CN101227168A - Apparatus and method for detecting input current of inverter - Google Patents
Apparatus and method for detecting input current of inverter Download PDFInfo
- Publication number
- CN101227168A CN101227168A CNA2007100904947A CN200710090494A CN101227168A CN 101227168 A CN101227168 A CN 101227168A CN A2007100904947 A CNA2007100904947 A CN A2007100904947A CN 200710090494 A CN200710090494 A CN 200710090494A CN 101227168 A CN101227168 A CN 101227168A
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- current
- inverter
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a detecting device of inverter input current and method thereof. The input current is estimated by information used in the spin control of the inverter, without special complicated circuit for detecting the inverter input current. The detecting device of inverter input current comprises a current detecting part for detecting the phase current of the electric machine; a pressure detecting part for detecting the direct current pressure of the inverter; a control part for calculating the command pressure of the direct current pressure and estimating the input current of the inverter by calculating the output power by the calculated command pressure and the detected phase current.
Description
Technical field
The present invention is used to detect the input current of inverter, relates in particular to not use the transducer that is used to detect input current, but utilizes command voltage and electric machine phase current to estimate the checkout gear and the method thereof of a kind of input current of inverter of input current.
Background technology
Usually, inverter is that direct current is converted to three-phase alternating current (U, V, power-converting device W) with any variable frequency.Because this device has the characteristic of saving the energy, being easy to control power output, therefore be used for driving the motor that electric equipment products such as washing machine, refrigerator, air conditioner adopt more and more.
This inverter is because the maximum permissible power of rated voltage and rated current is defined, thereby when input surpasses voltage, the electric current of rated voltage or rated current, inverter is understood can't operate as normal or break down.
Thus, for protection inverter when the electric current of being imported is non-rated current, the various devices of The real time measure input current of inverter size have been developed in succession.
As the one example, in order to measure the electric current of input inverter, current transformer (CT:CurrentTransformer) is connected to power end one side of power supply commonly used, and the AC signal that secondary winding one side of current transformer produces carried out rectification by resistance at rectifier, thereby measure the input current that is input to the power supply in the inverter.
But this prior motor drives the input current determinator with inverter, and for the input current that directly detects inverter need use special current transformer, this not only causes manufacturing cost to rise; And, for to carrying out signal processing, need to be provided with the adjunct circuit of the low pass filter (LPF) that constitutes by rectifier, smmothing capacitor and resistance from the detected electric current of current transformer, therefore there is the shortcoming of circuit complexity.
Summary of the invention
The present invention proposes in order to solve aforesaid problem, its purpose is need not be configured for detecting the special complicated circuit of input current, but utilize in the inverter Spin Control employed information to estimate the power supply input current, thereby provide the checkout gear and the method thereof of a kind of input current of inverter that can detect input current of inverter.
To achieve these goals, the invention provides a kind of checkout gear of input current of inverter, this inverter is used for motor is rotated control, and described device comprises: the current detecting part that detects described electric machine phase current; Detect the voltage detection department of described inverter direct-current voltage; And control part, this control part is for to calculate command voltage from the direct voltage that is detected, and calculated power output and estimated the input current of described inverter by the phase current of command voltage of calculating and detection.
And described current detecting part comprises the current sensor that is used to detect electric machine phase current, and the phase current that described control part goes out current sensor senses carries out coordinate transform and obtains current value, and utilizes described current value and command voltage calculation power output.
And described control part will be obtained power output P by the three-phase output voltage and the three-phase output current of inverter
oTransform to synchronous coordinate system and calculate by formula 2, its Chinese style 2 is:
In the formula, V
DeAnd V
QeRepresent the command voltage in the synchronous coordinate system respectively, I
DeAnd I
QeRepresent the actual current in the synchronous coordinate system respectively.
And, described control part is by command voltage that is equivalent to the inverter three-phase output voltage and the phase current calculation power output that is equivalent to inverter three-phase output current, and utilize the phase current of the described inverter power supply of formula 5 estimation input by the power output of calculation, its Chinese style 5 is:
In the formula, V
DeAnd V
QeRepresent the command voltage in the synchronous coordinate system respectively, I
DeAnd I
QeRepresent the actual current in the synchronous coordinate system respectively, V
sAnd I
sBe respectively the effective value of input voltage and input current, PF represents power factor.
