CN114771796A - Ship gas-electric hybrid power system with direct-current networking - Google Patents
Ship gas-electric hybrid power system with direct-current networking Download PDFInfo
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- CN114771796A CN114771796A CN202210196400.9A CN202210196400A CN114771796A CN 114771796 A CN114771796 A CN 114771796A CN 202210196400 A CN202210196400 A CN 202210196400A CN 114771796 A CN114771796 A CN 114771796A
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- 230000006855 networking Effects 0.000 title claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 174
- 239000003345 natural gas Substances 0.000 claims abstract description 86
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 31
- 238000004146 energy storage Methods 0.000 claims abstract description 26
- 238000010248 power generation Methods 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 28
- 239000006200 vaporizer Substances 0.000 claims description 25
- 238000002955 isolation Methods 0.000 claims description 18
- 239000003949 liquefied natural gas Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 6
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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
- B63H21/20—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
Abstract
The invention discloses a ship gas-electric hybrid power system with a direct-current network. The system comprises a natural gas storage tank, a natural gas engine, a gear box, a permanent magnet motor, a direct current bus, an energy storage converter and a lithium iron phosphate battery, wherein the natural gas engine is used as a mechanical power system and is combined with an electric power system, and the problems of insufficient engine power and short endurance mileage are solved. On one hand, the permanent magnet motor with multiple modes is adopted, the number of the motors is saved, a power system is simplified, on the other hand, the direct current networking system can better rectify the current of the power system, and the efficiency of the power system is improved. The invention can be widely applied to the technical field of new energy.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a ship gas-electricity hybrid power system with a direct-current network.
Background
At present, natural gas gradually replaces diesel oil to be called as fuel of a ship engine, and although the natural gas engine has the advantages of high economic benefit, good social benefit and the like, the natural gas engine also has the defects of low energy density, incapability of optimizing the performance of the engine under the working condition of low-power requirement of a ship and the like.
In summary, there is a need to solve the problems in the related art.
Disclosure of Invention
In order to solve the above technical problems, the present invention aims to: the ship gas-electric hybrid power system with the direct-current network is provided.
The technical scheme adopted by the invention is as follows:
the utility model provides a take boats and ships gas-electricity hybrid power system of direct current network deployment, its characterized in that, includes natural gas storage jar, natural gas engine, gear box, permanent-magnet machine, direct current bus, energy storage converter, lithium iron phosphate battery, wherein, the input of natural gas engine with natural gas storage jar is connected, the output of natural gas engine through first clutch with the gear box is connected, the first output of gear box through the second clutch with permanent-magnet machine connects, permanent-magnet machine with direct current bus connects, direct current bus with the lithium iron phosphate battery is connected.
Further, the system further comprises a mains supply, an output end of the mains supply is connected with the direct current bus through a rectifier, and the mains supply is used for charging the lithium iron phosphate battery.
Further, the system further comprises an isolation transformer, the rectifier is connected with the isolation transformer, and the isolation transformer is connected with the mains supply.
Further, the system further comprises an energy storage converter, the direct current bus is connected with the energy storage converter, and the energy storage converter is connected with the lithium iron phosphate battery.
Further, the system also comprises a dynamometer, and the dynamometer is connected with the second output end of the gearbox through a third clutch.
Further, the system also comprises a power generation driver, wherein the direct current bus is connected with the power generation driver, and the power generation driver is connected with the permanent magnet motor.
Further, the system also comprises a vaporizer, wherein the input end of the vaporizer is connected with the natural gas storage tank, the output end of the vaporizer is connected with the input end of the natural gas engine, and the vaporizer is used for vaporizing the liquefied natural gas.
Further, the system further comprises a lower computer, the lower computer is connected with the natural gas engine, the lower computer is connected with the first clutch, the lower computer is connected with the second clutch, the lower computer is connected with the third clutch, the lower computer is connected with the power generation driver, the lower computer is connected with the energy storage converter, and the lower computer is connected with the rectifier.
