CN106998067B - AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system - Google Patents
AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system Download PDFInfo
- Publication number
- CN106998067B CN106998067B CN201710274204.8A CN201710274204A CN106998067B CN 106998067 B CN106998067 B CN 106998067B CN 201710274204 A CN201710274204 A CN 201710274204A CN 106998067 B CN106998067 B CN 106998067B
- Authority
- CN
- China
- Prior art keywords
- active filter
- direct current
- transmission system
- phase
- current
- 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
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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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
- Y02E40/30—Reactive power compensation
-
- 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
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an alternating current active filter for compensating characteristic harmonic waves of a high-voltage direct current transmission system, which is characterized by comprising an active filter and a fundamental wave capacitor; the invention can improve the filtering performance and flexibility, reduce the equipment occupation area and reduce the risk of series resonance, and can be widely applied to the technical field of high-voltage direct current transmission.
Description
Technical Field
The invention relates to an alternating current active filter for compensating characteristic harmonic waves of a high-voltage direct current transmission system, and belongs to the technical field of high-voltage direct current transmission.
Background
The distribution pattern of energy resources and energy consumption in China determines the basic energy flow direction of 'western electric east delivery', and the pressure of power grid transmission is larger and larger along with the increase of load demand, so that the long-distance and large-scale western electric east delivery can be realized by adopting a direct current transmission mode with higher voltage level. In recent years, ultra-high voltage direct current transmission is put into operation in a national range, large-scale cross-region networking is realized, huge networking benefits including peak staggering, peak regulation, water and fire interaction, mutual standby, water discard electric quantity reduction and the like are obtained, network loss is reduced, and the method has important significance in constructing a resource-saving and environment-friendly power grid and accelerating energy resource optimization configuration.
The core device of the high-voltage direct current transmission system is a converter, the conversion from alternating current to direct current is realized through the converter, the working principle of the converter is that the thyristor is controlled to conduct at a fixed angle in a power frequency period, so that alternating current is converted into direct current, a large amount of harmonic waves are generated in the process and are injected into a power grid, and passive filter equipment is required to be configured in conventional high-voltage direct current engineering. At present, a twelve-pulse converter structure is generally adopted in a plurality of domestic high-voltage direct current projects, and compared with a six-pulse structure, the direct current characteristic harmonic wave of the (6 k+/-1) times can be effectively reduced, but the direct current characteristic harmonic wave of the (12 k+/-1) times with larger proportion can still be generated. The series of direct current characteristic harmonics account for more than 80% of the total harmonic content produced by the converter, so that the ac filters often require tuning points around 11, 13, 23, 25, 35 and 37 times. Although the passive filter has the advantages of simple structure, convenient manufacture and the like, the filtering performance is single, and the filtering effect is greatly affected due to the change of the voltage and the frequency of a power grid or the detuning of circuit elements of the passive filter; meanwhile, the passive filter has the defects of large occupied area, complex switching control strategy and the like, and the risk of series resonance with an alternating current system at specific times is possible, so that the safe operation of the alternating current system and the direct current engineering is threatened.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an ac active filter for compensating for characteristic harmonics of a high voltage dc power transmission system, which can effectively filter out the characteristic harmonics of dc and reduce the risk of series resonance.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the alternating current active filter is used for compensating characteristic harmonic waves of the high-voltage direct current transmission system and is characterized by comprising an active filter and a fundamental wave capacitor; the alternating current outgoing line of the active filter is connected with the conversion bus of the high-voltage direct current transmission system through the fundamental wave capacitor, the fundamental wave capacitor is used for bearing fundamental wave voltage of the high-voltage direct current transmission system, and the active filter is used for filtering direct current characteristic harmonic current generated by conversion of the high-voltage direct current transmission system after driving and conducting through internally generating PWM (pulse width modulation) signals.
Preferably, the primary system of the active filter comprises three-phase filtering branches, each phase of the filtering branches comprises a plurality of single-phase full-bridge current converting units, the single-phase full-bridge current converting units of each phase of the filtering branches are sequentially connected in series to form a single-phase full-bridge series structure, an outlet of each single-phase full-bridge series structure is connected with a filtering reactor, and the three-phase filtering branches are connected in a delta-type connection mode.
