CN107918058A - A kind of detection method and device of filter inductance - Google Patents
A kind of detection method and device of filter inductance Download PDFInfo
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- CN107918058A CN107918058A CN201711238379.XA CN201711238379A CN107918058A CN 107918058 A CN107918058 A CN 107918058A CN 201711238379 A CN201711238379 A CN 201711238379A CN 107918058 A CN107918058 A CN 107918058A
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- filter inductance
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- collected
- inductance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2611—Measuring inductance
Abstract
The present invention provides a kind of detection method of filter inductance, method includes：In the grid-connected preceding pulse signal to inverter circuit switch application time for t；High-frequency sampling is carried out to the electric current of filter inductance in real time；Electric current based on the filter inductance collected judges whether filter inductance is abnormal.The present invention can effectively detect whether filter inductance fails while additional devices are not increased.The invention also discloses a kind of detection device of filter inductance.
Description
Technical field
The present invention relates to fault detection technique field, more particularly to a kind of detection method and device of filter inductance.
Background technology
When direct current is become alternating current, the ac filter inductance of inverter output, plays to ac output current
The effect of smothing filtering, it can thus be seen that filter inductance rises emphatically during direct current is become alternating current by inverter
The effect wanted.Filter inductance is self-made components, due to the process variations of manufacture, in carrying, installation, vibrations or long-term ageing operation
Afterwards, there are the risk of failure, it is therefore desirable to filter inductance is detected, judges whether it fails.
At present, it is typically employed in and the mode of temperature sensor is added in filter inductance judges whether filter inductance fails.
When the temperature that temperature sensor detects maximum operating temperature normal more than filter inductance, judge that filter inductance fails.By
This can be seen that the existing mode to filter inductance detection, on the one hand, the addition of temperature sensor causes the increasing of cost
Adding, and add the technology difficulty of the filter inductance manufacturing, uniformity is difficult to control, and the circuit of temperature sensor is also longer,
Cabling is difficult, and when temperature anomaly can also make other components have the risk of damage.On the other hand, if inverter runs it in complete machine
Preceding filter inductance has just failed, and existing this detection mode can not judge that filter inductance is before the operation of inverter complete machine
It is no to have failed.
Therefore, how effectively to judge whether filter inductance has damaged, failed is a urgent problem to be solved.
The content of the invention
In view of this, the present invention provides a kind of detection method of filter inductance, the same of additional devices can not increased
When, effectively detect whether filter inductance fails.
The present invention provides a kind of detection method of filter inductance, the described method includes：
In the grid-connected preceding pulse signal to inverter circuit switch application time for t；
High-frequency sampling is carried out to the electric current of filter inductance in real time；
Electric current based on the filter inductance collected judges whether the filter inductance is abnormal.
Preferably, the method further includes：
When judging that the filter inductance is abnormal, fault cues information is generated.
Preferably, the electric current based on the filter inductance collected judges whether the filter inductance wraps extremely
Include：
Whether the maximum current of the filter inductance and the difference of minimum current that judgement collects meet preset condition；
When the maximum current of the filter inductance and the difference of minimum current that collect meet preset condition, institute is judged
State the maximum current of the filter inductance collected and whether the difference of minimum current is less than the first predetermined threshold value, if so, then
The filter inductance is in normal condition, if it is not, then：
It is pre- whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are more than second
If threshold value, if so, then there is exception in the filter inductance, wherein, second predetermined threshold value is more than first predetermined threshold value.
Preferably, when the maximum current of the filter inductance and the difference of minimum current that collect are unsatisfactory for preset condition
When, further include：
Calculate the reactance sensibility reciprocal of the filter inductance；
Reactance sensibility reciprocal based on the filter inductance judges whether the filter inductance is abnormal.
Preferably, the reactance sensibility reciprocal based on the filter inductance judges whether the filter inductance includes extremely：
Judge whether the reactance sensibility reciprocal of the filter inductance is less than reactance sensibility reciprocal preset value, if so, the then filter inductance
Occur abnormal.