Further, the system further comprises an upper computer, wherein the upper computer is connected with the lower computer, and the upper computer is connected with the dynamometer.
Further, the system still includes tail gas absorbing device, tail gas absorbing device sets up natural gas engine's exhaust gas outlet department, tail gas absorbing device is used for handling tail gas.
The beneficial effects of the invention are: the utility model provides a take boats and ships gas electricity hybrid power system of direct current network deployment, includes natural gas storage jar, natural gas engine, gear box, permanent-magnet machine, direct current generating line, energy storage converter, lithium iron phosphate battery, combines with commercial power source and the lithium iron phosphate battery as electric power system as mechanical power system through the natural gas engine, obtains hybrid power system, has solved the problem that engine power is not enough, and the mileage of continuing a journey is short. On one hand, the permanent magnet motor with multiple modes is adopted, the number of the motors is saved, a power system is simplified, on the other hand, the direct current networking system can better rectify the current of the power system, and the efficiency of the power system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present invention or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a connection schematic diagram of a ship gas-electric hybrid power system with a direct-current network according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the embodiments of the present invention, several means are one or more, a plurality of means is two or more, more than, less than, more than, etc. are understood as excluding the essential numbers, more than, less than, inner, etc. are understood as including the essential numbers, "at least one" means one or more, "at least one of the following" and the like, and any combination of these items, including any combination of a single item or plural items, is meant. If any description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of the technical features indicated or to implicitly indicate the precedence of the technical features indicated.
It should be noted that terms such as setting, installing, connecting and the like in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine specific meanings of the terms in the embodiments of the present invention by combining specific contents of the technical solutions. For example, the term "coupled" may be mechanical, electrical, or may be in communication with each other; may be directly connected or indirectly connected through an intermediate.
In the description of embodiments of the present disclosure, reference to the description of the terms "one embodiment/implementation," "another embodiment/implementation," or "certain embodiments/implementations," "in the above embodiments/implementations," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least two embodiments or implementations of the present disclosure. In the present disclosure, a schematic representation of the above terms does not necessarily refer to the same exemplary embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.
It should be noted that the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
At present, natural gas gradually replaces diesel oil to be called as fuel of a ship engine, and the natural gas engine has the advantages of high economic benefit, good social benefit and the like. When the equivalent calorific value is the same, the price of the natural gas is only half of that of the diesel oil, and meanwhile, the natural gas is fully combusted and is not easy to deposit carbon, so that the abrasion of parts in an engine cylinder is reduced, the service life of the engine is prolonged, and the economy of the ship is improved. The marine engine is gaseous natural gas, the main component of the marine engine is methane, the marine engine basically has no emission of particulate matters after combustion, and the emission of HC and CO is greatly reduced. However, the natural gas engine also has the defects of low energy density, incapability of optimizing the engine performance under the working condition of low-power requirement of the ship and the like.
The pure electric ship has the advantages of zero pollution, high efficiency, low noise, low operation cost and the like as a hotspot field of current research. However, due to the limitation of the energy storage system, the pure electric ship has the defect of poor cruising ability. At present, pure electric ships are mainly concentrated on small and medium-sized ships such as passenger ships, cruise ships and the like.
For this, this application has provided a take boats and ships gas electricity hybrid power system of direct current network deployment, including natural gas storage jar 1, natural gas engine 4, gear box 6, permanent-magnet machine 8, direct current bus 10, energy storage converter 11, lithium iron phosphate battery 12, wherein, natural gas engine 4's input with natural gas storage jar 1 is connected, natural gas engine 4's output through first clutch 5a with gear box 6 is connected, gear box 6's first output pass through second clutch 5b with permanent-magnet machine 8 connects, permanent-magnet machine 8 with direct current bus 10 is connected, direct current bus 10 with lithium iron phosphate battery 12 connects.
