CN107221931A - Z-source inverter grid-connected control method based on Active Power Filter-APF - Google Patents
Z-source inverter grid-connected control method based on Active Power Filter-APF Download PDFInfo
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- CN107221931A CN107221931A CN201710427396.1A CN201710427396A CN107221931A CN 107221931 A CN107221931 A CN 107221931A CN 201710427396 A CN201710427396 A CN 201710427396A CN 107221931 A CN107221931 A CN 107221931A
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- 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
- Y02E40/20—Active power filtering [APF]
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Abstract
The present invention relates to a kind of Z-source inverter grid-connected control method based on Active Power Filter-APF, direct voltage sourceIt is connected in parallel on Z-source inverter, line inductance is passed through in Z-source inverter outputGet access to grid and load, line inductanceThere is parallel connection type active electric filter APF between power network, grid-connected current is filtered using Active Power Filter-APF APF, harmonic current is detected using Instantaneous Power Theory, extract and separate the idle harmonious wave component in electric current, and harmonic current is compensated and tracing control, grid-connected current quality can be effectively improved, harmonic pollution is administered；The addition of Voltage loop can effectively maintain the stability of system voltage, and the addition of electric current loop can realize that unity power factor is grid-connected, and the control method can effectively improve the quality and power factor of grid-connected current on the premise of ensureing that system is stable.The rapidity of system is also improved, robustness enhancing.
Description
Technical field
The present invention relates to a kind of power control technology, more particularly to a kind of Z-source inverter based on Active Power Filter-APF
Grid-connected control method.
Background technology
It is increasingly serious with global energy crisis and problem of environmental pollution, regenerative resource (wind energy, solar energy etc.)
Distributed generation system capacity shared in power network persistently increases.Most of distributed energies are required for accessing by inverter
Power network, therefore, adverser control technology become particularly important.Meanwhile, the extensive access of new energy and adding for process of industrialization
It hurry up, a large amount of non-linear, impact loads are continued to bring out, and the harmonic current produced by these loads makes the quality of power supply go from bad to worse.
Traditional voltage source inverter is voltage-dropping type inverter, input voltage is relatively low or during larger fluctuation range, need to be
Prime adds booster circuit, and this can make it that the structure of system becomes complicated, inversion efficiency is greatly lowered.In addition, conventional inverter
Two power tubes up and down of same bridge arm can not be simultaneously turned on, and otherwise can be caused short circuit, be burnt component.Z-source inverter due to
X-type impedance network is introduced, conventional inverter can be effectively overcome the shortcomings of.One side Z-source inverter is using on same bridge arm
The straight-through of lower power tube realizes boost function, therefore is a kind of buck-boost inverter.On the other hand, one kind is become due to straight-through
Special mode of operation, the pass-through state caused by electromagnetic interference etc. will not damage inverter, and can avoid by dead time
Caused output waveform distortion.
A large amount of accesses of nonlinear load can cause among substantial amounts of higher hamonic wave injection power network, in addition, to Z-source inverter
Current control under the high-frequency pulsed width modulation of use can also produce substantial amounts of higher hamonic wave, and traditional passive wave filter can not be protected already
Demonstrate,prove preferable networking current quality.
The content of the invention
The problem of causing substantial amounts of higher hamonic wave injection power network the present invention be directed to a large amount of accesses of nonlinear load, carry
A kind of Z-source inverter grid-connected control method based on Active Power Filter-APF is gone out, tradition is made up by introducing Z-source inverter
The defect that inverter can not lead directly to, boost, to the harmonic wave of grid-connected current filter out while may be used also using Active Power Filter-APF
To carry out reactive-load compensation to system.The control method can effectively improve grid-connected current on the premise of ensureing that system is stable
Quality and power factor.The rapidity of system is also improved, robustness enhancing.
