CN109617434A - A kind of mixing control method of Three-Phase PWM Rectifier - Google Patents
A kind of mixing control method of Three-Phase PWM Rectifier Download PDFInfo
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- CN109617434A CN109617434A CN201811573090.8A CN201811573090A CN109617434A CN 109617434 A CN109617434 A CN 109617434A CN 201811573090 A CN201811573090 A CN 201811573090A CN 109617434 A CN109617434 A CN 109617434A
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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
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Abstract
The invention discloses a kind of mixing control methods of Three-Phase PWM Rectifier, in conjunction with rectifier hysteretic loop current control and rectifier transient current testing, it is fixed using PWM rectifier transient control High Power Factor, frequency, the advantages of steady-state DC voltage is stable and Hysteresis control fast response time, and propose the problem of a kind of load sudden change identifies the method for judgement, and effective solution system voluntarily identifies load sudden change；Compared with traditional hysteretic loop current control, rectifier switching device in stable operation is run under fixed frequency, is reduced the loss to switching device, is improved the reliability of rectifier.Compared with traditional transient current testing, DC voltage energy faster response when loading or exchange side voltage change causes DC voltage to fluctuate is improved, so that DC voltage fluctuation range is smaller, the time is shorter.
Description
Technical field
The invention belongs to power electronics and power drives technical field more particularly to a kind of mixing of Three-Phase PWM Rectifier
Control method is that control is mixed with transient current using hysteresis current.
Background technique
About the control method of rectifier, nowadays has many documents and it is studied and has been discussed, it is many among these
Classic control method has obtained practical application, also there are many Optimal improvements control method by it has been proposed that.Currently, pulse width
The modulation common control technology of (PWM) rectifier has transient current to directly control technology, prediction the Direct Current Control, d-q
Active and reactive current control technology of coordinate system etc., every kind of control have its advantage, wherein transient state Direct Current Control skill
Art is widely used in rectifier control, and transient state Direct Current Control has circuit harmonizing wave small, and DC voltage ripple is small, opens
Close the advantages that frequency is fixed；And relative to transient state Direct Current Control, hysteretic loop current control is because its current harmonics is big, switching frequency
Being not fixed causes disadvantage big to switch device loss etc. extensive using no transient state Direct Current Control, but hysteretic loop current control
It is easy to accomplish with fast dynamic response ability, the simple advantage of structure.
The shortcomings that prior art:
1. control algolithm is single
Existing rectifier control algolithm is relatively simple, respectively there is its advantage and disadvantage, such as the active and idle electricity of d-q coordinate system
Flow control power factor (PF) is high, and harmonic wave is small, but response speed is comparatively relatively slow, hysteretic loop current control fast response time, but due to
Its switching frequency is not fixed, and causes side harmonics larger, and also bigger to the loss of switching device, in short, existing rectification
Device control respectively has its advantage and disadvantage；
2. not accounting for the algorithm adaptability under different working conditions
In general, controlled rectifier DC side load behavior is always changeable, there is different operations under different operating conditions
Condition will lead to DC voltage and also generate mutation, the power switching under operating conditions different so is also examined in load switching mutation
The performance of rectifier is tested, and existing Rectifier often has it just for the operation under not one or more operating conditions
Advantage, and the control disadvantage of rectifier will withdraw deposit out when operating condition variation, at this time if can have a kind of mixing various control
The rectifier mixing control of method can switch the performance that different control will greatly improve rectifier in different operating conditions.
The specific control target of DC voltage is as follows: 1. rectifier controller while operation transient current testing and stagnant ring
Two kinds of algorithms of current control；2. whether accurate judgement DC voltage is in stability range, if not opened using hysteretic loop current control
OFF signal, if if use transient current testing signal.
Summary of the invention
The present invention proposes a kind of mixing control method of Three-Phase PWM Rectifier, is that solving Three-Phase PWM Rectifier operates in
When different operating conditions rectifier it is how more intelligent the problem of taking control method, make full use of rectifier transient current testing and
The advantages of hysteretic loop current control, and a kind of algorithm of simple and practical DC voltage mutation judgement is devised, so that rectifier
The control algolithm that suitable current working is taken in different operating conditions improves the performance of rectifier.
