CN108923442B - Unbalanced voltage oscillation suppression method, controller and system - Google Patents
Unbalanced voltage oscillation suppression method, controller and system Download PDFInfo
- Publication number
- CN108923442B CN108923442B CN201810996628.XA CN201810996628A CN108923442B CN 108923442 B CN108923442 B CN 108923442B CN 201810996628 A CN201810996628 A CN 201810996628A CN 108923442 B CN108923442 B CN 108923442B
- Authority
- CN
- China
- Prior art keywords
- direct current
- phase
- current
- compensation
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a carrier modulation method, a controller and a system considering voltage unbalance. The carrier modulation method comprises the following steps: injecting the direct current component into the three-phase modulation signal of the Vienna rectifier to obtain a direct current compensated three-phase modulation signal; judging the sector according to the polarity of the three-phase input current of the Vienna rectifier, and judging whether the current sector belongs to a normal interval or not according to the consistency of the three-phase modulation signal after direct-current compensation and the polarity of the three-phase input current; in an abnormal interval, injecting a compensation component into the three-phase modulation signal after the direct current compensation so as to eliminate the current distortion of the alternating current side; and in a normal interval, injecting an optimized zero sequence component into the DC compensated three-phase modulation signal to inhibit the voltage oscillation on the DC side.
Description
Technical Field
The invention belongs to the field of power electronics, and particularly relates to a method, a controller and a system for suppressing unbalanced voltage oscillation.
Background
The active power factor correction technology is an effective way to solve the problem that a nonlinear element injects a large amount of harmonic waves into a power grid. The three-phase three-level Vienna rectification can realize the correction of input unit power factors, has the advantages of small harmonic wave, low switching loss, small electromagnetic interference and the like, has a simple circuit structure, small switching number and no bridge arm direct connection problem, and is suitable for the occasions of unidirectional high-voltage high-power conversion of energy. In order to further improve the power density, reduce the volume and the cost and reduce the direct current bus capacitance, the direct current bus capacitor becomes a new trend of academic hotspots and industrial application at home and abroad.
The number of the parallel direct current bus capacitors is reduced, and the power density of the Vienna rectifier can be further improved. However, when the Vienna rectifier selects a dc bus capacitor smaller than 500uF, both the conventional Sinusoidal Pulse Width Modulation (SPWM) and the carrier modulation technique of Space Vector Pulse Width Modulation (SVPWM) or zero sequence component injection cause dc voltage oscillation and current distortion problems. Particularly, when the direct current voltage is unbalanced, the oscillation and distortion are increased, deviation is generated from an expected value, and the quality of the direct current power consumption of the later stage is seriously influenced.
In summary, in order to improve the power density of the Vienna rectifier and reduce the cost, a novel modulation method is urgently needed to suppress the direct current voltage oscillation, eliminate the current distortion, improve the electric energy quality under the conditions of the balance and unbalance of the direct current voltage, and ensure the safe and stable operation of the system.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a carrier modulation method for suppressing unbalanced direct current voltage oscillation, which can reduce direct current capacitance of a Vienna rectifier, and has the effects of effectively suppressing direct current voltage oscillation, reducing input current harmonic content and improving the power quality of an alternating current side and a direct current side under a balanced or unbalanced condition.
The invention relates to a carrier modulation method considering voltage unbalance, which comprises the following steps:
injecting the direct current component into the three-phase modulation signal of the Vienna rectifier to obtain a direct current compensated three-phase modulation signal;
judging the sector according to the polarity of the three-phase input current of the Vienna rectifier, and judging whether the current sector belongs to a normal interval or not according to the consistency of the three-phase modulation signal after direct-current compensation and the polarity of the three-phase input current;
in an abnormal interval, injecting a compensation component into the three-phase modulation signal after the direct current compensation so as to eliminate the current distortion of the alternating current side;
in a normal interval, injecting an optimized zero sequence component into the three-phase modulation signal after direct current compensation so as to inhibit voltage oscillation at the direct current side;
the direct current component is formed by the sum of the output of a controller for adjusting the direct current voltage difference value and a direct current bus voltage unbalance coefficient; the direct current bus voltage unbalance coefficient is the ratio of the difference between the positive direct current bus voltage and the negative direct current bus voltage and the sum of the positive direct current bus voltage and the negative direct current bus voltage.
