CN104137409A - Voltage control device and voltage control method for power conversion device - Google Patents
Voltage control device and voltage control method for power conversion device Download PDFInfo
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- CN104137409A CN104137409A CN201380010496.4A CN201380010496A CN104137409A CN 104137409 A CN104137409 A CN 104137409A CN 201380010496 A CN201380010496 A CN 201380010496A CN 104137409 A CN104137409 A CN 104137409A
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
DC intermediate voltage increase due to external disturbance must be suppressed when a load is being controlled using a power conversion device, and a DC estimation unit is therefore provided for performing pseudo-differentiation for suppressing higher harmonics to estimate a detected voltage value after a detected DC intermediate voltage has been differentiated. Also provided is an LPF that passes DC instructions for controlling the DC intermediate voltage. The difference between the DC instruction passed through the LPF and the DC estimation value estimated by the DC estimation unit is estimated as the external disturbance value. The external disturbance value and the DC instruction are added using reversed polarity and the result is inputted to the DC controller to generate a voltage instruction. The output voltage of a power rectifier is controlled via a PWM controller.
Description
Technical field
The present invention relates to power converter dress
The voltage-operated device of putting and voltage control method, the particularly control of direct current intermediate voltage.
Background technology
Fig. 7 illustrates the main circuit structure figure of the single line performance of the power-converting device that is connected with alternating current motor.Power-converting device possesses via reactor and is connected to the CV of direct transform portion, the IV of inverse transformation portion being connected with alternating current motor M side of system voltage and is connected to the CV of direct transform portion and the capacitor C of the direct-flow intermediate circuit of the IV of inverse transformation portion.Generally, use based on carrier frequency Fc[Hz] PWM (Pulse Width Modulation: pulse width modulation), control the voltage control based on the CV of direct transform portion.
Power-converting device is transformed to direct current by interchange by the CV of direct transform portion, with direct current Io (s), capacitor C is charged on one side and by the terminal voltage Vdc[V of capacitor C] (direct current intermediate voltage) be maintained setting, by the IV of inverse transformation portion, by DC converting, be interchange on one side, control alternating current motor M.In the situation that the rotary speed as the alternating current motor M of load has changed fast due to certain reason in the control of the alternating current motor M based on power-converting device, particularly, when becoming regeneration operate condition, the regenerative current of the regenerative voltage based on occurring in alternating current motor M charges to capacitor C by the IV of inverse transformation portion, regenerative current become disturb and make direct current intermediate voltage Vdc[V] sharply rise.Therefore, there are the over-voltage protection function that arranges in power-converting device, excess current protective function action and worry that the control of alternating current motor M stops.Therefore, as the example of the such interference of inhibition, known patent document 1.
Patent documentation 1: TOHKEMY 2004-153978
Summary of the invention
As mentioned above, in hope, in the situation that load significantly changes, occur to use power-converting device in such purposes such as regeneration action, if for the uncontrollable direct current intermediate voltage of load disturbance, cannot normally use power-converting device.In addition, the in the situation that of current sensor being installed in the direct current detection in order sharply to rise in direct-flow intermediate circuit, because the difficulty that becomes is installed in the impact of the heating of current sensor etc., generation cannot realize the situation of the current detecting in direct-flow intermediate circuit.
In patent documentation 1, do not use current sensor and reduce impact for the load disturbance of direct voltage, so infer and direct current according to direct voltage, but in the gimmick of this patent documentation 1, be made as and also comprise that power-converting device has a mind to make the electric current of its action, interference is offset in the electric current vibration that occurs due to PWM, so cannot improve the gain of voltage controller.Therefore, in the purposes that requires desired value response rapidly, have problems.
The object of the present invention is to provide a kind of gain that improves voltage control mechanism and voltage-operated device and the voltage control method of the power-converting device of the improvement of realize target value response.
According to a viewpoint of the present invention, a kind of voltage-operated device of power-converting device is provided, this power-converting device possesses: direct transform device is direct current by exchange conversion; And inverse converter, DC converting is supplied with to electric power for interchange to load, capacitor, is connected with the DC circuit that direct transform device is coupled together with inverse converter; Power-converting device is configured to, according to the deviation of the detection voltage of setting voltage and DC circuit, by PI operational part, generate current-order, current-order is inputed to current control division and formation voltage instruction, according to this voltage instruction, the output voltage of controlling direct transform device via PWM control part, this voltage-operated device further comprises: LPF, passes through described current-order; Electric current estimating unit, is configured to receive described detection voltage and carries out differential, after differential, carries out being suppressed the pseudo-differential of harmonic wave and being inferred electric current from voltage by LPF; And a portion, it,, using the deviation of the output of the output of described LPF and electric current estimating unit as disturbing guess value, overlaps onto to reversed polarity described current-order.