In the embodiment, the natural gas engine is used as a mechanical power system and is combined with a mains supply and a lithium iron phosphate battery which are used as an electric power system to obtain a hybrid power system, so that the problems of insufficient engine power and short endurance mileage are solved. On one hand, the permanent magnet motor with multiple modes is adopted, the number of the motors is saved, a power system is simplified, on the other hand, the direct current networking system can better rectify the current of the power system, and the efficiency of the power system is improved.
Referring to fig. 1, as a further optional implementation, the power system further includes a mains supply, an output end of the mains supply is connected to the dc bus through a rectifier, and the mains supply is configured to charge the lithium iron phosphate battery.
Specifically, the mains supply 15 is connected to the dc bus 10 via the rectifier 13, and the permanent magnet motor 8 can be charged by the mains supply 15.
The mains supply, i.e. the mains frequency Alternating Current (AC), is characterized by three commonly used quantities of alternating current: voltage, current, frequency. The power frequency of the common alternating current in all countries of the world is 50Hz (Hertz) and 60Hz (Hertz), and the distribution of the civil alternating current voltage is different from 100V to 380V. The machine room generally introduces three-phase 380V, 50HZ mains supply as power supply, but the power supply rectification module of the equipment uses single-phase 220V voltage.
Referring to fig. 1, as a further alternative embodiment, the power system further includes an isolation transformer, the rectifier is connected to the isolation transformer, and the isolation transformer is connected to the commercial power source.
In particular, an isolation transformer 14 is provided between the mains supply 15 and the rectifier 13. By arranging the isolation transformer 14, gas-electric isolation can be established between the mains supply 15 and the rectifier 13, so that the power system is protected, and the safety and the stability of the power system are improved.
The isolation transformer is a transformer with an input winding and an output winding electrically isolated, the isolation transformer is used for avoiding touching an electrified body accidentally, and the isolation of the transformer is used for isolating respective currents of primary and secondary winding coils. In the early days, the power supply is used in the electric power industry in European countries and is widely used for control power supplies, safety lighting and indicator lamps of general circuits in electronic industries or industrial and mining enterprises, machine tools and mechanical equipment.
Referring to fig. 1, as a further alternative embodiment, the power system further includes an energy storage converter, the dc bus is connected to the energy storage converter, and the energy storage converter is connected to the lithium iron phosphate battery.
Specifically, lithium iron phosphate battery 12 is connected with direct current bus 10 through energy storage converter 8, and energy storage converter 11 can be on the one hand with the electric energy transmission to direct current bus 10 in lithium iron phosphate battery 12 to satisfy other consumer's power supply demand, on the other hand can be through the electric energy that acquires in direct current bus 10, charge for lithium iron phosphate battery 12, realize the bidirectional transfer of energy between lithium iron phosphate battery 12 and direct current bus 10.
The energy storage converter (Power Conversion System) can control the charging and discharging process of the storage battery, carry out alternating current-direct current Conversion, and can directly supply Power for alternating current loads under the condition of no Power grid. The PCS is composed of a DC/AC energy storage converter, a control unit and the like. The PCS controller receives a background control instruction through communication, and controls the converter to charge or discharge the battery according to the symbol and the size of the power instruction, so that the active power and the reactive power of the power grid are adjusted. The PCS controller is communicated with the BMS through the CAN interface to acquire the state information of the battery pack, so that the protective charging and discharging of the battery CAN be realized, and the running safety of the battery is ensured.
Referring to fig. 1, as a further alternative embodiment, the power system further comprises a dynamometer 7, which is connected with the second output of the gearbox through a third clutch.
Specifically, the dynamometer 7 is connected to the gearbox 6 through the third clutch 5c, and is used as a loading device of the gearbox to test the transmitted power, so as to ensure the normal operation of the power system.
The dynamometer is also called a dynamometer and is mainly used for testing the power of an engine, and can also be used as loading equipment of a gear box, a speed reducer and a gearbox and used for testing the transmission power of the gear box, the speed reducer and the gearbox. Mainly comprises a hydraulic dynamometer, an electric eddy current dynamometer and an electric dynamometer. The electric dynamometer is a device which measures the torque output on various power machine shafts by using a motor and combines the rotating speed to determine the power. Since the power machines being measured may have different rotational speeds, the motors used as electric dynamometers must be motors that can be smoothly regulated. Direct current dynamometers, alternating current dynamometers and eddy current dynamometers are used more.
