CN112436515A - Novel hybrid active filter and control method - Google Patents

Novel hybrid active filter and control method Download PDF

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Publication number
CN112436515A
CN112436515A CN202010564447.7A CN202010564447A CN112436515A CN 112436515 A CN112436515 A CN 112436515A CN 202010564447 A CN202010564447 A CN 202010564447A CN 112436515 A CN112436515 A CN 112436515A
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active filter
filter
port
voltage
module
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李建林
周喜超
王力
谭宇良
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North China University of Technology
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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
    • H02J3/36—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
    • Y02E40/40—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

The invention relates to a novel hybrid active filter and a control method. The system comprises a passive filter module and an active filter module, and the novel battery system is formed by directly connecting the passive filter module and the active filter module in series. The passive filter module is used for bearing fundamental voltage of a power grid, the active filter module is used for compensating harmonic current, and the problem that the traditional filter-free filter is large in occupied area and easy to cause a resonance curve with alternating current system impedance can be solved, so that the voltage grade suitable for the active filter device is greatly improved.

Description

Novel hybrid active filter and control method
Technical Field
The invention relates to the field of novel battery design, in particular to a novel hybrid active filter and a control method.
Background
The direct current system is used as an important harmonic source in an alternating current power grid, a 12-pulse valve group is generally adopted by a converter valve, and a large amount of harmonic waves are generated along with the rapid switching of a switching valve in the working process of the converter valve, so that the quality of power supply is greatly influenced. The function of the converter determines that a large amount of harmonic waves are generated in the process of converting current and are injected into an alternating current system to cause distortion of an alternating current power grid. At present, the conventional way for managing the harmonic waves generated by the LCC-HVDC system and injected into the AC power grid is to add a passive filter at the AC bus of the converter station, and although the scheme can solve the problem of injecting the harmonic waves into the power grid to a greater extent, the passive filter has the inherent defects: the floor space of the filter equipment and the reactive power compensation device occupies 1/3 of the total area of the converter station, and is one of the most important floor space costs in the converter station; the filtering effect of the passive filter is closely related to the impedance characteristic of the alternating current system, resonance can be caused under certain frequency, and harmonic pollution of the alternating current system is aggravated; meanwhile, the parameters of the elements and devices of the passive filter change along with time, so that the tuning point shifts, and the filtering effect is influenced.
Disclosure of Invention
The invention aims to provide a novel hybrid active filter and a control method, which can solve the problems that the traditional filter-free filter has large floor area and is easy to cause a resonance curve with alternating current system impedance.
In order to achieve the purpose, the invention provides the following scheme:
a novel hybrid active filter comprising: the passive filter comprises an active filter module and a passive filter module, wherein the active filter module and the passive filter module are connected in series.
Optionally, the active filter module is based on a cascade H-bridge structure, and the active filter module includes n cascade subsystems, each of which includes an inductor and a cascade submodule connected in series with the inductor.
Optionally, each cascaded submodule includes 4 IGBTs, each two IGBTs form a bridge arm by being connected in series, a collector of each IGBT is connected with an emitter of the other IGBT, the two bridge arms of the cascaded submodule are connected in parallel to form two common ends, the common end of the emitter is connected with an anode of a battery, the common end of the collector is connected with a cathode of the battery, an interface of the cascaded submodule is led out from each group of bridge arms, and a lead-out port is located between the emitter of the IGBT above and the collector of the IGBT below; each cascade submodule is formed by serially connecting the same number of H-bridge modules together, one end of each cascade submodule is connected with an inductor in series and then is interconnected to form a common end which is marked as a first port, and the first port is connected with the passive filter module; and the other end of the cascade submodule forms another common end which is marked as a second port through interconnection.
Optionally, the passive filtering module adopts 12/24-time single-tuned filters.
Optionally, the 12/24-time single-tuned filter includes a group of 12-time single-tuned filters and 24-time single-tuned filters connected in parallel, each of the 12-time single-tuned filters and the 24-time single-tuned filters includes a capacitor and an inductor, the capacitor and the inductor are connected in series, one end of the capacitor connected in parallel is marked as a third port, the third port is connected with the three-phase ac output end, one end of the inductor connected in parallel is marked as a fourth port, and the second port is connected with the first port.
A control method of a cascade H bridge related to an active filter module comprises the following steps:
obtaining AC voltage u of power gridsEquivalent impedance Z of passive filter branchfBranch current i of passive filterfAnd load side current iL；
The power grid alternating voltage usObtaining a power grid voltage phase angle theta through a PLL (phase locked loop); the phase angle is used for Park transformation and Park inverse transformation;
the load side current iLAnd the passive filter branch current ifRespectively obtaining dq axis components i through Park conversionLd、iLq、ifdAnd ifq(ii) a Each of said components is then passed through a high pass filter to obtain the dq component i of the k-th harmonicLdk、iLqk、ifdkAnd ifqkAnd obtaining a k-th harmonic static coordinate system component i through Park inverse transformationLkAnd ifk(ii) a Will iLkAnd ifkA transfer function G after difference making and passing through the quasi-proportional resonant controllerAObtaining an output voltage u 'of the active filter'fk；
Detecting the voltage of the direct current side of the sub-module in the n groups of bridge arms of the active filter module, and respectively recording the voltage as udca1、udca2…udcam，udcb1、udcb2…udcbmAnd udcc1、udcc2…udccm(ii) a Respectively recording the average value of the direct current voltage of each group of sub-modules as udcA、udcBAnd udcC(ii) a By udcRepresenting the average value of the direct-current side voltages of all the submodules in the active filter; will udcAfter passing through a low-pass filter, is compared with the average rated voltage udc *Making difference, and performing reverse Pack transformation after a PI link to obtain u'dcPrepared from u'fkAnd u'dcAdding to obtain the output voltage u of the AC side of the active filterf(ii) a Will ufObtaining the modulation wave m of the ith H bridge in each group of bridge arms through a low-pass filterai、mbi、mci；
Each of the modulated waves mai、mbi、mciAnd the N cascade submodules are respectively applied to the n cascade submodules of the active filtering module.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the novel battery system comprises a passive filter module and an active filter module which are directly connected in series. The passive filter module is used for bearing fundamental voltage of a power grid, the active filter module is used for compensating harmonic current, and the defect that the traditional filter-free device is large in occupied area and easy to cause a resonance curve with alternating current system impedance can be solved, so that the voltage grade suitable for the hybrid active filter device is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 creative efforts.
FIG. 1 is a schematic diagram of the novel hybrid active filter of the present invention;
FIG. 2 is a diagram of the access mode and topology structure of the novel hybrid active filter according to the present invention;
FIG. 3 is a topological diagram of the internal structure of the cascaded sub-module of the present invention;
FIG. 4 is a flow chart illustrating a cascade subsystem control strategy according to the present invention;
fig. 5 is a block diagram of the H-bridge modulation wave control according to the present invention.
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 novel hybrid active filter and a control method, which can solve the problems that the traditional filter-free filter has large floor area and is easy to cause a resonance curve with alternating current system impedance.
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 diagram of the novel hybrid active filter according to the present invention. As shown in fig. 1, a novel hybrid active filter includes: the device comprises an active filtering module 1 and a passive filtering module 2, wherein the active filtering module and the passive filtering module 2 are connected in series. The active filter module 1 is based on a cascade H-bridge structure, the active filter module 1 comprises n cascade subsystems, and each cascade subsystem comprises an inductor and a cascade submodule connected with the inductor in series. Each cascade submodule comprises 4 IGBTs, each two IGBTs form a bridge arm through series connection, a collector of each IGBT is connected with an emitter of the other