CN109596923A - Frequency converter bus capacitor on-line measuring device, method and frequency converter - Google Patents
Frequency converter bus capacitor on-line measuring device, method and frequency converter Download PDFInfo
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- CN109596923A CN109596923A CN201811579682.0A CN201811579682A CN109596923A CN 109596923 A CN109596923 A CN 109596923A CN 201811579682 A CN201811579682 A CN 201811579682A CN 109596923 A CN109596923 A CN 109596923A
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- bus capacitor
- frequency converter
- power supply
- capacitor
- igbt
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
This application involves a kind of frequency converter bus capacitor on-line measuring device, method and frequency converters.Wherein, frequency converter bus capacitor on-line measuring device includes DC power supply circuit, detects capacitor, detection resistance, peak detection circuit and the controller for connecting frequency converter.DC power supply circuit can charge for the bus capacitor of frequency converter；Bus capacitor both ends are connected in parallel on after detection capacitor and detection resistance concatenation；Peak detection circuit is separately connected detection capacitor and detection resistance, obtains the peak signal of the voltage transient variable quantity of bus capacitor, and peak signal is transferred to controller.Controller obtains the internal resistance of bus capacitor based on peak signal.Changed by the internal resistance of bus capacitor, can more accurately judge the aging conditions of bus capacitor；Based on this, the internal resistance of the bus capacitor of the diagnosable milliohm rank of frequency converter, so that burn-in test is more accurate.Meanwhile the diagnosis process of on-line checking internal resistance can carry out automatically, be not necessarily to manual intervention, improve the efficiency of test.
Description
Technical field
This application involves converter technology fields, more particularly to a kind of frequency converter bus capacitor on-line measuring device, side
Method and frequency converter.
Background technique
The bus capacitor of frequency converter can show as capacitance decline, the leakage current of capacitor increases with time gradually aging
Big and capacitor internal resistance increases.The ultimate failure of bus capacitor will lead to frequency converter and shut down or even damage other devices, therefore
It can determine whether out the aging conditions of capacitor by the capacitance or leakage current of diagnosis bus capacitor or its internal resistance, to avoid capacitor
Damage.
During realization, inventor has found that at least there are the following problems in traditional technology: utilizing bridge measurement capacitor
Internal resistance judges that the aging conditions of capacitor need to dismantle bus capacitor, and needs testing staff's execute-in-place, time-consuming and laborious.
Summary of the invention
Based on this, it is necessary to need execute-in-place for traditional technology detection frequency converter bus capacitor, time-consuming and laborious asks
Topic provides a kind of frequency converter bus capacitor on-line measuring device, method and frequency converter.
To achieve the goals above, on the one hand, the embodiment of the present application provides a kind of frequency converter bus capacitor on-line checking
Device, comprising: DC power supply circuit detects capacitor, detection resistance, peak detection circuit and the control for connecting frequency converter
Device.
The first electrode of DC power supply circuit is separately connected the first end of the bus capacitor of frequency converter, detects the first of capacitor
End；The second electrode of DC power supply circuit is separately connected the second end of bus capacitor, the first end of detection resistance；Detect capacitor
Second end is separately connected the second end of detection resistance, the first end of peak detection circuit；The second end of peak detection circuit connects
The third end of the first end of detection resistance, peak detection circuit connects controller.Controller is separately connected DC power supply circuit
Control terminal, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) mould group of frequency converter
And the three-phase power switch of frequency converter.
Peak detection circuit is based on detection capacitor and detection resistance, obtains the peak value of the voltage transient variable quantity of bus capacitor
Signal, and peak signal is transferred to controller；Controller obtains the internal resistance of bus capacitor based on peak signal.
DC power supply circuit includes DC power supply and charge switch in one of the embodiments,.The of DC power supply
One electrode is separately connected the first end of bus capacitor by charge switch, detects the first end of capacitor, the second electricity of DC power supply
Pole is separately connected the second end of bus capacitor, the first end of detection resistance.Controller is also used to control charge switch, IGBT respectively
The on-off of mould group and three-phase power switch.
DC power supply circuit further includes charging resistor in one of the embodiments,.
The first electrode of DC power supply connects charge switch by charging resistor.
Alternatively, the second electrode of DC power supply is separately connected the second end of bus capacitor, detection resistance by charging resistor
First end.
It in one of the embodiments, further include isolation circuit；The third end of peak detection circuit is connected by isolation circuit
Connect controller.
On the other hand, the embodiment of the present application also provides a kind of based on above-mentioned frequency converter bus capacitor on-line measuring device
Method, comprising:
It controls IGBT mould group and three-phase power switch disconnects.
When the voltage of bus capacitor is lower than predeterminated voltage, control DC power supply circuit charges to bus capacitor, and in mother
When the voltage of line capacitance reaches predeterminated voltage, stop the charging of DC power supply circuit.
The bridge arm conducting for controlling any phase in IGBT mould group, so that bus capacitor is discharged by IGBT mould group.
Based on peak detection circuit when bridge arm is connected, the peak signal that gets, the internal resistance of bus capacitor is obtained.
