CN107493024B - A kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage - Google Patents
A kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage Download PDFInfo
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- CN107493024B CN107493024B CN201710889367.7A CN201710889367A CN107493024B CN 107493024 B CN107493024 B CN 107493024B CN 201710889367 A CN201710889367 A CN 201710889367A CN 107493024 B CN107493024 B CN 107493024B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
Abstract
The present invention discloses a kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage.The realization step of this method includes: in detection networking electric current because of negative-sequence current ingredient caused by three-phase power grid voltage is uneven, negative-sequence current is controlled using the internal model principle of PR resonant controller, the output of controller is with active pressure stabilizing instruction together as the instruction of current loop controller, electric current loop carries out closed loop to three pole reactor electric current, it is controlled using pi regulator, electric current loop output carries out SPWM and modulates to obtain driving pulse.The present invention is avoided the limitation of traditional continuous improvement electric current loop open-loop gain, can be better adapted to unbalanced power supply degree, had a good application prospect by the detection and control to networking electric current negative-sequence current, the superposition instruction of de-regulation negative phase-sequence.
Description
Technical field
The invention belongs to power electronics control fields, are related to a kind of control method of PWM rectifier, and especially one kind is used for
The control method of Three-Phase PWM Rectifier under unbalanced source voltage.
Background technique
With the development of economy, the increase of various electrical equipments, more stringent requirements are proposed to power grid by user, then accordingly
Power grid also to the power-supply device of user, more stringent requirements are proposed.Half control diode rectification before, it is gradually whole by PWM
Stream device is substituted, and the sineization of current on line side, unity power factor may be implemented in PWM rectifier, almost not any to power grid
Pollution.
Three-Phase PWM Rectifier is in the unbalanced situation of three-phase power grid voltage, it may appear that the case where various irregular operatings,
There is fluctuation (this is also the substantive reason that current distortion rate becomes larger) in three-phase current unbalance, busbar voltage.Certain high-power
Occasion, switching frequency is lower, bandwidth is not high, when imbalance of three-phase voltage also result in bus can not pressure stabilizing, the feelings of over-voltage occur
Condition occurs.
In recent years, in three-phase power grid voltage imbalance situation, stabilization, the high-performance of PWM rectifier are run many scholars
It is studied, proposes many methods.But many modes are summarized, all it is the angle in Automatic Control Theory, passes through
The control characteristic of electric current loop is improved to improve performance.However, the switching frequency of an equipment is limited after all, bandwidth is limited, especially
At the lower scene of high power switch frequency, almost without what effect.
Summary of the invention
The purpose of the present invention is overcome because of facility switching in the control process of the stabilization of PWM rectifier, high-performance operation
The limited bring adverse effect of frequency.The present invention has jumped out the thinking of conventional, propose it is a kind of it is not bandwidth limited, still may be used
To realize stable, high-performance operation method in the case of maximum three-phase power grid voltage degree of unbalancedness.
Solution of the invention is as follows:
This is used for the control method of Three-Phase PWM Rectifier under unbalanced source voltage, comprising:
It detects in networking electric current because of three-phase negative/positive electric current caused by three-phase power grid voltage is uneven；
Three-phase negative/positive electric current is controlled using the internal model principle of PR resonant controller；The output of PR resonant controller with
The active pressure stabilizing instruction superposition of three-phase is given as the instruction of electric current loop；
The electric current loop to three pole reactor electric current carry out closed loop, then pass through pi regulator, finally to electric current loop export into
Row SPWM modulates to obtain driving pulse, drives the work of inverter.
Based on above scheme, the present invention preferably implements process and optimization content is as follows:
The acquisition of the three-phase negative/positive electric current have passed through following procedure:
To three-phase networking current feedback, DQ axis information is obtained first with negative-phase sequence ABC/DQ coordinate system transformation, by low pass
Filtering obtains DC component, and negative-phase sequence DQ/ABC coordinate system transformation is recycled to obtain three-phase negative/positive current component.
The low-pass filtering is realized using moving average filter.
The PR resonant controller realizes that three-phase negative/positive electric current to 0 control, i.e., first does the three-phase negative/positive electric current with 0
Difference is then fed into PR resonant controller.
The acquisition of the active pressure stabilizing instruction of three-phase have passed through following procedure:
DC bus-bar voltage is detected, is made the difference with given busbar voltage, carries out no error following using pi regulator, and be superimposed one
Fixed voltage feed-forward control value, output are used as D axis component, and Q axis component is assigned a value of 0, carry out positive phase sequence DQ/ABC coordinate system
Transformation obtains the active pressure stabilizing instruction of three-phase.