A kind of detection device of filter inductance, including：
Controller, in the grid-connected preceding pulse signal to inverter circuit switch application time for t；
Current detection circuit, for carrying out high-frequency sampling to the electric current of filter inductance in real time；
Processor, judges whether the filter inductance is abnormal for the electric current based on the filter inductance collected.
Preferably, described device further includes：
Alarm, for when judging that the filter inductance is abnormal, generating fault cues information.
Preferably, the processor includes：
First judgment module, the maximum current of the filter inductance and the difference of minimum current for judging to collect are
It is no to meet preset condition；
Second judgment module, for meeting when the maximum current of the filter inductance collected and the difference of minimum current
During preset condition, whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are less than first
Predetermined threshold value, if so, then the filter inductance is in normal condition, if it is not, then：
It is pre- whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are more than second
If threshold value, if so, then there is exception in the filter inductance, wherein, second predetermined threshold value is more than first predetermined threshold value.
Preferably, the processor further includes：
Computing module, the maximum current of the filter inductance and the difference of minimum current for that ought collect are unsatisfactory for pre-
If during condition, calculate the reactance sensibility reciprocal of the filter inductance；
3rd judgment module, judges whether the filter inductance is abnormal for the reactance sensibility reciprocal based on the filter inductance.
Preferably, the 3rd judgment module is specifically used for：
Judge whether the reactance sensibility reciprocal of the filter inductance is less than reactance sensibility reciprocal preset value, if so, the then filter inductance
Occur abnormal.
It can be seen from the above technical proposal that the present invention provides a kind of detection method of filter inductance, when needs are to filter
Ripple inductance carry out fault detect when, first it is grid-connected it is preceding to inverter circuit switch application time be t pulse signal, then in real time
High-frequency sampling is carried out to the electric current of filter inductance, so as to more real collection reactive current, according to the filtered electrical collected
The electric current of sense judges whether filter inductance exception occurs.Realize while additional devices are not increased, effectively detect
Whether filter inductance fails.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of method flow diagram of the detection method embodiment 1 of filter inductance disclosed by the invention；
Fig. 2 is a kind of method flow diagram of the detection method embodiment 2 of filter inductance disclosed by the invention；
Fig. 3 is a kind of method flow diagram of the detection method embodiment 3 of filter inductance disclosed by the invention；
Fig. 4 is a kind of structure diagram of the detection device embodiment 1 of filter inductance disclosed by the invention；
Fig. 5 is a kind of structure diagram of the detection device embodiment 2 of filter inductance disclosed by the invention；
Fig. 6 is a kind of structure diagram of the detection device embodiment 3 of filter inductance disclosed by the invention；
Fig. 7 is three-phase inverting circuit major loop schematic diagram disclosed by the invention；
Fig. 8 is a kind of example schematic of the detection device of filter inductance disclosed by the invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
As shown in Figure 1, be a kind of flow chart of the embodiment 1 of the detection method of filter inductance disclosed by the invention, it is described
Method may comprise steps of：
S101, it is grid-connected it is preceding to inverter circuit switch application time be t pulse signal；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
S102, carry out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency sampling in switch periods, i.e., in a switch
Multiple repairing weld is carried out to the electric current of filter inductance in cycle.Sampled, the electric current collected can be carried out more preferable by high-frequency
Analysis.It should be noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
S103, the electric current based on the filter inductance collected judge whether filter inductance is abnormal.
Then filter inductance is judged according to the electric current of the filter inductance collected, so as to detect that filter inductance is
It is no exception occur.
In conclusion in the above-described embodiments, when needing to carry out fault detect to filter inductance, first grid-connected preceding right
The pulse signal that inverter circuit switch application time is t, then carries out high-frequency sampling, root to the electric current of filter inductance in real time
Judge whether filter inductance exception occurs according to the electric current of the filter inductance collected.Realizing is not increasing the same of additional devices
When, effectively detect whether filter inductance fails.