Furthermore, in the abnormal interval, in the process of injecting compensation components into the three-phase modulation signal after direct current compensation, for the P-type abnormal interval, the modulation waveform with the same polarity is compensated, and the compensation components are consistent with the clamp phase compensation components.
Furthermore, in the abnormal interval, in the process of injecting a compensation component into the three-phase modulation signal after the dc compensation, for the P-type abnormal interval, the modulation waveforms with different polarities are compensated, and the compensation component and the clamp phase compensation component use a conversion coefficient T1, where T1 is (1-k)/(1+ k), and k is a dc bus voltage imbalance coefficient.
Furthermore, in the abnormal interval, in the process of injecting compensation components into the three-phase modulation signal after direct current compensation, for the N-type abnormal interval, the modulation waveform with the same polarity is compensated, and the compensation components are consistent with the clamp phase compensation components.
Furthermore, in the process of injecting compensation components into the three-phase modulation signal after the dc compensation in the abnormal interval, for the N-type abnormal interval, the modulation waveforms with different polarities are compensated, and the conversion coefficient T2 is used for the compensation components and the clamp phase compensation components, where T2 is (1+ k)/(1-k), and k is the dc bus voltage imbalance coefficient.
Further, the process of obtaining the optimized zero sequence component is as follows:
obtaining a common variable of a current sector;
taking a common variable of a current sector as a dividend, multiplying a sign value of a current phase input current signal by a direct current bus voltage unbalance coefficient, accumulating 1 to be used as a divisor, and further solving a quotient to obtain an optimized zero sequence component;
the common variable of the current sector is a quotient value, the dividend is the sum of products of absolute values of the modulation signals and the input current after three-phase direct current compensation, and the divisor is the accumulated value of the product of a sign value of the current-phase input current signal and a direct current bus voltage unbalance coefficient and 1.
The invention also provides a carrier modulation controller considering the voltage unbalance.
The carrier modulation controller considering the voltage unbalance is configured to operate the carrier modulation method considering the voltage unbalance.
The invention also provides a carrier modulation control system considering the voltage unbalance.
The carrier modulation control system considering the voltage unbalance comprises the carrier modulation controller considering the voltage unbalance.
Compared with the prior art, the invention has the beneficial effects that:
(1) the carrier modulation method considering the voltage unbalance is used for reducing the direct current capacitance of the Vienna rectifier and improving the power density; under the conditions of balance and unbalance of direct-current voltage, the low harmonic operation of alternating-current side current of the Vienna rectifier is realized, and lower harmonic pollution on the power grid side is ensured;
(2) according to the carrier modulation method considering the voltage unbalance, the oscillation suppression of the direct-current voltage of the Vienna rectifier is realized under the conditions of the balance and unbalance of the direct-current voltage, and the electric energy quality of the rear-stage electric equipment is guaranteed;
(3) the carrier modulation method considering the voltage unbalance reduces the amplitude of the neutral current, can effectively reduce the design capacity of a direct current capacitor, greatly reduces the volume and the cost of the Vienna rectifier, and improves the power density of the rectifier;
(4) the carrier modulation method considering the voltage unbalance is easy to realize digitally, and can be popularized and applied to the fields of battery testing, distributed charging facilities, new energy power generation systems, micro-grids and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a typical topology of a Vienna rectifier applied to an unbalanced DC voltage;
FIG. 2 is a diagram illustrating the modulation waveform and abnormal interval judgment after the injection of the DC component in the DC voltage balance state;
FIG. 3 is a diagram illustrating the modulation waveform and abnormal interval judgment after the injection of the DC component under the unbalanced DC voltage condition;
FIG. 4 is a modulation waveform after injection of an optimized zero sequence component and a compensation component in a DC voltage balance state;
FIG. 5 is a diagram of an optimized zero sequence component and compensation component and a modulation waveform after injection in a DC voltage unbalance state (when k is 0-1);
