CN209479942U - A kind of marine electric power propulsion device based on ac-dc-ac frequency converter - Google Patents
A kind of marine electric power propulsion device based on ac-dc-ac frequency converter Download PDFInfo
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- CN209479942U CN209479942U CN201920197089.3U CN201920197089U CN209479942U CN 209479942 U CN209479942 U CN 209479942U CN 201920197089 U CN201920197089 U CN 201920197089U CN 209479942 U CN209479942 U CN 209479942U
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Abstract
The utility model provides a kind of marine electric power propulsion device based on ac-dc-ac frequency converter, includes: prime mover provides the first mechanical energy；Generator connects prime mover, converts the first mechanical energy as the first AC energy；Motor connects generator, converts the first AC energy as the second mechanical energy；Propeller connects motor, drives ship movement by the second mechanical energy that motor provides；Ac-dc-ac frequency converter, connection are arranged between generator and motor, include rectifying part and Converting Unit；Rectifying part, connects generator, and realization converts the first AC energy as the direct current energy of 24 pulse wave rectifiers；Converting Unit, connection are arranged between rectifying part and motor, convert the direct current energy as the second AC energy of electric motor operation, realize the harmonic wave for reducing by second AC energy.The utility model can effectively inhibit the harmonic wave in ac-dc-ac frequency converter, improve propulsive performance, have good use value.
Description
Technical field
The utility model relates to marine electric power propulsion devices, specifically design a kind of ship electricity based on ac-dc-ac frequency converter
Power propulsion device.
Background technique
Traditional ship generally directly drives propeller to promote by prime mover by crankshaft at present, and watercraft electric propulsion system
Generally it is made of propeller, motor, generator, prime mover and control equipment.Compared with traditional mechanical advancement method, electricity
Power propulsion system has many advantages, such as low noise, good speed adjustment features, high-efficient, energy conservation and environmental protection.
But since the harmonic wave for including in output voltage can cause additional thermal losses simultaneously in watercraft electric propulsion system
And motor electromagnetic torque is caused to generate pulsation, so as to cause propeller vibration, propulsive performance is caused to decline.The utility model is a kind of
Marine electric power propulsion device based on ac-dc-ac frequency converter can effectively inhibit the output harmonic wave for promoting frequency converter.
Utility model content
The utility model watercraft electric propulsion system there are aiming at the problem that, provide a kind of based on ac-dc-ac frequency converter
Marine electric power propulsion device can be effectively inhibited in spot ship electric propulsion system and be exported to the AC energy of motor
Harmonic wave enhances the propulsive performance of watercraft electric propulsion system.
To solve the above problems, the utility model provides a kind of marine electric power propulsion dress based on ac-dc-ac frequency converter
It sets, includes:
Prime mover converts the energy of input as the first mechanical energy；
Generator connects prime mover, converts first mechanical energy as the first AC energy；
Motor connects generator, converts first AC energy as the second mechanical energy；
Propeller connects motor, drives ship movement by second mechanical energy；
Ac-dc-ac frequency converter, connection be arranged between generator and motor, the rectifying part comprising interconnection and
Converting Unit；Rectifying part connects generator, includes several identical three-phase bridge rectifiers, and the first AC energy of conversion is
The direct current energy of 24 pulse wave rectifiers；Converting Unit connection is arranged between rectifying part and motor, defeated comprising several bands LC
The three-phase tri-level inverter of filter out converts the direct current energy as the second AC energy of electric motor operation, realizes suppression
The harmonic wave of second AC energy is made, the second AC energy is converted to the second mechanical energy by motor.
The rectifying part specifically includes identical four three-phase bridge rectifiers, respectively the first rectifier, second whole
Flow device, third rectifier and the 4th rectifier；
The second rectifier is connected in series in first rectifier, and the 4th rectifier is connected in series in third rectifier；And first rectifies
Branch where branch where device and the series connection of the second rectifier is connected with third rectifier and the 4th rectifier is to be connected in parallel；
It is by the first AC energy that four three-phase bridge rectifiers and its connection type realize that rectifying part conversion generator provides
The direct current energy of 24 pulse wave rectifiers.