Specifically, the present invention solves above-mentioned technical problem using following technical scheme: a kind of Three-Phase PWM Rectifier is mixed
Combination control method, comprising the following steps:
Step 1, rectifier carry out the operation of transient current testing and hysteretic loop current control in controller simultaneously at runtime,
Obtain the switch control signal under two kinds of algorithms；
Step 2 judges whether DC voltage is in stable range, if so, going to step 3；If it is not, going to step
4；
Step 3, output switch control signal are that transient current testing signal then remains unchanged, if output switch control signal
Transient current testing signal is then switched to for hysteretic loop current control signal；
Step 4 remains unchanged if hybrid algo-rithm output switch control signal is hysteretic loop current control signal, if defeated
Switch control signal is that transient current testing signal is then switched to hysteretic loop current control signal out.
Specifically, a kind of mixing control method of Three-Phase PWM Rectifier and each mode meaning are as follows in above step:
In step 1, when the feedback quantity of described two algorithms is the same, it can be carried out in the controller of a rectifier simultaneously
Operation；
A kind of simple and effective judgement algorithm has been used in step 2, judges that DC voltage, can be with whether in stability range
The difference of the range according to locating for voltage selects corresponding control method, so that rectifier performance is optimized；
DC voltage actual value need to thus be avoided that practical straight by being compared after low-pass filtering with reference voltage value
Stream side voltage there is when fluctuation causes voltage be in critical judgement point due to voltage fluctuation make control signal switching frequency mistake
Height leads to spread of voltage；DC voltage actual value is set as Ud, reference voltage minimum Umin, reference voltage maximum value
For Umax, then have:
Work as Umin≤Ud< UmaxWhen, illustrate that DC voltage is in stability range.At this moment controller is answered to select transient current
Control, so that DC voltage keeps stablizing, and IGBT switching frequency is fixed, so that switching loss becomes smaller；
Work as Umin> UdOr Ud> UmaxWhen, illustrate that direct current lateral load or exchange side voltage are mutated, so that DC side
Voltage is also mutated.At this moment it answers controller to select hysteretic loop current control, DC voltage quick response can be made to arrive in this way
Stability range, the mutation value for reducing DC voltage reduces time of the DC voltage under unstable voltage, so that rectifier
Or even whole system is relatively reliable.
Detailed description of the invention
Fig. 1 is system entire block diagram provided in an embodiment of the present invention.
Fig. 2 is transient current testing block diagram provided in an embodiment of the present invention.
Fig. 3 is hysteretic loop current control block diagram provided in an embodiment of the present invention.
Fig. 4 is stagnant ring modulation principle figure provided in an embodiment of the present invention.
Fig. 5 is that switching signal provided in an embodiment of the present invention judges selection figure.
Fig. 6 is simulation result comparison diagram provided in an embodiment of the present invention.
Specific embodiment
In order to keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, the present invention is carried out
It is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit
The present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
One, rectifier module and control module design.
As shown in Fig. 2, transient current testing is double-closed-loop control structure, it mainly include phase-locked loop pll, Voltage loop VCL, electricity
Flow ring CCL, SPWM modulating part；
By taking a phase in three-phase as an example, system feedback ua、ia、ud、id.Voltage loop is with DC voltage actual value and direct current
Side voltage given value is input, and the dynamic value of current on line side is exported by pi regulator:
IN1=Kp(Ud *-Ud)+KI∫(Ud *-Ud)dt
To mitigate outer voltage PI load, voltage inter-loop is with DC side current actual value, the given value of DC voltage, net
Side voltage effective value is input, by being obtained by net side and DC side active power conservation:
IN2=Id×Ud÷Un
Show that the stationary value of voltage on line side, the two are added the practical reference value for then obtaining voltage on line side:
IN *=IN1+IN2
Locking phase loop section is exported voltage on line side PGC demodulation by electric voltage feed forward part by electric current loop and Voltage loop
Current on line side given value obtain electric voltage feed forward amount ω La Ia *cosωt.There is electric voltage feed forward amount plus a G again2[IN *sinω
T-iN(t)] link obtains rectifier bridge voltage on line side:
ua(t)=uN(t)+ωLNIN *cosωt+G2[IN *sinωt-iN(t)]
It regard the normalization of rectifier bridge voltage on line side as modulating wave u againa, thus obtained the modulation of the corresponding bridge arm of a
Signal, so that system has High Power Factor, keeps the phase of voltage on line side and electric current.SPWM part again by modulating wave with
The triangular carrier of input is compared to generate the switching device of pwm control signal control a phase, and switching device is made to keep switch
Frequency-invariant reduces the loss of switching device.
