CN108828288A - A kind of intelligence Active Power Filter-APF referential current detection system - Google Patents
A kind of intelligence Active Power Filter-APF referential current detection system Download PDFInfo
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- CN108828288A CN108828288A CN201810316778.1A CN201810316778A CN108828288A CN 108828288 A CN108828288 A CN 108828288A CN 201810316778 A CN201810316778 A CN 201810316778A CN 108828288 A CN108828288 A CN 108828288A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to technical field of current detection, disclose a kind of intelligent Active Power Filter-APF referential current detection system, and the intelligence Active Power Filter-APF referential current detection system includes：Voltage acquisition module, current acquisition module, temperature collecting module, main control module, detection module, fault detection module, fault alarm module, display module.The present invention still is able to accurately detect harmonic wave in three-phase power grid voltage imbalance by detection module, and compensation effect is excellent, meanwhile, appropriate adjustment can be required to control target according to compensation, control mode is more flexible, has very strong practicability；Control target can be adjusted according to different compensation demands in unbalanced source voltage, realizes complete Harmonics elimination or unity power factor compensation；Simultaneously fault-signal can be detected by fault detection module and fault alarm module in time, staff is notified to carry out safeguard procedures.
Description
Technical field
The invention belongs to technical field of current detection more particularly to a kind of intelligent Active Power Filter-APF referential current detections
System.
Background technique
The filter circuit that power-supply filter is made of capacitor, inductance and resistance.Filter can be to specific in power supply line
Frequency other than the frequency point of frequency or the frequency point is effectively filtered out, and obtains the power supply signal of a specific frequency, or eliminate one
Power supply signal after a specific frequency.Main function filter is as its name suggests the device being filtered to wave.However, existing
Filter instructions detect in current course, and the continuous superposition accumulation of harmonic signal can cause the distortion of voltage, grid collapses
Or can equally cause the imbalance of three-phase voltage under certain specific operations, cause harmonic wave command signal to extract the accuracy of strategy
It will receive influence with precision；If checking process cannot notify staff if there is failure in time simultaneously.
In conclusion problem of the existing technology is：In existing filter instructions detection current course, harmonic signal
Constantly superposition accumulation can cause the distortion of voltage, can equally cause three-phase voltage under grid collapses or certain specific operations
Imbalance, cause harmonic wave command signal extract strategy accuracy and precision will receive influence；If checking process simultaneously
If there is failure, staff cannot be notified in time.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of intelligent Active Power Filter-APF referential current detections
System.
The invention is realized in this way a kind of intelligence Active Power Filter-APF referential current detection system includes：
Voltage acquisition module, current acquisition module, temperature collecting module, main control module, detection module, fault detection mould
Block, fault alarm module, display module；
Voltage acquisition module is connect with main control module, for acquiring mains voltage signal by voltage sensor；
Current acquisition module is connect with main control module, for acquiring load current signal by current sensor；
Temperature collecting module is connect with main control module, for acquiring Active Power Filter-APF heat dissipation by temperature sensor
Device temperature signal；
Main control module, with voltage acquisition module, current acquisition module, temperature collecting module, detection module, fault detection mould
Block, fault alarm module, display module connection, are worked normally for dispatching each electric elements；
Detection module is connect with main control module, for being detected by Active Power Filter-APF instruction to electric current；
Fault detection module is connect with main control module, fault alarm module, for being detected to circuit alarm, and will
Fault-signal sends fault alarm module to；
Fault alarm module is connect with fault detection module, for being alarmed by alarm circuit failure；
Display module is connect with main control module, for showing to Active Power Filter-APF current detecting information.
