CN118205696A - Dual-drive tug electric propulsion system and intelligent working mode adjusting method thereof - Google Patents
Dual-drive tug electric propulsion system and intelligent working mode adjusting method thereof Download PDFInfo
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- CN118205696A CN118205696A CN202410303186.1A CN202410303186A CN118205696A CN 118205696 A CN118205696 A CN 118205696A CN 202410303186 A CN202410303186 A CN 202410303186A CN 118205696 A CN118205696 A CN 118205696A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 137
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 137
- 238000007600 charging Methods 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000010277 constant-current charging Methods 0.000 claims description 9
- 238000010280 constant potential charging Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J3/00—Driving of auxiliaries
- B63J3/02—Driving of auxiliaries from propulsion power plant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
- B63H2021/202—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units of hybrid electric type
- B63H2021/205—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units of hybrid electric type the second power unit being of the internal combustion engine type, or the like, e.g. a Diesel engine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
- B63H2021/216—Control means for engine or transmission, specially adapted for use on marine vessels using electric control means
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- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a dual-drive tug electric propulsion system and an intelligent working mode adjusting method thereof, wherein a power module comprises a lithium battery assembly and a standby power-on module, the lithium battery assembly and the standby power-on module are respectively connected with a direct current bus through a power supply execution module, the lithium battery assembly comprises a plurality of lithium battery groups, a load module and a propulsion motor group are respectively connected with the direct current bus through the load execution module, the propulsion motor group and a mechanical driving module are respectively connected with a propeller group, the lithium battery assembly, the power supply execution module and the load execution module are respectively connected with a control module, and a sensor module acquires signals of the mechanical driving module and the propeller group, information between the power module and the power supply execution module and information between the power supply execution module and the direct current bus and transmits the information to the control module. The system has simple configuration and low cost, does not need to additionally arrange a plurality of diesel engine hosts, replaces the diesel engine hosts by the lithium battery pack, and has good environmental protection.
Description
Technical Field
The invention relates to a ship electric propulsion system, in particular to a dual-drive tug electric propulsion system and an intelligent working mode adjusting method thereof.
Background
With the development of the technology of marine battery, the purpose of saving fuel consumption and protecting marine environment is achieved by using a marine oil-electricity hybrid power system based on configuration energy storage. The ship oil-electricity hybrid power system can be quickly adjusted to work, so that the ship oil-electricity hybrid power system can be efficiently judged, the current working mode and state can be accurately judged to be the current necessary conditions, and meanwhile, in some special conditions, for example, mute operation is required, and in areas with sensitive emission and the like, the lithium battery is required to be quickly switched to work.
Chinese patent application number 201220488313.2 discloses a ship hybrid power system, including diesel engine host computer, reduction gear box, axle area motor, generating set, converter, block board and screw, this reduction gear box's input is connected to the output of this diesel engine host computer, and this screw is connected to this reduction gear box's first output, and this axle area motor is connected to the second output, and this block board is connected to this generating set electricity, and this active front end converter is connected to this block board electricity, and this axle area motor is connected to this converter electricity. The utility model discloses a ship hybrid power system, including fuel generating set and motor unit, fuel generating set includes the fuel oil machine, and the fuel oil machine is connected with synchronous generator electricity, synchronous generator's output is connected with the AC/DC converter, and the AC/DC converter inserts the female row of direct current, motor unit includes the charger, power energy storage battery is connected to the output of charger, power energy storage battery's output is connected with two-way DC/DC converter, and the DC/DC converter inserts the female row of direct current, the output of the female row of direct current is connected with two way load module, is adjustable pitch propeller module and daily equipment module respectively. The invention discloses the structural composition of the ship hybrid power system, the working state of the ship oil-electricity hybrid power system can be regulated, but a specific technical scheme and optimization treatment are not given for judging the current working mode and state, and in addition, the invention does not relate to an intelligent regulation method of the working mode of the electric propulsion system.
Under the condition of towing a large ship, the propeller of the engineering operation ship is designed to be a towing force type, when the ship is towed at a low speed, the rotating speed of the propeller of the towing ship reaches a target value, the towing ship can output high thrust outwards at the moment, compared with a sailing mode, the power absorption is changed to some extent, but the capacity of the diesel engine is not changed, and the comprehensive energy utilization efficiency is not high.
Disclosure of Invention
The invention aims to: aiming at the problems, the invention aims to provide a dual-drive tug electric propulsion system which can realize intelligent switching of working modes according to the current working state and improve the comprehensive energy utilization efficiency. And provides an intelligent adjusting method for the working mode.