The three-phase bridge rectifier uses three-phase full-bridge controlled rectifier, comprising 1 transformer and six identical
Thyristor；The transformer is used to convert and be isolated the voltage of first AC energy；Transformer primary side connects generator,
For triangle connection type；Circuit Fault on Secondary Transformer is six thyristors of star-like connection mode and connection, realizes and inhibits 3 subharmonic.
Six thyristors are respectively the first thyristor to the 6th thyristor；First thyristor and the 4th thyristor are same
Phase, the second thyristor and the same phase of the 5th thyristor, third thyristor and the 6th same phase of thyristor；First thyristor, third crystalline substance lock
Pipe, the 5th thyristor anode be all connected with Circuit Fault on Secondary Transformer, and the first thyristor, third thyristor, the 5th thyristor are total
Cathode sets；Second thyristor, the 4th thyristor, the 6th thyristor cathode be all connected with Circuit Fault on Secondary Transformer, and the second thyristor,
4th thyristor, the 6th thyristor are common-anode group；Thyristor pulse by the first thyristor, the second thyristor, third thyristor,
4th thyristor, the 5th thyristor, the 6th thyristor sequence sequentially turn on, 60 degree of the phase phase difference of adjacent thyristor.
The Converting Unit includes three with LC output filter and the three-phase tri-level inverter that is connected in parallel；
The three-phase tri-level inverter include DC side with exchange side；
The DC side connects rectifying part；DC side includes two first capacitors in parallel and the second capacitor, for delaying
Rush quadergy；It is DC side midpoint between first capacitor and the second capacitor；
The exchange side is connected between DC side and generator, includes: three-phase is identical and the first circuit for being connected in parallel,
DC side is connected, the low-order harmonic realized SVPWM control, inhibit exchange side；One LC output filter, the first electricity of connection three-phase
Realize the higher hamonic wave for inhibiting exchange side in road.
First circuit includes:
Four the first feedback diode, the second feedback diode, third feedback diodes, the 4th feedback two sequentially connected
Pole pipe, the quadergy for the lateral DC side feedback of the exchange provide channel；First feedback diode cathode and the 4th
Feedback diode anode connects rectifying part output voltage；It is the first electricity between second feedback diode and third feedback diode
The midpoint on road；
Four full-controlled devices；The full-controlled device is used to control the on, off of itself, and a full-controlled device is connected in parallel
One feedback diode；
Two clamp diodes, respectively the first clamp diode, the second clamp diode；First clamp diode cathode
Connection is arranged between the first feedback diode anode and the second feedback diode cathode, and the connection of the first clamp diode anode is straight
Flow side midpoint；Second clamp diode cathode connects DC side midpoint, and the connection setting of the second clamp diode anode is anti-in third
It presents between diode anode and the 4th feedback diode cathode；The first feedback diode and the are limited by the first clamp diode
The voltage that the corresponding full-controlled device of two feedback diodes is born is no more than the voltage of first capacitor, reduces voltage stress；Pass through
The voltage that two clamp diodes limitation third feedback diode and the corresponding full-controlled device of the 4th feedback diode are born is no more than
The voltage of second capacitor reduces voltage stress.
The LC output filter includes three the first inductance and three third capacitors；The first end of three the first inductance point
Not Lian Jie the first circuit of three-phase midpoint；First inductance second end connects motor；Third capacitor first end connects the first inductance
Second end；The second end of three third capacitors interconnects.
The 4th capacitor and the 5th capacitor being connected in parallel are additionally provided between the rectifying part and Converting Unit, realizing reduces
Harmonic wave in rectifying part output voltage.
The full-controlled device is insulated gate bipolar transistor.
Compared with prior art, the marine electric power propulsion device based on ac-dc-ac frequency converter of the utility model has and makes an uproar
The advantages that sound is low, good speed adjustment features, high-efficient, energy conservation and environmental protection.The propulsion device of the utility model can effectively inhibit its frequency converter
Output harmonic wave, greatly improve propulsive force when ship's navigation.
Detailed description of the invention
In order to illustrate more clearly of technical solutions of the utility model, letter will be made to attached drawing needed in description below
Singly introduce, it should be apparent that, the accompanying drawings in the following description is one embodiment of the utility model, skill common for this field
For art personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings:
Fig. 1 is the marine electric power propulsion apparatus structure schematic diagram of the utility model；
Fig. 2 is the ac-dc-ac frequency converter topology diagram of the marine electric power propulsion device of the utility model；
Fig. 3 is the rectifier structure figure of the marine electric power propulsion device of the utility model；
Fig. 4 is the three-phase tri-level inverter structure figure of the marine electric power propulsion device of the utility model.