Further, the detection module detection method is as follows：
Firstly, the three-phase current and active power filtering of three-phase power grid voltage, load-side at acquisition points of common connection
The DC capacitor voltage of device；
Secondly, obtaining fundamental wave just using coordinate transformation method according to the three-phase power grid voltage at collected points of common connection
Sequence voltage signal carries out Clark transformation and Park in the three-phase phase current to points of common connection three-phase power grid voltage and load-side
Transformation, and Instantaneous Power Theory is utilized, calculate average active power pavg and active electric power filter that load is absorbed from grid side
The average loss ploss of wave device work；
Then, the processing of virtual value processing module is sent into collected points of common connection three-phase power grid voltage, constructs one
The Lagrangian objective function for meeting grid current harmonic aberration rate and the limitation of Voltage Harmonic aberration rate, by solving the mesh
Scalar functions obtain the apparent energy minimum value of Active Power Filter-APF, to acquire conductance factor Gn, and then acquire target grid
Electric current；
Then, compensation current-order can be obtained by target grid electric current and threephase load side electric current being made the difference and being negated
Value calculates the reactive power that can be obtained system and need to compensate by instruction current follow-up control circuit；
Finally, current follow-up control circuit is tracked by instruction current and is controlled to compensate current instruction value as reference signal
Circuit processed and voltage space vector modulation module obtain the driving signal of main circuit；Finally in the control of pwm pulse driving signal
Under, so that compensation electric current needed for main circuit generation system.
Further, the detection of the target grid electric current includes two parts：
First, using the extracting method based on coordinate transform and Instantaneous Power Theory, when meeting three-phase power grid voltage balance
Demand for control；
Second, when in three-phase power grid voltage unbalanced system, by after voltage on line side and compensation between current on line side
Conductance factor Gn is introduced, when according to Active Power Filter-APF steady operation, system power conserva-tion principle meets function to construct one
The Lagrangian of rate conservation and percent harmonic distortion restrictive condition；Again by solving to the function, target grid is obtained
Electric current.
Further, main control module detects the working condition of each submodule, and mainly detection voltage acquisition module is each
Whether voltage data is normal, and current acquisition module data parameters are arranged, and the data parameters of temperature collecting module are arranged, and detects failure
Whether detection module transmission channel is normal, and whether detection display module transmission channel is normal；
The data that main control module real-time collecting current acquisition module and temperature collecting module are sent back, and handled and deposited
Storage, and the data being collected into are transmitted to fault detection module and display module.
Further, fault detection module detects circuit alarm, and sends fault-signal to fault alarm module,
It specifically includes：
(1) fault detector is set in power grid, and the fault detector is distributed on the route of power grid, the route packet
Basic routing line and at least one level branched line are included, and every route is equipped at least one fault detector；
(2) it establishes using fault detector as the tree shape model of node；Failure in the tree shape model on same route refers to
Show that device is sequentially connected, child node of the latter fault detector as previous fault detector；First failure on branched line
Indicator is as first failure on the child node of the last one fault detector on basic routing line, secondary level-one branched line
Child node of the indicator as the last one fault detector on upper level branched line；
(3) fault detector is identified and is numbered；Fault detector number consecutively on same route, branched line
On first fault detector increase by 1 on the basis of the number of the last one fault detector on basic routing line；Secondary one
The number of the last one fault detector of first fault detector on upper level branched line on grade branched line
On the basis of increase by 1；
(4) traversal judges to indicate event on each paths using fault detector as all paths of the tree shape model of node
Whether the quantity of the fault detector of barrier is consistent with the number of the largest number of fault detector, if so, most by the number
Failure coordinate of the mark and number of big fault detector as the path；
(5) the maximum fault detector of number component for obtaining failure coordinate, after which by fault positioning；
(6) in the case where detecting that power distribution network breaks down, the failure in the power distribution network is shown in display module
Route, and obtain terminal corresponding to the faulty line；And fault cues message is sent to fault alarm module；
(7) fault message of the faulty line is obtained from preset interconnected system, and described in showing in display module
Fault message, wherein the fault message includes at least：Fault section, the fault section are to break down in faulty line
Position where railroad section.
Further, two test points are chosen when current acquisition module samples, at interval of time T01Sampling is primary respectively, record
Electric current i01And i02, sample n times, and by sample information and transmitting fault information to main control module；
Detection module when the first distribution terminal breaks down, on the communication line of fault point voltage, electric current with
And Power operation parameter is acquired, and is transmitted to the data processing unit, wherein when acquisition current information, the company of taking every time
Continuous N1A period samples M1It is secondary, an instantaneous value i is taken within each period；
Main control module calculates the trip information that the detection module acquires, and out of, neighbouring distribution terminal
Broadcast reference signal information is obtained, according to the failure occurs for the neighbouring distribution terminal moment, obtains current time electric current, voltage and function
Rate signal translates forward signal waveform according to the time interval t that with failure occurs for current time the moment, obtains reference signal electricity
Flow I3And reference voltage signal and reference power signal, a threshold range of trip information is calculated, and gained will be calculated
Operation information be compared with threshold range information, wherein the current signal of acquisition is calculated by following formula,
In formula, i indicates the instantaneous value in any period, Im0kIt indicates in N1Electric current average amplitude in a period, ImTable
Show calculating gained current amplitude, N1Indicate each sampling period, M1Indicate that sampling number, w indicate signal transmission frequencies；To respectively matching
After the fault message of electric terminals is determined, there are time-ofday signals to the failure that substation is sent and be acquired, after correcting process, to
Fault alarm module and display module are sent, and are modified to the signal of acquisition by following formula,
In formula, ρ indicates correction factor, i01And i02When indicating to break down, the transient current sampled value of two sampled points, N
Indicate that sampling number, k indicate sample sequence.