It is obtained when bridge arm is connected, the peak signal that gets based on peak detection circuit in one of the embodiments,
The step of internal resistance of bus capacitor includes:
According to peak signal, the conducting saturation voltage drop of IGBT mould group is obtained.
Processing conducting saturation voltage drop, obtains transient current.
According to peak signal and transient current, internal resistance is obtained.
In one of the embodiments, according to peak signal, the step of obtaining the conducting saturation voltage drop of IGBT mould group packet
It includes:
Predeterminated voltage and peak signal are asked poor, obtain conducting saturation voltage drop.
Processing conducting saturation voltage drop, the step of obtaining transient current, include: in one of the embodiments,
Based on conducting saturation voltage drop, inquiry obtains transient current in predeterminated voltage current relationship table.
Alternatively, being fitted in default IGBT voltage-current curve based on conducting saturation voltage drop, obtaining transient current.
Alternatively, obtaining transient current based on conducting saturation voltage drop and relational expression；Wherein, relational expression is that fitting is default
IGBT voltage-current curve obtains.
In one of the embodiments, according to peak signal and transient current, the step of obtaining internal resistance, includes:
Ratio based on peak signal and transient current, obtains internal resistance.
A kind of frequency converter, including three-phase power switch be also provided in one of the embodiments, rectifier, bus capacitor,
IGBT mould group and such as above-mentioned frequency converter bus capacitor on-line measuring device.
The input terminal of three-phase power switch connects rectifier for connecting three phase mains, the output end of three-phase power switch
Input terminal；The first electrode of rectifier is separately connected the first end of the first end of bus capacitor, IGBT mould group, and the second of rectifier
Electrode is separately connected the second end of the second end of bus capacitor, IGBT mould group.
A technical solution in above-mentioned technical proposal is had the following advantages and beneficial effects:
Frequency converter bus capacitor on-line measuring device, including DC power supply circuit detect capacitor, detection resistance, peak value inspection
Slowdown monitoring circuit and controller for connecting frequency converter.DC power supply circuit can charge for the bus capacitor of frequency converter；Detection electricity
Hold and is connected in parallel on bus capacitor both ends with after detection resistance concatenation；Peak detection circuit is separately connected detection capacitor and detection resistance,
The peak signal of the voltage transient variable quantity of bus capacitor is obtained, and peak signal is transferred to controller.Controller is based on peak
Value signal obtains the internal resistance of bus capacitor.Changed by the internal resistance of bus capacitor, can more accurately judge the aging of bus capacitor
Situation；Based on this, the internal resistance of the bus capacitor of the diagnosable milliohm rank of frequency converter, so that burn-in test is more accurate.Meanwhile
The diagnosis process of line detection internal resistance can carry out automatically, be not necessarily to manual intervention, improve the efficiency of test.
Detailed description of the invention
By being more particularly described for preferred embodiment of the present application shown in the drawings, the above and other mesh of the application
, feature and advantage will become more fully apparent.Identical appended drawing reference indicates identical part in all the attached drawings, and does not carve
Meaning draws attached drawing by actual size equal proportion scaling, it is preferred that emphasis is shows the purport of the application.
Fig. 1 is the first schematic diagram of frequency converter bus capacitor on-line measuring device in one embodiment；
Fig. 2 is the second schematic diagram of frequency converter bus capacitor on-line measuring device in one embodiment；
Fig. 3 is the third schematic diagram of frequency converter bus capacitor on-line measuring device in one embodiment；
Fig. 4 is the first schematic flow chart of frequency converter bus capacitor online test method in one embodiment；
Fig. 5 is the second schematic flow chart of frequency converter bus capacitor online test method in one embodiment；
Fig. 6 is the third schematic flow chart of frequency converter bus capacitor online test method in one embodiment；
Fig. 7 is the first schematic diagram of frequency converter in one embodiment；
Fig. 8 is the second schematic diagram of frequency converter in one embodiment；
Fig. 9 is the flow diagram of the online test method of frequency converter bus capacitor internal resistance in one embodiment.
Specific embodiment
The application in order to facilitate understanding is described more fully the application below with reference to relevant drawings.In attached drawing
Give the preferred embodiment of the application.But the application can realize in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to disclosure of this application.
It should be noted that it can be directly to separately when an element is considered as " connection " another element
One element and it is in combination be integrated, or may be simultaneously present centering elements.Term as used herein " control ", " the
One end ", " second end " and similar statement are for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more phases
Any and all combinations of the listed item of pass.
Frequency converter mainly by rectify (AC to DC), filtering, inversion (direct current become exchange), brake unit, driving unit,
The composition such as detection unit and microprocessing unit.Frequency converter close to the inner portion cut-off to adjust the voltage of out-put supply and frequency by IGBT mould group
Rate, supply voltage required for providing it according to the actual needs of motor, and then achieve the purpose that energy conservation, speed regulation.Frequency converter
It may include three-phase power switch, bus capacitor and IGBT mould group.Wherein, three-phase power switch can be used for controlling three-phase input electricity
Source is switched on or switched off.Bus capacitor can be used for filtering, specifically, can be by the flat wave of the output voltage of rectification circuit, by exchange point
Amount is reduced to minimum.IGBT mould group can be used for being converted in direct current the alternating current of driving motor.
