CN106787851A - A kind of Single-phase PWM Rectifier control method for suppressing starting current - Google Patents
A kind of Single-phase PWM Rectifier control method for suppressing starting current Download PDFInfo
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- CN106787851A CN106787851A CN201611265068.8A CN201611265068A CN106787851A CN 106787851 A CN106787851 A CN 106787851A CN 201611265068 A CN201611265068 A CN 201611265068A CN 106787851 A CN106787851 A CN 106787851A
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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Abstract
The embodiment of the invention discloses a kind of Single-phase PWM Rectifier control method for suppressing starting current, the embodiment of the present invention is connected with power resistor by using inductance and dash current output is suppressed first, rectifier DC voltage is reached alternating current voltage crest；Then by starting relay short-circuit power resistance, and DC voltage is made to reach setting value using the method control rectifier that outer voltage ladder gives by digitial controller；The low pass filter of appropriate cut-off frequency and the amplitude limit link of appropriate limiting threshold is added to carry out the size of limiting starting current finally by outer voltage output.Have starting current small using the Single-phase PWM Rectifier of this control method, rapidity quite and the suitable characteristic of robustness, with preferable engineering application value.
Description
Technical field
Start the present invention relates to the electric and electronic technical field with bidirectional energy feedback function, more particularly to a kind of suppression
The Single-phase PWM Rectifier control method of electric current.
Background technology
With development of modern industry, the extensive use of power electronic equipment and nonlinear load generates substantial amounts of harmonic wave,
Harmonic Current in Power System composition is caused to increase rapidly, current waveform distortion increases the loss of line loss and electrical equipment, is
System power factor is drastically reduced, and has a strong impact on the power network quality of power supply.
Because PWM rectifier can realize current on line side sineization and run under unity power factor state, and
But also with the function of bidirectional energy feedback.Therefore PWM rectifier is obtained in the occasion that exchange conversion direct current is exchanged with DC converting
It is widely applied.
At present, the dash current and runaway current produced by Single-phase PWM Rectifier start-up course are all very big.If be not added with
To suppress or solve, the switching tube and inductance of main circuit must just be chosen and can bear the model of more high current, and this certainly will
The volume and cost of rectifier can be increased.If appropriate control method can be taken to reduce the impact occurred in start-up course
Electric current and runaway current, can not only reduce the margin of power of rectifier can also improve the reliability of system.
The content of the invention
A kind of Single-phase PWM Rectifier control method for suppressing starting current is the embodiment of the invention provides, can significantly be dropped
Produced dash current and runaway current and pressed down significantly caused by ovennodulation in low Single-phase PWM Rectifier start-up course
Produced overshoot electric current during Single-phase PWM Rectifier regulation processed.
A kind of Single-phase PWM Rectifier control method for suppressing starting current is the embodiment of the invention provides, including：
S1：Ac-side current value, AC magnitude of voltage and the DC voltage value at current time are got, to the exchange
Side current value and the AC magnitude of voltage enter line translation and are calculated ac-side current d axles component and ac-side current q axles
Component；
S2：Rejection frequency signal operation and the operation of median average filter are carried out to the DC voltage value, is filtered
Magnitude of voltage after ripple, and preset step voltage values are got, to the preset step voltage values and the filtered magnitude of voltage
Carry out being calculated DC voltage outer shroud deviation；
S3：Operation and filtering operation are adjusted to the DC voltage outer shroud deviation, current output value is obtained, passed through
Whether amplitude limit link judges the current output value more than preset current maximum, if being more than, by the preset current maximum
Value assign the current output value, if being not more than, judge whether the current output value is less than preset current minimum value, if institute
Current output value is stated less than preset current minimum value, the current output value is assigned by the value of the preset current minimum value, if
The current output value is not less than preset current minimum value, exports the current output value；
S4：The current output value is converted into given value of current value, to the given value of current value and the ac-side current d
Axle component carries out deviation and is calculated electric current d axle deviations, and carrying out deviation to the ac-side current q axles component is calculated electric current
Q axle deviations, and the electric current d axles deviation, the q axles component are respectively calculated and obtain voltage d by PI digitial controllers
Axle component and voltage q axle components；
S5：The voltage d axles component, the voltage q axle components are entered by preset first formula and preset second formula
Row is calculated rectifier desired output, and the rectifier desired output is carried out into SPWM modulation obtains the defeated of rectifier switch pipe
Go out driving pulse.