Preferably, each single-phase full-bridge converter unit comprises two converter bridges and a direct-current side capacitor, each converter bridge comprises an upper bridge arm and a lower bridge arm, the positive end of each upper bridge arm is respectively connected with the positive electrode of the direct-current side capacitor, the negative end of each lower bridge arm is respectively connected with the negative electrode of the direct-current side capacitor, the negative end of each upper bridge arm is connected with the positive end of the corresponding lower bridge arm and the alternating-current side outgoing line in parallel, and the alternating-current side outgoing lines of each single-phase full-bridge converter unit of each filtering branch are sequentially connected in series.
Preferably, the secondary system of the active filter comprises a measuring unit, a control calculating unit, a pulse width modulation unit and an auxiliary power supply, wherein the control calculating unit comprises a phase locking module, two fast Fourier calculating modules, 12 k+/-1 proportional integral modules and a clock signal synchronizing module; the measuring unit is used for collecting current signals of a direct current load side of the high-voltage direct current transmission system and an active filter output side in real time and sending the current signals to the control calculation unit so as to realize real-time detection of the state electric quantity of a converting bus of the high-voltage direct current transmission system; the phase locking module is used for following the phase of the alternating current system voltage in the high-voltage direct current transmission system in real time and sending the phase to the fast Fourier computing module; the two fast Fourier calculation modules are used for carrying out fast Fourier analysis on the current signals, extracting 12 k+/-1 times of direct current characteristic harmonic components, and sending differences between the direct current load side current and the corresponding times of direct current characteristic harmonic components of the three-phase filtering branch output side current as input quantities to the corresponding proportional-integral modules; the proportional-integral module is used for realizing dynamic no-difference following of input quantity signals and sending output quantity signals to the clock signal synchronization module; the clock signal synchronization module is used for synchronizing output signals of the proportional-integral modules of all bridge arms in the three-phase filtering branch and then sending the output signals to the pulse width modulation unit; the pulse width modulation unit is used for receiving the output signal of the clock signal synchronization module, converting the output signal into a driving signal of the active filter through a PWM algorithm to enable each single-phase full-bridge converter unit to be conducted, controlling the output waveform of the active filter in real time, and filtering out 12 k+/-1 times of direct current characteristic harmonic current generated by the high-voltage direct current transmission system; the auxiliary power supply is used for providing electric energy for each device of the active filter.
Preferably, the fundamental current component of the fundamental capacitor is determined according to 90% -95% of fundamental voltage of an alternating current system in the high-voltage direct current transmission system.
Preferably, the active filter is a parallel active filter.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the outlet of the active filter is connected with the existing high-voltage direct-current transmission system through the fundamental wave capacitor, so that most of alternating-current system voltage in the existing high-voltage direct-current transmission system is borne by the fundamental wave capacitor, the active filter only bears a small part of fundamental wave voltage and harmonic voltage, the serial number of single-phase full-bridge converter units is greatly reduced, the equipment manufacturing difficulty is reduced, and the equipment investment is saved. 2. The active filter adopts a three-phase delta connection mode, so that the serial number of single-phase full-bridge converter units of each phase of filtering branch can be further reduced, and meanwhile, as the direct-current characteristic harmonic wave does not contain 3k times of harmonic components, the full compensation of the direct-current characteristic harmonic wave can be realized by adopting the three-phase delta connection mode. 3. The control calculation unit arranged by the active filter adopts a fast Fourier algorithm, so that the targeted compensation of the direct current characteristic harmonic waves of fixed times can be realized, the measuring unit can realize the real-time detection of the state electric quantity of the converter bus by collecting the current signals of the direct current load side and the output side of the active filter, the active filter can dynamically filter the direct current characteristic harmonic waves generated by the high-voltage direct current transmission system, and compared with the conventional passive filter adopting characteristic harmonic tuning, the filter can improve the filtering performance and the flexibility, reduce the occupied area of equipment and reduce the risk of series resonance.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a primary system architecture of an active filter in accordance with the present invention;
FIG. 3 is a schematic diagram of a single-phase full-bridge converter unit according to the present invention;
FIG. 4 is a schematic diagram of a secondary system structure of an active filter according to the present invention;
fig. 5 is an internal schematic diagram of the control calculation unit in the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for the purposes of providing a better understanding of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the existing high-voltage direct-current transmission system uses a converter bus as a boundary, one side of the converter bus is connected with an alternating-current system, the other side of the converter bus is connected with primary sides of two direct-current converter transformers in parallel, secondary sides of each direct-current converter transformer are connected with converter valves, the converter valves are of a single-bridge six-pulse structure, the two converter valves are connected in series to form a double-bridge twelve-pulse structure, and outlet sides of the converter valves of the double-bridge twelve-pulse structure are connected with a direct-current overhead line or a cable line through a smoothing reactor. The reactive power compensation equipment is arranged on the converter bus and is used for compensating reactive power consumed by the running of the direct current system, and meanwhile, a filtering device is also required to be arranged on the converter bus and is used for filtering direct current characteristic harmonic current generated by the running of the high-voltage direct current transmission system.