For the difference expression of pi regulator:
U (k)=KP*e(k)+KI* e (k)+u (k-1), wherein KPTake 2.5；KITake 0.3.
In each control period, soft-lock phase is carried out to the phase angle of three-phase power grid voltage first, for instantaneous power transform and
Current transformer control.
The invention has the following advantages:
The present invention avoids biography by the detection and control to networking electric current negative-sequence current, the superposition instruction of de-regulation negative phase-sequence
System control thinking continuous improvement electric current loop open-loop gain (and because bandwidth limits, especially high-power, open-loop gain promotion has
Limit) limitation, unbalanced power supply degree can be better adapted to, can adapt to worst degree of unbalancedness, have well application
Prospect.
Detailed description of the invention
Fig. 1 is a kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage that the present invention is introduced
Main circuit topological structure schematic diagram.
Fig. 2 is a kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage that the present invention is introduced
Control block diagram.
Specific embodiment
The present invention is described in more detail with attached drawing With reference to embodiment:
It is as shown in Figure 1 PWM rectifier topological structure.3-phase power converter is three-phase voltage-type inverter, passes through three-phase electricity
Anti- to be attached with power grid, there are storage capacitors for DC bus, realize pressure stabilizing by the switch motion of current transformer, reach specific work
Rate factor and current sinusoidal.
As shown in Fig. 2, this is used for the control method of Three-Phase PWM Rectifier under unbalanced source voltage, step is implemented
It is as follows:
A. traditional soft-lock phase algorithm is utilized, locking phase is carried out to the phase angle of network voltage, for instantaneous power transform, is used for
Current transformer control.
B. DC bus-bar voltage is detected, is made the difference with given busbar voltage, carries out no error following using pi regulator, and be superimposed
Fixed voltage feed-forward control value, for inhibiting rush of current when starting.
The indifference control to direct current may be implemented in pi regulator；The difference expression of pi regulator is as follows:
U (k)=KP*e(k)+KI*e(k)+u(k-1)
Wherein KPIt is 2.5；KI=0.3；
For dc-link capacitance, too quick charge and discharge should not be carried out, so the response speed of busbar voltage ring needs
It reduces, generally the rank in several ms, operation starting PWM reorganizer will necessarily be brought to there are problems that dash current in this way,
So the present invention goes to solve the problems, such as dash current by the way of the fixed feedforward value of one network voltage of superposition.
Component of the output of c.b as D axis, Q axis component are assigned a value of 0, carry out the transformation of positive phase sequence DQ/ABC coordinate system, obtain
To three-phase active command Iap, Ibp, Icp.
Transformation for mula is as follows:
Wherein,
Wherein,
D. active to three-phase networking electric current progress negative phase-sequence, negative phase-sequence reactive current extraction.It is specific: first with negative-phase sequence ABC/
DQ coordinate system transformation obtains DQ axis information, is filtered using moving average filter, obtains DC component, recycles negative-phase sequence
DQ/ABC coordinate system transformation obtains three-phase negative/positive current component.
Transformation for mula such as c extracts negative phase-sequence composition, needs to be coordinately transformed according to negative phase-sequence angle.
The extraction of DC component is carried out using moving average filter, moving average filter has fast response time, nothing
The advantages of overshoot, difference expression are as follows:
Wherein N is sample frequency points corresponding with respect to fundamental wave, and x (i) is the instantaneous value of D axis or Q axis.
Information is controlled obtained by e.d, is made the difference with 0, is carried out the control of PR adjuster, is obtained output information.
PR resonator is based on internal model principle, and integral is exactly the internal model of direct current.PR adjuster can be well realized exchange at
The no error following of part.It is controlled here using PR resonator, the control of realization negative-sequence current to 0, the difference of PR adjuster
Expression formula is as follows；
Wherein: molecule: a0=0.00004893758；a1=0；a2=0.00004893758；
Denominator: b0=1；b1=-1.988495047；b2=0.988000433；
Information obtained by f.e and c gained information superposition are given as the instruction of g electric current loop.
Information obtained by g.f makes the difference with three pole reactor electric current, is controlled using pi regulator, obtains modulating wave.It is limited to
System bandwidth, single P adjuster, PR adjuster, pi regulator all cannot achieve the tracing control of complete indifference, in contrast PI tune
It saves device and other two is better than to the control effect of fundamental wave, therefore the present invention selects pi regulator.The difference expression of pi regulator
And parameter is as follows:
U (k)=KP*e(k)+KI*e(k)+u(k-1)
Wherein KPIt is 0.015；KI=0.0004；
Gained modulating wave obtains PWM driving pulse using SPWM modulation system, drives the work of inverter.Realize pressure stabilizing,
Unity power factor, current sinusoidal.