As shown in Fig. 2, be a kind of flow chart of the embodiment 2 of the detection method of filter inductance disclosed by the invention, it is described
Method may comprise steps of：
S201, it is grid-connected it is preceding to inverter circuit switch application time be t pulse signal；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
S202, carry out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency sampling in switch periods, i.e., in a switch
Multiple repairing weld is carried out to the electric current of filter inductance in cycle.Sampled, the electric current collected can be carried out more preferable by high-frequency
Analysis.It should be noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
Whether the maximum current of ripple inductance and the difference of minimum current that S203, judgement collect meet preset condition, if
It is, then into S204：
After the electric current of filter inductance is collected in switch periods, the maximum current to the filter inductance collected
The difference of ILmax and minimum current ILmin are judged, judge whether the difference of maximum current and minimum current meets default bar
Part, that is, judge whether the difference of maximum current and minimum current exceedes a certain number range.
Whether the maximum current for the filter inductance that S204, judgement collect and the difference of minimum current are less than the first default threshold
Value, if so, then entering S205, if it is not, then entering S206：
When the maximum current of ripple inductance and the difference of minimum current that collect meet preset condition, determine whether to adopt
Whether the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are less than the first predetermined threshold value Irate1.
Wherein, the first predetermined threshold value Irate1 can flexibly be set according to detection actual demand.
S205, filter inductance are in normal condition；
When the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are less than the first default threshold
During value Irate1, judging result is in normal condition for filter inductance.
It is pre- whether the maximum current for the filter inductance that S206, judgement collect and the difference of minimum current are more than second
If threshold value, wherein, second predetermined threshold value is more than first predetermined threshold value, if so, then entering S207：
When the maximum current of the filter inductance collected and the difference of minimum current are more than or equal to the first predetermined threshold value, into
It is default that one step judges whether the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are more than second
Threshold value Irate2, wherein, the second predetermined threshold value Irate2 can flexibly be set according to detection actual demand.In addition, it is necessary to
Illustrate, the second predetermined threshold value Irate2 is far longer than the first predetermined threshold value Irate1, for example, second is default
Threshold value Irate2 is more than twice of first predetermined threshold value Irate1.
S207, filter inductance occur abnormal；
When the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are more than the second default threshold
During value Irate2, judging result is in abnormality for filter inductance.
S208, generation fault cues information.
When judging that filter inductance is in abnormality, fault cues information can be further generated, to allow testing staff
It is abnormal more directly to judge that filter inductance occurs.
In conclusion the present embodiment is on the basis of above-described embodiment, further by the maximum current of filter inductance with
The size of the difference of minimum current judges whether filter inductance exception occurs, when the maximum current and minimum current of filter inductance
When difference is less than the first predetermined threshold value, judging result be in normal condition for filter inductance, when filter inductance maximum current and
When the difference of minimum current is more than the second predetermined threshold value, there is exception for filter inductance in judging result, and goes out in filter inductance
When now abnormal, fault cues information can be further generated, so that testing staff can intuitively judge that filter inductance appearance is different
Often.
As shown in figure 3, be a kind of flow chart of the embodiment 3 of the detection method of filter inductance disclosed by the invention, it is described
Method may comprise steps of：
S301, it is grid-connected it is preceding to inverter circuit switch application time be t pulse signal；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
S302, carry out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency in switch periods, i.e., in a switch periods
The interior electric current to filter inductance carries out multiple repairing weld.By high-frequency, the electric current collected can preferably be analyzed.Need
It is noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
Whether the maximum current of ripple inductance and the difference of minimum current that S303, judgement collect meet preset condition, if
It is no, then into S304：
After the electric current of filter inductance is collected in switch periods, the maximum current to the filter inductance collected
The difference of ILmax and minimum current ILmin are judged, judge whether the difference of maximum current and minimum current meets default bar
Part, that is, judge whether the difference of maximum current and minimum current exceedes a certain number range.