The alternating current active filter for compensating the characteristic harmonic wave of the high-voltage direct current transmission system comprises an active filter 1 and a fundamental wave capacitor 2. The alternating current outgoing line of the active filter 1 is connected with a current converting bus of the existing high-voltage direct current transmission system through a fundamental wave capacitor 2, the fundamental wave capacitor 2 is used for bearing fundamental wave voltage of the high-voltage direct current transmission system, and the active filter 1 is used for filtering direct current characteristic harmonic current generated by current converting of the existing high-voltage direct current transmission system after driving and conducting through internally generated PWM (pulse width modulation) signals.
As shown in fig. 2, the primary system of the active filter 1 includes three-phase filtering branches 31, each phase filtering branch 31 includes a plurality of single-phase full-bridge converter units 32 and a filter reactor 33, the single-phase full-bridge converter units 32 of each phase filtering branch 31 are sequentially connected in series to form a single-phase full-bridge series structure, an outlet of each single-phase full-bridge series structure is connected with the filter reactor 33, and the three-phase filtering branches 31 are connected in a delta-connection manner.
As shown in fig. 3, each single-phase full-bridge converter unit 32 includes two converter bridges 34 and a dc-side capacitor 35, each converter bridge 34 includes an upper bridge arm 341 and a lower bridge arm 342, the positive end of each upper bridge arm 341 is respectively connected to the positive electrode of the dc-side capacitor 35, the negative end of each lower bridge arm 342 is respectively connected to the negative electrode of the dc-side capacitor 35, the negative end of each upper bridge arm 341 is connected in parallel to the positive end of the corresponding lower bridge arm 342 and the ac-side outgoing line, and the ac-side outgoing lines of the single-phase full-bridge converter units 32 of each phase filter branch 31 are sequentially connected in series.
As shown in fig. 4 and 5, the secondary system of the active filter 1 includes a measurement unit 41, a control calculation unit 42, a pulse width modulation unit 43 and an auxiliary power supply 44, wherein the control calculation unit 42 includes a phase lock module 421, two fast fourier calculation modules 422, (12 k±1) proportional integral modules 423 and a clock signal synchronization module 424.
The measurement unit 41 is used for collecting current signals of the direct current load side and the output side of the active filter 1 of the existing high-voltage direct current transmission system in real time and sending the current signals to the control calculation unit 42, so that real-time detection of the state electric quantity of the converter bus is realized.
The phase-lock module 421 is used for following the ac system voltage U in real time c And sent to the fft module 422 to ensure the accuracy of the fft module 422 output current phase. The two fast fourier computation modules 422 are used for performing fast fourier analysis on the current signal, extracting (12 k±1) times of direct current characteristic harmonic components, and converting the direct current load side current i l And the current i at the output side of the three-phase filtering branch 31 c The corresponding order dc characteristic harmonic component differences of (a) are sent as input to the corresponding proportional-integral module 423. The proportional-integral module 423 is configured to dynamically follow the input-quantity signal without difference and send the output-quantity signal to the clock signal synchronization module 424. The clock signal synchronization module 424 is configured to synchronize output signals of the proportional-integral modules of the bridge arms in the three-phase filtering branch 31 and send the output signals to the pulse width modulation unit 43.
The PWM unit 43 is configured to receive the output signal of the clock signal synchronization module 424, convert the output signal into a driving signal of the active filter 1 through a PWM pulse width modulation algorithm, turn on each single-phase full-bridge converter unit 32, control the output waveform of the active filter 1 in real time, and filter out the (12 k±1) times of dc characteristic harmonic current generated by the hvdc transmission system.
The auxiliary power supply 44 is used to supply power to the various components of the active filter 1.
