CN206490576U - Filter circuit for current transformer - Google Patents
Filter circuit for current transformer Download PDFInfo
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- CN206490576U CN206490576U CN201621246195.9U CN201621246195U CN206490576U CN 206490576 U CN206490576 U CN 206490576U CN 201621246195 U CN201621246195 U CN 201621246195U CN 206490576 U CN206490576 U CN 206490576U
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- 239000003990 capacitor Substances 0.000 claims abstract description 203
- 230000005611 electricity Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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Abstract
The utility model provides a kind of filter circuit for current transformer, including filter capacitor loop, current sensing means, two groups and above filter capacitor group and corresponding with two groups and above filter capacitor group two groups and above on-off circuit are provided with filter capacitor loop；Wherein：The electric current of current sensing means detection filter capacitor loop and the controller that the electric current detected is transferred to filter circuit place current transformer；Two groups and above filter capacitor group are exported by controller to the switch control adjustment electric capacity of two groups and above on-off circuit.By filter circuit of the present utility model, the adjustment of the filter capacitor of output can be realized.
Description
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of filter circuit for current transformer.
Background technology
Current transformer is the electric equipment for making voltage, frequency, the number of phases and other electricity or the characteristic of power-supply system change,
Recently as the development of power electronics and automatic control technology, current transformer is widely used in such as photovoltaic generation, wind-powered electricity generation hair
All many-sides such as electricity, inverter energy storage.
In order to meet application demand, it is necessary to which the output to current transformer is filtered.A kind of conventional filtering mode is use
Filter circuit is filtered, by taking the wind electric converter during wind-powered electricity generation generates electricity as an example, and the power that wind-driven generator is produced becomes by wind-powered electricity generation
When flowing the commutation inversion online of device, in order to meet the requirement of the power network quality of power supply, filter circuit such as LCL (filtered electricals can be used
Sense plus filter capacitor) filtering mode.However, during being filtered using filter circuit, often through there is adjustment filtered electrical
The situation of road electric capacity output, for example, LCL filtering can produce resonance point, when different power networks, or the power network a certain moment is due to carrying
Lotus is changed, and LCL can be caused to occur resonance, cause electric capacity burn or capacitor loop in device the phenomenon such as burn.
At present, the effective means that the electric capacity output also not to filter circuit is adjusted, especially adjusts electric capacity output
To avoid filter circuit, the effective means of resonance occurs for such as LCL filter circuits.
Utility model content
The purpose of this utility model is to provide a kind of filter circuit for current transformer, to solve existing filter circuit pair
The demand of filtering circuit capacitor output adjustment, especially LCL filter circuits, which occur to export filtering circuit capacitor during resonance, to be carried out
The needs of problems of adjustment.
According to one side of the present utility model, there is provided a kind of filter circuit for current transformer, the filter circuit bag
Include be provided with filter capacitor loop, the filter capacitor loop current sensing means, two groups and above filter capacitor group and with
Described two groups and above filter capacitor group corresponding two groups and above on-off circuit；Wherein：The current sensing means detects institute
The controller of current transformer where stating the electric current in filter capacitor loop and the electric current detected being transferred into the filter circuit；It is described
Two groups and above filter capacitor group are by the controller to described two groups and the switch control adjustment electric capacity of above on-off circuit
Output, wherein, the controller carries out switch control according to the electric current to described two groups and above on-off circuit.
Alternatively, the filter circuit also includes filter inductance；One end of the current sensing means and the filtered electrical
Sense connection, the other end is connected by described two groups and above on-off circuit with corresponding described two groups and above filter capacitor group.
Alternatively, one group of filter capacitor group in described two groups and above filter capacitor group is in the current transformer normal work
During continuous service；At least one set of filtered electrical in other filter capacitor groups in addition to the filter capacitor group of the continuous service
Appearance group is controlled the closure of corresponding on-off circuit by the controller, adds the filter capacitor group being currently running, to adjust
Electric capacity is exported.
Alternatively, when the filter capacitor group being currently running include two groups and the above when, except two groups be currently running and more than
At least one set of filter capacitor group in other filter capacitor groups outside filter capacitor group is by the controller to corresponding switch
The closure control of circuit, adds the filter capacitor group being currently running, to adjust electric capacity output；Or, be currently running two groups and
In above filter capacitor group, at least one set of filter capacitor group in addition to the filter capacitor group of the continuous service passes through the control
Disconnection of the device to corresponding on-off circuit is controlled, from the filter capacitor group subduction being currently running, to adjust electric capacity output.