The technical scheme is as follows: the utility model provides a dual drive tug electric propulsion system, including power module, power supply execution module, direct current bus subassembly, load execution module, load module, mechanical drive module, control module, the sensor module, power module includes lithium battery module, reserve circular telegram module, both are connected with the direct current bus in the direct current bus subassembly through power supply execution module respectively, lithium battery module includes a plurality of lithium cell group, load module passes through load execution module and is connected with the direct current bus, make power module can be through the direct current bus for the load module power supply, load module includes propulsion motor group, mechanical drive module includes host computer drive module, the screw group, host computer drive module, propulsion motor group is connected with screw group power respectively and is formed into dual drive, lithium cell module, power supply execution module, load execution module is connected with control module respectively, the sensor module is used for gathering host computer drive module, between power module and the power supply execution module, information between power supply execution module and the direct current bus and transfer for control module.
The power supply module is used as an electric energy provider and is responsible for providing electric energy for the load module and the propulsion motor group, wherein the energy of the lithium battery group occupies higher energy; when the system is started, the lithium battery pack is used for supplying power preferentially, and when the standby power-on module meets the conditions, the system is started.
Further, the lithium battery assembly further comprises a standby lithium battery pack interface, the standby power-on module comprises a standby generator set and a shore power supply interface, the power supply execution module comprises a chopping assembly and a rectifying assembly, the plurality of lithium battery packs and the standby lithium battery pack interface are respectively connected with the direct current bus through the chopping assembly, the standby generator set and the shore power supply interface are respectively connected with the direct current bus through the rectifying assembly, and the chopping assembly and the rectifying assembly are respectively connected with the control module.
Most preferably, the chopper component is DC/DC and the rectifier component is AC/DC.
Further, the load execution module comprises a plurality of inversion assemblies, the load module further comprises at least one daily electric load, the propulsion motor group comprises at least two propulsion motors, the propulsion motors and the daily electric load are respectively connected with the direct current bus through one inversion assembly, and the inversion assemblies are respectively connected with the control module.
Optimally, the inversion component is DC/AC, and the propulsion motor is a shaft motor.
Optimally, the host driving module comprises a diesel engine host and a gear box, the propeller group at least comprises two propellers, each propeller is respectively provided with a diesel engine host and a propulsion motor, the diesel engine host is respectively connected with a corresponding propeller through a gear box, and the output end of each gear box is respectively connected with the sensor module.
Further, the control module comprises a power control system PMS, a battery pack monitoring system BMS, a main controller and a terminal controller, wherein the power control system PMS is a software system embedded in the main controller, the lithium battery assembly is in signal connection with the battery pack monitoring system BMS, the power supply execution module and the load execution module are respectively in signal connection with the main controller through the terminal controller, and the sensor module is in signal connection with the main controller.
Further, the sensor module comprises a current sensor, a first voltage sensor, a second voltage sensor, an electromagnetic pulse sensor I, an electromagnetic pulse sensor II, a torque sensor I and a torque sensor II which are respectively connected with the control module in a signal mode, a plurality of current sensors and the first voltage sensor I are arranged between the power supply module and the power supply execution module, a plurality of voltage sensors II are arranged between the power supply execution module and the direct-current bus, the electromagnetic pulse sensor I and the torque sensor I are respectively arranged on the propeller group, and the electromagnetic pulse sensor II and the torque sensor II are respectively arranged on the mechanical driving module.
