CN107240915A - Shore electric power system - Google Patents
Shore electric power system Download PDFInfo
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- CN107240915A CN107240915A CN201610187293.8A CN201610187293A CN107240915A CN 107240915 A CN107240915 A CN 107240915A CN 201610187293 A CN201610187293 A CN 201610187293A CN 107240915 A CN107240915 A CN 107240915A
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- module group
- power supply
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- group
- slave
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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
Abstract
The present invention relates to shore electric power system, including：A plurality of module groups in parallel (G1 ..., Gn), each module group includes：A rectifier (21), an inverter (22) and one first wave filter (23) being sequentially connected in series, and a control unit (24), it can control each module group to realize grid-connected connection.Independently of one another, the quantity therefore, it is possible to module group in parallel is unrestricted, and the capacity scalability of the shore electric power system is good for modules group.
Description
Technical field
The present invention relates to shore electric power technical field, more particularly to shore electric power system.
Background technology
Early stage is pulled in shore after berthing when ship, generally uses auxiliary diesel generator powered, and diesel-driven generator is generated at harbour
Serious exhaust emission and noise pollution.Shore electric power is to use land bank side power supply to provide power supply to ship after ship pulls in shore
And the mode for replacing Diesel engine operation to generate electricity, the development at green harbour can be promoted significantly by clean shore electric power.
Shore electric power system (also known as bank frequency-converting power supply, or electronic still formula shore electric power system) is specific to
The severe use environment such as the high temperature such as bank harbour, high humidity, highly corrosive, big load impact and be specifically designed the high-power of manufacture
Variable-frequency power sources equipment.Shore electric power system is powered to ship electrical equipment, be widely used in shipbuilding and repair shop,
The occasions such as ocean drilling platforms, bank harbour.Network of ship is typically 60Hz, the U.S., Japan and other countries harbour distribution network standard
It is 60Hz, the harbour distribution network standard such as China and Europe is typically 50Hz, so 50Hz large power supply conversion equipments are developed,
Stop port ship power supply to 60Hz to be of great importance.
Fig. 1 is a kind of structural representation of shore electric power system of prior art.From figure 1 it appears that the shore electric power
Rectifier transformer 12, a plurality of frequency converters 13 in parallel, sine wave filter 14 and the output that system includes being sequentially connected in series become
Depressor 15.External industrial power network 11 (such as 50Hz) is converted to power supply that ship 16 uses (such as by the shore electric power system
60Hz).Wherein frequency converter 13 includes the rectifier 131 and inverter 132 of series connection.Multiple parallel connections of frequency converter 13 are by altogether
Realized with dc bus.The limited amount system of frequency converter 13 in parallel, is usually no more than 4 in system.Multiple inversions
Outlet side connects the sine wave filter 14 of Large Copacity to realize sinewave output after the parallel connection of device 13.
The content of the invention
An object of the present invention is to provide shore electric power system, and its capacity scalability is good.
One aspect of the present invention, which provides offer shore electric power system, to be included：
A plurality of module groups in parallel, each module group includes：A rectifier, an inverter and one first filter being sequentially connected in series
Ripple device, and
One control unit, it can control each module group to realize grid-connected connection.
Independently of one another, the quantity therefore, it is possible to module group in parallel is unrestricted, the appearance of the shore electric power system for modules group
Measure (or power) scalability good.
In a kind of schematical embodiment of shore electric power system, a plurality of module groups in parallel include a primary module group,
With at least one slave module group；At least one slave module group one by one or simultaneously with primary module group synchronism output and grid-connected connection.
A plurality of module groups in parallel are by the packet of primary module group and slave module group, and slave module group is on the basis of primary module group
Carry out grid-connected connection so that grid-connected connection is simple, effectively.
In another schematical embodiment of shore electric power system, the inverter in each slave module group includes：
One stable state control module, the frequency and voltage of its power supply that can be exported to inverter are independently controlled and realize stabilization
Output；With
One synchronization module, it can adjust frequency, voltage and the phase angle of the power supply of slave module group output.
The cooperation of stable state control module and synchronization module can ensure what the module group of parallel connection was exported in grid-connected connection well
Frequency, voltage and the phase angle of power supply are synchronous, are easy to the grid-connected connection of module group.
In another schematical embodiment of shore electric power system, each slave module group also includes：One first switch,
Rectifier, inverter, the first wave filter and first switch in same slave module group are sequentially connected in series；
Each slave module group and primary module group synchronism output and grid-connected connection is specifically included：Slave module group passes through synchronous mould therein
Block adjusts frequency, power supply and the phase angle of the power supply of its output until same with the frequency of the power supply of primary module output, power supply and phase angle
Step, and by inverter therein to control unit send one it is grid-connected allow order, control unit receives grid-connected allow after order
First switch in control slave module group closes to realize the grid-connected connection with primary module group.The grid-connected attachment structure is simple.
