CN110445383A - A kind of two-stage type single-phase converter control method and control device - Google Patents
A kind of two-stage type single-phase converter control method and control device Download PDFInfo
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- CN110445383A CN110445383A CN201810409550.7A CN201810409550A CN110445383A CN 110445383 A CN110445383 A CN 110445383A CN 201810409550 A CN201810409550 A CN 201810409550A CN 110445383 A CN110445383 A CN 110445383A
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- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application discloses a kind of two-stage type single-phase converter control method and control device, which includes: two harmonics for including in any electrical operation parameter for be calculated two-stage type single-phase converter；Input after two harmonic is negated as adjuster；It is added to the output of the adjuster as compensation rate in the instruction of DC/DC convertor controls, obtains compensated DC/DC convertor controls instruction.The application can be realized the inhibition to two harmonics in DC/DC converter current.
Description
Technical field
The present invention relates to power electronics fields, more specifically to a kind of two-stage type single-phase converter controlling party
Method and control device.
Background technique
Two-stage type single-phase converter is cascaded by the DC/DC converter of prime and the single-phase converter of rear class, such as Fig. 1
It is shown.
In two-stage type single-phase converter, the instantaneous output power of single-phase converter includes two harmonics, can directly be led
Cause dc-link capacitance voltage, single-phase converter input current, DC/DC converter current (such as DC/DC converter output electricity
Stream, DC/DC converter input current, DC/DC converter internal current) it all include two harmonics, and DC/DC converter current
In two harmonics will lead to DC/DC converter loss increase, so as to cause efficiency reduction.
Summary of the invention
In view of this, the present invention provides a kind of two-stage type single-phase converter control method and control device, to realize to DC/
The inhibition of two harmonics in DC converter current.
A kind of two-stage type single-phase converter control method, comprising:
Two harmonics for including in any electrical operation parameter of two-stage type single-phase converter are calculated；
Input after two harmonic is negated as adjuster；
It is added in the instruction of DC/DC convertor controls, obtains compensated using the output of the adjuster as compensation rate
The instruction of DC/DC convertor controls.
Optionally, any one described electrical operation parameter is single-phase converter instantaneous output power, dc-link capacitance
Voltage, DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current.
Optionally, two harmonics for including in single-phase converter instantaneous output power are calculated, comprising:
Single-phase converter modulation voltage is exported into electric current multiplied by single-phase converter, obtains the instantaneous output work of single-phase converter
Then rate is filtered the two times of frequency divisions sought in single-phase converter instantaneous output power to single-phase converter instantaneous output power
Amount.
Optionally, when the DC/DC converter is non-isolation type DC/DC converter, it is defeated that DC/DC converter is calculated
Two harmonics for including in electric current, DC/DC converter input current or DC/DC converter internal current out, comprising:
Sampling obtains DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current,
Then it is filtered to obtain two harmonics for including in this electrical operation parameter；
When the DC/DC converter be isolated form DC/DC converter when, be calculated DC/DC converter output electric current,
Two harmonics for including in DC/DC converter input current or DC/DC converter internal current, comprising:
Sampling obtains DC/DC converter output electric current or DC/DC converter input current, is then filtered to it
Obtain two harmonics for including in this electrical operation parameter；Alternatively, sampling obtains DC/DC converter internal current, to sampling
Obtained DC/DC converter internal current is filtered again after taking absolute value, and obtains two harmonic wherein included.
A kind of two-stage type single-phase converter control device, comprising:
Computing unit, for two frequencys multiplication for including in any electrical operation parameter of two-stage type single-phase converter to be calculated
Component；
Unit is adjusted, for the input after negating two harmonic as adjuster；
Compensating unit, for using the output of the adjuster as compensation rate be added to DC/DC convertor controls instruction,
Obtain compensated DC/DC convertor controls instruction.
Optionally, any one described electrical operation parameter is single-phase converter instantaneous output power, dc-link capacitance
Voltage, DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current.
Optionally, the computing unit is obtained by the way that single-phase converter modulation voltage is exported electric current multiplied by single-phase converter
To single-phase converter instantaneous output power, then single-phase converter instantaneous output power is filtered and seeks single-phase converter wink
When output power in two harmonics.
Optionally, the computing unit calculates two frequencys multiplication in dc-link capacitance voltage using DFT RDFT algorithm
Component.
