CN104467027A - Intelligent shore power system and grid connection method - Google Patents
Intelligent shore power system and grid connection method Download PDFInfo
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- CN104467027A CN104467027A CN201410740635.5A CN201410740635A CN104467027A CN 104467027 A CN104467027 A CN 104467027A CN 201410740635 A CN201410740635 A CN 201410740635A CN 104467027 A CN104467027 A CN 104467027A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
Abstract
The invention relates to an intelligent shore power system which comprises a variable-frequency power source, a switching network and an electric reactor. The variable-frequency power source comprises a rectifying module, an inversion module, a bus, a variable-frequency power source controller, a communication module and a power grid sampling module, wherein the rectifying module, the bus, the inversion module, the variable-frequency power source controller, the power grid sampling module, the switching network and the electric reactor are sequentially connected; the power grid sampling module obtains external ship power grid information in real time and transmits the external ship power grid information to the variable-frequency power source controller, the variable-frequency power source controller controls the switching network to switch power grid systems to be matched with a ship power grid according to the external ship power grid information, and shore power grid information is generated; when the external ship power grid information and the shore power grid information are the same, the variable-frequency power source controller controls the inversion module to be connected with the electric reactor, and after voltage is stabilized, the variable-frequency power source controller controls disconnection of an external marine auxiliary machine and the ship power grid through the communication module.
Description
Technical field
The present invention relates to bank electric system, particularly relate to a kind of bank electric system of Intelligent Recognition network of ship no-harass switch.
Background technology
Boats and ships are in the navigation of port district and reach port period, mainly utilize diesel generating set (subsidiary engine) to generate electricity and meet boats and ships need for electricity, boats and ships use the diesel generating set carried to need a large amount of admiralty fuel oil (heavy oil or diesel oil) that burns, while fuel consumption obtains electric power, boats and ships produce pollutant emission.China, as carbon emission state maximum in the world, makes the promise of " to the year two thousand twenty, the CO2 emission of Chinese entity GDP declined 40% ~ 45% than 2005 " to the whole world.Department of Transportation clearly proposes: " boats and ships of actively pushing forward to reach port use bank electricity; strive that newly-built harbour and the marine equipment construction boats and ships that reach port use the installations and facilities of bank electricity, use bank electricity at International Cruising harbour, main passenger wharf, major port, inland river and 30% big intermodal container terminal and the bulk cargo terminals boats and ships that realize reaching port ".
The technology of large-scale stabilized voltage power supply comparative maturity at home, but boats and ships connect bank electricity there is convenience and adaptive problem.
General use bank electricity need first be stopped using boats and ships power itself system (diesel generating set), and then accesses shore electric power, after finishing using, first need disconnect shore electric power, rear access power itself system.Access and opening operation complexity, and start-up course internal unit impacts large.For proterctive equipment safety, the mode of sequence starting need be adopted, reduce power network fluctuation to the impact of equipment, consuming time longer.If berthing time is of short duration, the operating time occupation proportion of access and disconnection bank electricity is excessive, affects boats and ships self operating efficiency.
Therefore, part boats and ships are caused to be reluctant to access bank electric system.So the breakthrough of demand switching undisturbed technology, but in currently available technology, main switching undisturbed technology has following several:
1. introduce additional motor to control.But the method need introduce additional motor, in earlier stage costly, and power transmission efficiency is low.
2. add boats and ships communication electrical network testing fixture, and control network of ship be incorporated to bank electricity the moment.The method can not adapt to multiple electricity consumption standard, and during as 60Hz, civil power cannot be grid-connected.
3. high-low pressure frequency converter is adopted.The method is directly incorporated into, and has transient impact, and stabilization time is slow, and the disengagement time cannot accurately determine, affects ship equipment safety.
Therefore, it is possible to be suitable for multiple electric standard, how to make that network of ship undisturbed is grid-connected becomes problem demanding prompt solution.