According to other viewpoints of the present invention, described electric current estimating unit before calculating the deviation of the output of LPF and the output of electric current estimating unit, input voltage is multiplied by described DC circuit DC voltage detector detection characteristic and carry out pseudo-differential.
According to another other viewpoints of the present invention, voltage-operated device further comprises the control limiting unit of the input side that is arranged on described current control division, voltage-operated device is configured to detect to control the poor of the input side of limiting unit and the current-order between outlet side, to described PI operational part feedback difference signal, according to the deviation of described setting voltage and difference signal, carry out integral operation.
According to other viewpoints of the present invention, be included in the time constant T[sec of the LPF function in described electric current estimating unit] be set to T[sec] >=2/Fc[Hz], wherein, Fc[Hz] be the carrier frequency of described PWM control part.
According to another viewpoint of the present invention, a kind of voltage control method of power-converting device is provided, this power-converting device comprises: direct transform device is direct current by exchange conversion; Inverse converter, supplies with electric power to load by DC converting for interchange; And capacitor, be connected with the DC circuit that direct transform device is coupled together with inverse converter; Described voltage control method comprises: according to the deviation of the detection voltage of setting voltage and DC circuit, by PI operational part, generate current-order, current-order is inputed to current control division and formation voltage instruction, in response to this voltage instruction, via PWM control part, control the output voltage of direct transform device, at this voltage control method, further comprise: LPF is set, described current-order is passed through; And electric current estimating unit is set, receive described detection voltage and carry out differential, after differential, carry out suppressing the pseudo-differential of harmonic wave and voltage being speculated as to electric current by LPF, using this electric current guess value and the difference of described current-order of having passed through LPF as disturbing guess value, this interference guess value is overlapped onto to current-order and eliminates interference.
According to another other viewpoints of the present invention, described current-order being made as to Icmd (s), the output current of described PWM control part is made as to Io (s), when overlapping interference on output current Io (s) and be made as D (s), by following formula, infer described in computing and disturb guess value-D^ (s)
-D^(s)＝Icmd(s)×(1/Ts+1)-{Io(s)+D(s)}×1/Ts+1
＝-D(s)×1/Ts+1
Wherein, s is Laplacian, T[sec] be puppet each time constant while differentiating and when current-order is passed through.
According to another other viewpoints of the present invention, when the direct voltage that detects the direct current intermediate voltage of described DC circuit being detected to characteristic be made as H (s), by following formula, infer described in computing and disturb guess value-D^ (s),
-D^(s)＝Icmd(s)×{(1/Ts+1)H(s)}-{Io(s)+D(s)}×(1/Ts+1)×H(s)
＝-D(s)×(1/Ts+1)×H(s)。
According to another other viewpoints of the present invention, the direct current intermediate voltage of described DC circuit is being made as to Vdc (s), described condenser capacitance is being made as to C[F], when direct voltage is detected to characteristic and is made as H (s), utilize described electric current estimating unit to infer computing direct current by following formula
Vdc(s)×Cs/Ts+1＝1/Cs×{Io(s)+D(s)}×Cs/Ts+1
＝{Io(s)+D(s)}×1/Ts+1。
According to another other viewpoints of the present invention, be made as H (s), when DC voltage detection value is made as to Vdc-det (s), utilize described electric current estimating unit to infer computing by following formula direct voltage being detected to characteristic,
Vdc-det(s)×Cs/Ts+1＝1/Cs×{Io(s)+D(s)}×(Cs/Ts+1)×H(s)＝{Io(s)+D(s)}×(1/Ts+1)×H(s)。
Accompanying drawing explanation
Fig. 1 is the structure chart of control device that the middle dc voltage of the 1st execution mode of the present invention is shown.
Fig. 2 is the structure chart of control device that the middle dc voltage of the 2nd execution mode of the present invention is shown.
Fig. 3 is simulation result figure, is (a) that noiseless correction, (b) are situations about having based on interference correction of the present invention.
Fig. 4 is the structure chart of control device that the middle dc voltage of the 3rd execution mode of the present invention is shown.
Fig. 5 is the structure chart of control device that the middle dc voltage of the 4th execution mode of the present invention is shown.