The technical scheme is that：A kind of Z-source inverter grid-connected control method based on Active Power Filter-APF, direct current
Voltage source VdcIt is connected in parallel on Z-source inverter, Z-source inverter output is by line inductance LiGet access to grid and load, line inductance Li
There is parallel connection type active electric filter APF between power network, cutting-in control part includes Z sources capacitance voltage detection transmitter, net
Side current detecting transmitter, net side detecting voltage by three phase transmitter, three-phase power grid voltage phaselocked loop, single-phase mains voltage lock phase
Ring, low pass filter, voltage on line side are transformed into by three-phase static coordinate system the first module of two-phase rotating coordinate system, by net side
Electric current is transformed into the second module of two-phase rotation by three-phase static coordinate system, and voltage is changed into three by two-phase rotating coordinate system contravariant
3rd module of phase rest frame, electric current is changed to by two-phase rotating coordinate system contravariant the 4th mould of three-phase static coordinate system
Block, PI controllers and two SPWM modules for being used to produce modulated drive signal；
Z-source inverter control method：
1) voltage detecting transmitter collection three-phase grid voltage ua、ub、uc, on the one hand this three-phase voltage is sent to three-phase electricity
Press phaselocked loop to gather the grid-connected angle ω t of three-phase grid voltage, three-phase voltage and grid-connected angle ω t are on the other hand sent to first
Module, by the voltage conversion under three-phase static coordinate system into the voltage u under two-phase rotating coordinate systemd、uq；
2) three-phase current detection transmitters sense three-phase grid electric current i is utilizeda、ib、ic, by this three-phase current and grid-connected angle
Degree ω t are sent to the second module, and the electric current under three-phase static coordinate system is converted into the electric current i under two-phase rotating coordinate systemd、iq；
3) voltage/current under obtained two-phase rotating coordinate system is decoupled, finally gives the two-phase rotation after decoupling
Turn the voltage u under coordinate system1d、u1q；
4) voltage under the two-phase rotating coordinate system that will be obtained after decoupling is sent to the 3rd module, by under two-phase rotating coordinate system
Voltage conversion into the voltage under three-phase static coordinate system, this voltage signal is sent to SPWM modulation modules, conventional voltage is obtained
Switching signal needed for type inverter；
5) detect that the voltage of transmitter collection Z source impedance network electric capacity is sent to biography after being compared with reference value using capacitance voltage
System PI controllers, produce the straight-through vector needed for Z-source inverter after being adjusted through PI controllers；By the straight-through arrow of traditional switch vector
The total switching signal of inverter is obtained after amount superposition, the signal controls three-phase inverter in Z-source inverter after overdrive circuit
The on and off of switching tube, and then control the amplitude and phase of grid-connected inverter system networking electric current；
APF control methods：
(1) detect transmitters sense to single-phase voltage u using single-phase mains voltagea, by single-phase mains voltage phaselocked loop
Obtain the grid-connected angle ω of A phase voltages1t；
(2) three phase network current detecting transmitter, detection net side three-phase grid electric current i are utilizeda、ib、ic, by this three-phase electricity
Stream and single-phase grid-connected angle ω1T, is sent to the second module, and the electric current under three-phase static coordinate system can be converted into two-phase by this module
Electric current i under rotating coordinate systempf、iqf；
(3) electric current under the two-phase rotating coordinate system in step (2) is become into electric current respectively by low pass filter LPFBy electric currentAnd single-phase grid-connected angle ω1T, is sent to the 4th module, by the electricity under two-phase rotating coordinate system
Stream contravariant changes the electric current i under three-phase static coordinate system intoaf、ibf、icf；
(4) by the three-phase current i in step (3)af、ibf、icfWith three-phase grid electric current ia、ib、icMake the difference respectively and obtain three
Contained higher harmonic current i in phase currentah、ibh、ich；
(5) modulated signal of Active Power Filter-APF is obtained after the higher harmonic current in step (4) is negated, this is believed
Number being sent to SPWM modulation modules is modulated, and obtains the switching signal of inverter in APF, and APF is produced and electric current higher hamonic wave phase
Anti- harmonic current is compensated to system, so as to reach the effect for filtering out harmonic wave.