Preferably, the ac-side current value for getting current time, AC magnitude of voltage and DC voltage value, right
The ac-side current value and the AC magnitude of voltage enter line translation and are calculated ac-side current d axles component and AC
Also include before electric current q axle components：
The power resistor of AC and inductance are connected, in rectifier DC side voltage increase to AC voltage peak
Afterwards, closure starting relay causes power resistor short circuit, then performs S1.
Preferably, it is described by preset first formula and preset second formula to the voltage d axles component, the voltage q
Axle component carries out being calculated rectifier desired output, and the rectifier desired output is carried out into SPWM modulation obtains rectifier and open
Also include after the output driving pulse for closing pipe：
The load-relay for closing DC side causes that load accesses direct current lateral circuit, and re-executes S1 to S5.
Preferably, the ac-side current value for getting current time, AC magnitude of voltage and DC voltage value, right
The ac-side current value and the AC magnitude of voltage enter line translation and are calculated ac-side current d axles component and AC
Electric current q axle components are specifically included：
After ac-side current value, AC magnitude of voltage and the DC voltage value for getting current time, by the friendship
Stream side current value is projected on α axles and β axles, obtains α axial projections value and β axial projections value；
The AC magnitude of voltage is carried out by Second Order Generalized Integrator phaselocked loop be calculated the AC voltage
The phase of value and sine value corresponding with the phase of the AC magnitude of voltage and cosine value；
The α axial projections are worth by preset 3rd formula and preset 4th formula, the β axial projections value and with the friendship
The corresponding sine value of phase and cosine value for flowing side magnitude of voltage carry out being calculated ac-side current d axles component and ac-side current
Q axle components.
Preferably, it is described that rejection frequency signal operation and median average filter behaviour are carried out to the DC voltage value
Make, obtain filtered magnitude of voltage, and get preset step voltage values, after the preset step voltage values and the filtering
Magnitude of voltage carry out being calculated DC voltage outer shroud deviation and specifically include：
By trap frequency for the digital second order trapper of 100Hz be calculated filtering to the DC voltage value
Magnitude of voltage after frequency；
The operation of median average filter is carried out to the magnitude of voltage after the rejection frequency and obtains filtered magnitude of voltage；
Preset voltage values are got, the preset voltage values are carried out to be calculated preset ladder by preset 5th formula
Magnitude of voltage；
The preset step voltage values and the filtered magnitude of voltage are calculated by preset 6th formula
DC voltage outer shroud deviation.
Preferably, it is described that operation and filtering operation are adjusted to the DC voltage outer shroud deviation, obtain electric current defeated
Go out value, whether the current output value is judged more than preset current maximum by amplitude limit link, if being more than, by the preset electricity
Whether less than preset current most the value for flowing maximum assigns the current output value, if being not more than, judge the current output value
Small value, if the current output value is less than preset current minimum value, the electric current is assigned by the value of the preset current minimum value
Output valve, if the current output value is not less than preset current minimum value, exports the current output value and specifically includes：
The DC voltage outer shroud deviation is adjusted being calculated regulation by outer voltage PI digitial controllers
Current output value afterwards；
The current output value after the regulation is filtered by outer voltage low-pass first order filter is calculated electricity
Stream output valve；
Whether the current output value is judged more than preset current maximum by amplitude limit link, if being more than, will be described pre-
Whether the value for putting current maxima assigns the current output value, if being not more than, judge the current output value less than preset electricity
Stream minimum value, if the current output value is less than preset current minimum value, the value of the preset current minimum value is assigned described
Current output value, if the current output value is not less than preset current minimum value, exports the current output value.
Preferably, preset 3rd formula is：
id(k)=sin θ × iα(k)-cosθ×iβ(k)；
Preset 4th formula is：
iq(k)=cos θ × iα(k)+sinθ×iβ(k)
Wherein, iαK () is worth for α axial projections；iβK () is worth for β axial projections；Sin θ is corresponding with the phase of AC magnitude of voltage
Sine value；Cos θ are cosine value corresponding with the phase of AC magnitude of voltage；idK () is ac-side current d axle components；iq(k)
It is ac-side current q axle components.
Preferably, the 5th preset formula is：
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)
Wherein, udcchushi *K () is preset voltage values；step*For the gradient that ladder gives.
Preferably, the 6th preset formula is：
eu(k)=udc *(k)-udcmm(k)
Wherein, udcmmK () is filtered magnitude of voltage.