Referring to fig. 1, as a further alternative embodiment, the power system further includes a power generation driver, the dc bus is connected to the power generation driver, and the power generation driver is connected to the permanent magnet motor.
Specifically, the permanent magnet motor 8 is connected with the direct current bus 10 through the power generation driver 9, and the power generation driver 9 can transmit energy in networking to the permanent magnet motor 8 and also can transmit energy generated by power generation of the permanent magnet motor 8 to a networking system.
Referring to fig. 1, as a further alternative embodiment, the power system further includes a vaporizer, an input of the vaporizer is connected to the natural gas storage tank, an output of the vaporizer is connected to an input of the natural gas engine, and the vaporizer is configured to vaporize the liquefied natural gas.
Specifically, a vaporizer 3 is provided at the natural gas storage tank 1, and when the natural gas engine 1 needs to use natural gas, a check valve 2 provided at the output end of the natural gas storage tank 17 is controlled to be opened, and liquefied natural gas is vaporized by the vaporizer 3. If liquefied natural gas is directly used as fuel, the temperature is too low to operate the system properly.
A vaporizer is a device that heats a liquid until it vaporizes (becomes a gas). In brief, the liquid gas that is cold passes through the vaporizer and then becomes gaseous. The heating may be indirect (steam heated vaporizer, hot water bath vaporizer, natural draft air bath vaporizer, forced draft vaporizer, electrically heated vaporizer, solid heat conducting vaporizer or heat transfer fluid) or direct (hot gas or submerged combustion). Generally, natural gas is prepared as liquefied natural gas for convenient storage and use. The liquefied natural gas is liquid after being compressed and cooled to the condensation point (-161.5 ℃), and is usually stored in a low-temperature storage tank at-161.5 ℃ and about 0.1 MPa. Thus, it is re-vaporized when used.
Referring to fig. 1, as an optional embodiment, the power system further includes a lower computer, the lower computer is connected to the natural gas engine, the lower computer is connected to the first clutch, the lower computer is connected to the second clutch, the lower computer is connected to the third clutch, the lower computer is connected to the power generation driver, the lower computer is connected to the energy storage converter, and the lower computer is connected to the rectifier.
Specifically, the natural gas engine 1, the first clutch 5a, the second clutch 5b, the third clutch 5c, the power generation driver 9, the energy storage converter 11, and the rectifier 13 are all connected to the lower machine 16. The lower computer 16 can directly acquire device information, the acquired information includes actual output/absorption power of the lithium iron phosphate battery pack 12 and the mains supply 15, an SOC value of the lithium iron phosphate battery pack 12, an actual rotating speed and an actual torque of the permanent magnet motor 8, an accelerator opening degree of the natural gas engine 4, an actual rotating speed and an actual torque, and clutch states of the clutches 5a, 5b and 5c, and meanwhile the lower computer 16 transmits the signals to the upper computer 17 to execute corresponding control strategies.
Referring to fig. 1, as a further optional implementation manner, the power system further includes an upper computer, the upper computer is connected with the lower computer, and the upper computer is connected with the dynamometer.
The upper computer 17 is internally provided with an energy management control strategy to perform target power distribution of the natural gas engine 4 and the permanent magnet motor 8 according to requirements and the current operation state, wherein the energy management control strategy comprises a control strategy based on a deterministic rule, a control strategy based on a fuzzy rule, a control strategy based on real-time optimization, a control strategy based on global optimization and the like. The communication protocol of the system can select a common DP protocol, and the upper computer 17 can distribute the actual power of the natural gas engine 4 and the permanent magnet motor 8 according to the actual requirement, wherein the algorithm in the upper computer is not specifically limited. Specifically, the upper computer 17 can distribute power according to the built-in energy management control strategy according to the requirement and the current running state, and meanwhile, technicians can directly control the actual power of the natural gas engine 4 and the permanent magnet motor 8 through the upper computer 17.