In a preferred embodiment, the fundamental current component of the fundamental capacitor 2 is determined according to 90% -95% of the fundamental voltage of the ac system in the existing hvdc transmission system on the basis of being able to satisfy the basic reactive compensation function of the existing hvdc transmission system.
In a preferred embodiment, the active filter 1 may be a parallel type active filter.
In a preferred embodiment, the active filter 1 may employ a modulation degree of 0.75.
The following describes in detail the use process of the ac active filter for compensating the characteristic harmonic wave of the high-voltage dc transmission system by taking an extra-high voltage dc engineering as an example:
the rated direct current voltage of the extra-high voltage direct current engineering is +/-800 kV, the bipolar rated transmission capacity is 10000MW, each station is composed of two 12 pulsating converters connected in series, the rated voltage of an alternating current system of a transmitting end converter station is 530kV, and when bipolar forward full power transmission is carried out in the extra-high voltage direct current engineering, the maximum value of each harmonic current within 40 times of direct current injection transmitting end converter station is shown in the following table 1:
table 1: direct current injection of each subharmonic current
| Harmonic order | current/A | Harmonic order | current/A | Harmonic order | current/A | Harmonic order | current/A |
| 1 | 12890.59 | 11 | 481.45 | 21 | 11.08 | 31 | 5.17 |
| 2 | 3.03 | 12 | 1.53 | 22 | 0.67 | 32 | 0.43 |
| 3 | 48.76 | 13 | 312.52 | 23 | 124.67 | 33 | 6.83 |
| 4 | 2.64 | 14 | 1.07 | 24 | 0.97 | 34 | 0.43 |
| 5 | 28.03 | 15 | 15.4 | 25 | 102.8 | 35 | 50.52 |
| 6 | 3.25 | 16 | 0.89 | 26 | 0.62 | 36 | 0.5 |
| 7 | 24.59 | 17 | 9.11 | 27 | 9.11 | 37 | 47.91 |
| 8 | 1.94 | 18 | 0.93 | 28 | 0.51 | 38 | 0.41 |
| 9 | 28.86 | 19 | 8.5 | 29 | 5.56 | 39 | 6.21 |
| 10 | 1.51 | 20 | 0.67 | 30 | 0.57 | 40 | 0.38 |
It can be seen that (12 k + -1) times of direct current characteristic harmonic components account for about 85% of the total harmonic content, the direct current characteristic harmonic is treated by adopting the alternating current active filter, firstly, a fundamental wave capacitor 2 is selected, and the fundamental wave voltages at two ends of the fundamental wave capacitor 2 are as follows according to the requirement of bearing 95% of the fundamental wave voltage of a power grid:
and selecting the reactive compensation capacity of the fundamental wave capacitor 2 as 400Mvar, and taking the fundamental wave capacitor 2 as:
the rated voltage of the direct current side capacitor of each single-phase full-bridge current converting unit 32 of the active filter 1 is 2.4kV, the higher single-phase full-bridge current converting unit 32 switching frequency is needed for generating higher harmonics, the number of the single-phase full-bridge current converting units 32 which are connected in series in each phase is set to be 45, the peak values of direct current characteristic harmonic waves in table 1 are assumed to be in the same phase, the maximum harmonic current adopts various harmonic algebra sum superposition, and the peak value of the harmonic current after superposition is:
further, considering the fundamental current component of the fundamental capacitor 2, the maximum current peak value flowing through each phase filtering branch 31 of the active filter 1 is:
the modulation degree of the active filter 1 is usually 0.7-0.8, and the modulation degree of the present invention is 0.75, and the rated capacity of the active filter 1 is:
it can be seen that, since the fundamental voltage of the main ac system is not borne, the rated voltage and the capacity of the present invention are greatly reduced, which is only about half of the capacity of the ac filter group conventionally configured in dc engineering, and the dc characteristic harmonic current injected into the power grid after the present invention is adopted is compared with the following table 2:
table 2: DC characteristic harmonic current contrast
| Harmonic order | 11 th | 13 th | 23 th | 25 th | 35 th | 37 th |
| Original, original | 0.48kA | 0.31kA | 0.12kA | 0.10kA | 0.05kA | 0.05kA |
| Adding APF | 0.008kA | 0.005kA | 0.0006kA | 0.0005kA | 0.0002kA | 0.0001kA |
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (4)
1. The alternating current active filter is used for compensating characteristic harmonic waves of the high-voltage direct current transmission system and is characterized by comprising an active filter and a fundamental wave capacitor;
