CN108599598A - A kind of control method for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage - Google Patents
A kind of control method for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage Download PDFInfo
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- CN108599598A CN108599598A CN201711356840.1A CN201711356840A CN108599598A CN 108599598 A CN108599598 A CN 108599598A CN 201711356840 A CN201711356840 A CN 201711356840A CN 108599598 A CN108599598 A CN 108599598A
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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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- 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
- H02M7/2173—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 biphase or polyphase circuit arrangement
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention discloses a kind of control method for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage.The control method solves the problems, such as the stable operation of PWM rectifier under quick fluctuation operating mode using the method that both voltage feed-forward control and busbar voltage fluctuation feedforward combine.It is specific as follows：1) sampling three-phase network voltage is filtered (cutoff frequency is selected as near system bandwidth frequency) using moving average filter, is fed forward to electric current loop output.2) sampling DC bus-bar voltage seeks the fluctuating change amount of DC bus current using the variable quantity of voltage, is fed forward to the output of DC bus-bar voltage ring.By the combination of two ways, avoid oscillation problem caused by the possibility of high frequency feedforward, by solve the problems, such as cake resistancet delay lead to the decreased effectiveness that feedovers.
Description
Technical field
The invention belongs to power electronics control fields, are related to a kind of control method of PWM rectifier.
Background technology
In field of distribution network, because General System capacity is all little, while having much there are the scene of impact load, because
It works repeatedly for impact load, causes network voltage that more quick and violent fluctuation occurs, for example steel mill is in steel rolling moment
The power of electric arc furnaces is very big, and multiple devices carry out steel rolling at random, leads to the very frequent violent fluctuation of network voltage.Stone for another example
Exploration activity scene, the random work of more kowtowing machines lead to the big ups and downs of network voltage.Similar also has aluminium manufacturer, automobile system
It makes.It is necessary in the PWM rectifier equipments such as the power supply with PWM rectifier of such field application or APF, SVG
There is extraordinary adaptability to the quick violent fluctuation of power grid.
Currently under power grid rapid fluctuations operating mode, the adaptability of PWM rectifier, effective measures are not in fact in industry
It is more.Measure in the majority using raising open-loop gain or increase voltage feed-forward control, for above-mentioned several scenes, general PWM is whole
The power for managing device is all very big, and the raising of open-loop gain is very limited.It is a good method to increase voltage feed-forward control, still
Filter must be increased, it would be possible to the noise rate of system oscillation can be caused to remove, but filter will certainly lead to network voltage
The real-time of feedforward is deteriorated, and then effect is deteriorated, and network voltage slightly quickly significantly fluctuates, and equipment protect by overcurrent or overvoltage
Shield.
Invention content
It is an object of the invention to solve the stable operation of PWM rectifier under the quick fluctuation operating mode of network voltage to ask
Topic proposes a kind of control method of new Three-Phase PWM Rectifier.
Technical scheme is as follows：
Compared with prior art, the present invention is feedovered using voltage feed-forward control and busbar voltage fluctuation, and what the two combined does
Method solves the problems, such as the stable operation of PWM rectifier under quick fluctuation operating mode.It is specific as follows：1) sampling three-phase network voltage,
It is filtered (cutoff frequency is selected as near system bandwidth frequency) using moving average filter, is fed forward to electric current loop output.2)
Sampling DC bus-bar voltage seeks the fluctuating change amount of DC bus current, is fed forward to DC bus using the variable quantity of voltage
Voltage loop exports.
In order to preferably play the effect of control method of the present invention, PWM rectifier topological structure is further set：Topology is adopted
With voltage-type 3-phase power converter, power device uses IGBT, inverter bridge to be connected with power grid by the filtering mode of LCL, direct current
Side uses electrolytic capacitor (large capacity).
Steps are as follows for specific implementation：
A. sampling three-phase network voltage locks the phase angle of power grid using the soft-lock phase algorithm based on Instantaneous Power Theory
Phase obtains power grid angle, θ.
B. sampling d-c bus voltage value makes the difference with given voltage 800V, obtains error signal, is carried out using pi regulator
It controls to adjust, obtains signal Udc_k.
C. using the DC bus-bar voltage sampled the electric current of DC bus capacitor is obtained in conjunction with the capacitance of DC bus
Undulate quantity is multiplied by proportionality coefficient k, obtains Udc_i, this is the feedforward value of DC bus-bar voltage fluctuation.