Alternatively, described two groups and above on-off circuit receive the controller and detected according to the current sensing means
To electric current determine that the filter circuit meets the condition for occurring resonance when, control signal is opened or closed in transmission, carries out pair
The operation being opened or closed answered.
Alternatively, when the filter capacitor group being currently running includes two groups and the above, described two groups and above filter capacitor
Group determines that resonance is not present in the filter circuit by the controller in the electric current detected according to the current sensing means
When the disconnection of corresponding on-off circuit is controlled, other filter capacitors in addition to the filter capacitor group of the continuous service are fallen in subduction
Group.
Alternatively, each filter capacitor in every group of filter capacitor group is parallel with resistance.
Alternatively, described two groups and above filter capacitor group are three groups of filter capacitor groups.
Alternatively, the current sensing means is Hall current sensor.
Alternatively, the filter circuit is LCL filter circuits, and/or, the current transformer is 3-phase power converter.
The scheme provided according to the utility model, in the filter capacitor loop of filter circuit set current sensing means and
Two groups and above filter capacitor group, so that the filter capacitor controllable of output.Wherein, current sensing means can detect filter in real time
The electric current of ripple capacitor loop, determines to need to filter capacitor in the controller of the current transformer where filter circuit according to the electric current
When output is controlled, then the switch of the corresponding on-off circuit of filter capacitor group is controlled, is adjusted with the filter capacitor to output
It is whole.Especially, if controller determines that filter circuit meets the condition for occurring resonance according to electric current, adjustment filter capacitor is exported, from
And avoid resonance point, it is to avoid resonance occurs for filter circuit, and then avoids the loss of circuit devcie.The filtering that the utility model is provided
Circuit can be widely applied to the filter circuit of various current transformers, to realize the output adjustment of filter capacitor, especially in such as LCL
The filter circuit of type, while effectively filtering is realized, moreover it is possible to avoid the generation of filter circuit resonance.
Brief description of the drawings
Fig. 1 shows a kind of structural representation of filter circuit according to the utility model embodiment；
Fig. 2 shows a kind of topological diagram in filter capacitor loop according to the utility model embodiment.
Embodiment
Exemplary embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
Filter circuit is to allow signal component in the range of certain frequency normal through and preventing another part frequency content
The circuit passed through, is usually used in filtering off the ripple in rectifier output voltage.There is provided one kind for becoming in the utility model embodiment
Flow the filter circuit of device, in the utility model embodiment filtered electrical of filter circuit different from the filter circuit of conventional current transformer
Hold increase in loop and be provided with current sensing means, also, be provided with two groups and above filter capacitor group, thus, filter capacitor
Filter capacitor group in loop can carry out the regulation of electric capacity output in several ways, to meet needs.By the utility model
The filter circuit that embodiment is provided is applied in the scene for avoiding resonance, and filter capacitor realization that can be by adjusting output be avoided
The resonance point of filter circuit, it is to avoid the purpose of resonance occurs for filter circuit.
Reference picture 1, shows a kind of structural representation of filter circuit according to the utility model embodiment.The schematic diagram
A kind of filter circuit for current transformer is shown, the filter circuit includes filter capacitor loop 102, in the filter capacitor loop
Current sensing means 1021 and two groups and above filter capacitor group 1022 are provided with 102, and, with two groups and above filtered electrical
Appearance group corresponding two groups and above on-off circuit 1023.
Wherein, the electric current of the detection filter capacitor loop 102 of current sensing means 1021 and the electric current detected is transferred to
The controller 103 of current transformer where filter circuit；Two groups and above filter capacitor group 1022 by two groups of controller 103 pair and with
The switch control adjustment electric capacity output of upper on-off circuit 1023, wherein, controller 103 is detected according to current sensing means 1021
Electric current switch control is carried out to two groups and above on-off circuit 1023.
When the filter capacitor loop that the utility model embodiment is provided is applied in LC filter circuits, the filter circuit bag
Conventional filter inductance 101 is included, and, the above-mentioned filter capacitor loop 102 that the utility model embodiment is provided.Wherein, electric current
One end of detection means 1021 is connected with filter inductance 101, the other end by two groups and above on-off circuit 1023 with it is corresponding
Two groups and above filter capacitor group 1022 are connected.
