CN107732909A - Impedance network, static passive compensation device, PWM rectifier and relative control apparatus - Google Patents
Impedance network, static passive compensation device, PWM rectifier and relative control apparatus Download PDFInfo
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- CN107732909A CN107732909A CN201711165114.1A CN201711165114A CN107732909A CN 107732909 A CN107732909 A CN 107732909A CN 201711165114 A CN201711165114 A CN 201711165114A CN 107732909 A CN107732909 A CN 107732909A
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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
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
Impedance network provided by the invention, static passive compensation device, PWM rectifier and relative control apparatus, pass through 4 inductance and 6 switch one adjustable impedance networks of impedance value of composition, the impedance value of impedance network can be adjusted in the case of different switch opening and closings, the scope of adjustment is from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, compared with using the situation of the less inductance of inductance value in SVC in correlation technique, it can be exported in power network under low current operating mode, increase the impedance value of impedance network, in the case where power network output voltage is certain, the impedance value of power network access is bigger, so the electric current of power network output is with regard to smaller, so as to improve the control accuracy of electric current under power network low current operating mode, meet power grid control demand.
Description
Technical field
The present invention relates to electronic circuit technology field, is filled in particular to a kind of impedance network, static reactive
Put, PWM rectifier and relative control apparatus.
Background technology
At present, with the increase of power demand, power network all can dilatation by stages, built by separate periods simultaneously comes into operation in batches.In electricity
Net come into operation before test phase and operation phase in, in many testing results equipment and equipment in use (such as：Static reacance
Compensator, PWM rectifier) in, it is necessary to use the impedance resistance-inductance of series connection (resistance or inductance or) of different size, come pair
Electric current in network operation is adjusted.
The inductance of fixed inductance value is provided with correlation technique, in SVC, for producing impedance to undertake
Difference in power network caused by electronic power switch between PWM voltage waveforms and power network sinusoidal voltage waveform.For built by separate periods
Generating field, when downpayment set grid-connection generates electricity, it is necessary under SVC operates in low current operating mode, with later stage wind
Group of motors is installed in place successively, when having multiple units to generate electricity by way of merging two or more grid systems together in power network, it is necessary to which SVC operates in
Under bigger electric current operating mode.The less inductance of inductance value will be so used in SVC, to meet that power network is complete
The requirement of output current in during network operation.
In process of the present invention is realized, inventor has found that at least there are the following problems in the prior art：
The less inductance of inductance value is used in SVC, in the case where power network exports low current operating mode, can be caused
Current control accuracy is relatively low, can not meet power grid control demand.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of impedance network, static passive compensation device, PWM
Rectifier and relative control apparatus, under exporting low current operating mode in power network, ensure current control accuracy.
In a first aspect, the embodiments of the invention provide a kind of impedance network, including：First inductance, the second inductance, the 3rd electricity
Sense, the 4th inductance, first switch, second switch, third switch, the 4th switch, the 5th switch and the 6th switch；
The impedance network includes：First output end and the second output end；
The first end of first inductance respectively with the first end of the first switch and the first end of the second switch
Connection, form first output end of the impedance network；Second end of first inductance respectively with the 3rd switch the
Two ends connect with the first end of the second inductance；
Second end of the first end of second inductance also with the 3rd switch is connected；The second end difference of second inductance
Second end of first end, the second switch with the 3rd inductance and the second end of the 4th switch are connected；
The first end of 3rd inductance also respectively with the second end of the second switch and the 4th switch the second end
Connection；Second end of the 3rd inductance is connected with the first end of the 4th inductance and the second end of the 5th switch respectively；
Second end of the first end of 4th inductance also with the 5th switch is connected, the second end difference of the 4th inductance
It is connected with the second end of first switch and the 6th the second end switched；
The first end with the 4th switch, the first end of the 5th switch and the 6th open the first end of 3rd switch respectively
The first end connection of pass, form second output end of the impedance network.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the first of first aspect, wherein：Also
Including：Anti- short block；
The anti-short block, it is connected with first output end of the impedance network or second output end.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of second of first aspect, wherein：Institute
Stating anti-short block includes：Resistance and/or inductance.
Second aspect, the embodiment of the present invention provide a kind of control device, and each switch with above-mentioned impedance network connects respectively
Connect；
The control device, for by changing the open and-shut mode respectively switched in the impedance network, to the impedance net
The impedance value of network is adjusted.