Summary of the invention
Object of the present invention can not be suitable for multiple electric standard to solve existing bank electricity exactly, and grid-connected generation transient impact, affect the technical problem of ship equipment safety, the invention provides a kind of intelligent bank electric system, concrete technical scheme is as follows:
A kind of intelligent bank electric system, comprise variable frequency power supply, handover network and reactor, described variable frequency power supply comprises rectification module, inversion module, bus, variable frequency power controller, communication module, electrical network sampling module, described rectification module, bus, inversion module, variable frequency power controller, electrical network sampling module, handover network are connected successively with reactor, and described communication module is connected with described variable frequency power controller, and described bus is connected with described variable frequency power controller, described electrical network sampling module connects outside ship power supply cable by sample line, the outside network of ship information of described electrical network sampling module Real-time Obtaining, and by outside network of ship information transmission to described variable frequency power controller, described variable frequency power controller controls described handover network switching electrical network standard according to described network of ship information and mates described network of ship, and generate bank electricity electric network information, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described inversion module and is connected with described reactor, after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by communication module and network of ship disconnects.
Further, described handover network comprises multi-group vacuum contactor and transformer, described variable frequency power controller, according to described outside network of ship information, adjusts described transformer parameter and multi-group vacuum contactor to control inversion module output voltage and described outside network of ship information matches.
Further, be connected with the first vacuum contactor between described inversion module and described reactor, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described first vacuum contactor and closes a floodgate.
Further, described bank electricity electric network information is at least one in the frequency of variable frequency power supply output voltage, phase place and amplitude; Described outside network of ship information is at least one in the frequency of network of ship voltage, phase place and amplitude.
Further, described variable frequency power supply also comprises bus sampling module, described bus sampling module is all connected with described bus and described variable frequency power controller, described bus sampling module obtains the instantaneous voltage information of described bus, and described information of voltage is transferred to described variable frequency power controller, described variable frequency power controller adopts bus-bar collocation algorithm, improves variable frequency power supply and exports response.
Further, described electrical network sampling module connects any two-phase in outside network of ship three electricity respectively by two sample line, described sampling module obtains described two phase voltage signals, and described voltage signal is transferred to described variable frequency power controller, described variable frequency power controller, by recognizer, draws described outside network of ship information.
Further, comprise the second vacuum contactor, described variable frequency power supply is connected by described second vacuum contactor with bank electricity electrical network/disconnects, described sampling module obtains variable frequency power supply loop current information, and described current information is transferred to described variable frequency power controller, if described current information exceeds preset current scope, described variable frequency power controller controls described second vacuum contactor and disconnects.
A combination method for bank electric system, comprises the steps:
Outside network of ship information described in described electrical network sampling module Real-time Obtaining, and described outside network of ship information is sent to described variable frequency power controller;
Described variable frequency power controller is switched to according to described outside network of ship information control handover network and mates with electric system of described outside network of ship;
Described variable frequency power controller generates bank electricity electric network information, when described bank electricity electric network information is identical with described outside network of ship information, described variable frequency power controller control the electric electrical network of bank and described outside network of ship grid-connected;
Described variable frequency power controller controls outside marine auxiliary by described communication module and described network of ship disconnects.
Further, described variable frequency power controller control bank electricity electrical network and described outside network of ship grid-connected after, described method also comprises step:
By improving variable frequency power supply output voltage amplitude, outside boats and ships load being powered by marine auxiliary and transfers to bank electricity mains supply.
Further, described variable frequency power controller generates bank electricity electric network information, and when described bank electricity electric network information is identical with described outside network of ship information, the concrete steps that described variable frequency power controller control bank electricity electrical network is connected with described outside network of ship comprise:
Described variable frequency power controller passes through phase locked algorithm according to variable frequency power supply output voltage frequency and amplitude, raw voltage phase information, when variable frequency power supply output voltage and described outside network of ship are with during frequently with identical width, described variable frequency power controller controls described first vacuum contactor and closes a floodgate, described bank electricity electrical network and described outside network of ship grid-connected.