The electric current that controller 103 can be detected according to current sensing means 1021 determines whether that on-off circuit 1023 is sent out
Control signal is sent, to control it to be opened or closed.In resonance scene is avoided, controller 103 is according to current sensing means
When 1021 electric currents detected determine that filter circuit meets the condition for occurring resonance, to the disconnected of two groups and above on-off circuit 1023
Open or close and be controlled.
In a kind of feasible embodiment, one group of filter capacitor group in two groups and above filter capacitor group is in current transformer
Continuous service in course of normal operation.That is, current transformer under normal operating conditions, has one group of filter capacitor group continuous service.
In the case, when the electric current that controller 103 is detected according to current sensing means 1021 determines to need to export filter circuit
Electric capacity when being adjusted, when such as filter circuit meets the condition for occurring resonance, it will control two groups and above on-off circuit
One or more groups of closures in 1023, so that in other filter capacitor groups in addition to the filter capacitor group of continuous service at least
One group of filter capacitor group adds the filter capacitor group being currently running, to adjust electric capacity output.That is, except the filtered electrical of continuous service
At least one set of filter capacitor group in other filter capacitor groups outside appearance group is closed by controller 103 to corresponding on-off circuit
Control is closed, the filter capacitor group being currently running is added, to adjust electric capacity output.Under normal circumstances, in the filtered electrical of continuous service
On the basis of appearance group, one group of filter capacitor group, but not limited to this are further added by, two or more sets filter capacitor groups are further added by
Can, the resonance point of filter circuit can be avoided.
If it should be noted that the filter capacitor group being currently running has two groups or more, including lasting
The filter capacitor group of operation, if controller 103 determines to need to be adjusted the electric capacity that filter circuit is exported on this basis,
It then can not only increase electric capacity output by way of increasing filter capacitor group to avoid resonance point, can also be filtered by reducing
The mode of capacitance group reduces electric capacity output to avoid resonance point.Wherein, the filter capacitor group that subduction is fallen does not include continuous service
Filter capacitor group.It can be seen that, in the case, when the filter capacitor group being currently running includes two groups and the above, except being currently running
Two groups and above filter capacitor group outside other filter capacitor groups at least one set of filter capacitor group by controller to right
The closure control for the on-off circuit answered, adds the filter capacitor group being currently running, to adjust electric capacity output；Or, it is currently running
Two groups and above filter capacitor group in, at least one set of filter capacitor group in addition to the filter capacitor group of continuous service passes through control
Disconnection of the device to corresponding on-off circuit is controlled, from the filter capacitor group subduction being currently running, to adjust electric capacity output.
It is a kind of preferred embodiment in, two groups and above filter capacitor group 1022 are three groups of filter capacitor groups.
Hereinafter, so that a kind of LCL filter circuits in 3-phase power converter avoid resonance as an example, above-mentioned filter circuit is entered
Row is further illustrated.
As shown in Fig. 2 a kind of topological diagram in the filter capacitor loop 102 provided for the utility model embodiment.Wherein, filter
Ripple capacitor loop 102 can be connected by A, B, C with one or more filter inductances 101, form LC filter circuits or LCL filters
Wave circuit.In this example, setting filter capacitor loop 102 is connected by A, B, C with two filter inductances 101, forms LCL filters
Wave circuit, also, on-off circuit is using contactor realization.But contactor is not limited to, in actual applications, other on-off circuits
It is equally applicable.
As seen from Figure 2, the filter capacitor group 1022 in this example is made up of three groups of filter capacitor groups, is filtered electrical respectively
Appearance group 1, filter capacitor group 2 and filter capacitor group 3.This three groups of filter capacitor groups are respectively by respective contactor, i.e., corresponding
Contactor 1, contactor 2 and contactor 3 and the Hall current sensor (current detecting for electric current on detection filter capacitor loop
Device 1021) one end connection, the other end of Hall current sensor is connected (not shown in Fig. 2) with two filter inductances 101.
It should be noted that current sensing means is practiced without limitation to Hall current sensor, it is other to detect the device of electric current in real time
It is equally applicable.But compared to other current sensing means, Hall current sensor precision is higher, and isolation performance is also more preferable.
For the filter circuit of LCL types, it has fixed resonance point, can be by formula (1), i.e.,：Calculate and obtain.Wherein, ωnRepresent the resonant frequency of filter circuit；L1Represent the electricity of the first filter inductance
The inductance value of the grid-connected inductance of inductance value, such as wind electric converter connection；L2Represent the inductance value of the second filter inductance, such as wind-powered electricity generation unsteady flow
The inductance value of the primary side inductance of the step-up transformer of device connection；C represents the capacitance of filter capacitor.