In figure: 1, prime mover；2, generator；3, ac-dc-ac frequency converter；4, motor；5, propeller；6, the first rectification
Device；7, the second rectifier；8, third rectifier；9, the 4th rectifier；10, first capacitor；11, the second capacitor；12, the first electricity
Sense；13, third capacitor；14, transformer primary side；15, the first thyristor；16, the second thyristor；17, third thyristor；18,
4th thyristor；19, the 5th thyristor；20, the 6th thyristor；21, full-controlled device；22, the first clamp diode；23, second
Clamp diode；24, the 4th capacitor；25, the 5th capacitor；26, inverter；27, Circuit Fault on Secondary Transformer；28, the first two poles of feedback
Pipe；29, the second feedback diode；30, third feedback diode；31, the 4th feedback diode.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the utility model provides a kind of marine electric power propulsion device based on ac-dc-ac frequency converter, packet
Contain:
Prime mover 1 converts the energy of input as the first mechanical energy；
Generator 2 connects prime mover 1, converts first mechanical energy as the first AC energy；
Motor 4 connects generator 2, converts first AC energy as the second mechanical energy；
Propeller 5 connects motor 4, drives ship movement by second mechanical energy；
Ac-dc-ac frequency converter 3, connection are arranged between generator 2 and motor 4, the rectifying part comprising interconnection
And Converting Unit.The 4th capacitor 24 and the 5th capacitor 25 being connected in parallel are additionally provided between the rectifying part and Converting Unit.
As shown in Fig. 2, the rectifying part connects generator 2, the first AC energy is converted as the direct current of 24 pulse wave rectifiers
Electric energy realizes the harmonic wave for reducing the direct current energy, improves the voltage quality of direct current energy.The rectifying part includes four phases
Same three-phase bridge rectifier, respectively the first rectifier 6, the second rectifier 7, third rectifier 8 and the 4th rectifier 9；The
The second rectifier 7 is connected in series in one rectifier 6, and the 4th rectifier 9 is connected in series in third rectifier 8；And first rectifier 6 and
Branch where the series connection of two rectifiers 7 connect with third rectifier 8 and the 4th rectifier 9 place branch to be connected in parallel, and
Input voltage of the output voltage as inverter 26 after connection.The connection gone here and there by four three-phase bridge rectifiers and its two and two
Mode realizes the first AC energy that rectifying part conversion generator 2 provides for the direct current energy of 24 pulse wave rectifiers, described in reduction
Harmonic wave in direct current energy.
As shown in figure 3, the three-phase bridge rectifier uses three-phase full-bridge controlled rectifier, comprising 1 transformer and
Identical six thyristors；The transformer is used to convert and be isolated the voltage of first AC energy；Transformer primary side
14 connection generators 2, are triangle connection type；Circuit Fault on Secondary Transformer 27 is six thyristors of star-like connection mode and connection,
It realizes and inhibits 3 subharmonic.
As shown in figure 3, six thyristors are respectively 15 to the 6th thyristor 20 of the first thyristor；Six thyristors are equal
For half control device, need trigger pulse that could be connected, the first thyristor 15, third thyristor 17, the 5th thyristor 19 anode
It is all connected with Circuit Fault on Secondary Transformer 27, and the first thyristor 15, third thyristor 17, the 5th thyristor 19 are common cathode group；Second
Thyristor 16, the 4th thyristor 18, the 6th thyristor 20 cathode be all connected with Circuit Fault on Secondary Transformer 27, and the second thyristor 16,
4th thyristor 18, the 6th thyristor 20 are common-anode group；First thyristor 15 and the same phase of the 4th thyristor 18, the second thyristor
16 and the same phase of the 5th thyristor 19, third thyristor 17 and the same phase of the 6th thyristor 20.In the operating condition common cathode group and altogether
Anode unit respectively has a thyristor in the conductive state, and thyristor pulse is brilliant by the first thyristor 15, the second thyristor 16, third
Brake tube 17, the 4th thyristor 18, the 5th thyristor 19, the 6th thyristor 20 sequence sequentially turn on, the phase of adjacent thyristor
60 degree of difference.The pulse of the first thyristor 15, third thyristor 17, the 5th thyristor 19 successively differs 120 ° in common cathode group；
The pulse of the second thyristor 16, the 4th thyristor 18, the 6th thyristor 20 successively differs 120 ° in common-anode group.Above and below phase
The pulse of two thyristors differs 180 °.In figure, e, f are two output ends of rectifier.