The intelligent working mode adjusting method of the double-drive tug electric propulsion system comprises the following steps of:
Step one: setting parameters;
Setting the electric quantity of the lithium battery pack as Q 100％ when the electric quantity of the lithium battery pack is full; the electric quantity when the current electric quantity Q of the lithium battery pack is 20 percent is Q 20％, and the current electric quantity Q is used as a lower limit threshold for keeping the endurance; the electric quantity when the current electric quantity Q of the lithium battery pack is 50% is the electric quantity Q 50％, and the electric quantity is used as a lithium battery charging mode conversion threshold; the rated power of the mechanical driving module is P 2L when the mechanical driving module operates at a low speed, and the rated power of the mechanical driving module is P 2H when the mechanical driving module operates at a high speed;
Step two: detecting parameters;
s21: detecting the current electric quantity Q of the lithium battery pack;
the control module acquires circuit parameter information through the sensor module, obtains the current electric quantity Q of the lithium battery packs through operation, and records the electric quantity of each lithium battery pack as Q 1,...,Qn;
S22: detecting the power P 1 of the propeller group during operation;
the control module collects the rotating speed n 1 and the torque T 1 of the propeller group through the sensor module, and the rotating speed is calculated according to the formula Obtaining the power P 1 of the propeller group during working;
S23: detecting the operation power P 2 of the mechanical driving module;
The control module collects the rotating speed n 2 and the torque T 2 of the mechanical driving module through the sensor module, and the rotating speed is calculated according to the formula Obtaining the power P 2 of the diesel engine main engine when in operation;
S24: detecting the working power P b of the lithium battery pack;
The control module detects the voltage U of each lithium battery in the lithium battery pack through the sensor module, namely the voltage of each lithium battery is U 1,U2; measuring the current I of each lithium battery in the lithium battery pack through a plurality of current sensors, namely the electric quantity of each lithium battery is I 1,I2; the power P b1,Pb2 of each lithium battery is available according to the formula p=ui;
step three: judging whether the work is finished;
s31: if the ship continues to run and voyage, entering a step four;
s32: if the ship does not continue sailing, ending the working flow;
step four: judging the current working mode;
S41: when q=q 100％ and P 2 =0, enter mode one S 1, if P b1+Pb2＞P1, enter step five;
S42: if P b1+Pb2＜P1 is the same, the mechanical driving module enters a low gear and returns to the step two;
S43: when Q is less than or equal to Q 100％ and 0 is less than P 2≤P2L, entering a mode two S 2, and if P 1＜P2L, entering a step six;
S44: if P b1+Pb2+P2＞P1 is P 1＞P2, go to step five;
s45: if P b1+Pb2+P2＜P1 is the same, the mechanical driving module enters a high-speed gear and returns to the step two;
s46: when Q is less than or equal to Q 100％ and P 2≥P2H, entering a mode III S 3, and if P 2L＜P1＜P2H, entering a step six;
S47: if P 1＞P2H is the same, step five is entered;
step five: discharging the lithium battery pack;
Opening a switch of the lithium battery pack and the direct current bus, when the electric quantity Q of the lithium battery pack is smaller than Q L, opening the switch, and returning to the second step;
step six: charging a lithium battery pack;
s61: opening a switch of the lithium battery pack and the direct current bus, and performing constant-voltage constant-current charging on the lithium battery pack;
S62: if the current electric quantity Q is smaller than Q 50％, the charging mode of the lithium battery pack is changed into constant-current charging, and the redundant power generated by the mechanical driving module during working is converted into constant-current charging through the power supply executing module;
S63: if the current electric quantity Q is larger than Q 50％, the charging mode of the lithium battery pack is changed into constant voltage charging, redundant power generated by the mechanical driving module during working is converted into constant voltage charging through the power supply executing module, and when Q=Q 100％, the switch for opening the lithium battery pack and the direct current bus is disconnected, and the step two is returned.
The beneficial effects are that: compared with the prior art, the invention has the advantages that:
1. The invention provides a dual-drive tug electric propulsion system which is simple in system configuration and low in cost. The lithium battery pack is used for replacing a plurality of diesel engine hosts, so that the environment friendliness is good.
Under the control of the DC/AC of the inversion assembly, the propulsion motor can be converted into multiple modes, wherein the propulsion motor is used as a pure electric motor to operate, and the propulsion motor is used as a generator to coordinate the diesel generator host to better meet the ship operation requirements under multiple working conditions.
2. The resource is saved, the redundant energy generated by the work of the diesel engine main engine is not wasted, the lithium battery pack is used for storing the energy, and meanwhile, the circuit can be protected, and the circuit short circuit caused by current overload is avoided; at this time, the generating capacity of the propulsion motor is fully automatically controlled by a power control system (PMS), the PMS collects a rotating speed signal, a main engine accelerator scale signal and a propulsion motor signal to control the generating capacity, and in order to ensure the safety of the main engine, the PMS can automatically limit the generating rotating speed (the idle speed and the low speed of the main engine do not generate electricity) and the generating power to ensure the stable operation of the system.
3.3 Different working modes are defined, an intelligent adjusting method is developed, and the power system can meet the working requirements and the performance protection of a diesel engine main engine under different working modes.
4. The dual redundancy communication mode between the terminal controller and the main controller is provided, namely, before the terminal controller gives control instructions to the respective execution modules, the necessary logic processing can be carried out on the main controller commands, the safe and smooth transmission of the instructions is ensured, and the reliability of the system operation is provided.