And power factor PF numerical value is for preestablishing according to the system's service conditions that adopts inverter in the described formula 5.
And, also comprise the reactor that is used to improve power factor, and described control part is stored the form data that concern between power output and the power factor in advance.
And, the invention provides a kind of detection method of input current of inverter, this inverter is used for motor is rotated control, and described method comprises step: the phase current that detects described motor; Detect described inverter direct-current voltage; Calculate command voltage from the direct voltage that is detected, and estimate the input current of described inverter by the phase current calculation power output of command voltage of calculating and detection.
Description of drawings
The circuit diagram that is used to detect input current of inverter that Fig. 1 is provided for the foundation embodiment of the invention;
Fig. 2 is for being used to detect the vector control structure chart of input current in the inverter provided by the present invention;
Fig. 3 is according in the inverter provided by the present invention, the simulation result oscillogram when ignoring the loss of power semiconductor power consumption;
Fig. 4 is according in the inverter provided by the present invention, the simulation result oscillogram when considering the loss of power semiconductor power consumption;
Fig. 5 is the estimation electric current of inverter more provided by the present invention and the oscillogram of surveying error between the input current.
Main symbol description: 20 are power supply commonly used, and 22 is rectifier, and 24 is reactor, 26 is Switching Power Supply, 28 is smmothing capacitor, and 30 is inverter, and 32 is motor, 34 is current sensor, 36 is voltage sensor, and 40 is control part, and 54 is the vector power exerciser, 56 is the voltage estimate device, and 58 are electric current estimation device.
Embodiment
Describe embodiments of the invention with reference to the accompanying drawings in detail.
The circuit diagram that is used to detect input current of inverter that Fig. 1 is provided for the foundation embodiment of the invention.
As shown in Figure 1, the circuit that is used to detect inverter 30 input currents comprises the current sensor 34 that is used to detect motor 32 phase currents and voltage sensor 36 by inversion system (invertersystem) and constitutes, wherein inversion system comprises: rectifier 22 is used for the power supply commonly used 20 with alternating current supplies such as 220V, 60Hz is carried out full-wave rectification; Be positioned at the reactor (reactor) 24 of described rectifier 22 rear ends, to be used to improve power factor (power factor); Be connected in the Switching Power Supply (SMPS:Switching Mode Power Supply) 26 of described rectifier 22, to be used to export the reference voltage of pre-sizing; Be connected in the smmothing capacitor 28 of described rectifier 22, be converted into direct current to be used for that the voltage that rectifier 22 is exported is carried out advection; Inverter 30, (U, V W) drive brshless DC motor 32 (hereinafter referred to as motor) to be used for being transformed to the three-phase alternating current of the pulse mode with any variable frequency by the direct voltage of described smmothing capacitor 28 outputs by pulse width modulation (PWM); Control part 40 comes control inverter 30 with the pwm signal figure (pattern) that is used for being supplied in by output described inverter 30.
Described inverter 30 is to be connected into three phase full bridge circuit (Full Bridge) and direct voltage is converted to three-phase alternating current by 6 switch elements (IGBT) and 6 diodes (FRD), is a kind of common switching circuit that this three-phase alternating current is supplied in motor 32.
Described current sensor 34 is to be used to control motor 32 rotating speeds and to be used in common inversion system, can be made of a certain known manner.
For example, its formation can for: on the three-phase of motor 32, utilize shunting (shunt) resistance of current transformer or series connection directly to detect the mode of three-phase current respectively; Perhaps detect biphase current, and remain the mode of a phase current according to detected biphase current value estimation by two current transformers or series connection shunt resistance.
Described voltage sensor 36 is connected in smmothing capacitor 28, with dc tache voltage (the DC link voltage) V at described smmothing capacitor 28 two ends that are used for being detected
DcBe sent to control part 40.This voltage sensor 36 can utilize common voltage sensor to realize.
Described control part 40 is ON/OFF (on/off) of 6 switch elements of control inverter 30, and produces the microcomputer (MCU) with free voltage and optional frequency three-phase alternating current.Because this is to use the general fashion of PWM control, so omit its detailed description at this.