Preferably, the described first preset formula is：
urα(k)=sin θ × ud(k)+cosθ×uq(k)；
Preset second formula is：
Vr(k)=us(k)-urα(k)
Wherein, sin θ is sine value corresponding with the phase of AC magnitude of voltage；Cos θ are the phase with AC magnitude of voltage
The corresponding cosine value in position；udK () is voltage d axle components；uqK () is voltage q axle components.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The embodiment of the invention provides a kind of Single-phase PWM Rectifier control method for suppressing starting current includes：S1：Obtain
Ac-side current value, AC magnitude of voltage and DC voltage value to current time, to the ac-side current value and described
AC magnitude of voltage enters line translation and is calculated ac-side current d axles component and ac-side current q axle components；S2：To described
DC voltage value carries out rejection frequency signal operation and the operation of median average filter, obtains filtered magnitude of voltage, and obtain
Preset step voltage values are got, the preset step voltage values and the filtered magnitude of voltage are carried out being calculated DC side
Outer voltage deviation；S3：Operation and filtering operation are adjusted to the DC voltage outer shroud deviation, electric current output is obtained
Whether value, judge the current output value more than preset current maximum, if being more than, by the preset current by amplitude limit link
The value of maximum assigns the current output value, if being not more than, judges whether the current output value is minimum less than preset current
Value, if the current output value is less than preset current minimum value, assigns the electric current defeated by the value of the preset current minimum value
Go out value, if the current output value is not less than preset current minimum value, export the current output value；S4：The electric current is defeated
Go out value and be converted to given value of current value, the given value of current value and the ac-side current d axles component are carried out by deviation and be calculated
Electric current d axle deviations, deviation are carried out to the ac-side current q axles component and are calculated electric current q axle deviations, and controlled by PI numerals
Device processed is respectively calculated to the electric current d axles deviation, the q axles component and obtains voltage d axles component and voltage q axle components；S5：
The voltage d axles component, the voltage q axles component be calculated by preset first formula and preset second formula whole
Stream device desired output, the output driving pulse that SPWM modulation obtains rectifier switch pipe is carried out by the rectifier desired output.
The embodiment of the present invention is connected with power resistor by using inductance and dash current output is suppressed first, makes rectifier
DC voltage reaches alternating current voltage crest；Then by starting relay short-circuit power resistance, and electricity is used by digitial controller
The given method control rectifier of pressure outer shroud ladder makes DC voltage reach setting value；Added finally by outer voltage output suitable
When the low pass filter of cut-off frequency and the amplitude limit link of appropriate limiting threshold carry out the size of limiting starting current.The present invention is implemented
Example can be greatly lowered produced dash current and the electricity out of control caused by ovennodulation in Single-phase PWM Rectifier start-up course
Produced overshoot electric current during stream and the significantly regulation of suppression Single-phase PWM Rectifier, and using the single-phase of this control method
PWM rectifier has starting current small, rapidity quite and the suitable characteristic of robustness, with preferable engineering application value.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is a kind of flow of Single-phase PWM Rectifier control method for suppressing starting current provided in an embodiment of the present invention
Schematic diagram；
Fig. 2 is the single-phase PWM rectification main circuit topological diagram for effectively suppressing starting current；
Fig. 3 is the embodiment schematic diagram of control algolithm；
Fig. 4 is based on the single-phase PWM rectification control method program flow diagram for effectively suppressing starting current.
Specific embodiment
A kind of Single-phase PWM Rectifier control method for suppressing starting current is the embodiment of the invention provides, can significantly be dropped
Produced dash current and runaway current and pressed down significantly caused by ovennodulation in low Single-phase PWM Rectifier start-up course
Produced overshoot electric current during Single-phase PWM Rectifier regulation processed.