Drawings
FIG. 1 is a control schematic diagram of the present invention;
FIG. 2 is a graph of power versus a diesel engine host and propeller;
FIG. 3 is a graph of the discharge energy of a lithium battery pack;
Fig. 4 is a charge energy diagram of a lithium battery pack;
Fig. 5 is a flow chart of intelligent regulation for different modes of operation.
Detailed Description
The invention will be further elucidated with reference to the drawings and to specific embodiments, it being understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope thereof.
The electric propulsion system of the double-drive tug comprises a power module 100, a power supply execution module 200, a direct current bus assembly 300, a load execution module 400, a load module 500, a mechanical drive module 600, a control module 700 and a sensor module as shown in fig. 1-4.
The power module 100 comprises a lithium battery assembly and a standby power-on module, the lithium battery assembly comprises a lithium battery pack 101 and a standby lithium battery pack interface 102, the standby power-on module comprises a standby power generator set 103 and a shore power supply interface 104, the lithium battery pack 101 can be configured in a plurality according to the requirement, the same number of standby lithium battery pack interfaces 102 also need to be configured, the power supply execution module 200 comprises a chopper assembly 201 and a rectifier assembly 202, the plurality of lithium battery packs 101 and the plurality of standby lithium battery pack interfaces 102 are respectively connected with a direct current bus 301 through the chopper assembly 201, the standby power generator set 103 and the shore power supply interface 104 are respectively connected with the direct current bus 301 of the direct current bus assembly 300 through the rectifier assembly 202, the chopper assembly 201 is DC/DC, the rectifier assembly 202 is AC/DC, and the standby lithium battery pack interface 102 is used for adding the lithium battery pack 101.
The power module 100 is used as an electric energy provider and is responsible for providing electric energy for the load module 500 and the propulsion motor set, wherein the energy of the lithium battery pack 101 occupies relatively high energy; the lithium battery pack 101 is used for supplying power preferentially when the system is started, and the standby generator set 103 is started when the conditions are met.
The load performing module 400 includes a plurality of inverter assemblies 401, the load module 500 includes a propulsion motor group and at least one daily electrical load 502, the mechanical driving module 600 includes a host driving module, a propeller group, the propulsion motor group includes a propulsion motor 501, the propeller group includes a propeller 603, and the number of the propulsion motors 501 is the same as the number of the configured propellers 603.
The propulsion motor group comprises at least two propulsion motors 501, the propulsion motors 501 and a daily electric load 502 are respectively connected with the direct current bus 301 through an inverter assembly 401, the inverter assembly 401 is DC/AC, and the propulsion motors 501 are shaft motors. The load module 500 and the propulsion motor group are respectively connected with the direct current bus 301 through the load execution module 400, the propulsion motor group and the host driving module are respectively connected with the propeller group, the host driving module comprises a diesel engine host 601 and a gear box 602, the propeller group at least comprises two propellers 603, each propeller 603 is respectively provided with a diesel engine host 601 and a propulsion motor 501, and the diesel engine host 601 is respectively connected with a corresponding propeller 603 through a gear box 602.
The lithium battery assembly, the power supply execution module 200 and the load execution module 400 are respectively connected with the control module 700, and the sensor module collects signals of the host driving module and the propeller group and information between the power supply module 100 and the power supply execution module 200 and between the power supply execution module 200 and the direct current bus 301 and transmits the information to the control module 700. The control module 700 comprises a power control system PMS710, a battery pack monitoring system BMS720, a main controller 730 and a terminal controller 741, wherein the power control system PMS710 is a software system embedded in the main controller 730, and controls the main controller 730 and the terminal controller 741, thereby controlling the whole propulsion system; the lithium battery assembly is equipped with an independent battery pack monitoring system BMS720, is connected with the lithium battery pack 101 and the standby lithium battery pack interface 102 through signal lines, and is responsible for collecting various data of the lithium battery, such as terminal voltage of all lithium battery cells, running current of a lithium battery cluster, temperature of the lithium battery, ambient humidity, fault alarm, maximum allowable charge and discharge current value and SOC value (percentage of residual electric quantity of the lithium battery). The terminal controller 741 is provided with a plurality of chopper assemblies 201, rectifier assemblies 202 and inverter assemblies 401, and the chopper assemblies, rectifier assemblies and inverter assemblies are respectively connected with the main controller 730 through the terminal controller 741 in a signal manner.
The sensor module is in signal connection with the main controller 730. The sensor module includes a current sensor 811, a first voltage sensor 812, a second voltage sensor 812, a first electromagnetic pulse sensor, a second electromagnetic pulse sensor, a first torque sensor, and a second torque sensor.