Traditional technology obtains capacitance by the charge and discharge time of bus capacitor, and then judges the bus electricity of frequency converter
The aging conditions of appearance.And in the use process of frequency converter, with the aging of bus capacitor, the internal resistance change rate of capacitor is much larger than
The change rate of capacitance, therefore, traditional technology require manual intervention the burn-in test of bus capacitor and inaccurate, deposit
In the difficult problem of bus capacitor diagnosis.
For this purpose, in one embodiment, a kind of frequency converter bus capacitor on-line measuring device is provided, as shown in Figure 1, Fig. 1
For the first schematic diagram of frequency converter bus capacitor on-line measuring device in one embodiment, comprising: DC power supply circuit,
Detect capacitor, detection resistance, peak detection circuit and the controller for connecting frequency converter.
The first electrode of DC power supply circuit is separately connected the first end of the bus capacitor of frequency converter, detects the first of capacitor
End；The second electrode of DC power supply circuit is separately connected the second end of bus capacitor, the first end of detection resistance；Detect capacitor
Second end is separately connected the second end of detection resistance, the first end of peak detection circuit；The second end of peak detection circuit connects
The third end of the first end of detection resistance, peak detection circuit connects controller.Controller is separately connected DC power supply circuit
Control terminal, the IGBT mould group of frequency converter and the three-phase power switch of frequency converter.
Peak detection circuit is based on detection capacitor and detection resistance, obtains the peak value of the voltage transient variable quantity of bus capacitor
Signal, and peak signal is transferred to controller；Controller obtains the internal resistance of bus capacitor based on peak signal.
Specifically, DC power supply circuit is connected in parallel on bus capacitor both ends, can be used for mentioning in bus capacitor internal resistance detection
For the DC voltage of standard.Detect the first end of the first end connection bus capacitor of capacitor, the of second end connecting detection resistance
Two ends；The second end of the first end connection bus capacitor of detection resistance；That is, detection capacitor is in parallel and female after concatenating with detection resistance
The both ends of line capacitance.
The first end of peak detection circuit is separately connected second end, the second end of detection resistance of detection capacitor, second end
The first end of connecting detection resistance, third end connect controller.That is, the first end and second end of peak detection circuit and detection electricity
Resistance is in parallel.Controller is separately connected the control terminal of DC power supply circuit, IGBT mould group and three-phase power switch.
It detects capacitor and detection resistance extracts the voltage transient variable quantity of bus capacitor, peak detection circuit is based on voltage wink
State variable quantity obtains peak signal, and peak signal is transferred to controller.The peak that controller is transmitted based on peak detection circuit
The internal resistance of bus capacitor can be obtained in value signal.
It should be noted that IGBT mould group can be when detecting bus capacitor internal resistance as transient load.Specifically, IGBT mould
Group includes U phase bridge arm, V phase bridge arm and W phase bridge arm.Wherein, U phase bridge arm may include bridge arm and U phase lower bridge arm in U phase；V phase bridge
Arm may include bridge arm and V phase lower bridge arm in V phase；W phase bridge arm may include bridge arm and W phase lower bridge arm in W phase.Specifically show at one
In example, U phase bridge arm includes two IGBT, and V phase bridge arm includes two IGBT, and W phase bridge arm includes two IGBT.
DC power supply circuit can be used for charging for bus capacitor, so that bus capacitor reaches predeterminated voltage, meet internal resistance
On-line testing.Specifically, DC power supply circuit can be powered by DC power supply, power supply etc. is converted in battery power supply or three-phase electricity, herein
With no restrictions；Optionally, DC power supply circuit can provide the voltages such as 3V (volt), 5V or 10V for bus capacitor, not limit herein
System.
Detection capacitor and detection resistance can be used for extracting the voltage transient variable quantity of bus capacitor, simultaneously, it may also be used for every
From busbar voltage.Specifically, busbar voltage when operating normally can be isolated for preposition detection capacitor and detection resistance, and
The voltage transient variable quantity of bus capacitor is extracted when bus capacitor internal resistance detection.Optionally, detection resistance can be preset resistive value
Load, detection capacitor can be the charge and discharge electrical part of default capacitance.
Peak detection circuit can be used for extracting the peak value of input signal, for example, the electricity for extracting bus capacitor
Press the peak signal of transient changing amount.Specifically, peak detection circuit can mainly by capacitor, diode, operational amplifier with
And reset switch composition, there are many specific embodiments, herein with no restrictions.
What controller can be used for controlling DC power supply circuit, IGBT mould group and three-phase power switch respectively connects on-off
It opens；Simultaneously, it may also be used for according to the peak signal of the bus capacitor of feedback, obtain the internal resistance value of bus capacitor.Specifically, it controls
Device can be by single-chip microcontroller, DSP (Digital Signal Processing, Digital Signal Processing) or FPGA (Field-
Programmable Gate Array, field programmable gate array) etc. devices realize, herein with no restrictions.