It is also double-closed-loop control structure as transient current testing technology if Fig. 3 is hysteretic loop current control structure chart, it is main
It to include Voltage loop, phase-locked loop pll, current hysteresis-band control part HCC, also by taking a phase in three-phase as an example, wherein being passed through by outer voltage
It crosses PI controller and obtains current on line side stationary value IN1 *, then current on line side dynamic value I obtained by active power conservationN2 *.Wherein:
IN2 *=Id×K
From DC side net power scale conservation:
Obtain a phase current on line side with reference to virtual value I in this wayN *=IN1 *+IN2 *, as Fig. 3 obtains net side electricity by phase-locked loop pll
Flow reference value iN *, voltage on line side current in phase position is ensured that in this way, improves rectifier power factor；Current hysteresis-band control part is logical
It crosses current on line side actual value iaCompared with the given value obtained, such as Fig. 4, the pulse signal of control switch device is generated.
As it is prominent to devise a load easy to accomplish after the switch control signal for obtaining two kinds of control methods by Fig. 5
Become automatic recognition system, in rectifier work in stable state, rectifier uses transient current testing；When loading mutation,
Rectifier uses hysteretic loop current control, enables in DC voltage faster response to stability range.
Two, transient current and hysteresis current hybrid control system design.
DC voltage actual value need to thus be avoided that practical straight by being compared after low-pass filtering with reference voltage value
Stream side voltage there is when fluctuation causes voltage be in critical judgement point due to voltage fluctuation make control signal switching frequency mistake
Height leads to spread of voltage；DC voltage actual value is set as Ud, reference voltage minimum Umin, reference voltage maximum value
For Umax, then have:
Work as Umin≤Ud< UmaxWhen, illustrate that DC voltage is in stability range, controller is at this moment answered to select transient current
Control, so that DC voltage keeps stablizing, and IGBT switching frequency is fixed, so that switching loss becomes smaller；
Work as Umin> UdOr Ud> UmaxWhen, illustrate that direct current lateral load or exchange side voltage are mutated, so that DC side
Voltage is also mutated, and is at this moment answered controller to select hysteretic loop current control, DC voltage quick response can be made to arrive in this way
Stability range, the mutation value for reducing DC voltage reduce time of the DC voltage under unstable voltage.
Application effect of the invention is described in detail below with reference to emulation.
By emulating come the correctness of access control strategy design, built in matlab/simulink as shown in Figure 1
Three-phase rectifier model,
Wherein Ua、Ub、UcFor equivalent net side voltage source, amplitude is 380V and three-phase symmetrical, DC side given voltage U*=
500V, La、Lb、LcIt is 5e-3mH, DC side Support Capacitor C for net side inductanced=3mF, secondary filtering inductance C2=3mF, filtering
Resistance L2=0.84mH, two kinds of controls are all with identical PI controller, KP=0.2, KI=3；
In t=3s, when bearing power is mutated by 2.5kW to 12.5kW transient control with mix control DC voltage waveform
Comparison is as shown in fig. 6, it is apparent that more using voltage responsive speed in rectifier DC side after the mixing control of this paper
Fastly, voltage fluctuation is smaller, and it is also shorter to reach the stable time；Using the control method of this paper, voltage jump recognizer can have
The identification voltage fluctuation of effect ground simultaneously switches between different control algolithms.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of mixing control method of Three-Phase PWM Rectifier, which comprises the following steps:
Step 1, rectifier carry out the operation of transient current testing and hysteretic loop current control in controller simultaneously at runtime, obtain
Switch control signal under two kinds of algorithms.
Step 2 judges whether DC voltage is in stable range, if it is going to step 3, if it is not, going to step 4.
Step 3 remains unchanged if hybrid algo-rithm output switch control signal is transient current testing signal, if output is opened
Closing control signal is that hysteretic loop current control signal is then switched to transient current testing signal.
Step 4 remains unchanged if hybrid algo-rithm output switch control signal is hysteretic loop current control signal, if output is opened
Closing control signal is that transient current testing signal is then switched to hysteretic loop current control signal.