S304, the reactance sensibility reciprocal for calculating filter inductance；
When the maximum current of the filter inductance collected and the difference of minimum current are unsatisfactory for preset condition, that is, collect
Ripple inductance maximum current and minimum current difference comparsion it is small when, be not enough to the electric current by filter inductance to filter inductance
Failure judged.At this point it is possible to calculate the reactance sensibility reciprocal of filter inductance.When calculating the reactance sensibility reciprocal of filter inductance,
By taking the three-phase inverting circuit shown in Fig. 7 as an example, the reactance calculation of filter inductance L1 is Ldi/dt=UL wherein UL=Ud-
The voltage of Uc2, Uc2 obtain for Ud*d, and wherein d is the sine wave duty cycle to the IGBT module setting in inverter circuit, and Uc2 is
The voltage of filter capacitor c2, Ud are busbar voltage.
S305, the reactance sensibility reciprocal based on filter inductance judge whether filter inductance is abnormal.
Then judge whether filter inductance exception occurs according to the reactance sensibility reciprocal of the filter inductance calculated.
Specifically, when according to the reactance sensibility reciprocal of the filter inductance calculated to judge whether filter inductance occurs abnormal,
When the reactance sensibility reciprocal of filter inductance is less than reactance sensibility reciprocal preset value, judging result occurs abnormal for filter inductance.Work as filtered electrical
When sense occurs abnormal, fault cues information can be equally generated, to allow testing staff more directly to judge filter inductance
Occur abnormal.
In conclusion the present embodiment is on the basis of above-described embodiment, when being not enough to the maximum current by filter inductance
, can be by calculating the reactance sensibility reciprocal of filter inductance, based on filter during with the difference of minimum current to judge filter inductance
The reactance sensibility reciprocal of ripple inductance judges whether filter inductance is abnormal, when the reactance sensibility reciprocal of filter inductance is less than reactance sensibility reciprocal preset value
When, then it is abnormal to show that filter inductance occurs.
As shown in figure 4, be a kind of structure diagram of the embodiment 1 of the detection device of filter inductance disclosed by the invention,
Described device can include：
Controller 401, in the grid-connected preceding pulse signal to inverter circuit switch application time for t；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
Current detection circuit 402, for carrying out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency sampling in switch periods, i.e., in a switch
Multiple repairing weld is carried out to the electric current of filter inductance in cycle.Sampled, the electric current collected can be carried out more preferable by high-frequency
Analysis.It should be noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
Processor 403, judges whether filter inductance is abnormal for the electric current based on the filter inductance collected.
Then filter inductance is judged according to the electric current of the filter inductance collected, so as to detect that filter inductance is
It is no exception occur.
In conclusion in the above-described embodiments, when needing to carry out fault detect to filter inductance, first grid-connected preceding right
The pulse signal that inverter circuit switch application time is t, then carries out high-frequency sampling, root to the electric current of filter inductance in real time
Judge whether filter inductance exception occurs according to the electric current of the filter inductance collected.Realizing is not increasing the same of additional devices
When, effectively detect whether filter inductance fails.
Specifically, in order to become apparent from illustrating above-described embodiment, retouched in detail with an instantiation below
State.
As shown in figure 8, it is a kind of example schematic of the detection device of filter inductance disclosed by the invention.As shown in the figure,
When needing to be detected filter inductance L1, certain direct current applies inverter circuit by the controller in control circuit
Pressure, carries out Pulse Width Control, application time is the pulse signal of t to the fixed switch of inverter circuit.
Then the current detectings being connected of the current detecting point CT3 between inverter circuit and filter inductance L1 and protection are passed through
The electric current of current detection circuit real-time flow filtration ripple inductance in switch periods in circuit carries out high-frequency sampling, for example,
Multiple repairing weld is carried out to the electric current of filter inductance in a switch periods by the current sensor in current detection circuit.