D.Udc_k and component of the Δ Udc_i summed results as active axis, idle axis component are assigned a value of 0, carry out DQ/ABC
The transformation of coordinate system obtains three-phase active command Iap (t), Ibp (t), Icp (t).
E. sampling three-phase inductive current instantaneous value Ia (t), Ib (t), Ic (t), Iap (t) that link d is obtained, Ibp (t),
Icp (t) is utilized respectively P adjusters with Ia (t), Ib (t), Ic (t) and carries out closed-loop control, obtains three-phase modulations wave.
F. the instantaneous value Ua (t) of sampling three-phase network voltage, Ub (t), Uc (t), are filtered using moving average filter
The cutoff frequency of wave, filter is selected as bandwidth frequency nearby, is multiplied by proportionality coefficient k, obtains three-phase power grid voltage feedforward value Ua_q,
Ub_q, Uc_q.
G. three-phase power grid voltage feedforward value Ua_q, Ub_q, Uc_q are added with obtained by e per phase modulating wave numerical value respectively.
Magnitude obtained by h.g changes by ABC/ α β coordinate systems, obtains α, beta -axis component, is sent into space vector module SVPWM,
The PWM driving waves of six pipes of three-phase are obtained, realize the control operation of whole system.
The invention has the advantages that：
The present invention solves quickly big amplitude wave using the method that both voltage feed-forward control and busbar voltage fluctuation feedforward combine
The stable operation problem of PWM rectifier under condition of starting building.By the combination of two ways, caused by the possibility for avoiding high frequency feedforward
Oscillation problem, by solve the problems, such as cake resistancet delay cause feedover decreased effectiveness.The method has very big application
Foreground.
Description of the drawings
Fig. 1 is the main circuit topological structure schematic diagram of the present invention.
Fig. 2 is the control block diagram of control method of the present invention.
Specific implementation mode
With reference to specific embodiments and the drawings, the present invention is described in more detail：
It is PWM rectifier topological structure as shown in Figure 1：Topology is using voltage-type 3-phase power converter as a result, power device is adopted
With IGBT, inverter bridge is connected by the filtering mode of LCL with power grid, and DC side uses the electrolytic capacitor of large capacity.
The control method of the Three-Phase PWM Rectifier of the present invention realizes that step is as shown in Figure 2：
A. sampling three-phase network voltage locks the phase angle of power grid using the soft-lock phase algorithm based on Instantaneous Power Theory
Phase obtains power grid angle, θ.
B. sampling d-c bus voltage value makes the difference with given voltage 800V, obtains error signal, is carried out using pi regulator
It controls to adjust, obtains signal Udc_k.
The pi regulator of use：
U=Rk-1+Kp*ek
umax(U ＞ umax)
uk=umin(U≤umax)
U
Rk=Rk-1+KI*ek+Kc(uk-U)
Wherein Kc correction factorsKp=6.0, KI=0.5.
C. using the DC bus-bar voltage sampled the electric current of DC bus capacitor is obtained in conjunction with the capacitance of DC bus
Undulate quantity is multiplied by proportionality coefficient k, obtains Udc_i, this is the feedforward value of DC bus-bar voltage fluctuation.
The convenience of digital control calculating is made full use of herein.This system dc-link capacitance capacity is 5500uF；Direct current
Busbar controlling cycle is 0.6ms, and the sample frequency of DC bus-bar voltage is 20KHz.By controlling cycle 0.6ms, it is divided into 3 parts, point
Its bus current variable quantity is not calculated, and three parts are sought before averagely preventing from causing because of the exception for sampling noise or sampled value
That presents is excessive.Specific formula is as follows：
Wherein, when Udc0, Udc0.2, Udc0.4, Udc0.6 are 0 moment, 0.2ms moment, 0.4ms moment, 0.6ms respectively
The busbar voltage numerical value at quarter, Δ t are 0.2ms.
D.Udc_k and component of the Δ Udc_i summed results as active axis, idle axis component are assigned a value of 0, carry out DQ/ABC
The transformation of coordinate system obtains three-phase active command Iap (t), Ibp (t), Icp (t).
Transformation for mula is as follows：
Wherein,
Wherein,
E. sampling three-phase inductive current instantaneous value Ia (t), Ib (t), Ic (t), Iap (t), Ibp (t), the Icp obtained in c
(t) it is utilized respectively P adjusters with Ia (t), Ib (t), Ic (t) and carries out closed-loop control, obtain three-phase modulations wave.
