CN111510011B - Method for inhibiting DC voltage oscillation of auxiliary converter of electric locomotive - Google Patents
Method for inhibiting DC voltage oscillation of auxiliary converter of electric locomotive Download PDFInfo
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- CN111510011B CN111510011B CN202010445777.4A CN202010445777A CN111510011B CN 111510011 B CN111510011 B CN 111510011B CN 202010445777 A CN202010445777 A CN 202010445777A CN 111510011 B CN111510011 B CN 111510011B
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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
- H02M1/0038—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 invention relates to a method for inhibiting direct current voltage oscillation of a converter, in particular to a method for inhibiting direct current voltage oscillation of an auxiliary converter of an electric locomotive. Solves the defects and problems existing in the prior art, and provides an electric locomotive auxiliaryThe suppression control method for the direct-current voltage oscillation of the converter is simple, good in effect, and strong in flexibility and applicability. The inhibition method is realized by the following steps: the method comprises the following steps: DC voltage U of inversion side under different power levelsdcAnd current IdcSelecting the maximum value f from the oscillation frequencies fmaxAnd corresponding phase difference deltaθmax(ii) a Step two: real-time acquisition of DC voltage U at inversion sidedc(ii) a Step three: calculating DC voltage U of inversion sidedcAmount of oscillation ΔU(ii) a Step four: selecting corresponding parameters A, B and calculating the compensation quantity delta of modulation ratioM(ii) a Step five: calculating the compensation amount deltaMn(ii) a Step six: for aMOr ΔMnCarrying out amplitude limiting operation; step seven: the modulation ratio M is compared with the compensation quantity deltaMOr ΔMnAdding, carrying out amplitude limiting processing on the added result, and then using the result in an inverse modulation algorithm.
Description
Technical Field
The invention relates to a method for inhibiting direct current voltage oscillation of a converter, in particular to a method for inhibiting direct current voltage oscillation of an auxiliary converter of an electric locomotive.
Background
In the application of a typical high-power electric locomotive auxiliary converter, because the input voltage level is high, a main circuit often connects a Buck chopper Buck circuit and an inverter together in a cascade mode (as shown in fig. 1), after the direct-current voltage input by the auxiliary converter is reduced by the Buck chopper Buck circuit, the direct-current voltage is inverted by a three-phase inverter to output auxiliary three-phase alternating current required by the electric locomotive, wherein two input and output sides of the Buck chopper Buck circuit are respectively called an input side and an inversion side. When the parasitic parameters or the output power of the auxiliary system change, the direct-current voltage on the input side or the direct-current voltage on the inversion side easily vibrates due to the negative impedance characteristic, so that the output voltage of the auxiliary converter fluctuates greatly, and the use requirement cannot be met.
In the engineering, for the problem of direct-current voltage oscillation, the direct-current voltage oscillation is often suppressed by serially adding a resistor or adding an intermediate support capacitor to the intermediate direct-current bus side of the auxiliary converter. However, energy loss is increased through series connection of resistors, system efficiency is reduced, and the size and cost of the auxiliary converter are increased by increasing the supporting capacitor; the flexibility is not enough by changing the mode of the support capacitor or the series resistor of the converter, and the converter is not applicable any more after the working condition is changed; meanwhile, the existing method cannot determine the initial specific position of the direct-current voltage oscillation, and is inconvenient for subsequent optimization of the system.
Disclosure of Invention
The invention solves the defects and problems of the existing method for inhibiting the direct-current voltage oscillation of the auxiliary converter of the electric locomotive, and provides the method for inhibiting the direct-current voltage oscillation of the auxiliary converter of the electric locomotive, which has the advantages of simple control method, good effect, high flexibility and high applicability.