The beneficial effects of the present invention are：Z-source inverter grid-connected control method of the invention based on Active Power Filter-APF,
Compared with conventional voltage type inverter, Z-source inverter of the present invention has stepping functions, it is not necessary to added in prime
DC-DC transfer circuit, reduces the volume and cost of system；The lower power tube of same bridge arm is allowed to simultaneously turn on, can
Effectively to prevent from burning component, on the one hand improve the security of circuit, the harmonic wave on the other hand reducing grid-connected current is abnormal
Variability；The present invention is filtered using Active Power Filter-APF APF to grid-connected current, using Instantaneous Power Theory to harmonic current
Detected, extract and separate the idle harmonious wave component in electric current, and harmonic current is compensated and tracing control, energy
Enough it is effectively improved grid-connected current quality, administers harmonic pollution；The addition of Voltage loop can effectively maintain the stability of system voltage,
The addition of electric current loop can realize that unity power factor is grid-connected；The present invention is effective by Active Power Filter-APF APF and Z-source inverter
With reference to having the advantages that output voltage range is big, filter effect is good, control accuracy is high, dynamic and static state performance is good, highly reliable.And
And can be by this control method, filtering method is generalized in other single-phase and three-phase grid-connected inverting systems.
Brief description of the drawings
Fig. 1 is the Z-source inverter cutting-in control structure chart of the invention based on Active Power Filter-APF；
Fig. 2 is dq decoupler shafts control figure of the present invention；
Fig. 3 is shunt active power filter system construction drawing of the present invention；
Fig. 4 is current detecting schematic diagram of the present invention；
Fig. 5 is Z sources capacitance voltage figure of the present invention；
Fig. 6 is A phases grid-connected current figure of the present invention；
Fig. 7 is grid-connected harmonic current figure of the invention；
Fig. 8 is the A phase current figures before and after APF of the present invention is filtered；
Fig. 9 is grid-connected current spectrum analysis figure of the present invention；
Line voltage and grid-connected current figure when Figure 10 is present invention instruction change.
Embodiment
The Z-source inverter cutting-in control structure chart of Active Power Filter-APF (APF), direct voltage source are based on as shown in Figure 1
VdcIt is connected in parallel on Z-source inverter, line is passed through in Z source impedance networks and three-phase inverter composition Z-source inverter, Z-source inverter output
Road inductance LiGet access to grid and load, line inductance LiActive Power Filter-APF APF between power network, loads RLWith the pole of electric power two
Pipe constitutes harmonic wave occurring source together.Cutting-in control part includes Z sources capacitance voltage detection transmitter, current on line side detection pick-up
Device, net side detecting voltage by three phase transmitter, three-phase power grid voltage phaselocked loop, single-phase mains voltage phaselocked loop, low pass filter, will
Voltage on line side is transformed into the module 1 of two-phase rotating coordinate system by three-phase static coordinate system, by current on line side by three phase static coordinate
System is transformed into the module 2 of two-phase rotation, and voltage is changed to the module 3 of three-phase static coordinate system by two-phase rotating coordinate system contravariant,
Electric current is changed to the module 4 of three-phase static coordinate system by two-phase rotating coordinate system contravariant, three PI controllers are used for Z-source inverter
Control section, two SPWM modules for producing modulated drive signal.