Compared to prior art, the invention provides a kind of intelligent bank electric system, its main beneficial effect is: the present invention obtains the electric voltage frequency of boats and ships, phase place and amplitude information by electrical network sampling module, sampling cable is without the need to going on board, easy to connect, accuracy of detection is high, and speed is fast; By handover network automatic switchover power supply system coupling network of ship, without the need to manual intervention, more intelligent, accuracy is high; By variable frequency power supply Based Intelligent Control, voltage exports and responds rapid, accurate, good stability; By ethernet network and boats and ships communication, control vacuum contactor action on boats and ships, to coordinate frequency converter voltage to export, realize undisturbed grid-connected, adopt wireless ethernet communication, technology maturation, fault freedom is good, can support that multiple boats and ships carry agreement, compatible good, go on board without the need to communication line, simplify cable of going on board and connect; Stability of grid connection runs several cycle, and after network of ship is stable, ship power supply system departs from, and electrical network is without impact, and network process does not affect load operation, realizes unperturbed grid-connected.
Accompanying drawing explanation
Fig. 1 is the structure block diagram of the intelligent bank electric system of the embodiment of the present invention 1.
Fig. 2 is the structure block diagram of the intelligent bank electric system of the embodiment of the present invention 2.
Fig. 3 is the structure block diagram of the intelligent bank electric system of the embodiment of the present invention 3.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not used for limiting the present invention.
Embodiment 1
Refer to Fig. 1, Fig. 1 is the structure block diagram of intelligent bank electric system.
The invention provides a kind of intelligent bank electric system, comprise variable frequency power supply, handover network and reactor, described reactor is three reactors, and described variable frequency power supply comprises rectification module, inversion module, bus, variable frequency power controller, communication module, electrical network sampling module, described rectification module, bus, inversion module, variable frequency power controller, electrical network sampling module, handover network are connected successively with reactor, and described communication module is connected with described variable frequency power controller, and described bus is connected with described variable frequency power controller, described electrical network sampling module connects outside ship power supply cable by sample line, the outside network of ship information of described electrical network sampling module Real-time Obtaining, and by outside network of ship information transmission to described variable frequency power controller, described variable frequency power controller controls described handover network switching electrical network standard according to described network of ship information and mates described network of ship, and generate bank electricity electric network information, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described inversion module and is connected with described reactor, after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by communication module and outside network of ship disconnects.Described communication module is ethernet communication module, and described outside boats and ships comprise communication module, and described intelligent bank electric system is connected with described outside marine communication.
It should be noted that, described bank electricity electric network information is at least one in the frequency of variable frequency power supply output voltage, phase place and amplitude; Described outside network of ship information is at least one in the frequency of network of ship voltage, phase place and amplitude.
Further, described handover network comprises multi-group vacuum contactor and transformer, described variable frequency power controller is according to described outside network of ship information, and the combined floodgate ratio of described transformer parameter and multi-group vacuum contactor that adjusts is to control inversion module output voltage and described outside network of ship information matches.
Embodiment 2
Refer to Fig. 2, Fig. 2 is the structure block diagram of intelligent bank electric system.
The invention provides a kind of intelligent bank electric system, comprise variable frequency power supply, handover network and reactor, described variable frequency power supply comprises rectification module, inversion module, bus, variable frequency power controller, communication module, electrical network sampling module, described rectification module, bus, inversion module, variable frequency power controller, electrical network sampling module, handover network are connected successively with reactor, and described communication module is connected with described variable frequency power controller, and described bus is connected with described variable frequency power controller, the first vacuum contactor is connected with between described inversion module and described reactor, described electrical network sampling module connects outside ship power supply cable by sample line, the outside network of ship information of described electrical network sampling module Real-time Obtaining, and by outside network of ship information transmission to described variable frequency power controller, described variable frequency power controller controls described handover network switching electrical network standard according to described network of ship information and mates described network of ship, and generate bank electricity electric network information, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described first vacuum contactor and closes a floodgate, after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by communication module and network of ship disconnects.