Fig. 6 is the interference characteristic result figure that considers DC voltage detector characteristic based on having or not, and is (a) that situation, (b) that does not consider detector characteristic is the situation of having considered detector characteristic.
Fig. 7 is the structure chart of power-converting device.
Embodiment
The present invention is provided with electric current estimating unit, and this electric current estimating unit, after detected direct current intermediate voltage has carried out differential to power-converting device, suppresses the pseudo-differential of harmonic wave and detection magnitude of voltage is speculated as to current value.In addition, be provided with LPF, the current-order that this LPF is used in control direct current intermediate voltage passes through.To pass through the current-order of LPF and infer that by electric current estimating unit the departure of the electric current guess value is speculated as interference value, according to the polarity of offsetting this interference value, be added current-order, afterwards, be input to current control division and formation voltage instruction, via PWM control part, control the output voltage of direct transform device.
In addition, in the inhibitory control of direct current intermediate voltage, consider the computing of the characteristic of DC voltage detector, thereby can suppress the impact due to the interference in the frequency field of high frequency, can improve interference characteristic.Below, describe in detail with reference to the accompanying drawings.
Fig. 1 is the control circuit that the CV of direct transform portion of the 1st embodiment of the present invention is shown, and is the figure shown in the s region after Laplace transform.In subtraction portion, carry out, for the setting voltage Vdc-cmd (s) of the CV of direct transform portion and the difference operation of voltage detecting value Vdc (s), difference being input to PI operational part 1.PI operational part 1 comprises the scale operation unit 11 with proportional gain Kp and the integral unit 12 that integration time constant is made as to Ti, operation current instruction Icmd (s).The current-order Icmd (s) calculating is input to current control division 2 and computing voltage instruction Vcmd (s), according to this voltage instruction Vcmd (s), via PWM control part 3, control the CV of direct transform portion, output output current Io (s) and capacitor 4 is charged.
With output current Io (s) is added to load disturbance D (s), the electric current obtaining charges to capacitor 4, its voltage is fed back to the input side of PI operational part 1 as detecting voltage Vdc (s), thereby obtains the difference with setting voltage Vdc-cmd (s).The 5th, electric current estimating unit, input detects voltage Vdc (s) and infers current value.The 6th, LPF (Low Pass Filter: low pass filter), input current instruction Icmd (s), is exported with the departure of electric current guess value and be added to current-order Icmd (s) as interference-D^ (s) guess value.
Pass through said structure, if consider the interference D (s) when power-converting device is regenerated action,, because flowing into the energy of capacitor 4 is electric currents, so can be assumed to be interference D (s), be also electric current, this interference D (s) is overlaid output current Io (s).
In addition, if the electrostatic capacitance of capacitor 4 is made as to C[F], direct current intermediate voltage Vdc (s) can be by the performance of (1) formula.
Vdc(s)＝1/Cs{Io(s)+D(s)}＝>Vdc(s)×Cs＝Io(s)+D(s)……(1)
Wherein, 1/s is integration.
In the present invention, use this direct current intermediate voltage Vdc (s), first direct current intermediate voltage Vdc (s) is transformed to direct current, according to disturbing the state before and after occurring to infer disturbance current.
By being multiplied by condenser capacitance C differential, can carrying out direct current intermediate voltage to the conversion of direct current, but now, if directly to taking advantage of calculation value to carry out differential, produce the worry of also amplifying disturbing.Therefore, in electric current estimating unit 5, in order preventing from disturbing, to amplify, after differential, to carry out suppressing by LPF the pseudo-differential of harmonic wave.The speculating type of direct current becomes (2).
Vdc(s)×Cs/Ts+1＝1/Cs×{Io(s)+D(s)}×Cs/Ts+1
＝{Io(s)+D(s)}×1/Ts+1……(2)
Wherein, T[sec] be the time constant of LPF.
Herein, if be made as the CV of direct transform portion according to current-order Icmd (s) output current Io (s), disturb and also should become zero.Therefore,, if it is roughly consistent with output current Io (s) to be conceived to current-order Icmd (s), as long as obtain the deviation of current-order Icmd (s) and electric current guess value as shown in (3) formula, just can infers and disturb D (s).
Become Icmd (s) ≡ Io (s)=>Icmd (s) ≈ Io (s) ... (3).
That is, for the pseudo-differential in electric current estimating unit 5, apply LPF, according to (2) formula, be made as guess value, so current-order Icmd (s) also applies LPF by LPF6, by getting its deviation, only infer and disturb.By (4) formula, represent the interference-D^ (s) inferring.