Specifically rate-determining steps are：
First, Z-source inverter part：
(1) voltage detecting transmitter collection three-phase grid voltage u is utilizeda、ub、uc, on the one hand this three-phase voltage is sent to three
Phase voltage phaselocked loop gathers the grid-connected angle ω t of three-phase grid voltage, is on the other hand sent to three-phase voltage and grid-connected angle ω t
Module 1, this module 1 can be by the voltage conversion under three-phase static coordinate system into the voltage u under two-phase rotating coordinate systemd、uq。
(2) three-phase current detection transmitters sense three-phase grid electric current i is utilizeda、ib、ic, by this three-phase current and grid-connected angle
Degree ω t are sent to module 2, and the electric current under three-phase static coordinate system is converted into the electric current i under two-phase rotating coordinate system by module 2d、iq。
(3) voltage/current under obtained two-phase rotating coordinate system is decoupled, dq decoupler shafts block diagram as shown in Fig. 2
The step of decoupling is：(a) by the electric current i under two-phase rotating coordinate systemd、iqRespectively with referring to orthogonal shaft currentCompare.
(b) result in previous step is sent to PI controllers respectively.(c) ω L are multiplied by the output of module 2 respectivelyi(LiFor line electricity
Sense), its result is compared respectively with the output of PI controllers and the output of module 1.(d) two after decoupling are finally given
Voltage u under cordic phase rotator system1d、u1q。
(4) voltage under the two-phase rotating coordinate system that will be obtained after decoupling is sent to module 3, and module 3, which can rotate two-phase, sits
This voltage signal is sent to SPWM modulation modules, passed by the voltage conversion under mark system into the voltage under three-phase static coordinate system
Switching signal needed for system voltage source inverter.
(5) detect that the voltage of transmitter collection Z source impedance network electric capacity is sent to after being compared with reference value using capacitance voltage
Conventional PI control device, produces the special straight-through vector needed for Z-source inverter after being adjusted through PI controllers.By traditional switch vector
With it is straight-through it is vector superposed after obtain the total switching signal of inverter, the signal is controlled three in Z-source inverter after overdrive circuit
The on and off of phase inverter switching tube, and then control the amplitude and phase of grid-connected inverter system networking electric current.
2nd, APF control sections：
Fig. 3 gives the structure chart of parallel connection type active electric filter, and the Detection and Extraction process of wherein harmonic current is for example attached
Shown in Fig. 4.Concretely comprise the following steps：
(1) single-phase mains voltage phaselocked loop is utilized, the grid-connected angle ω of A phase voltages is detected1t。
(2) three phase network current detecting transmitter, detection net side three-phase grid electric current i are utilizeda、ib、ic, by this three-phase electricity
Stream and single-phase grid-connected angle ω1T, is sent to module 2, and the electric current under three-phase static coordinate system can be converted into two-phase rotation by this module
Electric current i under coordinate systempf、iqf。
(3) electric current under the two-phase rotating coordinate system in step (2) is become into electric current respectively by low pass filter LPFBy electric currentAnd single-phase grid-connected angle ω1T, is sent to module 4, and module 4 can be by under two-phase rotating coordinate system
Electric current contravariant change electric current i under three-phase static coordinate system intoaf、ibf、icf。
(4) by the three-phase current i in step (3)af、ibf、icfWith three-phase grid electric current ia、ib、icMake the difference respectively and obtain three
Contained higher harmonic current i in phase currentah、ibh、ich。
(5) modulated signal of Active Power Filter-APF is obtained after the higher harmonic current in step (4) is negated, this is believed
Number being sent to SPWM modulation modules is modulated, and obtains the switching signal of inverter in APF, APF will produce humorous with electric current high order
The opposite harmonic current of ripple is compensated to system, so as to reach the effect for filtering out harmonic wave.
In order to verify the correctness of above-mentioned theory analysis, simulation study has been carried out to this control method.
Main circuit parameter is as shown in table 1：
Table 1
Index of modulation m=0.75, D=0.27 capacitance voltage reference value u of Z-source invertercref=800V, outer voltage Kp
=1.32, Ki=3200.Active command electric current is 30A, and reactive command electric current is 0, current inner loop Kp=0.254, Ki=15.8,
The initial voltage u of Active Power Filter-APF DC capacitordc=700V.
