CN103731015B - Inhibit the current feedback active power filter of frequency conversion speed-adjusting system common-mode voltage - Google Patents
Inhibit the current feedback active power filter of frequency conversion speed-adjusting system common-mode voltage Download PDFInfo
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- CN103731015B CN103731015B CN201410026716.9A CN201410026716A CN103731015B CN 103731015 B CN103731015 B CN 103731015B CN 201410026716 A CN201410026716 A CN 201410026716A CN 103731015 B CN103731015 B CN 103731015B
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Abstract
The present invention relates to the current feedback active power filters for inhibiting frequency conversion speed-adjusting system common-mode voltage, by common mode current sensor, Current amplifier and processing circuit, and power amplification circuit, resistance R1, capacitance C1It is constituted with four winding common mode transformers.The measuring signal of common mode current sensor passes through Current amplifier and processing circuit processes, then by bipolarity power npn transistor T1With bipolarity positive-negative-positive power transistor T2The power amplification circuit of composition amplifies, and drives the main side inductance of four winding common mode transformations, resistance R1With capacitance C1The series arm of composition, the branch show as purely resistive under common-mode voltage frequency.Four winding common mode transformers it is main while voltage change it is secondary to be connected on frequency converter output loop three by Mutual Inductance Coupling while on, the influence of suppression common mode voltage.The filter solves the problems, such as that frequency converter output voltage influences performance of filter by voltage detecting network, while eliminating the phase delay of power amplification circuit.
Description
Technical field
The present invention relates to the current feedback active power filters for inhibiting frequency conversion speed-adjusting system common-mode voltage, belong to application of frequency converter
Technical field.
Background technology
At present frequency control field using it is relatively broad be two level PWM of three-phase（Pulse Width
Modulation, pulsewidth modulation）Frequency converter.Its basic principle is pulse length modulation principle, that is, utilizes frequency converter three-phase bridge arm total
The action of the certain sequence and time interval of six switches is so that output voltage acts on the effect and three-phase of motor stator winding
Sine wave is identical.The strategy of switch motion is known as pulse duration modulation method.Two level PWM frequency conversion speed-adjusting system of typical three-phase is as schemed
Shown in 1, wherein 1 is two level PWM frequency converter of three-phase, 2 export transformer for three-phase, and 3 be alternating current generator, and 4 be DC voltage
Udc, 5 be common mode current ic, L2Transformer inductance value, L are exported for three-phase3It is exchange for Stator Windings of AC Motor inductance value, 13
Coupled capacitor C between motor stator winding neutral point and groundg.O points are motor housing earth point, and F points are frequency converter earth point.
Two level PWM frequency converter of three-phase is frequently with sinusoidal pulse width modulation method（Sinusoidal Pulse Width
Modulation, SPWM）Or space vector width pulse modulation method (Space Vector Pulse Width Modulation,
SVPWM).Both methods can make that there are intrinsic common-mode voltages between Stator Windings of AC Motor neutral point and ground level.
The size of common-mode voltage can be obtained by eight basic switch states of two level PWM frequency converter of three-phase, this eight basic switches
State corresponds to four common mode electrical levels, i.e. ± Udc/ 2 and ± Udc/6.Typical common-mode voltage waveform is as shown in Figure 2.
Common-mode voltage is applied between Stator Windings of AC Motor neutral point and motor housing earth point.Alternating-current motor stator
It can be equivalent to that there are coupled capacitor C between winding neutral point and motor housing earth pointg.When frequency converter switching frequency is larger, altogether
The voltage conversioning rate of mode voltage can be bigger.Due to coupled capacitor CgPresence, common-mode voltage can be in frequency converter and motor
Cause larger transient current between ground level, as shown in 5 in Fig. 1.Two level PWM frequency conversion speed-adjusting system (Fig. 1 of typical three-phase
It is shown) common mode equivalent circuit it is as shown in Figure 3.Wherein 6 be common-mode voltage.Same Fig. 1 of remaining part meaning in figure.
This transient current can cause the damage of motor bearings, the reduction of service life；Secondly, it can also cause frequency converter
Voltage difference between earth point and motor earth point, to cause the interference of the control voltage to control system；Finally, its height
Frequency part can carry out Electromagnetic Launching by antenna in some cases, form interference to the weak link of system, influence system
Normal operation.
In order to improve the life and reliability of frequency conversion speed-adjusting system, it is necessary to inhibit to the common-mode voltage of system.It is existing
The method of suppression common mode voltage can be divided into two classes.
