CN104345217B - Detection method and device for capacitance value - Google Patents
Detection method and device for capacitance value Download PDFInfo
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- CN104345217B CN104345217B CN201310335425.3A CN201310335425A CN104345217B CN 104345217 B CN104345217 B CN 104345217B CN 201310335425 A CN201310335425 A CN 201310335425A CN 104345217 B CN104345217 B CN 104345217B
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Abstract
The invention discloses a detection method and device of the capacitance value of a filter in an electrical-power conversion system so that a problem that in the prior electrical-power conversion system, the capacitance value in a filter cannot be detected. The method includes the following steps: controlling an output switch in the electrical-power conversion system to switch off and controlling a converter of the electrical-power conversion system to output a preset voltage; obtaining a current instantaneous value which is monitored by a current sensor of the electrical-power conversion system in a real-time manner; when the output switch of the electrical-power conversion system is switched off, the current monitored by the current sensor being the capacitive current of the filter; and based on the current instantaneous value monitored by the current sensor of the electrical-power conversion system in a real-time manner, determining whether the capacitance value of the filter is normal.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of capacitor's capacity of electric power coversion system median filter
Detection method and device.
Background technology
As the regenerative resources such as the development of science and technology, wind energy, solar energy are increasingly paid close attention to by people.Wind-power electricity generation
The generating equipments such as machine, solar panel are exported to electric power coversion system after wind energy, solar energy etc. are converted to into unidirectional current, by
Electric power coversion system is processed the unidirectional current that generating equipment is exported, and to be generated and access electrical network after the alternating current with synchronized.
The structure of electric power coversion system is as shown in figure 1, including changer 101, current sensor 102, filter in prior art
Ripple device 103, output switch 104, voltage sensor 105 and controller 106, in electric power coversion system normal work, output is opened
Close 104 to close, changer 101 is used to for the unidirectional current that generating equipment is exported to be converted to exchange electricity output, and current sensor 102 is used
In the output current of real-time monitoring changer 101, voltage sensor 105 is used for real-time monitoring line voltage, and controller 106 is used for
Changer 101 and output switch 104 are controlled according to the output current and line voltage of the changer 101 for monitoring, by
The substantial amounts of switching device in changer 101, it will cause occur high-frequency harmonic in circuit, affects the quality of power supply, it is therefore desirable to
Wave filter 103 is arranged in electric power coversion system to be used to filter high-frequency harmonic, wave filter 103 be specifically as follows LC wave filter or
LCL filter, the inductance inductance value and capacitor's capacity in wave filter 103 directly affects the filter effect of wave filter 103, it is therefore desirable to
Inductance inductance value and capacitor's capacity in wave filter 103 is detected, determines if there is exception.
In normal operation, the electric current that current sensor 102 is real-time monitored also is wave filter to existing electric power coversion system
Inductive current in 103, the voltage that voltage sensor 105 is real-time monitored also is the voltage of the inductance one end in wave filter 103,
According to current sensor 102 and the Monitoring Data of voltage sensor 105, by calculating the inductance that can be obtained in wave filter 103
Inductance value, determines if normal；But existing electric power coversion system is in normal operation, it is impossible to obtain the electricity in wave filter 103
Capacitance current, it is impossible to detect to the capacitor's capacity of wave filter 103, determines if normal.
The content of the invention
The embodiment of the present invention provides a kind of detection method and device of capacitor's capacity, to solve existing electric power coversion system
In the problem that the capacitor's capacity of wave filter cannot be detected.
A kind of detection method of the capacitor's capacity of electric power coversion system median filter provided in an embodiment of the present invention, including：
The output switch for controlling the electric power coversion system disconnects, and the changer of the control electric power coversion system is defeated
Go out predeterminated voltage；
Obtain the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored；In the electrical power conversion
When the output switch of system disconnects, the electric current of the current sensor monitoring is the capacitance current of the wave filter；
Based on the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, the wave filter is determined
Capacitor's capacity it is whether normal.