A current sensor 811 and a first voltage sensor 812 are arranged between the lithium battery pack 101, the standby lithium battery pack interface 102 and the chopper assembly 201, and between the standby generator set 103, the shore power supply interface 104 and the rectifying assembly 202, and a second voltage sensor 813 is arranged between each chopper assembly 201, each rectifying assembly 202 and the direct current bus 301; the current sensor 811, the first voltage sensor 812 and the second voltage sensor 812 are connected with the collector in the main controller 730 through signal lines, so that the main controller 730 can know and calculate the running state of each device through the data of the collector. An electromagnetic pulse sensor I and a torque sensor I are mounted on the propeller shaft of the propeller 603, and an electromagnetic pulse sensor II and a torque sensor II are respectively mounted on the output end of the gear box 602.
Under different working conditions, the propulsion motor is equivalent to a power supply, the lithium battery pack is equivalent to a load, namely, when the propulsion motor is converted into a generator for use, the power supply is equivalent to the power supply, and when the shore power supply interface is connected to charge the lithium battery pack, the lithium battery pack is equivalent to the load.
The dual-drive tug electric propulsion system adopts a dual-drive mode of a diesel engine main engine and a propulsion motor, the power source of the propulsion motor is mainly a lithium battery pack, and meanwhile, the propulsion motor can be converted into multiple modes, wherein the propulsion motor is used as a pure electric motor to operate, and is used as a generator to coordinate a diesel power generation main engine to better meet the operation requirements of ships under multiple working conditions, and the propulsion motor is used for generating or propelling and is controlled by an inversion assembly connected with the propulsion motor.
The propulsion motor is used as a generator, at least one diesel engine of the mechanical driving module is started, the ship power source is only the diesel engine, and meanwhile, the propulsion motor can convert the surplus power of the diesel engine into electric energy to be generated.
As shown in fig. 2, a curve S1 represents an upper limit value of capability of the diesel engine at each rotation speed point, and at the same rotation speed point, the engine power may output any value not higher than the upper limit of the curve S1; the power value absorbed by the equivalent propeller at each rotating speed in the S2-bit sailing mode of the curve; the area A is the power generation capacity of the propulsion motor, the power absorbed by the propeller at each rotating speed is a fixed value, but the diesel engine main engine can output a variable value, and the output power of the diesel engine main engine is recorded as P (S1), the absorption power of the propeller is recorded as P (S2), and the absorption power of the propulsion motor is recorded as P (x), so that different working state models of the propulsion motor are as follows:
p (S1) =p (S2), the host propelling the vessel voyage;
P (S1) =p (S2) +p (x), ship sailing+propulsion motor power generation;
At the moment, the generating capacity of the propulsion motor is fully automatically controlled by the power control system PMS, the power control system PMS controls the generating capacity by collecting the rotating speed signal, the throttle scale signal of the diesel engine main engine and the propulsion motor signal, and meanwhile, the power control system PMS can automatically limit the generating rotating speed (the main engine idle speed and the low speed do not generate electricity) and the generating power, so that the stable operation of the system is ensured.
The chopper component and the rectifier component are responsible for controlling the access of the corresponding power supply and executing different power input and output according to the instruction of the power control system PMS; the direct current bus is used as a current collecting point of energy of the direct current networking system, and all the energy is transmitted, exchanged and distributed on the direct current bus.
The load execution module can be provided with multiple paths of loads according to actual use requirements, each path of load is provided with a corresponding inversion assembly and is connected with a corresponding terminal controller through a cable to control the running state of the load; the load module comprises all loads actually used by the ship, and the propulsion motor is responsible for driving the propeller to propel the ship to sail; diesel engine powered main engines are also used to drive propellers to propel the vessel for voyage.
The main controller can collect external communication data, process and calculate the external communication data, and issue instructions to the terminal controllers; the main controller controls the internal execution mechanism of the direct current networking by taking the sensor in the system and the initial input data of external communication as control starting points. The terminal controller and the main controller adopt a dual redundancy communication mode, so that safe and smooth transmission of the instruction is ensured, and the terminal controller can perform necessary logic processing on the main controller command before issuing the control instruction to each execution module.