Wherein, L1And L2It is fixed, C is different and different with operation electric capacity, is run when there is one group of filter capacitor group
When, C is the capacitance of this group of filter capacitor group output；When there is two groups of filter capacitor group operations, C is two groups of filter capacitor groups
The capacitance of output；When there is three groups of filter capacitor group operations, the capacitance that C exports for three groups of filter capacitor groups, with such
Push away.
When being filtered using the filter circuit in the filter capacitor loop shown in Fig. 2, the first feasible scheme is：Filter
The controller 103 of current transformer where wave circuit is filtered according to the C values and formula (1) of current input filter capacitor group first
The current resonant frequency of wave circuit；The current value of the real-time detection filter capacitor loop of Hall current sensor；Then by the electric current
Value is transferred to controller 103；Controller 103 calculates the current flow frequency in filter capacitor loop after the current value is received
Rate；Whether controller 103 compares current flow frequency consistent with current resonant frequency, if unanimously, then it is assumed that filter circuit is met
Occurs the condition of resonance, it is necessary to adjust the output of filter capacitor；Now, then can be by increasing or decreasing one group of filter capacitor
Group, changes electric capacity output, avoids current resonant frequency.Wherein, current flow frequency it is consistent with current resonant frequency including：Currently
Power frequency and current resonant frequency are equal, can also current flow frequency and current resonant frequency difference in the appropriate of setting
A small range, wherein, the appropriate small range can suitably be set according to actual needs by those skilled in the art, such as 0.5Hz
In the range of etc..
In a kind of feasible program, comparison circuit is provided with controller 103, controller 103 is compared by comparison circuit
Whether current flow frequency is consistent with current resonant frequency；Controller 103 determines current electricity according to the comparative result of comparison circuit
When stream frequency is consistent with current resonant frequency, it is believed that filter circuit meets the condition for occurring resonance, it is necessary to adjust filter capacitor
Output.But this is not limited, in another feasible program, current flow frequency can also be directly carried out by controller 103 and current
Resonant frequency whether consistent comparison and judgement.
When it is determined that needing to adjust the output of filter capacitor, if currently run for one group of filter capacitor group, i.e., lasting fortune
Capable filter capacitor group, then can increase by one group of filter capacitor group；If having put into two groups of filter capacitor groups (including continuous service
Filter capacitor group), in normal course of operation, resonance is there occurs again, then can put into the 3rd group of filter capacitor group or cut one
Group filter capacitor group (the filter capacitor group cut does not include the capacitance group of continuous service)；If having put into three groups of filter capacitor groups,
In normal course of operation, resonance is there occurs again, then can cutting one group of filter capacitor group, (the filter capacitor group cut does not include holding
The capacitance group of reforwarding row).It can be seen that, when there is multigroup filter capacitor group to run simultaneously, when occurring resonance again in normal course of operation,
If circuit still has redundancy filter capacitor group, increase or cut filter capacitor group；If circuit has not had redundancy filter capacitor
Group, then can cut filter capacitor group.By increasing and decreasing filter capacitor group, the output of filter capacitor is adjusted, to avoid resonance point.
When designing the capacitance of filter capacitor group, under normal circumstances, it is ensured that one group of filter capacitor group is the filter of continuous service
Ripple capacitance group is run, and the capacitances of other filter capacitor groups can suitably be set according to actual condition by those skilled in the art
Fixed, the embodiment of the present invention is not restricted to this.For example, the capacitance of other filter capacitor groups can be filtered with that group of continuous service
The capacitance of capacitance group is identical, can also be different；Also, the capacitance between each filter capacitor group in other filter capacitor groups
Can be with identical or different.By taking three groups of filter capacitor groups shown in Fig. 2 as an example, setting filter capacitor group 1 is held according to conventional
Reforwarding row, then filter capacitor group 2 and filter capacitor group 3 can neatly take filter capacitor group 1 accordingly based upon actual test operating mode
Capacitance 1/4 or 1/3 etc..