The invention is realized by adopting the following technical scheme: the method for suppressing the direct-current voltage oscillation of the auxiliary converter of the electric locomotive is characterized in that the auxiliary converter is formed by cascade connection of a Buck chopper Buck circuit and an inverter, and the suppression method is realized by the following steps:
the method comprises the following steps: through test measurement, the test waveforms of the selected auxiliary converter under different power levels (from no load to full load) are obtained, and the inversion side direct current voltage U corresponding to the different power levels is obtaineddcAnd current IdcAnd the corresponding inverter-side DC voltage UdcAnd current IdcPhase difference Δ ofθWherein, isθ＝θU-θI，θUFor inverting the phase of the side DC voltage, thetaIThe phase is the direct current phase of the inversion side; DC voltage U of inversion side under different power levelsdcAnd current IdcSelecting the maximum value f from the oscillation frequencies fmaxAnd corresponding phase difference deltaθmax；
Step two: real-time acquisition of DC voltage U at inversion sidedc；
Step three: calculating DC voltage U of inversion sidedcAmount of oscillation ΔU，ΔU＝Udc-Uref，UrefThe target value of the direct current voltage at the inversion side is obtained;
step four: let Delta beTheta supplement＝180°-ΔθmaxWhen Δ isTheta supplementNot more than 45 degrees according to the angleTheta supplementThe corresponding parameter A, B is selected as follows:
0°＜Δtheta supplementWhen the temperature is less than or equal to 5 degrees, A is 1, B is 1/0.08412132;
5°＜Δtheta supplementWhen the temperature is less than or equal to 10 degrees, A is 0.984835645397554, B is 1/0.17616129;
10°＜Δtheta supplementWhen the angle is less than or equal to 15 degrees, A is 0.966092383592143, B is 1/0.26725875;
15°＜Δtheta supplementWhen the temperature is less than or equal to 20 degrees, A is 0.939916925046859, B is 1/0.36322704;
20°＜Δtheta supplementWhen the temperature is less than or equal to 25 ℃, A is 0.906435415347077, B is 1/0.46593993;
25°＜Δtheta supplementWhen the temperature is less than or equal to 30 degrees, A is 0.866354444531846, B is 1/0.57647266;
30°＜Δtheta supplementWhen the temperature is less than or equal to 35 degrees, A is 0.819387258924401, B is 1/0.69959639;
35°＜Δtheta supplementWhen the temperature is less than or equal to 40 ℃, A is 0.766130961732220, B is 1/0.83887027;
40°＜Δtheta supplementWhen the angle is less than or equal to 45 degrees, A is 0.707106781186548, B is 1;
according to the formula
Calculating the modulation ratio compensation quantity delta for inhibiting voltage oscillationM(ii) a Function F (F)cut,ΔU) Is a first-order low-pass digital filter, FcutA cut-off frequency of a first-order low-pass digital filter, the magnitude of which is in accordance with Fcut＝B·2π·fmaxCalculating;
step five: if ΔTheta supplementGreater than 45 deg., into n values less than or equal to 45 deg., i.e. deltaTheta supplement＝ΔTheta is complemented by 1+ΔTheta plus 2+...+ΔTheta is compensated for nIn which ΔTheta is complemented by 1、ΔTheta plus 2、...、ΔTheta is compensated for nN is less than or equal to 45 degrees, and according to the decomposition clearance angle value, according to the step four respectively selecting corresponding A, B values, compensating quantity deltaMnThe method comprises the following steps:
wherein A isnTo correspond to ΔTheta is compensated for nA value of (A), Fcut(n)＝Bn·2π·fmax，BnTo correspond to ΔTheta is compensated for nB value of (2);
step six: for aMOr ΔMnPerforming a clipping operation, ΔMOr ΔMnThe value range is as follows:
-Mmax·25％＜ΔM＜Mmax·25％，-Mmax·25％＜ΔMn＜Mmax25% (i.e., Δ)MOr ΔMnGreater than MmaxWhen 25%, take equal to Mmax·25％；ΔMOr ΔMnLess than-MmaxWhen 25%, take to be equal to-Mmax25%; at Mmax25% and-MmaxBetween 25%, get the real value), where MmaxDesigning a maximum value for the three-phase inversion modulation ratio;
step seven: modulating ratio M and compensation quantity delta calculated by inverter controlMOr ΔMnAdding the two components, and performing amplitude limiting processing on the addition result, i.e. 0 < M + deltaM＜Mmax,0＜M+ΔMn＜MmaxAnd then the result is used in the inverse modulation algorithm.
Compared with the prior art, the control method for inhibiting the direct-current voltage oscillation is simple, good in effect, flexible and high in applicability.
Drawings
FIG. 1 is a main circuit structure diagram of an auxiliary converter of an electric locomotive;
FIG. 2 is a schematic waveform diagram of voltage and current of the inverter side DC voltage;
fig. 3 is a schematic waveform diagram of voltage and current when the input side dc voltage oscillates.