Fig. 5 is the waveform of Z-source inverter capacitance voltage, and capacitance voltage early stage vibrates, and is the electricity because Z source networks
Appearance, inductance have the process of discharge and recharge, and discharge and recharge terminates rear capacitance voltage stabilization in 800V or so and meets UC=(1-D)/
(1-2D)VdcRelation.Account for voltage ring can be worked well with, that is, can guarantee that the stabilization of grid-connected voltage, and this is the stable fortune of system
Capable premise.
Fig. 6 is the A phase grid-connected currents detected, including the actually detected electric current arrived and passes through coordinate transform and inverse transformation
The fundamental current obtained afterwards.Red curve is the actually detected grid-connected current arrived, and shape is in saddle, contains a large amount of harmonic waves.
Measured current and fundamental current in Fig. 6 is made the difference, the harmonic components in grid-connected current are obtained as shown in fig. 7, will
Harmonic component in Fig. 7 takes opposite number as the reference signal of inverter in APF, makes inverter produce corresponding electric current to eliminate
Harmonic signal in network.
APF is put among power network in 0.04s, and Contrary compensation is carried out to harmonic current, filter effect is reached, before and after compensation
A phase grid-connected currents it is as shown in Figure 8.
It can be seen from current spectrum analysis chart 9 it is compensated after grid-connected current percent harmonic distortion than relatively low, THD=
1.28%, national standard (GB/T14549-1993) is met, grid-connected total harmonic distortion factor answers≤5% standard.
Because reactive command electric current is 0 during emulation, it can also be seen that line voltage and grid-connected current keep same from Figure 10
Phase, it is grid-connected that system realizes unity power factor.Simultaneously for the dynamic characteristic and tracking velocity of verificating current ring, in t=
Active command electric current arrives 50A by 30A mutation during 0.05s, can be seen that grid-connected current can quick trace command value from the middle period is schemed
Change, and output waveform is good.
Claims (1)
1. a kind of Z-source inverter grid-connected control method based on Active Power Filter-APF, direct voltage source VdcIt is connected in parallel on the inversion of Z sources
On device, Z-source inverter output is by line inductance LiGet access to grid and load, line inductance LiThere is parallel connection type active between power network
Electric-power filter APF, it is characterised in that cutting-in control part includes Z sources capacitance voltage detection transmitter, current on line side detection and become
Device, net side detecting voltage by three phase transmitter, three-phase power grid voltage phaselocked loop, single-phase mains voltage phaselocked loop, low pass filter are sent,
Voltage on line side is transformed into the first module of two-phase rotating coordinate system by three-phase static coordinate system, by current on line side by three phase static
Coordinate system is transformed into the second module of two-phase rotation, and voltage is changed into three-phase static coordinate system by two-phase rotating coordinate system contravariant
3rd module, electric current is changed to by two-phase rotating coordinate system contravariant the 4th module of three-phase static coordinate system, PI controllers and two
The individual SPWM modules for being used to produce modulated drive signal；
Z-source inverter control method：
1) voltage detecting transmitter collection three-phase grid voltage ua、ub、uc, on the one hand this three-phase voltage is sent to three-phase voltage lock
Phase ring gathers the grid-connected angle ω t of three-phase grid voltage, and three-phase voltage and grid-connected angle ω t on the other hand are sent into the first mould
Block, by the voltage conversion under three-phase static coordinate system into the voltage u under two-phase rotating coordinate systemd、uq；
2) three-phase current detection transmitters sense three-phase grid electric current i is utilizeda、ib、ic, by this three-phase current and grid-connected angle ω t
The second module is sent to, the electric current under three-phase static coordinate system is converted into the electric current i under two-phase rotating coordinate systemd、iq；
3) voltage/current under obtained two-phase rotating coordinate system is decoupled, finally gives the two-phase rotation after decoupling and sit
Voltage u under mark system1d、u1q；
