CN106655736A - Inverter power supply current limiting control method of variable controller parameters - Google Patents
Inverter power supply current limiting control method of variable controller parameters Download PDFInfo
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- CN106655736A CN106655736A CN201710042984.3A CN201710042984A CN106655736A CN 106655736 A CN106655736 A CN 106655736A CN 201710042984 A CN201710042984 A CN 201710042984A CN 106655736 A CN106655736 A CN 106655736A
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- China
- Prior art keywords
- inverter
- output voltage
- control method
- current
- power supply
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an inverter power supply current limiting control method of variable controller parameters. The treatment of the following steps is carried out circularly: (1) judging whether a load current effective value of an inverter power supply is greater than 3 times of rated load current, and if so, executing step (2); otherwise, executing step (3); (2) judging whether an output voltage effective value of the inverter power supply is smaller than a rated output voltage, and if so, executing step (4); otherwise, executing step (3); (3) setting an attenuation factor kc of the controller parameters as 1, and executing step (5); (4) correcting the attenuation factor kc of the controller parameters, and executing step (5); (5) filtering the attenuation factor kc by using a low pass filter; and according to the method disclosed by the invention, on the basis of the existing double-loop control method, the problems of poor quality of output waveforms under the working conditions of short circuit faults and switch in or switch out short circuit working conditions of the inverter power supply in the prior art can solved just by changing the controller parameters.
Description
Technical field
The invention belongs to inverter technical field, more particularly, to a kind of inverter limit of change controller parameter
Method of flow control.
Background technology
For inverter, (such as short trouble) reliable and secure can run and can guarantee that good under complex working condition
Good output waveform quality is particularly important, takes into account inverter reliability and the quality of power supply is significant.
Prior art, frequently with Double-loop Control Strategy, is restriction when system is operated under short trouble for inverter
Inductive current increases, and by clipping mode inductive current command value size is constrained.But after the method current limliting, due to output electricity
Force down in set-point, and outer ring controller has larger gain at fundamental wave, the waveform of outer ring controller output is a width
Value is far longer than amplitude limit value and obtains inductive current instruction, and what is obtained after amplitude limit is a sine wave for cutting top, containing substantial amounts of harmonic wave
So as to cause output waveform poor quality, in addition to it may have undesirable effect to load, a large amount of harmonic waves also can by transformer
Make its send it is ear-piercing make an uproar, aggravation of generating heat, even can damage transformer when serious.
Prior art separately has by Voltage loop and electric current loop switching mode, i.e., when there is short trouble, switch to electric current
Ring works, safeguards system energy trouble free service, but the instruction mutation brought in handoff procedure can cause system output waveform to vibrate,
Especially impact or it is prominent unload to short trouble when dynamic property it is not good.Prior art separately has software and hardware combining mode, first uses
Hardware realizing that quickly weakening inductive current uprushes, and then ensures that system is normally run using double -loop control mode, this mode
Although safe and reliable, however it is necessary that increasing extra hardware cost.
For to sum up, when short trouble occurs in inverter, inner ring is instructed after amplitude limit prior art, there is output
Waveform quality is poor, and a large amount of harmonic wave by transformer cause its send it is ear-piercing make an uproar, aggravation of generate heat, when serious or even damage transformation
The problems such as device.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of inversion electricity for becoming controller parameter
Source Current limited Control method, its object is to solve prior art in inverter in short trouble, cut or cut out Short-circuit Working Condition
Lower output waveform problem of poor quality.
For achieving the above object, according to one aspect of the present invention, there is provided a kind of inverter of change controller parameter
Current limited Control method, the process of following steps is carried out according to sampling period or controlling cycle time：
(1) whether the load current virtual value for judging inverter is more than 3 times of nominal load current, if so, then enters
Step (2)；If it is not, then entering step (3)；
(2) judge that the output voltage virtual value of inverter, whether less than rated output voltage, if so, then enters step
(4), if it is not, then entering step (3)；
(3) by decay factor k of controller parameterc1 is set to, into step (5)；
(4) decay factor k of modifier controller parameterc, into step (5)；
(5) using low pass filter to decay factor kcIt is filtered process.
Preferably, above-mentioned inverter Current limited Control method, its nominal load current is under inverter nominal situation
Output current virtual value, is determined by power system capacity and rated output voltage.
Preferably, above-mentioned inverter Current limited Control method, its rated output voltage is under inverter nominal situation
Output voltage virtual value.
Preferably, above-mentioned inverter Current limited Control method, decay factor k of the controller parameter of step (4)c=
3ILRMS/[A·(uref-UORMS)]；
Wherein, A for inverter yield value of the controller at fundamental frequency, urefFor inverter output voltage ginseng
Examine command voltage, UORMSFor inverter output voltage virtual value, ILRMSFor inverter inductance ratings electric current.
Preferably, above-mentioned inverter Current limited Control method, the expression formula of the low pass filter for adopting for 1/ (τ s+1),
Wherein τ is filter temporal constant, and s is Laplace operator.
