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 65
- 230000002457 bidirectional effect Effects 0.000 claims description 17
- 238000004146 energy storage Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 3
- 230000006855 networking Effects 0.000 abstract description 7
- 230000002441 reversible effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The invention discloses an energy recovery control method based on a gasoline-electric dual-drive ship, which comprises the following steps: setting an electric quantity threshold according to daily load power consumption of a ship power system; if the residual electric quantity of the lithium battery pack is lower than the electric quantity threshold value, starting a standby generator set to supply power to a direct-current bus of a ship power system; and the lithium battery pack is charged by utilizing the energy output by the standby generator set to exceed the power consumption part of the daily load. The oil-electricity dual-drive ship adopts a direct-current networking system, the power supply output is connected into the direct-current networking through the chopping module, the braking energy generated by emergency braking is effectively utilized to the maximum extent, the cost is saved, and the energy loss is avoided.
Description
Technical Field
The invention relates to the technical field of ship driving, in particular to an energy recovery control method based on a gasoline-electric dual-drive ship.
Background
Coal and fuel have been the main power supports for ships for more than two centuries in the past, and ships on the ocean are getting bigger and more advanced, and the operation time is also prolonged. Currently, diesel powered vessels remain the most common form of vessel around the world. However, in various developments in the field of marine power, hybrid propulsion is an emerging concept, is popular with many people, and will continue to develop in the coming years.
Because of the characteristics of the diesel engine, the output power of the diesel engine can only be larger than or equal to zero, if the energy cannot be consumed, the energy can flow backwards, the phenomenon is called reverse work, the reverse work phenomenon can cause the serious consequences of failure and damage of the diesel engine, power loss of a ship, out of control and the like, only consumption equipment can be additionally arranged for processing in the traditional power mode, but energy waste is generated.
Therefore, how to recycle the redundant energy output by the diesel engine of the oil-electricity dual-drive ship becomes a problem to be solved urgently at present.
Disclosure of Invention
In view of this, an embodiment of the present invention provides an energy recovery control method based on a gasoline-electric dual-drive ship, so as to solve the problem in the prior art that a reverse power phenomenon is caused by sudden emergency braking of a ship by using a diesel engine to generate power, and energy is wasted by additionally installing a consumption device.
The embodiment of the invention provides an energy recovery control method based on a gasoline-electric dual-drive ship, which comprises the following steps:
setting an electric quantity threshold according to daily load power consumption of a ship power system;
if the residual electric quantity of the lithium battery pack is lower than the electric quantity threshold value, starting a standby generator set to supply power to a direct-current bus of a ship power system;
and the lithium battery pack is charged by utilizing the energy output by the standby generator set to exceed the power consumption part of the daily load.
Optionally, the charge threshold is set to 20% of the full charge of the lithium battery pack.
Optionally, the method further comprises:
when the ship is emergently braked, the energy flows back to the direct current bus system;
and recovering the overflowing energy through a power control system and charging the lithium battery pack.
Optionally, the method further comprises:
in the pure battery propulsion mode, if the propulsion motor suddenly brakes and the braking energy exceeds a first preset value, the braking energy is fed back to the inverter module and the chopper module; the daily load is supplied with power through the inversion module; and charging the lithium battery pack through the chopping module.
Optionally, the first preset value is set according to daily load power consumption.
Optionally, the method further comprises:
and if the voltage of the direct current bus exceeds a second preset value and the lithium battery pack meets the charging condition, controlling the lithium battery pack to be converted from the power supply state to the charging state.
Optionally, the method further comprises:
when the voltage of the direct current bus is lower than the daily load required value, the bidirectional chopping module is in a boosting mode, and the redundant energy is output to the direct current bus through the bidirectional chopping module;
when the voltage of the direct-current bus is higher than the daily load required value, the bidirectional chopping module is in a voltage reduction mode, and the redundant energy is input into the energy storage unit through the bidirectional chopping module.
Optionally, the method further comprises:
when the lithium battery pack triggers a charging condition, a control module of the lithium battery pack sends a charging signal to a superior control module;
the upper-level control module starts a standby generator set;
the standby generator set is connected into the direct current bus, supplies power to the daily load and charges the lithium battery pack.
Optionally, the method further comprises:
and the power transfer between the lithium battery pack and the standby generator set is realized through the power distribution and droop curve.
Optionally, the backup generator set comprises: any one or more of a lithium battery pack, a diesel engine and a shaft motor.