To enable that goal of the invention of the invention, feature, advantage are more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described, it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Fig. 1 is referred to, a kind of Single-phase PWM Rectifier control method for suppressing starting current provided in an embodiment of the present invention
One embodiment, including：
101st, ac-side current value, AC magnitude of voltage and the DC voltage value at current time are got, to AC
Current value and AC magnitude of voltage enter line translation and are calculated ac-side current d axles component and ac-side current q axle components；
102nd, rejection frequency signal operation and the operation of median average filter are carried out to DC voltage value, after being filtered
Magnitude of voltage, and get preset step voltage values, preset step voltage values and filtered magnitude of voltage are calculated
DC voltage outer shroud deviation；
103rd, operation and filtering operation are adjusted to DC voltage outer shroud deviation, current output value is obtained, by limit
Width link judges that whether the value of preset current maximum, more than preset current maximum, if being more than, is assigned electricity by current output value
Whether stream output valve, if being not more than, judge current output value less than preset current minimum value, if current output value is less than preset electricity
Stream minimum value, current output value is assigned by the value of preset current minimum value, if current output value is not less than preset current minimum value,
Output current output valve；
104th, current output value is converted into given value of current value, given value of current value and ac-side current d axles component is carried out
Deviation is calculated electric current d axle deviations, and carrying out deviation to ac-side current q axles component is calculated electric current q axle deviations, and passes through
PI digitial controllers are respectively calculated to electric current d axles deviation, q axle components and obtain voltage d axles component and voltage q axle components；
105th, voltage d axles component, voltage q axle components are calculated by preset first formula and preset second formula
To rectifier desired output, rectifier desired output is carried out into the output driving pulse that SPWM modulation obtains rectifier switch pipe.
A kind of another implementation of Single-phase PWM Rectifier control method for suppressing starting current provided in an embodiment of the present invention
Example, including：
201st, the power resistor of AC and inductance are connected, in rectifier DC side voltage increase to AC Voltage Peak
After value, closure starting relay causes power resistor short circuit, and performs 202；
202nd, after ac-side current value, AC magnitude of voltage and the DC voltage value for getting current time, will hand over
Stream side current value is projected on α axles and β axles, obtains α axial projections value and β axial projections value；
203rd, AC magnitude of voltage is carried out by Second Order Generalized Integrator phaselocked loop being calculated AC magnitude of voltage
Phase and sine value corresponding with the phase of AC magnitude of voltage and cosine value；
204th, α axial projections are worth by preset 3rd formula and preset 4th formula, β axial projections be worth and with AC voltage
The corresponding sine value of phase and cosine value of value carry out being calculated ac-side current d axles component and ac-side current q axle components；
205th, by trap frequency for the digital second order trapper of 100Hz to DC voltage value be calculated filtering
Magnitude of voltage after frequency；
206th, the operation of median average filter is carried out to the magnitude of voltage after rejection frequency and obtains filtered magnitude of voltage；
207th, preset voltage values are got, preset voltage values is carried out to be calculated preset ladder by preset 5th formula
Magnitude of voltage；
208th, preset step voltage values and filtered magnitude of voltage are carried out being calculated direct current by preset 6th formula
Side outer voltage deviation；
209th, DC voltage outer shroud deviation is adjusted being calculated regulation by outer voltage PI digitial controllers
Current output value afterwards；
210th, the current output value after regulation is filtered by outer voltage low-pass first order filter and is calculated electricity
Stream output valve；
211st, whether current output value is judged more than preset current maximum by amplitude limit link, if being more than, by preset electricity
Whether the value for flowing maximum assigns current output value, if being not more than, current output value is judged less than preset current minimum value, if electric
Stream output valve is less than preset current minimum value, current output value is assigned by the value of preset current minimum value, if current output value is not
Less than preset current minimum value, output current output valve；
212nd, current output value is converted into given value of current value, given value of current value and ac-side current d axles component is carried out
Deviation is calculated electric current d axle deviations, and carrying out deviation to ac-side current q axles component is calculated electric current q axle deviations, and passes through
PI digitial controllers are respectively calculated to electric current d axles deviation, q axle components and obtain voltage d axles component and voltage q axle components；
213rd, voltage d axles component, voltage q axle components are calculated by preset first formula and preset second formula
To rectifier desired output, rectifier desired output is carried out into the output driving pulse that SPWM modulation obtains rectifier switch pipe；
214th, the load-relay of closure DC side causes that load accesses direct current lateral circuit, and re-executes 202 to 213.
Specifically, preset 3rd formula is：
id(k)=sin θ × iα(k)-cosθ×iβ(k)；
Preset 4th formula is：
iq(k)=cos θ × iα(k)+sinθ×iβ(k)
Wherein, iαK () is worth for α axial projections；iβK () is worth for β axial projections；Sin θ is corresponding with the phase of AC magnitude of voltage
Sine value；Cos θ are cosine value corresponding with the phase of AC magnitude of voltage；idK () is ac-side current d axle components；iq(k)
It is ac-side current q axle components.