the alternating current outgoing line of the active filter is connected with the conversion bus of the high-voltage direct current transmission system through the fundamental wave capacitor, the fundamental wave capacitor is used for bearing fundamental wave voltage of the high-voltage direct current transmission system, and the active filter is used for filtering direct current characteristic harmonic current generated by conversion of the high-voltage direct current transmission system after driving and conducting through internally generated PWM (pulse width modulation) signals;
the primary system of the active filter comprises three-phase filtering branches, each phase of the filtering branches comprises a plurality of single-phase full-bridge current converting units, the single-phase full-bridge current converting units of each phase of the filtering branches are sequentially connected in series to form a single-phase full-bridge series structure, an outlet of each single-phase full-bridge series structure is connected with a filtering reactor, and the three-phase filtering branches are connected in a delta-type connection mode;
the secondary system of the active filter comprises a measuring unit, a control computing unit, a pulse width modulation unit and an auxiliary power supply, wherein the control computing unit comprises a phase locking module, two fast Fourier computing modules, 12 k+/-1 proportional integral modules and a clock signal synchronization module;
the measuring unit is used for collecting current signals of a direct current load side of the high-voltage direct current transmission system and an active filter output side in real time and sending the current signals to the control calculation unit so as to realize real-time detection of the state electric quantity of a converting bus of the high-voltage direct current transmission system;
the phase locking module is used for following the phase of the alternating current system voltage in the high-voltage direct current transmission system in real time and sending the phase to the fast Fourier computing module; the two fast Fourier calculation modules are used for carrying out fast Fourier analysis on the current signals, extracting 12 k+/-1 times of direct current characteristic harmonic components, and sending differences between the direct current load side current and the corresponding times of direct current characteristic harmonic components of the three-phase filtering branch output side current as input quantities to the corresponding proportional-integral modules; the proportional-integral module is used for realizing dynamic no-difference following of input quantity signals and sending output quantity signals to the clock signal synchronization module; the clock signal synchronization module is used for synchronizing output signals of the proportional-integral modules of all bridge arms in the three-phase filtering branch and then sending the output signals to the pulse width modulation unit;
the pulse width modulation unit is used for receiving the output signal of the clock signal synchronization module, converting the output signal into a driving signal of the active filter through a PWM algorithm to enable each single-phase full-bridge converter unit to be conducted, controlling the output waveform of the active filter in real time, and filtering out 12 k+/-1 times of direct current characteristic harmonic current generated by the high-voltage direct current transmission system;
the auxiliary power supply is used for providing electric energy for each device of the active filter.
2. The ac active filter for compensating for a characteristic harmonic of a high voltage dc power transmission system according to claim 1, wherein each of said single-phase full-bridge converter units comprises two converter bridges and a dc side capacitor, each of said converter bridges comprises an upper bridge arm and a lower bridge arm, each of said upper bridge arms has a positive terminal connected to said dc side capacitor positive electrode, each of said lower bridge arms has a negative terminal connected to said dc side capacitor negative electrode, each of said upper bridge arms has a parallel connection with said lower bridge arm positive terminal and an ac side outlet, and each of said single-phase full-bridge converter units of each of said filter branches has an ac side outlet connected in series.
3. An ac active filter for compensating for harmonics of a hvdc transmission system according to claim 1, wherein the fundamental current component of said fundamental capacitor is determined in accordance with 90% to 95% of the fundamental voltage of an ac system in said hvdc transmission system.