The embodiment of the invention has the following beneficial effects:
the oil-electricity dual-drive ship adopts a direct-current networking system, the power supply output is connected into the direct-current networking through the chopping module, the braking energy generated by emergency braking is effectively utilized to the maximum extent, the cost is saved, and the energy loss is avoided.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 shows a schematic diagram of charging a lithium battery based on an energy recovery control method of a gasoline-electric dual-drive ship in an embodiment of the invention;
FIG. 2 is a block diagram of a bi-directional DC/DC converter in an embodiment of the present invention;
FIG. 3 illustrates a daily load energy feedback flow single line diagram in an embodiment of the present invention;
fig. 4 shows a single line diagram illustrating energy consumption feedback flow of a lithium battery and a daily load according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The embodiment of the invention provides an energy recovery control method based on a gasoline-electric dual-drive ship, which comprises the following steps:
and setting an electric quantity threshold value according to the daily load power consumption of the ship power system.
In this embodiment, if the ship is operated in the standby mode, the power is supplied to the whole ship only by the lithium battery device. When the electric quantity of the lithium battery device is lower than the set electric quantity threshold value, the lithium battery device needs to be switched from a discharging state to a charging state.
And if the residual electric quantity of the lithium battery pack is lower than the electric quantity threshold value, starting a standby generator set to supply power to a direct-current bus of the ship power system.
In this embodiment, if the oil-electric dual-drive ship operates in a state where the lithium battery device supplies power alone and the lithium battery device has a low charge, the standby generator set, for example, a diesel engine, is started to supply power to the dc bus of the ship power system. In a specific embodiment, the oil-electricity dual-drive ship is a dual-function motor, the shaft motor can be used as a motor to operate, and can also be used for providing daily electricity for a load for a generator under the working condition of a host, and meanwhile, surplus power is used for charging a lithium battery.
And the lithium battery pack is charged by utilizing the energy output by the standby generator set to exceed the power consumption part of the daily load.
As an alternative embodiment, the charge threshold is set to 20% of the full charge of the lithium battery pack.
In the present embodiment, taking a certain oil-electric dual-drive hybrid tug propulsion system as an example, the operation modes are shown in table 1. The standby generator set of the system starts power generation when the lithium battery pack is damaged and the SOC is less than 20% or other ship emergency states so as to ensure the stable power supply of a ship power grid system and the safe ship navigation. The residual electric quantity of the lithium battery pack is monitored through the battery management system BMS, the equipment power consumption under different working conditions is combined, and if the electric quantity of the lithium battery pack is reduced to the lower limit of the threshold value, the standby generator set is started. Lithium battery charging is equivalent to the lithium cell and uses as the load, and when the lithium cell triggered the charging condition, for example SOC is low, the lithium cell can ask for power to the direct current bus, and generating set can accomplish to lithium battery charging to direct current bus input power. A typical lithium battery charging energy diagram is shown in figure 1.
TABLE 1 Main conditions of the marine system
The oil-electricity dual-drive ship adopts a direct-current networking system, the output of a power supply is connected into the direct-current networking through a chopping module, the braking energy generated by emergency braking is effectively utilized to the maximum extent, the cost is saved, and the energy loss is avoided.
As an optional implementation, further comprising:
when the ship is emergently braked, the energy flows back to the direct current bus system;
and recovering overflow energy through a power control system and charging the lithium battery pack.
In the embodiment, when a propulsion motor suddenly brakes, an inverter module drives the propulsion motor to output reverse torque so as to achieve the purpose of rapid braking, at the moment, the propulsion motor feeds back energy to the inverter module, the voltage of a direct-current bus is increased, a small part of energy can be used by a daily load, if the rest energy is directly fed back to a generator set through a rectifier module, at the moment, the generator is changed into a motor to run, the balance between a rotor rotating magnetic field and a stator armature magnetic field is broken, theoretically, the generator runs in reverse power and is only a motor running mode, the generator cannot be seriously damaged, but serious mechanical damage can be caused to a prime motor, and therefore the rest energy is consumed through a daily power supply through chopping, and partial energy waste can be caused. Therefore, in this embodiment, when the ship is emergently braked, energy may flow back to the dc bus system, and the power control system PMS may recover this part of energy to charge the lithium battery pack, thereby achieving efficient utilization of energy.
As an optional implementation, further comprising:
under the pure battery propulsion mode, if the propulsion motor suddenly brakes and the braking energy exceeds a first preset value, the braking energy is fed back to the inverter module and the chopper module; the daily load is supplied with power through the inversion module; and charging the lithium battery pack through the chopping module.