Specifically, the 5th preset formula is：
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)
Wherein, udcchushi *K () is preset voltage values；step*For the gradient that ladder gives.
Specifically, the 6th preset formula is：
eu(k)=udc *(k)-udcmm(k)
Wherein, udcmmK () is filtered magnitude of voltage.
Specifically, the first preset formula is：
urα(k)=sin θ × ud(k)+cosθ×uq(k)；
Preset second formula is：
Vr(k)=us(k)-urα(k)
Wherein, sin θ is sine value corresponding with the phase of AC magnitude of voltage；Cos θ are the phase with AC magnitude of voltage
The corresponding cosine value in position；udK () is voltage d axle components；uqK () is voltage q axle components.
The above is the detailed description carried out to a kind of Single-phase PWM Rectifier control method for suppressing starting current, for ease of
Understand, a kind of Single-phase PWM Rectifier control method for suppressing starting current will be illustrated with a concrete application scene below,
Application examples includes：
As shown in Fig. 2 wherein usIt is AC voltage, isIt is ac-side current, udcIt is DC voltage.L is single-phase PWM
The filter inductance of rectifier, R1 is the power resistor for being connected on Single-phase PWM Rectifier, and RE1 is AC starting relay, RE2
It is DC side load-relay, C is DC voltage Support Capacitor, and S1~S4 is four power switch of full bridge inverter
Pipe.
Knowable to the operation principle of Single-phase PWM Rectifier, the control targe of Single-phase PWM Rectifier has those skilled in the art
Two：One is DC voltage is remained constant all the time, and two is ac-side current is realized sineization, and runs on unit power
Under factor running status.In addition, in engineer applied, technical staff generally wish Single-phase PWM Rectifier system can have compared with
Fast adjustment process and less overshoot electric current.And above-mentioned two engine request can not be taken into account simultaneously.What the present invention was provided
A kind of Single-phase PWM Rectifier control method that can effectively suppress starting current can effectively suppress the impact electricity in start-up course
Stream, runaway current and overshoot electric current, and possess and adjust process faster.
Understand the Single-phase PWM Rectifier control that can effectively suppress starting current provided by the present invention for convenience of technical staff
Method processed.It is as shown in Figure 4 based on the single-phase PWM rectification control method program flow diagram for effectively suppressing starting current.
As shown in figure 4, controller initialization after, it is necessary to AC starting relay RE1 open, make filter inductance L and
Power resistor R1 connects, ac-side current isEffectively limited.Treat DC voltage udcReach AC voltage peak uspeak
When, AC starting relay RE1 closures.Due to the voltage DC side voltage u on DC side Support Capacitor CdcCarried
Rise, so when AC starting relay RE1 closes moment, the dash current in main circuit will be than not applying any braking measure
Dash current reduce one times, or even less.
Control algolithm of the invention is as shown in figure 3, AC voltage usObtained by Second Order Generalized Integrator phaselocked loop computing
Go out the phase angle theta and its corresponding sine value sin θ and cosine value cos θ of the controlling cycle.
To the virtual current component of actual current phase difference-pi/2 in monophase system construction and single-phase circuit.Form two-phase just
Hand over the ac-side current α components i under α β coordinate systemsα(k) and ac-side current β components iβK (), obtains：
Ac-side current α components i under α β coordinate systems orthogonal to two-phaseα(k) and ac-side current β components iβK () uses dq
Transform (2), obtains：
The present invention is using traditional double loop control based on the Three-Phase PWM Rectifier under dq coordinate systems, but this hair
It is bright to be different from traditional algorithm.Focus on the stability of consideration system due to traditional algorithm, without the excessive dynamic for considering system
Process.Regrettably, dynamic process often has relation with system power and voltage.If do not taken in, system will be produced
Excessive overshoot electric current and produced dash current when starting, for maintain system can normal work, technical staff certainly will
Increase the allowance of system, that is to say, that cost and volume are also required to corresponding increase.Emphasis is considered single-phase PWM rectification by the present invention
Device is starting to the process up to stabilization.
In the present invention, DC voltage gives udc *Ladder it is given such as formula (3)：
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn) (3)
Wherein, step*It is the gradient of ladder given algorithm.
DC voltage udcNeed to be drawn to carry out computing in the digital second order trapper of 100Hz by natural frequency
udcnotchK the treatment of () is again udcnotchK () carries out median average filter treatment.