Referring to fig. 1, as a further alternative embodiment, the power system further includes a tail gas absorption device disposed at an exhaust gas outlet of the natural gas engine, and the tail gas absorption device is configured to treat tail gas.
Specifically, the exhaust gas treatment device is disposed at an exhaust gas outlet (not shown) of the natural gas engine, and purifies the exhaust gas generated by the natural gas engine 1. The exhaust gas treatment device purifies exhaust gas under the action of a catalyst to reduce environmental pollution. When high-temperature exhaust gas flows through a carrier coated with a catalyst made of a noble metal material, harmful substances (including CO, HC odor and DPM black smoke) in the exhaust gas are chemically reacted under the action of the catalyst and temperature, and are converted into non-toxic H2O and CO 2.
Toxic and harmful substances and smoke dust in the waste gas can be removed by arranging the tail gas treatment device at the waste gas outlet, so that the waste gas is discharged after being treated and the atmospheric pollution is reduced.
The ship gas-electric hybrid power system can realize 4 propulsion modes, and the working principle of the 4 propulsion modes is described below with reference to the attached drawings.
The first mode is a pure electric propulsion mode, in this propulsion mode, the first clutch 5a between the natural gas engine 4 and the gearbox 6 is in a disengaged state, the second clutch 5b between the permanent magnet motor 8 and the gearbox 6, and the clutch 5c between the dynamometer 7 and the gearbox 6 are in an engaged state, the permanent magnet motor 8 is in a motor mode, and the energy required by the permanent magnet motor can be provided by the lithium iron phosphate battery pack 12 through the energy storage converter 11, the direct current bus 10 and the power generation driver 9, or can be provided by the commercial power supply 15 through the isolation transformer 14, the rectifier 13, the direct current bus 10 and the power generation driver, or can be provided by both the two. The lower computer 16 collects the actual rotating speed and the actual power of the permanent magnet motor 8, the SOC value of the lithium iron phosphate battery pack 12 and the clutch states of the second clutches 5b and 5c as monitoring, and simultaneously conveys the actual rotating speed and the actual power value of the permanent magnet motor 8 and the SOC value of the lithium iron phosphate battery pack 12 to the upper computer, the upper computer 17 determines the target rotating speed and the target torque of the permanent magnet motor 8 according to the actual running state and the current working condition power requirement of the system and conveys the lower computer 16, the lower computer 16 transmits the target value to the power generation driver 9, and the power generation driver 9 carries out frequency conversion adjustment on the permanent magnet motor 8 so as to reach the target value.
The second mode is a purely mechanical propulsion mode in which the second clutch 5b between the permanent magnet motor 8 and the gearbox 6 is in a disengaged state and the clutch 5a between the natural gas engine 4 and the gearbox 6 and the third clutch 5c between the dynamometer 7 and the gearbox 6 are in an engaged state. The one-way valve 2 is opened, the liquefied natural gas in the natural gas storage tank 1 is vaporized by the vaporizer 3 and then is delivered to the natural gas engine 4, and the natural gas engine 4 operates. The lower computer 16 collects the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4 and the clutch state of the clutches 5a and 5c as monitoring, meanwhile, the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4 are transmitted to the upper computer 17, the upper computer 17 determines the target rotating speed and the target torque of the engine to be transmitted to the lower computer 16 according to the actual running state of the system and the power requirement of the current working condition, the lower computer 16 transmits the target value to an electronic control unit ECU of the natural gas engine 4, and the target value is adjusted by the electronic control unit ECU to reach the target value.