Then by with the processor in current detecting and the control circuit that is connected of protection circuit, according to current detection circuit
The electric current of the filter inductance collected judges filter inductance, so as to detect whether filter inductance exception occurs.
As shown in figure 5, be a kind of structure diagram of the embodiment 2 of the detection device of filter inductance disclosed by the invention,
Described device can include：
Controller 501, in the grid-connected preceding pulse signal to inverter circuit switch application time for t；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
Current detection circuit 502, for carrying out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency sampling in switch periods, i.e., in a switch
Multiple repairing weld is carried out to the electric current of filter inductance in cycle.Sampled, the electric current collected can be carried out more preferable by high-frequency
Analysis.It should be noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
Whether the first judgment module 503, the maximum current of the ripple inductance collected for judgement and the difference of minimum current
Meet preset condition；
After the electric current of filter inductance is collected in switch periods, the maximum current to the filter inductance collected
The difference of ILmax and minimum current ILmin are judged, judge whether the difference of maximum current and minimum current meets default bar
Part, that is, judge whether the difference of maximum current and minimum current exceedes a certain number range.
Second judgment module 504, for when the maximum current of the filter inductance and the difference of minimum current that collect
When meeting preset condition, whether the maximum current for the filter inductance for judging to collect and the difference of minimum current are less than first and preset
Threshold value, if so, then filter inductance is in normal condition, if it is not, then judge the maximum current of the filter inductance that collects with
Whether the difference of minimum current is more than the second predetermined threshold value, wherein, second predetermined threshold value is more than first predetermined threshold value,
If so, then there is exception in filter inductance；
When the maximum current of ripple inductance and the difference of minimum current that collect meet preset condition, determine whether to adopt
Whether the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are less than the first predetermined threshold value Irate1.
Wherein, the first predetermined threshold value Irate1 can flexibly be set according to detection actual demand.
When the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are less than the first default threshold
During value Irate1, judging result is in normal condition for filter inductance.
When the maximum current of the filter inductance collected and the difference of minimum current are more than or equal to the first predetermined threshold value, into
It is default that one step judges whether the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are more than second
Threshold value Irate2, wherein, the second predetermined threshold value Irate2 can flexibly be set according to detection actual demand.In addition, it is necessary to
Illustrate, the second predetermined threshold value Irate2 is far longer than the first predetermined threshold value Irate1, for example, second is default
Threshold value Irate2 is more than twice of first predetermined threshold value Irate1.
When the difference of the maximum current ILmax and minimum current ILmin of the filter inductance collected are more than the second default threshold
During value Irate2, judging result is in abnormality for filter inductance.
Alarm 505, for generating fault cues information.
When judging that filter inductance is in abnormality, fault cues information can be further generated, to allow testing staff
It is abnormal more directly to judge that filter inductance occurs.
In conclusion the present embodiment is on the basis of above-described embodiment, further by the maximum current of filter inductance with
The size of the difference of minimum current judges whether filter inductance exception occurs, when the maximum current and minimum current of filter inductance
When difference is less than the first predetermined threshold value, judging result be in normal condition for filter inductance, when filter inductance maximum current and
When the difference of minimum current is more than the second predetermined threshold value, there is exception for filter inductance in judging result, and goes out in filter inductance
When now abnormal, fault cues information can be further generated, so that testing staff can intuitively judge that filter inductance appearance is different
Often.
As shown in fig. 6, be a kind of structure diagram of the embodiment 3 of the detection device of filter inductance disclosed by the invention,
Described device can include：
Controller 601, in the grid-connected preceding pulse signal to inverter circuit switch application time for t；
It is before inverter circuit is grid-connected, i.e., right between AC relay actuation when needing to be detected filter inductance
Inverter circuit applies certain DC voltage, carries out Pulse Width Control to the fixed switch of inverter circuit, application time is the pulse of t
Signal.