It should be noted that, described bank electricity electric network information is at least one in the frequency of variable frequency power supply output voltage, phase place and amplitude; Described outside network of ship information is at least one in the frequency of network of ship voltage, phase place and amplitude.
Further, described handover network comprises multi-group vacuum contactor and transformer, described variable frequency power controller, according to described outside network of ship information, adjusts described transformer parameter and multi-group vacuum contactor to control inversion module output voltage and described outside network of ship information matches.
Be understandable that, network of ship comprises the 3rd vacuum contactor and the 4th vacuum contactor further, described variable frequency power controller is by the 3rd vacuum contactor and described 4th vacuum contactor described in ethernet communication module controls, and described variable frequency power controller is connected by controlling the combined floodgate of described 3rd vacuum contactor/open a sluice gate to control described network of ship with the electric electrical network of described bank/disconnects.Described variable frequency power controller is by controlling the combined floodgate/open a sluice gate the connection/disconnection controlling described outside marine auxiliary and described network of ship of described 4th vacuum contactor.
Be understandable that, suppose that three-phase high-voltage electrical network is 6600V/50Hz on the bank, network of ship is 690V/60Hz, and low pressure is gone on board, and access bank electricity electrical network process is as follows:
After boats and ships pull in shore, boats and ships are powered by subsidiary engine, and to ensure that network of ship is powered stable, described 3rd vacuum contactor disconnects, and described first vacuum contactor disconnects, access sampling cable L1.
As shown in Figure 2, described electrical network sampling module sampling cable is connected on circuit A point.Described electrical network sampling module two sample line connect any two-phase in three-phase electricity respectively, after described sampling cable access, described electrical network sampling module obtains two phase voltage signals in described outside network of ship three, and described voltage signal is transferred to described variable frequency power controller, described variable frequency power controller passes through recognizer, draw the electric voltage frequency of A electricity, phase place and amplitude information, because A point connects network of ship by sample line, the information of voltage of described A point is the information of voltage of described outside network of ship.
Described variable frequency power controller is according to the handover network transformer parameter in typing variable frequency power controller, and the 690V/60Hz information of voltage recognized, the multi-group vacuum contactor adjusted in described handover network makes voltage input-output ratio be 9:1, calculated by described variable frequency power controller, automatic adjustment described inversion module output amplitude is that the voltage of 6210V to be gone on board demand with satisfied outside boats and ships voltage 690V low pressure, and adjusts output voltage frequency to 60Hz.
It should be noted that, adjust described multi-group vacuum contactor and change input and output voltage ratio, described input and output voltage ratio set has multiple, such as 9:1,5:2,3:5,1:3 etc., adjust the multi-group vacuum contactor in described handover network according to the voltage ratio inputted and needs export, if new power supply system need be increased, only need increase suitable converting unit in handover network, and the converting unit parameter new to the typing of described intelligent bank electric system, to realize rapidly the access of New Schemes.
It is 690V/60Hz that described variable frequency power controller controls described inversion module output voltage, variable frequency power controller adopts phase locked algorithm, the voltage phase information of network of ship is obtained by electrical network sampling module, network of ship information described in Real-time Obtaining, when variable frequency power supply output voltage and described outside boats and ships voltage reach with during frequently with identical width, described variable frequency power controller controls described first vacuum contactor and described 3rd vacuum contactor closes a floodgate, and now described bank electricity electrical network is incorporated to outside network of ship.Stablize grid-connected after, by improve output voltage amplitude, by load on ship from marine auxiliary power transfer to bank electricity power supply.Stablize grid-connected after, described variable frequency power controller controls described 4th vacuum contactor separating brake by communication module, completes network of ship no-harass switch process.
It should be noted that, described intelligent bank electric system is gone on board for low pressure and high pressure is gone on board all applicable, assuming that network of ship is 690V/60Hz, after bank electric system recognizes network of ship parameter, is judged to be that low pressure is gone on board.Bank electric system is by the handover network transformer parameter in typing variable frequency power controller, and the 690V/60Hz information of voltage recognized, and adjustment multi-group vacuum contactor meets low pressure and exports demand, and calculates output voltage frequency, phase place and amplitude.