FIG. 6 is a diagram of the optimized zero sequence component and compensation component and the modulation waveform after injection in the unbalanced DC voltage state (when k is-1 to 0);
fig. 7(a) shows the input current and dc voltage oscillation simulation waveforms only after the compensation component is injected in the abnormal interval in the voltage balance state;
fig. 7(b) is a simulation waveform of input current and dc voltage oscillation in the voltage balance state after injecting compensation component in abnormal interval and injecting optimized zero sequence component in normal interval;
fig. 8(a) shows the input current and dc voltage oscillation simulation waveforms only after the compensation component is injected in the abnormal section in the unbalanced voltage state;
fig. 8(b) is a simulation waveform of input current and dc voltage oscillation in the case of voltage unbalance, after injecting compensation component in abnormal interval and optimized zero sequence component in normal interval;
FIG. 9 is a schematic diagram of a carrier modulation method of the present invention to reduce the Vienna rectifier DC capacitance and account for voltage imbalance.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides a carrier modulation structure for three component injections:
1. injecting a direct current component for controlling the midpoint potential of the Vienna rectifier;
2. compensation component injection for eliminating alternating current side current distortion;
3. and the optimized zero-sequence component injection is used for inhibiting the direct-current voltage oscillation.
The carrier modulation method is suitable for modulation of a Vienna rectifier. The carrier modulation method of the invention firstly injects the direct current component and then injects the alternating current component. Wherein, the direct current component is the calculated result of the measured unbalance coefficient and the output of the controller (such as PI controller and PID controller) for adjusting the direct current voltage difference value are added;
for example: the PI controller is used for regulating the DC voltage difference, such as 700V of the total bus, and the expected difference between the top and bottom capacitor voltages is DelauurefAt 100V, u1 and u2 can be controlled at 400V and 300V, respectively.
The alternating current component includes: an optimized zero sequence component and a compensation component.
The capacitance value of the direct current bus capacitor is designed to be less than 500uF, the parallel connection number of the direct current bus capacitors is reduced, and the volume and the cost of the Vienna rectifier are reduced; the carrier modulation method provided by the invention inhibits direct-current voltage oscillation, and not only improves the high reliability of the operation of the Vienna rectifier, but also greatly expands the wide voltage output application aiming at the high-quality electric energy quality of the alternating-current side and the direct-current side when the voltage is unbalanced.
The carrier modulation method has the main function of effectively inhibiting the direct current voltage oscillation under the condition that the alternating current side current contains less harmonic waves when the direct current voltage is unbalanced.
The modulation method for optimizing the zero-sequence component injection carrier is suitable for the topological structure of the Vienna rectifier shown in figure 1.
The principle of the modulation method in the invention, as shown in fig. 9, the technical implementation steps include:
step 1: and injecting the direct current component into the three-phase modulation signal of the Vienna rectifier to obtain the three-phase modulation signal after direct current compensation.
The direct current component is formed by the sum of the output of a controller for adjusting the direct current voltage difference value and a direct current bus voltage unbalance coefficient; the direct current bus voltage unbalance coefficient is the ratio of the difference between the positive direct current bus voltage and the negative direct current bus voltage and the sum of the positive direct current bus voltage and the negative direct current bus voltage.
Specifically, if the positive dc bus voltage is measured as u1 and the negative dc bus voltage is measured as u2, the dc bus voltage imbalance coefficient k is defined, and the sum of the PI controller output and k constitutes the dc component k'.
Three-phase modulation signal v of Vienna rectifiera_ref,vb_ref,vc_refAfter injection of the direct current component k' are respectively
After injecting the dc component k', when the dc voltage is balanced, the resulting modulation waveform is shown in fig. 2; when the dc voltage is unbalanced, the resulting modulation waveform is shown in fig. 3.
Step 2: and judging the sector according to the polarity of the three-phase input current of the Vienna rectifier, and judging whether the current sector belongs to a normal interval or not according to the consistency of the three-phase modulation signal after direct-current compensation and the polarity of the three-phase input current.