-D^(s)＝Icmd(s)×(1/Ts+1)-{Io(s)+D(s)}×1/Ts+1
＝-D(s)×1/Ts+1……(4)
The guess value of the interference of obtaining by above formula is added to eliminate and is disturbed with current-order Icmd (s) the reversed polarity ground being calculated by PI operational part 1, and be input to current control division 2.
The time constant of the LPF using when next, research is carried out pseudo-differential in electric current estimating unit 5.
By 3 pairs of voltage instructions that calculated by current control division 2 of PWM control part, carry out PWM modulation.Therefore, overlappingly on direct voltage have a carrier frequency Fc[Hz] current pulsation.In the situation that adopting PWM control mode, this frequency is uncontrollable, still, in above-mentioned electric current is inferred, is unwanted.Therefore, as the decision benchmark of the time constant in electric current estimating unit 5 and be made as carrier frequency band is decayed above.Therefore,, if based on sampling thheorem, 2 times of time constant of the LPF using in pseudo-differential being made as to carrier cycle as shown in (5) formula are above.
T[sec]≥2/Fc[Hz]……(5)
According to this embodiment, even if occur, in the situation of the electric current change based on load change, also can suppress direct current intermediate voltage, can realize this voltage without using current detector and suppress, so than the example that uses as in the past current detector, can reduce device volume.In addition, can suppress voltage, thereby power-converting device can prevent the load of accompanying with the action of defencive function based on overvoltage, overcurrent, stop.
In addition, when inferring electric current according to direct current intermediate voltage, do not infer the electric current based on carrier wave, so can improve the gain of voltage control mechanism, improve desired value response.
Fig. 2 is the figure that the 2nd embodiment is shown, to the additional prosign in the position identical or suitable with Fig. 1 and the description thereof will be omitted.That is, the point different from the embodiment of Fig. 1 is to be provided with the feedback section 8 of controlling limiting unit 7 and having gain Kfb.
In power-converting device, if the current-order Icmd (s) calculating at PI operational part 1 is the upper overlapping interference value-D^ (s) that of inferring, there is the large worry of the quantitative change of control.
Usually, it is large that imagination is controlled quantitative change, in order to limit this controlled quentity controlled variable, limiting circuit is set, and controlling limiting unit 7 is exactly this limiting circuit.If by controlling limiting unit 7 restriction controlled quentity controlled variables, there is saturated (windup) phenomenon changing on the rightabout of restriction.What for fear of this phenomenon, arrange is feedback section 8.
That is, the difference according to controlling the input side of limiting unit 7 and the signal of outlet side and detect input and output is multiplied by gain Kfb in feedback section 8, is taken advantage of calculation value to feed back to PI operational part 1.In PI operational part 1, from the departure of setting voltage and detection voltage, further deduct the difference via feedback section 8 inputs, according to this difference, carry out integral operation.That is, PI operational part 1 is configured to Auto-matching PI control system, automatically adjusts, thereby suppress I action integration excessive and that cause saturated (reset windup) action to suppress the mode of I action.
Therefore, according to this embodiment, except the effect of embodiment 1, the effect of the saturated action while also thering is the restricted circuit of restraint measure.
Fig. 3 is the figure that the simulation result in the present invention is shown, and situation, (b) that (a) illustrates noiseless correction illustrates the situation of the present invention of carrying out interference correction of having applied.(b) more known of (a) by Fig. 3, size about direct current intermediate voltage Vdc (s), (b) figure is also shorter much smaller than (a) figure and time of origin, can confirm by being inferred that by the present invention the direct current has suppressed direct voltage change.
Fig. 4 is the figure that the 3rd embodiment is shown, and Fig. 5 is the figure that the 4th embodiment is shown.
In the present invention shown in Fig. 1 and Fig. 2, use power-converting device detected direct current intermediate voltage Vdc (s) and only inferred load disturbance, but in general, in the DC voltage detector for detection of direct voltage, there is dead time, frequency response, have the worry of introducing error in the high frequency band that disturbs guess value.In the embodiment of Fig. 4, Fig. 5, consider that respectively the characteristic of DC voltage detector 9,10 is inferred interference value.
In the 3rd embodiment shown in Fig. 4, to the part identical with Fig. 1 or the additional prosign of suitable part and the description thereof will be omitted.DC voltage detector 9 detects by the condenser voltage Vdc (s) shown in (1) formula, if the characteristic of DC voltage detector is made as to H (s), DC voltage detection value is made as to Vdc-det (s), becomes (6) formula.