Advantages of the present invention and good effect are：The present invention is by detection module, still in three-phase power grid voltage imbalance
Harmonic wave so can be accurately detected, compensation effect is excellent, meanwhile, appropriate adjustment can be required to control target, control mode according to compensation
It is more flexible, there is very strong practicability；Control mesh can be adjusted according to different compensation demands in unbalanced source voltage
Mark realizes complete Harmonics elimination or unity power factor compensation；It simultaneously can by fault detection module and fault alarm module
To detect fault-signal in time, staff is notified to carry out safeguard procedures.Main control module in the present invention breaks down in circuit
When, the information that current moment can be gone out to failure is modified transmission, the acquisition of Multi sectional multicycle signal is carried out, to fault-signal
Detection it is more accurate.
Detailed description of the invention
Fig. 1 is intelligent Active Power Filter-APF referential current detection system structure diagram provided in an embodiment of the present invention.
In figure：1, voltage acquisition module；2, current acquisition module；3, temperature collecting module；4, main control module；5, mould is detected
Block；6, fault detection module；7, fault alarm module；8, display module.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows.
Structure of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, intelligence Active Power Filter-APF referential current detection system provided by the invention includes：Voltage acquisition
Module 1, current acquisition module 2, temperature collecting module 3, main control module 4, detection module 5, fault detection module 6, fault alarm
Module 7, display module 8.
Voltage acquisition module 1 is connect with main control module 4, for acquiring mains voltage signal by voltage sensor；
Current acquisition module 2 is connect with main control module 4, for acquiring load current signal by current sensor；
Temperature collecting module 3 is connect with main control module 4, is dissipated for acquiring Active Power Filter-APF by temperature sensor
Hot device temperature signal；
Main control module 4, with voltage acquisition module 1, current acquisition module 2, temperature collecting module 3, detection module 5, failure
Detection module 6, fault alarm module 7, display module 8 connect, and are worked normally for dispatching each electric elements；
Detection module 5 is connect with main control module 4, for being detected by Active Power Filter-APF instruction to electric current；
Fault detection module 6 is connect with main control module 4, fault alarm module 7, for being detected to circuit alarm, and
Send fault-signal to fault alarm module；
Fault alarm module 7 is connect with fault detection module 6, for being alarmed by alarm circuit failure；
Display module 8 is connect with main control module 4, for showing to Active Power Filter-APF current detecting information.
5 detection method of detection module provided by the invention is as follows：
Firstly, the three-phase current and active power filtering of three-phase power grid voltage, load-side at acquisition points of common connection
The DC capacitor voltage of device；
Secondly, obtaining fundamental wave just using coordinate transformation method according to the three-phase power grid voltage at collected points of common connection
Sequence voltage signal carries out Clark transformation and Park in the three-phase phase current to points of common connection three-phase power grid voltage and load-side
Transformation, and Instantaneous Power Theory is utilized, calculate average active power pavg and active electric power filter that load is absorbed from grid side
The average loss ploss of wave device work；
Then, the processing of virtual value processing module is sent into collected points of common connection three-phase power grid voltage, constructs one
The Lagrangian objective function for meeting grid current harmonic aberration rate and the limitation of Voltage Harmonic aberration rate, by solving the mesh
Scalar functions obtain the apparent energy minimum value of Active Power Filter-APF, to acquire conductance factor Gn, and then acquire target grid
Electric current；
Then, compensation current-order can be obtained by target grid electric current and threephase load side electric current being made the difference and being negated
Value calculates the reactive power that can be obtained system and need to compensate by instruction current follow-up control circuit；
Finally, current follow-up control circuit is tracked by instruction current and is controlled to compensate current instruction value as reference signal
Circuit processed and voltage space vector modulation module obtain the driving signal of main circuit；Finally in the control of pwm pulse driving signal
Under, so that compensation electric current needed for main circuit generation system.