For example: when three-phase input current ia of the Vienna rectifier is greater than 0, ib is less than 0, and ic is less than 0, the sector R is 1; when ia >0, ib >0, ic <0, sector R ═ 2; when ia <0, ib >0, ic <0, sector R is 3; when ia <0, ib >0, ic >0, sector R is 4; when ia <0, ib <0, ic >0, sector R is 5; when ia >0, ib <0, ic >0, sector R is 6.
And judging and numbering the normal interval and the abnormal interval in each sector according to the modulation waveforms va, vb and vc obtained after the direct current compensation. The judgment method is that the modulation waveform and the phase current polarity or sign are inconsistent, and the judgment method is defined as an abnormal interval, and the consistent area is a normal interval.
For example: when the interval R is 1, ia >0, ib <0, ic < 0. If vc is not consistent with ic polarity (ic <0, vc >0), this interval is defined as abnormal interval P _ A; if vb is not consistent with ic polarity (ib <0, vb >0), this interval is defined as abnormal interval P _ B; the remaining interval is defined as a normal interval of the sector 1. Similarly, the normal interval and abnormal interval of other sectors are identified as shown in table 1.
TABLE 1 judgment conditions of Normal and abnormal intervals
Injecting compensation component in abnormal interval, wherein the injection expression is
In which the compensation component vza，vzb，vzcThe values in each abnormal interval are shown in table 2.
Taking sector 1 as an example, in the abnormal interval P _ a, firstly, the modulation waveform vc injected with the dc component should be clamped to zero level because the polarity of vc is not consistent with the polarity of current ic. The c-phase is therefore called the clamp phase and its offset vzc ═ vc.
When the non-clamped phase is compensated, because vb and vc have the same polarity, vzb-vzc-vc is obtained. Finally, va and vc are opposite in polarity, so the relationship between vza and vzc has a conversion factor (T1 ═ 1-k)/(1+ k)), i.e., vza ═ T1 × vc.
In the abnormal interval P _ B, firstly, the modulation waveform vb injected with the dc component should be clamped to zero level because the polarity of vb is not consistent with the polarity of the current ib. Phase b is therefore called the clamp phase and its offset vzb ═ vb.
When the non-clamped phase is compensated, since vb has the same polarity as vc, so that vzb ═ vzc ═ vb and finally va and vb have opposite polarities, the same conversion coefficient (T1 ═ 1-k)/(1+ k)) exists in the relationship between vza and vzb, that is, vza ═ T1 ×) vb.
Taking sector 2 as an example, in the abnormal interval N _ a, first, the modulation waveform vb after injecting the dc component should be clamped to zero level due to the inconsistency between the polarity of vb and the current ib. The b-phase is therefore called the clamp phase and its compensation component is vzb ═ vb.
And secondly, because the vb has the same polarity as the va, vza-vzb-vb is obtained. Finally vc is of opposite polarity to vb, so there is another conversion factor (T2 ═ 1+ k)/(1-k)) in the relationship between vzc and vzb, i.e., vzc ═ T2 × vb.
In the abnormal section N _ B, first, the modulation waveform va after injecting the dc component should be clamped to zero level because the polarity of va is not consistent with the current ia. The a phase is therefore called the clamp phase and its compensation component is vza ═ va.
And secondly, because the polarities of va and vb are the same, vzb-vza-vb is obtained. Finally vc is opposite in polarity to va, so the relationship between vzc and vza is that there is also another conversion factor (T2 ═ 1+ k)/(1-k)), i.e. vzc ═ T2 ═ va.
When the non-clamped phase modulation waveform with the same polarity as the clamped phase modulation waveform is compensated in the abnormal interval of the P type, the compensation component is equal to the clamped phase compensation component; when the non-clamped phase compensation with opposite modulation waveform polarity is carried out, the compensation component and the clamped phase compensation component use a conversion coefficient T1.
(explain: when judging the sector is abnormal, comparing the polarity of the voltage and the current, the voltage and the current polarity of only one clamping phase are not consistent, and the voltage and the current polarity of the other two non-clamping phases are consistent.