Detailed Description
The method for suppressing the direct-current voltage oscillation of the auxiliary converter of the electric locomotive is characterized in that the auxiliary converter is formed by cascade connection of a Buck chopper Buck circuit and an inverter, and the suppression method is realized by the following steps:
the method comprises the following steps: through test measurement, the test waveforms of the selected auxiliary converter under different power levels (from no load to full load) are obtained, and the inversion side direct current voltage U corresponding to the different power levels is obtaineddcAnd current IdcAnd the corresponding inverter-side DC voltage UdcAnd current IdcPhase difference Δ ofθWherein, isθ＝θU-θI，θUFor inverting the phase of the side DC voltage, thetaIThe phase is the direct current phase of the inversion side; DC voltage U of inversion side under different power levelsdcAnd current IdcSelecting the maximum value f from the oscillation frequencies fmaxAnd corresponding phase difference deltaθmax；
Step two: real-time acquisition of DC voltage U at inversion sidedc；
Step three: calculating DC voltage U of inversion sidedcAmount of oscillation ΔU，ΔU＝Udc-Uref，UrefThe target value of the direct current voltage at the inversion side is obtained;
step four: let Delta beTheta supplement＝180°-ΔθmaxWhen Δ isTheta supplementNot more than 45 degrees according to the angleTheta supplementThe corresponding parameter A, B is selected as follows:
0°＜Δtheta supplementWhen the temperature is less than or equal to 5 degrees, A is 1, B is 1/0.08412132;
5°＜Δtheta supplementWhen the temperature is less than or equal to 10 degrees, A is 0.984835645397554, B is 1/0.17616129;
10°＜Δtheta supplementWhen the angle is less than or equal to 15 degrees, A is 0.966092383592143, B is 1/0.26725875;
15°＜Δtheta supplementWhen the temperature is less than or equal to 20 degrees, A is 0.939916925046859, B is 1/0.36322704;
20°＜Δtheta supplementWhen the temperature is less than or equal to 25 ℃, A is 0.906435415347077, B is 1/0.46593993;
25°＜Δtheta supplementWhen the temperature is less than or equal to 30 degrees, A is 0.866354444531846, B is 1/0.57647266;
30°＜Δtheta supplementWhen the temperature is less than or equal to 35 degrees, A is 0.819387258924401, B is 1/0.69959639;
35°＜Δtheta supplementWhen the temperature is less than or equal to 40 ℃, A is 0.766130961732220, B is 1/0.83887027;
40°＜Δtheta supplementWhen the angle is less than or equal to 45 degrees, A is 0.707106781186548, B is 1;
according to the formula
Calculating the modulation ratio compensation quantity delta for inhibiting voltage oscillationM(ii) a Function F (F)cut,ΔU) Is a first-order low-pass digital filter, FcutA cut-off frequency of a first-order low-pass digital filter, the magnitude of which is in accordance with Fcut＝B·2π·fmaxCalculating;
step five: if ΔTheta supplementGreater than 45 deg., into n values less than or equal to 45 deg., i.e. deltaTheta supplement＝ΔTheta is complemented by 1+ΔTheta plus 2+...+ΔTheta is compensated for nIn which ΔTheta is complemented by 1、ΔTheta plus 2、...、ΔTheta is compensated for nN is less than or equal to 45 deg. (e.g. 60 deg. is decomposed into 45 deg. and 15 deg., or six 10 deg., or three 20 deg., … …), and according to the decomposition angle value, according to step four, respectively selecting corresponding A, B values, compensating quantity delta is respectivelyMnThe method comprises the following steps:
step six: for aMOr ΔMnPerforming a clipping operation, ΔMOr ΔMnThe value range is as follows:
-Mmax·25％＜ΔM＜Mmax·25％，-Mmax·25％＜ΔMn＜Mmax·25％(i.e., Δ)MOr ΔMnGreater than MmaxWhen 25%, take equal to Mmax·25％；ΔMOr ΔMnLess than-MmaxWhen 25%, take to be equal to-Mmax25%; at Mmax25% and-MmaxBetween 25%, get the real value), where MmaxDesigning a maximum value for the three-phase inversion modulation ratio;
step seven: modulating ratio M and compensation quantity delta calculated by inverter controlMOr ΔMnAdding the two components, and performing amplitude limiting processing on the addition result, i.e. 0 < M + deltaM＜Mmax,0＜M+ΔMn＜MmaxAnd then the result is used in the inverse modulation algorithm.
In specific implementation, the phase difference delta in the step oneθmaxIt can also be used to determine the location of the dc voltage oscillation: when deltaθmaxWhen the angle is 180 degrees (namely the wave peak of the direct current voltage at the inversion side corresponds to the wave trough of the direct current at the inversion side), judging that the direct current voltage oscillation occurs at the inversion side; when 0 < deltaθmaxAnd when the angle is less than 180 degrees, judging that the direct current voltage oscillation occurs on the input side. To facilitate subsequent optimization of the system. The schematic diagrams of the voltage and current waveforms during oscillation are shown in fig. 2 and 3; fig. 2 is a schematic voltage-current waveform of the dc voltage on the inverter side oscillating, and fig. 3 is a schematic voltage-current waveform of the dc voltage on the input side oscillating.