IGBT, the two bridge arms of each cascade submodule are connected in parallel to form two common ends, the common end of each emitter is connected with an anode of a battery, the common end of each collector is connected with a cathode of the battery, an interface of each cascade submodule is led out from each group of bridge arms, and a lead-out port is positioned between the emitter of the IGBT above and the collector of the IGBT below; each cascade submodule is formed by serially connecting the same number of H-bridge modules together, one end of each cascade submodule is connected with an inductor in series and then is interconnected to form a common end which is marked as a first port, and the first port is connected with the passive filter module 2; and the other end of the cascade submodule forms another common end which is marked as a second port through interconnection.
The passive filtering module 2 adopts 12/24 times of single-tuned filters. The 12/24 time single tuned filter comprises a group of 12 time single tuned filters and 24 time single tuned filters which are connected in parallel, wherein each of the 12 time single tuned filters and the 24 time single tuned filters comprises a capacitor and an inductor, the capacitors and the inductors are connected in series, one end of each capacitor connected in parallel is marked as a third port, the third port is connected with a three-phase alternating current output end, one end of each inductor connected in parallel is marked as a fourth port, and the second port is connected with the first port.
The novel hybrid active filter of the present invention is described in detail below with reference to the accompanying drawings.
Fig. 2 is a diagram of the access mode and topology structure of the novel hybrid active filter of the present invention. The structure of the invention is as follows: 12/24 Single coordinated Passive filters, active filters based on a cascaded H-bridge topology are connected in series. The passive filter is formed by connecting a 12-time single-coordination filter and a 24-time single-coordination filter in parallel, one end of the passive filter after the parallel connection is marked as a port a and connected with a three-phase alternating current output end (power grid), the other end of the passive filter is marked as a port b, and the passive filter is connected with a common end c of the active filter in series; the active filter is formed by connecting n groups of bridge arms in parallel, each group of bridge arms is formed by connecting a plurality of sub-modules in series, and the bridge arms are accessed between a power grid and a harmonic source (load) through a port a of the passive filter. Each group of cascade submodules is formed by serially connecting the same number of H-bridge modules together, and one end of each cascade submodule is interconnected to form a common end which is marked as a port c and is connected to a passive filter after being serially connected with an inductor; the other end also forms another common end, denoted as port d, by interconnection.
Fig. 3 is a topological diagram of the internal structure of the cascaded submodule according to the present invention. Each submodule consists of 4 IGBTs, two IGBTs numbered 1 and 4 are connected in series to form a bridge arm, and a collector of the IGBT 1 is connected with an emitter of the IGBT 4; and the collector of the IGBT No. 3 is connected with the emitter of the IGBT No. 2. Two bridge arms of the submodule are connected in parallel to form two public ends, then the public ends of the emitting electrodes of the IGBTs No. 1 and No. 3 are connected with the anode of the battery, and the public ends of the collecting electrodes of the IGBTs No. 4 and No. 2 are connected with the cathode of the battery. The leading-out range of a first interface of the sub-module is between an emitter of the IGBT 1 and a collector of the IGBT 4, and the leading-out range of a second interface of the sub-module is between an emitter of the IGBT 3 and a collector of the IGBT 2. Each group of cascade submodules is formed by serially connecting the same number of H-bridge modules together, one end of each cascade submodule is connected with an inductor in series and then is interconnected to form a common end and then is connected to a passive filter, and the other end of each cascade submodule is also connected with another common end through interconnection.
Fig. 4 is a schematic flow chart of the cascade subsystem control strategy of the present invention. The general idea is as follows: input grid current iLOutput current i of hybrid active filterfAnd the average voltage u of the DC side batterydcAnd a set target current-side average voltage u* dc. By averaging the voltage u on the DC sidefAnd finally, the compensation of the hybrid active filter on harmonic current in the power grid is realized. The invention protects a control method of a cascade H bridge related to an active filter module, which comprises the following steps:
step 101: obtaining AC voltage u of power gridsEquivalent impedance Z of passive filter branchfBranch current i of passive filterfAnd load side current iL；
Step 102: the power grid alternating voltage usObtaining a power grid voltage phase angle theta through a PLL (phase locked loop); the phase angle is used for Park transformation and Park inverse transformation;
step 103: the load side current iLAnd the passive filter branch current ifRespectively obtaining dq axis components i through Park conversionLd、iLq、ifdAnd ifq(ii) a Each of said components is then passed through a high pass filter to obtain the dq component i of the k-th harmonicLdk、iLqk、ifdkAnd ifqkAnd obtaining a k-th harmonic static coordinate system component i through Park inverse transformationLkAnd ifk(ii) a Will iLkAnd ifkA transfer function G after difference making and passing through the quasi-proportional resonant controllerAObtaining an output voltage u 'of the active filter'fk；
Step 104: detecting the voltage of the direct current side of the sub-module in the n groups of bridge arms of the active filter module, and respectively recording the voltage as udca1、udca2…udcam，udcb1、udcb2…udcbmAnd udcc1、udcc2…udccm(ii) a Respectively recording the average value of the direct current voltage of each group of sub-modules as udcA、udcBAnd udcC(ii) a By udcRepresenting the average value of the direct-current side voltages of all the submodules in the active filter; will udcAfter passing through a low-pass filter, is compared with the average rated voltage udc *Making difference, and performing reverse Pack transformation after a PI link to obtain u'dcPrepared from u'fkAnd u'dcAdding to obtain the output voltage u of the AC side of the active filterf(ii) a Will ufObtaining the modulation wave m of the ith H bridge in each group of bridge arms through a low-pass filterai、mbi、mci。
Taking the number of cascaded sub-modules equal to 3 as an example, the average voltage on the direct current side is calculated by the following formula:
Figure BDA0002547312900000061
Figure BDA0002547312900000062
Figure BDA0002547312900000063
Figure BDA0002547312900000064
in the formula udca1、udca2、udca3；udcb1、udcb2、udcb3；udcc1、udcc2、udcc3Respectively representing the voltage of the direct current side of the sub-modules in the n groups of bridge arms of the active filter; u. ofdcA、udcBAnd udcCRespectively representing the average value of the direct current voltage of each group of sub-modules; u. ofdcThe average value of the dc side voltage of all the submodules in the active filter is shown.
The transfer functions of the 4 quasi-proportional resonant controllers are respectively:
Figure BDA0002547312900000065
Figure BDA0002547312900000066
Figure BDA0002547312900000067
Figure BDA0002547312900000068
wherein, KpDenotes the proportionality coefficient, KIRepresenting the integral coefficient, ωcRepresenting the cut-off frequency, ω0Representing the fundamental angular frequency.
Fig. 5 is a block diagram of the H-bridge modulation wave control according to the present invention. Input active filter AC side output voltage ufVoltage u at DC side of sub-module in 3 groups of arms of active filterdca1、udca2、udca3；udcb1、udcb2、udcb3；udcc1、udcc2、udcc3。ufObtaining fundamental wave u of output voltage at AC side of active filter by a low-pass filterf0Disclosure of the inventionObtaining the modulation wave m of the ith H bridge in each group of bridge arms by the over-modulation wave calculation modelai、mbi、mci。
Figure BDA0002547312900000071
Figure BDA0002547312900000072
Figure BDA0002547312900000073
Step 105: each of the modulated waves mai、mbi、mciAnd the N cascade submodules are respectively applied to the n cascade submodules of the active filtering module.
Detecting the SOC from the battery system to obtain the SOC of the battery in the ith sub-module in the 3 groups of bridge arms of the active filterai、SOCbi、SOCci. And outputting a judgment logic result 0 or 1 through an SOC protection judgment link. And (3) judging a rule: when the SOC exceeds the protection interval, outputting logic 0; and when the SOC does not exceed the protection interval, outputting logic 1. Specific SOC judgment rules: when the SOC of the battery system is larger than 0.9, outputting a logic value 0, stopping charging the battery system, and when power compensation is needed on the power grid side, outputting a logic value 1, and providing power compensation for the battery system; when the SOC of the battery system is less than 0.1, outputting a logic value 0, stopping discharging the battery pack, and when power absorption is needed on the power grid side, outputting a logic value 1, and providing power absorption by the battery system; when the SOC is more than 0.1 and less than 0.8, the output logic value is constant to be 1, and the battery system compensates or absorbs power according to the requirement of the power grid side. Will SOCaiAnd the judgment result of (1) and the modulation wave m of the ith H bridge in the bridge armaiPerforming logic AND and outputting modulated wave maiSimilarly, using SOCbiAnd mbi、SOCciAnd mciTo obtain mbi、mci。
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.
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 (6)