Therefore, for the non-clamped phase, the effect of comparing the voltage and current polarities and comparing the current and current polarities is equivalent when determining whether there is a conversion coefficient between the compensation amounts. )
When the non-clamp phase modulation waveform with the same polarity as the clamp phase modulation waveform is compensated in the N-type abnormal interval, the compensation component is equal to the clamp phase compensation component; when the non-clamped phase compensation with opposite modulation waveform polarity is carried out, the compensation component and the clamped phase compensation component use a conversion coefficient T2.
TABLE 2 Compensation component calculation for abnormal intervals
And injecting an optimized zero sequence component in a normal interval.
Assuming that each sector R has a common variable vz 1-vz 6, for example, the common variable vz1 in sector R is 1, the calculation formula is the sum of the products of the three-phase modulation signals and the absolute values of the input currents and the absolute values of the three-phase input currents divided by the corresponding imbalance coefficients.
Calculation formula of common variable:
the optimized zero-sequence component calculation formula is as follows:
wherein x is a, b, c. The detailed calculation of the optimized zero sequence component is shown in table 3.
TABLE 3 optimized zero sequence component calculation
Under the condition of direct-current voltage balance, according to the compensation component, the optimized zero-sequence component and the injected modulation waveform, the method is shown in fig. 4; under the condition of unbalanced direct current voltage and when k is within the range of 0-1, the modulation waveform after injection is shown in fig. 5 according to the compensation component, the optimized zero sequence component and the injected modulation waveform; when the waveform falls within the range of-1 to 0, the waveform is shown in FIG. 6.
Calculating the mean value i of the neutral current according to the three-phase modulation waveforms v ' a, v ' b and v ' c obtained in the above stepsnp. The calculation formula is as follows
inp＝v′a|ia|+v′b|ib|+v′c|ic|
Aiming at the Vienna rectifier, when a small direct current capacitor is selected, software simulation verifies that the carrier modulation method provided by the invention can effectively inhibit the current harmonic content and direct current voltage oscillation on the alternating current side under the condition that the direct current bus voltage is balanced and unbalanced, and obviously improve the electric energy quality on the input and output sides. MATLAB/simulink 2016B was selected for the simulation software, and the simulation parameters are shown in Table 4.
TABLE 4 simulation parameters
| Effective value V of power grid phase voltageg(RMS) | 220V |
| Frequency f of the grid | 50Hz |
| Voltage V at DC sidedc | 800V |
| DC side capacitor C1、C2 | 470μF |
| Filter inductance L | 3mH |
| Line resistance Rs | 0.05Ω |
| Simulation step length | 2.5μs |
| DC load R | 35Ω |
Fig. 7 shows simulation waveforms of modulation, input current, dc voltage, and neutral current in a voltage balance state, according to the carrier modulation method of the present invention. Wherein FIG. 7(a) injects the compensation component only in the abnormal interval; fig. 7(b) illustrates that the carrier modulation method according to the present invention is applied to inject not only the compensation component in the abnormal interval but also the optimized zero sequence component in the normal interval. Comparing fig. 7(a) and fig. 7(b), it can be seen that the adjustment method of the present invention can reduce the dc voltage oscillation amplitude of the Vienna rectifier and keep the current harmonics at the ac output side lower under the dc voltage balance condition.