The invention sets that:
(1) When the lithium battery pack discharges, the diesel engine main engine is set to be in a mode one S 1 when not working;
(2) When the diesel engine main engine works at a low speed, setting the diesel engine main engine to be in a mode two S 2;
(3) Setting a diesel engine main engine to be in a mode III S 3 when the diesel engine main engine works at a high speed;
As shown in fig. 3, when the system determines that the current mode is mode one S 1; when the lithium battery pack can meet the energy of the propeller during working, the energy controls the operation of the propeller and meets the daily electricity consumption through the chopper assembly, the inverter assembly and the propulsion motor, namely the propulsion motor is in a power supply state;
As shown in fig. 4, when the system determines that the current mode is the mode two S 2 or the mode three S 3, and the energy sent by the diesel engine host can meet the energy requirement of the propeller during working, the redundant energy can charge the lithium battery pack and meet the daily electricity consumption through the propulsion motor, the chopper assembly and the rectifier assembly; the propulsion motor is in a power generation state, mechanical energy is converted into electric energy, the lithium battery pack is charged through the chopping component and the rectifying component, the electric energy is converted into battery chemical energy (electric energy storage), and the conversion from the mechanical energy of the diesel engine host to the electric energy to the chemical energy is realized;
when the system judges that the current mode is the mode two S 2 or the mode three S 3, and the energy sent by the diesel engine main engine can not meet the energy requirement of the propeller during working, the required energy is compensated by the lithium battery pack, and the energy meets the requirements of the propeller on working and daily electricity through the chopping component, the inversion component and the propulsion motor.
As shown in fig. 5, the intelligent adjustment method for the working mode of the dual-drive tug electric propulsion system comprises the following steps:
Step one: setting parameters;
The electric quantity of the lithium battery pack is Q 100％ when the electric quantity is full; the current electric quantity Q of the lithium battery pack is Q 20％ when 20% of the current electric quantity Q is remained, and the current electric quantity Q is used as a lower limit threshold value for keeping endurance so as to ensure the service life of the battery; the electric quantity when the current electric quantity Q of the lithium battery pack is 50% of the electric quantity Q 50％ is used as a conversion threshold value of a lithium battery charging mode (constant-current constant-voltage charging); the diesel engine main engine is set to be P 2L as rated power in low-speed operation and P 2H as rated power in high-speed operation;
Step two: detecting parameters;
s21: detecting the current electric quantity Q of the lithium battery pack;
the circuit parameter information, such as voltage and current values, acquired by the control module is calculated by the main controller to obtain the current electric quantity Q of the lithium battery packs, and the electric quantity of each lithium battery pack is recorded as Q 1,...,Qn;
S22: detecting the power P 1 of the propeller during working;
The control module reads the rotating speed n 1 of the propeller through the electromagnetic pulse sensor I, the torque sensor reads the torque T 1 of the propeller, and the formula is based on Obtaining the power P 1 of the propeller during working;
s23: detecting the running power P 2 of a diesel engine main engine;
The control module reads the rotating speed n 2 of the diesel engine main engine through the electromagnetic pulse sensor II, the torque sensor reads the torque T 2 of the diesel engine main engine, and the formula is based on Obtaining the power P 2 of the diesel engine main engine when in operation;
S24: detecting the working power P b of the lithium battery pack;
the control module senses the voltage U of each lithium battery in the lithium battery pack through a plurality of voltage sensors, namely, the voltage of each lithium battery is U 1,U2; measuring the current I of each lithium battery in the lithium battery pack through a plurality of current sensors, namely the electric quantity of each lithium battery is I 1,I2; the power P b1,Pb2 of each lithium battery is available according to the formula p=ui;
Step three: judging whether the work is finished
S31: if the ship continues to run and voyage, entering a step four;
s32: if the ship does not continue sailing, ending the working flow;
Step four: judging the current working mode
S41: when q=q 100% and P 2 =0, enter mode one S 1, if P b1+Pb2＞P1, enter step five;
s42: if P b1+Pb2＜P1 is the same, the diesel engine main engine enters a low gear and returns to the step two;
S43: when Q is less than or equal to Q 100% and 0 is less than P 2≤P2L, entering a mode two S 2, and if P 1＜P2L, entering a step six;
S44: if P b1+Pb2+P2＞P1 is P 1＞P2, go to step five;
S45: if P b1+Pb2+P2＜P1 is the same, the diesel engine main engine enters a high-speed gear, and the step two is returned;
S46: when Q is less than or equal to Q 100% and P 2≥P2H, entering a mode III S 3, and if P 2L＜P1＜P2H, entering a step six;
S47: if P 1＞P2H is the same, step five is entered;
step five: discharging the lithium battery pack;
Opening a switch of the lithium battery pack and the direct current bus, when the electric quantity Q of the lithium battery pack is smaller than Q L, opening the switch, and returning to the second step;
step six: charging a lithium battery pack;
s61: opening a switch of the lithium battery pack and the direct current bus, and performing constant-voltage constant-current charging on the lithium battery pack;
S62: if the current electric quantity Q is smaller than Q 50％, the charging mode of the lithium battery pack is changed into constant-current charging, and the redundant power generated when the diesel engine main engine works is converted into constant-current charging through the rectifying component;
S63: if the current electric quantity Q is larger than Q 50％, the charging mode of the lithium battery pack is changed into constant voltage charging, and then the redundant power generated when the diesel engine main engine works is converted into constant voltage charging through the chopping component, and when Q=Q 100％, the switch for opening the lithium battery pack and the direct current bus is disconnected, and the second step is returned.