2. a kind of mixing control method using a kind of Three-Phase PWM Rectifier described in claim 1, which is characterized in that step 1
In two kinds of algorithms feedback quantity it is the same, can simultaneously operation is carried out in the controller of a rectifier, used one in step 2
Whether kind simply and effectively judges algorithm, judge DC voltage in stability range, the difference of the range according to locating for voltage
Corresponding control method is selected, so that rectifier performance is optimized.
Work as Umin≤Ud< UmaxWhen, illustrate that DC voltage is in stability range.At this moment controller is answered to select transient current testing,
So that DC voltage keeps stablizing, and IGBT switching frequency is fixed, so that switching loss becomes smaller.
Work as Umin> UdOr Ud> UmaxWhen, illustrate that direct current lateral load or exchange side voltage are mutated, so that DC voltage
Also it is mutated.At this moment it answers controller to select hysteretic loop current control, can make DC voltage quick response to stabilization in this way
Range, the mutation value for reducing DC voltage reduce time of the DC voltage under unstable voltage so that rectifier or even
Whole system is relatively reliable.
3. a kind of mixing control method of Three-Phase PWM Rectifier as claimed in claim 2, which is characterized in that with A phase in three-phase
For, it is all DC voltage U with certain that transient current testing algorithm and hysteretic loop current control algorithm input feedback amount are the samed,
DC side electric current Id, exchange side phase voltage ua, ac-side current ia.Current on line side is obtained with reference to effective by identical Voltage loop
Value IN *, just in next modulation, transient current testing is by electric voltage feed forward part, by electric current loop for the difference of two kinds of control
Electric voltage feed forward amount ω L is obtained with the current on line side given value of Voltage loop outputN IN *cosωt.There is electric voltage feed forward amount plus one again
A G2[IN *Sin ω t-iN(t)] link obtains the modulation voltage of a commutating phase device, carries out after modulation voltage is normalized
SPWM modulation, thus obtain the switch modulation signal of this phase bridge arm, because of SPWM modulated process, it is such go out open
Control signal frequency is closed to fix.And hysteretic loop current control is then by by a certain phase current on line side actual value and the reference that obtains
Value, is compared by stagnant ring, generates the pulse signal of control switch device, is not needed to carry out SPWM modulation, is thus accelerated control
The response speed of device processed, so that the response of DC voltage is faster.
4. a kind of mixing control method of Three-Phase PWM Rectifier as claimed in claim 3, which is characterized in that obtain at the same time
After switching signal under two kinds of controls, judges whether DC voltage is in stability range, then carry out switch letter
Number switching, DC voltage actual value need to thus be avoided that reality by be compared after low-pass filtering with reference voltage value
DC voltage there is when fluctuation causes voltage to be in critical judgement point due to voltage fluctuation make control signal switching frequency
It is excessively high to lead to spread of voltage.
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| CN104836460A (en) * | 2015-06-04 | 2015-08-12 | 湖南大学 | Positive- and negative-sequence combined control method for three-phase PWM current transformer when power grid is imbalanced |
| US20170018932A1 (en) * | 2015-07-13 | 2017-01-19 | Majid Pahlevaninezhad | Pv inverter with micro/nano-grid integration capability |
| CN107896071A (en) * | 2017-11-24 | 2018-04-10 | 哈尔滨理工大学 | A kind of three phase combined inverter based on neutral net |
-
2018
- 2018-12-21 CN CN201811573090.8A patent/CN109617434A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741265A (en) * | 2008-11-07 | 2010-06-16 | 冠捷投资有限公司 | Control device of AC/DC converter |
| CN103414359A (en) * | 2013-05-17 | 2013-11-27 | 华南理工大学 | Control method for unbalanced input of matrix rectifier |
| CN104836460A (en) * | 2015-06-04 | 2015-08-12 | 湖南大学 | Positive- and negative-sequence combined control method for three-phase PWM current transformer when power grid is imbalanced |
| US20170018932A1 (en) * | 2015-07-13 | 2017-01-19 | Majid Pahlevaninezhad | Pv inverter with micro/nano-grid integration capability |
| CN107896071A (en) * | 2017-11-24 | 2018-04-10 | 哈尔滨理工大学 | A kind of three phase combined inverter based on neutral net |
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