FIG. 8 is a simulated waveform of modulation, input current, DC voltage, and neutral current in a voltage imbalance condition. Wherein FIG. 8(a) injects the compensation component only in the abnormal interval; fig. 8(b) illustrates a carrier modulation method according to the present invention. As can be seen by comparing fig. 8(a) and 8(b), the modulation method of the present invention also reduces dc voltage oscillation with a larger amplitude and ensures a higher power quality on the ac side under dc voltage imbalance conditions.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A method of carrier modulation in consideration of voltage imbalance, comprising:
injecting the direct current component into the three-phase modulation signal of the Vienna rectifier to obtain a direct current compensated three-phase modulation signal;
judging the sector according to the polarity of the three-phase input current of the Vienna rectifier, and judging whether the current sector belongs to a normal interval or not according to the consistency of the three-phase modulation signal after direct-current compensation and the polarity of the three-phase input current;
in an abnormal interval, injecting a compensation component into the three-phase modulation signal after the direct current compensation so as to eliminate the current distortion of the alternating current side;
in a normal interval, injecting an optimized zero sequence component into the three-phase modulation signal after direct current compensation so as to inhibit voltage oscillation at the direct current side;
the direct current component is formed by the sum of the output of a controller for adjusting the direct current voltage difference value and a direct current bus voltage unbalance coefficient; the direct current bus voltage unbalance coefficient is the ratio of the difference between the positive direct current bus voltage and the negative direct current bus voltage and the sum of the positive direct current bus voltage and the negative direct current bus voltage;
in the abnormal interval, in the process of injecting compensation components into the three-phase modulation signals after direct current compensation, for the P-type abnormal interval, the modulation waveforms with different polarities are compensated, and the compensation components and the clamp phase compensation components use conversion coefficients T1, wherein T1 is (1-k)/(1+ k), and k is a direct current bus voltage unbalance coefficient.
2. The carrier modulation method according to claim 1, wherein in the injecting the compensation component into the dc-compensated three-phase modulation signal in the abnormal section, the modulation waveform having the same polarity is compensated for the P-type abnormal section, and the compensation component is identical to the clamped-phase compensation component.
3. The carrier modulation method according to claim 1, wherein in the injecting the compensation component into the dc-compensated three-phase modulation signal in the abnormal section, the modulation waveform having the same polarity is compensated for the N-type abnormal section, and the compensation component is identical to the clamped-phase compensation component.
4. The carrier modulation method according to claim 1, wherein in the injecting the compensation component into the dc-compensated three-phase modulation signal in the abnormal interval, for the N-type abnormal interval, the modulation waveforms with different polarities are compensated, and the compensation component and the clamp phase compensation component use a conversion coefficient T2, where T2 is (1+ k)/(1-k), and k is a dc bus voltage imbalance coefficient.
5. The carrier modulation method taking into account voltage imbalance of claim 1,
the process of obtaining the optimized zero sequence component is as follows:
obtaining a common variable of a current sector;
taking a common variable of a current sector as a dividend, multiplying a sign value of a current phase input current signal by a direct current bus voltage unbalance coefficient, accumulating 1 to be used as a divisor, and further solving a quotient to obtain an optimized zero sequence component;
the common variable of the front sector is a quotient value, the dividend is the sum of products of absolute values of the modulation signals and the input current after three-phase direct current compensation, and the divisor is the accumulated value of the product of a sign value of the input current signal of the current phase and a direct current bus voltage unbalance coefficient and 1.
6. A carrier modulation controller taking into account voltage imbalance, characterized in that the carrier modulation controller taking into account voltage imbalance is configured to run the carrier modulation method taking into account voltage imbalance as claimed in any one of claims 1 to 5.
7. A carrier modulation control system taking into account voltage imbalance, comprising a carrier modulation controller taking into account voltage imbalance as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996628.XA CN108923442B (en) | 2018-08-29 | 2018-08-29 | Unbalanced voltage oscillation suppression method, controller and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996628.XA CN108923442B (en) | 2018-08-29 | 2018-08-29 | Unbalanced voltage oscillation suppression method, controller and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108923442A CN108923442A (en) | 2018-11-30 |