In addition, after filter capacitor group adjusts postrun a period of time, if judging, power network operating mode is recovered, filtered electrical
Road no longer meets the condition that occurs resonance, and (within the specific limits, this one for the difference of such as current flow frequency and current resonant frequency
Determining scope can be appropriately arranged with by those skilled in the art according to actual conditions, and the embodiment of the present invention is not restricted to this), it can attempt
Cut increased filter capacitor group.If the filter capacitor group currently run there are two groups, judging that filter circuit no longer meets generation
After the condition of resonance, then retain that group of continuous service, cut that rear increased group；If the filter capacitor group currently run has two
More than group, after judging that filter circuit no longer meets the condition for occurring resonance, retain that group of filter capacitor group of continuous service, and
For the filter capacitor group of other rear increase operations, it can simultaneously reduce, can also reduce successively one by one.It is currently running that is, working as
Filter capacitor group when including two groups and the above, two groups and above filter capacitor group are by controller 103 according to current detecting
The electric current that device 1021 is detected determines to control the disconnection of corresponding on-off circuit when resonance is not present in filter circuit, and subduction is fallen
Other filter capacitor groups in addition to the filter capacitor group of continuous service.
In actual applications, the filter circuit based on two groups of filter capacitor groups substantially can just realize the need for avoiding resonance
Ask, but based on three groups of filter capacitor groups in filter capacitor group more than two such as Fig. 2, relative cost is less high, topology
, can be more flexible in the case that structure is not very complicated relatively, it can also better adapt to operating mode.
By the above-mentioned means, the electric current that controller 103 is detected according to current sensing means 1021 obtains current flow frequency
Rate, current resonant frequency is obtained according to the inductance value of filter inductance 101 and the capacitance present value of filter capacitor 1022；Controller
103, by comparing the current flow frequency and current resonant frequency of filter circuit, determine whether filter circuit meets generation resonance
Condition；If meeting the condition for occurring resonance, it is a kind of in the case of, can be from its in addition to the filter capacitor group being currently running
One group of filter capacitor group is selected in its filter capacitor group, will by closing the corresponding on-off circuit of filter capacitor group of selection
The filter capacitor group of selection is added to the filter capacitor group being currently running, and is exported with the electric capacity for adjusting filter capacitor；It is another
In the case of kind, if existing multigroup filter capacitor group is currently running, it can reduce one or more groups of.When controller 103 is according to electric current
The electric current that detection means 1021 is detected determines that resonance is not present in filter circuit, and the filter capacitor group being currently running includes two groups
And during the above, disconnected by the corresponding on-off circuit of the filter capacitor group for running increase, the filter capacitor of subduction increase operation
Group.
Moreover it is preferred that as shown in Figure 2, each filter capacitor in every group of filter capacitor group can with parallel resistance,
With capacitive energy of after filter circuit is out of service, releasing, for example, after the shutdown of wind power generator group, by the energy of electric capacity
Release.
When the filter circuit using the filter capacitor loop shown in Fig. 2 is filtered, second of feasible scheme is：
The size of the electric current of resonance occurs with filter circuit for the size for the electric current that controller 103 can be detected according to current sensing means
Whether unanimously (for example, controller 103 directly compares determination, or, controller 103 compares determination by comparison circuit) judge filter
Whether wave circuit meets the condition for occurring resonance；If consistent, determine that filter circuit meets the condition for occurring resonance, then adjustment filtering
The electric capacity output of capacitance group.Wherein, the size that the electric current of resonance occurs for filter circuit can be obtained by conventional methods, herein not
Repeat again.In this kind of mode, controller 103 directly compares the current flow and resonance current of filter circuit, alleviates meter
Calculate burden.
Wherein, the current flow of filter circuit it is consistent with resonance current including：Current flow and resonance current are equal, or
Person, current flow and resonance difference between currents setting appropriate a small range, wherein, the appropriate small range can be by this area
Technical staff suitably sets according to actual needs, such as 0.5A.
When controller 103 determines that the current flow of filter circuit is consistent with resonance current, the electricity of filter capacitor group is adjusted
Hold output, to avoid the resonance point of filter circuit.Wherein, the adjustment to the electric capacity output of filter capacitor group can use foregoing adjustment
Mode, i.e., by increasing or decreasing filter capacitor group, change electric capacity output, avoid current resonant frequency, will not be repeated here.
Above-mentioned filter capacitor loop can be widely applied in the filter circuit of current transformer, especially 3-phase power converter, such as wind
In the LCL filter circuits of electric converter.The filter circuit that the utility model embodiment is provided can realize the regulation of output capacitance,
Especially in the case where that may occur resonance, by changing the capacitor's capacity of filter circuit, actively hide power network resonance point, solve
The live unit power network of such as wind electric converter of having determined is changed the resonance risk brought so that wind-powered electricity generation Current transform unit power network is adapted to
Property is more flexible.