As shown in Fig. 2, the direct current energy for 24 pulse wave rectifiers that rectifying part generates, passes through the 4th capacitor being connected in parallel
24, after the filtering of the 5th capacitor 25, the harmonic wave reduced in the direct current energy is realized.
As shown in Fig. 2, the 4th capacitor 24,25 output end of the 5th capacitor and motor in parallel is arranged in Converting Unit connection
Between 4.As shown in figure 4, the Converting Unit includes three with LC output filter and the three-phase tri-level inversion that is connected in parallel
Device 26.Direct current energy after translation filtering is the second AC energy that motor 4 works, and inhibits second AC energy
Harmonic wave.
The three-phase tri-level inverter 26 include DC side with exchange side；
The DC side connects rectifying part；DC side includes two first capacitors 10 in parallel and the second capacitor 11, is used
In buffering quadergy；As shown in figure 4, point O is DC side midpoint between first capacitor 10 and the second capacitor 11；
Tell that exchange side is connected between DC side and generator 2, include: three-phase is identical and the first circuit for being connected in parallel
With a LC (Inductance Capacitance inductance capacitance) output filter, realizes and improve the ac-dc-ac frequency converter
3 equivalent switching frequency, improves the output voltage and power of ac-dc-ac frequency converter 3, and reduces the harmonic wave of its output voltage.
First circuit connection DC side of the parallel three phase connection, realizes SVPWM (space vector pulse width modulation Space
Vector Pulse Width Modulation) it controls, inhibit to exchange the low-order harmonic of side.As shown in figure 4, first electricity
Road includes:
Four the first feedback diode 28, the second feedback diode 29, third feedback diodes the 30, the 4th sequentially connected
Feedback diode 31, the quadergy for the lateral DC side feedback of the exchange provide channel；First feedback diode 28
Cathode and the 4th feedback diode anode connect rectifying part output voltage；Second feedback diode 29 and third feedback diode
It is the midpoint of the first circuit between 30；
Four full-controlled devices 21；The full-controlled device 21 is used to control the on, off of itself, and a full-controlled device 21 is simultaneously
Connection one feedback diode of connection；The full-controlled device 21 is insulated gate bipolar transistor, with switching speed height, switch damage
Consume small, resistance to pulse current impact, input impedance height, the low advantage of on-state voltage drop.
Two clamp diodes, respectively the first clamp diode 22, the second clamp diode 23；First clamp diode
Cathode connection is arranged between the first feedback diode anode and the second feedback diode cathode, and the first clamp diode anode connects
Connect DC side midpoint；Second clamp diode cathode connects DC side midpoint, and the connection setting of the second clamp diode anode is the
Between three feedback diode anodes and the 4th feedback diode cathode；Pass through two poles of the first feedback of the first clamp diode 22 limitation
The voltage that pipe 28 and the corresponding full-controlled device 21 of the second feedback diode 29 are born is no more than the voltage of first capacitor 10, reduces electricity
Compression；Third feedback diode 30 and the corresponding full control device of the 4th feedback diode 31 are limited by the second clamp diode 23
The voltage that part 21 is born is no more than the voltage of the second capacitor 11, reduces voltage stress.
As shown in figure 4, the LC output filter includes three the first inductance 12 and three third capacitors 13；Three first
The first end of inductance 12 is separately connected the midpoint of the first circuit of three-phase；First inductance second end connects motor 4；Third capacitor
One end connects the first inductance second end；The second end of three third capacitors interconnects；A, B, C are respectively band LC output filter
Three-phase tri-level inverter 26 three output ends.The Converting Unit of the ac-dc-ac frequency converter 3 connects by using parallel connection
The three-phase tri-level inverter 26 connect realizes SVPWM control, and the low-order harmonic in Converting Unit output voltage is effectively pressed down
System, and improve the equivalent switching frequency of ac-dc-ac frequency converter 3.But what 3 equivalent switching frequency of ac-dc-ac frequency converter improved
Meanwhile the higher hamonic wave (harmonic wave as caused by switching frequency and its sideband harmonic wave) in output voltage, it can be with switching frequency
Increase and increase, effectively inhibits the higher hamonic wave of 26 output voltage of three-phase tri-level inverter by using LC filter.This reality
It is combined, is inhibited in output voltage with LC output filter by being controlled using SVPWM ac-dc-ac frequency converter 3 with novel
High order and low-order harmonic guarantee that three-phase tri-level inverter 26 meets harmonic wave code requirement in defined reference frequency output.