In another schematical embodiment of shore electric power system, each slave module group also includes：
One first sensor, the power supply of slave module group output where it can detect it；With
One second sensor, it can detect the power supply of the primary module group output；
In the same slave module group, the power supply and the primary module group of the synchronization module slave module group output are defeated
The power supply gone out, and when the power supply for power supply and the primary module group output that the slave module group is exported is asynchronous, adjustment is described
The power supply of slave module group output is until the line lock that the primary module group is exported.
Each slave module group realizes the power supply exported to it and main mould by the first sensor in it and second sensor respectively
The detection of the power supply of block group output, and then it is compared, adjusts and realize the synchronism output of the slave module group and primary module group,
Synchronous effect is good.
In another schematical embodiment of shore electric power system, one in a plurality of module groups in parallel is selected
For primary module group, remaining module group is chosen to be slave module group；The slave module group one by one or simultaneously with the primary module group (G1)
Synchronism output and grid-connected connection.
The shore electric power system neatly can regard any one module group selection in a plurality of module groups in parallel as main mould
Block group, the flexibility of system is good.
In another schematical embodiment of shore electric power system, each inverter includes：
One stable state control module, the frequency and voltage of its power supply that can be exported to inverter are independently controlled and realize stabilization
Output；With
One synchronization module, it is capable of frequency, voltage and the phase angle of the power supply of adjusting module group output.
The cooperation of stable state control module and synchronization module can ensure what the module group of parallel connection was exported in grid-connected connection well
Frequency, voltage and the phase angle of power supply are synchronous, are easy to the grid-connected connection of module group.
In another schematical embodiment of shore electric power system, each module group also includes：One first switch, together
Rectifier, inverter, the first wave filter and first switch in one module group are sequentially connected in series；During system electrification, control unit
By the first switch being chosen to be in the module group of primary module group closure；
Each slave module group and primary module group synchronism output and grid-connected connection is specifically included：Slave module group passes through synchronous mould therein
Block adjusts frequency, power supply and the phase angle of the power supply of its output until same with the frequency of the power supply of primary module output, power supply and phase angle
Step, and by inverter therein to control unit send one it is grid-connected allow order, control unit receives grid-connected allow after order
First switch in control slave module group closes to realize the grid-connected connection with primary module group.The grid-connected attachment structure is simple.
In another schematical embodiment of shore electric power system, each module group also includes：
One first sensor, the power supply of module group output where it can detect it；With
One second sensor, it is capable of the power supply of detection primary module group output when being chosen as slave module group of module group where it；
In same slave module group, synchronization module compares the power supply of slave module group output and the power supply of primary module group output, and works as
The power supply of adjustment slave module group output is until main mould when the power supply of slave module group output and the asynchronous power supply of primary module group output
The line lock of block output.
Each slave module group realizes the power supply exported to it and main mould by the first sensor in it and second sensor respectively
The detection of the power supply of block group output, and then it is compared, adjusts and realize the synchronism output of the slave module group and primary module group,
Synchronous effect is good.
In another schematical embodiment of shore electric power system, shore electric power system includes a plurality of power supply groups, often
One power supply group includes：One first transformer, one second transformer, and be electrically connected between the first transformer and the second transformer
An at least module group.User according to demand of the actual loading to power, can select the quantity of grid-connected power supply group, improve
The flexibility of system.
In another schematical embodiment of shore electric power system, each module group also includes a second switch, same
Second switch, rectifier, inverter, the first wave filter and first switch series connection in module group；
Each power supply group also includes：One the 3rd switch and one the 4th switch, the 3rd switch, at least the first transformer, a module
Group, the second transformer and the 4th switch are sequentially connected in series.Second switch, the 3rd switch and the 4th switch can be in shore electric power systems
System disconnects when abnormal, improves security.
In another schematical embodiment of shore electric power system, each module group also includes：One second wave filter,
The second wave filter, rectifier, inverter and the first wave filter in same module group are sequentially connected in series.Second wave filter can be prevented
Only harmonic wave interference of the module group to industrial electrical network
Brief description of the drawings
Hereafter by clearly understandable mode by description of a preferred embodiment and with reference to accompanying drawing come to above-mentioned characteristic of the invention,
Technical characteristic, advantage and its implementation are further described, wherein：
Fig. 1 is a kind of structural representation of shore electric power system of prior art；
Fig. 2 is the structural representation for the shore electric power system that one embodiment of the present of invention is provided；
Fig. 3 is the structural representation for the shore electric power system that one embodiment of the present of invention is provided；
Fig. 4 is the structural representation for the shore electric power system that one embodiment of the present of invention is provided.
Label declaration：
11 external industrial power networks
12 rectifier transformers
13 frequency converters
131 rectifiers
132 inverters
14 sine wave filters
15 output transformers
16 ships
20 external electrical networks
21 rectifiers
22 inverters
221 stable state control modules
222 synchronization modules
23 first wave filters
24 control units
251 first sensors
252 second sensors
26 first switches
27 first transformers
28 second transformers
29 junction boxes
30 second switches
31 the 3rd switches
32 the 4th switches
G1 ..., Gn module groups
S1 ..., Sm power supply groups
Embodiment
In order to be more clearly understood to the technical characteristic of invention, purpose and effect, now control illustrates the tool of the present invention
Body embodiment, in the various figures identical label represent identical part.
Each figure discussed below and being used to the various embodiments of the principle of the disclosure in the patent file are described only with
The mode of explanation and the scope of the present disclosure is should not be construed as limiting anyway.It will be understood to those of skill in the art that
The principle of the disclosure can be implemented in any equipment suitably arranged.This Shen will be described with reference to exemplary non-limiting embodiments
Various innovative teachings please.
Herein, " schematic " expression " serving as example, example or explanation ", will should not be described herein as " showing
Any diagram, the embodiment of meaning property " are construed to a kind of preferred or more advantageous technical scheme.
To make only to schematically show part related to the present invention in simplified form, each figure, they do not represent its work
For the practical structures of product.In addition, so that simplified form is readily appreciated, there is the portion of identical structure or function in some figures
Part, schematically show only one of those, or only mark one of those.
Fig. 2 is the structural representation for the shore electric power system that one embodiment of the present of invention is provided.From figure 2 it can be seen that
The shore electric power system includes：
A plurality of module group G1 in parallel ..., Gn, each module group includes：The rectifier 21, one being sequentially connected in series is inverse
Become the wave filter 23 of device 22 and 1 first, and
One control unit 24, its can control each module group G1 ..., Gn realize grid-connected connection.
The quantity of module group is two or more, therefore n takes the integer more than or equal to 2.The shore electric power system can
External electrical network 20 (such as 50Hz) is converted into the power supply (such as 60Hz) that ship is used.In each module group, rectifier 21
The AC power (such as 690V, 50Hz) of the first frequency of input is changed into dc source to export to inverter 22, it is inverse
Become device 22 to export the PWM square wave powers (such as 690V, 60Hz) that the dc source is converted into second frequency to first
Wave filter 23, the first wave filter 23 the PWM square wave powers are converted into second frequency sine-wave power (such as 690V,
60Hz).The AC power of first frequency can be converted into the sine-wave power of second frequency by so each module group, realize
The conversion of frequency.A plurality of module group G1 ..., Gn is in parallel and grid-connected connection is realized under the control of control unit 24,
The capacity of shore electric power system can be improved.In addition, rectifier 21 and inverter 22 constitute a frequency converter in each module group.
The frequency converter of modules group is independent of one another, without general DC busbar；Quantity therefore, it is possible to module group in parallel is unrestricted
System, capacity (or power) scalability of the shore electric power system is good, and user can adaptively select simultaneously according to the actual requirements
The quantity of the module group of connection.In addition, the frequency converter of modules group is independently of one another, without general DC busbar, therefore plural number
Its capacity (or power) will not decline after individual module group is in parallel.Furthermore, the first wave filter is sine wave filter, Mei Yimo
Block group includes first wave filter, does not share a common sine wave filter, therefore each sine wave is filtered
The capacity of device need not be too big, it is to avoid to the demand of Large Copacity sine wave filter.Rectifier 21 in each module group
The frequency converter constituted with inverter 22 is easily matched with the first wave filter 23, and the clutter contained by the sine wave of output is few.One
In individual schematical embodiment, the frequency converter that rectifier 21 and inverter 22 are constituted in each module group is low-voltage variable frequency
Device, voltage is less than 1000V, and power is less than 1.5 megawatts.Now external electrical network 20 is exported to the first frequency of each module group
AC power high voltage power supply (such as 10KV) is obtained after decompression, the potential device not shown in Fig. 2.
So, the quantity of suitable in parallel module group is selected, the power of the shore electric power system is up to 12 megawatts, even more high,
Meet the demand to Large Copacity shore electric power system.In a schematical embodiment, first wave filter 23 is pure
Net power-supply filter, its influence of harmonic wave exported to load is small.In a schematical embodiment, rectifier 21
The S120 active front ends power module (Active Line Module) produced for Siemens Company.Inverter 22 is Siemens
The S120 active front end power modules of company's production.Rectifier 21 and inverter 22 in same module group are connected back-to-back.
S120 active front ends power module both has rectification function, has inversion function again, by two S120 active front end power supply moulds
Connection can realize the function of a frequency converter to block back-to-back.In a schematical embodiment, control unit 24 is
PLC (programmable logic controller (PLC)).
In a schematical embodiment, a plurality of grid-connected connections of module group in parallel are with one of module group
On the basis of (being referred to as primary module group)；Other module groups (being referred to as slave module group) on the basis of the primary module group, with
The primary module group carries out grid-connected connection.A plurality of module group G1 in parallel ..., in Gn which be primary module group, which is
Slave module group, be primarily to see which module group at first upper electricity and realize it is stable which is exported is exactly primary module group, other be exactly from
Module group.
In a schematical embodiment, shore electric power system as shown in Figure 2, a plurality of module group G1 in parallel ...,
Gn includes primary module group G1, and at least one slave module group G2 ..., Gn.At least one slave module group G2 ...,
Gn one by one or simultaneously with primary module group G1 synchronism outputs and grid-connected connection.Primary module group G1 is straight by hardwired mode
Connect and decide, user can not select other module groups to be primary module group.During system electrification, user need not be from a plurality of parallel connections
Module group G1 ..., Gn selection primary module groups, the primary module group G1 is by first upper electricity and realizes stable output.Should
A plurality of module group G1 in parallel ..., Gn by the packet of primary module group and slave module group, slave module group is with primary module group
On the basis of carry out grid-connected connection so that grid-connected connection is simple, effectively.
In a schematical embodiment, the inverter 22 in each slave module group includes：
One stable state control module 221, the frequency and voltage of its power supply that can be exported to inverter 22 are independently controlled and real
Now stablize output；With
One synchronization module 222, it can adjust frequency, voltage and the phase angle of the power supply of slave module group output.
Stable state control module 221 relieves frequency and the coupling of voltage for the power supply that the inverter 22 where it is exported, can
The frequency and voltage of the power supply exported to the inverter 22 where it are independently controlled, and complete voltage, frequency, phase angle
Tracking, and then ensure that the power supply of the output of the module group where it is stable.Stable state control module 221 is bent by steady-state characteristic
Line, dynamically by loading in other module groups for being assigned in power network to keep out-put supply stable operation.Synchronization module 222
It can be adjusted by frequency, voltage and the phase angle of the power supply exported to the inverter 22 where it, and then adjust its institute
Module group output power supply frequency, voltage and phase angle.Stable state control module 221 and synchronization module in inverter 22
222 cooperatings so that frequency of power supply of output of module group, voltage and phase angle are adjustable where it, and output is stable.
Any two module group in parallel is when carrying out grid-connected connection, therefore, to assure that frequency, voltage and the phase angle of the power supply of the two output
Synchronous, the cooperation of stable state control module 221 and synchronization module 222 can ensure the module group of parallel connection in grid-connected connection well
When the frequency of power supply, voltage and the phase angle that export it is synchronous, be easy to the grid-connected connection of module group.In a schematical embodiment party
In formula, the stable state control module 221 and synchronization module 222 are software module or hardware module or by software and hardware combining
Mode is realized.
During grid-connected, primary module group G1 first realizes stable output, then at least one slave module group G2 ..., Gn by
It is individual or simultaneously with primary module group G1 synchronism outputs and grid-connected connection.At least one slave module group G2 ..., appointing in Gn
Meaning one (by taking Gn as an example) and the process of primary module group G1 synchronism outputs and grid-connected connection are briefly described as follows：The slave module
Group stable state control module 221 and synchronization module 222 cooperating of the Gn by inverter 22 therein, by the slave module group
Frequency, voltage and the phase angle of the power supply of frequency, voltage and phase angle and primary module group the G1 output of the power supply of Gn output are carried out
Compare；If the frequency of the power supply of frequency, voltage and phase angle and primary module group the G1 output of the power supply of slave module group Gn output
Rate, voltage and phase angle are asynchronous, then adjust slave module group Gn output power supply frequency, voltage and phase angle until with
Frequency, voltage and the phase angle of the power supply of primary module group G1 outputs are synchronous；Then by the slave module group Gn and the primary module group
The grid-connected connections of G1.
In a schematical embodiment, each slave module group also includes：In one first switch 26, same slave module group
Rectifier 21, inverter 22, the first wave filter 23 and first switch 26 be sequentially connected in series.
Each slave module group and primary module group G1 synchronism outputs and grid-connected connection is specifically included：The slave module group (by taking Gn as an example)
Frequency, power supply and the phase angle of its power supply exported are adjusted by synchronization module 222 therein until being exported with primary module group G1
The frequency of power supply, power supply and phase angle it is synchronous, and a grid-connected permission is sent to control unit 24 by inverter 22 therein
Order, control unit 24 receive it is grid-connected allow to control the first switch 26 in slave module group Gn to close after order with realize with
Primary module group G1 grid-connected connection.In the embodiment, primary module group determine all the time it is constant, slave module group one by one or simultaneously with
The primary module group realizes grid-connected connection.In each slave module group after electricity, do not have at the beginning and the grid-connected connection of primary module group, only
Have after the line lock of output of the power supply and the primary module group that adjust the output of its own, just by by the in the slave module group
One switch closure realizes the grid-connected connection with primary module group.The grid-connected attachment structure is simple.
In a schematical embodiment, each slave module group also includes：
One first sensor 251, the power supply of slave module group output where it can detect it；With
One second sensor 252, it can detect the power supply of primary module group G1 outputs；
In same slave module group (by taking Gn as an example), the power supply (tool of slave module group Gn outputs where synchronization module 222 compares it
Body includes frequency, voltage and the phase angle of the power supply) and primary module group G1 output power supply (specifically include the power supply frequency,
Voltage and phase angle), and when slave module group Gn export power supply (frequency, voltage and the phase angle that specifically include the power supply) and
The power supply (frequency, voltage and the phase angle that specifically include the power supply) of primary module group G1 outputs adjusts slave module group when asynchronous
The power supply (frequency, voltage and the phase angle that specifically include the power supply) of Gn outputs is until the power supply (tool exported with primary module group G1
Body includes frequency, voltage and the phase angle of the power supply) it is synchronous.Each slave module group passes through the first sensor 251 in it respectively
The detection of the power supply and the primary module group G1 power supplys exported that are exported to it is realized with second sensor 252, and then be compared,
The synchronism output of the slave module group and primary module group is adjusted and realizes, synchronous effect is good.
In a schematical embodiment, shore electric power system as shown in Figure 3, a plurality of module groups in parallel
G1 ..., one (by taking G1 as an example) in Gn be chosen to be primary module group, remaining described module group G2 ..., Gn
It is chosen to be slave module group；The slave module group G2 ..., Gn one by one or simultaneously with primary module group (G1) synchronism output
And grid-connected connection.Before upper electricity, primary module group G1 is not determined directly, a plurality of module group G1 in parallel ...,
Each module group in Gn is par.User in use, a plurality of module group G1 in parallel ...,
One in Gn is chosen to be primary module group, and remaining module group is chosen to be slave module group.So, the shore electric power system energy
It is enough neatly using a plurality of module group G1 in parallel ..., in Gn any one module group selection be used as primary module group, system
Flexibility it is good.
In a schematical embodiment, each inverter 22 includes：
One stable state control module 221, the frequency and voltage of its power supply that can be exported to inverter 22 are independently controlled and real
Now stablize output；With
One synchronization module 222, it can adjust frequency, voltage and the phase angle of the power supply of module group output.That is,
Whether the inverter in the inverter or slave module group in primary module group all has identical structure.
Stable state control module 221 relieves frequency and the coupling of voltage for the power supply that the inverter 22 where it is exported, can
Frequency and voltage are independently controlled, voltage, frequency, the tracking of phase angle is completed, and then the module group where ensuring it is defeated
The power supply gone out is stable.Load is dynamically assigned in power network by stable state control module 221 by steady-state characteristic curve
To keep out-put supply stable operation in other module groups.Synchronization module 222 can be by defeated to the inverter 22 where it
Frequency, voltage and the phase angle of the power supply gone out are adjusted, and then adjust the frequency of the power supply of the output of the module group where it, electricity
Pressure and phase angle.Stable state control module 221 and the cooperating of synchronization module 222 in inverter 22 so that module group where it
The frequency of power supply of output, voltage and phase angle it is adjustable, and output is stable.Any two module group in parallel is grid-connected in progress
During connection, therefore, to assure that frequency, voltage and the phase angle of the power supply of the two output are synchronous, stable state control module 221 and synchronous mould
The cooperation of block 222 can ensure frequency, voltage and the phase angle of the power supply that the module group of parallel connection is exported in grid-connected connection well
It is synchronous, it is easy to the grid-connected connection of module group.In a schematical embodiment, the stable state control module 221 and synchronization
Module 222 is software module or hardware module or realized by way of software and hardware combining.
After primary module group and slave module group are selected good, shore electric power system shown in Fig. 3 and network process and bank electricity shown in Fig. 2
Power-supply system and network process is identical.During grid-connected, primary module group G1 first realizes stable output, then the slave module group
G2 ..., Gn one by one or simultaneously with primary module group G1 synchronism outputs and grid-connected connection.Slave module group G2 ..., Gn
In any one (by taking Gn as an example) and primary module group G1 synchronism outputs and grid-connected connection process be briefly described as follows：Should
Slave module group Gn by the stable state control module 221 and the cooperating of synchronization module 222 of inverter 22 therein, by this from
Frequency, voltage and the phase of frequency, voltage and the phase angle of the power supply of module group Gn output and the primary module group G1 power supplys exported
Angle is compared；If the electricity of frequency, voltage and phase angle and primary module group the G1 output of the power supply of slave module group Gn output
The frequency in source, voltage and phase angle are asynchronous, then adjust frequency, voltage and the phase angle of the power supply of slave module group Gn output
Until synchronous with the frequency of the primary module group G1 power supplys exported, voltage and phase angle；Then by the slave module group Gn and the main mould
The grid-connected connections of block group G1.
In a schematical embodiment, each module group also includes：It is whole in one first switch 26, same module group
Stream device 21, inverter 22, the first wave filter 23 and first switch 26 are sequentially connected in series.During system electrification, control unit 24
The first switch 26 being chosen to be in the module group (by taking G1 as an example) of primary module group is closed, and in all slave module groups
First switch 26 disconnects.For another angle, a plurality of module group G1 in parallel ..., first switch 26 in Gn
The module group of one closure is primary module group.
After primary module group and selected good slave module group, each slave module group and primary module group G1 synchronism outputs and grid-connected connection
Process it is identical with embodiment illustrated in fig. 2, specifically include：Slave module group (by taking Gn as an example) passes through synchronization module therein
Frequency, power supply and the phase angle of the power supply of 222 adjustment its output until exported with primary module group G1 the frequency of power supply, power supply and
Phase angle is synchronous, and by inverter 22 therein to control unit 24 send one it is grid-connected allow order, control unit 24 connects
The grid-connected first switch 26 allowed after order in control slave module group Gn is received to close to realize the grid-connected company with primary module group G1
Connect.In the embodiment, first from a plurality of module group G1 in parallel ..., selection one is as primary module group in Gn, then
Slave module group realizes grid-connected connection with the primary module group one by one or simultaneously.In each slave module group after electricity, at the beginning not and
The grid-connected connection (i.e. the first switch 26 of slave module group disconnects) of primary module group, only adjusts power supply and the master of the output of its own
After the line lock of the output of module group, just by the way that first switch therein is closed into the grid-connected connection realized with primary module group.
The grid-connected attachment structure is simple.
In a schematical embodiment, each module group also includes：
One first sensor 251, the power supply of slave module group output where it can detect it；With
One second sensor 252, it is capable of the electricity of detection primary module group output when being chosen as slave module group of module group where it
Source；
In same slave module group (by taking Gn as an example), synchronization module 222 compares the power supply of the module group Gn outputs where it
The power supply of (frequency, voltage and the phase angle that specifically include the power supply) and primary module group G1 output (specifically includes the power supply
Frequency, voltage and phase angle), and when the slave module group Gn power supplys exported (specifically include frequency, voltage and the phase of the power supply
Angle) and primary module group G1 output power supply (frequency, voltage and the phase angle that specifically include the power supply) it is asynchronous when adjustment from
Module group Gn output power supply (frequency, voltage and the phase angle that specifically include the power supply) until with primary module group G1 export
Power supply (frequency, voltage and the phase angle that specifically include the power supply) is synchronous.Each slave module group is passed by first in it respectively
Sensor 251 and second sensor 252 realize the detection of the power supply and the primary module group G1 power supplys exported that are exported to it, and then
The synchronism output of the slave module group and primary module group is compared, adjusts and realize, synchronous effect is good.
It should be noted that due to a plurality of module group G1 in parallel ..., any one in Gn be possible to it is selected based on
Module group or slave module group.Therefore all module groups include first sensor 251 and second sensor 252, the two difference
The two ends of the first switch 26 for the module group being electrically connected to where it.
Fig. 4 is the structural representation for the shore electric power system that one embodiment of the present of invention is provided.It is identical with Fig. 2 and Fig. 3
It is no longer repeated for part.Figure 4, it is seen that shore electric power system include a plurality of power supply group S1 ..., Sm, m
For the integer more than or equal to 2.Each power supply group includes：One first transformer 27, one second transformer 28, and electrical connection
An at least module group between the first transformer 27 and the second transformer 28.Each power supply group S1 ..., include in Sm
The quantity of module group can be with identical, can also be different.Be tod from another angle, a plurality of module group G1 in parallel ...,
Gn is divided into m groups, with m power supply group S1 ..., Sm correspond.Each power supply group includes one group of module group, every group
Module group is made up of an at least module group.User can select grid-connected power supply group according to demand of the actual loading to power
Quantity, improve system flexibility.
In a schematical embodiment, shore electric power system includes a power supply group.The power supply group includes：One first becomes
Depressor 27, one second transformer 28, and be electrically connected between the first transformer 27 and the second transformer 28 it is a plurality of simultaneously
The module group G1 of connection ..., Gn.In the embodiment, a plurality of module group G1 in parallel ..., Gn be not divided into it is many
Group, all module group G1 ..., Gn two ends be respectively connected to the first transformer 27 and the second transformer 28.With Fig. 4
Shown embodiment is compared, situation of the embodiment equivalent to m=1.
In same power supply group, the first transformer 27 by industrial electrical network 20 (such as 10KV, 50Hz) be depressured (such as 690V,
50Hz), it is also known as step-down transformer.Then, an at least module group by after decompression power supply carry out frequency conversion (such as 690V,
Grid-connected output after 60Hz).Afterwards, the second transformer 28 is boosted (such as 6.6KV, 60Hz) to the power supply after frequency conversion,
Also known as step-up transformer.In addition, the second transformer 28 also has buffer action, by shore electric power system and laod network
Isolated, also known as isolating transformer.Power supply group S1 ..., Sm isolating transformer it is in parallel after export.So, it is multiple
Several module group G1 in parallel ..., frequency converter (rectifier 21 and inverter 22 are connected and composed back-to-back) work in Gn
Make under low pressure (being, for example, less than 1000V), reduce the requirement to frequency converter.Finally, the second transformer 28 will boosting and
Power supply after frequency conversion is exported to junction box 29, is used for ship.