In the embodiment of the present application, controller can control frequency converter to stop exporting and cut off three-phase input power supply；DC power supply
Circuit can be charged based on the bus capacitor that the instruction of controller is frequency converter；Mother is connected in parallel on after detection capacitor and detection resistance concatenation
Line capacitance both ends；Peak detection circuit is separately connected detection capacitor and detection resistance, obtains the voltage transient variation of bus capacitor
The peak signal of amount, and peak signal is transferred to controller；Controller obtains the internal resistance of bus capacitor based on peak signal.It is logical
The internal resistance variation for crossing bus capacitor, can more accurately judge the aging conditions of bus capacitor；Based on this, the diagnosable milliohm of frequency converter
The internal resistance of the bus capacitor of rank, so that burn-in test is more accurate.Meanwhile the diagnosis process of on-line checking internal resistance can automatically into
Row is not necessarily to manual intervention, without disassembly bus capacitor, improves the efficiency of test.In addition, the settable frequency conversion of the embodiment of the present application
In device,
In one embodiment, as shown in Fig. 2, Fig. 2 is frequency converter bus capacitor on-line measuring device in one embodiment
The second schematic diagram, DC power supply circuit includes DC power supply and charge switch.The first electrode of DC power supply is logical
It overcharges electric switch to be separately connected the first end of bus capacitor, detect the first end of capacitor, the second electrode of DC power supply connects respectively
Connect the second end of bus capacitor, the first end of detection resistance.Controller be also used to control respectively charge switch, IGBT mould group and
The on-off of three-phase power switch.
Specifically, DC power supply circuit may include DC power supply and charge switch.DC power supply is connected by charge switch
Connect bus capacitor.DC power supply can be used for being provided as bus capacitor charging and provide predeterminated voltage；Charge switch can be used for connect or
Disconnect DC power supply, the charging or stopping charging of control bus capacitor.
It should be noted that controller can control the conducting of charge switch, IGBT mould group and three-phase power switch respectively
Or it disconnects；Specifically, controller can be bus capacitor charging based on charge switch control DC power supply, can control in IGBT mould group
Any phase bridge arm conducting, can also be based on three-phase power switch control three-phase input plant-grid connection or disconnection.Optionally, it controls
Device can control the on-off of charge switch by modes such as relay, contactor or switching tubes, be not specifically limited herein.
The embodiment of the present application uses DC power supply, convenient for providing predeterminated voltage for bus capacitor；Can according to actual needs, if
Set the voltage supply of predeterminated voltage and DC power supply circuit.Controller can obtain predeterminated voltage and/or DC power supply circuit mentions
The charging voltage of confession.
In one embodiment, as shown in Fig. 2, DC power supply circuit further includes charging resistor.
The first electrode of DC power supply connects charge switch by charging resistor.
Alternatively, the second electrode of DC power supply is separately connected the second end of bus capacitor, detection resistance by charging resistor
First end.
Specifically, DC power supply circuit further includes charging resistor；DC power supply connects bus capacitor by charging resistor.
It should be noted that charging resistor can be used for limiting charging current when DC power supply is connected, current overload is avoided
Damage to frequency converter or online testing device improves safety.
In one embodiment, as shown in figure 3, Fig. 3 is frequency converter bus capacitor on-line measuring device in one embodiment
Third schematic diagram, further include isolation circuit；The third end of peak detection circuit connects controller by isolation circuit.
Specifically, frequency converter bus capacitor on-line measuring device may also include isolation circuit；Isolation circuit is connected to peak
It is worth between detection circuit and controller.
It should be noted that isolation circuit can be used for being converted to peak signal the letter with controller with same reference ground
Number, high pressure and low pressure can be isolated, improve the safety of detection device.Specifically, isolation circuit can be based on linear light
Coupling realizes the isolation and signal conversion of high-low pressure.It should be noted that there are many specific embodiments of isolation circuit,
This is with no restrictions.
In one embodiment, a kind of method based on above-mentioned frequency converter bus capacitor on-line measuring device is provided, such as
Shown in Fig. 4, Fig. 4 is the first schematic flow chart of frequency converter bus capacitor online test method in one embodiment, comprising:
Step S110, controls IGBT mould group and three-phase power switch disconnects.
Specifically, three-phase bridge arm disconnects in controller control IGBT mould group, stop the output of frequency converter, and disconnect three
Phase power switch cuts off three-phase input power supply.Specifically, controller can control the IGBT of U, V, W three-phase to remain off.
Step S120, when the voltage of bus capacitor is lower than predeterminated voltage, control DC power supply circuit is filled to bus capacitor
Electricity, and when the voltage of bus capacitor reaches predeterminated voltage, stop the charging of DC power supply circuit.
Specifically, controller connects DC power supply circuit when the voltage of bus capacitor is lower than predeterminated voltage, bus is given
Capacitor charging, so that the voltage of bus capacitor reaches predeterminated voltage.Controller is disconnected when bus capacitor charges to predeterminated voltage
DC power supply circuit is to stop charging.