4. An ac active filter for compensating for harmonics of a hvdc transmission system according to claim 1, wherein said active filter is of a parallel type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710274204.8A CN106998067B (en) | 2017-04-25 | 2017-04-25 | AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710274204.8A CN106998067B (en) | 2017-04-25 | 2017-04-25 | AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106998067A CN106998067A (en) | 2017-08-01 |
| CN106998067B true CN106998067B (en) | 2023-08-22 |
Family
ID=59434366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710274204.8A Active CN106998067B (en) | 2017-04-25 | 2017-04-25 | AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106998067B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347106B (en) * | 2018-11-07 | 2022-02-01 | 国家电网有限公司 | Method and system for evaluating loss of alternating current filter |
| CN109755940A (en) * | 2019-03-19 | 2019-05-14 | 河南理工大学 | A kind of control method of the virtual Active Power Filter-APF of alternating current-direct current mixing micro-capacitance sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070027330A (en) * | 2005-09-06 | 2007-03-09 | 인하대학교 산학협력단 | Single-phase active power filter using rotating reference frame |
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN102170135A (en) * | 2011-04-16 | 2011-08-31 | 湖南大学 | 35KV large capacity reactive compensation and harmonic suppression integrated system and control method thereof |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN102593836A (en) * | 2012-02-24 | 2012-07-18 | 山东德佑电气有限公司 | Active power filter based on full-bridge topology |
| CN104682390A (en) * | 2015-01-22 | 2015-06-03 | 湖南大学 | Alternating current (AC) hybrid active power filter system for high-voltage direct current (DC) transmission, and control method thereof |
-
2017
- 2017-04-25 CN CN201710274204.8A patent/CN106998067B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070027330A (en) * | 2005-09-06 | 2007-03-09 | 인하대학교 산학협력단 | Single-phase active power filter using rotating reference frame |
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN102170135A (en) * | 2011-04-16 | 2011-08-31 | 湖南大学 | 35KV large capacity reactive compensation and harmonic suppression integrated system and control method thereof |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN102593836A (en) * | 2012-02-24 | 2012-07-18 | 山东德佑电气有限公司 | Active power filter based on full-bridge topology |
| CN104682390A (en) * | 2015-01-22 | 2015-06-03 | 湖南大学 | Alternating current (AC) hybrid active power filter system for high-voltage direct current (DC) transmission, and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106998067A (en) | 2017-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3886288A1 (en) | Offshore wind farm high-frequency uncontrolled rectification direct-current electric power transmission system | |
| WO2017152720A1 (en) | Method and apparatus for controlling hybrid direct-current transmission system | |
| CN111740455B (en) | Bus interface converter control method for uniformly compensating alternating-current unbalanced voltage and direct-current pulsating voltage | |
| CN111130088B (en) | Integrated flexible arc extinction method for single-phase earth fault of power distribution network | |
| CN109217687A (en) | Power distribution network electric power electric transformer and its control method based on MMC | |
| CN110086198A (en) | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method | |
| Zhang et al. | Hybrid-frequency cascaded full-bridge solid-state transformer | |
| CN106026154B (en) | The modeling method of extra-high voltage direct-current layer-specific access transmission system | |
| CN111740454B (en) | Mixed micro-grid alternating-current and direct-current voltage unified control method based on bus interface converter | |
| CN109659968B (en) | Electromechanical transient modeling method for distributed access type LCC-MMC (lower control limit-multilevel converter) mixed direct-current system | |
| CN104218573A (en) | Control method of MMC-HVDC (multi media card-high voltage direct current) during power grid malfunction of receiving end | |
| CN110350792A (en) | A kind of power master-slave control method of DC transformer | |
| CN112134472A (en) | Double-end system direct current side resonance control method and system based on MMC current converter | |
| CN110718931A (en) | Novel direct current transmission system suitable for offshore wind power grid connection | |
| CN103023358B (en) | Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier | |
| Guo et al. | Characteristics and performance of Xiamen VSC-HVDC transmission demonstration project | |
| CN110729909A (en) | Multi-port railway power regulator system and comprehensive control method thereof | |
| CN116260348B (en) | MMC-based high-capacity electrolytic hydrogen production hybrid rectifier and control method | |
| CN106998067B (en) | AC active filter for compensating characteristic harmonic wave of high-voltage DC transmission system | |
| CN210007344U (en) | Direct-current ice melting device based on diode rectification and full-bridge MMC current converter | |
| CN110739701A (en) | low-voltage distribution network line low-voltage treatment system and treatment method | |
| CN113595130B (en) | Method and system for online evaluation of dynamic power controllability of direct-current power transmission system | |
| CN109980967A (en) | Reduce the method and system of bridge-type MMC submodule capacitance | |
| Luo et al. | Dividing Frequency Control of Hybrid Active Power Filter With Multi-Injection Branches Using Improved $ i_ {p} $--$ i_ {q} $ Algorithm | |
| CN114785101A (en) | Harmonic group online suppression method and system of single-phase cascade H-bridge converter |
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 |