New approaches mentioned by the present invention can substantially improve PWM change in the way of control adjust automatically negative phase-sequence instruction
Device is flowed to the adaptability of unbalanced power grid.With very big application prospect.
Claims (5)
1. a kind of control method for Three-Phase PWM Rectifier under unbalanced source voltage characterized by comprising
It detects in networking electric current because of three-phase negative/positive electric current caused by three-phase power grid voltage is uneven；Three-phase negative/positive electric current is done with 0
Difference is then fed into PR resonant controller；
The output of PR resonant controller is superimposed given as the instruction of three pole reactor current regulator with the active pressure stabilizing instruction of three-phase；
The acquisition of the active pressure stabilizing instruction of three-phase have passed through following procedure: detection DC bus-bar voltage makes the difference with given busbar voltage,
No error following is carried out using pi regulator, and is superimposed a fixed voltage feed-forward control value, output is used as D axis component, Q axis component
It is assigned a value of 0, carries out the transformation of positive phase sequence DQ/ABC coordinate system, obtains the active pressure stabilizing instruction of three-phase；
Three pole reactor current regulator carries out closed loop to three pole reactor electric current, then passes through pi regulator, finally to three pole reactor
Current regulator output carries out SPWM and modulates to obtain driving pulse, drives the work of Three-Phase PWM Rectifier.
2. the control method according to claim 1 for Three-Phase PWM Rectifier under unbalanced source voltage, feature exist
In the acquisition of the three-phase negative/positive electric current have passed through following procedure:
To networking current feedback, DQ axis information is obtained first with negative-phase sequence ABC/DQ coordinate system transformation, by low-pass filtering, is obtained
DC component recycles negative-phase sequence DQ/ABC coordinate system transformation to obtain three-phase negative/positive current component.
3. the control method according to claim 2 for Three-Phase PWM Rectifier under unbalanced source voltage, feature exist
In: the low-pass filtering is realized using moving average filter.
4. the control method according to claim 1 for Three-Phase PWM Rectifier under unbalanced source voltage, feature exist
In for the difference expression of pi regulator:
U (k)=KP*e(k)+KI* e (k)+u (k-1), wherein KPTake 2.5；KITake 0.3.
5. the control method according to claim 1 for Three-Phase PWM Rectifier under unbalanced source voltage, feature exist
In: in each control period, soft-lock phase is carried out to the phase angle of three-phase power grid voltage first, is used for instantaneous power transform and current transformer
Control.
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| CN101493482A (en) * | 2008-07-11 | 2009-07-29 | 深圳市盛弘电气有限公司 | Single-phase harmonic current detecting method |
| CN101667787A (en) * | 2009-09-30 | 2010-03-10 | 大连光洋科技工程有限公司 | Voltage oriented energy bidirectional flowing rectifier control device |
| CN103199543A (en) * | 2013-03-25 | 2013-07-10 | 湖南大学 | Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation |
| CN107069809A (en) * | 2017-04-10 | 2017-08-18 | 湘潭电机股份有限公司 | A kind of directly driven wind-powered current transformer high voltage crossing control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493482A (en) * | 2008-07-11 | 2009-07-29 | 深圳市盛弘电气有限公司 | Single-phase harmonic current detecting method |
| CN101667787A (en) * | 2009-09-30 | 2010-03-10 | 大连光洋科技工程有限公司 | Voltage oriented energy bidirectional flowing rectifier control device |
| CN103199543A (en) * | 2013-03-25 | 2013-07-10 | 湖南大学 | Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation |
| CN107069809A (en) * | 2017-04-10 | 2017-08-18 | 湘潭电机股份有限公司 | A kind of directly driven wind-powered current transformer high voltage crossing control method |
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Address after: 710304 Shaanxi Xi'an high tech Zone Qinling Mountains Avenue West 6 science and technology enterprise accelerator two area 15 Applicant after: Xi'an Yi Fei nuclear power equipment Limited by Share Ltd Address before: 710304 Shaanxi city of Xi'an province high tech Zone two zone 15 cottage business accelerator Applicant before: Xi'an Thorpe Electric Technology Co., Ltd. |
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Effective date of registration: 20191210 Address after: 710304 2 / F, building 15, zone 2, National Science and technology enterprise accelerator, No. 6, Qinling Avenue West, hi tech Zone, Xi'an City, Shaanxi Province Patentee after: Xi'an Fermi artificial intelligence Co., Ltd Address before: 710304 Shaanxi Xi'an high tech Zone Qinling Mountains Avenue West 6 science and technology enterprise accelerator two area 15 Patentee before: Xi'an Yi Fei nuclear power equipment Limited by Share Ltd |
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