Vdc-det(s)＝Vdc(s)×H(s) (6)
Use DC voltage detection value Vdc_det (s), according to the state before and after disturbing, infer disturbance current.First, Vdc_det (s) is transformed to direct current.In order to be transformed to direct current, to be multiplied by C and to carry out differential.But, if direct differentiation has and amplifies the worry of disturbing, so carry out suppressing by LPF the pseudo-differential of harmonic wave after differential.(7) formula illustrates the speculating type of direct current.
Vdc_det(s)×Cs/Ts+1＝1/Cs{Io(s)+D(s)}×{(Cs/Ts+1)}×H(s)
＝{Io(s)+D(s)}×(1/Ts+1)×H(s)……(7)
If the CV of direct transform portion has exported electric current I o (s) according to current-order Icmd (s), disturb and also should become zero, as long as the deviation of obtaining current instruction Icmd (s) and electric current guess value as shown in above-mentioned (3) formula, just can infer and disturb D (s).Need to before getting deviation, consider that direct voltage detects characteristic H (s) and for the LPF of pseudo-differential herein.If command value is also applied H (s) and LPF and gets deviation, can only infer interference.(8) formula illustrate infer the interference that.
-D^(s)＝Icmd(s)×{(1/Ts+1)×H(s)}-{Io(s)+D(s)}×{(1/Ts+1)×H(s)}
＝-D(s)×(1/Ts+1)×H(s)……(8)
The guess value of the interference of obtaining by above formula is added to eliminate and is disturbed with current-order Icmd (s) the reversed polarity ground calculating by PI operational part 1, and be input to current control division 2, carry out Current Control, thereby can suppress to disturb.
The 4th embodiment shown in Fig. 5 is the example of the situation of the saturated phenomenon while being applicable to avoid limiting the limit as illustrated in fig. 2, with Fig. 2 similarly, PI operational part 1 is configured to Auto-matching PI control system.
That is, according to controlling the input side of limiting unit 7 and the signal of outlet side, detect the difference of input and output, and then remove and be speculated as the interference-D^ (s) overlapping onto in this difference, afterwards, be input to feedback section 8, be multiplied by gain Kfb in feedback section 8, it takes advantage of calculation value to be fed back to PI operational part 1.In PI operational part 1, from the departure of setting voltage and detection voltage, further deduct the difference via feedback section 8 inputs, according to this difference, carry out integral operation.That is, PI operational part 1 is configured to Auto-matching PI control system, by automatically adjusting to suppress the mode of I action, suppresses the saturated action of I action integration excessive and that cause.
Fig. 6 is the simulation result figure of situation that has considered the interference characteristic of DC voltage detector, is from disturbing the frequency response till the deviation that is input to DC voltage detection value.(a) be that figure of the present invention, (b) when consideration characteristics is not shown is the figure of the present invention illustrating while having considered characteristic, known in based on (b) of the present invention figure without the frequency band that surpasses 0dB, interference characteristic muting sensitivity in the frequency field of high frequency (impact due to the interference such as detection noise is little), interference characteristic improves.
As previously discussed, according to the present invention, even there is electric current change due to reproduced state etc. in the situation that, also can suppress direct current intermediate voltage, without using current detector, can realize this voltage suppresses, so than the example that uses as in the past current detector, can reduce device volume.In addition, can suppress voltage, thereby power-converting device can prevent the load of accompanying with the action of defencive function based on overvoltage, overcurrent, stop.In addition, when inferring electric current according to direct current intermediate voltage, do not infer the electric current based on carrier wave, so can improve the gain of voltage control mechanism, the improvement of realize target value response.
In addition, in the inhibitory control of direct current intermediate voltage, consider the computing of the characteristic of DC voltage detector, thereby can suppress the impact due to the interference in the frequency field of high frequency, can improve interference characteristic.
Claims (9)
1. a voltage-operated device for power-converting device, wherein,
This power-converting device possesses: direct transform device is direct current by exchange conversion; And inverse converter, DC converting is supplied with to electric power to load for interchange, the DC circuit that direct transform device and inverse converter are coupled together is connected with to capacitor,
According to the deviation of the detection voltage of setting voltage and DC circuit, by PI operational part, generate current-order, to the instruction of current control division input current and formation voltage instruction, according to this voltage instruction, is controlled the output voltage of direct transform device via PWM control part,
Described voltage-operated device is configured to setting:
LPF, passes through described current-order; And
Electric current estimating unit, inputs described detection voltage and carries out differential, after differential, carries out suppressing the pseudo-differential of harmonic wave and voltage being speculated as to electric current by LPF,
Using the deviation of the output of the output of described LPF and electric current estimating unit as disturbing guess value, overlap onto to reversed polarity described current-order.