A kind of method is to reduce common-mode voltage by changing pulsewidth modulation strategy, and the main starting point of this method is in mesh
It marks and is superimposed a common-mode voltage on modulation voltage to offset the influence of intrinsic common-mode voltage.Such as Publication No. CN101359881
Patent of invention just belong to such：The application for a patent for invention discloses a kind of based on minimum common mode transient voltage superimposed pulsewidth tune
Method processed, it is improved traditional space vector width pulse modulation method, and one is superimposed by the desired value to phase voltage
A minimum common-mode voltage so that the common mode voltage reduction of system.The patent of invention of Publication No. CN101860319A proposes separately
A kind of pulse duration modulation method carrys out suppression common mode voltage, improves DC voltage utilization rate by being superimposed DC component, then straight in superposition
A kind of novel modulated signal is constructed on the basis of flow component, it is suppressed that the common-mode voltage of high-power inverter.
Additional hardware need not be increased by reducing the method for common-mode voltage by changing pulsewidth modulation strategy, and cost is relatively low.
But there is also some disadvantages, such as due to modulation strategy complexity, it is more demanding to the computing capability of controller；The counteracting of superposition
The component of common-mode voltage can reduce the utilization rate of DC voltage；Finally, the non-ideal characteristic of high-power switch device, such as dead zone
The performance of such methods can largely be influenced.
Another kind of method is by increasing active or passive filter come suppression common mode voltage.Although this method needs to increase
Filter hardware, but while suppression common mode voltage, the DC voltage utilization rate of system is not interfered with, it will not be to switching device
Additional burden is caused, has positive meaning to improving system lifetim and reliability.Wherein, active power filtering method compared to
Passive filtering method parameter designs more flexible, volume smaller, and cost is lower.
The patent of invention of Publication No. CN1697306A discloses a kind of Voltage Feedback active filter, its basic principle
It is to detect network by common-mode voltage to obtain common-mode voltage, is then amplified by power amplification circuit, to which four windings of control are total
Voltage on moding depressor is allowed to the intrinsic common-mode voltage of bucking-out system.The Active filter is as shown in figure 4,3 meanings are same
Fig. 1, the same Fig. 3 of 6 meanings, 2 be output transformer, is different from the three-winding transformer of Fig. 1,2 indicates four winding transformers herein, by
It is the critical component of the suppression common mode voltage in it, which is referred to as four winding common mode transformers.7 have for Voltage Feedback
Source filter agent structure, wherein common-mode voltage detection network 8 are made of three branches, i.e. resistance R1With capacitance C1The of composition
One branch, resistance R2With capacitance C2The second branch of composition, resistance R3With capacitance C3The third branch of composition.Power amplification circuit
By bipolarity power npn transistor T1With bipolarity positive-negative-positive power transistor T2Composition.The output of power amplification circuit is four
The main side of winding common mode transformer.
The common-mode voltage for the Voltage Feedback active filter that the patent of invention of Publication No. CN1697306A proposes detects net
It is connected directly between network and frequency converter output loop, when common-mode voltage detects the resistance capacitance parameter of three branches of network in the presence of poor
Different time, the output voltage of frequency converter are easy to enter bipolarity power npn transistor T by common-mode voltage detection network1With
Bipolarity positive-negative-positive power transistor T2The input terminal of the power amplification circuit of composition influences the normal operation of circuit.
On the other hand, the power for the Voltage Feedback active filter that the patent of invention of Publication No. CN1697306A proposes is put
The load of big circuit is that inductive load causes supporting for common-mode voltage so that there are phase delays for power amplification circuit part
Disappear there are phase delay, to influence the performance of the Voltage Feedback active filter.
Invention content
Common-mode voltage when the purpose of the present invention is to inhibit frequency conversion speed-adjusting system sinusoidal pulse width modulation or space vector modulation
Harm, solve Voltage Feedback Design of Active Filter in, frequency converter output voltage by voltage detecting network enter active filter
The problem of wave device and then influence filter normal operation, while striving for the influence of counteracting common-mode voltage more synchronized.