Optionally, when the DC/DC converter is non-isolation type DC/DC converter, the computing unit passes through sampling
DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current are obtained, then it is carried out
Filtering processing obtains two harmonics for including in this electrical operation parameter；
When the DC/DC converter is isolated form DC/DC converter, the computing unit obtains DC/DC by sampling
Converter exports electric current or DC/DC converter input current, is then filtered to obtain in this electrical operation parameter to it
Two harmonics for including obtain sampling alternatively, the computing unit obtains DC/DC converter internal current by sampling
DC/DC converter internal current take absolute value after be filtered again, obtain two harmonic wherein included.
It can be seen from the above technical scheme that the present invention on the basis of DC/DC convertor controls instruct by compensating
The instruction value that one two harmonic exports after negating through overregulating device modulation, reduces to reach according to DC/DC converter current
The direction of two harmonics is gone to change the purpose of the control amount of DC/DC convertor controls loop, to eliminate DC/DC converter electricity
Two harmonics for including in stream.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of two-stage type single-phase converter structural schematic diagram disclosed in the prior art；
Fig. 2 is a kind of two-stage type single-phase converter control method flow chart disclosed by the embodiments of the present invention；
Fig. 3 is the monophase system structural schematic diagram as made of the cascade of N number of two-stage type single-phase converter；
Fig. 4 is a kind of two-stage type single-phase converter controling device structure diagram disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to fig. 2, the embodiment of the invention discloses a kind of two-stage type single-phase converter control methods, comprising:
Step S21: two harmonics for including in any electrical operation parameter of two-stage type single-phase converter are calculated.
Specifically, any electrical operation parameter of the two-stage type single-phase converter, it is instantaneously defeated to can be single-phase converter
Power p out can be dc-link capacitance voltage udc, it is also possible to DC/DC converter current.The DC/DC converter current
It can be DC/DC converter output electric current io, can be DC/DC converter input current iin, it is also possible in DC/DC converter
Portion electric current il。
The two-stage type single-phase converter supports that energy in bidirectional flow, above-mentioned " input ", " output " are according to energy flow
Direction definition.For example, then single-phase converter is defeated close to the side of power grid when single-phase converter carries out inversion work
Side out, when single-phase converter carries out rectification work, then single-phase converter is input side close to the side of power grid.
DC/DC converter in the two-stage type single-phase converter can be isolated form DC/DC converter, be also possible to
Non-isolation type DC/DC converter, if it is isolated form DC/DC converter, then the DC/DC converter internal current ilSpecifically
Refer to DC/DC converter internal inductance electric current, if it is non-isolation type DC/DC converter, then the DC/DC converter internal current
ilSpecifically refer to DC/DC converter internal inductance electric current or DC/DC converter internal transformer electric current.Moreover, the two-stage type
Single-phase converter can be applied to the monophase system being made of a two-stage type single-phase converter of N (N >=1), also can be applied to by M
The three-phase system that (M >=3) a two-stage type single-phase converter is constituted.
For example, Fig. 3 shows the monophase system as made of the cascade of N number of two-stage type single-phase converter, this N number of two-stage type
DC/DC converter in single-phase converter is isolated form DC/DC converter, and isolated form DC/DC converter includes the DC/ of primary side
The AC/DC conversion module of AC conversion module and secondary side, this N number of isolated form DC/DC converter share a DC/AC conversion module.
Alternatively, this N number of isolated form DC/DC converter can also be divided into multiple groups, every group shares a DC/AC conversion module.
Wherein, the method that two harmonics for including in p are calculated, is described in detail below:
In the monophase system, it can be obtained by the way that single-phase converter modulation voltage is exported electric current multiplied by single-phase converter
To single-phase converter instantaneous output power p, two harmonics sought in p are then filtered to p.That is: single-phase unsteady flow is obtained
Device modulation voltage u=Usin (ω t) and single-phase converter output electric current i=Isin (ω t+ θ), are calculated single-phase change
Device instantaneous output power p is flowed, expression formula isSo
P is filtered afterwards, obtains two harmonics in pIn formula, ω indicates that angular frequency, U indicate single-phase
Current transformer modulation voltage peak value, I indicate that single-phase converter exports current peak, and t indicates the time, and θ indicates starting phase angle.
What needs to be explained here is that the present embodiment why uses single-phase converter modulation voltage rather than network voltage is gone
Two harmonics in p are sought, the initial phase and electric network voltage phase for being primarily due to single-phase converter modulation voltage exist
Difference, this difference is by the initial phase for two harmonics being directly reflected into p, and the difference of this initial phase can be led
The output of the adjuster in following step S22~step S23 is caused to generate deviation, so as to cause the present embodiment to two frequencys multiplication in p
The inhibitory effect of component is deteriorated, so the present embodiment is gone in the p sought using current transformer modulation voltage rather than network voltage
Two harmonics can be more accurate.
Wherein, u is calculateddcIn include two harmonics method, be described in detail below:
Pass through DFT (Discrete Fourier Transform, discrete Fourier transform) or RDFT (Recursive
Discrete Fourier Transform, recursive discrete Fourier transformation) algorithm calculating udcIn two harmonics.
What needs to be explained here is why the present embodiment uses DFT RDFT algorithm to calculate udcIn two times of frequency divisions
Amount, without obtaining u using high pass or bandpass filterdcIn two harmonics, be primarily due to using high pass or bandpass filtering
Device is readily incorporated phase error, and this fractional phase error will lead to and inhibit to two harmonics in DC/DC converter current
Effect is deteriorated.
Wherein, i is calculatedo、iinOr ilIn include two harmonics method, be described in detail below:
If it is non-isolation type DC/DC converter (such as buck converter), then sampling obtains i firsto、iinOr il, so
It is filtered afterwards to obtain two harmonics for including in this electrical operation parameter；
If it is isolated form DC/DC converter (such as high frequency LLC resonance DC/DC converter), then can sample first
To ioOr iin, then it is filtered to obtain two harmonics for including in this electrical operation parameter；Alternatively, can also be with
Sampling obtains i firstl, ilSampling is obtained wherein including two frequency multiplication envelopes for high-frequency current (such as switching frequency 100kHz)
IlIt takes absolute value, then ilIn include two frequency multiplication envelopes show as two harmonics, to the i after taking absolute valuelIt is filtered place
This two harmonic of part can be obtained in reason, can be considered ilIn include two harmonics.
What needs to be explained here is that DC/DC converter itself has the hardware capabilities of sample rate current, as control and electricity
Stream protection is used, it is possible to directly seek two harmonics using the existing current sensor sample rate current of DC/DC converter.
Step S22: the input after two harmonic is negated as adjuster.
Specifically, two harmonics for including in any electrical operation parameter of hypothesis two-stage type single-phase converter are e, then
It negates two harmonic to obtain-e.Single-phase converter instantaneous output power p in the monophase system, is calculated
In include two harmonicsFor, then it is negated to obtain
Step S23: it is added in the instruction of DC/DC convertor controls, obtains using the output of the adjuster as compensation rate
Compensated DC/DC convertor controls instruction.
Specifically, the front stage independent control of two-stage type single-phase converter, DC/DC converter has independent control ring
Road, such as double-closed-loop control loop.The basic thought of DC/DC convertor controls loop is to deviate desired value according to controlled variable
Opposite direction changes control amount, to eliminate the deviation between the actual value of controlled variable and desired value.The controlled variable packet
DC/DC converter current is included, the deviation between the actual value and desired value of DC/DC converter current is eliminated, exactly eliminates DC/DC
Two harmonics for including in the actual value of converter current.From above-mentioned basic thought, it is desirable to eliminate DC/DC converter electricity
Two harmonics for including in the actual value of stream go to change it is necessary to the direction for reducing two harmonics according to DC/DC converter current
Become control amount.And go to change control amount according to the direction that DC/DC converter current reduces two harmonics, it is exactly to become in DC/DC
It is superimposed on the basis of parallel operation control instruction after two harmonics negate through overregulating the value of device modulation output.
It is defeated to be overregulated device modulation after negating for one two harmonic of superposition on the basis of the instruction of DC/DC convertor controls
Value out, essence be exactly on the basis of former DC/DC convertor controls loop superposition one with the value be control target control
Loop.Due to being the two parallel relationship, so will not be impacted to former DC/DC convertor controls loop.In addition, being with the value
The bandwidth for controlling the control loop of target can be set to the bandwidth for being far below original DC/DC convertor controls loop, so will not
Influence the dynamic responding speed of DC/DC converter.Furthermore the present embodiment is without increasing any hardware, it is only necessary to increased portion sub-control
Algorithm processed, it is simple and easy, and there is adaptivity to the application scenarios for becoming fundamental frequency.
Wherein, the type of the adjuster is according to the type of any electrical operation parameter of the two-stage type single-phase converter
It is arranged, specifically: when any electrical operation parameter of the two-stage type single-phase converter is p or udcWhen, the adjuster can
Using P adjuster (i.e. proportional controller) or pi regulator (i.e. proportional and integral controller)；When the two-stage type single-phase converter
Any electrical operation parameter be io、iinOr ilWhen, PR adjuster (i.e. ratio resonant regulator), P can be used in the adjuster
Adjuster (i.e. proportional controller) or pi regulator (i.e. proportional and integral controller).
The output of the adjuster is arranged because of the topological structure of DC/DC converter, such as, when DC/DC converter is
When buck converter, the output form of the adjuster is duty ratio；When DC/DC converter is high frequency LLC resonance DC/DC transformation
When device, the output form of the adjuster is frequency.
By above to the description of the present embodiment it is found that the present embodiment passes through on the basis of DC/DC convertor controls instruct
The instruction value that one two harmonic of compensation export after negating through overregulating device modulation, to reach according to DC/DC converter current
The direction for reducing two harmonics is gone to change the purpose of the control amount of DC/DC convertor controls loop, to eliminate DC/DC transformation
Two harmonics for including in device electric current.
In addition, corresponding to the above method embodiment, the embodiment of the invention also discloses a kind of single-phase unsteady flows of two-stage type
Device control device, as shown in Figure 4, comprising:
Computing unit 100, for being calculated include in any electrical operation parameter of two-stage type single-phase converter two
Harmonic；
Unit 200 is adjusted, for the input after negating two harmonic as adjuster；
Compensating unit 300, for using the output of the adjuster as compensation rate be added to DC/DC convertor controls instruction
On, obtain compensated DC/DC convertor controls instruction.
Optionally, any one described electrical operation parameter is single-phase converter instantaneous output power, dc-link capacitance
Voltage, DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current.
Optionally, computing unit 100 is obtained by the way that single-phase converter modulation voltage is exported electric current multiplied by single-phase converter
Single-phase converter instantaneous output power, is then filtered that seek single-phase converter instantaneous to single-phase converter instantaneous output power
Two harmonics in output power.
Optionally, computing unit 100 calculates two times of frequency divisions in dc-link capacitance voltage using DFT RDFT algorithm
Amount.
Optionally, computing unit 100 obtains DC/DC converter by sampling and exports electric current, DC/DC converter input current
Or DC/DC converter internal current, then it is filtered to obtain two times of frequency divisions for including in this electrical operation parameter to it
Amount.
In conclusion the present invention is taken by compensating two harmonics on the basis of DC/DC convertor controls instruct
Through overregulating the instruction value of device modulation output after anti-, to reach the direction for reducing two harmonics according to DC/DC converter current
The purpose for going the control amount of change DC/DC convertor controls loop, to eliminate two frequencys multiplication for including in DC/DC converter current
Component.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest scope of features of novelty.
Claims (10)
1. a kind of two-stage type single-phase converter control method characterized by comprising
Two harmonics for including in any electrical operation parameter of two-stage type single-phase converter are calculated；
Input after two harmonic is negated as adjuster；
It is added to the output of the adjuster as compensation rate in the instruction of DC/DC convertor controls, obtains compensated DC/DC
Convertor controls instruction.
2. two-stage type single-phase converter control method according to claim 1, which is characterized in that described any one is electrical
Operating parameter are as follows: single-phase converter instantaneous output power, dc-link capacitance voltage, DC/DC converter export electric current, DC/DC
Converter input current or DC/DC converter internal current.
3. two-stage type single-phase converter control method according to claim 2, which is characterized in that single-phase unsteady flow is calculated
Two harmonics for including in device instantaneous output power, comprising:
Single-phase converter modulation voltage is exported into electric current multiplied by single-phase converter, obtains single-phase converter instantaneous output power, so
Two harmonics sought in single-phase converter instantaneous output power are filtered to single-phase converter instantaneous output power afterwards.
4. two-stage type single-phase converter control method according to claim 2, which is characterized in that DC bus is calculated
Two harmonics for including in capacitance voltage, comprising:
It is calculated in dc-link capacitance voltage using discrete Fourier transform DFT or recursive discrete Fourier transformation RDFT algorithm
Two harmonics.
5. two-stage type single-phase converter control method according to claim 2, which is characterized in that when the DC/DC is converted
Device be non-isolation type DC/DC converter when, be calculated DC/DC converter output electric current, DC/DC converter input current or
Two harmonics for including in DC/DC converter internal current, comprising:
Sampling obtains DC/DC converter output electric current, DC/DC converter input current or DC/DC converter internal current, then
It is filtered to obtain two harmonics for including in this electrical operation parameter to it；
When the DC/DC converter is isolated form DC/DC converter, DC/DC converter output electric current, DC/DC is calculated
Two harmonics for including in converter input current or DC/DC converter internal current, comprising:
Sampling obtains DC/DC converter output electric current or DC/DC converter input current, then is filtered to obtain to it
Two harmonics for including in this electrical operation parameter；Alternatively, sampling obtains DC/DC converter internal current, sampling is obtained
DC/DC converter internal current take absolute value after be filtered again, obtain two harmonic wherein included.
6. a kind of two-stage type single-phase converter control device characterized by comprising
Computing unit, for two times of frequency divisions for including in any electrical operation parameter of two-stage type single-phase converter to be calculated
Amount；
Unit is adjusted, for the input after negating two harmonic as adjuster；
Compensating unit, for using the output of the adjuster as compensation rate be added to DC/DC convertor controls instruction, obtain
Compensated DC/DC convertor controls instruction.
7. two-stage type single-phase converter control device according to claim 6, which is characterized in that described any one is electrical
Operating parameter is single-phase converter instantaneous output power, dc-link capacitance voltage, DC/DC converter exports electric current, DC/DC becomes
Parallel operation input current or DC/DC converter internal current.
8. two-stage type single-phase converter control device according to claim 7, which is characterized in that the computing unit passes through
Single-phase converter modulation voltage is exported into electric current multiplied by single-phase converter, obtains single-phase converter instantaneous output power, it is then right
Single-phase converter instantaneous output power is filtered two harmonics sought in single-phase converter instantaneous output power.
9. two-stage type single-phase converter control device according to claim 7, which is characterized in that the computing unit uses
DFT RDFT algorithm calculates two harmonics in dc-link capacitance voltage.
10. two-stage type single-phase converter control device according to claim 7, which is characterized in that when the DC/DC is converted
When device is non-isolation type DC/DC converter, the computing unit obtains DC/DC converter by sampling and exports electric current, DC/DC change
Then parallel operation input current or DC/DC converter internal current are filtered it to obtain to wrap in this electrical operation parameter
Two harmonics contained；
When the DC/DC converter is isolated form DC/DC converter, the computing unit obtains DC/DC transformation by sampling
Device exports electric current or DC/DC converter input current, then it is filtered to obtain in this electrical operation parameter include
Two harmonics, alternatively, the computing unit obtains DC/DC converter internal current by sampling, to the obtained DC/ of sampling
DC converter internal current is filtered again after taking absolute value, and obtains two harmonic wherein included.
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| CN201810409550.7A CN110445383A (en) | 2018-05-02 | 2018-05-02 | A kind of two-stage type single-phase converter control method and control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810409550.7A CN110445383A (en) | 2018-05-02 | 2018-05-02 | A kind of two-stage type single-phase converter control method and control device |
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| CN103872683A (en) * | 2012-12-18 | 2014-06-18 | 西门子公司 | Compensation device used for eliminating second harmonic pulsation in inverter and electrical power system |
| CN103931098A (en) * | 2012-01-18 | 2014-07-16 | 三菱电机株式会社 | Power conversion device |
| US20150333617A1 (en) * | 2009-07-31 | 2015-11-19 | Sunpower Corporation | Apparatus for converting direct current to alternating current |
| US20170338732A1 (en) * | 2016-05-18 | 2017-11-23 | Northeastern University | Power Conversion Devices and Control Methods Therefor |
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2018
- 2018-05-02 CN CN201810409550.7A patent/CN110445383A/en active Pending
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| CN101540510A (en) * | 2008-03-17 | 2009-09-23 | 北京能高自动化技术有限公司 | Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system |
| US20150333617A1 (en) * | 2009-07-31 | 2015-11-19 | Sunpower Corporation | Apparatus for converting direct current to alternating current |
| CN102148584A (en) * | 2010-02-10 | 2011-08-10 | 上海英孚特电子技术有限公司 | Compensation method of direct current (DC) voltage fluctuation of photovoltaic grid-connected inverter |
| CN103931098A (en) * | 2012-01-18 | 2014-07-16 | 三菱电机株式会社 | Power conversion device |
| CN103872683A (en) * | 2012-12-18 | 2014-06-18 | 西门子公司 | Compensation device used for eliminating second harmonic pulsation in inverter and electrical power system |
| US20170338732A1 (en) * | 2016-05-18 | 2017-11-23 | Northeastern University | Power Conversion Devices and Control Methods Therefor |
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Application publication date: 20191112 |