| CN108923442B true CN108923442B (en) | 2021-07-30 |
Family
ID=64407853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810996628.XA Active CN108923442B (en) | 2018-08-29 | 2018-08-29 | Unbalanced voltage oscillation suppression method, controller and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108923442B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583982B (en) * | 2022-05-06 | 2022-07-19 | 南京理工大学 | Vienna rectifier comprehensive optimization modulation method under unbalanced working condition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187887A (en) * | 2011-12-31 | 2013-07-03 | 伊顿公司 | Controller used for three-phase three-wire Vienna rectifier |
| CN106169879A (en) * | 2016-09-19 | 2016-11-30 | 山东大学 | Revise VIENNA rectifier modulator approach, controller and the system injecting zero-sequence component |
| CN106357135A (en) * | 2016-09-19 | 2017-01-25 | 山东大学 | VIENNA rectifier neutral point potential alternating-direct-current component balance control method |
| CN107147314A (en) * | 2017-06-13 | 2017-09-08 | 山东大学 | Correct the carrier modulating method of zero-sequence component injection |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9973097B2 (en) * | 2016-06-21 | 2018-05-15 | Astronics Advanced Electronic Systems Corp. | Regulating transformer rectifier unit with multiple circuits for preventing output overvoltage |
-
2018
- 2018-08-29 CN CN201810996628.XA patent/CN108923442B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187887A (en) * | 2011-12-31 | 2013-07-03 | 伊顿公司 | Controller used for three-phase three-wire Vienna rectifier |
| CN106169879A (en) * | 2016-09-19 | 2016-11-30 | 山东大学 | Revise VIENNA rectifier modulator approach, controller and the system injecting zero-sequence component |
| CN106357135A (en) * | 2016-09-19 | 2017-01-25 | 山东大学 | VIENNA rectifier neutral point potential alternating-direct-current component balance control method |
| CN107147314A (en) * | 2017-06-13 | 2017-09-08 | 山东大学 | Correct the carrier modulating method of zero-sequence component injection |
Non-Patent Citations (2)
| Title |
|---|
| VIENNA整流器中点电位振荡抑制与平衡控制研究;丁文龙等;《中国电机工程学报》;20171220;第37卷(第24期);第7284-7294页 * |
| VIENNA整流器网侧电流过零点波形畸变抑制方法;罗异等;《南方电网技术》;20160229;第10卷(第2期);第18-23页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108923442A (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ucar et al. | Control of a 3-phase 4-leg active power filter under non-ideal mains voltage condition | |
| CN105140921B (en) | A kind of electric power spring topological structure realized based on current source inverter and its control method | |
| Chaoui et al. | On the design of shunt active filter for improving power quality | |
| CN109494995B (en) | Neutral point potential balance control method suitable for VIENNA rectifier | |
| Karuppanan et al. | Five-level cascaded active filter for power line conditioners | |
| CN105406748A (en) | Control method for suppressing modularized multi-level current transformer output current harmonic wave | |
| Karmiris et al. | A multifunction control scheme for current harmonic elimination and voltage sag mitigation using a three phase three level flying capacitor inverter | |
| Li et al. | Analysis and application of passive damping LLCL filter in active power filter | |
| Waware et al. | A review of multilevel inverter based active power filter | |
| CN108923442B (en) | Unbalanced voltage oscillation suppression method, controller and system | |
| CN116683778B (en) | Single-phase AC-DC-AC converter and comprehensive coordination control method thereof | |
| CN116722750A (en) | Single-phase-three-phase converter and comprehensive coordination control method thereof | |
| Soomro et al. | Optimal design of a single-phase APF based on PQ theory | |
| TW201434254A (en) | Three-phase feedforward inductive current control device and the control method thereof | |
| Varaprasad et al. | An improved three level Hysteresis Current Controller for single phase shunt active power filter | |
| Gao et al. | A DC-link Balancing Control Strategy for NPC Three-level Shunt Active Power Filter | |
| Cheng et al. | A modified one cycle control of Vienna rectifier for neutral point voltage balancing control based on cycle-by-cycle correction | |
| CN109995260B (en) | Power grid control method based on quasi-Z-source three-level inverter | |
| CN117595262B (en) | Reactive harmonic suppression method for photovoltaic grid-connected inverter | |
| CN114583982B (en) | Vienna rectifier comprehensive optimization modulation method under unbalanced working condition | |
| Hua et al. | Improved feedforward based on lead compensation for LCL grid-connected inverter | |
| Li et al. | A Single-Phase PWM Rectifier with Power Decoupling and Parameter Drift Compensation | |
| Rajasekhar et al. | Mitigation of flicker sources & power quality improvement by using cascaded multi-level converter based DSTATCOM | |
| CN116707313B (en) | Comprehensive coordination control method for single-phase AC-DC converter | |
| Hui et al. | A novel active power filter using multilevel converter with self voltage balancing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |