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CN106787851B - A single-phase PWM rectifier control method for suppressing starting current - Google Patents

A single-phase PWM rectifier control method for suppressing starting current Download PDF

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Publication number
CN106787851B
CN106787851B CN201611265068.8A CN201611265068A CN106787851B CN 106787851 B CN106787851 B CN 106787851B CN 201611265068 A CN201611265068 A CN 201611265068A CN 106787851 B CN106787851 B CN 106787851B
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China
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value
current
preset
voltage
voltage value
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CN106787851A (en
Inventor
唐雄民
方亦超
张俊辉
赖成靖
张淼
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The embodiment of the invention discloses a kind of Single-phase PWM Rectifier control method for inhibiting starting current, the embodiment of the present invention is connected by using inductance with power resistor first inhibits dash current output, and rectifier DC voltage is made to reach alternating current voltage crest；Then by starting relay short-circuit power resistance, and controlling rectifier using the method that outer voltage ladder gives by digitial controller makes DC voltage reach setting value；The amplitude limit link of appropriate cutoff frequency is added finally by outer voltage output low-pass filter and appropriate limiting threshold carrys out the size of limiting starting current.Have starting current small using the Single-phase PWM Rectifier of this control method, rapidity quite and the comparable characteristic of robustness, with preferable engineering application value.

Description

A kind of Single-phase PWM Rectifier control method inhibiting starting current
Technical field
The present invention relates to bidirectional energy feedback function power electronics field more particularly to a kind of inhibition starting The Single-phase PWM Rectifier control method of electric current.
Background technique
With development of modern industry, the extensive use of power electronic equipment and nonlinear load produces a large amount of harmonic wave, Harmonic Current in Power System ingredient is caused to increase rapidly, current waveform distortion increases the loss of line loss and electrical equipment, is System power factor drastically reduces, and seriously affects grid power quality.
Since PWM rectifier can be realized current on line side sine 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.
Currently, dash current caused by Single-phase PWM Rectifier start-up course and runaway current are all very big.If be not added To inhibit or solve, the switching tube and inductance of main circuit must just choose the model for being able to bear more high current, this is bound to It will increase the volume and cost of rectifier.If control method appropriate can be taken to reduce the impact occurred in start-up course Electric current and runaway current, the margin of power that can not only reduce rectifier can also improve the reliability of system.
Summary of the invention
The embodiment of the invention provides a kind of Single-phase PWM Rectifier control methods for inhibiting starting current, can significantly drop Generated dash current and the runaway current due to caused by ovennodulation and press down significantly in low Single-phase PWM Rectifier start-up course Generated overshoot electric current in Single-phase PWM Rectifier adjustment process processed.
The embodiment of the invention provides a kind of Single-phase PWM Rectifier control methods for inhibiting starting current, comprising:
S1: ac-side current value, exchange side voltage value and the DC voltage value at current time are got, to the exchange Side current value is converted and is calculated ac-side current d axis component and ac-side current q axis with the side voltage value that exchanges Component；
S2: rejection frequency signal operation is carried out to the DC voltage value and median average filter operates, is filtered Voltage value after wave, and preset step voltage values are got, to the preset step voltage values and the filtered voltage value It carries out that DC voltage outer ring deviation is calculated；
S3: operation and filtering operation are adjusted to the DC voltage outer ring deviation, current output value is obtained, passes through Amplitude limit link judges whether the current output value is greater than preset current maximum value, if more than by the preset current maximum value Value assign the current output value and judge whether the current output value is less than preset current minimum value if being not more than, if institute Current output value is stated less than preset current minimum value, assigns the value of the preset current minimum value to the current output value, if The current output value is not less than preset current minimum value, exports the current output value；
S4: being converted to given value of current value for the current output value, to the given value of current value and the ac-side current d Axis component carries out deviation and electric current d axis deviation is calculated, and carries out deviation to the ac-side current q axis component and electric current is calculated Q axis deviation, and the electric current d axis deviation, the q axis component are respectively calculated to obtain voltage d by PI digitial controller Axis component and voltage q axis component；
S5: by preset first formula and preset second formula to the voltage d axis component, the voltage q axis component into Rectifier desired output is calculated in row, modulates rectifier desired output progress SPWM to obtain the defeated of rectifier switch pipe Driving pulse out.
Preferably, the ac-side current value for getting current time, exchange side voltage value and DC voltage value are right The ac-side current value with it is described exchange side voltage value converted be calculated ac-side current d axis component with exchange side Before electric current q axis component further include:
Power resistor and the inductance series connection that side will be exchanged, the voltage increase extremely exchange side voltage peak in rectifier DC side Afterwards, it is short-circuit to make power resistor for closure starting relay, then executes S1.
Preferably, it is described by preset first formula and preset second formula to the voltage d axis component, the voltage q Axis component carries out that rectifier desired output is calculated, and modulates the rectifier desired output progress SPWM to obtain rectifier and open After the output driving pulse for closing pipe further include:
The load-relay of closure DC side makes load access direct current lateral circuit, and re-executes S1 to S5.