And described control part 40 is for the Spin Control of inverter 30, by the direct voltage V at voltage sensor 36 monitoring smmothing capacitors 28 two ends
Dc, and, export the pwm signal figure that is supplied in inverter 30 with this by current sensor 34 monitoring motors 32 phase currents.
Fig. 2 is for being used to detect the vector control structure chart of input current in the inverter provided by the present invention.
As shown in Figure 2, the control part 40 that is used for measuring inverter 30 input currents comprises: speed command generator 42; According to the speed command of described speed command generator 42 and the speed control 44 of velocity estimation value output current instruction; Current controller 46 according to the current-order output voltage of described speed control 44; Voltage coordinate converter 48 is used for the output voltage of described current controller 46 is carried out coordinate transform is supplied in motor 32 with output voltage; Electric current coordinate converter 50 is used for carrying out coordinate transform to what be supplied in described motor 32 by described current monitor 34 detected electric currents; Rotor position detector 52, be used to use the magnitude of voltage of the current value of described electric current coordinate converter 50 outputs and 46 outputs of described current controller to detect the rotor-position of described motor 32, and the velocity estimation value is sent to described speed control 44, location estimate is sent to electric current coordinate converter 50; Vector power exerciser 54 is to be used to the utilizing phase current of described electric current coordinate converter 50 outputs and the command voltage of described current controller 46 outputs to calculate the power P that outputs to motor 32
oFrom direct voltage V
DcThe voltage estimate device 56 of estimation input voltage; Electric current estimation device 58 is to be used for estimating the primary current that is input to inverter 30 from the power of described vector power exerciser 54 calculations and/or the input voltage estimated value of described voltage estimate device 56 outputs.
The following describes the course of work and the action effect of aforesaid inverter input current detecting device and method thereof.
In Fig. 1, when dropping into power supply 20 commonly used, with the power supply commonly used 20 of ac modes such as 220V, 60Hz supply at rectifier 22 by rectification, carry out advection and be converted to the output direct current by the smmothing capacitor 28 that is connected in rectifier 22 again.
The direct voltage of described smmothing capacitor 28 outputs is transformed to the three-phase alternating current with any variable frequency at inverter 30 by pulse-width modulation and is fed to motor 32, and drive motors 32 thus.
At this moment, control part 40 is connected in the direct voltage V of smmothing capacitor 28 for the Spin Control of inverter 30 by voltage sensor 36 monitorings
Dc,, control the pwm signal figure that is fed to inverter 30 with this by the phase current of current sensor 34 monitoring motors 32.
In order to control the pwm signal figure that is fed to described inverter 30, need The real time measure to be input to the size of current of inverter 30, this is illustrated with reference to Fig. 2.
In Fig. 2, be fed to the power P of motor 32 from inverter 30
oShown in 1.
P
o＝V
a·I
a+V
b·I
b+V
c·I
c (1)
In the formula, V
a, V
b, V
cBe the three-phase output voltage of inverter 30, I
a, I
b, I
cThree-phase output current for inverter 30.
If formula 1 is transformed to synchronous coordinate system, then as shown in the formula shown in 2.
In the formula, V
DeAnd V
QeBe respectively the command voltage in the synchronous coordinate system, I
DeAnd I
QeRepresent the actual current in the synchronous coordinate system respectively.
And, the power output P of inverter 30
oCan also obtain by the dc tache voltage of inverter 30 and the current effective value of DC link (RMS value).Ask the DC link current effective value to need complicated calculation process.Therefore, use above-mentioned formula 2 for the inverter 30 of vector control mode shown in Figure 2 and calculate power output P
oComparatively convenient.Be that the loss that takes place on loss and 6 switch elements that constitute inverter 30 of diode rectifier 22 of direct current is compared very little by inverter 30 with exchange conversion.As mentioned above, using command voltage in the formula 2, is not actual output voltage.
Therefore, can think the power output P that calculates by formula 2
oComprise inverter 30 losses.If can ignore the loss of diode rectifier 22, as shown in the formula 3 input power P
iWith power output P
oNumerical value is identical.
P
i＝V
s·I
s·PF＝P
o (3)
Following formula 3 is a benchmark with the single phase poaer supply system, V
sAnd I
sBe respectively the effective value of input voltage and input current, PF (Power Factor) represents power factor.For three-phase power supply system, can derive following formula 4.