A kind of detection means of the capacitor's capacity of electric power coversion system median filter provided in an embodiment of the present invention, including：
Control unit, the output switch for controlling the electric power coversion system disconnects, and controls the electrical power conversion
The changer output predeterminated voltage of system；
Acquiring unit, the current instantaneous value that the current sensor for obtaining the electric power coversion system is real-time monitored；
When the output switch of the electric power coversion system disconnects, the electric current of the current sensor monitoring is the electric capacity of the wave filter
Electric current；
Determining unit, for the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system,
Determine whether the capacitor's capacity of the wave filter is normal.
Beneficial effects of the present invention include：
In scheme provided in an embodiment of the present invention, the output switch for controlling electric power coversion system disconnects, and controls electric power turn
The changer output predeterminated voltage of system is changed, now, the electric current that current sensor is monitored is the capacitance current of wave filter, base
In the current instantaneous value that current sensor is real-time monitored, it may be determined that whether the capacitor's capacity of wave filter is normal, can not change
Become existing electric power coversion system structure, realize detecting the capacitor's capacity of wave filter.
Description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for description, with present invention enforcement
Example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the structural representation of electric power coversion system in this prior art；
Fig. 2 is the detection method flow chart of capacitor's capacity provided in an embodiment of the present invention；
Fig. 3 is the detection method detail flowchart of the capacitor's capacity that the embodiment of the present invention 1 is provided；
Fig. 4 is the detection method detail flowchart of the capacitor's capacity that the embodiment of the present invention 2 is provided；
Fig. 5 is the schematic diagram of the detection means of capacitor's capacity provided in an embodiment of the present invention.
Specific embodiment
In order to provide the implementation detected to the capacitor's capacity of existing electric power coversion system median filter, the present invention
Embodiment provides a kind of detection method and device of capacitor's capacity, and the preferred embodiments of the present invention are entered with reference to Figure of description
Row explanation, it will be appreciated that preferred embodiment described herein is merely to illustrate and explains the present invention, is not used to limit this
It is bright.And in the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.
The embodiment of the present invention provides a kind of detection method of capacitor's capacity, as shown in Fig. 2 including：
Step 201, the output switch of control electric power coversion system disconnect, and the changer for controlling the electric power coversion system
Output predeterminated voltage；
Step 202, obtain the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored；In the electric power
When the output switch of converting system disconnects, the electric current of the current sensor monitoring is the capacitance current of the wave filter；
Step 203, the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system, it is determined that filtering
Whether the capacitor's capacity of device is normal.
The detection method of above-mentioned capacitor's capacity is applied to the detection of the capacitor's capacity of electric power coversion system median filter, filtering
Device can be LC wave filter, or LCL filter.
The detection method of capacitor's capacity provided in an embodiment of the present invention can also include obtaining the electricity of the electric power coversion system
The instantaneous voltage that pressure sensor is real-time monitored；When the output switch of the electric power coversion system disconnects, the electrical power conversion system
The voltage of the voltage sensor senses of system is the capacitance voltage of the wave filter.
Further, step 203, the current instantaneous value real-time monitored based on current sensor determines the electric capacity of wave filter
Whether capacitance is normal, can be with using the following two kinds mode：
The electricity that mode one, the instantaneous voltage and current sensor that are real-time monitored based on voltage sensor are real-time monitored
Stream instantaneous value, determines the capacitor's capacity of the wave filter；When the capacitor's capacity of the wave filter is located in the range of default capacitance, it is determined that
The capacitor's capacity of the wave filter is normal；When the capacitor's capacity of the wave filter is not located in the range of default capacitance, the filtering is determined
The capacitor's capacity exception of device；The default capacitance scope sets according to the normal capacitor's capacity of the wave filter；
Mode two, the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system, determine the filter
The capacitance current virtual value of ripple device；When the capacitance current virtual value of the wave filter is located in the range of predetermined current, the filter is determined
The capacitor's capacity of ripple device is normal；When the capacitance current virtual value of the wave filter is not located in the range of predetermined current, the filter is determined
The capacitor's capacity exception of ripple device；The predetermined current scope is normal according to the predeterminated voltage of changer output and the wave filter
Capacitor's capacity setting.