The detection of target grid electric current provided by the invention includes two parts：
First, using the extracting method based on coordinate transform and Instantaneous Power Theory, when meeting three-phase power grid voltage balance
Demand for control；
Second, when in three-phase power grid voltage unbalanced system, by after voltage on line side and compensation between current on line side
Conductance factor Gn is introduced, when according to Active Power Filter-APF steady operation, system power conserva-tion principle meets function to construct one
The Lagrangian of rate conservation and percent harmonic distortion restrictive condition；Again by solving to the function, target grid is obtained
Electric current.
Fault detection module detects circuit alarm, and sends fault-signal to fault alarm module, specific to wrap
It includes：
(1) fault detector is set in power grid, and the fault detector is distributed on the route of power grid, the route packet
Basic routing line and at least one level branched line are included, and every route is equipped at least one fault detector；
(2) it establishes using fault detector as the tree shape model of node；Failure in the tree shape model on same route refers to
Show that device is sequentially connected, child node of the latter fault detector as previous fault detector；First failure on branched line
Indicator is as first failure on the child node of the last one fault detector on basic routing line, secondary level-one branched line
Child node of the indicator as the last one fault detector on upper level branched line；
(3) fault detector is identified and is numbered；Fault detector number consecutively on same route, branched line
On first fault detector increase by 1 on the basis of the number of the last one fault detector on basic routing line；Secondary one
The number of the last one fault detector of first fault detector on upper level branched line on grade branched line
On the basis of increase by 1；
(4) traversal judges to indicate event on each paths using fault detector as all paths of the tree shape model of node
Whether the quantity of the fault detector of barrier is consistent with the number of the largest number of fault detector, if so, most by the number
Failure coordinate of the mark and number of big fault detector as the path；
(5) the maximum fault detector of number component for obtaining failure coordinate, after which by fault positioning；
(6) in the case where detecting that power distribution network breaks down, the failure in the power distribution network is shown in display module
Route, and obtain terminal corresponding to the faulty line；And fault cues message is sent to fault alarm module；
(7) fault message of the faulty line is obtained from preset interconnected system, and described in showing in display module
Fault message, wherein the fault message includes at least：Fault section, the fault section are to break down in faulty line
Position where railroad section.
Two test points are chosen when current acquisition module samples, at interval of time T01Sampling is primary respectively, record current i01
And i02, sample n times, and by sample information and transmitting fault information to main control module；
Detection module when the first distribution terminal breaks down, on the communication line of fault point voltage, electric current with
And Power operation parameter is acquired, and is transmitted to the data processing unit, wherein when acquisition current information, the company of taking every time
Continuous N1A period samples M1It is secondary, an instantaneous value i is taken within each period；
Main control module calculates the trip information that the detection module acquires, and out of, neighbouring distribution terminal
Broadcast reference signal information is obtained, according to the failure occurs for the neighbouring distribution terminal moment, obtains current time electric current, voltage and function
Rate signal translates forward signal waveform according to the time interval t that with failure occurs for current time the moment, obtains reference signal electricity
Flow I3And reference voltage signal and reference power signal, a threshold range of trip information is calculated, and gained will be calculated
Operation information be compared with threshold range information, wherein the current signal of acquisition is calculated by following formula,
In formula, i indicates the instantaneous value in any period, Im0kIt indicates in N1Electric current average amplitude in a period, ImTable
Show calculating gained current amplitude, N1Indicate each sampling period, M1Indicate that sampling number, w indicate signal transmission frequencies；To respectively matching
After the fault message of electric terminals is determined, there are time-ofday signals to the failure that substation is sent and be acquired, after correcting process, to
Fault alarm module and display module are sent, and are modified to the signal of acquisition by following formula,
In formula, ρ indicates correction factor, i01And i02When indicating to break down, the transient current sampled value of two sampled points, N
Indicate that sampling number, k indicate sample sequence.