In the following formula 4, V
LLThe effective value of expression voltage between lines.
For the single phase poaer supply system, can derive the following formula 5 that calculates primary current (input current) by following formula 3.
If the instantaneous value of known dc tache voltage and power factor then can obtain V by the instantaneous value of dc tache voltage in the following formula 5
s
For inversion system of the present invention, owing to have additional reactor 24 at power input, the therefore higher power factor of most of zone maintenance except low load area.In order to use power factor value more accurately, the relation table between power output and the power factor can be formatted, so that table look-up (look-up) uses.
And when also having current consuming apparatus such as fan except inverter 30, following formula 5 changes following formula 6 into.
In the following formula 6, P
aBe the summation that miscellaneous part consumes electric power except that inverter 30, equally can formization and be convenient to table look-up (look-up) use.
In order to check the validity of primary current evaluation method proposed by the invention, utilize PSIM to carry out simulation process between power output Pout and the power output Pin_est that calculated whether error taking place, its result is as shown in Figure 3 and Figure 4.
Fig. 3 is the simulation result waveform when ignoring 6 switch elements (power semiconductor) power consumption that constitutes inverter 30, the simulation result waveform of Fig. 4 when consider constituting 6 switch elements (power semiconductor) power consumption of inverter 30.
Comparison diagram 3 and Fig. 4 as can be known, the power output Pin_est that is calculated is not subjected to the influence of switch element power loss.
Therefore, as mentioned above when using command voltage to calculate power output because inverter 30 losses are included in the power output of calculating, even thereby not taking into account inverter 30 efficient also can estimate primary current more exactly.
Fig. 5 is when inverter of the present invention is applied the 9Nm load, relatively the oscillogram of input current (measured current) error of primary current of being estimated and practical measurement.Hence one can see that, need not factors such as taking into account inverter 30 efficient and motor 32 efficient, even the estimation input current under weak magnetic flux operation is also within error range.
Hence one can see that, and inversion system of the present invention does not use the complicated circuit of measuring input current and the result who obtains is almost consistent with the practical measurement result.
In addition, though illustrated in the embodiment of the invention by inverter 30 direct voltages and motor 32 phase currents calculation power output P
o, and utilize power output P
oThe mode of estimation inverter 20 input phase currents, but the present invention is not limited thereto, also can be by the current effective value calculation power output P of inverter 30 DC link
o, and utilize power output P
oEstimation inverter 30 input phase currents.
In sum, according to inverter input current detecting device provided by the present invention and method thereof, do not have Need be configured for detecting the special complicated circuit of input current, institute makes in the inverter rotation control but utilize With information estimate the input current of power supply, thereby have the described inverter of the Accurate Determining of being convenient to input electricity The effect of stream.
Claims (7)
1. the checkout gear of an input current of inverter, this inverter is used for motor is rotated control, and described device comprises:
Detect the current detecting part of described electric machine phase current;
Detect the voltage detection department of described inverter direct-current voltage; And
Control part, this control part be for to calculate command voltage from the direct voltage that is detected, and estimated the input current of described inverter by the phase current calculation power output of command voltage of calculating and detection.
2. the checkout gear of input current of inverter according to claim 1, it is characterized in that described current detecting part comprises the current sensor that is used to detect electric machine phase current, and the phase current that described control part goes out current sensor senses carries out coordinate transform and obtains current value, and utilizes described current value and command voltage calculation power output.
3. the checkout gear of input current of inverter according to claim 1 is characterized in that described control part will obtain power output P by the three-phase output voltage and the three-phase output current of inverter
oTransform to synchronous coordinate system and calculate by formula 2, its Chinese style 2 is:
In the formula, V
DeAnd V
QeRepresent the command voltage in the synchronous coordinate system respectively, I
DeAnd I
QeRepresent the actual current in the synchronous coordinate system respectively.
