CN103607129B - The control method of frequency converter - Google Patents
The control method of frequency converter Download PDFInfo
- Publication number
- CN103607129B CN103607129B CN201310581256.1A CN201310581256A CN103607129B CN 103607129 B CN103607129 B CN 103607129B CN 201310581256 A CN201310581256 A CN 201310581256A CN 103607129 B CN103607129 B CN 103607129B
- Authority
- CN
- China
- Prior art keywords
- state
- delta
- shaped region
- voltage vectors
- basic voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention relates to the control method of a kind of frequency converter, it is characterised in that including: transformed under 60 degree of coordinate systems by rectangular coordinate system by reference voltage vector；According to the coordinate of three basic voltage vectors, calculate on off state and the on off state value of each basic voltage vectors；Number according on off state and on off state value, reject the on off state that in the on off state corresponding to each delta-shaped region, common-mode voltage is higher；Determine reference voltage vector delta-shaped region at place under 60 degree of coordinate systems；Seven segmentation SVPWM modulated signals are formed according to the remaining on off state corresponding to a delta-shaped region；Seven segmentation SVPWM modulated signals are mapped to the driving signal of the switching tube for driving frequency converter, to control frequency converter.Owing to The present invention reduces the redundant state of switch, reduce the complexity of algorithm, improve the operational efficiency of algorithm, reduce common-mode voltage and the switching frequency of output voltage.
Description
Technical field
The present invention relates to frequency converter field, the control method of a kind of frequency converter.
Background technology
Along with the development of Power Electronic Technique, multi-level frequency conversion device technology is subject to more in high-power application
Carry out the most concerns.Multi-level frequency conversion device can be under conditions of not increasing devices switch frequency, by increasing output-voltage levels
Number so that output waveform has more preferable harmonic spectrum, and the voltage stress that each switching device is born is less, and switching loss is more
Little, can avoid by big the caused various problems of dv/dt, increase the capacity of system and pressure.
SVPWM (Space Vector Pulse Width Modulation, SVPWM) strategy is frequency conversion
One of modulation algorithm of device system.SVPWM algorithm is applied on multi-level frequency conversion device, but this algorithm has substantial amounts of superfluous
Remaining on off state so that control algolithm is extremely complex, and switching frequency is higher, switching device loss ratio is relatively big, output
Common-mode voltage is higher.
Summary of the invention
It is an object of the invention to provide that a kind of algorithm is simple, speed is fast, switching frequency is relatively low, output common mode voltage is low,
Be suitable to the control method of the frequency converter of many level progression.
For solving above-mentioned technical problem, as one aspect of the present invention, it is provided that the control method of a kind of frequency converter, bag
Including: transformed under 60 degree of coordinate systems by reference voltage vector by rectangular coordinate system, described 60 degree of coordinate systems include multiple triangle
Shape region；The seat of three basic voltage vectors corresponding to each described delta-shaped region is determined according to described 60 degree of coordinate systems
Mark；According to the coordinate of described three basic voltage vectors, calculate on off state and the switch shape of each described basic voltage vectors
State value；Group number according to described on off state and on off state value, reject the switch shape corresponding to each described delta-shaped region
The on off state that in state, common-mode voltage is higher；Determine described reference voltage vector under described 60 degree of coordinate systems one of place
Delta-shaped region；Seven segmentation SVPWM modulation letters are formed according to the remaining on off state corresponding to one delta-shaped region
Number；Described seven segmentation SVPWM modulated signals are mapped to the driving signal of the switching tube for driving described frequency converter, with control
Make described frequency converter.
Further, the switch shape that in the on off state corresponding to one delta-shaped region, common-mode voltage is higher is rejected
State includes: if the group number of described on off state is even number, the most only retains on off state value in these on off states minimum
Two on off states；If the group number of described on off state is odd number, the most only retain the on off state value in these on off states
A minimum on off state.
Further, seven segmentation SVPWM are formed according to the remaining on off state corresponding to one delta-shaped region
Modulated signal includes: if the three of one delta-shaped region on off state group numbers corresponding to basic voltage vectors are strange
Number, then by opening corresponding to minimum for the on off state changing value relatively going up the final stage in a cycle basic voltage vectors
Off status is as the on off state of the first paragraph of next cycle；Calculate other two basic voltage vectors breaker in middle state group number
It it is the on off state change of the on off state of the most described first paragraph of the on off state corresponding to that basic voltage vectors of
Value；If this on off state changing value is 1, by the switch shape corresponding to that basic voltage vectors that on off state group number is one
State is the on off state of second segment, and using another the corresponding on off state in the two basic voltage vectors as the 3rd
The on off state of section；Otherwise, it is the 3rd by the on off state corresponding to that basic voltage vectors that on off state group number is one
The on off state of section, and by the A phase on off state in another the corresponding on off state in the two basic voltage vectors
It is worth minimum that on off state as second segment；Using the on off state of described first paragraph as the on off state of the 4th section.
