CN110266244A - A kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance - Google Patents
A kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance Download PDFInfo
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- CN110266244A CN110266244A CN201910552471.6A CN201910552471A CN110266244A CN 110266244 A CN110266244 A CN 110266244A CN 201910552471 A CN201910552471 A CN 201910552471A CN 110266244 A CN110266244 A CN 110266244A
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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
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance, comprising the following steps: the transient state component of S1, sample motor stator current；S2, the oscillating component that stator current is calculated according to the transient state component of stator current；S3, the command voltage and instruction frequency that frequency converter is calculated according to oscillating component and virtual impedance；S4, according to the output voltage and output frequency of command voltage and instruction frequency dynamic regulation frequency converter, to inhibit current fluctuation.The oscillating component that the technical program passes through acquisition stator current, it is controlled in conjunction with virtual impedance, it calculates suitable oscillation and inhibits component, and it is used for frequency converter output voltage frequency and amplitude adjusting, current fluctuation can effectively be inhibited, it prevents motor from generating torque pulsation, improves the stability and runnability of system.
Description
Technical field
The present invention relates to variable-frequency control technique fields, are specifically related to a kind of cascade connection type frequency converter vibration based on virtual impedance
Swing suppressing method.
Background technique
Energy-saving and emission-reduction are that current high energy consumption industry has to consider the problems of, a large amount of high energy consumption enterprise urgent need section
The transformation of energy emission reduction.And the Frequency Conversion Modification of high-voltage motor just becomes a main trend.The blower fan water pump of low capacity (2000kW or less)
Frequency Conversion Modification gradually completes.When with Frequency Conversion Modification large capacity blower, there is motor fan vibration, shafting is impaired due to torsional oscillation
The case where being even broken, and it was found that the output electric current of frequency converter has fluctuation.
When the work of cascade connection type transducer drive asynchronous machine is under V/F mode, system is relatively subject to persistent oscillation problem, should
Problem is especially prominent under underloading and low frequency condition.Early stage thinks that frequency converter electric system and load machinery part are shaken
It swings, avoids vibrating generally by frequency converter frequency modulation.Or compensation portion voltage, this method suppression are exported to frequency conversion when oscillation
Current fluctuation processed it is ineffective, only improve the stability characteristic (quality) when running frequency of part.
Summary of the invention
To solve the above-mentioned problems, it is good based on virtual resistance that the object of the present invention is to provide a kind of inhibition current fluctuation effects
Anti- cascade connection type frequency converter oscillation suppression method.
The technical solution adopted by the present invention is that:
A kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance, comprising the following steps:
The transient state component of S1, sample motor stator current；
S2, the oscillating component that stator current is calculated according to the transient state component of stator current；
S3, the command voltage that frequency converter is calculated according to the oscillating component and virtual impedance of stator current and instruction frequency
Rate；
S4, according to the output voltage and output frequency of command voltage and instruction frequency dynamic regulation frequency converter, to inhibit electricity
Stream fluctuation.
Further, the calculation method of oscillating component is in the step S2
Motor stator three-phase current is transformed on synchronous rotating frame dq by coordinate transform formula, is calculatedThen basisCalculate motor reactive current component id、, active current iq, then pass through the idle electricity of motor
Flow component id、, active current iqCalculate oscillating component idflt、iqflt。
Further, the coordinate transform formula is
Wherein iAFor A phase current, iBFor B phase current.
Further, the reactive current component id、With active current iqCalculation formula be
WhereinFor system oriented angle.
Further, the oscillating component idflt、iqfltCalculation formula be
Wherein s is differential operator, ωc1、ωc2Respectively filter cutoff frequency, Δ idFor the oscillating component of reactive current,
ΔiqFor the oscillating component of watt current.
Further, the output voltage of frequency converter and output frequency calculation formula are in the step S3
Fcmd=Fref-k1*iqflt=Fref-Z1*Δiq
Ucmd=Uref-K2*idflt=Uref-Z2*Δid
Wherein Z1, Z2 are the active circuit of motor and the virtual impedance in idle circuit, FrefFor reference frequency, UrefFor reference
Voltage, FcmdFor instruction frequency, UcmdFor command voltage.