Assuming that network of ship is 6600V/60Hz, after bank electric system recognizes network of ship parameter, be judged to be that high pressure is gone on board.Bank electric system is by the handover network transformer parameter in typing variable frequency power controller, and the 6600V/60Hz information of voltage recognized, and adjustment multi-group vacuum contactor meets High voltage output demand, and calculates output voltage frequency, phase place and amplitude.
Embodiment 3
Refer to Fig. 3, Fig. 3 is the structure block diagram of intelligent bank electric system.
A kind of intelligent bank electric system, comprise variable frequency power supply, handover network and reactor, described variable frequency power supply comprises rectification module, inversion module, bus, variable frequency power controller, communication module, electrical network sampling module, described rectification module, bus, inversion module, variable frequency power controller, electrical network sampling module, handover network are connected successively with reactor, and described communication module is connected with described variable frequency power controller, and described bus is connected with described variable frequency power controller, described electrical network sampling module connects outside ship power supply cable by sample line, the outside network of ship information of described electrical network sampling module Real-time Obtaining, and by outside network of ship information transmission to described variable frequency power controller, described variable frequency power controller controls described handover network switching electrical network standard according to described network of ship information and mates described network of ship, and generate bank electricity electric network information, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described inversion module and is connected with described reactor, after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by communication module and network of ship disconnects.
Further, described variable frequency power supply also comprises bus sampling module, described bus sampling module is all connected with described bus and described variable frequency power controller, when inputting power network fluctuation, fluctuation signal directly reacts on the bus of major loop, and described bus sampling module obtains the instantaneous voltage information of described bus, and described information of voltage is transferred to described variable frequency power controller, described variable frequency power controller adopts bus-bar collocation algorithm, improves variable frequency power supply and exports response.
For guaranteeing described intelligent bank electric system power supply safety, described intelligent bank electric system also comprises the second vacuum contactor, described variable frequency power supply is connected by described second vacuum contactor with bank electricity electrical network/disconnects, described sampling module obtains variable frequency power supply loop current information, and described current information is transferred to described variable frequency power controller, if described current information exceeds preset current scope, described variable frequency power controller controls described second vacuum contactor and disconnects.
Embodiment 4
On the basis of embodiment 1-embodiment 3, the invention provides a kind of combination method of intelligent bank electric system, it is characterized in that, comprise the steps:
S1: outside network of ship information described in described electrical network sampling module Real-time Obtaining, and described outside network of ship information is sent to described variable frequency power controller.
S2: described variable frequency power controller is switched to according to described outside network of ship information control handover network and mates with electric system of described outside network of ship.
S3: described variable frequency power controller generates bank electricity electric network information, when described bank electricity electric network information is identical with described outside network of ship information, described variable frequency power controller control the electric electrical network of bank and described outside network of ship grid-connected.
S31: described variable frequency power controller passes through phase locked algorithm according to variable frequency power supply output voltage frequency and amplitude, raw voltage phase information.
S32: when variable frequency power supply output voltage and described outside network of ship are with during frequently with identical width, described variable frequency power controller controls described first vacuum contactor and closes a floodgate, described bank electricity electrical network and described outside network of ship grid-connected.
S4: by improving variable frequency power supply output voltage amplitude, is powered outside boats and ships load by marine auxiliary and transfers to bank electricity mains supply.
S5: after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by described communication module and described network of ship disconnects, with realize bank electricity electrical network and outside network of ship unperturbed grid-connected.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. an intelligent bank electric system, is characterized in that, comprises variable frequency power supply, handover network and reactor, and described variable frequency power supply comprises rectification module, inversion module, bus, variable frequency power controller, communication module, electrical network sampling module, described rectification module, bus, inversion module, variable frequency power controller, electrical network sampling module, handover network are connected successively with reactor, and described communication module is connected with described variable frequency power controller, and described bus is connected with described variable frequency power controller, described electrical network sampling module connects outside ship power supply cable by sampling cable, the outside network of ship information of described electrical network sampling module Real-time Obtaining, and by outside network of ship information transmission to described variable frequency power controller, described variable frequency power controller controls described handover network switching electrical network standard according to described network of ship information and mates described network of ship, and generate bank electricity electric network information, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described inversion module and is connected with described reactor, after voltage stabilization, described variable frequency power controller controls outside marine auxiliary by communication module and network of ship disconnects.