Further, seven segmentation SVPWM are formed according to the remaining on off state corresponding to one delta-shaped region
Modulated signal includes: if the three of one delta-shaped region on off state sums corresponding to basic voltage vectors are for even
Number, then by opening corresponding to minimum for the on off state changing value relatively going up the final stage in a cycle basic voltage vectors
Off status is as the on off state of the first paragraph of next cycle；Its excess-three in one delta-shaped region is switched shape
State is respectively as second segment, the 3rd section and the on off state of the 4th section.
Further, the on off state of the 5th section in described seven segmentation SVPWM modulated signals and described 3rd section open
Off status is consistent.
Further, the opening of the on off state of the 6th section in described seven segmentation SVPWM modulated signals and described second segment
Off status is consistent.
Further, the opening of the on off state of the 7th section in described seven segmentation SVPWM modulated signals and described first paragraph
Off status is consistent.
Owing to the present invention eliminates the on off state that part common-mode voltage is higher, decrease the redundant state of switch, thus,
Reduce the complexity of algorithm, improve the operational efficiency of algorithm, reduce common-mode voltage and the switching frequency of output voltage,
The switching loss making device reduces, and extends to any level, and the complexity of its algorithm is constant.
Accompanying drawing explanation
Fig. 1 diagrammatically illustrates the control algolithm flow chart of the present invention；
Fig. 2 diagrammatically illustrates the space voltage vector figure of five level progression frequency converters in an embodiment；
Fig. 3 diagrammatically illustrates the space voltage vector figure removing high common-mode voltage in Fig. 2；
Fig. 4 diagrammatically illustrates reference voltage at the first little sector chart in big sector the 7th；
Fig. 5 diagrammatically illustrates reference voltage at the first little sector chart in big sector the 6th；
Fig. 6 diagrammatically illustrates the system diagram of the 3H bridge five-level converter in an embodiment.
Detailed description of the invention
Hereinafter embodiments of the invention are described in detail, but what the present invention can be defined by the claims and cover
Multitude of different ways is implemented.
The invention provides the control method of a kind of frequency converter, refer to Fig. 1, including: by reference voltage vector by right angle
Under coordinate system transformation to 60 degree coordinate system, described 60 degree of coordinate systems include multiple delta-shaped region；According to described 60 degree of coordinate systems
Determine the coordinate of three basic voltage vectors corresponding to each described delta-shaped region；According to described three basic voltage vectors
Coordinate, calculate on off state and the on off state value of each described basic voltage vectors；Group number according to described on off state
With on off state value, reject the on off state that in the on off state corresponding to each described delta-shaped region, common-mode voltage is higher；
Determine described reference voltage vector delta-shaped region at place under described 60 degree of coordinate systems；According to one triangle
Remaining on off state corresponding to region forms seven segmentation SVPWM modulated signals；By described seven segmentation SVPWM modulated signals
It is mapped to the driving signal of switching tube for driving described frequency converter, to control described frequency converter.
Refer to Fig. 1, it is first determined reference voltage vector, then reference voltage Vref (V α, V β) carried out coordinate transform,
Transform to 60 degree of coordinate systems from rectangular coordinate system.Refer to Fig. 2, under 60 degree of coordinate systems, there is multiple delta-shaped region,
Each delta-shaped region has three summits, and each apex is with least one set numeral, and it represents the switch shape of three-phase respectively
State (Sa, Sb, Sc), Sa represents the on off state of A phase, and Sb represents the on off state of B phase, and Sc represents the on off state of C phase.Number
The group number of word is defined as the group numerical example of on off state such as, and as a example by the set of number-2 2-1 in Fig. 2 upper left corner, it represents three-phase
On off state :-2,2 and-1, i.e. Sa=-2, Sb=2, Sc=-1.
So, according to the on off state function (Sa, Sb, Sc) of this certain delta-shaped region, it is possible to use following formula calculates should
On off state value corresponding to summit, wherein, X is on off state value, and Si is one group of switch on a summit
Three on off states in function of state.
Further, also by following formula calculate a summit of this certain delta-shaped region change to another summit time
On off state changing value.Wherein, Y represents on off state changing value, SiRepresent corresponding to current vertex
The on off state value of on off state function, Si ’Represent the on off state value of on off state function corresponding to a summit.
Then, according to group number and the on off state value of described on off state, reject corresponding to each described delta-shaped region
On off state in the higher on off state of common-mode voltage, as shown in Fig. 3.
Refer to Fig. 4 and Fig. 5, after reference voltage transforms under 60 degree of coordinate systems, be positioned at a certain delta-shaped region.Connect
, just can form seven segmentation SVPWM modulated signals according to the remaining on off state corresponding to one delta-shaped region；
Described seven segmentation SVPWM modulated signals are mapped to the driving signal of the switching tube for driving described frequency converter,
To control described frequency converter.
Owing to the present invention eliminates the on off state that part common-mode voltage is higher, decrease the redundant state of switch, thus,
Reduce the complexity of algorithm, improve the operational efficiency of algorithm, reduce common-mode voltage and the switching frequency of output voltage,
The switching loss making device reduces, and extends to any level, and the complexity of its algorithm is constant.
Preferably, the on off state that in the on off state corresponding to one delta-shaped region, common-mode voltage is higher is rejected
Including: if the group number of described on off state is even number, the most only retain that on off state value in these on off states is minimum two
Individual on off state；If the group number of described on off state is odd number, the most only retain the on off state value in these on off states
A little on off state.So, for the summit of odd number group on off state, only retain an on off state value minimum
On off state, and for the summit of even number set on off state, only retain two groups of sky off status that on off state value is minimum, from
And eliminate the on off state that common-mode voltage is higher, reduce the redundant state of switch.
Preferably, form seven segmentation SVPWM according to the remaining on off state corresponding to one delta-shaped region to adjust
Signal processed includes: if the three of one delta-shaped region on off state sums corresponding to basic voltage vectors are strange
Number, then by opening corresponding to minimum for the on off state changing value relatively going up the final stage in a cycle basic voltage vectors
Off status is as the on off state of the first paragraph of next cycle；Calculate other two basic voltage vectors breaker in middle state group number
It it is the on off state change of the on off state of the most described first paragraph of the on off state corresponding to that basic voltage vectors of
Value；If this on off state changing value is 1, by the switch shape corresponding to that basic voltage vectors that on off state group number is one
State is the on off state of second segment, and using another the corresponding on off state in the two basic voltage vectors as the 3rd
The on off state of section；Otherwise, it is the 3rd by the on off state corresponding to that basic voltage vectors that on off state group number is one
The on off state of section, and the A phase in another the corresponding on off state in the two basic voltage vectors is switched shape
Minimum that of state value is as the on off state of second segment；Using the on off state of described first paragraph as the 4th section
On off state.The seven segmentation SVPWM modulated signals generated are utilized can directly to control at the on off state of each switching tube of frequency converter
In the state of being turned on or off, such as, at a time, utilize that seven segmentation SVPWM modulated signal Synchronization Control concurrently are all to be opened
Close the state of pipe.
Preferably, form seven segmentation SVPWM according to the remaining on off state corresponding to one delta-shaped region to adjust
Signal processed includes: if the three of one delta-shaped region on off state sums corresponding to basic voltage vectors are for even
Number, then by opening corresponding to minimum for the on off state changing value relatively going up the final stage in a cycle basic voltage vectors
Off status is as the on off state of the first paragraph of next cycle；Its excess-three in one delta-shaped region is switched shape
State is respectively as second segment, the 3rd section and the on off state of the 4th section.
Preferably, the on off state of the 5th section in the described seven segmentation SVPWM modulated signals switch with described 3rd section
State consistency.
Preferably, the on off state of the 6th section in described seven segmentation SVPWM modulated signals and the switch of described second segment
State consistency.
Preferably, the on off state of the 7th section in described seven segmentation SVPWM modulated signals and the switch of described first paragraph
State consistency.
As a example by a kind of 3H bridge five-level converter, (obviously, algorithm described below is applicable to other frequency conversion below
Device, it is not limited to 3H bridge five-level converter), the present invention is described in detail.Refer to Fig. 6, this frequency converter include every
From transformer, 12 pulse wave rectifier circuit, inverter, current sensor, voltage sensor, DA conversion chip, DSP+FPGA
Control circuit；The secondary side of wherein said isolating transformer and 12 pulse wave rectifier circuit connect, rectification output end and inverter
Being connected, DSP+FPGA control circuit is connected with inverter.Wherein, FPGA is connected with each switching tube of frequency converter, with
Control the break-make of this switching tube.Control algolithm in the present invention is realized by DSP, after it generates seven segmentation SVPWM modulated signals,
So, just the Synchronization Control to all switching tubes can be realized by FPGA.
Based on above-mentioned 3H bridge five-level converter, its control method to realize step as follows:
1) by reference voltage vector by being converted under rectangular coordinate system under 60 degree of coordinate systems.Such as, for the change of open loop type
Frequently, for control system, this reference voltage vector can be a predetermined output voltage vector value.Frequency conversion for closed loop
For system, this reference voltage vector can be the output voltage vector value of an actual measurement.
2) coordinate of three basic voltage vectors is determined according to the coordinate under new coordinate system (60 degree of coordinate systems).
3) action time of three basic voltage vectors is calculated.
4) definition on off state function (Sa, Sb, Sc), on off state value on off state changing value
5) according to the coordinate of three basic voltage vectors, the on off state of each vector and corresponding on off state are calculated
Value.Group number according on off state, if even number, the most only retains the on off state that two X values are minimum；If odd number, then
Retain the on off state that X value is minimum.The on off state of common-mode voltage high in Fig. 2 is rejected, retains common-mode voltage relatively low
On off state, thus obtain Fig. 3.
6) switching sequence is determined:
Definition on off state changing value:
If on off state sum is odd number in triangle, according to a upper cycle final stage on off state, select next
The first paragraph on off state in cycle makes Y value minimum.Then selecting on off state group number is the basic voltage vectors of, and counts
Calculate the Y value of corresponding on off state and first paragraph on off state, if Y is 1, be then second segment on off state, the 3rd section of switch
State is that in the on off state that residue basic voltage vectors is corresponding, A phase state value is minimum；If Y is not 1, then it it is the 3rd section
On off state, second segment on off state is that in the on off state that residue basic voltage vectors is corresponding, A phase state value is the highest.The
Four on off state same basic voltage vectors corresponding with first paragraph on off state, eventually form seven segmentation SVPWM modulation.
If on off state sum is even number in triangle, it is only necessary to according to a upper cycle final stage on off state, really
The starting on off state fixing a cycle makes Y minimum.
Such as, in an exemplary embodiment described in Fig. 4, when Vref is in triangle 7, triangle is total
On off state group number be 5.First paragraph on off state selects the on off state group number of basic voltage vectors to be 2, and A phase is opened
One that off status value is higher, meeting the on off state required is (2,0 ,-1) and (2,1 ,-1), last further according to a upper cycle
On off state, determine the Y value of the two on off state, hair-like state headed by Y value is minimum, it is assumed here that (2,0 ,-1) is full
The optimal requirement of foot.
The determination of second and third section of on off state.According to first paragraph on off state, first corresponding with basic voltage vectors opens
Off status group number is one compares, if calculating Y value is 1, then current switch states is second on off state, surplus
In remaining basic voltage vectors correspondence on off state, A phase is worth minimum for the 3rd section of on off state.Otherwise, current participation is compared
On off state is the 3rd section of on off state, and in residue on off state corresponding to basic voltage vectors, A phase is worth higher for second segment
On off state.Therefore, calculating the Y value of (2,0 ,-1) and (1,0 ,-1), Y value is 1, it is determined that (1,0 ,-1) is second segment switch
State, and (1,0 ,-2) be the 3rd section of on off state.
The determination of the 4th on off state.The remaining on off state of basic voltage vectors that first paragraph on off state is corresponding is i.e.
It is the 4th section of on off state.Here, (1 ,-1 ,-2) and (2,0 ,-1) corresponding same basic voltage vectors, so determine (1 ,-1 ,-
2) it is the 4th section of on off state.
The switching sequence finally determined is: (2,0 ,-1) → (1,0 ,-1) → (1,0 ,-2) → (1 ,-1,2) → (1,0 ,-
2) → (1,0 ,-1) → (2,0 ,-1).
In an exemplary embodiment described in Fig. 5, when Vref is in triangle 6, the switch shape that triangle is total
State group number is 4.Now, it is only necessary to determine first paragraph on off state, in order to judge the on off state in next cycle.First paragraph switchs
Same Fig. 4 of determination of state.
7) it is mapped to drive signal.
According on off state value, the IGBT being mapped as reality drives signal.
According to above-mentioned five-level converter SVPWM modulation algorithm, the on off state that part common-mode voltage is higher is rejected,
The little triangle having has only to less on off state and compares, have without comparing, i.e. can get output switch sequence so that calculate
The complexity of method reduces, and the arithmetic speed of algorithm improves, the common mode voltage reduction of output.
The invention has the beneficial effects as follows: rejecting the on off state that part common-mode voltage is higher, the redundant state of switch subtracts
Few, the complexity of algorithm reduces, and the operational efficiency of algorithm improves, the common mode voltage reduction of output voltage, and switching frequency reduces,
The switching loss of device reduces.Being generalized to any level, the complexity of algorithm is constant.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (5)
1. a control method for frequency converter, including: reference voltage vector is transformed to 60 degree of coordinate systems by rectangular coordinate system
Under, described 60 degree of coordinate systems include multiple delta-shaped region；Each described delta-shaped region is determined according to described 60 degree of coordinate systems
The coordinate of three corresponding basic voltage vectors；It is characterized in that:
According to the coordinate of described three basic voltage vectors, calculate on off state and the switch shape of each described basic voltage vectors
State value；
Group number according to described on off state and on off state value, reject the on off state corresponding to each described delta-shaped region
The on off state that middle common-mode voltage is higher；
Determine described reference voltage vector delta-shaped region at place under described 60 degree of coordinate systems；
Seven segmentation SVPWM modulated signals are formed according to the remaining on off state corresponding to one delta-shaped region；
Described seven segmentation SVPWM modulated signals are mapped to the driving signal of the switching tube for driving described frequency converter, with control
Make described frequency converter；
Reject the on off state that in the on off state corresponding to one delta-shaped region, voltage is higher to include:
If the group number of described on off state is even number, the most only retain that on off state value in these on off states is minimum two
On off state；
If the group number of described on off state is odd number, the most only retain that on off state value in these on off states is minimum one
On off state；
Remaining on off state corresponding to one delta-shaped region forms seven segmentation SVPWM modulated signals and includes:
If the three of one delta-shaped region on off state group numbers corresponding to basic voltage vectors are odd number, then by phase
An on off state basic voltage vectors corresponding to minimum to the on off state changing value of the final stage in a upper cycle is made
On off state for the first paragraph of next cycle；
Calculate the switch corresponding to that basic voltage vectors that other two basic voltage vectors breaker in middle state group number is
The on off state changing value of the on off state of the most described first paragraph of state；
If this on off state changing value is 1, by the switch corresponding to that basic voltage vectors that on off state group number is one
State is the on off state of second segment, and using another the corresponding on off state in the two basic voltage vectors as
The on off state of three sections；Otherwise, it is by the on off state corresponding to that basic voltage vectors that on off state group number is one
The on off state of three sections, and the A phase in another the corresponding on off state in the two basic voltage vectors is switched shape
Minimum that of state value is as the on off state of second segment；
Using the on off state of described first paragraph as the on off state of the 4th section.
2. according to the control method of the frequency converter described in claim 1, it is characterised in that: according to one delta-shaped region
Corresponding remaining on off state forms seven segmentation SVPWM modulated signals and includes:
If the three of one delta-shaped region on off state group numbers corresponding to basic voltage vectors are even number, then by phase
An on off state basic voltage vectors corresponding to minimum to the on off state changing value of the final stage in a upper cycle is made
On off state for the first paragraph of next cycle；
Using its excess-three group on off state the opening as second segment, the 3rd section and the 4th section in one delta-shaped region
Off status.
The control method of frequency converter the most according to claim 1 and 2, it is characterised in that: seven described segmentation SVPWM adjust
In signal processed, the on off state of the 5th section is consistent with the on off state of described 3rd section.
4. according to the control method described in claim 1 or 2, it is characterised in that in seven described segmentation SVPWM modulated signals
The on off state of the 6th section is consistent with the on off state of described second segment.
The control method of frequency converter the most according to claim 1 and 2, it is characterised in that: seven described segmentation SVPWM adjust
In signal processed, the on off state of the 7th section is consistent with the on off state of described first paragraph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581256.1A CN103607129B (en) | 2013-11-19 | 2013-11-19 | The control method of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581256.1A CN103607129B (en) | 2013-11-19 | 2013-11-19 | The control method of frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103607129A CN103607129A (en) | 2014-02-26 |
| CN103607129B true CN103607129B (en) | 2016-08-17 |
Family
ID=50125333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310581256.1A Expired - Fee Related CN103607129B (en) | 2013-11-19 | 2013-11-19 | The control method of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103607129B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158429B (en) * | 2014-08-27 | 2017-04-19 | 阳光电源股份有限公司 | Three-level photovoltaic inverter pulse width modulation method and modulator |
| US9559610B2 (en) * | 2014-10-01 | 2017-01-31 | Mitsubishi Electric Research Laboratories, Inc. | Method to generate multilevel inverter modulation control signals |
| CN104320013B (en) * | 2014-11-06 | 2017-01-18 | 东南大学 | Double-inverter common-mode voltage restraining method based on 60-degree coordinate system |
| CN107317498A (en) * | 2017-07-07 | 2017-11-03 | 华南理工大学 | A kind of many level based on dichotomy simplify SVPWM modulation strategies |
| CN110739875B (en) * | 2019-11-07 | 2020-11-27 | 北京交通大学 | Six-segment type nearest level approximation modulation method for eliminating MMC common-mode voltage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9362839B2 (en) * | 2011-02-09 | 2016-06-07 | Rockwell Automation Technologies, Inc. | Power converter with common mode voltage reduction |
-
2013
- 2013-11-19 CN CN201310581256.1A patent/CN103607129B/en not_active Expired - Fee Related
Non-Patent Citations (3)
| Title |
|---|
| 基于DSP与FPGA的５电平逆变器研究;戴鹏等;《电气传动》;20120930;第42卷(第9期);第29-32,55页 * |
| 多电平逆变器共模电压的抑制;赵莉等;《电力系统及其自动化学报》;20090630;第21卷(第3期);第63-68页 * |
| 新型5电平SVPWM 控制方法;朱玉琼等;《电器传动》;20130331;第43卷(第3期);第49-53页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103607129A (en) | 2014-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103607129B (en) | The control method of frequency converter | |
| JP5775033B2 (en) | Control device and control method for voltage type power converter | |
| CN103746585B (en) | Based on the multi-electrical level inverter neutral-point voltage balance method of hybrid modulation | |
| US9712070B2 (en) | Power conversion device | |
| CN107070278B (en) | A kind of discontinuous pulse duration modulation method of three-level current transformer neutral-point potential balance | |
| CN105337524B (en) | Three level active neutral-point-clamped photovoltaic DC-to-AC converter switching loss balance control methods | |
| CN103401455A (en) | Modulation method for active neutral-point clamp type tri-level inverter | |
| CN105610336A (en) | Dual-capacitor module based MMC type multi-port power electronic transformer | |
| US9130481B2 (en) | Power converting appartatus | |
| CN103746584B (en) | Based on the multi-electrical level inverter neutral-point voltage balance method of carrier offset | |
| CN101753044A (en) | Three-level midpoint potential balance control method based on zero-sequence voltage injection | |
| CN102307018B (en) | Inverter circuit and voltage space vector pulse width modulation method thereof | |
| CN101510736A (en) | Method for restraining mid-point potential excursion of three-phase four-bridge arm tri-level inverter | |
| JP6282486B2 (en) | Power converter | |
| CN109067299A (en) | Three port nonagon Modular multilevel converter topological structures and control method | |
| Arif et al. | Asymmetrical nine-level inverter topology with reduce power semicondutor devices | |
| JP2014090581A (en) | Power conversion device and power conversion method | |
| CN104300817B (en) | The control method of T-shaped three level SVPWM in energy conversion system | |
| CN106059352A (en) | Three-phase SVPWM algorithm for reducing switching loss of H/NPC converter | |
| Tarmizi et al. | Design and verification of improved cascaded multilevel inverter topology with asymmetric dc sources | |
| EP3171504A1 (en) | Discontinuous pwm for three-level npc converter | |
| CA3005583A1 (en) | Internal paralleled active neutral point clamped converter with logic-based flying capacitor voltage balancing | |
| JP2016063687A (en) | Power conversion system | |
| CN107863889B (en) | A kind of grid disturbance device | |
| Al-Atbee et al. | A cascade multi-level inverter topology with reduced switches and higher efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 221116 Research Institute of China University of Mining and Technology,, Jiangsu Applicant after: China University of Mining & Technology Address before: 221116 Xuzhou University Road,, Jiangsu, China University of Mining and Technology Applicant before: China University of Mining & Technology |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20171119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |