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CN112491052A - Hybrid filtering device and filtering method - Google Patents

Hybrid filtering device and filtering method Download PDF

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Publication number
CN112491052A
CN112491052A CN202011305300.2A CN202011305300A CN112491052A CN 112491052 A CN112491052 A CN 112491052A CN 202011305300 A CN202011305300 A CN 202011305300A CN 112491052 A CN112491052 A CN 112491052A
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current
active
filtering
harmonic
time
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Chinese (zh)
Inventor
徐群伟
吴俊�
黄弘扬
吕文韬
马智泉
李培
陈�峰
袁敞
邱俊卿
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North China Electric Power University
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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North China Electric Power University
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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Priority to CN202011305300.2A priority Critical patent/CN112491052A/en
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    • 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
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • 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
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/126—Arrangements for reducing harmonics from AC input or output using passive filters
    • 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]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

本发明涉及一种混合型滤波装置及滤波方法。该装置包括无源滤波装置以及有源滤波装置；所述无源滤波装置与所述有源滤波装置分别与换流站500kV交流侧的母线连接；所述有源滤波装置包括：第一主动滤波装置、第二主动滤波装置以及第三主动滤波装置；所述第一主动滤波装置、所述第二主动滤波装置以及所述第三主动滤波装置并联，并均与所述换流站500kV交流侧的母线连接；所述第一主动滤波装置用于进行11次谐波的滤除以及动态无功补偿；所述第二主动滤波装置用于进行13次谐波的滤除以及动态无功补偿；所述第三主动滤波装置用于进行23次谐波的滤除以及动态无功补偿。本发明提高了换流站的交流侧谐波抑制的效果以及稳定性，防止了谐波污染。

Figure 202011305300

The present invention relates to a hybrid filtering device and a filtering method. The device includes a passive filter device and an active filter device; the passive filter device and the active filter device are respectively connected to the busbar of the 500kV AC side of the converter station; the active filter device includes: a first active filter device, a second active filter device and a third active filter device; the first active filter device, the second active filter device and the third active filter device are connected in parallel, and are all connected to the 500kV AC side of the converter station The first active filter device is used for filtering the 11th harmonic and dynamic reactive power compensation; the second active filtering device is used for filtering the 13th harmonic and dynamic reactive power compensation; The third active filtering device is used for filtering the 23rd harmonic and dynamic reactive power compensation. The invention improves the effect and stability of harmonic suppression on the AC side of the converter station, and prevents harmonic pollution.

Figure 202011305300

Description

Hybrid filtering device and filtering method
Technical Field
The invention relates to the field of harmonic suppression on an alternating current side of a converter station, in particular to a hybrid filtering device and a filtering method.
Background
The +/-800 kV extra-high voltage direct current transmission (UHVDC) generally adopts a double 12-pulse current conversion mode, namely a mode of connecting two 12-pulse current converters (namely 4 six-pulse current converters) in series, can realize large-capacity and ultra-long-distance electric energy transmission, and becomes a main technical means for solving the problem of uneven energy and load distribution in China. At present, the ultra-high voltage direct current transmission projects which are put into operation or under construction in China are all ultra-high voltage direct current transmission (LCC-UHVDC) based on a power grid commutation converter, and because the converter adopts a thyristor nonlinear device, 12K +/-1 times of characteristic harmonic waves can be generated on an alternating current side during operation, so that the power quality of a power grid is reduced; the traditional method for inhibiting the harmonic wave generated by the current converter is a passive filter, and the passive filter has a simple structure and is easy to design, so that the passive filter is widely applied.
The conventional method for suppressing harmonics at the ac side of a converter station is to arrange a passive filter near a tuning point of a specific harmonic order, and this filter can effectively suppress the characteristic harmonics generated by the converter, but it also has the following disadvantages:
(1) in order to reduce the change of large reactive power caused by the switching of the passive filters, so that the fluctuation of voltage is caused, the capacity of a single passive filter needs to be set to be small, so that the number of groups of the passive filter is large, and the occupied area is large.
(2) The traditional passive filter may generate series-parallel resonance with the impedance of an alternating current system, so that certain harmonic is amplified, and the electric energy quality of an alternating current power grid is influenced.
(3) Inductance or capacitance of the passive filter can change, so that a tuning point shifts, and partial harmonic waves cannot be filtered.
In summary, the ac side harmonic suppression method in the converter station in the prior art has the above-mentioned drawbacks. Therefore, a new method or device for suppressing harmonics at the ac side of a converter station is needed to solve the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a hybrid filtering device and a hybrid filtering method, which can improve the effect and stability of harmonic suppression on the alternating current side of a converter station and prevent harmonic pollution.
In order to achieve the purpose, the invention provides the following scheme:
a hybrid filtering device, comprising: a passive filter device and an active filter device;
the passive filter device and the active filter device are respectively connected with a bus at the 500kV alternating current side of the converter station;
the active filtering device includes: a first active filtering device, a second active filtering device and a third active filtering device; the first active filtering device, the second active filtering device and the third active filtering device are connected in parallel and are all connected with a bus at the 500kV alternating current side of the converter station;
the first active filtering device is used for filtering 11 th harmonic waves and performing dynamic reactive compensation; the second active filtering device is used for filtering 13 th harmonic waves and performing dynamic reactive compensation; the third active filtering device is used for filtering 23 th harmonic and dynamic reactive compensation.
Optionally, the first active filtering device includes: 11 th harmonic transformers and 11 th active filtering devices; the 11-order harmonic transformer is respectively connected with a bus at the 500kV alternating current side of the converter station and the 11-order active filter device in series;
the second active filtering device includes: 13 th harmonic transformers and 13 th active filtering devices; the 13-order harmonic transformer is respectively connected in series with a bus at the 500kV alternating current side of the converter station and the 13-order active filter device;
the third active filtering device includes: a 23 th harmonic transformer and a 23 rd active filter device; and the 23-time harmonic transformer is respectively connected with a bus at the 500kV alternating current side of the converter station and the 23-time active filter device in series.
Optionally, the 11-time active filtering device, the 13-time active filtering device, and the 23-time active filtering device all adopt an MMC topology structure.
Optionally, the first active filtering device further includes: the harmonic current extraction module of the order 11 and the active filter device control module of the order 11;
the 11-order harmonic current extraction module is respectively connected with the input end of the converter station and the 11-order harmonic transformer; the 11-order harmonic current extraction module is used for extracting 11-order harmonic components in the current of the converter station and the current of the high-voltage side of the 11-order active filter device;
the 11-time active filter device control module is connected with the 11-time harmonic current extraction module and the 11-time active filter device; the 11-time active filter device control module is configured to adjust a current on a high-voltage side of the 11-time active filter device according to an 11-time harmonic component in the current of the converter station and a first current difference value of the current on the high-voltage side of the 11-time active filter device, so that the 11-time harmonic component in the current of the converter station is eliminated.
Optionally, the 11-time active filtering device control module is a PI regulator.
Optionally, the passive filter device includes: a reactive compensation capacitor and a double-tuned filter;
and the reactive compensation capacitor and the double-tuned filter are both connected with a bus at the 500kV alternating current side of the converter station.
A filtering method of a hybrid filtering apparatus, the filtering method being applied to the hybrid filtering apparatus, the filtering method comprising:
acquiring current of a converter station;
performing reactive power compensation and harmonic filtering on the current of the converter station by using a passive filter device to obtain the current of the converter station after primary filtering;
and performing secondary reactive power compensation and secondary harmonic filtering by using an active filtering device according to the current of the converter station subjected to the primary filtering.
Optionally, the performing, according to the current of the converter station after the primary filtering, secondary reactive power compensation and secondary harmonic filtering by using an active filtering device specifically includes:
obtaining 11 th harmonic component, 13 th harmonic component and 23 th harmonic component according to the current of the converter station after the primary filtering;
obtaining the current of the high-voltage side of the 11-time active filter device according to the 11-time harmonic transformer, obtaining the current of the high-voltage side of the 13-time active filter device according to the 13-time harmonic transformer, and obtaining the current of the high-voltage side of the 23-time active filter device according to the 23-time harmonic transformer;
determining a first current difference value according to the 11 th harmonic component and the current of the high-voltage side of the 11 th active filtering device;
determining a second current difference value according to the 13 th harmonic component and the current of the high-voltage side of the 13 th active filtering device;
determining a third current difference value according to the 23 th harmonic component and the current of the high-voltage side of the 23 th active filter device;
and correspondingly adjusting the current of the high-voltage side of the 11-time active filtering device, the current of the high-voltage side of the 13-time active filtering device and the current of the high-voltage side of the 23-time active filtering device according to the first current difference, the second current difference and the third current difference, so that the first current difference, the second current difference and the third current difference are all 0, and further 11-time harmonic component, 13-time harmonic component and 23-time harmonic component in the current of the converter station are eliminated.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a hybrid filtering device and a filtering method, which adopt a passive filtering device and an active filtering device to carry out harmonic filtering and reactive power compensation in a parallel operation mode, and the active filtering device comprises: the first active filtering device, the second active filtering device and the third active filtering device are respectively set based on 11 th harmonic, 13 th harmonic and 23 th harmonic, namely, each active filtering device only inhibits one harmonic, and the capacity of the active filtering devices can be effectively reduced. The invention effectively filters characteristic subharmonic and non-characteristic subharmonic generated by the current converter, reduces the floor area of the filter device, avoids the problem of harmonic amplification caused by resonance of the traditional passive filter and system impedance, reduces the harmonic content at the AC side of the converter station, has certain dynamic reactive power compensation capability, and can reduce the voltage fluctuation caused by switching of the compensation device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a hybrid filter device according to the present invention;
fig. 2 is an internal structural view of the 11-time active filter device, the 13-time active filter device, and the 23-time active filter device;
FIG. 3 is a schematic diagram of a first active filtering apparatus according to the present invention;
FIG. 4 is a schematic diagram of a load harmonic current extraction and active filter control module of the first active filter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a hybrid filtering device and a hybrid filtering method, which can improve the effect and stability of harmonic suppression on the alternating current side of a converter station and prevent harmonic pollution.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a hybrid filter device provided in the present invention, and as shown in fig. 1, the hybrid filter device provided in the present invention includes: passive filter devices and active filter devices.
And the passive filter device and the active filter device are respectively connected with a bus at the 500kV alternating current side of the converter station.
The active filtering device includes: a first active filter device 1, a second active filter device 2 and a third active filter device 3; the first active filtering device 1, the second active filtering device 2 and the third active filtering device 3 are connected in parallel and are all connected with a bus on the 500kV alternating current side of the converter station.
The first active filtering device 1 is used for filtering 11 th harmonic waves and performing dynamic reactive compensation; the second active filtering device 2 is used for filtering 13 th harmonic waves and performing dynamic reactive compensation; the third active filtering device 3 is used for filtering 23 th harmonic and performing dynamic reactive compensation.
As shown in fig. 1, the first active filter device 1 includes: 11 th harmonic transformers and 11 th active filtering devices; and the 11-time harmonic transformer is respectively connected with the bus at the 500kV alternating current side of the converter station and the 11-time active filter device in series. A schematic diagram of a first active filtering device is shown in fig. 3.
The second active filtering device 2 comprises: 13 th harmonic transformers and 13 th active filtering devices; and the 13-time harmonic transformer is respectively connected with the bus at the 500kV alternating current side of the converter station and the 13-time active filter device in series.
The third active filtering means 3 comprise: a 23 th harmonic transformer and a 23 rd active filter device; and the 23-time harmonic transformer is respectively connected with a bus at the 500kV alternating current side of the converter station and the 23-time active filter device in series.
The 11-time active filtering device, the 13-time active filtering device and the 23-time active filtering device all adopt an MMC topology structure, and as shown in fig. 2, the three-phase active filtering device comprises a three-phase rectifier bridge, and each bridge arm comprises a plurality of sub-modules.
As shown in fig. 4, the first active filter device 1 further includes: 11 th harmonic current extraction module and 11 th active filter device control module.
The 11-order harmonic current extraction module is respectively connected with the input end of the converter station and the 11-order harmonic transformer; the 11-th harmonic current extraction module is used for extracting 11-th harmonic components in the current of the converter station and the current of the high-voltage side of the 11-th active filtering device.
The 11-time active filter device control module is connected with the 11-time harmonic current extraction module and the 11-time active filter device; the 11-time active filter device control module is configured to adjust a current on a high-voltage side of the 11-time active filter device according to an 11-time harmonic component in the current of the converter station and a first current difference value of the current on the high-voltage side of the 11-time active filter device, so that the 11-time harmonic component in the current of the converter station is eliminated.
And the control module of the 11-time active filtering device is a PI regulator.
The passive filtering device includes: a reactive compensation capacitor 4 and a double tuned filter 5.
And the reactive compensation capacitor 4 and the double-tuned filter 5 are both connected with a bus at the 500kV alternating current side of the converter station.
Similarly, the second active filtering device 2 further includes: a 13 th harmonic current extraction module and a 13 th active filter control module.
The third active filtering means 3 further comprise: a 23 th harmonic current extraction module and a 23 rd active filter control module.
As a specific embodiment, taking 11 th harmonic filtering as an example, the filtering process is explained:
detecting the load current (current of the converter station) iL11 th harmonic component i inL11And sent to the 11-time active filter control module as the reference current.
Obtaining the current i of the high-voltage side of the branch where the 11-time active filter device is positionedF11The 11 th harmonic current i detected from the load currentL11And iF11The difference is sent to a PI regulator.
PI regulator pass iL11And iF11Continuously adjusting the output voltage u of the active filter device according to the difference resultF11Thereby regulating the current i of the high-voltage side of the active filter deviceF11Up to iL11And iF11Is 0;
current i generated by 11 times active filter deviceF11Injected into the system, with the 11 th harmonic current component i in the loadL11The harmonic currents are mutually counteracted, so that the 11 th harmonic current generated by the load cannot flow into the system current;
13. the suppression principle of the 23 th harmonic is the same as that of the 11 th harmonic.
The filtering method of the hybrid filtering device provided by the invention is applied to the hybrid filtering device, and comprises the following steps:
s1, obtaining the current of the converter station.
And S2, performing reactive power compensation and harmonic filtering on the current of the converter station by using a passive filter device to obtain the current of the converter station after primary filtering.
And S3, performing secondary reactive power compensation and secondary harmonic filtering by using an active filter device according to the current of the converter station after the primary filtering.
S3 specifically includes:
and S301, acquiring 11 th harmonic component, 13 th harmonic component and 23 rd harmonic component according to the current of the converter station after the primary filtering.
And S302, acquiring the current of the high-voltage side of the 11-time active filter device according to the 11-time harmonic transformer, acquiring the current of the high-voltage side of the 13-time active filter device according to the 13-time harmonic transformer, and acquiring the current of the high-voltage side of the 23-time active filter device according to the 23-time harmonic transformer.
And S303, determining a first current difference value according to the 11 th harmonic component and the current of the high-voltage side of the 11 th-order active filtering device.
S304, determining a second current difference value according to the 13 th harmonic component and the current of the high-voltage side of the 13 th active filter device.
And S305, determining a third current difference value according to the 23 th harmonic component and the current of the high-voltage side of the 23-time active filter device.
S306, correspondingly adjusting the current of the high-voltage side of the 11-time active filter device, the current of the high-voltage side of the 13-time active filter device, and the current of the high-voltage side of the 23-time active filter device according to the first current difference, the second current difference, and the third current difference, so that the first current difference, the second current difference, and the third current difference are all 0, and further, the 11 th harmonic component, the 13 th harmonic component, and the 23 th harmonic component in the current of the converter station are all eliminated.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A hybrid filtering device, comprising: a passive filter device and an active filter device;
the passive filter device and the active filter device are respectively connected with a bus at the 500kV alternating current side of the converter station;