Claims (2)
1. The method for suppressing the direct-current voltage oscillation of the auxiliary converter of the electric locomotive is characterized in that the suppression method is realized by the following steps:
the method comprises the following steps: through test measurement, the test waveforms of the selected auxiliary converter under different power levels are obtained to obtain the inversion side direct current voltage U corresponding to the different power levelsdcAnd current IdcAnd the corresponding inverter-side DC voltage UdcAnd current IdcPhase difference Δ ofθWherein, isθ＝θU-θI，θUFor inverting the phase of the side DC voltage, thetaIIs the inverse ofChanging the phase of the side direct current; DC voltage U of inversion side under different power levelsdcAnd current IdcSelecting the maximum value f from the oscillation frequencies fmaxAnd corresponding phase difference deltaθmax；
Step two: real-time acquisition of DC voltage U at inversion sidedc；
Step three: calculating DC voltage U of inversion sidedcAmount of oscillation ΔU，ΔU＝Udc-Uref，UrefThe target value of the direct current voltage at the inversion side is obtained;
step four: let Delta beTheta supplement＝180°-ΔθmaxWhen Δ isTheta supplementNot more than 45 degrees according to the angleTheta supplementThe corresponding parameter A, B is selected as follows:
0°＜Δtheta supplementWhen the temperature is less than or equal to 5 degrees, A is 1, B is 1/0.08412132;
5°＜Δtheta supplementWhen the temperature is less than or equal to 10 degrees, A is 0.984835645397554, B is 1/0.17616129;
10°＜Δtheta supplementWhen the angle is less than or equal to 15 degrees, A is 0.966092383592143, B is 1/0.26725875;
15°＜Δtheta supplementWhen the temperature is less than or equal to 20 degrees, A is 0.939916925046859, B is 1/0.36322704;
20°＜Δtheta supplementWhen the temperature is less than or equal to 25 ℃, A is 0.906435415347077, B is 1/0.46593993;
25°＜Δtheta supplementWhen the temperature is less than or equal to 30 degrees, A is 0.866354444531846, B is 1/0.57647266;
30°＜Δtheta supplementWhen the temperature is less than or equal to 35 degrees, A is 0.819387258924401, B is 1/0.69959639;
35°＜Δtheta supplementWhen the temperature is less than or equal to 40 ℃, A is 0.766130961732220, B is 1/0.83887027;
40°＜Δtheta supplementWhen the angle is less than or equal to 45 degrees, A is 0.707106781186548, B is 1;
according to the formula
Calculating the modulation ratio compensation quantity delta for inhibiting voltage oscillationM(ii) a Function F (F)cut,ΔU) Is a first-order low-pass digital filter, FcutA cut-off frequency of a first-order low-pass digital filter, the magnitude of which is in accordance with Fcut＝B·2π·fmaxCalculating;
step five: if ΔTheta supplementGreater than 45 deg., into n values less than or equal to 45 deg., i.e. deltaTheta supplement＝ΔTheta is complemented by 1+ΔTheta plus 2+...+ΔTheta is compensated for nIn which ΔTheta is complemented by 1、ΔTheta plus 2、...、ΔTheta is compensated for nN is less than or equal to 45 degrees, and according to the decomposition clearance angle value, according to the step four respectively selecting corresponding A, B values, compensating quantity deltaMnThe method comprises the following steps:
wherein A isnTo correspond to ΔTheta is compensated for nA value of (A), Fcut(n)＝Bn·2π·fmax，BnTo correspond to ΔTheta is compensated for nB value of (2);
step six: for aMOr ΔMnPerforming a clipping operation, ΔMOr ΔMnThe value range is-Mmax·25％＜ΔM＜Mmax·25％，-Mmax·25％＜ΔMn＜Mmax25% of where MmaxDesigning a maximum value for the three-phase inversion modulation ratio;
step seven: modulating ratio M and compensation quantity delta calculated by inverter controlMOr ΔMnAdding the two components, and performing amplitude limiting processing on the addition result, i.e. 0 < M + deltaM＜Mmax,0＜M+ΔMn＜MmaxAnd then the result is used in the inverse modulation algorithm.
2. The method according to claim 1, wherein the phase difference Δ in the first step isθmaxIt can also be used to determine the location of the dc voltage oscillation: when deltaθmaxWhen the angle is 180 degrees, judging that the direct-current voltage oscillation occurs on the inversion side; when 0 < deltaθmaxAnd when the angle is less than 180 degrees, judging that the direct current voltage oscillation occurs on the input side.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108565888A (en) * | 2018-02-06 | 2018-09-21 | 武汉理工大学 | A kind of stabilizer for inhibiting wind generator system DC voltage to vibrate |
| CN109245149A (en) * | 2017-07-11 | 2019-01-18 | 浙江昱能科技有限公司 | A kind of control method and system of gird-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245149A (en) * | 2017-07-11 | 2019-01-18 | 浙江昱能科技有限公司 | A kind of control method and system of gird-connected inverter |
| CN108565888A (en) * | 2018-02-06 | 2018-09-21 | 武汉理工大学 | A kind of stabilizer for inhibiting wind generator system DC voltage to vibrate |
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