The third mode is a mechanical propulsion assisted charging mode, in which the first clutch 5a between the natural gas engine 4 and the gear box 6, the second clutch 5b between the permanent magnet motor 8 and the gear box 6, and the third clutch 5c between the dynamometer 7 and the gear box 6 are all engaged, and the permanent magnet motor 8 is in the generator mode. The one-way valve 2 is opened, the liquefied natural gas in the natural gas storage tank 1 is vaporized by the vaporizer 3 and then is delivered to the natural gas engine 4, and the natural gas engine 4 operates. The natural gas engine 4 serves as a unique power source, and besides the power requirement of the dynamometer 7 is met, redundant energy is output to the permanent magnet motor 8, the permanent magnet motor 8 in the power generation mode transmits the energy generated by power generation to the direct current bus 10 through the power generation driver 9, the energy transmitted to the direct current bus can be transmitted to the lithium iron phosphate battery 12 through the energy storage converter 11, and the energy can also be transmitted to the commercial power supply 15 through the rectifier 13 and the isolation transformer 14. The lower computer 16 collects the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4, the actual rotating speed and the actual torque of the permanent magnet motor 8, the SOC value of the lithium iron phosphate battery pack 12 and the clutch states of the clutches 5a, 5b and 5c as monitoring, meanwhile, the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4, the actual rotating speed and the actual torque of the permanent magnet motor 8 and the SOC value of the lithium iron phosphate battery pack 12 are transmitted to the upper computer 17, the upper computer 7 determines the target rotating speed and the target torque of the natural gas engine 4 and the target rotating speed and the target torque of the permanent magnet motor 8 according to the actual running state of the system and the power requirement of the current working condition so as to ensure that the dynamic property, the economical efficiency and the emission property of the natural gas engine 4 are optimized, the upper computer 17 transmits the target value to the lower computer 16, and the lower computer 16 transmits the target rotating speed and the target torque of the natural gas engine 4 to an electronic control unit ECU of the natural gas engine 4, the electronic control unit ECU adjusts the target value, the lower computer 16 sends the target rotation speed and the target torque of the permanent magnet motor 8 to the power generation driver 9, and the power generation driver 9 performs frequency conversion adjustment of the permanent magnet motor 8 to the target value.
The fourth mode is a hybrid propulsion mode in which the first clutch 5a between the natural gas engine 4 and the gearbox 6, the second clutch 5b between the permanent magnet machine 8 and the gearbox 6, and the third clutch 5c between the dynamometer 7 and the gearbox 6 are all engaged, and the permanent magnet machine 8 is in motor mode. The one-way valve 2 is opened, the liquefied natural gas in the natural gas storage tank 1 is vaporized by the vaporizer 3 and then is delivered to the natural gas engine 4, and the natural gas engine 4 operates. The natural gas engine 4 and the permanent magnet motor 8 are jointly used as power sources. The energy required by the permanent magnet motor 8 can be provided by a lithium iron phosphate battery pack 12 through an energy storage converter 11, a direct current bus 10 and a power generation driver 9, can also be provided by a mains supply 15 through an isolation transformer 14, a rectifier 13, the direct current bus 10 and the power generation driver, and can also be provided by the two. The lower computer 16 collects the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4, the actual rotating speed and the actual torque of the permanent magnet motor 8, the SOC value of the lithium iron phosphate battery pack 12 and the clutch states of the clutches 5a, 5b and 5c as monitoring, meanwhile, the throttle opening, the actual rotating speed and the actual torque of the natural gas engine 4, the actual rotating speed and the actual torque of the permanent magnet motor 8 and the SOC value of the lithium iron phosphate battery pack 12 are transmitted to the upper computer 17, the upper computer 7 determines the target rotating speed and the target torque of the natural gas engine 4 and the target rotating speed and the target torque of the permanent magnet motor 8 according to the actual running state of the system and the power requirement of the current working condition so as to ensure that the dynamic property, the economical efficiency and the emission property of the natural gas engine 4 are optimized, the upper computer 17 transmits the target value to the lower computer 16, and the lower computer 16 transmits the target rotating speed and the target torque of the natural gas engine 4 to an electronic control unit ECU of the natural gas engine 4, the electronic control unit ECU adjusts the target value, the lower computer 16 sends the target rotation speed and the target torque of the permanent magnet motor 8 to the power generation driver 9, and the power generation driver 9 performs frequency conversion adjustment of the permanent magnet motor 8 to the target value.