the active filtering device includes: a first active filtering device, a second active filtering device and a third active filtering device; the first active filtering device, the second active filtering device and the third active filtering device are connected in parallel and are all connected with a bus at the 500kV alternating current side of the converter station;
the first active filtering device is used for filtering 11 th harmonic waves and performing dynamic reactive compensation; the second active filtering device is used for filtering 13 th harmonic waves and performing dynamic reactive compensation; the third active filtering device is used for filtering 23 th harmonic and dynamic reactive compensation.
2. The hybrid filtering device as claimed in claim 1, wherein the first active filtering device comprises: 11 th harmonic transformers and 11 th active filtering devices; the 11-order harmonic transformer is respectively connected with a bus at the 500kV alternating current side of the converter station and the 11-order active filter device in series;
the second active filtering device includes: 13 th harmonic transformers and 13 th active filtering devices; the 13-order harmonic transformer is respectively connected in series with a bus at the 500kV alternating current side of the converter station and the 13-order active filter device;
the third active filtering device includes: a 23 th harmonic transformer and a 23 rd active filter device; and the 23-time harmonic transformer is respectively connected with a bus at the 500kV alternating current side of the converter station and the 23-time active filter device in series.
3. A hybrid filtering device according to claim 2, wherein the 11-time active filtering device, the 13-time active filtering device and the 23-time active filtering device all adopt MMC topology.
4. The hybrid filtering device as claimed in claim 2, wherein the first active filtering device further comprises: the harmonic current extraction module of the order 11 and the active filter device control module of the order 11;
the 11-order harmonic current extraction module is respectively connected with the input end of the converter station and the 11-order harmonic transformer; the 11-order harmonic current extraction module is used for extracting 11-order harmonic components in the current of the converter station and the current of the high-voltage side of the 11-order active filter device;
the 11-time active filter device control module is connected with the 11-time harmonic current extraction module and the 11-time active filter device; the 11-time active filter device control module is configured to adjust a current on a high-voltage side of the 11-time active filter device according to an 11-time harmonic component in the current of the converter station and a first current difference value of the current on the high-voltage side of the 11-time active filter device, so that the 11-time harmonic component in the current of the converter station is eliminated.
5. A hybrid filter device as claimed in claim 4, wherein the 11-time active filter device control module is a PI regulator.
6. A hybrid filtering device as claimed in claim 1, wherein the passive filtering device comprises: a reactive compensation capacitor and a double-tuned filter;
and the reactive compensation capacitor and the double-tuned filter are both connected with a bus at the 500kV alternating current side of the converter station.
7. A filtering method of a hybrid filtering apparatus, wherein the filtering method is applied to the hybrid filtering apparatus of any one of claims 1 to 6, and the filtering method comprises:
acquiring current of a converter station;
performing reactive power compensation and harmonic filtering on the current of the converter station by using a passive filter device to obtain the current of the converter station after primary filtering;
and performing secondary reactive power compensation and secondary harmonic filtering by using an active filtering device according to the current of the converter station subjected to the primary filtering.
8. The filtering method of the hybrid filtering device according to claim 7, wherein performing secondary reactive power compensation and secondary harmonic filtering by using an active filtering device according to the current of the converter station after the primary filtering specifically includes:
obtaining 11 th harmonic component, 13 th harmonic component and 23 th harmonic component according to the current of the converter station after the primary filtering;
obtaining the current of the high-voltage side of the 11-time active filter device according to the 11-time harmonic transformer, obtaining the current of the high-voltage side of the 13-time active filter device according to the 13-time harmonic transformer, and obtaining the current of the high-voltage side of the 23-time active filter device according to the 23-time harmonic transformer;
determining a first current difference value according to the 11 th harmonic component and the current of the high-voltage side of the 11 th active filtering device;
determining a second current difference value according to the 13 th harmonic component and the current of the high-voltage side of the 13 th active filtering device;
determining a third current difference value according to the 23 th harmonic component and the current of the high-voltage side of the 23 th active filter device;
and correspondingly adjusting the current of the high-voltage side of the 11-time active filtering device, the current of the high-voltage side of the 13-time active filtering device and the current of the high-voltage side of the 23-time active filtering device according to the first current difference, the second current difference and the third current difference, so that the first current difference, the second current difference and the third current difference are all 0, and further 11-time harmonic component, 13-time harmonic component and 23-time harmonic component in the current of the converter station are eliminated.
CN202011305300.2A 2020-11-20 2020-11-20 Hybrid filtering device and filtering method Pending CN112491052A (en)

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