2. intelligent bank electric system according to claim 1, it is characterized in that, described handover network comprises multi-group vacuum contactor and transformer, described variable frequency power controller, according to described outside network of ship information, adjusts described transformer parameter and multi-group vacuum contactor to control inversion module output voltage and described outside network of ship information matches.
3. intelligent bank electric system according to claim 1, it is characterized in that, the first vacuum contactor is connected with between described inversion module and described reactor, when described outside network of ship information is identical with described bank electricity electric network information, described variable frequency power controller controls described first vacuum contactor and closes a floodgate.
4. according to the arbitrary described intelligent bank electric system of claim 1-3, it is characterized in that, described bank electricity electric network information is at least one in the frequency of variable frequency power supply output voltage, phase place and amplitude; Described outside network of ship information is at least one in the frequency of network of ship voltage, phase place and amplitude.
5. intelligent bank electric system according to claim 1, it is characterized in that, described variable frequency power supply also comprises bus sampling module, described bus sampling module is all connected with described bus and described variable frequency power controller, described bus sampling module obtains the instantaneous voltage information of described bus, and described information of voltage is transferred to described variable frequency power controller, described variable frequency power controller adopts bus-bar collocation algorithm, improves variable frequency power supply and exports response.
6. intelligent bank electric system according to claim 1, it is characterized in that, described electrical network sampling module connects any two-phase in outside network of ship three electricity respectively by two sample line, described sampling module obtains described two phase voltage signals, and described voltage signal is transferred to described variable frequency power controller, described variable frequency power controller, by recognizer, draws described outside network of ship information.
7. intelligent bank electric system according to claim 1, it is characterized in that, comprise the second vacuum contactor, described variable frequency power supply is connected by described second vacuum contactor with bank electricity electrical network/disconnects, described sampling module obtains variable frequency power supply loop current information, and described current information is transferred to described variable frequency power controller, if described current information exceeds preset current scope, described variable frequency power controller controls described second vacuum contactor and disconnects.
8. a combination method for the arbitrary described bank electric system of claim 1-7, is characterized in that, comprise the steps:
Outside network of ship information described in described electrical network sampling module Real-time Obtaining, and described outside network of ship information is sent to described variable frequency power controller;
Described variable frequency power controller is switched to according to described outside network of ship information control handover network and mates with electric system of described outside network of ship;
Described variable frequency power controller generates bank electricity electric network information, when described bank electricity electric network information is identical with described outside network of ship information, described variable frequency power controller control the electric electrical network of bank and described outside network of ship grid-connected;
Described variable frequency power controller controls outside marine auxiliary by described communication module and described network of ship disconnects.
9. the combination method of bank electric system according to claim 8, is characterized in that, described variable frequency power controller control bank electricity electrical network and described outside network of ship grid-connected after, described method also comprises step:
By improving variable frequency power supply output voltage amplitude, outside boats and ships load being powered by marine auxiliary and transfers to bank electricity mains supply.
10. the combination method of bank electric system according to claim 8, it is characterized in that, described variable frequency power controller generates bank electricity electric network information, when described bank electricity electric network information is identical with described outside network of ship information, the concrete steps that described variable frequency power controller control bank electricity electrical network is connected with described outside network of ship comprise:
Described variable frequency power controller passes through phase locked algorithm according to variable frequency power supply output voltage frequency and amplitude, raw voltage phase information, when variable frequency power supply output voltage and described outside network of ship are with during frequently with identical width, described variable frequency power controller controls described first vacuum contactor and closes a floodgate, described bank electricity electrical network and described outside network of ship grid-connected.
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Application publication date: 20150325 |