The current feedback active power filter proposed by the present invention for inhibiting frequency conversion speed-adjusting system common-mode voltage, is passed by common mode current
Sensor, Current amplifier and processing circuit, power amplification circuit, resistance R1, capacitance C1It is constituted with four winding common mode transformers.Common mode
The common mode current i of the three-phase output loop of current sensor measurement frequency conversion speed-adjusting systemc, obtained measuring signal is current signal
nic, n is the gain of common mode current sensor, is constant；Current signal nicIt, should into the Current amplifier and processing circuit of rear class
Partial gain is K1, export as current signal i1；Current signal i1Pass through bipolarity power npn transistor T1And bipolarity
Positive-negative-positive power transistor T2Base stage enter rear class power amplification circuit, power amplification circuit is by bipolarity NPN type power crystal
Pipe T1, bipolarity positive-negative-positive power transistor T2, DC power supply VCCWith DC power supply-VCCComposition, wherein bipolarity NPN type power
Transistor T1Base stage and bipolarity positive-negative-positive power transistor T2Base stage be connected, bipolarity power npn transistor T1Penetrate
Pole and bipolarity positive-negative-positive power transistor T2Emitter-base bandgap grading be connected, DC power supply VCCConnect bipolarity power npn transistor T1's
Collector, DC power supply-VCCConnect bipolarity positive-negative-positive power transistor T2Collector；The load of power amplification circuit is total
The main side of moding depressor, capacitance C1With resistance R1Series arm, the series arm one end be bipolarity power npn transistor
T1Emitter-base bandgap grading and bipolarity positive-negative-positive power transistor T2The tie point of emitter-base bandgap grading, other end ground connection；The secondary side of three of common mode transformer
It is connected on respectively in the three-phase output loop of frequency conversion speed-adjusting system, the Same Name of Ends on the secondary side of common mode transformer three and frequency control system
The frequency converter side of system is connected, Same Name of Ends and the bipolarity power npn transistor T on the main side of common mode transformer1Emitter-base bandgap grading and bipolar
Property positive-negative-positive power transistor T2The tie point of emitter-base bandgap grading is connected.Specific connection type is as shown in Figure 5.Wherein：3,6 and 13 meanings are same
Fig. 3, the same Fig. 4 of 2 meanings, 9 be current feedback active power filter proposed by the present invention, and 10 be common mode current sensor, and 11 be electric current
Amplification and processing circuit, 12 be the load circuit of power amplification circuit.
The basic principle of the current feedback active power filter is as follows：As common-mode voltage UciWhen increase, common mode current icIncrease,
Common mode current sensor output signal nicIncrease, Current amplifier and processing circuit output current i1Increase, power amplification circuit is defeated
Enter electric current increase, the main side electric current of common mode transformer increases, thus by Mutual Inductance Coupling in common mode transformer pair side L2On voltage
Increase, offsets common-mode voltage UciValue added reduce so that acting on common-mode voltage on motor.
The load of the power amplification circuit of the current feedback active power filter is the main side inductance of four winding common mode transformers
L1, resistance R1With capacitance C1Series connection.Wherein C1Meet following formula：
（1）
Wherein ωcFor the circular frequency of common-mode voltage.Under the frequency of common-mode voltage, power amplification circuit meets formula（1）'s
Load shows as purely resistive, and power amplification circuit part no longer has phase delay, so that the active filter can be more
The good timely influence for offsetting common-mode voltage.
According to Kirchhoff's second law, in complex frequency domain, which meets following equation：
（2）
（3）
Wherein s is Laplace operator；Uci(s), I1(s) and Ic(s) it is time-domain signal common-mode voltage U respectivelyci, power
Amplifying circuit input current i1With common mode current icComplex frequency domain expression；β is the current amplification factor of power amplification circuit, is
Constant；M is the mutual inductance of common mode reactor；L2For common mode transformer secondary inductance value；L3For three-phase motor stator inductance value；CgFor
Coupled capacitor between Stator Windings of AC Motor neutral point and ground level；R2For the resistance of frequency converter output loop；N is common mode
Current sensor gain, K1(s) be Current amplifier and processing circuit gain.
By formula（3）Substitution formula（2）, can obtain
（4）
Above formula shows by selecting common mode current sensor gain n appropriate, power amplification circuit currentgainβ and electricity
Banish big and processing circuit K1（s）, can be very good the common mode current of suppression common mode voltage generation.
The advantageous effect of the present invention compared with prior art is：Current feedback is carried out using common mode current sensor, is cut
The frequency converter three-phase output voltage that broken is directly entered the access of active filter so that power amplification circuit is not exported by frequency converter
Voltage directly affects.
Secondly, the invention has been connected resistance R in the load of power amplification circuit1With capacitance C1, by selecting electricity appropriate
Hold so that under the frequency of common-mode voltage, load circuit shows as purely resistive, eliminates phase delay, can be more synchronous support
Disappear the influence of common-mode voltage.
Again, which has fully considered motor stator neutral point when describing common-mode voltage inhibition problem in design
Coupled capacitor C between ground levelgInfluence so that the design of filter more meets engineering practice.