Claims (9)
1. A dual drive tug electric propulsion system, characterized by: the power supply module (100) comprises a lithium battery assembly and a standby power-on module, the lithium battery assembly comprises a plurality of lithium battery packs (101), the load module (500) is connected with the direct current buses (301) through the load execution module (400), the power supply module (100) can supply power to the load module (500) through the direct current buses (301), the load module (500) comprises a propulsion motor unit, the mechanical drive module (600) comprises a host drive module and a propeller unit, the host drive module and the propulsion motor unit are respectively connected with the propeller unit in a power mode to form double drive, the lithium battery assembly, the power execution module (200) and the load execution module (400) are respectively connected with the control module (700), the sensor module is used for collecting signals of the host drive module and the propeller unit and transmitting information between the power supply module (100) and the power supply module (200) and the control module (700) and the power execution module (200).
2. A dual drive tug electric propulsion system as claimed in claim 1 wherein: the lithium battery assembly further comprises a standby lithium battery pack interface (102), the standby power-on module comprises a standby generator set (103) and a shore power supply interface (104), the power supply execution module (200) comprises a chopping assembly (201) and a rectifying assembly (202), the plurality of lithium battery packs (101) and the standby lithium battery pack interface (102) are respectively connected with the direct-current bus (301) through the chopping assembly (201), the standby generator set (103) and the shore power supply interface (104) are respectively connected with the direct-current bus (301) through the rectifying assembly (202), and the chopping assembly (201) and the rectifying assembly (202) are respectively connected with the control module (700).
3. A dual drive tug electric propulsion system as claimed in claim 2 wherein: the chopper component (201) is DC/DC, and the rectifier component (202) is AC/DC.
4. A dual drive tug electric propulsion system as claimed in claim 1 wherein: the load execution module (400) comprises a plurality of inverter components (401), the load module (500) further comprises at least one daily electric load (502), the propulsion motor group comprises at least two propulsion motors (501), the propulsion motors (501) and the daily electric load (502) are respectively connected with the direct current bus (301) through one inverter component (401), and the inverter components (401) are respectively connected with the control module (700).
5. A dual drive tug electric propulsion system as claimed in claim 4 wherein: the inverter assembly (401) is DC/AC, and the propulsion motor (501) is a shaft motor.
6. A dual drive tug electric propulsion system as claimed in claim 4 wherein: the host driving module comprises a diesel engine main engine (601) and a gear box (602), wherein the propeller group at least comprises two propellers (603), each propeller (603) is respectively provided with the diesel engine main engine (601) and a propulsion motor (501), the diesel engine main engine (601) is respectively connected with the corresponding one of the propellers (603) through the gear box (602), and the output end of each gear box (602) is respectively connected with the sensor module.
7. A dual drive tug electric propulsion system as claimed in claim 1 wherein: the control module (700) comprises a power control system PMS (710), a battery pack monitoring system BMS (720), a main controller (730) and a terminal controller (741), wherein the power control system PMS (710) is a software system embedded in the main controller (730), a lithium battery assembly is in signal connection with the battery pack monitoring system BMS (720), the power supply execution module (200) and the load execution module (400) are respectively in signal connection with the main controller (730) through the terminal controller (741), and the sensor module is in signal connection with the main controller (730).
8. A dual drive tug electric propulsion system as claimed in claim 1 wherein: the sensor module comprises a current sensor (811), a first voltage sensor (812), a second voltage sensor (812), a first electromagnetic pulse sensor, a second electromagnetic pulse sensor, a first torque sensor and a second torque sensor which are respectively connected with the control module (700) in a signal mode, a plurality of current sensors (811) and the first voltage sensor (812) are arranged between the power supply module (100) and the power supply execution module (200), a plurality of second voltage sensors (812) are arranged between the power supply execution module (200) and the direct current bus (301), the first electromagnetic pulse sensor and the first torque sensor are respectively arranged on the propeller group, and the second electromagnetic pulse sensor and the second torque sensor are respectively arranged on the mechanical driving module (600).