In general, by the contemplated above technical scheme of the present invention compared with prior art, can obtain down and show
Beneficial effect：
(1) the inverter Current limited Control method of the change controller parameter that the present invention is provided, in existing double loop control
On the basis of, only need to change outer ring controller parameter in intrinsic control structure, increase hardware without the need for extra it is ensured that
System safety operation, reduces cost and realizes simple；
(2) the inverter Current limited Control method of the change controller parameter that the present invention is provided, outer ring controller parameter can be real
When adjust, after parameter adjustment using low pass filter relaxed by filtering controller parameter mutation caused by modulation wave number
Sharply increase, with the dynamic property of the inverter during ensureing failure incision or cutting out；
(3) the inverter Current limited Control method of the change controller parameter that the present invention is provided, when inverter is operated in normally
During operating mode, outer ring controller parameter keeps constant, therefore ensure that the stable state and dynamic property possessed under nominal situation.
Description of the drawings
Fig. 1 is the schematic flow sheet of the inverter Current limited Control side of the change controller parameter that embodiment is provided；
Fig. 2 is the double -loop control schematic diagram of inverter in embodiment；
Fig. 3 is the waveform diagram of load current and output voltage when inverter short trouble is cut in embodiment；
Fig. 4 is the waveform diagram of load current and output voltage when inverter short trouble cuts out in embodiment.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each embodiment
Not constituting conflict each other just can be mutually combined.
A kind of deficiency of the present invention for existing inverter Double-loop Control Technology, it is proposed that inversion of change controller parameter
Power supply Current limited Control method, can reduce inductive current command value harmonic content cutting or cutting out when short trouble occurs, so as to
When inverter occurs incision or cuts out failure, the sine degree of output voltage is higher.
For the further description present invention, a kind of inversion electricity of the change controller parameter for providing with reference to embodiments
Source current-limiting method and accompanying drawing be specifically described it is as follows, embodiment provide inverter current-limiting method, its flow process as shown in figure 1,
Comprise the steps：
(1)：The load current of detection inverter, judges whether load current virtual value is more than 3 times of nominal load electricity
Stream, if so, then enters step (2)；If it is not, then entering step (3)；Nominal load current therein is according to power system capacity and specified
Output voltage determines；
(2) judge that the output voltage virtual value of inverter, whether less than rated output voltage, if so, then enters step
(4), if it is not, then entering step (3)；
(3) by decay factor k of controller parameterc1 is set to, into step (5)；
(4) decay factor k of modifier controller parameterc, make kc=3ILRMS/[A·(uref-UORMS)], into step (5)；
Wherein, A for inverter yield value of the controller 1 at fundamental frequency, urefFor output voltage reference instruction electricity
Pressure, UORMSFor output voltage virtual value, ILRMSFor inductance ratings electric current；
(5) adopt expression formula for 1/ (τ s+1) low pass filter to decay factor kcIt is filtered process；Wherein τ is filter
Ripple device time constant, s is Laplace operator；In embodiment, τ selects to be cut less than or equal to the LC mode filters of inverter
The only inverse of frequency.
It is the double -loop control schematic diagram of the inverter in embodiment shown in Fig. 2, the double -loop control structure includes subtracter
1st, subtracter 2, controller 1, controller 2, amplifier 1 and amplifier 2；1st input of subtracter 1 is output voltage instruction
Value, the 2nd input of subtracter 1 is LC mode filter output voltages；The input of controller 1 is connected to the output of subtracter 1
End, the output end of controller 1 is the input of amplifier 1；The output end of amplifier 1 for subtracter 2 first input end, subtraction
2nd input of device 2 is the inductive current of LC wave filters；The input of controller 2 is connected to the output end of subtracter 2, control
The output end of device 2 connects the input of amplifier 2, the output end connection LC mode filter inputs of amplifier 2；
Double loop control the realizing in above-mentioned twin nuclei of the change controller parameter that embodiment is provided is specific as follows：
Controller 1 be ratio first-harmonic resonance+harmonic resonance controller, for suppressing nominal situation under low-order harmonic voltage；Controller 2
For ratio first-harmonic resonance controller, for tracking the control of inverter side inductive current, and amplitude limit is carried out to the output valve of controller 1；
In the control structure, the ratio first-harmonic resonance control parameter that it is critical only that controller 1 is multiplied by institute after the decay factor of amplifier 2
The outer ring controller for obtaining is variable, and the selection of decay factor is then the flow process of the method that provided according to embodiment according to Fig. 1
Figure judges value.