4) voltage under the two-phase rotating coordinate system that will be obtained after decoupling is sent to the 3rd module, by the electricity under two-phase rotating coordinate system
Pressure is converted into the voltage under three-phase static coordinate system, and this voltage signal is sent into SPWM modulation modules, conventional voltage type is obtained inverse
The switching signal become needed for device；
5) detect that the voltage of transmitter collection Z source impedance network electric capacity is sent to traditional PI after being compared with reference value using capacitance voltage
Controller, produces the straight-through vector needed for Z-source inverter after being adjusted through PI controllers；Traditional switch vector is led directly into vector to fold
Plus after obtain the total switching signal of inverter, the signal controls three-phase inverter in Z-source inverter to switch after overdrive circuit
The on and off of pipe, and then control the amplitude and phase of grid-connected inverter system networking electric current；
APF control methods：
(1) detect transmitters sense to single-phase voltage u using single-phase mains voltagea, A is obtained by single-phase mains voltage phaselocked loop
The grid-connected angle ω of phase voltage1t；
(2) three phase network current detecting transmitter, detection net side three-phase grid electric current i are utilizeda、ib、ic, by this three-phase current and
Single-phase grid-connected angle ω1T, is sent to the second module, and the electric current under three-phase static coordinate system can be converted into two-phase rotation by this module
Electric current i under coordinate systempf、iqf；
(3) electric current under the two-phase rotating coordinate system in step (2) is become into electric current respectively by low pass filter LPFBy electric currentAnd single-phase grid-connected angle ω1T, is sent to the 4th module, by the electricity under two-phase rotating coordinate system
Stream contravariant changes the electric current i under three-phase static coordinate system intoaf、ibf、icf；
(4) by the three-phase current i in step (3)af、ibf、icfWith three-phase grid electric current ia、ib、icMake the difference respectively and obtain three-phase electricity
Contained higher harmonic current i in streamah、ibh、ich；
(5) modulated signal of Active Power Filter-APF is obtained after the higher harmonic current in step (4) is negated, this signal is sent
It is modulated to SPWM modulation modules, obtains the switching signal of inverter in APF, APF produces opposite with electric current higher hamonic wave
Harmonic current is compensated to system, so as to reach the effect for filtering out harmonic wave.
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| CN201710427396.1A CN107221931A (en) | 2017-06-08 | 2017-06-08 | Z-source inverter grid-connected control method based on Active Power Filter-APF |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448630A (en) * | 2018-04-24 | 2018-08-24 | 上海电力学院 | The Z-source inverter grid-connected control method controlled based on monocycle and double-current ring |
| CN110336279A (en) * | 2019-07-17 | 2019-10-15 | 国网湖南省电力有限公司 | Power system oscillation Adaptive Suppression method, system and medium based on grid-connection converter |
| CN117239813A (en) * | 2023-11-15 | 2023-12-15 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066607A (en) * | 2012-12-15 | 2013-04-24 | 安徽工程大学 | STATCOM current tracking and compensation method |
| CN106786738A (en) * | 2016-12-23 | 2017-05-31 | 上海电力学院 | Z-source inverter grid-connected control method based on SVPWM and PI type Fuzzy |
-
2017
- 2017-06-08 CN CN201710427396.1A patent/CN107221931A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066607A (en) * | 2012-12-15 | 2013-04-24 | 安徽工程大学 | STATCOM current tracking and compensation method |
| CN106786738A (en) * | 2016-12-23 | 2017-05-31 | 上海电力学院 | Z-source inverter grid-connected control method based on SVPWM and PI type Fuzzy |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448630A (en) * | 2018-04-24 | 2018-08-24 | 上海电力学院 | The Z-source inverter grid-connected control method controlled based on monocycle and double-current ring |
| CN110336279A (en) * | 2019-07-17 | 2019-10-15 | 国网湖南省电力有限公司 | Power system oscillation Adaptive Suppression method, system and medium based on grid-connection converter |
| CN117239813A (en) * | 2023-11-15 | 2023-12-15 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
| CN117239813B (en) * | 2023-11-15 | 2024-01-26 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
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Application publication date: 20170929 |