It is described above, embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, it should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power
The protection domain that profit is required is defined.
Claims (10)
1. a kind of filter circuit for current transformer, the filter circuit includes filter capacitor loop, it is characterised in that the filter
Be provided with ripple capacitor loop current sensing means, two groups and above filter capacitor group and with described two groups and above filtered electrical
Appearance group corresponding two groups and above on-off circuit；
Wherein：
The current sensing means detects the electric current in the filter capacitor loop and the electric current detected is transferred into the filtering
The controller of current transformer where circuit；
Described two groups and above filter capacitor group are controlled the switch of described two groups and above on-off circuit by the controller
Electric capacity output is adjusted, wherein, the controller carries out switch control according to the electric current to described two groups and above on-off circuit.
2. filter circuit according to claim 1, it is characterised in that the filter circuit also includes filter inductance；It is described
One end of current sensing means is connected with the filter inductance, the other end by described two groups and above on-off circuit with it is corresponding
Described two groups and the connection of above filter capacitor group.
3. filter circuit according to claim 1 or 2, it is characterised in that in described two groups and above filter capacitor group
One group of filter capacitor group continuous service in the current transformer course of normal operation；
At least one set of filter capacitor group in other filter capacitor groups in addition to the filter capacitor group of the continuous service passes through institute
State controller to control the closure of corresponding on-off circuit, add the filter capacitor group being currently running, to adjust electric capacity output.
4. filter circuit according to claim 3, it is characterised in that when the filter capacitor group being currently running include two groups and
During the above,
At least one set of filter capacitor group in other filter capacitor groups in addition to two groups be currently running and above filter capacitor group
The closure of corresponding on-off circuit is controlled by the controller, the filter capacitor group being currently running is added, to adjust electric capacity
Output；
Or,
In two groups be currently running and above filter capacitor group, at least one set of filter in addition to the filter capacitor group of the continuous service
Ripple capacitance group is controlled the disconnection of corresponding on-off circuit by the controller, from the filter capacitor group subduction being currently running,
To adjust electric capacity output.
5. filter circuit according to claim 1 or 2, it is characterised in that described two groups and above on-off circuit reception institute
State controller and determine that the filter circuit meets the condition for occurring resonance in the electric current detected according to the current sensing means
When, transmission is opened or closed control signal, carries out the corresponding operation being opened or closed.
6. filter circuit according to claim 3, it is characterised in that when the filter capacitor group being currently running include two groups and
During the above, described two groups and above filter capacitor group are by the controller in the electricity detected according to the current sensing means
Stream determines to control the disconnection of corresponding on-off circuit when resonance is not present in the filter circuit, and subduction is fallen except the continuous service
Filter capacitor group outside other filter capacitor groups.
7. filter circuit according to claim 1 or 2, it is characterised in that each filtered electrical in every group of filter capacitor group
Rong Jun is parallel with resistance.
8. filter circuit according to claim 1 or 2, it is characterised in that described two groups and above filter capacitor group are three
Group filter capacitor group.
9. filter circuit according to claim 1 or 2, it is characterised in that the current sensing means passes for Hall current
Sensor.
10. filter circuit according to claim 1 or 2, it is characterised in that the filter circuit is LCL filter circuits,
And/or, the current transformer is 3-phase power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621246195.9U CN206490576U (en) | 2016-11-11 | 2016-11-11 | Filter circuit for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621246195.9U CN206490576U (en) | 2016-11-11 | 2016-11-11 | Filter circuit for current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206490576U true CN206490576U (en) | 2017-09-12 |
Family
ID=59768757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621246195.9U Active CN206490576U (en) | 2016-11-11 | 2016-11-11 | Filter circuit for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206490576U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460053A (en) * | 2019-04-25 | 2019-11-15 | 南京科技职业学院 | A kind of grid-connected filtering automatic regulating system of double-fed fan motor unit and method |
-
2016
- 2016-11-11 CN CN201621246195.9U patent/CN206490576U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460053A (en) * | 2019-04-25 | 2019-11-15 | 南京科技职业学院 | A kind of grid-connected filtering automatic regulating system of double-fed fan motor unit and method |
| CN110460053B (en) * | 2019-04-25 | 2023-02-28 | 南京科技职业学院 | Grid-connected filtering automatic adjusting system and method for double-fed wind turbine generator |
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