The beneficial effects of the present invention are:
The technical program calculates suitable vibration in conjunction with virtual impedance control by obtaining the oscillating component of stator current
Inhibition component is swung, and is used for frequency converter output voltage frequency and amplitude adjusting, can effectively inhibit current fluctuation, prevent electricity
Machine generates torque pulsation, improves the stability and runnability of system.
Detailed description of the invention
Fig. 1 is the step flow chart of cascade connection type frequency converter oscillation suppression method of the present invention；
Fig. 2 is the system control block figure of cascade connection type frequency converter；
Fig. 3 a is the experimental waveform figure implemented before this method；
Fig. 3 b is the experimental waveform figure implemented after this method.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
It is as shown in Figure 1 a kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance of the invention, including with
Lower step:
The transient state component of S1, sample motor stator current；
S2, the oscillating component that stator current is calculated according to the transient state component of stator current, calculation method are to pass through coordinate
Transformation for mula transforms to motor stator three-phase current on synchronous rotating frame dq, because motor three-phase current meets iA+iB+iC
=0, to reduce system cost, system only samples two-way electric current iA、iB, CLARK coordinate transform formula is simplified, control is reduced
Calculation amount processed, coordinate transform formula are as follows:
Wherein iAFor A phase current, iBFor B phase current；
Then basisCalculate motor reactive current component id、, active current iq, calculation formula are as follows:
WhereinFor system oriented angle, D axis is oriented on motor A phase position by motor control algorithms,It is fixed for system
To angle, the synchronization angle as applied to motor, the angle is integrated to obtain by hair wave frequency rate；
Motor reactive current component id、, active current iqIt may separate out oscillating component i by low-pass filterdflt、
iqflt, the domain S expression formula is as follows:
Wherein s is differential operator, ωc1、ωc2Respectively filter cutoff frequency, Δ idFor the oscillating component of reactive current,
ΔiqFor the oscillating component of watt current.
S3, the command voltage and instruction frequency that frequency converter is calculated according to oscillating component and virtual impedance, calculation formula
For
Fcmd=Fref-k1*iqflt=Fref-Z1*Δiq,
Ucmd=Uref-K2*idflt=Uref-Z2*Δid,
Wherein Z1, Z2 are the active circuit of motor and the virtual impedance in idle circuit, FrefFor reference frequency, UrefFor reference
Voltage, FcmdFor instruction frequency, UcmdFor command voltage.
S4, according to the output voltage and output frequency of command voltage and instruction frequency dynamic regulation frequency converter, to inhibit electricity
Stream fluctuation.
It is illustrated in figure 2 the system control block figure of cascade connection type frequency converter, phase-shifting transformer, unit module, master control system
It constitutes, master control system is responsible for control logic, relay protective scheme, communication strategy and the control algolithm of whole system, and control instruction is logical
It crosses optical fiber and is issued to each unit module, carry out cascaded-output, dragging motor loads smoothness run.
When the driving asynchronous machine of cascade connection type frequency converter is worked under V/F mode, frequency conversion system is in underloading or unloaded feelings
Oscillation is easy to happen under condition.When vibrating in system, the active power and reactive power of motor will also vibrate.Stator
Active and reactive power oscillation almost all is reflected in the active and reactive component of stator current.Based on virtual impedance, have
Function and reactive power can be adjusted by frequency to frequency converter output voltage and amplitude respectively, so as to inhibit current wave
It is dynamic.Stable frequency and voltage, this control are obtained by the control of P/f virtual impedance and the control of Q/V virtual impedance respectively
Method is respectively controlled to the active power and reactive power of frequency converter output, reaches and torque ripple is inhibited to obtain purpose.
In conclusion the present invention will be according to system impedance dynamic adjustment output voltage, frequency come systems stabilisation.Using being based on
The control method of virtual impedance only used and directly vibrate relevant stator current transient state component, passes through motor stator electric current
Detection sampling is simple and easy to obtain its transient state component.
Output can be adjusted in the present invention according to system impedance, while adjusting frequency and voltage, practical.Pass through filter
Wave device extracts stator current oscillating component, is finely adjusted according to amplitude and frequency of the system impedance to frequency converter output voltage, can
Effectively to inhibit current fluctuation, prevents motor from generating torque pulsation, improve the stability and runnability of system.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (6)
1. a kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance, which comprises the following steps:
The transient state component of S1, sample motor stator current；
S2, the oscillating component that stator current is calculated according to the transient state component of stator current；
S3, the command voltage and instruction frequency that frequency converter is calculated according to the oscillating component and virtual impedance of stator current；
S4, according to the output voltage and output frequency of command voltage and instruction frequency dynamic regulation frequency converter, to inhibit current wave
It is dynamic.