The core of the voltage stabilization control strategy of the hybrid power system aims to exert the working characteristics of each energy source and stabilize the load power fluctuation caused by the change of the sailing working condition. And when the voltage of the direct current bus is kept stable, the coordination control and power distribution of each energy storage unit need to be fully considered, and each energy storage element is ensured to work in a normal working range.
When the propulsion motor is suddenly braked, the inversion module drives the propulsion motor to output reverse torque so as to achieve the purpose of rapid braking, at the moment, the propulsion motor feeds back energy to the inversion module, the voltage of a direct-current bus can be increased, a small part of energy can be used by daily loads, if the rest energy is directly fed back to a generator set through the rectification module, the generator is changed into a motor to run at the moment, the balance between a rotor rotating magnetic field and a stator armature magnetic field is broken, theoretically, the generator runs in reverse power and is only a motor running mode, the generator cannot be seriously damaged, but serious mechanical damage can be caused to a prime motor, so the rest energy is consumed through a daily power supply through chopping, and partial energy waste can be caused.
In this embodiment, as shown in fig. 2, the bidirectional chopper module is connected to the dc networking system, and the bidirectional chopper can be switched between two modes, i.e., boost-up mode and buck-down mode, so as to realize bidirectional flow of energy. The bidirectional chopping module of the direct-current bus system is used for bidirectional flowing of electric energy, the lithium battery pack and the direct-current bus equivalent capacitor can store surplus energy generated by braking, and system voltage is stabilized through charging and discharging when ships are in different working conditions, and power distribution and coordination control of the whole power grid system are achieved.
As an optional implementation, the first preset value is set according to the daily load power consumption.
In this embodiment, the propulsion motor brakes, the power input by the dc bus increases, and when the power increased by the propulsion motor exceeds the daily load power consumption, i.e. the first preset value, the exceeding part reduces the power output by the lithium battery, or a part of the lithium battery is switched from a discharge state to a charge state for energy absorption, so that the power synthesis in the dc bus is consistent with the state before the propulsion motor brakes. The energy flow consumed by the domestic load is shown in figure 3.
As an optional implementation, further comprising:
and if the voltage of the direct current bus exceeds a second preset value and the lithium battery pack meets the charging condition, controlling the lithium battery pack to be converted from the power supply state to the charging state.
In this embodiment, the second preset value is greater than the first preset value. In a pure battery propulsion mode, when a propulsion motor is suddenly braked, if the braking energy is too large, the propulsion motor feeds back the energy of the inverter module, a small part of the energy can be used by daily loads, and the residual energy can directly charge the battery through the chopper module, so that the energy reutilization is realized, and the battery endurance can be increased. In particular embodiments, power allocation may be performed on a customized basis, such as when the bus voltage is above a second predetermined value and the lithium battery is momentarily turned to charge. The energy feedback flow single line diagram is shown in fig. 4. In a specific embodiment, the number of lithium batteries for the discharge-charge state conversion is correspondingly set according to the voltage range of the direct current bus.
As an optional implementation, further comprising:
when the voltage of the direct current bus is lower than the daily load required value, the bidirectional chopping module is in a boosting mode, and the redundant energy is output to the direct current bus through the bidirectional chopping module;
when the voltage of the direct-current bus is higher than the daily load required value, the bidirectional chopping module is in a voltage reduction mode, and the redundant energy is input into the energy storage unit through the bidirectional chopping module.
As an optional implementation, further comprising:
when the lithium battery pack triggers a charging condition, a control module of the lithium battery pack sends a charging signal to a superior control module;
the upper control module starts a standby generator set;
the standby generator set is connected to the direct-current bus, supplies power to the daily load and charges the lithium battery pack.
In the present embodiment, the charge signal is actively sent to the upper control module according to the state of charge of the lithium battery, and the discharge state is switched to the charge state.
As an optional implementation, further comprising:
and the power transfer between the lithium battery pack and the standby generator set is realized through the power distribution and droop curve.
In this embodiment, after one lithium battery pack receives the power transfer command, the power that one lithium battery pack itself undertakes needs to be transferred to another generator set to undertake, but the system load is not changed, the total power of the system should be kept unchanged, and the system should not fluctuate greatly, that is, the dc bus voltage should be finally unchanged theoretically. Power transfer is accomplished using the droop curve logic. The central processing unit moves up a droop curve corresponding to an execution module of the generator set needing to bear surplus power, meanwhile, droop curve mirror image descending of the execution module bearing the power lithium battery pack is reduced, the descending amplitude is equal to the ascending amplitude, after the logic change of the droop curve of each module, each execution module executes a power control function, the process is continuous micro dynamic adjustment, and system fluctuation is small.