1. A novel hybrid active filter, comprising: the passive filter comprises an active filter module and a passive filter module, wherein the active filter module and the passive filter module are connected in series.
2. The novel hybrid active filter of claim 1, wherein said active filter module is based on a cascaded H-bridge structure, said active filter module comprising n cascaded subsystems, each of said cascaded subsystems comprising an inductor and a cascaded submodule in series with said inductor.
3. The novel hybrid active filter according to claim 2, wherein each of the cascaded submodules comprises 4 IGBTs, each two IGBTs form a bridge arm by being connected in series, the collector of the IGBT is connected with the emitter of the other IGBT, the two bridge arms of the cascaded submodule are connected in parallel to form two common terminals, the common terminal of the emitter is connected with the anode of the battery, the common terminal of the collector is connected with the cathode of the battery, the interface of the cascaded submodule is led out from each bridge arm, and the lead-out port is located between the emitter of the IGBT above and the collector of the IGBT below; each cascade submodule is formed by serially connecting the same number of H-bridge modules together, one end of each cascade submodule is connected with an inductor in series and then is interconnected to form a common end which is marked as a first port, and the first port is connected with the passive filter module; and the other end of the cascade submodule forms another common end which is marked as a second port through interconnection.
4. A novel hybrid active filter as claimed in claim 3, characterized in that the passive filtering module employs 12/24-fold single-tuned filters.
5. The novel hybrid active filter according to claim 4, wherein the 12/24-time single-tuned filter comprises a set of 12-time single-tuned filters and 24-time single-tuned filters connected in parallel, each of the 12-time single-tuned filters and the 24-time single-tuned filters includes a capacitor and an inductor, the capacitor and the inductor are connected in series, one end of the capacitor connected in parallel is denoted as a third port, the third port is connected to a three-phase ac output terminal, one end of the inductor connected in parallel is denoted as a fourth port, and the second port is connected to the first port.
6. A method for controlling a cascaded H-bridge related to an active filter module is characterized by comprising the following steps:
obtaining AC voltage u of power gridsEquivalent impedance Z of passive filter branchfBranch current i of passive filterfAnd load side current iL；
The power grid alternating voltage usObtaining a power grid voltage phase angle theta through a PLL (phase locked loop); the phase angle is used for Park transformation and Park inverse transformation;
the load side current iLAnd the passive filter branch current ifRespectively obtaining dq axis components i through Park conversionLd、iLq、ifdAnd ifq(ii) a Each of said components is then passed through a high pass filter to obtain the dq component i of the k-th harmonicLdk、iLqk、ifdkAnd ifqkAnd obtaining a k-th harmonic static coordinate system component i through Park inverse transformationLkAnd ifk(ii) a Will iLkAnd ifkA transfer function G after difference making and passing through the quasi-proportional resonant controllerAObtaining an output voltage u 'of the active filter'fk；
Detecting the voltage of the direct current side of the sub-module in the n groups of bridge arms of the active filter module, and respectively recording the voltage as udca1、udca2…udcam，udcb1、udcb2…udcbmAnd udcc1、udcc2…udccm(ii) a Respectively recording the average value of the direct current voltage of each group of sub-modules as udcA、udcBAnd udcC(ii) a By udcRepresenting the average value of the direct-current side voltages of all the submodules in the active filter; will udcAfter passing through a low-pass filter, is compared with the average rated voltage udc *Making difference, and performing reverse Pack transformation after a PI link to obtain u'dcPrepared from u'fkAnd u'dcAdding to obtain the output voltage u of the AC side of the active filterf(ii) a Will ufObtaining the modulation wave m of the ith H bridge in each group of bridge arms through a low-pass filterai、mbi、mci；
Each of the modulated waves mai、mbi、mciAnd the N cascade submodules are respectively applied to the n cascade submodules of the active filtering module.
CN202010564447.7A 2020-06-19 2020-06-19 Novel hybrid active filter and control method Pending CN112436515A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103956738A (en) * 2014-04-23 2014-07-30 国家电网公司 Control method for battery energy storage system with both function of APF and function of SVG

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103956738A (en) * 2014-04-23 2014-07-30 国家电网公司 Control method for battery energy storage system with both function of APF and function of SVG

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
余攀 等: ""级联H桥混合型有源电力滤波器直流电压控制"", 《中国电机工程学报》 *
李双健 等: ""一种应用于LCC高压直流输电的级联H桥混合型有源滤波器"", 《电网技术》 *

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