Further, aforesaid way one is specifically as follows：
The instantaneous voltage real-time monitored based on voltage sensor, determines capacitance voltage frequency and the filter of the wave filter
The capacitance voltage virtual value of ripple device；And the current instantaneous value real-time monitored based on current sensor, determine the wave filter
Capacitance current virtual value；Based on a determination that the capacitance voltage frequency of the wave filter, the capacitance voltage virtual value of the wave filter and should
The capacitance current virtual value of wave filter, determines the capacitor's capacity of the wave filter.
Aforesaid way one can also be specifically：
The instantaneous voltage real-time monitored based on voltage sensor, determines the capacitance voltage virtual value of the wave filter；With
And the current instantaneous value real-time monitored based on current sensor, determine the capacitance current frequency and the wave filter of the wave filter
Capacitance current virtual value；Based on a determination that the capacitance current frequency of the wave filter, the capacitance voltage virtual value of the wave filter and should
The capacitance current virtual value of wave filter, determines the capacitor's capacity of the wave filter.
Due to the capacitance voltage frequency of the wave filter and the capacitance current frequency of the wave filter it is identical, so using above-mentioned two
The capacitor's capacity of the wave filter that the mode of kind is determined is also identical.
The testing process preferably can be performed when electric power coversion system is started shooting, it is also possible to shut down in electric power coversion system
The Shi Zhihang testing processes.
The executive agent of the testing process can be independent device, or the control in existing electric power coversion system
Device.
Below in conjunction with the accompanying drawings, the method that the present invention is provided is described in detail with specific embodiment.
Embodiment 1：
In the embodiment of the present invention 1, the capacitor's capacity of electric power coversion system median filter is first determined, then determine the filtering
Whether the capacitor's capacity of device is normal.
Fig. 3 is that the detection method of the capacitor's capacity of the electric power coversion system median filter that the embodiment of the present invention 1 is provided is detailed
Flow chart, specifically includes：
Step 301, the controller of electric power coversion system are received after power-on command, perform start conventional sense, are judged out
Whether machine conventional sense result is normal.
In prior art, the controller of electric power coversion system can perform the conventional inspection of start after power-on command is received,
Survey, only can just start changer after it is determined that start conventional sense result is normal and enter working condition.
Start conventional sense can specifically include the output switch closure of control electric power coversion system, using electrical network to electric power
Electric capacity charges between the dc bus of the changer of converting system, and charging current and DC bus-bar voltage are detected, it is also possible to
Also include other detection projects.
When conventional sense result of starting shooting is normal, into step 302；When conventional sense result of starting shooting has abnormal, enter
Enter step 309.
Step 302, the output switch of control electric power coversion system disconnect.
After output switch disconnects, the circuit between wave filter and rear end equipment is in open-circuit condition, and no matter wave filter is adopted
It is LC wave filter, or LCL filter, the electric capacity in wave filter is ground capacity, therefore the electricity of electric power coversion system
The voltage that pressure sensor is monitored is the capacitance voltage of wave filter, and the magnitude of voltage that voltage sensor is real-time monitored is wave filter
Capacitance voltage instantaneous value；And now, flow through electric current also due to the disconnection of rear end equipment, does not constitute other current branch
The electric current of sensor is the electric current for flowing through electric capacity in wave filter, therefore the electricity that the current sensor of electric power coversion system is monitored
Stream is the capacitance current of wave filter, and the current value that current sensor is real-time monitored is the capacitance current instantaneous value of wave filter.
However, can not directly determine that the electric capacity of wave filter holds according to capacitance voltage instantaneous value and capacitance current instantaneous value
Value, the capacitor's capacity of wave filter is needed based on capacitance voltage virtual value, capacitance current virtual value and capacitance voltage frequency/electric capacity
Power frequency determines that the electric capacity for needing wave filter has stable capacitance voltage and stable capacitance current, it is therefore desirable to perform
Following step 303, the electric capacity for making wave filter has stable capacitance voltage and stable capacitance current.
Step 303, control changer output predeterminated voltage.
Predeterminated voltage is a burning voltage with default amplitude and predeterminated frequency.
After start conventional sense process terminates, there is certain voltage on the electric capacity of wave filter, therefore in order to avoid becoming
There is voltge surge after parallel operation output predeterminated voltage, preferably, can export specifically to control changer using the following two kinds mode
Predeterminated voltage：
Mode one：The instantaneous voltage real-time monitored based on voltage sensor, the capacitance voltage for determining the wave filter is worked as
Front phase place；The current phase place identical predeterminated voltage of capacitance voltage of control changer output phase and wave filter；
Mode two：Control the finger that changer output frequency is identical with predeterminated voltage frequency, amplitude is less than predeterminated voltage amplitude
Determine voltage, and control the amplitude that the amplitude of given voltage gradually increases to predeterminated voltage.
In the detection process for carrying out capacitor's capacity, the input voltage of changer can be provided by electric capacity between dc bus,
Can also be provided by front end generating equipment, it is also possible to provided by other power supplys, here is not especially limited.
The instantaneous voltage that step 304, acquisition voltage sensor are real-time monitored, is real-time monitored based on voltage sensor
Instantaneous voltage, determine capacitance voltage frequency f of wave filter and capacitance voltage virtual value U of wave filter.
The instantaneous voltage real-time monitored based on voltage sensor, specifically can determine that the capacitance voltage ripple of wave filter
Shape, and then can determine that capacitance voltage frequency f of wave filter.
Based on a determination that the capacitance voltage waveform of the wave filter for going out, it may also be determined that going out voltage peak Um, according to formulaCapacitance voltage virtual value U of wave filter can be calculated.
The computational methods of capacitance voltage virtual value U of above-mentioned wave filter are only an example, in other enforcements of the present invention
In example, it would however also be possible to employ the alternate manner of prior art calculates capacitance voltage virtual value U of wave filter.
And the capacitance voltage waveform of the wave filter by determining, may also correct for the output of changer, make controller defeated
Go out predeterminated voltage.
The current instantaneous value that step 305, acquisition current sensor are real-time monitored, is real-time monitored based on current sensor
Current instantaneous value, determine capacitance current virtual value I of wave filter.
The current instantaneous value real-time monitored based on current sensor, specifically can determine that the capacitance current ripple of wave filter
Shape, and then determine current peak Im, according to formulaCapacitance current virtual value I of wave filter can be calculated.
The computational methods of capacitance current virtual value I of above-mentioned wave filter are only an example, in other enforcements of the present invention
In example, it would however also be possible to employ the alternate manner of prior art calculates capacitance current virtual value I of wave filter.
The priority execution sequence of above-mentioned steps 304 and step 305 without certainty, in other embodiments of the invention,
Step 305 can be first carried out, after the capacitance current virtual value for determining wave filter, then execution step 304, determine wave filter
The capacitance voltage virtual value of capacitance voltage frequency and wave filter, it is also possible to while execution step 304 and step 305.
Step 306, based on a determination that capacitance voltage frequency f of wave filter, capacitance voltage virtual value U and capacitance current it is effective
Value I, determines the capacitor's capacity of wave filter.
Determine the capacitor's capacity of wave filter with specific reference to formula I=2 π fCU, wherein C is the capacitor's capacity of wave filter.
In other embodiments of the invention, it is also possible to the current instantaneous value real-time monitored based on current sensor, really
Determine the capacitance current frequency of wave filter, capacitance current frequency is identical with capacitance voltage frequency, based on a determination that wave filter electric capacity
Power frequency, capacitance voltage virtual value and capacitance current virtual value, it is also possible to determine the capacitor's capacity of wave filter.
Step 307, judge that whether the capacitor's capacity of wave filter is located in the range of default capacitance.
When it is determined that the capacitor's capacity of wave filter is located in the range of default capacitance, determine that the capacitor's capacity of wave filter is normal,
Into step 308；When it is determined that the capacitor's capacity of wave filter is not located in the range of default capacitance, the capacitor's capacity of wave filter is determined
It is abnormal, into step 309.
Wherein, preset capacitance scope to be set according to the normal capacitor's capacity of wave filter.
Step 308, controlled output switch closure, into normal boot-strap flow process.
The flow process terminates.
Step 309, disorderly closedown.
Fault warning can now be sent to point out user.
It can be seen that, the such scheme provided using the embodiment of the present invention 1, the structure without the need for changing existing electric power coversion system,
The capacitor's capacity of wave filter is capable of determining that, exception is determined if, and then improves the reliability of electric power coversion system.
In other embodiments of the invention, the detecting step of the capacitor's capacity in the method that above-described embodiment 1 is provided, i.e.,
Step 302- step 307 can also be performed after the controller of electric power coversion system receives halt command.When it is determined that wave filter
Capacitor's capacity when being located in the range of default capacitance, determine that the capacitor's capacity of wave filter is normal, now orderly closedown；When it is determined that filter
When the capacitor's capacity of ripple device is not located in the range of default capacitance, the capacitor's capacity exception of wave filter is determined, now disorderly closedown, send out
Go out alarm.
Above-described embodiment 1 be after the capacitor's capacity of wave filter of electric power coversion system is determined, then come judge electric capacity hold
Whether value is normal.And the normal capacitor's capacity of the predeterminated voltage and wave filter according to changer output can also be precomputed
The capacitance current of one wave filter, the capacitance current is and exports predeterminated voltage in changer, and the capacitor's capacity of wave filter is normal
When the capacitance current that should have of wave filter, a predetermined current scope can be set as capacitance current just according to the capacitance current
Scope when often.When output switch disconnection, changer in electric power coversion system exports predeterminated voltage, detection filter can be passed through
Whether the whether normal capacitor's capacity to judge wave filter of the capacitance current of device is normal, sees below embodiment 2.
Embodiment 2：
Fig. 4 is that the detection method of the capacitor's capacity of the electric power coversion system median filter that the embodiment of the present invention 2 is provided is detailed
Flow chart, specifically includes：
Step 401, the controller of electric power coversion system are received after power-on command, perform start conventional sense, are judged out
Whether machine conventional sense result is normal.
When conventional sense result of starting shooting is normal, into step 402；When conventional sense result of starting shooting has abnormal, enter
Enter step 407.
Step 402, the output switch of control electric power coversion system disconnect.
Step 403, control changer output predeterminated voltage.
Above-mentioned steps 401- step 403 is identical with step 301- step 303 in embodiment 1, will not be described here.
The current instantaneous value that step 404, acquisition current sensor are real-time monitored, is real-time monitored based on current sensor
Current instantaneous value, determine the capacitance current virtual value of wave filter.
After output switch disconnects, the electric current that current sensor is monitored is the capacitance current of wave filter.
The current instantaneous value real-time monitored based on current sensor, specifically can determine the capacitance current ripple of wave filter
Shape, by calculating the capacitance current virtual value that can draw wave filter.
Step 405, judge that whether the capacitance current virtual value of wave filter is located in the range of predetermined current.
When it is determined that the capacitance current virtual value of wave filter is located in the range of predetermined current, the electric capacity for determining the wave filter holds
Value is normal, into step 406；When it is determined that the capacitance current virtual value of wave filter is not located in the range of predetermined current, it is determined that should
The capacitor's capacity exception of wave filter, into step 407.
Step 406, controlled output switch closure, into normal boot-strap flow process.
The flow process terminates.
Step 407, disorderly closedown.
It can be seen that, the such scheme provided using the embodiment of the present invention 2, the structure without the need for changing existing electric power coversion system,
Without the capacitor's capacity for determining wave filter, just can determine that whether capacitor's capacity is normal, realizes in electric power coversion system
The detection of the capacitor's capacity of wave filter.
In other embodiments of the invention, the detecting step of the capacitor's capacity in the method that above-described embodiment 2 is provided, i.e.,
Step 402- step 405 can also be performed after the controller of electric power coversion system receives halt command.When it is determined that wave filter
Capacitance current virtual value when being located in the range of predetermined current, determine that the capacitor's capacity of the wave filter is normal, now orderly closedown；
When it is determined that the capacitance current virtual value of wave filter is not located in the range of predetermined current, determine that the capacitor's capacity of the wave filter is different
Often, now disorderly closedown, sends alarm.
Based on same inventive concept, the electric capacity of the electric power coversion system median filter provided according to the above embodiment of the present invention
The detection method of capacitance, correspondingly, the embodiment of the present invention also provides a kind of capacitor's capacity of electric power coversion system median filter
Detection means, its structural representation is as shown in figure 5, specifically include：
Control unit 501, the output switch for controlling electric power coversion system disconnects, and controls the electric power coversion system
Changer output predeterminated voltage；
Acquiring unit 502, the current instantaneous value that the current sensor for obtaining the electric power coversion system is real-time monitored；
When the output switch of the electric power coversion system disconnects, the electric current of the current sensor monitoring is the capacitance current of the wave filter；
Determining unit 503, for the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system,
Determine whether the capacitor's capacity of wave filter is normal.
Further, acquiring unit 502, the voltage sensor for being additionally operable to obtain the electric power coversion system is real-time monitored
Instantaneous voltage；When the output switch of the electric power coversion system disconnects, the voltage of the voltage sensor senses is the wave filter
Capacitance voltage；
Determining unit 503, specifically for the voltage wink real-time monitored based on the voltage sensor of the electric power coversion system
The current instantaneous value that the current sensor of duration and the electric power coversion system is real-time monitored, the electric capacity for determining the wave filter holds
Value；When the capacitor's capacity of the wave filter is located in the range of default capacitance, determine that the capacitor's capacity of the wave filter is normal.
Further, determining unit 503, specifically for the current sensor real-time monitoring based on the electric power coversion system
The current instantaneous value for arriving, determines the capacitance current virtual value of the wave filter；When the capacitance current virtual value of the wave filter is located in advance
If when in current range, determining that the capacitor's capacity of the wave filter is normal；The predetermined current scope is pre- according to the changer output
If the normal capacitor's capacity setting of voltage and the wave filter.
Further, determining unit 503, specifically for the voltage sensor real-time monitoring based on the electric power coversion system
The instantaneous voltage for arriving, determines the capacitance voltage frequency of the wave filter and the capacitance voltage virtual value of the wave filter；And be based on
The current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, determines that the capacitance current of the wave filter is effective
Value；Based on a determination that the capacitance voltage frequency of the wave filter, the capacitance voltage virtual value of the wave filter and the electric capacity of the wave filter
Current effective value, determines the capacitor's capacity of the wave filter；
Or, the determining unit 503, specifically for what is real-time monitored based on the voltage sensor of the electric power coversion system
Instantaneous voltage, determines the capacitance voltage virtual value of the wave filter；And the current sensor reality based on the electric power coversion system
When the current instantaneous value that monitors, determine the capacitance current frequency of the wave filter and the capacitance current virtual value of the wave filter；Base
In it is determined that the capacitance current of the capacitance current frequency of the wave filter, the capacitance voltage virtual value of the wave filter and the wave filter have
Valid value, determines the capacitor's capacity of the wave filter.
Further, control unit 501, specifically for the voltage sensor real-time monitoring based on the electric power coversion system
The instantaneous voltage for arriving, determines the current phase place of capacitance voltage of the wave filter；Control the changer output of the electric power coversion system
The current phase place identical predeterminated voltage of capacitance voltage of phase place and the wave filter；
Or, the control unit 501, the changer output frequency and default electricity specifically for controlling the electric power coversion system
Voltage-frequency rate is identical, amplitude less than the given voltage of the predeterminated voltage amplitude, and control the amplitude of the given voltage and gradually increase to
The amplitude of the predeterminated voltage.
The function of above-mentioned each unit may correspond to the respective handling step in the arbitrary shown flow processs of Fig. 2-Fig. 4, and here is no longer
Repeat.
The capacitor's capacity detection means that embodiments herein is provided can be realized by computer program.Art technology
Personnel it should be appreciated that above-mentioned dividing elements mode is only the one kind in plurality of cells dividing mode, if being divided into it
His unit or without inner cells, as long as detection means has above-mentioned functions, all should be within the protection domain of the application.