F. the instantaneous value Ua (t) of sampling three-phase network voltage, Ub (t), Uc (t), are filtered using moving average filter
The cutoff frequency of wave, filter is selected as bandwidth frequency nearby, is multiplied by proportionality coefficient k, obtains three-phase power grid voltage feedforward value Ua_q,
Ub_q, Uc_q.
Network voltage feedforward in real time needs plus low-pass filter, if being not added with filtering, the noise other than bandwidth enters control
System, the oscillation of meeting noise factor.So select the frequency near bandwidth as the cutoff frequency of filter, it so on the one hand can
To prevent from vibrating, on the one hand feedovered in real time using network voltage to greatest extent.This system uses the moving average filter of 5ms
Device.
The specific implementation formula of moving average filter：
Wherein N is 10, x (i) network voltage instantaneous values.
G. three-phase power grid voltage feedforward value Ua_q, Ub_q, Uc_q are added with obtained by e per phase modulating wave numerical value respectively.
Magnitude obtained by h.g changes by ABC/ α β coordinate systems, obtains α, beta -axis component, is sent into space vector module SVPWM,
The PWM driving waves of six pipes of three-phase are obtained, realize the control operation of whole system.
Claims (3)
1. a kind of control method for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage, it is characterised in that：
It is carried out at the same time voltage feed-forward control and busbar voltage fluctuation feedforward；It is specific as follows respectively：
Voltage feed-forward control：Sampling three-phase network voltage, is filtered using moving average filter, and cutoff frequency is selected as system
Near bandwidth frequency, it is fed forward to electric current loop output；
Busbar voltage fluctuation feedovers：Sampling DC bus-bar voltage seeks the fluctuation of DC bus current using the variable quantity of voltage
Variable quantity is fed forward to the output of DC bus-bar voltage ring.
2. the control according to claim 1 for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage
Method, it is characterised in that：The topological structure of the Three-Phase PWM Rectifier, using voltage-type 3-phase power converter, power device is
IGBT, inverter bridge are connected by the filtering mode of LCL with power grid, and DC side uses electrolytic capacitor.
3. the control according to claim 1 for the Three-Phase PWM Rectifier under the quick fluctuation operating mode of network voltage
Method, it is characterised in that：It is realized especially by following link：
A. sampling three-phase network voltage obtains power grid angle, θ to the phase angle of power grid using soft-lock phase algorithm into horizontal lock；
B. sampling d-c bus voltage value makes the difference with given voltage, obtains error signal, is controlled to adjust using pi regulator,
Obtain signal Udc_k；
C. using the DC bus-bar voltage sampled the current fluctuation of DC bus capacitor is obtained in conjunction with the capacitance of DC bus
Amount, is multiplied by proportionality coefficient k, obtains signal Udc_i, this is the feedforward value of DC bus-bar voltage fluctuation；
D. signal Udc_k and component of the signal delta Udc_i summed results as active axis, idle axis component are assigned a value of 0, carry out
The transformation of DQ/ABC coordinate systems obtains three-phase active command Iap (t), Ibp (t), Icp (t)；
E. sampling three-phase inductive current instantaneous value Ia (t), Ib (t), Ic (t), Iap (t) that link d is obtained, Ibp (t), Icp (t)
It is utilized respectively P adjusters with Ia (t), Ib (t), Ic (t) and carries out closed-loop control, obtains three-phase modulations wave；
F. the instantaneous value Ua (t) of sampling three-phase network voltage, Ub (t), Uc (t), are filtered using moving average filter, filter
The cutoff frequency of wave device be selected as bandwidth nearby frequency, be multiplied by proportionality coefficient k, obtain three-phase power grid voltage feedforward value Ua_q, Ub_q,
Uc_q；
G. three-phase power grid voltage feedforward value Ua_q, Ub_q, Uc_q are accordingly added with obtained by link e per phase modulating wave numerical value respectively；
H. magnitude obtained by link g changes by ABC/ α β coordinate systems, obtains α, beta -axis component, is sent into space vector module SVPWM,
To realize the control operation of whole system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114696347A (en) * | 2022-05-31 | 2022-07-01 | 新风光电子科技股份有限公司 | Active island judgment system and method for energy storage system |
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