Natural frequency is the digital second order trapper formula such as formula (4) of 100Hz：
udcnotch(k)=udc(k)+(0.01256Ts-2)udc(k-1)+(+394384Ts 2
+1-0.01256Ts)udc(k-2)+(2-125.6Ts)udcnotch(k-1)+
(125.6Ts-394384Ts 2-1)udcnotch(k-2) (4)
The treatment of median average filter is such as formula (5)：
Inner ring deviation is calculated eu(k)=udc *(k)-udcmmK (), electric current is calculated using outer shroud PI digitial controllers
Inner ring d shaft currents give.If but the output is not filtered and limited, it will cause current inner loop d shaft currents to give line
Ripple is larger and it is possible that main circuit is difficult to the given value of current for bearing.Those skilled in the art suitably would generally adjust PI parameters
It is small to be given with reducing current inner loop d shaft currents, but this way is can not fundamentally to take into account fast in inner ring control process
Speed and stability.The present invention by apply the amplitude limit link of appropriate frequency low pass filter and appropriate threshold value in the link come
Suppress the high current phenomenon caused by the output of outer shroud PI digitial controllers is excessive.
The selection of the cut-off frequency of low pass filter needs to be compromised according to side circuit and selects, cut-off frequency set it is too low then
Regulating the speed for outer voltage can be influenceed, and cut-off frequency too high can then make wave filter export outer shroud PI digitial controllers
Filter effect is deteriorated.
The setting of the threshold value of amplitude limit link is also required to be selected according to the power trade-offs of side circuit, and threshold value setting is too low will
Rectifier power is caused to be restricted, and threshold value too high sets and the effect for suppressing super-high-current will be caused to be deteriorated.
Detailed engineering construction is described below：
Step 1：Connected using power resistor R1 and inductance L, Single-phase PWM Rectifier is operated in uncontrollable rectification state,
Rectifier DC side voltage UdcNaturally AC voltage peak U is arrived in liftings-peak；
Step 2：Treat DC voltage UdcAfter reaching alternating voltage peak, starting relay RE1 is closed, make power resistor R1
Short circuit, while controller is using following control methods control Single-phase PWM Rectifiers, makes rectifier DC side voltage UdcProgressively carry
It is raised to set-point；
Described control method is as follows：
The first step, by AC voltage detecting link, ac-side current detection and DC voltage detection
Gather the AC magnitude of voltage u at current times(k), ac-side current value is(k), DC voltage value udc(k)；
Second step, makes ac-side current value isK () is projection value i of the ac-side current on α axlesα(k), i.e. is(k)=iα
(k), and construct projection value i of the ac-side current on β axlesβ(k), i.e. iβ(k)=is(k-π/2)；
3rd step, using Second Order Generalized Integrator phaselocked loop, calculates the phase theta and its correspondence of the moment AC voltage
Sine value and cosine value；
4th step, current time ac-side current d axle component i is calculated by following equationd(k) and AC electricity
Stream q axle components iq(k)；
id(k)=sin θ × iα(k)-cosθ×iβ(k) and iq(k)=cos θ × iα(k)+sinθ×iβ(k)；
5th step, current time DC voltage value udcK () enters trap frequency in the digital second order trapper of 100Hz
Carry out computing and draw udcnotch(k)；
6th step, to udcnotchK () carries out the impulse disturbances during median average filter filters sampling process, draw udcmm
(k)；
7th step, DC voltage set-point udc *K () rises from initial value to final value in ladder, it is u that ladder rises formuladc *
(t)=udcchushi *(t)+step*(t-t1)+step*(t-t2)+...+step*(t-tn), step*For the gradient that ladder gives；
8th step, it is e to make DC voltage outer shroud deviationu(k)=udc *(k)-udcmm(k)；
9th step, DC voltage outer shroud deviation euK () enters outer voltage PI digitial controllers；
Tenth step, the output valve i of outer voltage PI digitial controllersd *K () enters into outer voltage low-pass first order filter
Row filtering operation；
11st step, the output valve i of outer voltage low-pass first order filterdLPF *K () enters given value of current amplitude limit link, on
If it is i to state linkdLPF *(k)>idLPFmax, then idLPF *(k)=idLPFmax；Otherwise, i is judgeddLPF *(k) ＜ idLPFminIf, idLPF *
(k)=idLPFmin, otherwise, export idLPF *(k)；
12nd step, by idLPF *K () is converted into given value of current output valve idLPFlim *(k), and by idLPFlim *(k) with exchange
Side electric current d axle components idK () carries out deviation and calculates electric current d axle deviations eid(k), i.e. eid(k)=idLPFlim *(k)-is(k)；
13rd step, ac-side current q axles are given as 0, and with ac-side current value iqK () carries out deviation and calculates electricity
Stream q axle deviations eiq(k), i.e. eiq(k)=- iq(k)；
14th step, electric current d axle deviations eid(k) and electric current q axle deviations eiqK () respectively enters PI digitial controller computings
U is drawn respectivelyd(k) and uq(k)；
15th step, u is calculated by following equationrα(k), urα(k)=sin θ × ud(k)+cosθ×uq(k)；
16th step, rectifier desired output VrK () passes through formula Vr(k)=us(k)-urαK () calculates；
17th step, rectifier desired output VrK () realizes the output driving arteries and veins of four switching tubes of rectifier by modulation
Punching；
Step 3：Closure load-relay RE2, accesses load, is controlled with load state according to the algorithm described in step 2
Single-phase PWM Rectifier.