The data information of acquisition is sent to by voltage acquisition module 1 of the present invention, current acquisition module 2, temperature collecting module 3
Main control module 4 carries out processing analysis, and dispatches；Detection module 5 detects electric current by Active Power Filter-APF instruction；Such as
Fruit circuit abnormality detects circuit alarm by fault detection module 6, and sends fault-signal to fault alarm module
7 alarm；Finally, being shown by display module 8 to Active Power Filter-APF current detecting information.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (6)
1. a kind of intelligence Active Power Filter-APF referential current detection system, which is characterized in that the intelligence active power filtering
Device referential current detection system includes：
Voltage acquisition module, current acquisition module, temperature collecting module, main control module, detection module, fault detection module, event
Hinder alarm module, display module；
Voltage acquisition module is connect with main control module, for acquiring mains voltage signal by voltage sensor；
Current acquisition module is connect with main control module, for acquiring load current signal by current sensor；
Temperature collecting module is connect with main control module, for acquiring Active Power Filter-APF radiator temperature by temperature sensor
Spend signal；
Main control module, with voltage acquisition module, current acquisition module, temperature collecting module, detection module, fault detection module,
Fault alarm module, display module connection, are worked normally for dispatching each electric elements；
Detection module is connect with main control module, for being detected by Active Power Filter-APF instruction to electric current；
Fault detection module is connect with main control module, fault alarm module, for detecting to circuit alarm, and by failure
Signal sends fault alarm module to；
Fault alarm module is connect with fault detection module, for being alarmed by alarm circuit failure；
Display module is connect with main control module, for showing to Active Power Filter-APF current detecting information.
2. intelligence Active Power Filter-APF referential current detection system as described in claim 1, which is characterized in that the detection mould
Block detection method is as follows：
Firstly, the three-phase phase current and Active Power Filter-APF of three-phase power grid voltage, load-side at acquisition points of common connection
DC capacitor voltage；
Secondly, obtaining fundamental positive sequence electricity using coordinate transformation method according to the three-phase power grid voltage at collected points of common connection
Signal is pressed, in the three-phase phase current to points of common connection three-phase power grid voltage and load-side, Clark transformation is carried out and Park becomes
It changes, and utilizes Instantaneous Power Theory, calculate average active power pavg and active power filtering that load is absorbed from grid side
The average loss ploss of device work；
Then, the processing of virtual value processing module is sent into collected points of common connection three-phase power grid voltage, constructs a satisfaction
The Lagrangian objective function of grid current harmonic aberration rate and the limitation of Voltage Harmonic aberration rate, by solving the target letter
Number obtains the apparent energy minimum value of Active Power Filter-APF, to acquire conductance factor Gn, and then acquires target grid electric current；
Then, compensation current instruction value, warp can be obtained by target grid electric current and threephase load side electric current being made the difference and being negated
The reactive power that system needs to compensate can be obtained by crossing the calculating of instruction current follow-up control circuit；
Finally, current follow-up control circuit passes through instruction current tracing control electricity to compensate current instruction value as reference signal
Road and voltage space vector modulation module obtain the driving signal of main circuit；Finally under the control of pwm pulse driving signal, make
Compensation electric current needed for obtaining main circuit generation system.
3. intelligence Active Power Filter-APF referential current detection system as claimed in claim 2, which is characterized in that the target electricity
The detection of net electric current includes two parts：
First, using the extracting method based on coordinate transform and Instantaneous Power Theory, control when meeting three-phase power grid voltage balance
Demand；
Second, in three-phase power grid voltage unbalanced system, by being introduced between current on line side after voltage on line side and compensation
Conductance factor Gn, when according to Active Power Filter-APF steady operation, system power conserva-tion principle meets power constructing one and keeps
Permanent and percent harmonic distortion restrictive condition Lagrangian；Again by solving to the function, target grid electric current is obtained.
4. intelligence Active Power Filter-APF referential current detection system as described in claim 1, which is characterized in that main control module inspection
The working condition of each submodule is surveyed, whether each voltage data of mainly detection voltage acquisition module is normal, and electric current is arranged
The data parameters of temperature collecting module are arranged in acquisition module data parameters, and whether detection fault detection module transmission channel is normal,
Whether normal detect display module transmission channel；
The data that main control module real-time collecting current acquisition module and temperature collecting module are sent back, and handled and stored,
And the data being collected into are transmitted to fault detection module and display module.
5. intelligence Active Power Filter-APF referential current detection system as described in claim 1, which is characterized in that fault detection mould
Block detects circuit alarm, and sends fault-signal to fault alarm module, specifically includes：
(1) fault detector is set in power grid, and the fault detector is distributed on the route of power grid, and the route includes master
Main line and at least one level branched line, and every route is equipped at least one fault detector；
(2) it establishes using fault detector as the tree shape model of node；Fault detector in the tree shape model on same route
It is sequentially connected, child node of the latter fault detector as previous fault detector；First indicating fault on branched line
Device is as first indicating fault on the child node of the last one fault detector on basic routing line, secondary level-one branched line
Child node of the device as the last one fault detector on upper level branched line；
(3) fault detector is identified and is numbered；Fault detector number consecutively on same route, on branched line
First fault detector increases by 1 on the basis of the number of the last one fault detector on basic routing line；A secondary fraction
The basis of the number of the last one fault detector of first fault detector on upper level branched line on branch line
It is upper to increase by 1；
(4) traversal judges to indicate failure on each paths using fault detector as all paths of the tree shape model of node
Whether the quantity of fault detector is consistent with the number of the largest number of fault detector, if so, by described the largest number of
Failure coordinate of the mark and number of fault detector as the path；
(5) the maximum fault detector of number component for obtaining failure coordinate, after which by fault positioning；
(6) in the case where detecting that power distribution network breaks down, the faulty line in the power distribution network is shown in display module,
And obtain terminal corresponding to the faulty line；And fault cues message is sent to fault alarm module；
(7) fault message of the faulty line is obtained from preset interconnected system, and shows the failure in display module
Information, wherein the fault message includes at least：Fault section, the fault section are the position broken down in faulty line
Railroad section where setting.
6. intelligence Active Power Filter-APF referential current detection system as described in claim 1, which is characterized in that current acquisition mould
Two test points are chosen when block samples, at interval of time T01Sampling is primary respectively, record current i01And i02, n times are sampled, and will
Sample information and transmitting fault information are to main control module；
Detection module is when the first distribution terminal breaks down, to voltage, electric current and the function on the communication line of fault point
Rate operating parameter is acquired, and is transmitted to the main control module, wherein when acquisition current information, takes continuous N every time1It is a
Period samples M1It is secondary, an instantaneous value i is taken within each period；
Main control module calculates the trip information that the detection module acquires, and obtains out of neighbouring distribution terminal
According to the failure occurs for broadcast reference signal information, the neighbouring distribution terminal moment, obtains current time electric current, voltage and power letter
Number, signal waveform is translate forward according to the time interval t that with failure occurs for current time the moment, obtains reference signal electric current
I3And reference voltage signal and reference power signal, a threshold range of trip information is calculated, and will calculate resulting
Operation information is compared with threshold range information, wherein the current signal of acquisition calculated by following formula,
In formula, i indicates the instantaneous value in any period, Im0kIt indicates in N1Electric current average amplitude in a period, ImIndicate meter
Calculate gained current amplitude, N1Indicate each sampling period, M1Indicate that sampling number, w indicate signal transmission frequencies；It is whole to each distribution
After the fault message at end is determined, there are time-ofday signals to the failure that substation is sent and be acquired, after correcting process, to failure
Alarm module and display module are sent, and are modified to the signal of acquisition by following formula,
In formula, ρ indicates correction factor, i01And i02When indicating to break down, the transient current sampled value of two sampled points, N is indicated
Sampling number, k indicate sample sequence.
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| CN112327235A (en) * | 2020-09-23 | 2021-02-05 | 广州智光电气技术有限公司 | Current transformer fault detection method and device, electronic equipment and storage medium |
| CN114676538A (en) * | 2022-04-01 | 2022-06-28 | 昂顿科技（上海）有限公司 | Intelligent active filter system |
| CN114814443A (en) * | 2022-06-29 | 2022-07-29 | 陕西中测智能科技有限公司 | Multifunctional detection system for electric heating belt of heat preservation pipe |
| CN117713087A (en) * | 2023-12-22 | 2024-03-15 | 东莞市开关厂有限公司 | Intelligent filtering system of active filter |
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| CN117713087A (en) * | 2023-12-22 | 2024-03-15 | 东莞市开关厂有限公司 | Intelligent filtering system of active filter |
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