It should be noted that predeterminated voltage can be configured according to actual needs, such as 5V, 3V, 10V etc. are not done herein
Limitation；Meanwhile predeterminated voltage can also be the voltage that DC power supply circuit provides.The predeterminated voltage can be inputted in controller in advance,
Or the predeterminated voltage is obtained by DC power supply circuit.
Step S130 controls the bridge arm conducting of any phase in IGBT mould group, so that bus capacitor is discharged by IGBT mould group.
Specifically, controller connects IGBT after bus capacitor charges to predeterminated voltage and disconnects DC power supply circuit
The bridge arm conducting of any phase in mould group；Bus capacitor can be discharged by the bridge arm be connected in IGBT mould group.Specifically, controller can
It is switched on or switched off the upper and lower bridge arm of U phase, the upper and lower bridge arm of V phase can also be switched on or switched off, or is on or off the upper and lower bridge of W phase
Arm.
Step S140 obtains bus capacitor based on peak detection circuit when bridge arm is connected, the peak signal that gets
Internal resistance.
Specifically, peak detection circuit obtains the voltage transient variable quantity of bus capacitor when IGBT bridge arm is connected
Peak signal, and it is transferred to controller.Controller is based on peak signal and is handled, and the internal resistance of bus capacitor can be obtained.
In the embodiment of the present application, controller can control the on-off of the output of frequency converter, frequency converter and three-phase input power supply with
And in IGBT mould group any phase on-off, also controllable DC power supply circuit gives bus capacitor charging, passes through peak detection circuit
Acquire the peak signal of the voltage transient variable quantity of bus capacitor.Based on this, controller can on-line checking frequency converter bus electricity
The internal resistance of appearance, the accurate degree of aging for testing bus capacitor, and burn-in test process can avoid mother by controller automatic running
The disassembly of line capacitance improves the efficiency and reliability of test.
In one embodiment, as shown in figure 5, Fig. 5 is frequency converter bus capacitor online test method in one embodiment
The second schematic flow chart obtain bus capacitor based on peak detection circuit when bridge arm is connected, the peak signal that gets
Internal resistance the step of include:
Step S142 obtains the conducting saturation voltage drop of IGBT mould group according to peak signal.
Step S144, processing conducting saturation voltage drop, obtains transient current.
Step S148 obtains internal resistance according to peak signal and transient current.
Specifically, controller can according to bus capacitor IGBT be connected when voltage transient variable quantity peak signal,
Processing obtains the conducting saturation voltage drop of IGBT mould group at this time.Further, the conducting that controller handles IGBT at this time is saturated electricity
The transient current of IGBT turn-on instant can be obtained in pressure drop.Controller according to bus capacitor peak signal and IGBT be connected
When transient current, can handle to obtain the internal resistance of bus capacitor.
The embodiment of the present application is based on peak signal, conducting saturation voltage drop and transient current, can quickly obtain bus capacitor
Internal resistance.
In one embodiment, as shown in fig. 6, Fig. 6 is frequency converter bus capacitor online test method in one embodiment
Third schematic flow chart, according to peak signal, the step of obtaining the conducting saturation voltage drop of IGBT mould group, includes:
Predeterminated voltage and peak signal are asked poor by step S143, obtain conducting saturation voltage drop.
Specifically, the peak of the bus capacitor when conducting saturation voltage drop of IGBT mould group is connected by predeterminated voltage with IGBT
Value signal asks difference to obtain.
It should be noted that controller can ask poor to predeterminated voltage and peak signal, and the result of difference will be asked to be confirmed as leading
Logical saturation voltage drop can also be used optimized coefficients and optimize to the result for seeking difference, and the result after optimization is confirmed as being connected
Saturation voltage drop.
In one embodiment, processing conducting saturation voltage drop, the step of obtaining transient current, include:
Based on conducting saturation voltage drop, it is fitted in default IGBT voltage-current curve, obtains transient current.Alternatively, base
In conducting saturation voltage drop and relational expression, transient current is obtained；Wherein, relational expression is to be fitted default IGBT voltage-current curve
It obtains.
Specifically, controller can be in default IGBT voltage-current curve for the transient current of IGBT turn-on instant
Fitting obtains the corresponding transient current of conducting saturation voltage drop；Meanwhile it can be used at conducting saturation voltage drop and relational expression
Reason obtains.Wherein, relational expression can preset the relational expression that IGBT voltage-current curve is fitted for basis；Specifically, in advance
If IGBT voltage-current curve can be the conducting voltage of IGBT databook and the relation curve of conducting electric current；Relational expression can basis
The conducting voltage of IGBT databook and the relation curve of conducting electric current are fitted to obtain.
It should be noted that controller can store relational expression, and conducting saturation voltage drop is handled based on relational expression,
Obtain transient current.Wherein, relational expression may also include Optimal Parameters, can be used for improving the precision of transient current.
In one embodiment, as shown in fig. 6, the step of handling conducting saturation voltage drop, obtaining transient current includes:
Step S145, based on conducting saturation voltage drop, inquiry obtains institute's transient current in predeterminated voltage current relationship table.
Specifically, being directed to the transient current of IGBT turn-on instant, controller can also be by predeterminated voltage current relationship
The corresponding electric current of table inquiry conducting saturation voltage drop, and the electric current is confirmed as transient current；Meanwhile controller can also be to the electricity
Stream optimizes, and the result after optimization is confirmed as transient current.