According to a kind of Single-phase PWM Rectifier control method that can effectively suppress starting current of above-described embodiment, can
Effectively suppress the dash current caused by starting moment.During thus the present invention is especially suitable for applying to engineer applied.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to preceding
Embodiment is stated to be described in detail the present invention, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these
Modification is replaced, and does not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (10)
1. it is a kind of suppress starting current Single-phase PWM Rectifier control method, it is characterised in that including：
S1：Ac-side current value, AC magnitude of voltage and the DC voltage value at current time are got, to AC electricity
Flow valuve and the AC magnitude of voltage enter line translation and are calculated ac-side current d axles component and ac-side current q axle components；
S2：Rejection frequency signal operation and the operation of median average filter are carried out to the DC voltage value, after being filtered
Magnitude of voltage, and get preset step voltage values, the preset step voltage values and the filtered magnitude of voltage are carried out
It is calculated DC voltage outer shroud deviation；
S3：Operation and filtering operation are adjusted to the DC voltage outer shroud deviation, current output value are obtained, by amplitude limit
Whether link judges the current output value more than preset current maximum, if being more than, by the value of the preset current maximum
The current output value is assigned, if being not more than, whether the current output value is judged less than preset current minimum value, if the electricity
Stream output valve is less than preset current minimum value, the current output value is assigned by the value of the preset current minimum value, if described
Current output value is not less than preset current minimum value, exports the current output value；
S4：The current output value is converted into given value of current value, to the given value of current value and the ac-side current d axles point
Amount carries out deviation and is calculated electric current d axle deviations, and carrying out deviation to the ac-side current q axles component is calculated electric current q axles
Deviation, and the electric current d axles deviation, the q axles component are respectively calculated by PI digitial controllers obtain voltage d axles point
Amount and voltage q axle components；
S5：The voltage d axles component, the voltage q axle components are counted by preset first formula and preset second formula
Calculation obtains rectifier desired output, and the rectifier desired output is carried out into the output drive that SPWM modulation obtains rectifier switch pipe
Moving pulse.
2. it is according to claim 1 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
Get ac-side current value, AC magnitude of voltage and the DC voltage value at current time, to the ac-side current value and
The AC magnitude of voltage is gone back before entering line translation and being calculated ac-side current d axles component and ac-side current q axle components
Including：
The power resistor of AC and inductance are connected, after rectifier DC side voltage increase to AC voltage peak, is closed
Close starting relay and cause power resistor short circuit, then perform S1.
3. it is according to claim 2 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
The voltage d axles component, the voltage q axles component be calculated by preset first formula and preset second formula whole
Stream device desired output, by the rectifier desired output carry out SPWM modulation obtain rectifier switch pipe output driving pulse it
Also include afterwards：
The load-relay for closing DC side causes that load accesses direct current lateral circuit, and re-executes S1 to S5.