With reference to second aspect, the embodiments of the invention provide the possible embodiment of the first of second aspect, wherein：Institute
Control device is stated, including：
First acquisition module, for obtaining duty parameter, the duty parameter includes：Working current value or maximum functional
Reactive power value；
Computing module, for according to the duty parameter got, calculating impedance value to be changed；
Second acquisition module, for the mapping table for obtaining default impedance value with switching open and-shut mode；
Determining module, for determining impedance value to be changed from mapping table of the impedance value with switch open and-shut mode
Corresponding switch open and-shut mode；
Switch opening and closing module, for according to the switch open and-shut mode determined, the switch that should be disconnected into each switch to be sent
Open command, and the switch that should be closed into each switch sends close command, so as to be carried out to the impedance value of the impedance network
Adjustment.
The third aspect, the embodiment of the present invention provide a kind of static passive compensation device, including：Grid side switch, the first work(
Rate unit group and above-mentioned impedance network；
Grid side switch, the impedance network and the first power cell group are sequentially connected.
With reference to the third aspect, the embodiments of the invention provide the possible embodiment of the first of the third aspect, wherein：Institute
State the first power cell group and use voltage source inverter.
Fourth aspect, the embodiment of the present invention provide a kind of PWM rectifier, including：Grid side switch, the second power cell
Group, inversion unit and above-mentioned impedance network；
Grid side switch, the impedance network, the second power cell group and the inversion unit are sequentially connected.
5th aspect, the embodiment of the present invention provide a kind of PWM rectifier, including：Grid side switch, capacitor type filtering net
Network, the 3rd power cell group, above-mentioned the first impedance network and the second impedance network；
The grid side switch, first impedance network, second impedance network and the 3rd power cell group
It is sequentially connected；
The capacitor type filter network is connected between first impedance network and second impedance network.
In terms of the 5th, the embodiments of the invention provide the first possible embodiment of the 5th aspect, wherein：Institute
Stating capacitor type filter network includes multigroup filter capacitor unit, each group filter capacitor unit in multigroup filter capacitor unit
It is connected in parallel respectively between first impedance network and second impedance network；
The filter capacitor unit, including：Switching switch and filter capacitor；The first end of the switching switch and the filter
Ripple capacitance connection；Bus between second end of the switching switch and first impedance network and second impedance network
Connection.
Impedance network, static passive compensation device, PWM rectifier and relative control apparatus provided in an embodiment of the present invention,
, can be in the case of different switch opening and closings by 4 inductance and 6 switch one adjustable impedance networks of impedance value of composition
The impedance value of impedance network is adjusted, for the scope of adjustment from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, with
Situation in correlation technique using the less inductance of inductance value in SVC is compared, and can export small electricity in power network
Flow under operating mode, increase the impedance value of impedance network, in the case where power network output voltage is certain, the impedance value of power network access is got over
Greatly, then the electric current of power network output, so as to improve the control accuracy of electric current under power network low current operating mode, meets power network with regard to smaller
Demand for control.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows a kind of structural representation for impedance network that the embodiment of the present invention 1 is provided；
Fig. 2 shown in the impedance network that the embodiment of the present invention 1 is provided, the control device being controlled to impedance network
Concrete structure schematic diagram；
Fig. 3 shows a kind of structural representation for static passive compensation device that the embodiment of the present invention 2 is provided；
Fig. 4 shows a kind of structural representation for PWM rectifier that the embodiment of the present invention 3 is provided；
Fig. 5 shows the structural representation for another PWM rectifier that the embodiment of the present invention 4 is provided.
Icon：The inductance of Z1- first；The inductance of Z2- second；The inductance of Z3- the 3rd；The inductance of Z4- the 4th；S1- first switches；S2-
Second switch；S3- the 3rd is switched；S4- the 4th is switched；S5- the 5th is switched；S6- the 6th is switched；200- control devices；201- is deposited
Reservoir；202- processors；203- mixed-media network modules mixed-medias；221- operating systems；222- service modules；300- grid sides switch；302-
One power cell group；304- impedance networks；400- grid sides switch；402- the second power cell groups；404 inversion units；406-
Impedance network；500- grid sides switch；502- capacitor type filter networks；The power cell groups of 504- the 3rd；506- the first impedance nets
Network；The impedance networks of 508- second；5020- filter capacitors；5022- switching switches.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Middle accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
It is part of the embodiment of the present invention, rather than whole embodiments.The present invention being generally described and illustrated herein in the accompanying drawings is real
Applying the component of example can be configured to arrange and design with a variety of.Therefore, it is of the invention to what is provided in the accompanying drawings below
The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of the selected reality of the present invention
Apply example.Based on embodiments of the invention, institute that those skilled in the art are obtained on the premise of creative work is not made
There is other embodiment, belong to the scope of protection of the invention.
At present, the inductance of fixed inductance value is provided with SVC, for producing impedance to undertake in power network
Difference caused by electronic power switch between PWM voltage waveforms and power network sinusoidal voltage waveform.Generating for built by separate periods
, when downpayment set grid-connection generates electricity, it is necessary under SVC operates in low current operating mode, with later stage Wind turbines
It is installed in place successively, when there are multiple units to generate electricity by way of merging two or more grid systems together in power network, it is necessary to which SVC operates in bigger
Under electric current operating mode.The less inductance of inductance value will be so used in SVC, to meet that power network the whole network is run
When in output current requirement.The less inductance of inductance value is used in SVC, low current work is exported in power network
Under condition, current control accuracy can be caused relatively low, power grid control demand can not be met.Based on this, a kind of impedance of the application offer
Network, static passive compensation device, PWM rectifier and relative control apparatus.
It should be noted that in the description of the invention, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In addition, in the description of the invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " company
Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
Concrete meaning.
Inductance, electric capacity, switch, it is single-phase inductance, single-phase for monophase system in the following embodiment of the application
Electric capacity and single-phase switch；It is three pole reactor, three phase capacitance and threephase switch for three-phase system；For multiphase system,
Switched for more phase inductances, multiphase electric capacity and multiphase.
Above-mentioned switch, can be contactor, disconnecting switch, on-load switch, breaker or electronic power switch.
Embodiment 1
Impedance network schematic diagram shown in Figure 1, the present embodiment propose a kind of impedance network, including：First inductance Z1,
Second inductance Z2, the 3rd inductance Z3, the 4th inductance Z4, first switch S1, second switch S2, the 3rd switch S3, the 4th switch S4,
5th switch S5 and the 6th switch S6.
Above-mentioned impedance network includes：First output end and the second output end.
Each inductance and the specific annexation respectively switched are as follows above：
Above-mentioned first inductance Z1 first end respectively with above-mentioned first switch S1 first end and above-mentioned second switch S2
First end connects, and forms above-mentioned first output end of above-mentioned impedance network；Above-mentioned first inductance Z1 the second end is respectively with the 3rd
Switch S3 the second end connects with the second inductance Z2 first end.
Second end of the above-mentioned second inductance Z2 first end also with the 3rd switch S3 is connected；The second of above-mentioned second inductance Z2
The second end of the first end with above-mentioned 3rd inductance Z3, above-mentioned second switch S2 the second end and the 4th switch S4 respectively is held to connect
Connect；
Above-mentioned 3rd inductance Z3 first end also switchs S4's with above-mentioned second switch S2 the second end and the 4th respectively
Second end connects；Above-mentioned 3rd inductance Z3 the second end respectively with the 4th inductance Z4 first end and above-mentioned 5th switch S5 the
Two ends connect；
Second end of the above-mentioned 4th inductance Z4 first end also with the 5th switch S5 is connected, and the second of above-mentioned 4th inductance Z4
Second end of the end respectively with first switch S1 the second end and the 6th switch S6 is connected；
It is above-mentioned 3rd switch S3 first end respectively with the 4th switch S4 first end, the 5th switch S5 first end and
6th switch S6 first end connection, form above-mentioned second output end of above-mentioned impedance network.
In above-mentioned impedance network, from figure 1 it appears that each inductance is respectively provided with two connection ends, first end refers to respectively
With respect to connection end upward in inductance, the second end refers to connection end relatively directed downwardly in inductance.Each switch also has two respectively
Connection end, end where moving contact are first end, and end where static contact is the second end.
In one embodiment, the first inductance Z1, the second inductance Z2, the 3rd inductance Z3 and the 4th inductance Z4 electricity
Inductance value is identical.
Above-mentioned each inductance and each switch, can be respectively adopted any in the prior art can realize what the present embodiment proposed
The inductor and electronic switch of impedance network, are no longer repeated one by one here.
In summary, the impedance network that the present embodiment provides, can by 4 inductance and 6 switch one impedance values of composition
The impedance network of adjustment, the impedance value of impedance network can be adjusted in the case of different switch opening and closings, the model of adjustment
Enclose from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, with using electricity in correlation technique in SVC
The situation of the less inductance of inductance value is compared, and in the case where power network exports low current operating mode, can increase the impedance value of impedance network, in electricity
In the case that net output voltage is certain, the impedance value of power network access is bigger, then the electric current of power network output is with regard to smaller, so as in electricity
The control accuracy of electric current is improved under net low current operating mode, meets power grid control demand.
From figure 1 it appears that when second switch S2 and the 4th is switched, S4 is closed at or first switch S1 and the 4th is opened
When pass S6 is closed at, impedance network can be made short-circuit, cause equipment in power network to lose, so, in order to avoid impedance network occurs
The situation of short circuit, the impedance network that the present embodiment proposes, in addition to：Anti- short block；
Above-mentioned anti-short block, it is connected with above-mentioned first output end of above-mentioned impedance network or above-mentioned second output end.
It is and above-mentioned after being connected in one end of above-mentioned anti-short block with above-mentioned first output end or above-mentioned second output end
The output end of anti-short block connection is no longer the output end of above-mentioned impedance network, and the other end of above-mentioned anti-short block substitutes
The above-mentioned output end being connected with anti-short block, turn into the output end of above-mentioned impedance network.
In one embodiment, above-mentioned anti-short block includes：Resistance and/or inductance.
Description more than can be seen that sets anti-short block in impedance network, when second switch and the 4th are opened
Pass is closed at or first switch and the 4th switch still have electrical appliance when being closed in impedance network, avoids impedance
The appearance of network short situation, the equipment in power network is played a protective role.
, can be by the opening and closing shape that is switched in manual change's impedance network when needing to adjust the impedance value of impedance network
State, but the efficiency comparison of the open and-shut mode of manual change's switch is low, and may be opened during on-off switch
Mistake is closed, causes the impedance value of the impedance value after adjustment and actual demand inconsistent, causes unnecessary loss.So can be with
Impedance network is connected on control device, the impedance value of impedance network is adjusted by control device.In order to this reality
The impedance value of impedance network for applying example proposition is adjusted, and the present embodiment proposes a kind of control device, respectively with above-mentioned impedance
Each switch connection in network.
Above-mentioned control device, for by changing the open and-shut mode respectively switched in above-mentioned impedance network, to above-mentioned impedance net
The impedance value of network is adjusted.
Fig. 2 shows a kind of structured flowchart for the control device that can be applied in the present embodiment.As shown in Fig. 2 control dress
Putting 200 includes：Memory 201, processor 202 and mixed-media network modules mixed-media 203.Wherein, processor 202 respectively with memory 201 and
Mixed-media network modules mixed-media 203 connects.
Memory 201 can be used for storage software program and module, as the switch open and-shut mode in the present embodiment adjusts journey
Sequence instruction/module, processor 202 is stored in software program and module in memory 201 by operation, various so as to perform
Application of function and data processing, that is, realize the function of the switch open and-shut mode adjustment programme instruction/module.Memory 201 can
Including high speed random access memory, may also include nonvolatile memory, as one or more magnetic storage device, flash memory or
Other non-volatile solid state memories of person.Further, above-mentioned software program and module may also include：Operating system 221 with
And service module 222.Wherein operating system 221, such as can be LINUX, UNIX, WINDOWS, it may include various for managing
The component software of system task (such as memory management, storage device control, power management etc.) and/or driving, and can with it is various
Hardware or component software mutually communicate, so as to provide the running environment of other software component.Service module 222 operates in operation system
On the basis of system 221, and monitored come the request of automatic network, completed according to request corresponding by the network service of operating system 221
Data processing, and return to result to client.That is, service module 222 is used to provide network clothes to client
Business.
Mixed-media network modules mixed-media 203 is used to receiving and sending network signal.Above-mentioned network signal may include wireless signal or have
Line signal.
In the present embodiment, control device 200 also includes the man-machine interface (not shown in Fig. 2) being connected with processor 202,
The impedance value for alloing network operation personnel to control control device 200 to adjust impedance network by man-machine interface.
It is appreciated that structure shown in Fig. 2 is only to illustrate, control device 200 may also include it is more more than shown in Fig. 2 or
Less component, or there is the configuration different from shown in Fig. 2.Each component shown in Fig. 2 can use hardware, software or its
Combination is realized.In addition, the control device in the present embodiment can also include the control device of multiple specific difference in functionalitys.
Specifically, in order to be adjusted to the impedance value of impedance network, above-mentioned control device, including：
First acquisition module, for obtaining duty parameter, above-mentioned duty parameter includes：Working current value or maximum functional
Reactive power value；
Computing module, for according to the duty parameter got, calculating impedance value to be changed；
Second acquisition module, for the mapping table for obtaining default impedance value with switching open and-shut mode；
Determining module, for determining impedance value to be changed from mapping table of the impedance value with switch open and-shut mode
Corresponding switch open and-shut mode；
Switch opening and closing module, for according to the switch open and-shut mode determined, the switch that should be disconnected into each switch to be sent
Open command, and the switch that should be closed into each switch sends close command, so as to be carried out to the impedance value of above-mentioned impedance network
Adjustment.
Wherein, above-mentioned first acquisition module, the duty parameter got are staff according to the current output current of power network
Demand, pass through the parameter in the man-machine interface input control device of the setting of control device.Above-mentioned working current value or most
The other parameters such as rated power that big work reactive power value can also be inputted by staff, net capacity, which calculate, to be formed.
Above-mentioned computing module, calculate when the impedance value changed, following two different operational circumstances be present：Getting
During working current value, and the output voltage of current electric grid is constant, then, control device will be calculated by below equation and treated
The impedance value of change：
Impedance value to be changed=output phase voltage/working current value.
And when getting maximum functional reactive power value, and the output voltage of current electric grid is constant, then first root
According to maximum functional reactive power value and output voltage evaluation work current value, further according to the above-mentioned public affairs for calculating impedance value to be changed
The impedance value that formula treats change is calculated.
Content more than can be seen that on the premise of the output voltage of power network is constant, the impedance value of impedance network
Size and the size of working current value be inversely proportional.
In one embodiment, the corresponding relation of the impedance value that above-mentioned second acquisition module obtains and switch open and-shut mode
Table, can be with as shown in table 1 below：
Table 1
Wherein, in " S1-S6 open and-shut modes " column of table 1, from left to right each in the numeric string be made up of 0 and 1
Numeral represents that S6 is switched from first switch S1 to the 6th opens complete state respectively." 1 " represents closure, and " 0 " represents to disconnect.
Any inductance access power network in first inductance Z1, the second inductance Z2, the 3rd inductance Z3, the 4th inductance Z4 is carried
The impedance value of confession is set as unit impedance.So institute under digitized representation in " total impedance " one column of table 1 current electric grid operating mode
Need the multiple that impedance value is unit impedance.
Accordingly, any inductance in the first inductance Z1, the second inductance Z2, the 3rd inductance Z3, the 4th inductance Z4 is accessed
The current value flowed through during power network is arranged to unitary current.Digitized representation in " maximum current " one column of table 1 current electric grid work
The multiple for the unitary current that can be output under condition.
The change multiple of electric current can be from 0.25 times of unitary current to 4 times of unitary currents, so, the present embodiment is proposed
Impedance network access power network after, the output current value of power network can be adjusted on a large scale.
The mapping table of above-mentioned impedance value and switch open and-shut mode, is set in advance in the memory of control device.
Above-mentioned determining module, for determining resistance to be changed from mapping table of the impedance value with switch open and-shut mode
The process of switch open and-shut mode is exactly process of simply tabling look-up corresponding to anti-value, operation very simple and fast.
The algorithm tabled look-up can be：According to running current be no more than table in listed electric current maximum induction value determine it is to be changed
Impedance value.
Above-mentioned switch is opened and closed module, for according to the switch open and-shut mode determined, the switch that should be disconnected into each switch
Open command is sent, and the switch that should be closed into each switch sends close command, so as to the impedance value to above-mentioned impedance network
The process being adjusted, comprise the following steps (1) to step (6)：
(1) judge whether switch open and-shut mode is unique corresponding to impedance value to be changed, if it is, performing step (2)；
If it is not, then perform step (6)；
(2) the first numeric string for representing the current open and-shut mode respectively switched is obtained by the auxiliary contact of each switch；
(3) found out from mapping table of the impedance value with switch open and-shut mode with the current open and-shut mode respectively switched most
Second numeric string of close switch open and-shut mode；
(4) the first numeric string and the second numeric string are contrasted by turn, are determined inconsistent in the first numeric string and the second numeric string
Numeral corresponding to switch for need change open and-shut mode switch；
(5) switch for determining to need to change open and-shut mode in the mapping table from the impedance value with switching open and-shut mode is
It should disconnect or close, so as to send open command to the switch that should disconnect in the switch for needing to change open and-shut mode, and to
The switch for needing to close in the switch of change open and-shut mode sends close command, so as to be adjusted to the impedance value of impedance network
It is whole；
(6) according to the switch open and-shut mode determined, the switch that should be disconnected into each switch sends open command, and to each
The switch that should be closed in switch sends close command, so as to be adjusted to the impedance value of above-mentioned impedance network.
In above-mentioned steps (2), composition and the definition and pair of above-mentioned impedance value and switch open and-shut mode of the first numeric string
Answer in relation table the content of the numeric string described in " S1-S6 open and-shut modes " column consistent with function, repeat no more here.
In above-mentioned steps (5) and step (6), the impedance value of impedance network is adjusted, including：
Control parameter corresponding to the impedance value, the mainly parameter such as the ratio of pi regulator, integral coefficient are loaded into, to impedance
The impedance value of network is adjusted.
Description more than can be seen that by setting control device, and it is determined that after the impedance value changed, utilize
Control device searches default impedance value with switching the mapping table of open and-shut mode, it is possible to determines the opening and closing shape of each switch
State, so as to the open and-shut mode according to each switch, operation is turned off, it is necessary to which that closes closes to need to disconnect in each switch
Closed operation, so as to be adjusted to the impedance value of impedance network so that the opening and closing operations of switch are accurate and efficiency high.
Embodiment 2
The structural representation of static passive compensation device shown in Figure 3, the present embodiment propose a kind of static var compensation
Device is repaid, including：The impedance network 304 that grid side switchs the 300, first power cell group 302 and above-described embodiment 1 proposes；
Above-mentioned grid side switch 300, above-mentioned impedance network 302 and above-mentioned first power cell group 304 are sequentially connected.
Specifically, above-mentioned first power cell group 304 uses voltage source inverter.
In order to adjust the impedance value of power network, above-mentioned grid side switch 300 is also connected with power network.
Static passive compensation device, including：Low pressure static passive compensation device and high-pressure static reactive power compensation device.
Low pressure static passive compensation device, typically use two level three-phase three-wire systems or three-phase four-wire system power cell；It is right
In high-pressure static reactive power compensation device, typically cells cascaded multilevel type power cell three-phase series group is used.
Low pressure static passive compensation device is usually three-phase three-wire system or three-phase four-wire system, three-phase three-line system
In, power cell has 3 output bridge arms, using 3 phase inductances；In three-phase four-wire system, power cell has 4 output bridge arms,
Using 4 phase inductances；And high-pressure and low-pressure static passive compensation device is usually three-phase three-wire system, using 3 phase inductances.
In summary, the static passive compensation device that the present embodiment provides, by setting with 4 inductance and 6 switches
The adjustable impedance network of impedance value of composition, the impedance value of impedance network can be carried out in the case of different switch opening and closings
Adjustment, for the scope of adjustment from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, with correlation technique in static var compensation
Repay in device and compared using the situation of the less inductance of inductance value, impedance network can be increased in the case where power network exports low current operating mode
Impedance value, in the case where power network output voltage is certain, power network access impedance value it is bigger, then power network output electric current just
It is smaller, so as to improve the control accuracy of electric current under power network low current operating mode, meet power grid control demand.
Embodiment 3
The structural representation of PWM rectifier shown in Figure 4, the present embodiment propose a kind of PWM rectifier, including：Electricity
Net side switchs the impedance network 406 that the 400, second power cell group 402, inversion unit 404 and above-described embodiment 1 describe；
Above-mentioned grid side switch 400, above-mentioned impedance network 406, above-mentioned second power cell group 402 and above-mentioned inversion unit
404 are sequentially connected.
In order to adjust the impedance value of power network, above-mentioned grid side switch 400 is also connected with power network.Inversion unit 404 can also be with
Load equipment connects.
Second power cell group 402, using the bridge arm voltage source type inverter of three-phase three, for low pressure PWM rectifier, typically
Using the bridge arm voltage source type inverter of three-phase three of two level blocks；For middle pressure PWM rectifier, typically using three-level structure
The bridge arm voltage source type inverter of three-phase three.
In summary, the PWM rectifier that the present embodiment provides, by setting the resistance with 4 inductance and 6 switch compositions
The anti-adjustable impedance network of value, the impedance value of impedance network can be adjusted in the case of different switch opening and closings, adjusted
For whole scope from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, with correlation technique in SVC
Compared using the situation of the less inductance of inductance value, the impedance of impedance network in the case where power network exports low current operating mode, can be increased
Value, in the case where power network output voltage is certain, power network access impedance value it is bigger, then power network output electric current with regard to smaller,
So as to improve the control accuracy of electric current under power network low current operating mode, meet power grid control demand.
Embodiment 4
The structural representation of PWM rectifier shown in Figure 5, the present embodiment propose a kind of PWM rectifier, including：Electricity
The first above-mentioned impedance network of net side switch 500, capacitor type filter network 502, the 3rd power cell group 504, above-described embodiment 1
506 and second impedance network 508；
Above-mentioned grid side switch 500, above-mentioned first impedance network 506, above-mentioned second impedance network 508 and above-mentioned 3rd work(
Rate unit group 504 is sequentially connected；
Above-mentioned capacitor type filter network 502 be connected to above-mentioned first impedance network 506 and above-mentioned second impedance network 508 it
Between.
In one embodiment, above-mentioned capacitor type filter network 502 includes multigroup filter capacitor unit, above-mentioned multigroup filter
Each group filter capacitor unit in ripple capacitor cell is respectively in above-mentioned first impedance network 506 and above-mentioned second impedance network 508
Between be connected in parallel；Above-mentioned filter capacitor unit, including：Switching switch 5022 and filter capacitor 5020；Above-mentioned switching switch
5022 first end is connected with above-mentioned filter capacitor 5020；Second end of above-mentioned switching switch 5022 and above-mentioned first impedance network
Bus connection between 506 and above-mentioned second impedance network 508.
Wherein, each switching switch has two connection ends respectively, and in the present embodiment, end where moving contact is first end,
End where static contact is the second end.
In order to adjust the impedance value of power network, above-mentioned grid side switch 500 is also connected with power network.
The 26S Proteasome Structure and Function of first impedance network 506 and the second impedance network 508 is completely the same.
In summary, the PWM rectifier that the present embodiment provides, by setting the resistance with 4 inductance and 6 switch compositions
The anti-adjustable impedance network of value, the impedance value of impedance network can be adjusted in the case of different switch opening and closings, adjusted
For whole scope from 1/4 unit impedance to 4 times of unit impedances, adjusting range is big, with correlation technique in SVC
Compared using the situation of the less inductance of inductance value, the impedance of impedance network in the case where power network exports low current operating mode, can be increased
Value, in the case where power network output voltage is certain, power network access impedance value it is bigger, then power network output electric current with regard to smaller,
So as to improve the control accuracy of electric current under power network low current operating mode, meet power grid control demand.
The computer program product of the method for the progress impedance value adjustment that the embodiment of the present invention is provided, including store journey
The computer-readable recording medium of sequence code, the instruction that described program code includes can be used for performing institute in previous methods embodiment
The method stated, specific implementation can be found in embodiment of the method, will not be repeated here.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, can be with
Realize by another way.Device embodiment described above is only schematical, for example, the division of the unit,
Only a kind of division of logic function, can there is other dividing mode when actually realizing, in another example, multiple units or component can
To combine or be desirably integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or beg for
The mutual coupling of opinion or direct-coupling or communication connection can be by some communication interfaces, device or unit it is indirect
Coupling or communication connection, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
- A kind of 1. impedance network, it is characterised in that including：First inductance, the second inductance, the 3rd inductance, the 4th inductance, first open Pass, second switch, the 3rd switch, the 4th switch, the 5th switch and the 6th switch；The impedance network includes：First output end and the second output end；The first end of first inductance is connected with the first end of the first switch and the first end of the second switch respectively, Form first output end of the impedance network；Second end of first inductance respectively with the 3rd switch the second end and The first end connection of second inductance；Second end of the first end of second inductance also with the 3rd switch is connected；Second end of second inductance respectively with institute State the second end connection of the first end of the 3rd inductance, the second end of the second switch and the 4th switch；The first end of 3rd inductance is also connected with the second end of the second switch and the 4th the second end switched respectively； Second end of the 3rd inductance is connected with the first end of the 4th inductance and the second end of the 5th switch respectively；Second end of the first end of 4th inductance also with the 5th switch is connected, and the second end of the 4th inductance is respectively with the Second end of one switch connects with the second end of the 6th switch；First end, the first end of the 5th switch and the 6th switch that the first end of 3rd switch switchs with the 4th respectively First end connects, and forms second output end of the impedance network.