2. cascade connection type frequency converter oscillation suppression method according to claim 1, it is characterised in that: vibrated in the step S2
The calculation method of component is
Motor stator three-phase current is transformed on synchronous rotating frame dq by coordinate transform formula, is calculatedSo
Basis afterwardsCalculate motor reactive current component id、, active current iq, then pass through motor reactive current component
id、, active current iqCalculate oscillating component idflt、iqflt。
3. cascade connection type frequency converter oscillation suppression method according to claim 2, it is characterised in that: the coordinate transform formula
For
Wherein iAFor A phase current, iBFor B phase current.
4. cascade connection type frequency converter oscillation suppression method according to claim 2, it is characterised in that: the reactive current component
id、With active current iqCalculation formula be
WhereinFor system oriented angle.
5. cascade connection type frequency converter oscillation suppression method according to claim 2, it is characterised in that: the oscillating component idflt、
iqfltCalculation formula be
Wherein s is differential operator, ωc1、ωc2Respectively filter cutoff frequency, Δ idFor the oscillating component of reactive current, Δ iq
For the oscillating component of watt current.
6. cascade connection type frequency converter oscillation suppression method according to claim 1, it is characterised in that: frequency conversion in the step S3
The output voltage and output frequency calculation formula of device be
Fcmd=Fref-k1*iqflt=Fref-Z1*Δiq
Ucmd=Uref-K2*idflt=Uref-Z2*Δid
Wherein Z1, Z2 are the active circuit of motor and the virtual impedance in idle circuit, FrefFor reference frequency, UrefFor with reference to electricity
Pressure, FcmdFor instruction frequency, UcmdFor command voltage.
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Citations (6)
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| US5309075A (en) * | 1990-03-23 | 1994-05-03 | Toyoda Koki Kabushiki Kaisha | Digital servo-control apparatus for preventing torque variations |
| CN1417937A (en) * | 2002-11-09 | 2003-05-14 | 艾默生网络能源有限公司 | Frequency converter control method and device capable of inhibiting open-loop system oscillation |
| CN101662255A (en) * | 2009-09-27 | 2010-03-03 | 北京东标电子有限公司 | Method of restraining current oscillation of scalar frequency converter |
| CN102647142A (en) * | 2011-12-26 | 2012-08-22 | 东方日立(成都)电控设备有限公司 | Current vibration suppression control system of high voltage inverter |
| CN106208860A (en) * | 2016-07-26 | 2016-12-07 | 五邑大学 | The suppressing method of asynchronous machine V/F speed governing underloading vibration and V/F governing system |
| CN107994825A (en) * | 2017-12-27 | 2018-05-04 | 深圳市英威腾电气股份有限公司 | A kind of oscillation suppression method, system, device and readable storage medium storing program for executing |
-
2019
- 2019-06-25 CN CN201910552471.6A patent/CN110266244A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5309075A (en) * | 1990-03-23 | 1994-05-03 | Toyoda Koki Kabushiki Kaisha | Digital servo-control apparatus for preventing torque variations |
| CN1417937A (en) * | 2002-11-09 | 2003-05-14 | 艾默生网络能源有限公司 | Frequency converter control method and device capable of inhibiting open-loop system oscillation |
| CN101662255A (en) * | 2009-09-27 | 2010-03-03 | 北京东标电子有限公司 | Method of restraining current oscillation of scalar frequency converter |
| CN102647142A (en) * | 2011-12-26 | 2012-08-22 | 东方日立(成都)电控设备有限公司 | Current vibration suppression control system of high voltage inverter |
| CN106208860A (en) * | 2016-07-26 | 2016-12-07 | 五邑大学 | The suppressing method of asynchronous machine V/F speed governing underloading vibration and V/F governing system |
| CN107994825A (en) * | 2017-12-27 | 2018-05-04 | 深圳市英威腾电气股份有限公司 | A kind of oscillation suppression method, system, device and readable storage medium storing program for executing |
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| 孙东 等: "一种改进的异步电机VVVF系统稳定性改善方法", 《电力电子技术》 * |
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Application publication date: 20190920 |