Preferably, the ac-side current value for getting current time, exchange side voltage value and DC voltage value are right The ac-side current value with it is described exchange side voltage value converted be calculated ac-side current d axis component with exchange side Electric current q axis component specifically includes:
After ac-side current value, exchange side voltage value and the DC voltage value for getting current time, by the friendship Stream side current value is projected on α axis and β axis, obtains α axial projection value and β axial projection value；
Exchange side voltage value is carried out by Second Order Generalized Integrator phaselocked loop exchange side voltage is calculated The phase of value and sine value corresponding with the exchange phase of side voltage value and cosine value；
By preset third formula and preset 4th formula to α axial projection value, β axial projection value and with the friendship The corresponding sine value of phase and cosine value for flowing side voltage value carry out that ac-side current d axis component and ac-side current is calculated Q axis component.
Preferably, described that rejection frequency signal operation and median average filter behaviour are carried out to the DC voltage value Make, filtered voltage value is obtained, and get preset step voltage values, after the preset step voltage values and the filtering Voltage value carry out DC voltage outer ring deviation is calculated and specifically include:
The DC voltage value be calculated filtering out by the digital second order trapper that trap frequency is 100Hz Voltage value after frequency；
Median average filter is carried out to the voltage value after the rejection frequency to operate to obtain filtered voltage value；
Preset voltage values are got, the preset voltage values are carried out preset ladder is calculated by preset 5th formula Voltage value；
The preset step voltage values and the filtered voltage value are calculated by preset 6th formula DC voltage outer ring deviation.
Preferably, described that operation and filtering operation are adjusted to the DC voltage outer ring deviation, it is defeated to obtain electric current It is worth out, judges whether the current output value is greater than preset current maximum value by amplitude limit link, if more than by the preset electricity The value of stream maximum value assigns the current output value and judges whether the current output value is less than preset current most if being not more than Small value assigns the value of the preset current minimum value to the electric current if the current output value is less than preset current minimum value Output valve exports the current output value and specifically includes if the current output value is not less than preset current minimum value:
The DC voltage outer ring deviation is adjusted by outer voltage PI digitial controller, adjusting is calculated Current output value afterwards；
The current output value after the adjusting is filtered by outer voltage low-pass first order filter, electricity is calculated Flow output valve；
Judge whether the current output value is greater than preset current maximum value by amplitude limit link, if more than will be described pre- The value for setting current maxima assigns the current output value and judges whether the current output value is less than preset electricity if being not more than Minimum value is flowed, if the current output value is less than preset current minimum value, described in the value imparting by the preset current minimum value Current output value exports the current output value if the current output value is not less than preset current minimum value.
Preferably, the preset third formula are as follows:
id(k)=sin θ × iα(k)-cosθ×iβ(k)；
Preset 4th formula are as follows:
iq(k)=cos θ × iα(k)+sinθ×iβ(k)
Wherein, iαIt (k) is α axial projection value；iβIt (k) is β axial projection value；Sin θ is corresponding with the exchange phase of side voltage value Sine value；Cos θ is cosine value corresponding with the exchange phase of side voltage value；idIt (k) is ac-side current d axis component；iq(k) For ac-side current q axis component.
Preferably, the 5th preset formula are as follows:
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)
Wherein, udcchushi *It (k) is preset voltage values；step*The gradient given for ladder.
Preferably, the 6th preset formula are as follows:
eu(k)=udc *(k)-udcmm(k)
Wherein, udcmmIt (k) is filtered voltage value.
Preferably, the described first preset formula are as follows:
urα(k)=sin θ × ud(k)+cosθ×uq(k)；
Preset second formula are as follows:
Vr(k)=us(k)-urα(k)
Wherein, sin θ is sine value corresponding with the exchange phase of side voltage value；Cos θ is and the phase that exchanges side voltage value The corresponding cosine value in position；udIt (k) is voltage d axis component；uqIt (k) is voltage q axis component.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
Include: S1 the embodiment of the invention provides a kind of Single-phase PWM Rectifier control method for inhibiting starting current: obtaining Ac-side current value, exchange side voltage value and DC voltage value to current time, to the ac-side current value and described Exchange side voltage value is converted and is calculated ac-side current d axis component and ac-side current q axis component；S2: to described DC voltage value carries out rejection frequency signal operation and the operation of median average filter, obtains filtered voltage value, and obtain Preset step voltage values are got, the preset step voltage values and the filtered voltage value are carried out that DC side is calculated Outer voltage deviation；S3: being adjusted operation and filtering operation to the DC voltage outer ring deviation, obtains electric current output Value, judges whether the current output value is greater than preset current maximum value by amplitude limit link, if more than by the preset current The value of maximum value assigns the current output value, if being not more than, judges whether the current output value is less than preset current minimum It is defeated to assign the value of the preset current minimum value to the electric current if the current output value is less than preset current minimum value for value It is worth out, if the current output value is not less than preset current minimum value, exports the current output value；S4: the electric current is defeated Value is converted to given value of current value out, carries out deviation to the given value of current value and the ac-side current d axis component and is calculated Electric current d axis deviation carries out deviation to the ac-side current q axis component and electric current q axis deviation is calculated, and controlled by PI number Device processed is respectively calculated to obtain voltage d axis component and voltage q axis component to the electric current d axis deviation, the q axis component；S5: The voltage d axis component, the voltage q axis component be calculated by preset first formula and preset second formula whole Device desired output is flowed, modulates rectifier desired output progress SPWM to obtain the output driving pulse of rectifier switch pipe.
The embodiment of the present invention is connected by using inductance with power resistor first inhibits dash current output, 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 ring ladder makes DC voltage reach setting value；It is added finally by outer voltage output suitable When the low-pass filter of cutoff frequency and the amplitude limit link of appropriate limiting threshold carry out the size of limiting starting current.The present invention is implemented Generated dash current and the electricity out of control due to caused by ovennodulation in Single-phase PWM Rectifier start-up course can be greatly lowered in example Generated overshoot electric current in stream and significantly inhibition Single-phase PWM Rectifier adjustment process, and using the single-phase of this control method PWM rectifier has starting current small, rapidity quite and the comparable characteristic of robustness, with preferable engineering application value.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of process of Single-phase PWM Rectifier control method for inhibiting 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 inhibiting starting current；
Fig. 3 is the embodiment schematic diagram of control algolithm；
Fig. 4 is to rectify control method program flow diagram based on effective single-phase PWM for inhibiting starting current.
Specific embodiment
The embodiment of the invention provides a kind of Single-phase PWM Rectifier control methods for inhibiting starting current, can significantly drop Generated dash current and the runaway current due to caused by ovennodulation and press down significantly in low Single-phase PWM Rectifier start-up course Generated overshoot electric current in Single-phase PWM Rectifier adjustment process processed.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention Range.
Referring to Fig. 1, a kind of Single-phase PWM Rectifier control method for inhibiting starting current provided in an embodiment of the present invention One embodiment, comprising:
101, ac-side current value, exchange side voltage value and the DC voltage value for getting current time, to exchange side Current value is converted and is calculated ac-side current d axis component and ac-side current q axis component with side voltage value is exchanged；
102, rejection frequency signal operation is carried out to DC voltage value and median average filter operates, after obtaining filtering Voltage value, and get preset step voltage values, preset step voltage values and filtered voltage value be calculated DC voltage outer ring deviation；
103, operation and filtering operation are adjusted to DC voltage outer ring deviation, obtain current output value, pass through limit Width link judges whether current output value is greater than preset current maximum value, if more than the value of preset current maximum value is assigned to electricity It flows output valve and judges whether current output value is less than preset current minimum value if being not more than, if current output value is less than preset electricity Minimum value is flowed, assigns the value of preset current minimum value to current output value, if current output value is not less than preset current minimum value, Export current output value；
104, current output value is converted into given value of current value, given value of current value and ac-side current d axis component is carried out Electric current d axis deviation is calculated in deviation, carries out deviation to ac-side current q axis component and electric current q axis deviation is calculated, and pass through PI digitial controller is respectively calculated electric current d axis deviation, q axis component to obtain voltage d axis component and voltage q axis component；
105, voltage d axis component, voltage q axis component calculate by preset first formula and preset second formula To rectifier desired output, modulate rectifier desired output progress SPWM to obtain the output driving pulse of rectifier switch pipe.
A kind of another implementation of Single-phase PWM Rectifier control method inhibiting starting current provided in an embodiment of the present invention Example, comprising:
201, the power resistor for exchanging side and inductance are connected, the voltage increase extremely exchange side Voltage Peak in rectifier DC side After value, closure starting relay makes power resistor short-circuit, and executes 202；
202, it after ac-side current value, exchange side voltage value and the DC voltage value for getting current time, will hand over Stream side current value is projected on α axis and β axis, obtains α axial projection value and β axial projection value；
203, exchange side voltage value is carried out by Second Order Generalized Integrator phaselocked loop that exchange side voltage value is calculated Phase and sine value corresponding with the exchange phase of side voltage value and cosine value；
204, by preset third formula and preset 4th formula to α axial projection value, β axial projection value and with exchange side voltage The corresponding sine value of the phase of value and cosine value carry out that ac-side current d axis component and ac-side current q axis component is calculated；
205, DC voltage value be calculated filtering out by the digital second order trapper that trap frequency is 100Hz Voltage value after frequency；
206, median average filter is carried out to the voltage value after rejection frequency to operate to obtain filtered voltage value；
207, preset voltage values are got, preset voltage values are carried out preset ladder is calculated by preset 5th formula Voltage value；
208, preset step voltage values and filtered voltage value are carried out that direct current is calculated by preset 6th formula Side outer voltage deviation；
209, DC voltage outer ring deviation is adjusted by outer voltage PI digitial controller and adjusting is calculated Current output value afterwards；
210, the current output value after adjusting is filtered by outer voltage low-pass first order filter and electricity is calculated Flow output valve；
211, judge whether current output value is greater than preset current maximum value by amplitude limit link, if more than by preset electricity The value of stream maximum value assigns current output value and judges whether current output value is less than preset current minimum value if being not more than, if electric It flows output valve and is less than preset current minimum value, the value of preset current minimum value is assigned to current output value, if current output value is not Less than preset current minimum value, current output value is exported；
212, current output value is converted into given value of current value, given value of current value and ac-side current d axis component is carried out Electric current d axis deviation is calculated in deviation, carries out deviation to ac-side current q axis component and electric current q axis deviation is calculated, and pass through PI digitial controller is respectively calculated electric current d axis deviation, q axis component to obtain voltage d axis component and voltage q axis component；
213, voltage d axis component, voltage q axis component calculate by preset first formula and preset second formula To rectifier desired output, modulate rectifier desired output progress SPWM to obtain the output driving pulse of rectifier switch pipe；
214, the load-relay for being closed DC side makes load access direct current lateral circuit, and re-executes 202 to 213.