It can be understood that, compared with the prior art, the embodiment of the present invention also has the following advantages:
1) according to the ship gas-electric hybrid power system with the direct-current network, the problems of poor dynamic response, high oil consumption and high emission in a low-speed operation interval of a pure mechanical ship power system using a natural gas engine as a unique power source can be solved by combining a mechanical power system and an electric power system, and the problems of short endurance mileage and poor dynamic performance of the pure electric ship power system can also be solved.
2) The invention adopts the permanent magnet motor with various modes, thereby saving the number of the motors and simplifying a power system.
3) The direct current networking system can better rectify the current of the power system, and the efficiency of the power system is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the essential numbers, and greater than, less than, etc. are understood as including the essential numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a take boats and ships gas electricity hybrid power system of direct current network deployment, its characterized in that, including natural gas storage jar, natural gas engine, gear box, permanent-magnet machine, direct current bus, energy storage converter, lithium iron phosphate battery, wherein, the input of natural gas engine with natural gas storage jar is connected, the output of natural gas engine through first clutch with the gear box is connected, the first output of gear box through the second clutch with permanent-magnet machine connects, permanent-magnet machine with direct current bus connects, the direct current bus with the lithium iron phosphate battery is connected.
2. The ship gas-electric hybrid power system with the direct-current networking of claim 1, further comprising a mains supply, wherein an output end of the mains supply is connected with the direct-current bus through a rectifier, and the mains supply is used for charging the lithium iron phosphate battery.
3. The marine gas-electric hybrid power system with the direct-current networking of claim 2, further comprising an isolation transformer, wherein the rectifier is connected with the isolation transformer, and the isolation transformer is connected with the mains supply.
4. The ship gas-electric hybrid power system with the direct-current networking according to claim 1, further comprising an energy storage converter, wherein the direct-current bus is connected with the energy storage converter, and the energy storage converter is connected with the lithium iron phosphate battery.
5. The ship gas-electric hybrid power system with the direct-current networking of claim 1, further comprising a dynamometer, wherein the dynamometer is connected with the second output end of the gearbox through a third clutch.
6. The ship gas-electric hybrid power system with the direct-current networking of claim 1, further comprising a power generation driver, wherein the direct-current bus is connected with the power generation driver, and the power generation driver is connected with the permanent magnet motor.
7. The ship gas-electric hybrid power system with direct-current networking according to claim 1, further comprising a vaporizer, wherein an input end of the vaporizer is connected with the natural gas storage tank, an output end of the vaporizer is connected with an input end of the natural gas engine, and the vaporizer is used for vaporizing liquefied natural gas.
8. The ship gas-electric hybrid power system with the direct-current network is characterized by further comprising a lower computer, wherein the lower computer is connected with the natural gas engine, the lower computer is connected with the first clutch, the lower computer is connected with the second clutch, the lower computer is connected with the third clutch, the lower computer is connected with the power generation driver, the lower computer is connected with the energy storage converter, and the lower computer is connected with the rectifier.
9. The ship gas-electric hybrid power system with the direct-current networking of claim 8, further comprising an upper computer, wherein the upper computer is connected with the lower computer, and the upper computer is connected with the dynamometer.
10. The ship gas-electric hybrid power system with the direct-current network connection according to claim 1, further comprising a tail gas absorption device, wherein the tail gas absorption device is arranged at an exhaust gas outlet of the natural gas engine, and the tail gas absorption device is used for treating tail gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210196400.9A CN114771796A (en) | 2022-03-01 | 2022-03-01 | Ship gas-electric hybrid power system with direct-current networking |
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| CN202210196400.9A CN114771796A (en) | 2022-03-01 | 2022-03-01 | Ship gas-electric hybrid power system with direct-current networking |
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