9. An intelligent regulation method for the operation mode of a dual-drive tug electric propulsion system according to any one of claims 1 to 8, characterized by comprising the following steps:
Step one: setting parameters;
Setting the electric quantity of the lithium battery pack as Q 100％ when the electric quantity of the lithium battery pack is full; the electric quantity when the current electric quantity Q of the lithium battery pack is 20 percent is Q 20％, and the current electric quantity Q is used as a lower limit threshold for keeping the endurance; the electric quantity when the current electric quantity Q of the lithium battery pack is 50% is the electric quantity Q 50％, and the electric quantity is used as a lithium battery charging mode conversion threshold; the rated power of the mechanical driving module is P 2L when the mechanical driving module operates at a low speed, and the rated power of the mechanical driving module is P 2H when the mechanical driving module operates at a high speed;
Step two: detecting parameters;
s21: detecting the current electric quantity Q of the lithium battery pack;
the control module acquires circuit parameter information through the sensor module, obtains the current electric quantity Q of the lithium battery packs through operation, and records the electric quantity of each lithium battery pack as Q 1,...,Qn;
S22: detecting the power P 1 of the propeller group during operation;
the control module collects the rotating speed n 1 and the torque T 1 of the propeller group through the sensor module, and the rotating speed is calculated according to the formula Obtaining the power P 1 of the propeller group during working;
S23: detecting the operation power P 2 of the mechanical driving module;
The control module collects the rotating speed n 2 and the torque T 2 of the mechanical driving module through the sensor module, and the rotating speed is calculated according to the formula Obtaining the power P 2 of the diesel engine main engine when in operation;
S24: detecting the working power P b of the lithium battery pack;
The control module detects the voltage U of each lithium battery in the lithium battery pack through the sensor module, namely the voltage of each lithium battery is U 1,U2; measuring the current I of each lithium battery in the lithium battery pack through a plurality of current sensors, namely the electric quantity of each lithium battery is I 1,I2; the power P b1,Pb2 of each lithium battery is available according to the formula p=ui;
step three: judging whether the work is finished;
s31: if the ship continues to run and voyage, entering a step four;
s32: if the ship does not continue sailing, ending the working flow;
step four: judging the current working mode;
S41: when q=q 100％ and P 2 =0, enter mode one S 1, if P b1+Pb2＞P1, enter step five;
S42: if P b1+Pb2＜P1 is the same, the mechanical driving module enters a low gear and returns to the step two;
S43: when Q is less than or equal to Q 100％ and 0 is less than P 2≤P2L, entering a mode two S 2, and if P 1＜P2L, entering a step six;
S44: if P b1+Pb2+P2＞P1 is P 1＞P2, go to step five;
s45: if P b1+Pb2+P2＜P1 is the same, the mechanical driving module enters a high-speed gear and returns to the step two;
S46: when Q is less than or equal to Q 100% and P 2≥P2H, entering a mode III S 3, and if P 2L＜P1＜P2H, entering a step six;
S47: if P 1＞P2H is the same, step five is entered;
step five: discharging the lithium battery pack;
Opening a switch of the lithium battery pack and the direct current bus, when the electric quantity Q of the lithium battery pack is smaller than Q L, opening the switch, and returning to the second step;
step six: charging a lithium battery pack;
s61: opening a switch of the lithium battery pack and the direct current bus, and performing constant-voltage constant-current charging on the lithium battery pack;
S62: if the current electric quantity Q is smaller than Q 50％, the charging mode of the lithium battery pack is changed into constant-current charging, and the redundant power generated by the mechanical driving module during working is converted into constant-current charging through the power supply executing module;
S63: if the current electric quantity Q is larger than Q 50％, the charging mode of the lithium battery pack is changed into constant voltage charging, redundant power generated by the mechanical driving module during working is converted into constant voltage charging through the power supply executing module, and when Q=Q 100％, the switch for opening the lithium battery pack and the direct current bus is disconnected, and the step two is returned.
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| CN202310867922.1A CN116812127A (en) | 2023-07-14 | 2023-07-14 | Dual-drive tug electric propulsion system and intelligent working mode adjusting method thereof |
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