Specifically, preset third formula are as follows:
id(k)=sin θ × iα(k)-cosθ×iβ(k)；
Preset 4th formula are as follows:
iq(k)=cos θ × iα(k)+sinθ×iβ(k)
Wherein, iαIt (k) is α axial projection value；iβIt (k) is β axial projection value；Sin θ is corresponding with the exchange phase of side voltage value Sine value；Cos θ is cosine value corresponding with the exchange phase of side voltage value；idIt (k) is ac-side current d axis component；iq(k) For ac-side current q axis component.
Specifically, the 5th preset formula are as follows:
udc *(k)=udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)
Wherein, udcchushi *It (k) is preset voltage values；step*The gradient given for ladder.
Specifically, the 6th preset formula are as follows:
eu(k)=udc *(k)-udcmm(k)
Wherein, udcmmIt (k) is filtered voltage value.
Specifically, the first preset formula are as follows:
urα(k)=sin θ × ud(k)+cosθ×uq(k)；
Preset second formula are as follows:
Vr(k)=us(k)-urα(k)
Wherein, sin θ is sine value corresponding with the exchange phase of side voltage value；Cos θ is and the phase that exchanges side voltage value The corresponding cosine value in position；udIt (k) is voltage d axis component；uqIt (k) is voltage q axis component.
The above be to it is a kind of inhibit starting current Single-phase PWM Rectifier control method carry out detailed description, for convenient for Understand, a kind of Single-phase PWM Rectifier control method for inhibiting starting current will be illustrated with a concrete application scene below, Application examples includes:
As shown in Fig. 2, wherein usIt is exchange side voltage, isIt is ac-side current, udcFor DC voltage.L is single-phase PWM The filter inductance of rectifier, R1 are the power resistors for being connected on Single-phase PWM Rectifier, and RE1 is exchange side 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.
Those skilled in the art are from the working principle of Single-phase PWM Rectifier it is found that the control target of Single-phase PWM Rectifier has Two: first is that DC voltage is made to remain constant always, second is that ac-side current is made to realize sineization, and running on unit power Under factor operating status.In addition, in engineer application, technical staff generally wish Single-phase PWM Rectifier system can have compared with Fast adjustment process and lesser overshoot electric current.And above-mentioned two engine request cannot combine.It is provided by the invention A kind of Single-phase PWM Rectifier control method that can effectively inhibit starting current can effectively inhibit the impact in start-up course electric Stream, runaway current and overshoot electric current, and have faster adjustment process.
The Single-phase PWM Rectifier control provided by the present invention that can effectively inhibit starting current is understood for convenience of technical staff Method processed.It is as shown in Figure 4 based on effective single-phase PWM rectification control method program flow diagram for inhibiting starting current.
As shown in figure 4, controller initialization after, need exchange a side starting relay RE1 open, make filter inductance L with Power resistor R1 series connection, ac-side current isEffectively limited.To DC voltage udcReach exchange side voltage peak uspeak When, exchange side starting relay RE1 closure.Due to the voltage DC side voltage u on DC side Support Capacitor CdcIt has been mentioned It rises, so the dash current in main circuit will be than not applying any braking measure when exchange side starting relay RE1 is closed moment Dash current reduce one times, or even it is less.
Control algolithm of the invention is as shown in figure 3, exchange side voltage usIt is obtained by Second Order Generalized Integrator phaselocked loop operation The phase angle theta in the control period and its corresponding sine value sin θ and cosine value cos θ out.