As an alternative embodiment, the backup generator set comprises: any one or more of a lithium battery pack, a diesel engine and a shaft motor.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. An energy recovery control method based on a gasoline-electric dual-drive ship is characterized by comprising the following steps:
setting an electric quantity threshold according to daily load power consumption of a ship power system;
if the residual electric quantity of the lithium battery pack is lower than the electric quantity threshold value, starting a standby generator set to supply power to a direct current bus of the ship power system;
and utilizing the standby generator set to output energy exceeding the power consumption part of the daily load to charge the lithium battery pack.
2. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 1, wherein the electric quantity threshold is set to 20% of the full electric quantity of the lithium battery pack.
3. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 1, further comprising:
when the ship is emergently braked, the energy flows back to the direct current bus system;
and recovering overflow energy through a power control system and charging the lithium battery pack.
4. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 3, further comprising:
under the pure battery propulsion mode, if the propulsion motor suddenly brakes and the braking energy exceeds a first preset value, feeding the braking energy back to the inverter module and the chopper module; supplying power to the domestic load through the inverter module; and charging the lithium battery pack through the chopping module.
5. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 4, wherein the first preset value is set according to the daily load power consumption.
6. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 1, further comprising:
and if the voltage of the direct current bus exceeds a second preset value and the lithium battery pack meets the charging condition, controlling the lithium battery pack to be converted from a power supply state to a charging state.
7. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 1, further comprising:
when the voltage of the direct-current bus is lower than a daily load required value, the bidirectional chopping module is in a boosting mode, and the redundant energy is output to the direct-current bus through the bidirectional chopping module;
when the voltage of the direct current bus is higher than the daily load required value, the bidirectional chopping module is in a voltage reduction mode, and redundant energy is input into the energy storage unit through the bidirectional chopping module.
8. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 6, further comprising:
when the lithium battery pack triggers the charging condition, a control module of the lithium battery pack sends a charging signal to a superior control module;
the upper control module starts a standby generator set;
and the standby generator set is connected to the direct-current bus, supplies power to the daily load and charges the lithium battery pack.
9. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 8, further comprising:
and realizing power transfer between the lithium battery pack and the standby generator set through a power distribution and droop curve.
10. The energy recovery control method based on the oil-electric-dual-drive ship according to claim 1, wherein the standby generator set comprises: any one or more of a lithium battery pack, a diesel engine and a shaft motor.
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| CN202211669638.5A CN115864548A (en) | 2022-12-25 | 2022-12-25 | Energy recovery control method based on oil-electricity dual-drive ship |
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| CN202211669638.5A CN115864548A (en) | 2022-12-25 | 2022-12-25 | Energy recovery control method based on oil-electricity dual-drive ship |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117895708A (en) * | 2024-03-18 | 2024-04-16 | 中船赛思亿(无锡)电气科技有限公司 | Ship shaft belt power generation system and method |
| CN117895708B (en) * | 2024-03-18 | 2024-05-14 | 中船赛思亿(无锡)电气科技有限公司 | Ship shaft belt power generation system and method |
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2022
- 2022-12-25 CN CN202211669638.5A patent/CN115864548A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117895708A (en) * | 2024-03-18 | 2024-04-16 | 中船赛思亿(无锡)电气科技有限公司 | Ship shaft belt power generation system and method |
| CN117895708B (en) * | 2024-03-18 | 2024-05-14 | 中船赛思亿(无锡)电气科技有限公司 | Ship shaft belt power generation system and method |
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Country or region after: China Address after: Plot 83-D, Development Zone, Xinwu District, Wuxi City, Jiangsu Province, 214000 Applicant after: China Shipbuilding Saisiyi (Wuxi) Electrical Technology Co.,Ltd. Applicant after: JIANGSU ZHENJIANG SHIPYARD (Group) Co.,Ltd. Address before: Plot 83-D, Development Zone, Xinwu District, Wuxi City, Jiangsu Province, 214000 Applicant before: WUXI SILENT ELECTRIC SYSTEM (SES) TECHNOLOGY Co.,Ltd. Country or region before: China Applicant before: JIANGSU ZHENJIANG SHIPYARD (Group) Co.,Ltd. |