2. the voltage-operated device of power-converting device according to claim 1, is characterized in that,
Before the deviation that described electric current estimating unit is exported in the output of calculating LPF and electric current estimating unit, input voltage is multiplied by described DC circuit DC voltage detector detection characteristic and carry out pseudo-differential.
3. according to the voltage-operated device of the power-converting device described in claim 1 or 2, it is characterized in that,
The input side being configured at described current control division arranges control limiting unit, detect to control current-order poor of the input and output side of limiting unit, and difference signal is fed back to described PI operational part, according to the deviation of described setting voltage and difference signal, carries out integral operation.
4. according to the voltage-operated device of the power-converting device described in any one in claims 1 to 3, it is characterized in that,
The time constant T[sec of the LPF function having about described electric current estimating unit], the carrier frequency of described PWM control part is being made as to Fc[Hz] time, be T[sec] >=2/Fc[Hz].
5. a voltage control method for power-converting device, wherein,
This power-converting device possesses: direct transform device is direct current by exchange conversion; And inverse converter, DC converting is supplied with to electric power to load for interchange, the DC circuit that direct transform device and inverse converter are coupled together is connected with to capacitor,
According to voltage, set the deviation with the detection voltage of DC circuit, by PI operational part, generate current-order, to the instruction of current control division input current and formation voltage instruction, according to this voltage instruction, is controlled the output voltage of direct transform device via PWM control part,
In this voltage control method, arrange:
LPF, passes through described current-order; And
Electric current estimating unit, inputs described detection voltage and carries out differential, after differential, carries out suppressing by LPF the pseudo-differential of harmonic wave, and voltage is speculated as to electric current,
Using this electric current guess value with the difference of described current-order of having passed through LPF as disturbing guess value, and control as this interferences guess value being overlapped onto to current-order to eliminate interference.
6. the voltage control method of power-converting device according to claim 5, is characterized in that,
Described current-order is made as Icmd (s), by the output current of described PWM control part be made as Io (s), by when the upper overlapping interference of output current Io (s) is made as D (s), by following formula, infer described in computing and disturb guess value-D^ (s)
-D^(s)＝Icmd(s)×(1/Ts+1)-{Io(s)+D(s)}×1/Ts+1＝-D(s)×1/Ts+1
Wherein, s is Laplacian, T[sec] be puppet each time constant while differentiating and when current-order is passed through.
7. the voltage control method of power-converting device according to claim 6, is characterized in that,
When the direct voltage that detects the direct current intermediate voltage of described DC circuit being detected to characteristic be made as H (s), by following formula, infer described in computing and disturb guess value-D^ (s),
-D^(s)＝Icmd(s)×{(1/Ts+1)H(s)}-{Io(s)+D(s)}×(1/Ts+1)×H(s)＝-D(s)×(1/Ts+1)×H(s)。
8. according to the voltage control method of the power-converting device described in any one in claim 5 to 7, it is characterized in that,
In the supposition of the direct current in described electric current estimating unit, the direct current intermediate voltage of described DC circuit is being made as to Vdc (s), described condenser capacitance is being made as to C[F], when direct voltage is detected to characteristic and is made as H (s), by following formula, infer computing direct current
Vdc(s)×Cs/Ts+1＝{Io(s)+D(s)}×Cs/Ts+1＝{Io(s)+D(s)}×1/Ts+1。
9. the voltage control method of power-converting device according to claim 8, is characterized in that,
In the supposition of the direct current in described electric current estimating unit, be made as H (s), when DC voltage detection value is made as to Vdc-det (s), by following formula, infer computing direct voltage being detected to characteristic,
Vdc-det(s)×Cs/Ts+1＝1/Cs×{Io(s)+D(s)}×(Cs/Ts+1)×H(s)＝{Io(s)+D(s)}×(1/Ts+1)×H(s)。
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| PCT/JP2013/052180 WO2013125320A1 (en) | 2012-02-22 | 2013-01-31 | Voltage control device and voltage control method for power conversion device |
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| CN104137409B (en) | 2016-12-28 |
| WO2013125320A1 (en) | 2013-08-29 |
| KR101734975B1 (en) | 2017-05-12 |
| JP2013172578A (en) | 2013-09-02 |
| KR20140123090A (en) | 2014-10-21 |
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