To monophase system construction and actual current phase difference-pi/2 virtual current component in single-phase circuit.Form two-phase just Hand over the ac-side current α component i under α β coordinate systemα(k) and ac-side current β component iβ(k), it obtains:
Ac-side current α component i under α β coordinate system orthogonal to two-phaseα(k) and ac-side current β component iβ(k) dq is used Transform (2), obtains:
The present invention uses the double loop control of the Three-Phase PWM Rectifier under traditional coordinate system based on dq, but this hair It is bright to be different from traditional algorithm.Dynamic since traditional algorithm focuses on the stability of consideration system, without excessively considering system Process.Regrettably, dynamic process often has relationship with system power and voltage.If do not taken in, system will be generated Generated dash current, can work normally, technical staff is bound to when excessive overshoot electric current and starting for maintenance system Increase the allowance of system, that is to say, that cost and volume are also required to increase accordingly.Emphasis is considered single-phase PWM rectification by the present invention Device reaches stable process in starting.
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*For the gradient of ladder given algorithm.
DC voltage udcIt needs to obtain by natural frequency to carry out operation in the digital second order trapper of 100Hz udcnotch(k) processing is again udcnotch(k) processing of median average filter is carried out.
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 processing of median average filter is such as formula (5):
E is calculated in inner ring deviationu(k)=udc *(k)-udcmm(k), electric current is calculated using outer ring PI digitial controller Inner ring d shaft current is given.If however the output is not filtered and is limited, it will current inner loop d shaft current is caused to give line Wave is larger and it is possible that main circuit is difficult to the given value of current born.Those skilled in the art would generally be suitably PI parameter tune It is small given to reduce current inner loop d shaft current, however this way is fast during cannot fundamentally taking into account inner loop control Speed and stability.The present invention by apply in the link amplitude limit link of appropriate frequency low-pass filter and appropriate threshold value come Inhibit due to outer ring PI digitial controller export it is excessive caused by high current phenomenon.
The selection of the cutoff frequency of low-pass filter, which needs to be compromised according to actual circuit, to be selected, cutoff frequency setting too it is low then It will affect regulating the speed for outer voltage, and too high cutoff frequency can then make filter export outer ring PI digitial controller 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 actual circuit, and threshold value setting is too low will Rectifier power is caused to be restricted, and too high threshold value setting is deteriorated will lead to the effect for inhibiting super-high-current.
Detailed engineering construction is described below:
Step 1: it is connected using power resistor R1 and inductance L, Single-phase PWM Rectifier is made to work in uncontrollable rectification state, Rectifier DC side voltage UdcNaturally it is promoted to exchange side voltage peak Us-peak；
Step 2: to DC voltage UdcAfter reaching alternating voltage peak, it is closed starting relay RE1, makes power resistor R1 Short circuit, while controller controls Single-phase PWM Rectifier using following control methods, makes rectifier DC side voltage UdcGradually mention It is raised to given value；
The control method is as follows:
The first step passes through exchange side voltage detecting link, ac-side current detection and DC voltage detection Acquire the exchange side voltage value u at current times(k), ac-side current value is(k), DC voltage value udc(k)；
Second step enables ac-side current value isIt (k) is projection value i of the ac-side current on α axisα(k), i.e. is(k)=iα (k), and projection value i of the ac-side current on β axis is constructedβ(k), i.e. iβ(k)=is(k-π/2)；
Third step calculates the phase theta and its correspondence of moment exchange side voltage using Second Order Generalized Integrator phaselocked loop Sine value and cosine value；
Current time ac-side current d axis component i is calculated by following equation in 4th stepd(k) and exchange side is electric Flow q axis component 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 udc(k) enter in the digital second order trapper that trap frequency is 100Hz It carries out operation and obtains udcnotch(k)；
6th step, to udcnotch(k) it carries out median average filter and filters out the impulse disturbances in sampling process, obtain udcmm (k)；
7th step, DC voltage given value udc *(k) rise from initial value to final value in ladder, it is u that ladder, which rises formula,dc * (t)=udcchushi *(t)+step*(t-t1)+step*(t-t2)+...+step*(t-tn), step*The gradient given for ladder；
8th step, enabling DC voltage outer ring deviation is eu(k)=udc *(k)-udcmm(k)；
9th step, DC voltage outer ring deviation eu(k) enter outer voltage PI digitial controller；
Tenth step, the output valve i of outer voltage PI digitial controllerd *(k) enter outer voltage low-pass first order filter into Row filtering operation；
11st step, the output valve i of outer voltage low-pass first order filterdLPF *(k) enter given value of current amplitude limit link, on If stating link is idLPF *(k)>idLPFmax, then idLPF *(k)=idLPFmax；Otherwise, judge idLPF *(k) < idLPFminIf idLPF * (k)=idLPFmin, otherwise, export idLPF *(k)；
12nd step, by idLPF *(k) it is converted into given value of current output valve idLPFlim *(k), and by idLPFlim *(k) with exchange Side electric current d axis component id(k) it carries out deviation and electric current d axis deviation e is calculatedid(k), i.e. eid(k)=idLPFlim *(k)-is(k)；
13rd step, ac-side current q axis are given as 0, and with ac-side current value iq(k) it carries out deviation and electricity is calculated Flow q axis deviation eiq(k), i.e. eiq(k)=- iq(k)；
14th step, electric current d axis deviation eid(k) with electric current q axis deviation eiq(k) PI digitial controller operation is respectively enterd U is obtained respectivelyd(k) and uq(k)；
15th step calculates u by following equationrα(k), urα(k)=sin θ × ud(k)+cosθ×uq(k)；
16th step, rectifier desired output Vr(k) pass through formula Vr(k)=us(k)-urα(k) it calculates；
17th step, rectifier desired output Vr(k) the output driving arteries and veins of four switching tubes of rectifier is realized by modulation Punching；
Step 3: closure load-relay RE2, access load are controlled according to the algorithm described in step 2 under load state Single-phase PWM Rectifier.
The Single-phase PWM Rectifier control method that starting current can effectively be inhibited according to one kind of above-described embodiment, can Effectively inhibit the dash current due to caused by starting moment.Thus the present invention is very suitable to apply in engineer application.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.

Claims (10)

1.一种抑制启动电流的单相PWM整流器控制方法，其特征在于，包括：1. a single-phase PWM rectifier control method for suppressing starting current, is characterized in that, comprising: S1：获取到当前时刻的交流侧电流值、交流侧电压值和直流侧电压值，对所述交流侧电流值和所述交流侧电压值进行变换和计算得到交流侧电流d轴分量和交流侧电流q轴分量；S1: Obtain the current value of the AC side, the voltage value of the AC side and the voltage value of the DC side at the current moment, and transform and calculate the current value of the AC side and the voltage value of the AC side to obtain the d-axis component of the AC side current and the voltage value of the AC side Current q-axis component; S2：对所述直流侧电压值进行滤除频率信号操作和中位值平均滤波操作，得到滤波后的电压值，并获取到预置阶梯电压值，对所述预置阶梯电压值和所述滤波后的电压值进行计算得到直流侧电压外环偏差；S2: Perform the frequency signal filtering operation and the median value averaging filtering operation on the DC side voltage value to obtain the filtered voltage value, and obtain the preset step voltage value, and compare the preset step voltage value and the The filtered voltage value is calculated to obtain the DC side voltage outer loop deviation; S3：对所述直流侧电压外环偏差进行调节操作和滤波操作，得到电流输出值，通过限幅环节判断所述电流输出值是否大于预置电流最大值，若大于，将所述预置电流最大值的值赋予所述电流输出值，若不大于，判断所述电流输出值是否小于预置电流最小值，若所述电流输出值小于预置电流最小值，将所述预置电流最小值的值赋予所述电流输出值，若所述电流输出值不小于预置电流最小值，输出所述电流输出值；S3: Perform adjustment operations and filtering operations on the DC side voltage outer loop deviation to obtain a current output value, and determine whether the current output value is greater than the preset current maximum value through the limiter link, and if it is greater than the preset current value The value of the maximum value is assigned to the current output value. If it is not greater than that, it is judged whether the current output value is less than the preset current minimum value. If the current output value is less than the preset current minimum value, the preset current minimum value is set. The value of is given to the current output value, if the current output value is not less than the preset current minimum value, the current output value is output; S4：将所述电流输出值转换为电流给定值，对所述电流给定值和所述交流侧电流d轴分量进行偏差计算得到电流d轴偏差，对所述交流侧电流q轴分量进行偏差计算得到电流q轴偏差，并通过PI数字控制器对所述电流d轴偏差、所述q轴分量分别进行计算得到电压d轴分量和电压q轴分量；S4: Convert the current output value into a given current value, calculate the deviation between the given current value and the d-axis component of the AC side current to obtain the current d-axis deviation, and perform a calculation on the q-axis component of the AC side current. The deviation is calculated to obtain the current q-axis deviation, and the current d-axis deviation and the q-axis component are respectively calculated by the PI digital controller to obtain the voltage d-axis component and the voltage q-axis component; S5：通过预置第一公式和预置第二公式对所述电压d轴分量、所述电压q轴分量进行计算得到整流器期望输出，将所述整流器期望输出进行SPWM调制得到整流器开关管的输出驱动脉冲。S5: Calculate the voltage d-axis component and the voltage q-axis component by using the preset first formula and the preset second formula to obtain the expected output of the rectifier, and perform SPWM modulation on the expected output of the rectifier to obtain the output of the rectifier switch tube drive pulse. 2.根据权利要求1所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述获取到当前时刻的交流侧电流值、交流侧电压值和直流侧电压值，对所述交流侧电流值和所述交流侧电压值进行变换和计算得到交流侧电流d轴分量和交流侧电流q轴分量之前还包括：2 . The single-phase PWM rectifier control method for suppressing starting current according to claim 1 , wherein, the AC side current value, the AC side voltage value and the DC side voltage value obtained at the current moment are obtained, and the AC side current value, the AC side voltage value and the DC side voltage value are obtained. 2 . Before converting and calculating the side current value and the AC side voltage value to obtain the d-axis component of the AC side current and the q-axis component of the AC side current, it also includes: 将交流侧的功率电阻和电感串联，在整流器直流侧电压提升至交流侧电压峰值后，闭合启动继电器使得功率电阻短路，再执行S1。Connect the power resistor and the inductor on the AC side in series, after the DC side voltage of the rectifier rises to the peak value of the AC side voltage, close the starter relay to short-circuit the power resistor, and then execute S1. 3.根据权利要求2所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述通过预置第一公式和预置第二公式对所述电压d轴分量、所述电压q轴分量进行计算得到整流器期望输出，将所述整流器期望输出进行SPWM调制得到整流器开关管的输出驱动脉冲之后还包括：3 . The single-phase PWM rectifier control method for suppressing starting current according to claim 2 , wherein the voltage d-axis component, the voltage q are controlled by the preset first formula and the preset second formula. The shaft component is calculated to obtain the expected output of the rectifier, and after performing SPWM modulation on the expected output of the rectifier to obtain the output driving pulse of the switch tube of the rectifier, it further includes: 闭合直流侧的负载继电器使得负载接入直流侧电路，并重新执行S1至S5。Close the load relay on the DC side so that the load is connected to the DC side circuit, and execute S1 to S5 again. 4.根据权利要求1所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述获取到当前时刻的交流侧电流值、交流侧电压值和直流侧电压值，对所述交流侧电流值和所述交流侧电压值进行变换和计算得到交流侧电流d轴分量和交流侧电流q轴分量具体包括：4 . The single-phase PWM rectifier control method for suppressing starting current according to claim 1 , wherein, the AC side current value, the AC side voltage value and the DC side voltage value obtained at the current moment are obtained, and the AC side current value, the AC side voltage value and the DC side voltage value are obtained. The side current value and the AC side voltage value are transformed and calculated to obtain the d-axis component of the AC side current and the q-axis component of the AC side current specifically including: 在获取到当前时刻的交流侧电流值、交流侧电压值和直流侧电压值后，将所述交流侧电流值投影在α轴和β轴上，得到α轴投影值和β轴投影值；After acquiring the AC side current value, the AC side voltage value and the DC side voltage value at the current moment, project the AC side current value on the α axis and the β axis to obtain the α axis projection value and the β axis projection value; 通过二阶广义积分器锁相环对所述交流侧电压值进行计算得到所述交流侧电压值的相位以及与所述交流侧电压值的相位对应的正弦值和余弦值；Calculate the AC side voltage value through a second-order generalized integrator phase-locked loop to obtain the phase of the AC side voltage value and the sine and cosine values corresponding to the phase of the AC side voltage value; 通过预置第三公式和预置第四公式对所述α轴投影值、所述β轴投影值和与所述交流侧电压值的相位对应的正弦值和余弦值进行计算得到交流侧电流d轴分量和交流侧电流q轴分量。The AC side current d is obtained by calculating the α-axis projection value, the β-axis projection value, and the sine and cosine values corresponding to the phase of the AC side voltage value by using the preset third formula and the preset fourth formula axis component and q-axis component of the AC side current. 5.根据权利要求4所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述对所述直流侧电压值进行滤除频率信号操作和中位值平均滤波操作，得到滤波后的电压值，并获取到预置阶梯电压值，对所述预置阶梯电压值和所述滤波后的电压值进行计算得到直流侧电压外环偏差具体包括：5. The single-phase PWM rectifier control method for suppressing starting current according to claim 4, characterized in that, the filtering operation of frequency signal and median value averaging filtering operation are performed on the DC side voltage value, and the filtered The voltage value of the DC side voltage is obtained, and the preset step voltage value is obtained, and the DC side voltage outer loop deviation is obtained by calculating the preset step voltage value and the filtered voltage value, including: 通过陷波频率为100Hz的数字二阶陷波器对所述直流侧电压值进行计算得到滤除频率后的电压值；Calculate the voltage value of the DC side through a digital second-order notch filter with a notch frequency of 100Hz to obtain the voltage value after filtering the frequency; 对所述滤除频率后的电压值进行中位值平均滤波操作得到滤波后的电压值；Perform a median value average filtering operation on the voltage value after filtering the frequency to obtain a filtered voltage value; 获取到预置电压值，通过预置第五公式对所述预置电压值进行计算得到预置阶梯电压值；Obtaining the preset voltage value, and calculating the preset voltage value by using the preset fifth formula to obtain the preset stepped voltage value; 通过预置第六公式对所述预置阶梯电压值和所述滤波后的电压值进行计算得到直流侧电压外环偏差。The DC side voltage outer loop deviation is obtained by calculating the preset stepped voltage value and the filtered voltage value by using a preset sixth formula. 6.