4. it is according to claim 1 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
Get ac-side current value, AC magnitude of voltage and the DC voltage value at current time, to the ac-side current value and
The AC magnitude of voltage enters line translation and is calculated ac-side current d axles component and ac-side current q axle components are specifically wrapped
Include：
After ac-side current value, AC magnitude of voltage and the DC voltage value for getting current time, by the AC
Current value is projected on α axles and β axles, obtains α axial projections value and β axial projections value；
The AC magnitude of voltage is carried out by Second Order Generalized Integrator phaselocked loop be calculated the AC magnitude of voltage
Phase and sine value corresponding with the phase of the AC magnitude of voltage and cosine value；
The α axial projections are worth by preset 3rd formula and preset 4th formula, the β axial projections value and with the AC
The corresponding sine value of phase and cosine value of magnitude of voltage carry out being calculated ac-side current d axles component and ac-side current q axles
Component.
5. it is according to claim 4 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
Rejection frequency signal operation and the operation of median average filter are carried out to the DC voltage value, filtered voltage is obtained
Value, and preset step voltage values are got, the preset step voltage values and the filtered magnitude of voltage are calculated
Specifically included to DC voltage outer shroud deviation：
By trap frequency for the digital second order trapper of 100Hz carries out being calculated rejection frequency to the DC voltage value
Magnitude of voltage afterwards；
The operation of median average filter is carried out to the magnitude of voltage after the rejection frequency and obtains filtered magnitude of voltage；
Preset voltage values are got, the preset voltage values are carried out to be calculated preset stepped-up voltage by preset 5th formula
Value；
The preset step voltage values and the filtered magnitude of voltage are carried out being calculated direct current by preset 6th formula
Side outer voltage deviation.
6. it is according to claim 5 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that to institute
State DC voltage outer shroud deviation and be adjusted operation and filtering operation, obtain current output value, institute is judged by amplitude limit link
Whether current output value is stated more than preset current maximum, if being more than, the electricity is assigned by the value of the preset current maximum
Whether stream output valve, if being not more than, judge the current output value less than preset current minimum value, if the current output value is small
In preset current minimum value, the current output value is assigned by the value of the preset current minimum value, if the current output value
Not less than preset current minimum value, export the current output value and specifically include：
After outer voltage PI digitial controllers are adjusted being calculated regulation to the DC voltage outer shroud deviation
Current output value；
It is filtered that to be calculated electric current defeated to the current output value after the regulation by outer voltage low-pass first order filter
Go out value；
Whether the current output value is judged more than preset current maximum by amplitude limit link, if being more than, by the preset electricity
Whether less than preset current most the value for flowing maximum assigns the current output value, if being not more than, judge the current output value
Small value, if the current output value is less than preset current minimum value, the electric current is assigned by the value of the preset current minimum value
Output valve, if the current output value is not less than preset current minimum value, exports the current output value.
7. it is according to claim 4 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
Preset 3rd formula is：
id(k)=sin θ × iα(k)-cosθ×iβ(k)；
Preset 4th formula is：
iq(k)=cos θ × iα(k)+sinθ×iβ(k)
Wherein, iαK () is worth for α axial projections；iβK () is worth for β axial projections；Sin θ be it is corresponding with the phase of AC magnitude of voltage just
String value；Cos θ are cosine value corresponding with the phase of AC magnitude of voltage；idK () is ac-side current d axle components；iqK () is friendship
Stream side electric current q axle components.
8. it is according to claim 5 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
5th preset formula is：
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)
Wherein, udcchushi *K () is preset voltage values；step*For the gradient that ladder gives.
9. it is according to claim 5 suppress starting current Single-phase PWM Rectifier control method, it is characterised in that it is described
6th preset formula is：
eu(k)=udc *(k)-udcmm(k)
Wherein, udcmmK () is filtered magnitude of voltage.
10. the Single-phase PWM Rectifier control method of the suppression starting current according to claim 7 to 9 any one, it is special
Levy and be, the first preset formula is：
urα(k)=sin θ × ud(k)+cosθ×uq(k)；
Preset second formula is：
Vr(k)=us(k)-urα(k)
Wherein, sin θ is sine value corresponding with the phase of AC magnitude of voltage；Cos θ are the phase pair with AC magnitude of voltage
The cosine value answered；udK () is voltage d axle components；uqK () is voltage q axle components.
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| CN108667322A (en) * | 2018-05-24 | 2018-10-16 | 中车青岛四方车辆研究所有限公司 | single-phase rectifier control method and system |
| CN111564982A (en) * | 2020-06-01 | 2020-08-21 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN110557037B (en) * | 2019-09-11 | 2021-03-23 | 广西电网有限责任公司电力科学研究院 | Direct current control method of single-phase PWM rectifier |
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| CN111564982A (en) * | 2020-06-01 | 2020-08-21 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
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