It should be noted that predeterminated voltage current relationship table can be the conducting voltage and conducting electric current relationship pre-established
Table.Specifically, the precision of the conducting voltage of conducting voltage and conducting electric current relation table can be 0.01V, 0.02V or 0.05V, herein
With no restrictions.The predeterminated voltage current relationship table of corresponding precision can according to actual needs, be arranged in controller, to improve processing effect
Rate.
In one embodiment, as shown in fig. 6, according to peak signal and transient current, the step of obtaining internal resistance, includes:
Step S149, the ratio based on peak signal and transient current, obtains internal resistance.
Specifically, the ratio of peak signal and transient current can be confirmed as internal resistance by controller, optimization system can also be used
Number reduced value optimizes, and using the result of optimization as internal resistance.Specifically, the internal resistance of bus capacitor can be equal to bus capacitor
The transient current when peak signal of voltage transient variable quantity is connected divided by IGBT.
In the embodiment of the present application, the internal resistance of the frequency converter bus capacitor of the diagnosable milliohm rank of controller passes through bus electricity
The internal resistance variation of appearance judges that the aging conditions of bus capacitor are more accurate；Meanwhile diagnosis process carries out automatically, is not necessarily to manual intervention,
Improve testing efficiency.
It should be understood that although each step in the flow chart of Fig. 4 to 6 is successively shown according to the instruction of arrow,
It is these steps is not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
There is no stringent sequences to limit for rapid execution, these steps can execute in other order.Moreover, in Fig. 4 to 6 at least
A part of step may include that perhaps these sub-steps of multiple stages or stage are not necessarily in same a period of time to multiple sub-steps
Quarter executes completion, but can execute at different times, the execution in these sub-steps or stage be sequentially also not necessarily according to
Secondary progress, but in turn or can replace at least part of the sub-step or stage of other steps or other steps
Ground executes.
In one embodiment, a kind of frequency converter is provided, as shown in fig. 7, Fig. 7 is first of frequency converter in one embodiment
Schematic diagram, including three-phase power switch, rectifier, bus capacitor, IGBT mould group and such as above-mentioned frequency converter bus
Capacitor on-line measuring device.
The input terminal of three-phase power switch connects rectifier for connecting three phase mains, the output end of three-phase power switch
Input terminal；The first electrode of rectifier is separately connected the first end of the first end of bus capacitor, IGBT mould group, and the second of rectifier
Electrode is separately connected the second end of the second end of bus capacitor, IGBT mould group.
Specifically, frequency converter includes being sequentially connected three-phase power switch, rectifier, bus capacitor and IGBT mould group；Its
In, three-phase power switch is for accessing three-phase input power supply, and IGBT mould group is for connecting motor.That is, rectifier can be by input
Three-phase electricity is rectified and is applied to IGBT mould group, at the same bus capacitor respectively with rectifier, IGBT modules in parallel.In addition, becoming
Frequency device is additionally provided with frequency converter bus capacitor on-line measuring device, the on-line measuring device can control respectively three-phase power switch,
The on-off of IGBT mould group, the internal resistance of on-line checking bus capacitor more accurately carry out burn-in test to bus capacitor.
It should be noted that the controller of on-line measuring device can be separately connected the gate pole of each IGBT in IGBT mould group, use
In cut-offfing for control IGBT mould group, it is capable of the internal resistance of on-line testing bus capacitor, additionally it is possible to adjust the voltage and frequency of out-put supply
Rate so that frequency converter provide it according to the actual needs of motor required for supply voltage.That is, frequency converter bus capacitor is online
Detection device may be provided in frequency converter, for control IGBT mould group realize frequency conversion, meanwhile, can on-line checking bus capacitor it is old
Change degree.Wherein, the IGBT topology in IGBT mould group can there are many modes, herein with no restrictions.
In one embodiment, as shown in figure 8, Fig. 8 is the second schematic diagram of frequency converter in one embodiment, become
The on-line measuring device of frequency device bus capacitor internal resistance includes: switch K1, IGBT mould group, DC low voltage power supply, charging resistor Rs, opens
Close K2, preposition detection capacitor Cf and detection resistance Rf, peak detection circuit, isolation circuit and master controller.
Wherein, switch K1 is three-phase power switch, and for turning on/off three-phase input power supply, specifically, switch K1 can make
With contactor, master controller controls the on/off of three-phase input power supply by contactor.IGBT mould group is converted to direct current
The alternating current of driving motor, and when detecting the internal resistance of bus capacitor as transient load.DC low voltage power supply is female in detection
The DC voltage of standard is provided when the internal resistance of line capacitance.Charging resistor Rs is used to limit charging electricity when DC low voltage power supply is connected
Stream.Switch K2 is charge switch, for turning on/off DC low voltage power supply.