Compared with prior art, the marine electric power propulsion device based on ac-dc-ac frequency converter 3 of the utility model has
The advantages that low noise, good speed adjustment features, high-efficient, energy conservation and environmental protection.The propulsion device of the utility model can effectively inhibit its frequency conversion
The output harmonic wave of device greatly improves propulsive force when ship's navigation.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can be readily occurred in various
Equivalent modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this is practical
Novel protection scope should be subject to the protection scope in claims.
Claims (9)
1. a kind of marine electric power propulsion device based on ac-dc-ac frequency converter, characterized by comprising:
Prime mover converts the energy of input as the first mechanical energy；
Generator connects prime mover, converts first mechanical energy as the first AC energy；
Motor connects generator, converts first AC energy as the second mechanical energy；
Propeller connects motor, drives ship movement by second mechanical energy；
Ac-dc-ac frequency converter, connection are arranged between generator and motor, rectifying part and inversion comprising interconnection
Part；Rectifying part connects generator, includes several identical three-phase bridge rectifiers, converts the first AC energy as 24 arteries and veins
The direct current energy of wave rectification；Converting Unit connection is arranged between rectifying part and motor, includes the LC output filter of several bands
The three-phase tri-level inverter of wave device converts the direct current energy as the second AC energy of electric motor operation, realizes and inhibit institute
The harmonic wave of the second AC energy is stated, the second AC energy is converted to the second mechanical energy by motor.
2. the marine electric power propulsion device based on ac-dc-ac frequency converter as described in claim 1, which is characterized in that described whole
Stream part specifically includes identical four three-phase bridge rectifiers, respectively the first rectifier, the second rectifier, third rectifier
With the 4th rectifier；
The second rectifier is connected in series in first rectifier, and the 4th rectifier is connected in series in third rectifier；And first rectifier and
Branch where branch where the series connection of second rectifier is connected with third rectifier and the 4th rectifier is to be connected in parallel；Pass through
Four three-phase bridge rectifiers and its connection type realize that the first AC energy that rectifying part conversion generator provides is 24 arteries and veins
The direct current energy of wave rectification.
3. the marine electric power propulsion device based on ac-dc-ac frequency converter as claimed in claim 2, which is characterized in that described three
Phase bridge rectifier uses three-phase full-bridge controlled rectifier, includes 1 transformer and identical six thyristors；The transformation
Device is used to convert and be isolated the voltage of first AC energy；Transformer primary side connects generator, is triangle connection side
Formula；Circuit Fault on Secondary Transformer is six thyristors of star-like connection mode and connection, realizes and inhibits 3 subharmonic.
4. the marine electric power propulsion device based on ac-dc-ac frequency converter as claimed in claim 3, which is characterized in that described six
A thyristor is respectively the first thyristor to the 6th thyristor；First thyristor and the same phase of the 4th thyristor, the second thyristor and
The same phase of 5th thyristor, third thyristor and the 6th same phase of thyristor；First thyristor, third thyristor, the 5th thyristor
Anode is all connected with Circuit Fault on Secondary Transformer, and the first thyristor, third thyristor, the 5th thyristor are common cathode group；Second brilliant lock
Pipe, the 4th thyristor, the 6th thyristor cathode be all connected with Circuit Fault on Secondary Transformer, and the second thyristor, the 4th thyristor, the 6th
Thyristor is common-anode group；The first thyristor, the second thyristor, third thyristor, the 4th thyristor, the 5th are pressed in thyristor pulse
Thyristor, the 6th thyristor sequence sequentially turn on, 60 degree of the phase phase difference of adjacent thyristor.