In sum, scheme provided in an embodiment of the present invention, including：The output switch of control electric power coversion system disconnects,
And control the electric power coversion system changer output predeterminated voltage；Current sensor based on the electric power coversion system is real-time
The current instantaneous value for monitoring, determines whether the capacitor's capacity of wave filter is normal；Break in the output switch of the electric power coversion system
When opening, the electric current of the current sensor monitoring is the capacitance current of the wave filter.Using scheme provided in an embodiment of the present invention, energy
Enough capacitor's capacities to existing electric power coversion system median filter are detected.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of detection method of the capacitor's capacity of electric power coversion system median filter, it is characterised in that include：
The output switch for controlling the electric power coversion system disconnects, and the changer output of the control electric power coversion system is pre-
If voltage；
Obtain the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored；In the electric power coversion system
Output switch when disconnecting, the electric current of current sensor monitoring is the capacitance current of the wave filter；
Based on the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Whether normal hold capacitance.
2. the detection method of the capacitor's capacity of electric power coversion system median filter as claimed in claim 1, it is characterised in that also
Including：
Obtain the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored；In the electric power coversion system
Output switch disconnect when, the voltage of the voltage sensor senses is the capacitance voltage of the wave filter；
Based on the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Whether normal hold capacitance, specifically include：
The instantaneous voltage real-time monitored based on the voltage sensor of the electric power coversion system and the electric power coversion system
The current instantaneous value that real-time monitors of current sensor, determine the capacitor's capacity of the wave filter；When the electricity of the wave filter
When holding capacitance in the range of default capacitance, determine that the capacitor's capacity of the wave filter is normal.
3. the detection method of the capacitor's capacity of electric power coversion system median filter as claimed in claim 1, it is characterised in that base
In the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, the capacitor's capacity of the wave filter is determined
It is whether normal, specifically include：
Based on the current instantaneous value that the current sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Capacitance current virtual value；
When the capacitance current virtual value of the wave filter is located in the range of predetermined current, the capacitor's capacity of the wave filter is determined
Normally；The predeterminated voltage and the normal electric capacity of the wave filter that the predetermined current scope is exported according to the changer holds
Value setting.
4. the detection method of the capacitor's capacity of electric power coversion system median filter as claimed in claim 2, it is characterised in that base
The instantaneous voltage real-time monitored in the voltage sensor of the electric power coversion system and the electric current of the electric power coversion system
The current instantaneous value that sensor is real-time monitored, determines the capacitor's capacity of the wave filter, specially：
Based on the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Hold the capacitance voltage virtual value of electric voltage frequency and the wave filter；And the current sensor reality based on the electric power coversion system
When the current instantaneous value that monitors, determine the capacitance current virtual value of the wave filter；Based on a determination that the wave filter electricity
Hold the capacitance current virtual value of electric voltage frequency, the capacitance voltage virtual value of the wave filter and the wave filter, determine the filter
The capacitor's capacity of ripple device；Or
Based on the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Hold voltage effective value；And the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system, it is determined that
The capacitance current frequency of the wave filter and the capacitance current virtual value of the wave filter；Based on a determination that the wave filter electricity
The capacitance current virtual value of capacitance current frequency, the capacitance voltage virtual value of the wave filter and the wave filter, determines the filter
The capacitor's capacity of ripple device.
5. the detection method of the capacitor's capacity of the electric power coversion system median filter as described in claim 1-4 is arbitrary, its feature
It is the changer output predeterminated voltage for controlling the electric power coversion system, specially：
Based on the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Hold the current phase place of voltage；Control the electric power coversion system changer output phase and the wave filter capacitance voltage it is current
Phase place identical predeterminated voltage；Or
The changer output frequency that controls the electric power coversion system is identical with predeterminated voltage frequency, amplitude is less than the default electricity
The given voltage of pressure amplitude value, and control the amplitude that the amplitude of the given voltage gradually increases to the predeterminated voltage.
6. a kind of detection means of the capacitor's capacity of electric power coversion system median filter, it is characterised in that include：
Control unit, the output switch for controlling the electric power coversion system disconnects, and controls the electric power coversion system
Changer output predeterminated voltage；
Acquiring unit, the current instantaneous value that the current sensor for obtaining the electric power coversion system is real-time monitored；Institute
When the output switch for stating electric power coversion system disconnects, the electric current of the current sensor monitoring is the electric capacity electricity of the wave filter
Stream；
Determining unit, for the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system, it is determined that
Whether the capacitor's capacity of the wave filter is normal.