根据权利要求5所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，对所述直流侧电压外环偏差进行调节操作和滤波操作，得到电流输出值，通过限幅环节判断所述电流输出值是否大于预置电流最大值，若大于，将所述预置电流最大值的值赋予所述电流输出值，若不大于，判断所述电流输出值是否小于预置电流最小值，若所述电流输出值小于预置电流最小值，将所述预置电流最小值的值赋予所述电流输出值，若所述电流输出值不小于预置电流最小值，输出所述电流输出值具体包括：6. The single-phase PWM rectifier control method for suppressing starting current according to claim 5, wherein the DC side voltage outer loop deviation is adjusted and filtered to obtain the current output value, and judged by the limiter link Whether the current output value is greater than the preset current maximum value, if greater, assign the preset current maximum value to the current output value, if not greater, determine whether the current output value is less than the preset current minimum value , if the current output value is less than the preset minimum current value, assign the value of the preset current minimum value to the current output value, and if the current output value is not less than the preset current minimum value, output the current output value Values specifically include: 通过电压外环PI数字控制器对所述直流侧电压外环偏差进行调节计算得到调节后的电流输出值；The adjusted current output value is obtained by adjusting and calculating the deviation of the DC side voltage outer loop through the voltage outer loop PI digital controller; 通过电压外环一阶低通滤波器对所述调节后的电流输出值进行滤波计算得到电流输出值；The adjusted current output value is filtered and calculated by the first-order low-pass filter of the voltage outer loop to obtain the current output value; 通过限幅环节判断所述电流输出值是否大于预置电流最大值，若大于，将所述预置电流最大值的值赋予所述电流输出值，若不大于，判断所述电流输出值是否小于预置电流最小值，若所述电流输出值小于预置电流最小值，将所述预置电流最小值的值赋予所述电流输出值，若所述电流输出值不小于预置电流最小值，输出所述电流输出值。Determine whether the current output value is greater than the preset current maximum value through the limiter link. If it is greater than the preset current maximum value, assign the value of the preset current maximum value to the current output value. If not greater than, determine whether the current output value is less than The preset current minimum value, if the current output value is less than the preset current minimum value, the value of the preset current minimum value is assigned to the current output value, if the current output value is not less than the preset current minimum value, The current output value is output. 7.根据权利要求4所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述预置第三公式为：7. The single-phase PWM rectifier control method for suppressing startup current according to claim 4, wherein the preset third formula is: id(k)＝sinθ×iα(k)-cosθ×iβ(k)；i d (k)=sinθ×i α (k)-cosθ×i β (k); 所述预置第四公式为：The preset fourth formula is: iq(k)＝cosθ×iα(k)+sinθ×iβ(k)i q (k)=cosθ×i α (k)+sinθ×i β (k) 其中，iα(k)为α轴投影值；iβ(k)为β轴投影值；sinθ为与交流侧电压值的相位对应的正弦值；cosθ为与交流侧电压值的相位对应的余弦值；id(k)为交流侧电流d轴分量；iq(k)为交流侧电流q轴分量。Among them, i α (k) is the α-axis projection value; i β (k) is the β-axis projection value; sinθ is the sine value corresponding to the phase of the AC side voltage value; cosθ is the cosine value corresponding to the phase of the AC side voltage value value; i d (k) is the d-axis component of the AC side current; i q (k) is the q-axis component of the AC side current. 8.根据权利要求5所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述预置第五公式为：8. The single-phase PWM rectifier control method for suppressing startup current according to claim 5, wherein the preset fifth formula is: udc *(k)＝udcchushi *(k)+step*(k-k1)+step*(k-k2)+...+step*(k-kn)u dc * (k)=u dcchushi * (k)+step * (kk 1 )+step * (kk 2 )+...+step * (kk n ) 其中，udcchushi *(k)为预置电压值；step*为阶梯给定的梯度。Among them, u dcchushi * (k) is the preset voltage value; step * is the gradient given by the step. 9.根据权利要求5所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述预置第六公式为：9. The single-phase PWM rectifier control method for suppressing startup current according to claim 5, wherein the preset sixth formula is: eu(k)＝udc *(k)-udcmm(k)e u (k)=u dc * (k)-u dcmm (k) 其中，udcmm(k)为滤波后的电压值。Among them, u dcmm (k) is the voltage value after filtering. 10.根据权利要求7至9任意一项所述的抑制启动电流的单相PWM整流器控制方法，其特征在于，所述预置第一公式为：10. The single-phase PWM rectifier control method for suppressing starting current according to any one of claims 7 to 9, wherein the preset first formula is: urα(k)＝sinθ×ud(k)+cosθ×uq(k)；u rα (k)=sinθ×u d (k)+cosθ×u q (k); 所述预置第二公式为：The preset second formula is: Vr(k)＝us(k)-urα(k)V r (k)=us (k)-u rα ( k ) 其中，sinθ为与交流侧电压值的相位对应的正弦值；cosθ为与交流侧电压值的相位对应的余弦值；ud(k)为电压d轴分量；uq(k)为电压q轴分量。Among them, sinθ is the sine value corresponding to the phase of the AC side voltage value; cosθ is the cosine value corresponding to the phase of the AC side voltage value; ud (k) is the voltage d -axis component; u q (k) is the voltage q-axis weight.
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