- 2. impedance network according to claim 1, it is characterised in that also include：Anti- short block；The anti-short block, it is connected with first output end of the impedance network or second output end.
- 3. impedance network according to claim 2, it is characterised in that the anti-short block includes：Resistance and/or electricity Sense.
- 4. a kind of control device, it is characterised in that each switch with the impedance network described in claim any one of 1-3 connects respectively Connect；The control device, for by changing the open and-shut mode respectively switched in the impedance network, to the impedance network Impedance value is adjusted.
- 5. control device according to claim 4, it is characterised in that the control device, including：First acquisition module, for obtaining duty parameter, the duty parameter includes：Working current value or maximum functional are idle Performance number；Computing module, for according to the duty parameter got, calculating impedance value to be changed；Second acquisition module, for the mapping table for obtaining default impedance value with switching open and-shut mode；Determining module, for determining that impedance value to be changed is corresponding in the mapping table from impedance value with switching open and-shut mode Switch open and-shut mode；Switch opening and closing module, for according to the switch open and-shut mode determined, the switch that should be disconnected into each switch to send disconnection Instruction, and the switch that should be closed into each switch sends close command, so as to be adjusted to the impedance value of the impedance network.
- A kind of 6. static passive compensation device, it is characterised in that including：Grid side switch, the first power cell group and right will Seek the impedance network described in any one of 1-3；Grid side switch, the impedance network and the first power cell group are sequentially connected.
- 7. static passive compensation device according to claim 6, it is characterised in that the first power cell group is using electricity Potential source type inverter.
- A kind of 8. PWM rectifier, it is characterised in that including：Grid side switch, the second power cell group, inversion unit and right It is required that the impedance network described in any one of 1-3；Grid side switch, the impedance network, the second power cell group and the inversion unit are sequentially connected.
- A kind of 9. PWM rectifier, it is characterised in that including：Grid side switch, capacitor type filter network, the 3rd power cell group, The first impedance network and the second impedance network described in claim any one of 1-3；The grid side switch, first impedance network, second impedance network and the 3rd power cell group are successively Connection；The capacitor type filter network is connected between first impedance network and second impedance network.
- 10. PWM rectifier according to claim 9, it is characterised in that the capacitor type filter network includes multigroup filtering Capacitor cell, each group filter capacitor unit in multigroup filter capacitor unit is respectively in first impedance network and described It is connected in parallel between second impedance network；The filter capacitor unit, including：Switching switch and filter capacitor；The first end and the filtered electrical of the switching switch Hold connection；Bus between second end of the switching switch and first impedance network and second impedance network connects Connect.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114236202A (en) * | 2021-12-15 | 2022-03-25 | 锦浪科技股份有限公司 | Power grid impedance debugging system and method |
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| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN105932713A (en) * | 2016-06-03 | 2016-09-07 | 国网江苏省电力公司常州供电公司 | Series quasi Z source inverter based grid-tied PV control method |
| CN207743696U (en) * | 2017-11-21 | 2018-08-17 | 北京合力电气传动控制技术有限责任公司 | Impedance network, static passive compensation device, PWM rectifier and relative control apparatus |
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| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN105932713A (en) * | 2016-06-03 | 2016-09-07 | 国网江苏省电力公司常州供电公司 | Series quasi Z source inverter based grid-tied PV control method |
| CN207743696U (en) * | 2017-11-21 | 2018-08-17 | 北京合力电气传动控制技术有限责任公司 | Impedance network, static passive compensation device, PWM rectifier and relative control apparatus |
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| CN114236202A (en) * | 2021-12-15 | 2022-03-25 | 锦浪科技股份有限公司 | Power grid impedance debugging system and method |
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