In a schematical embodiment, each module group also includes second in a second switch 30, same module group
Switch 30, rectifier 21, inverter 22, the first wave filter 23 and first switch 26 are connected.Each power supply group also includes：
One the 3rd switch 31 and one the 4th switch 32, the 3rd the 31, first transformer 27 of switch, an at least module group, second become
The switch of depressor 28 and the 4th 32 is sequentially connected in series.The switch 32 of the switch of second switch the 30, the 3rd 31 and the 4th can be in bank electricity electricity
Disconnected during the system exception of source, improve security.User can be bypassed abnormal module group by second switch 30,
Improve the fault-tolerance of shore electric power system.In a schematical embodiment, first switch 26, second switch 30,
3rd switch 31 and the 4th switch 32 are breaker.
In a schematical embodiment, each module group also includes：In one second wave filter 33, same module group
Second wave filter 33, rectifier 21, the wave filter 23 of inverter 22 and first are sequentially connected in series.In a schematical implementation
In mode, the second wave filter 33 is pure power supply wave filter, while being also sine wave filter, it can prevent module
Harmonic wave interference of the group to industrial electrical network (such as 10KV, 50Hz).
The process of shore electric power system grid connection connection is illustrated with reference to Fig. 4.
1, select primary module group and slave module group
First selected before shore electric power system electrification power supply group S1 ..., Sm master slave relation, in main power source group during system electrification
A plurality of parallel connections are determined according to prioritization logic set in advance in control unit 24 in (the power supply group for including primary module group)
Module group G1 ..., the module group in Gn be primary module group (such as G1), other module groups are all slave module group.
2, shore electric power system starts
After the beginning is established by cable in the startup of shore electric power system, all second switches 30, the switch 32 of all 3rd switches 31 and the 4th
Close a floodgate, allow all rectifiers 21 and inverter 22 all to complete electricity；
3, primary module group starts
After primary module group G1 output rated frequencies, the first switch 26 in the control primary module group of control unit 24 G1 is closed a floodgate,
Primary module group G1 (is not drawn into) booster tension according to the ramp generator defined in figure, make all phases of second transformer 28
After completing pre-magnetizing, progressively boosting causes rated output voltage, and the final output for causing primary module group G1 is stable in rated voltage
With rated frequency (such as 60Hz).
4, slave module group start and with the grid-connected connection of primary module group
Other slave module groups one by one or simultaneously output rated voltage, rated frequency；Then start to carry out together with primary module group G1
Step, adjusts voltage, frequency, the phase angle of the slave module group output just started, when the locking for completing voltage, frequency, phase angle
Afterwards, the slave module group newly started is sent and primary module group G1 is grid-connected allows order, and the new startup is allowed by control unit 24
First switch 26 in slave module group is closed a floodgate, and is realized and the grid-connected connections of primary module group G1.The like, it is one by one or simultaneously complete
Into the grid-connected connection of remaining slave module group, the synchronism output of a plurality of module groups is finally realized.
It should be understood that, although this specification is described according to each embodiment, but not each embodiment only includes one
Individual independent technical scheme, only for clarity, those skilled in the art will should illustrate this narrating mode of specification
Book is as an entirety, and the technical scheme in each embodiment may also be suitably combined to form those skilled in the art can be with
The other embodiment of understanding.
The a series of detailed description of those listed above illustrating only for the possible embodiments of the present invention, they
And be not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or change all should
Within protection scope of the present invention.
Claims (12)
1. shore electric power system, including：
A plurality of module groups in parallel (G1 ..., Gn), each module group includes：It is the rectifier (21) that is sequentially connected in series, one inverse
Become device (22) and one first wave filter (23), and
One control unit (24), it can control each module group to realize grid-connected connection.
2. shore electric power system according to claim 1, it is characterised in that a plurality of module groups in parallel (G1 ...,
Gn primary module group (G1)) is included, and at least one slave module group (G2 ..., Gn)；At least one slave module group (G2 ...,
Gn) one by one or simultaneously with primary module group (G1) synchronism output and grid-connected connection.
3. shore electric power system according to claim 2, it is characterised in that the inverter (22) in each slave module group
Including：
One stable state control module (221), the frequency and voltage of its power supply that can be exported to the inverter (22) are independently controlled and real
Now stablize output；With
One synchronization module (222), it can adjust frequency, voltage and the phase angle of the power supply of the slave module group output.