Current detection circuit 602, for carrying out high-frequency sampling to the electric current of filter inductance in real time；
Then, the electric current of real-time flow filtration ripple inductance carries out high-frequency sampling in switch periods, i.e., in a switch
Multiple repairing weld is carried out to the electric current of filter inductance in cycle.Sampled, the electric current collected can be carried out more preferable by high-frequency
Analysis.It should be noted that the electric current of the filter inductance collected includes the current maxima collected and minimum value.
Whether the first judgment module 603, the maximum current of the ripple inductance collected for judgement and the difference of minimum current
Meet preset condition；
After the electric current of filter inductance is collected in switch periods, the maximum current to the filter inductance collected
The difference of ILmax and minimum current ILmin are judged, judge whether the difference of maximum current and minimum current meets default bar
Part, that is, judge whether the difference of maximum current and minimum current exceedes a certain number range.
Computing module 604, for calculating the reactance sensibility reciprocal of filter inductance；
When the maximum current of the filter inductance collected and the difference of minimum current are unsatisfactory for preset condition, that is, collect
Ripple inductance maximum current and minimum current difference comparsion it is small when, be not enough to the electric current by filter inductance to filter inductance
Failure judged.At this point it is possible to calculate the reactance sensibility reciprocal of filter inductance.When calculating the reactance sensibility reciprocal of filter inductance,
By taking the three-phase inverting circuit shown in Fig. 7 as an example, the reactance calculation of filter inductance L1 is Ldi/dt=UL wherein UL=Ud-
The voltage of Uc2, Uc2 obtain for Ud*d, and wherein d is the sine wave duty cycle to the IGBT module setting in inverter circuit, and Uc2 is
The voltage of filter capacitor c2, Ud are busbar voltage.
3rd judgment module 605, judges whether filter inductance is abnormal for the reactance sensibility reciprocal based on filter inductance.
Then judge whether filter inductance exception occurs according to the reactance sensibility reciprocal of the filter inductance calculated.
Specifically, when according to the reactance sensibility reciprocal of the filter inductance calculated to judge whether filter inductance occurs abnormal,
When the reactance sensibility reciprocal of filter inductance is less than reactance sensibility reciprocal preset value, judging result occurs abnormal for filter inductance.Work as filtered electrical
When sense occurs abnormal, fault cues information can be equally generated, to allow testing staff more directly to judge filter inductance
Occur abnormal.
In conclusion the present embodiment is on the basis of above-described embodiment, when being not enough to the maximum current by filter inductance
, can be by calculating the reactance sensibility reciprocal of filter inductance, based on filter during with the difference of minimum current to judge filter inductance
The reactance sensibility reciprocal of ripple inductance judges whether filter inductance is abnormal, when the reactance sensibility reciprocal of filter inductance is less than reactance sensibility reciprocal preset value
When, then it is abnormal to show that filter inductance occurs.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes each exemplary composition and step according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical solution.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
Can directly it be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (10)
- A kind of 1. detection method of filter inductance, it is characterised in that the described method includes：In the grid-connected preceding pulse signal to inverter circuit switch application time for t；High-frequency sampling is carried out to the electric current of filter inductance in real time；Electric current based on the filter inductance collected judges whether the filter inductance is abnormal.
- 2. according to the method described in claim 1, it is characterized in that, further include：When judging that the filter inductance is abnormal, fault cues information is generated.
- 3. method according to claim 1 or 2, it is characterised in that the electricity based on the filter inductance collected Stream judges whether the filter inductance includes extremely：Whether the maximum current of the filter inductance and the difference of minimum current that judgement collects meet preset condition；When the maximum current of the filter inductance and the difference of minimum current that collect meet preset condition, adopted described in judgement Whether the maximum current of the filter inductance collected and the difference of minimum current are less than the first predetermined threshold value, if so, then described Filter inductance is in normal condition, if it is not, then：Whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are more than the second default threshold Value, if so, then there is exception in the filter inductance, wherein, second predetermined threshold value is more than first predetermined threshold value.