4. the checkout gear of input current of inverter according to claim 3, it is characterized in that described control part is by command voltage that is equivalent to the inverter three-phase output voltage and the phase current calculation power output that is equivalent to inverter three-phase output current, and utilize the phase current of the described inverter power supply of formula 5 estimation input by the power output of calculation, its Chinese style 5 is:
In the formula, V
DeAnd V
QeRepresent the command voltage in the synchronous coordinate system respectively, I
DeAnd I
QeRepresent the actual current in the synchronous coordinate system respectively, V
sAnd I
sBe respectively the effective value of input voltage and input current, PF represents power factor.
5. the checkout gear of input current of inverter according to claim 4 is characterized in that power factor PF numerical value is for preestablishing according to the system's service conditions that adopts inverter in the described formula 5.
6. the checkout gear of input current of inverter according to claim 1 it is characterized in that also comprising the reactor that is used to improve power factor, and described control part is stored the form data that concern between power output and the power factor in advance.
7. the detection method of an input current of inverter, this inverter is used for motor is rotated control, and described method comprises step:
Detect the phase current of described motor;
Detect described inverter direct-current voltage;
Calculate command voltage from the direct voltage that is detected, and estimate the input current of described inverter by the phase current calculation power output of command voltage of calculating and detection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070005743 | 2007-01-18 | ||
| KR1020070005743A KR20080068254A (en) | 2007-01-18 | 2007-01-18 | Apparatus for detecting input current of inverter and method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101227168A true CN101227168A (en) | 2008-07-23 |
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ID=39822107
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100904947A Pending CN101227168A (en) | 2007-01-18 | 2007-04-12 | Apparatus and method for detecting input current of inverter |
Country Status (2)
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|---|---|
| KR (1) | KR20080068254A (en) |
| CN (1) | CN101227168A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102004229A (en) * | 2010-09-30 | 2011-04-06 | 深圳美凯电子股份有限公司 | System and method for testing network combination photovoltaic inverter |
| CN105723233A (en) * | 2014-03-07 | 2016-06-29 | 东芝三菱电机产业系统株式会社 | Inverter testing apparatus |
| CN107966606A (en) * | 2017-11-23 | 2018-04-27 | 国网四川省电力公司电力科学研究院 | A kind of electric system high-voltage shunt reactor overcurrent false alarm method of discrimination |
| CN111490673A (en) * | 2020-05-21 | 2020-08-04 | 四川虹美智能科技有限公司 | Output voltage control method and device |
| CN113661623A (en) * | 2019-04-11 | 2021-11-16 | Ls电气株式会社 | Overcurrent protection inverter |
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| CN102636760B (en) * | 2012-03-29 | 2014-08-06 | 威凡智能电气高科技有限公司 | Chain link ageing testing device for chain type inverter systems and method |
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-
2007
- 2007-01-18 KR KR1020070005743A patent/KR20080068254A/en not_active Application Discontinuation
- 2007-04-12 CN CNA2007100904947A patent/CN101227168A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102004229A (en) * | 2010-09-30 | 2011-04-06 | 深圳美凯电子股份有限公司 | System and method for testing network combination photovoltaic inverter |
| CN102004229B (en) * | 2010-09-30 | 2013-04-17 | 深圳美凯电子股份有限公司 | System and method for testing network combination photovoltaic inverter |
| CN105723233A (en) * | 2014-03-07 | 2016-06-29 | 东芝三菱电机产业系统株式会社 | Inverter testing apparatus |
| CN107966606A (en) * | 2017-11-23 | 2018-04-27 | 国网四川省电力公司电力科学研究院 | A kind of electric system high-voltage shunt reactor overcurrent false alarm method of discrimination |
| CN107966606B (en) * | 2017-11-23 | 2019-11-12 | 国网四川省电力公司电力科学研究院 | A kind of electric system high-voltage shunt reactor overcurrent false alarm method of discrimination |
| CN113661623A (en) * | 2019-04-11 | 2021-11-16 | Ls电气株式会社 | Overcurrent protection inverter |
| CN113661623B (en) * | 2019-04-11 | 2024-05-24 | Ls电气株式会社 | Overcurrent protection inverter |
| CN111490673A (en) * | 2020-05-21 | 2020-08-04 | 四川虹美智能科技有限公司 | Output voltage control method and device |
| CN111490673B (en) * | 2020-05-21 | 2021-02-09 | 四川虹美智能科技有限公司 | Output voltage control method and device |
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|---|---|
| KR20080068254A (en) | 2008-07-23 |
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