5. the marine electric power propulsion device based on ac-dc-ac frequency converter as described in claim 1, which is characterized in that described inverse
Become part comprising three with LC output filter and the three-phase tri-level inverter that is connected in parallel；
The three-phase tri-level inverter include DC side with exchange side；
The DC side connects rectifying part；DC side includes two first capacitors in parallel and the second capacitor, for buffering nothing
Function amount；It is DC side midpoint between first capacitor and the second capacitor；
The exchange side is connected between DC side and generator, includes: three-phase is identical and the first circuit for being connected in parallel, connection
DC side, the low-order harmonic realized SVPWM control, inhibit exchange side；One LC output filter, connection the first circuit of three-phase are real
Now inhibit the higher hamonic wave of exchange side.
6. the marine electric power propulsion device based on ac-dc-ac frequency converter as claimed in claim 5, which is characterized in that described
One circuit includes:
Four the first feedback diode, the second feedback diode, third feedback diodes, the 4th two poles of feedback sequentially connected
Pipe, the quadergy for the lateral DC side feedback of the exchange provide channel；First feedback diode cathode and the 4th is instead
It presents diode anode and connects rectifying part output voltage；It is the first circuit between second feedback diode and third feedback diode
Midpoint；
Four full-controlled devices；The full-controlled device controls the on, off of itself, and a full-controlled device is connected in parallel a feedback
Diode；
Two clamp diodes, respectively the first clamp diode, the second clamp diode；The connection of first clamp diode cathode
It is arranged between the first feedback diode anode and the second feedback diode cathode, the first clamp diode anode connects DC side
Midpoint；Second clamp diode cathode connects DC side midpoint, and the second clamp diode anode connection setting feeds back two in third
Between pole pipe anode and the 4th feedback diode cathode；The first feedback diode and second is limited instead by the first clamp diode
The voltage that the voltage that the corresponding full-controlled device of diode is born is no more than first capacitor is presented, voltage stress is reduced；Pass through the second pincers
The voltage that position diode limitation third feedback diode and the corresponding full-controlled device of the 4th feedback diode are born is no more than second
The voltage of capacitor reduces voltage stress.
7. the marine electric power propulsion device based on ac-dc-ac frequency converter as claimed in claim 6, which is characterized in that the LC
Output filter includes three the first inductance and three third capacitors；The first end of three the first inductance is separately connected three-phase first
The midpoint of circuit；First inductance second end connects motor；Third capacitor first end connects the first inductance second end；Three thirds
The second end of capacitor interconnects.
8. the marine electric power propulsion device based on ac-dc-ac frequency converter as described in claim 1, which is characterized in that described whole
The 4th capacitor and the 5th capacitor being connected in parallel are additionally provided between stream part and Converting Unit, realizing reduces rectifying part output electricity
Harmonic wave in pressure.
9. the marine electric power propulsion device based on ac-dc-ac frequency converter as claimed in claim 6, which is characterized in that described complete
Control device is insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920197089.3U CN209479942U (en) | 2019-02-14 | 2019-02-14 | A kind of marine electric power propulsion device based on ac-dc-ac frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920197089.3U CN209479942U (en) | 2019-02-14 | 2019-02-14 | A kind of marine electric power propulsion device based on ac-dc-ac frequency converter |
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| CN209479942U true CN209479942U (en) | 2019-10-11 |
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| CN201920197089.3U Expired - Fee Related CN209479942U (en) | 2019-02-14 | 2019-02-14 | A kind of marine electric power propulsion device based on ac-dc-ac frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109677582A (en) * | 2019-02-14 | 2019-04-26 | 上海海事大学 | A kind of marine electric power propulsion device based on ac-dc-ac frequency converter |
| CN115259294A (en) * | 2022-08-08 | 2022-11-01 | 华北电力科学研究院有限责任公司 | Water body pH adjusting device and method |
-
2019
- 2019-02-14 CN CN201920197089.3U patent/CN209479942U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109677582A (en) * | 2019-02-14 | 2019-04-26 | 上海海事大学 | A kind of marine electric power propulsion device based on ac-dc-ac frequency converter |
| CN115259294A (en) * | 2022-08-08 | 2022-11-01 | 华北电力科学研究院有限责任公司 | Water body pH adjusting device and method |
| CN115259294B (en) * | 2022-08-08 | 2023-10-27 | 华北电力科学研究院有限责任公司 | Device and method for adjusting PH of water body |
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