- 4. according to the method described in claim 3, it is characterized in that, when the maximum current of the filter inductance that collect with most When the difference of low current is unsatisfactory for preset condition, further include：Calculate the reactance sensibility reciprocal of the filter inductance；Reactance sensibility reciprocal based on the filter inductance judges whether the filter inductance is abnormal.
- 5. according to the method described in claim 4, it is characterized in that, the reactance sensibility reciprocal based on the filter inductance judges institute State whether filter inductance includes extremely：Judge whether the reactance sensibility reciprocal of the filter inductance is less than reactance sensibility reciprocal preset value, if so, then the filter inductance occurs It is abnormal.
- A kind of 6. detection device of filter inductance, it is characterised in that including：Controller, in the grid-connected preceding pulse signal to inverter circuit switch application time for t；Current detection circuit, for carrying out high-frequency sampling to the electric current of filter inductance in real time；Processor, judges whether the filter inductance is abnormal for the electric current based on the filter inductance collected.
- 7. device according to claim 6, it is characterised in that further include：Alarm, for when judging that the filter inductance is abnormal, generating fault cues information.
- 8. the device according to claim 6 or 7, it is characterised in that the processor includes：Whether the first judgment module, the maximum current of the filter inductance collected for judgement and the difference of minimum current are full Sufficient preset condition；Second judgment module, for meeting to preset when the maximum current of the filter inductance collected and the difference of minimum current During condition, whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are less than first and preset Threshold value, if so, then the filter inductance is in normal condition, if it is not, then：Whether the maximum current of the filter inductance collected described in judgement and the difference of minimum current are more than the second default threshold Value, if so, then there is exception in the filter inductance, wherein, second predetermined threshold value is more than first predetermined threshold value.
- 9. device according to claim 8, it is characterised in that the processor further includes：Computing module, for being unsatisfactory for default bar when the maximum current of the filter inductance and the difference of minimum current that collect During part, the reactance sensibility reciprocal of the filter inductance is calculated；3rd judgment module, judges whether the filter inductance is abnormal for the reactance sensibility reciprocal based on the filter inductance.
- 10. device according to claim 9, it is characterised in that the 3rd judgment module is specifically used for：Judge whether the reactance sensibility reciprocal of the filter inductance is less than reactance sensibility reciprocal preset value, if so, then the filter inductance occurs It is abnormal.
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| CN201711238379.XA CN107918058B (en) | 2017-11-30 | 2017-11-30 | Filter inductor detection method and device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714480A (en) * | 2011-03-30 | 2012-10-03 | 深圳市英威腾电气股份有限公司 | Inductance parameter identification method of synchronous motor and implementation system thereof |
| CN103250343A (en) * | 2010-12-06 | 2013-08-14 | 三菱电机株式会社 | Inductance measurement device and measurement method for synchronous electric motor |
| CN104730363A (en) * | 2013-12-20 | 2015-06-24 | 艾默生网络能源有限公司 | Filter detection method and equipment |
| CN105785173A (en) * | 2016-03-11 | 2016-07-20 | 深圳茂硕电气有限公司 | Intelligent detection apparatus for alternating-current filter inductance of inverter |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103250343A (en) * | 2010-12-06 | 2013-08-14 | 三菱电机株式会社 | Inductance measurement device and measurement method for synchronous electric motor |
| CN102714480A (en) * | 2011-03-30 | 2012-10-03 | 深圳市英威腾电气股份有限公司 | Inductance parameter identification method of synchronous motor and implementation system thereof |
| CN104730363A (en) * | 2013-12-20 | 2015-06-24 | 艾默生网络能源有限公司 | Filter detection method and equipment |
| CN105785173A (en) * | 2016-03-11 | 2016-07-20 | 深圳茂硕电气有限公司 | Intelligent detection apparatus for alternating-current filter inductance of inverter |
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