In order to more clearly illustrate embodiment, illustrate here in conjunction with instantiation；In example, three phase inverter volume
Power is determined for 10kVA, rated output voltage is 115V, then single-phase power 3.3kVA, output-current rating is 29A, inductive current
Virtual value is 22.7A；Design objective is limited and flow to 3 times of load currents, and virtual value is 87A, therefore the virtual value can be used as step
(1) threshold current of short circuit is judged；Under short trouble, actual output voltage can be reduced, and Standard is voltage under failure
110V is not less than, therefore in this example, the threshold voltage threshold value of step (2) sets 110V；Step (4) modifier controller parameter
Decay factor, makes kc=3ILRMS/[A·(uref-UORMS)]；In this example, ILRMS=22.7A, uref=115V, UORMSFor sampling
The virtual value of output voltage, A be fundamental wave yield value can according to the open loop Bode figures under actual nominal situation in 50Hz decibel values, one
As be designed as 40dB and can ensure without steady-state error, in this example value is 34dB；According to 20lg (A)=34dB, increasing is solved
Beneficial value A=50；
Thus, the decay factor of controller parameter is modified to into k in step (4)c=1.3/ (115-UORMS)；Consider actual
Division calculation meeting temporary calculates in a large number the time in DSP Digital Implementations, can be to decay factor k of step (4)cLinearized, can
Implement with reference to correlation curve approximating method.
In the filter step of step (5), wave filter delay time determines according to LC filter resonance frequencies, embodiment
In, frequency filtering is then set to f=1345Hz by filter inductance L=280uH, filter capacitor C=50uF；
In the present embodiment, it is contemplated that wave filter does not interfere with real system bandwidth, therefore value is slightly larger than or equal to LC filters
Ripple device cut-off frequency, can approximate calculation obtain τ ≈ 7 × 10-4, filter expression is thus obtained for 1/ (7 × 10-4·s+1)。
Fig. 3 and Fig. 4 sets forth the inverter Current limited Control side of the change controller parameter provided using the present embodiment
After method, output waveform when inverter short circuit is cut, cuts out, wherein, Fig. 3 (a) is that inverter short circuit incision failure occurs
When output voltage waveform diagram, Fig. 3 (b) be inverter short circuit incision failure occur when load current waveform illustrate
Figure；Wherein, Fig. 4 (a) is the waveform diagram that inverter short circuit cuts out output voltage when failure occurs, and Fig. 4 (b) is inversion electricity
Source short circuit cuts out the waveform diagram of load current when failure occurs；Output voltage and load current in whole process can be seen
Without substantially overshoot, show that system can stablize safe and reliable operation；On the other hand, by cut or cut out regulating time come
See, whole process, less than the 30ms of Standard, shows that dynamic property is ensured in 15ms or so；May be used also from the two figures
To see whole output voltage and load current waveform, Waveform sine is good, show embodiment method ensure that it is good defeated
Go out waveform quality.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (5)
1. it is a kind of become controller parameter inverter Current limited Control method, it is characterised in that comprise the steps：
(1) whether the load current virtual value for judging inverter is more than 3 times of nominal load current, if so, then enters step
(2)；If it is not, then entering step (3)；
(2) judge that the output voltage virtual value of inverter, whether less than rated output voltage, if so, then enters step (4), if
It is no, then into step (3)；
(3) by decay factor k of controller parameterc1 is set to, into step (5)；
(4) decay factor k of modifier controller parameterc, into step (5)；
(5) using low pass filter to decay factor kcIt is filtered process.
2. inverter Current limited Control method as claimed in claim 1, it is characterised in that the nominal load current is inversion
Output current virtual value under power supply nominal situation.
3. inverter Current limited Control method as claimed in claim 1 or 2, it is characterised in that the rated output voltage is
Output voltage virtual value under inverter nominal situation.
4. inverter Current limited Control method as claimed in claim 1 or 2, it is characterised in that the controller of the step (4)
Decay factor k of parameterc=3ILRMS/[A·(uref-UORMS)]；
Wherein, A for inverter yield value of the controller at fundamental frequency, urefRefer to for the reference of inverter output voltage
Make voltage, UORMSFor inverter output voltage virtual value, ILRMSFor inverter inductance ratings electric current.
5. inverter Current limited Control method as claimed in claim 1 or 2, it is characterised in that the low pass that step (5) is adopted
The expression formula of wave filter is 1/ (τ s+1), and wherein τ is filter temporal constant, and s is Laplace operator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710042984.3A CN106655736A (en) | 2017-01-19 | 2017-01-19 | Inverter power supply current limiting control method of variable controller parameters |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710042984.3A CN106655736A (en) | 2017-01-19 | 2017-01-19 | Inverter power supply current limiting control method of variable controller parameters |
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| CN106655736A true CN106655736A (en) | 2017-05-10 |
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| CN201710042984.3A Pending CN106655736A (en) | 2017-01-19 | 2017-01-19 | Inverter power supply current limiting control method of variable controller parameters |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557174A (en) * | 2009-04-22 | 2009-10-14 | 华中科技大学 | A state-tracked digitally-controlled inverter power supply |
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2017
- 2017-01-19 CN CN201710042984.3A patent/CN106655736A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557174A (en) * | 2009-04-22 | 2009-10-14 | 华中科技大学 | A state-tracked digitally-controlled inverter power supply |
Non-Patent Citations (1)
| Title |
|---|
| 田伟: "400Hz逆变电源波形控制及限流技术", 《万方数据知识服务平台》 * |
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Application publication date: 20170510 |