Preposition detection capacitor Cf and detection resistance Rf is isolated by busbar voltage when operating normally, and in detection bus electricity
The voltage transient variable quantity of bus capacitor is extracted when the internal resistance of appearance.Peak detection circuit extracts preposition detection capacitor Cf and detection electricity
Hinder the peak signal of Rf output voltage transient changing amount.Isolation circuit is converted to the peak signal of voltage transient variable quantity and master
Signal of the controller with same reference ground.
The ON/OFF of main controller controls switch K1, K2 and IGBT, and the wink of the bus capacitor voltage according to feedback
The internal resistance value of state variable quantity signal calculating bus capacitor.
In one embodiment, it is based on above-mentioned frequency converter, a kind of on-line checking side of frequency converter bus capacitor internal resistance is provided
Method, as shown in figure 9, Fig. 9 is the flow diagram of the online test method of frequency converter bus capacitor internal resistance in one embodiment, packet
Include following steps:
A) IGBT of U, V, W three-phase is remained off, and disconnects switch K1, cuts off three-phase input power supply.
B) switch K2 is connected when frequency converter bus capacitor voltage is lower than DC low voltage power supply voltage, makes bus capacitor voltage
Reach DC low voltage power supply voltage.
C) after disconnecting switch K2, IGBT the or W phase for connecting the upper and lower bridge arm of IGBT or V phase of the upper and lower bridge arm of U phase is upper and lower
The IGBT of bridge arm makes bus capacitor discharge by IGBT.
D) the voltage transient variable quantity signal of bus capacitor when master controller is connected according to IGBT calculates IGBT's at this time
Saturation voltage drop is connected.Wherein, the conducting saturation voltage drop of IGBT can be equal to DC low voltage power supply voltage subtract IGBT conducting when
Bus capacitor voltage transient changing amount.
E) master controller calculates the transient current of IGBT turn-on instant according to the conducting saturation voltage drop of IGBT at this time.
Specifically, the transient current of IGBT turn-on instant can be according to the conducting voltage of IGBT and the relation curve of conducting electric current
It calculates.
Alternatively, the transient current of IGBT turn-on instant can be according to the conducting voltage of IGBT and the relational expression meter of conducting electric current
It calculates；Wherein, the relational expression of the conducting voltage and conducting electric current of IGBT is the conducting voltage and electric conduction according to IGBT databook
The relation curve of stream is fitted to obtain.
Alternatively, the transient current of IGBT turn-on instant can also be by inquiring the conducting voltage and conducting electric current that pre-establish
The mode of relation table obtains；Wherein, conducting voltage and conducting electric current relation table are established with conducting voltage for the precision of 0.02V.
F) master controller is according to the transient changing amount of the bus capacitor voltage and the IGBT turn-on instant
Transient current calculates the internal resistance of bus capacitor, relationship are as follows: the internal resistance of bus capacitor is equal to the transient changing of bus capacitor voltage
Measure the transient current divided by IGBT turn-on instant.
In the embodiment of the present application, the internal resistance of the bus capacitor of the diagnosable milliohm rank of frequency converter, by bus capacitor
Resistiveization judges that the aging conditions of bus capacitor are more accurate；Meanwhile diagnosis process carries out automatically, is not necessarily to manual intervention, improves and surveys
Try efficiency.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor
It controls IGBT mould group and three-phase power switch disconnects.
When the voltage of bus capacitor is lower than predeterminated voltage, control DC power supply circuit charges to bus capacitor, and in mother
When the voltage of line capacitance reaches predeterminated voltage, stop the charging of DC power supply circuit.
The bridge arm conducting for controlling any phase in IGBT mould group, so that bus capacitor is discharged by IGBT mould group.
Based on peak detection circuit when bridge arm is connected, the peak signal that gets, the internal resistance of bus capacitor is obtained.
In one embodiment, computer program be executed by processor based on peak detection circuit bridge arm conducting when, obtain
The peak signal got also performs the steps of when obtaining the internal resistance of bus capacitor
According to peak signal, the conducting saturation voltage drop of IGBT mould group is obtained.
Processing conducting saturation voltage drop, obtains transient current.
According to peak signal and transient current, internal resistance is obtained.
In one embodiment, computer program is executed by processor the conducting that IGBT mould group is obtained according to peak signal
When saturation voltage drop, also perform the steps of
Predeterminated voltage and peak signal are asked poor, obtain conducting saturation voltage drop.
In one embodiment, computer program is executed by processor processing conducting saturation voltage drop, obtains transient current
When, also perform the steps of
Based on conducting saturation voltage drop, inquiry obtains transient current in predeterminated voltage current relationship table.
Alternatively, being fitted in default IGBT voltage-current curve based on conducting saturation voltage drop, obtaining transient current.
Alternatively, obtaining transient current based on conducting saturation voltage drop and relational expression；Wherein, relational expression is that fitting is default
IGBT voltage-current curve obtains.
In one embodiment, computer program is executed by processor according to peak signal and transient current, obtains internal resistance
When, also perform the steps of
Ratio based on peak signal and transient current, obtains internal resistance.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to the application range therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art,
Without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection model of the application
It encloses.Therefore, the scope of protection shall be subject to the appended claims by the application.