Finally, the final purpose of suppression common mode voltage is to eliminate electromagnetic interference.And the direct sources of electromagnetic interference are
Transient current between frequency converter circuit and ground level.Patent of invention compared to Publication No. CN1697306A is for common mode electricity
The active filter of design, the present invention is pressed to be directed to the active filter that common mode current directly designs, it will reaching preferably prevents
The effect of electromagnetic interference.
Description of the drawings
Fig. 1 is two level PWM frequency conversion speed-adjusting system of typical three-phase.
Wherein：Wherein 1 is two level PWM frequency converter of three-phase, and 2 be output transformer, and 3 be alternating current generator, and 4 be DC side electricity
Press Udc, 5 be common mode current ic, L2To export transformer inductance value, L3For motor stator winding reactance value.O points connect for motor housing
Place, F points are frequency converter earth point.
Fig. 2 is typical common-mode voltage waveform.
Fig. 3 is the common mode equivalent circuit of two level PWM frequency conversion speed-adjusting system (shown in Fig. 1) of typical three-phase.Wherein：2,3
It is equivalent common-mode voltage with same Fig. 1 of 5 meanings, 6.
Fig. 4 is the structure of Voltage Feedback active filter disclosed in the patent of invention of Publication No. CN1697306A.Wherein：
The same Fig. 1 of 3 meanings, the same Fig. 3 of 6 meanings, 2 be output transformer, is different from the three-winding transformer of Fig. 1,2 indicates that four windings become herein
Depressor, since it is the key element of the suppression common mode voltage filter, which is referred to as four winding common mode transformers.
7 be Voltage Feedback active filter agent structure, and 8 detect network for common-mode voltage.
Fig. 5 is the structural schematic diagram of current feedback active power filter proposed by the present invention.Wherein：3,6 and 13 meanings are the same as figure
The same Fig. 4 of 3,2 meanings, 9 be current feedback active power filter proposed by the present invention, and 10 be common mode current sensor, and 11 put for electric current
Big and processing circuit, 12 be the load circuit of power amplification circuit.
Specific implementation mode
Present embodiment is by taking Current amplifier in Fig. 5 and processing circuit are only made of amplifier and integrator as an example.Electric current is put
Big and processing circuit can also be selected as other forms, and only filter parameter design is more increasingly complex.
Current amplifier and processing circuit are only made of amplifier and integrator, then its gain K1（s）Meet following formula：
（5）
Wherein K11It is constant for current amplifier gain；K12It is constant for integrator gain.By formula（5）Substitution formula
（4）, can obtain：
（6）
Formula（6）It can be written as form：
（7）
Wherein K=n β MK11+L2+2M+L3。
（8）
（9）
ωnFor the resonant frequency of the active filter, ζ is the damped coefficient of the active filter.Select suitable electric current
Amplification and processing circuit amplifier gain K11With Current amplifier and processing circuit integrator gain K12, the second order can be made to have
Source filter reaches desired performance.
Steps are as follows for the parameter designing of the active filter of the present invention：
Step 1：Capacitance C between generator neutral point and groundgIn Practical Project, it is not generally available its exact value, but
Its order of magnitude range can be determined by voltage change ratio and common mode current instantaneous peak value.According to formula（8）Select suitable electric current
Amplifier gain K11So that ωnMuch smaller than the circular frequency ω of common-mode voltagec。
Step 2：The damping coefficientζ of suitable active filter is selected, 0.7 or so is generally taken in engineering, according to formula（9）Meter
Calculation obtains integrator gain K12。
Claims (1)
1. inhibiting the current feedback active power filter of frequency conversion speed-adjusting system common-mode voltage, by common mode current sensor, Current amplifier
And processing circuit, power amplification circuit, resistance R1, capacitance C1It is constituted with four winding common mode transformers, common mode current sensor measures
The common mode current i of the three-phase output loop of frequency conversion speed-adjusting systemc, obtained measuring signal is current signal nic, n is common mode current
The gain of sensor is constant；Current signal nicInto the Current amplifier and processing circuit of rear class, the gain of the part is K1,
Output is current signal i1；Current signal i1Pass through bipolarity power npn transistor T1With bipolarity positive-negative-positive power transistor
T2Base stage enter rear class power amplification circuit, power amplification circuit is by bipolarity power npn transistor T1, bipolarity positive-negative-positive
Power transistor T2, DC power supply VCCWith DC power supply-VCCComposition, wherein bipolarity power npn transistor T1Base stage and