4. shore electric power system according to claim 3, it is characterised in that each slave module group also includes：One first opens
Close (26), the rectifier (21), the inverter (22), first wave filter (23) and institute in the same slave module group
First switch (26) is stated to be sequentially connected in series；
Each slave module group and primary module group (G1) synchronism output and grid-connected connection is specifically included：The slave module group passes through it
In the synchronization module (222) adjust its output power supply frequency, power supply and phase angle until with the primary module group (G1) export
The frequency of power supply, power supply and phase angle it is synchronous, and sent in the lump to described control unit (24) by the inverter (22) therein
Net allows order, and described control unit (24), which is received, described grid-connected allows to control described first in the slave module group to open after order
(26) closure is closed to realize the grid-connected connection with the primary module group (G1).
5. shore electric power system according to claim 3, it is characterised in that each slave module group also includes：
One first sensor (251), the power supply of slave module group output where it can detect it；With
One second sensor (252), it can detect the power supply of primary module group (G1) output；
In the same slave module group, the power supply and the primary module group (G1) of the relatively more described slave module group output of the synchronization module (222)
The power supply of output, and adjusted when the power supply for power supply and the primary module group (G1) output that the slave module group is exported is asynchronous
The power supply of the slave module group output is until the line lock that the primary module group (G1) exports.
6. shore electric power system according to claim 1, it is characterised in that a plurality of module groups in parallel (G1 ...,
Gn one in) is chosen to be primary module group (G1), and remaining described module group is chosen to be slave module group (G2 ..., Gn)；It is described
Slave module group (G2 ..., Gn) one by one or simultaneously with primary module group (G1) synchronism output and grid-connected connection.
7. shore electric power system according to claim 6, it is characterised in that each inverter (22) includes：
One stable state control module (221), the frequency and voltage of its power supply that can be exported to the inverter (22) are independently controlled and real
Now stablize output；With
One synchronization module (222), it can adjust frequency, voltage and the phase angle of the power supply of the module group output.
8. shore electric power system according to claim 7, it is characterised in that each module group also includes：One first switch
(26) rectifier (21), the inverter (22), first wave filter (23) and described, in the same module group
One switch (26) is sequentially connected in series；During system electrification, described control unit (24) will be chosen to be in the module group of primary module group
First switch (26) closure；
Each slave module group and primary module group (G1) synchronism output and grid-connected connection is specifically included：The slave module group passes through it
In the synchronization module (222) adjust its output power supply frequency, power supply and phase angle until with the primary module group (G1) export
The frequency of power supply, power supply and phase angle it is synchronous, and sent in the lump to described control unit (24) by the inverter (22) therein
Net allows order, and described control unit (24), which is received, described grid-connected allows to control described first in the slave module group to open after order
(26) closure is closed to realize the grid-connected connection with the primary module group (G1).
9. shore electric power system according to claim 7, it is characterised in that each module group also includes：
One first sensor (251), the power supply of module group output where it can detect it；With
One second sensor (252), its can module group where it be chosen as detecting the power supply of the primary module group output during slave module group；
In the same slave module group, the power supply and the primary module group (G1) of the relatively more described slave module group output of the synchronization module (222)
The power supply of output, and adjusted when the power supply for power supply and the primary module group (G1) output that the slave module group is exported is asynchronous
The power supply of the slave module group output is until the line lock that the primary module group (G1) exports.
10. shore electric power system according to claim 1, it is characterised in that the shore electric power system includes a plurality of power supplys
Group (S1 ..., Sm), each power supply group includes：One first transformer (27), one second transformer (28), and be electrically connected to
Module group at least described in one between first transformer (27) and second transformer (28).
11. shore electric power system according to claim 10, it is characterised in that
Each module group also includes the second switch (30), the rectifier in a second switch (30), the same module group
(21), the inverter (22), first wave filter (23) and the first switch (26) series connection；
Each power supply group also includes：One the 3rd switch (31) and one the 4th switch (32), the 3rd switch (31), described first become
Depressor (27), the module group at least described in one, second transformer (28) and the 4th switch (32) are sequentially connected in series.
12. shore electric power system according to claim 10, it is characterised in that each module group also includes：One second filter
Second wave filter (33), the rectifier (21), the inverter (22) and institute in ripple device (33), the same module group
The first wave filter (23) is stated to be sequentially connected in series.
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| CN201610187293.8A CN107240915B (en) | 2016-03-29 | 2016-03-29 | Shore electric power system |
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|---|---|---|---|
| CN201610187293.8A CN107240915B (en) | 2016-03-29 | 2016-03-29 | Shore electric power system |
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| CN109103860A (en) * | 2018-11-01 | 2018-12-28 | 广州供电局有限公司 | Marine transformer preliminary filling magnetism method based on concatenation small capacity transformer |
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| US11680474B2 (en) | 2019-06-13 | 2023-06-20 | Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. | Fracturing apparatus and control method thereof, fracturing system |
| US11746636B2 (en) | 2019-10-30 | 2023-09-05 | Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. | Fracturing apparatus and control method thereof, fracturing system |
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