Claims (10)
1. a kind of frequency converter bus capacitor on-line measuring device characterized by comprising DC power supply circuit detects capacitor, inspection
Measuring resistance, peak detection circuit and the controller for connecting frequency converter；
The first electrode of the DC power supply circuit is separately connected the first end of the bus capacitor of the frequency converter, detection electricity
The first end of appearance；The second electrode of the DC power supply circuit is separately connected the second end of the bus capacitor, detection electricity
The first end of resistance；The second end of the detection capacitor is separately connected the second end of the detection resistance, the peak detection circuit
First end；The second end of the peak detection circuit connects the first end of the detection resistance, the peak detection circuit
Third end connects the controller；
The controller is separately connected the control terminal of the DC power supply circuit, the IGBT mould group and the change of the frequency converter
The three-phase power switch of frequency device；
The peak detection circuit is based on the detection capacitor and the detection resistance, obtains the voltage transient of the bus capacitor
The peak signal of variable quantity, and the peak signal is transferred to the controller；The controller is based on the peak signal
Obtain the internal resistance of the bus capacitor.
2. frequency converter bus capacitor on-line measuring device according to claim 1, which is characterized in that the DC power supply electricity
Road includes DC power supply and charge switch；
The first electrode of the DC power supply is separately connected the first end of the bus capacitor, the inspection by the charge switch
The first end of capacitor is surveyed, the second electrode of the DC power supply is separately connected the second end of the bus capacitor, detection electricity
The first end of resistance；
The controller is also used to control the logical of the charge switch, the IGBT mould group and the three-phase power switch respectively
It is disconnected.
3. frequency converter bus capacitor on-line measuring device according to claim 2, which is characterized in that the DC power supply electricity
Road further includes charging resistor；
The first electrode of the DC power supply connects the charge switch by the charging resistor；Alternatively,
The second electrode of the DC power supply is separately connected the second end of the bus capacitor, the inspection by the charging resistor
The first end of measuring resistance.
4. according to claim 1 to frequency converter bus capacitor on-line measuring device described in 3 any one, which is characterized in that also
Including isolation circuit；
The third end of the peak detection circuit connects the controller by the isolation circuit.
5. a kind of method based on frequency converter bus capacitor on-line measuring device described in Claims 1-4 any one, special
Sign is, comprising:
It controls the IGBT mould group and the three-phase power switch disconnects；
When the voltage of the bus capacitor is lower than predeterminated voltage, controls the DC power supply circuit and charge to bus capacitor, and
When the voltage of the bus capacitor reaches the predeterminated voltage, stop the charging of the DC power supply circuit；
The bridge arm conducting for controlling any phase in the IGBT mould group, so that the bus capacitor is discharged by the IGBT mould group；
Based on the peak detection circuit when the bridge arm is connected, the peak signal that gets, the bus electricity is obtained
The internal resistance of appearance.
6. according to the method described in claim 5, it is characterized in that, being connected based on the peak detection circuit in the bridge arm
When, the peak signal that gets, the step of obtaining the internal resistance of the bus capacitor includes:
According to the peak signal, the conducting saturation voltage drop of the IGBT mould group is obtained；
The conducting saturation voltage drop is handled, transient current is obtained；
According to the peak signal and the transient current, the internal resistance is obtained.
7. according to the method described in claim 6, it is characterized in that, obtaining the IGBT mould group according to the peak signal
Be connected saturation voltage drop the step of include:
The predeterminated voltage and the peak signal are asked poor, obtain the conducting saturation voltage drop.
8. according to the method described in claim 6, obtaining transient current it is characterized in that, handle the conducting saturation voltage drop
The step of include:
Based on the conducting saturation voltage drop, inquiry obtains the transient current in predeterminated voltage current relationship table；Alternatively,
Based on the conducting saturation voltage drop, it is fitted in default IGBT voltage-current curve, obtains the transient current；Or
Person,
Based on the conducting saturation voltage drop and relational expression, the transient current is obtained；Wherein, the relational expression is that fitting is pre-
If IGBT voltage-current curve obtains.
9. according to method described in claim 6 to 8 any one, which is characterized in that according to the peak signal and the wink
State electric current, the step of obtaining the internal resistance include:
Ratio based on the peak signal and the transient current, obtains the internal resistance.
10. a kind of frequency converter, which is characterized in that including three-phase power switch, rectifier, bus capacitor, IGBT mould group and such as
Frequency converter bus capacitor on-line measuring device described in Claims 1-4 any one；
The input terminal of the three-phase power switch is for connecting three phase mains, described in the output end connection of the three-phase power switch
The input terminal of rectifier；The first electrode of the rectifier is separately connected the first end of the bus capacitor, the IGBT mould group
First end, the second electrode of the rectifier be separately connected the second end of the bus capacitor, the IGBT mould group second
End.
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| CN201811579682.0A CN109596923B (en) | 2018-12-24 | 2018-12-24 | Online detection device and method for bus capacitor of frequency converter and frequency converter |
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| CN113612424A (en) * | 2021-08-05 | 2021-11-05 | 四川虹美智能科技有限公司 | Bus capacitor capacity monitoring method of permanent magnet synchronous motor driving system |
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