Bipolarity positive-negative-positive power transistor T2Base stage be connected, bipolarity power npn transistor T1Emitter-base bandgap grading and bipolarity positive-negative-positive work(
Rate transistor T2Emitter-base bandgap grading be connected, DC power supply VCCConnect bipolarity power npn transistor T1Collector, DC power supply-
VCCConnect bipolarity positive-negative-positive power transistor T2Collector；The load of power amplification circuit is the main side of common mode transformer, electricity
Hold C1With resistance R1Series arm, the series arm one end be bipolarity power npn transistor T1Emitter-base bandgap grading and bipolarity
Positive-negative-positive power transistor T2The tie point of emitter-base bandgap grading, other end ground connection；The secondary side of three of common mode transformer is connected on change frequency modulation respectively
In the three-phase output loop of speed system, the secondary Same Name of Ends on side of common mode transformer three and the frequency converter side phase of frequency conversion speed-adjusting system
Even, the Same Name of Ends with bipolarity power npn transistor T on the main side of common mode transformer1Emitter-base bandgap grading and bipolarity positive-negative-positive power crystal
Pipe T2The tie point of emitter-base bandgap grading is connected, and the current feedback active power filter meets：
I1(s)=K1(s)nIc(s) (2)
Wherein s is Laplace operator, Uci(s),I1(s) and Ic(s) it is respectively time-domain signal common-mode voltage Uci, power amplification electricity
Road input current i1With common mode current icComplex frequency domain expression, β is the current amplification factor of power amplification circuit, and M is common mode reactance
The mutual inductance of device, L2For common mode transformer secondary inductance value, L3For three-phase motor stator inductance value, CgFor Stator Windings of AC Motor
Coupled capacitor between neutral point and ground level, R2For the resistance of frequency converter output loop, n is common mode current sensor gain, K1
(s) it is the gain of Current amplifier and processing circuit, it is characterised in that：
The main side inductance L of the load of power amplification circuit, i.e. common mode transformer1, capacitance C1With resistance R1Series arm impedance,
It is purely resistive on the Frequency point of common mode current；
Current amplifier and processing circuit are made of amplifier and integrator, and amplifier gain K11Meet
Wherein K=n β MK11+L2+2M+L3, ωnFor the resonant frequency of the active filter, ωcFor the circular frequency of common-mode voltage.
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| CN104410262A (en) * | 2014-12-01 | 2015-03-11 | 沈阳工业大学 | Device capable of eliminating common-mode voltage of frequency converter |
| US9882464B1 (en) | 2016-12-12 | 2018-01-30 | General Electric Company | System for filtering high frequency noise components and an associated method thereof |
| CN108896846B (en) * | 2018-06-01 | 2020-11-13 | 中国人民解放军海军工程大学 | Device and method for measuring conducted interference of high-voltage system |
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| US6028405A (en) * | 1998-01-14 | 2000-02-22 | Yaskawa Electric America, Inc. | Variable frequency drive noise attenuation circuit |
| EP1143602A2 (en) * | 2000-03-28 | 2001-10-10 | International Rectifier Corporation | Active filter for reduction of common mode current |
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| CN101527505A (en) * | 2009-03-31 | 2009-09-09 | 西安交通大学 | Disturbance voltage attenuation device |
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| CN103477544A (en) * | 2011-02-14 | 2013-12-25 | 凯利捷投资有限公司 | Common-mode filter device and system |
| CN203911739U (en) * | 2014-01-21 | 2014-10-29 | 江苏优控新能源科技有限公司 | Current-feedback active filter inhibiting common-mode voltage of variable-frequency speed control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101247074B (en) * | 2008-03-17 | 2010-09-22 | 王尺 | Power-saving device and production method for AC electric appliance |
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| US6028405A (en) * | 1998-01-14 | 2000-02-22 | Yaskawa Electric America, Inc. | Variable frequency drive noise attenuation circuit |
| EP1143602A2 (en) * | 2000-03-28 | 2001-10-10 | International Rectifier Corporation | Active filter for reduction of common mode current |
| CN1697306A (en) * | 2005-04-26 | 2005-11-16 | 哈尔滨理工大学 | Transducer of active lowpass filter of taking feedback |
| CN102342010A (en) * | 2009-03-05 | 2012-02-01 | 三菱电机株式会社 | Leakage current reduction device |
| CN101527505A (en) * | 2009-03-31 | 2009-09-09 | 西安交通大学 | Disturbance voltage attenuation device |
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Effective date of registration: 20190102 Address after: Room 317, Building B1, Yichuang Park, 19 Pusi Road, Taishan Street, Pukou District, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing Beckler Intelligent Technology Co., Ltd. Address before: 215021 E101-16, 1355 Jinjihu Avenue, Suzhou Industrial Park, Jiangsu Province Patentee before: Jiangsu Youkong New Energy Technology Co., Ltd. |