7. the detection means of the capacitor's capacity of electric power coversion system median filter as claimed in claim 6, it is characterised in that institute
Acquiring unit is stated, is additionally operable to obtain the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored；Institute
When the output switch for stating electric power coversion system disconnects, the voltage of the voltage sensor senses is the electric capacity electricity of the wave filter
Pressure；
The determining unit, specifically for the voltage transient real-time monitored based on the voltage sensor of the electric power coversion system
The current instantaneous value that the current sensor of value and the electric power coversion system is real-time monitored, the electric capacity for determining the wave filter holds
Value；When the capacitor's capacity of the wave filter is located in the range of default capacitance, determine that the capacitor's capacity of the wave filter is normal.
8. the detection means of the capacitor's capacity of electric power coversion system median filter as claimed in claim 6, it is characterised in that institute
Determining unit is stated, the current instantaneous value that the current sensor specifically for being based on the electric power coversion system is real-time monitored, really
The capacitance current virtual value of the fixed wave filter；When the capacitance current virtual value of the wave filter is located in the range of predetermined current
When, determine that the capacitor's capacity of the wave filter is normal；The predeterminated voltage that the predetermined current scope is exported according to the changer
And the normal capacitor's capacity setting of the wave filter.
9. the detection means of the capacitor's capacity of electric power coversion system median filter as claimed in claim 7, it is characterised in that institute
Determining unit is stated, the instantaneous voltage that the voltage sensor specifically for being based on the electric power coversion system is real-time monitored, really
The capacitance voltage frequency of the fixed wave filter and the capacitance voltage virtual value of the wave filter；And based on the electrical power conversion system
The current instantaneous value that the current sensor of system is real-time monitored, determines the capacitance current virtual value of the wave filter；Based on a determination that
The capacitance current of the capacitance voltage frequency of the wave filter, the capacitance voltage virtual value of the wave filter and the wave filter have
Valid value, determines the capacitor's capacity of the wave filter；Or
Based on the instantaneous voltage that the voltage sensor of the electric power coversion system is real-time monitored, the electricity of the wave filter is determined
Hold voltage effective value；And the current instantaneous value real-time monitored based on the current sensor of the electric power coversion system, it is determined that
The capacitance current frequency of the wave filter and the capacitance current virtual value of the wave filter；Based on a determination that the wave filter electricity
The capacitance current virtual value of capacitance current frequency, the capacitance voltage virtual value of the wave filter and the wave filter, determines the filter
The capacitor's capacity of ripple device.
10. the detection means of the capacitor's capacity of the electric power coversion system median filter as described in claim 6-9 is arbitrary, its feature
It is, described control unit, specifically for the voltage wink real-time monitored based on the voltage sensor of the electric power coversion system
Duration, determines the current phase place of capacitance voltage of the wave filter；Control the electric power coversion system changer output phase and
The current phase place identical predeterminated voltage of capacitance voltage of the wave filter；Or
The changer output frequency that controls the electric power coversion system is identical with predeterminated voltage frequency, amplitude is less than the default electricity
The given voltage of pressure amplitude value, and control the amplitude that the amplitude of the given voltage gradually increases to the predeterminated voltage.
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| CN106058930A (en) * | 2016-07-06 | 2016-10-26 | 许继集团有限公司 | Automatic detecting system and automatic detecting method for capacitance of photovoltaic grid-connected inverter bus capacitor |
| CN108964080A (en) * | 2018-08-15 | 2018-12-07 | 武汉世纪精能科技发展有限公司 | TSC operation/cutting method, terminal device and computer readable storage medium |
| CN111308311A (en) * | 2018-12-12 | 2020-06-19 | 北京金风科创风电设备有限公司 | Fault diagnosis method and device for filter circuit of converter and storage medium |
| CN113447720B (en) * | 2020-03-27 | 2022-05-13 | 比亚迪股份有限公司 | Finished automobile Y-capacitor detection system and method and new energy vehicle |
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