CN109713725A - The control method for parallel of wind-electricity integration three-level converter - Google Patents
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Abstract
The control method for parallel of wind-electricity integration three-level converter is related to wind-electricity integration converter field.The present invention is to solve the problems, such as that conventional parallel control mode is difficult to reduce circulation while improving and exporting current quality.The present invention possessed redundancy feature when synthesizing five level and exporting using three-level converter state, distributes to three-level converter in parallel for five-level switch magnetic sequence.Current ripples in one switch periods are distributed in continuous two switch periods, therefore for identical switch periods, reduce output current ripple, improves output current quality.The three level states combination of alternating action can also make circulation be unlikely to change facing one direction always, so that it is guaranteed that circulation average value is zero, reduce the high frequency circulating currents size during parallel running.In wind-electricity integration application, parallel current output quality can be improved and reduce the high frequency circulating currents size generated.
Description
Technical field
The invention belongs to wind-electricity integration converter field more particularly to the control methods of converter.
Background technique
During new energy power generation grid-connection, converters have the function of key.Recent years, with sea
The parallel running of the fast development of wind-powered electricity generation and distributed wind energy/solar energy industry, three-level converter becomes many industrial applications
The new trend of middle electric power system design.In the limited situation of switching device power grade, it can be obtained by converter parallel connection
Bigger power capacity and higher system reliability, at the same time, parallel connection converter also have modularization is high, redundancy by force with
And the advantages that easily facilitating heat dissipation and maintenance.
Traditional converter control method for parallel, which is broadly divided into, synchronizes in parallel and crisscross parallel two major classes.So-called synchronization is simultaneously
Connection is exactly two converters of parallel running using duplicate switching pulse.This parallel way may be implemented twice
The capacity of separate unit converter, but output current ripple performance and separate unit converter keep peer-level.And so-called crisscross parallel,
It is intentionally by the phase-shifting carrier wave 180 degree of two parallel connection converters, so that the output current ripple of two converters can be at certain
It cancels out each other in kind degree, so as to improve the current quality of parallel system overall output.Compared with synchronizing parallel connection, crisscross parallel is not
It only can be realized the capacity of twice separate unit converter, moreover it is possible to the quality of entire parallel system output electric current be substantially improved, therefore
It is widely studied and applied.But the disadvantage of crisscross parallel maximum is exactly, the carrier wave of phase phase difference 180 degree can generate
Biggish high frequency circulating currents cause system effectiveness decline, switching device stress to rise, or even be unable to operate normally system.Therefore,
Circulation problem is that crisscross parallel method enters one of key constraints of practical engineering application.
In grid-connected application, it is often desirable that the fewer the harmonic content that converter exchanges side output electric current the better, in this way can be with
Ensure that grid-connection converter is more friendly to power grid, reduces the harmonic pollution to power grid.But as described above, synchronous parallel method
It is helpless to improve output current quality；Crisscross parallel method can be improved the quality of output electric current, but circulation can be brought to ask
Topic.
Summary of the invention
The present invention is to solve conventional parallel control mode and be difficult to reduce circulation while improving and exporting current quality
The problem of, the control method for parallel of wind-electricity integration three-level converter is now provided, Lai Tigao grid-connected current quality simultaneously reduces high frequency
Circulation.
The control method for parallel of wind-electricity integration three-level converter, this method are as follows:
Two three-level converters in parallel are collectively regarded as five level systems, utilize traditional five level space vectors
Modulator approach generates five-level switch magnetic sequence corresponding with reference vector in a switch periods,
Five level states in five-level switch magnetic sequence are distributed to two three corresponding to three-level converter in parallel
In level switching sequence, distribution principle is as follows:
Five level states that numerical value in five-level switch magnetic sequence is even number are equally divided into two three level states, numerical value is
Five level states of even number include 0,2 and 4, and five level states that numerical value is 0 are divided into three level states that two values are 0, number
Five level states that value is 2 are divided into three level states that two values are 1, and five level states that numerical value is 4 are divided into two values
For 2 three level states；
Five level states that numerical value in five-level switch magnetic sequence is odd number are divided into two three level states, this two three electricity
Level state constitutes a state group, and state absolute value of the difference is minimum in the state group, all state differences in same switch periods
Average value be 0 and two neighboring switch periods in every phase circulation average value be 0, wherein state difference is two in state group
The difference of three level states；Numerical value is that five level states of odd number include 1 and 3, and five level states that numerical value is 1 are divided into numerical value and are
0 and numerical value be 1 three level states, five level states that numerical value is 3 are divided into three level states that numerical value is 1 and numerical value is 2.
Two three-level converters in parallel are modulated respectively using two tri-level switch sequences, so that in parallel
Two three-level converters generate the current quality for being equivalent to five-level converter, and the average differential mode and common mode loop of parallel system
Stream is zero.
In two neighboring switch periods, the numerical value allocation order of identical five level state of odd number under same action time
On the contrary.
Specifically,
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 1 are 0,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 1 are 1,0；
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 3 are 2,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 3 are 1,2,
Wherein, g=a, b, c.
The present invention is based on the bridge arm output state for analyzing three-level converter in parallel, derive three-level converter in parallel with
Single five level system has equivalence, can carry out global analysis to parallel system based on five level space vector modulator approaches
With control.Using three-level converter state when synthesizing five level and exporting possessed redundancy feature, propose a kind of alternating
Using three level Fault-tolerant Integrated modes, five-level switch magnetic sequence is distributed into three-level converter in parallel.This on off sequence
On the one hand the method for salary distribution, can be distributed to the current ripples in a switch periods in continuous two switch periods, therefore
For identical switch periods, output current ripple is reduced by, and output current quality is improved.On the other hand,
The three level states combination of alternating action can also make circulation be unlikely to change facing one direction always, so that it is guaranteed that circulation is average
Value is zero, substantially reduces the high frequency circulating currents size during parallel running.The method of the invention wind-electricity integration application in,
Parallel current output quality more higher than crisscross parallel method can be provided and effectively reduce the high frequency circulating currents size of generation.
Detailed description of the invention
Fig. 1 is wind-electricity integration three-level converter parallel running topology diagram；
Fig. 2 is the schematic vector diagram of five sectors level vector space I；
Fig. 3 is the on off sequence schematic diagram of five sectors level vector space I, 7 cell；
Fig. 4 is the differential mode circulation schematic diagram of five sectors level vector space I, 7 cell；
Fig. 5 is the common mode loop flow diagram of five sectors level vector space I, 7 cell；
Under the conditions of Fig. 6 is different modulating ratio, when using the method for the present invention and using traditional crisscross parallel method, electric current is exported
Mass experiment data comparison curve graph；
Under the conditions of Fig. 7 is different modulating ratio, when using the method for the present invention and using crisscross parallel method, common mode Loop experiment
Data comparison curve graph.
Specific embodiment
Wind-electricity integration three-level converter parallel running topological structure is as shown in Figure 1, comprising: DC bus, derided capacitors,
Two three-level converters, bridge arm filter inductance and output inductor, DC bus can use rectifier bridge device or direct
It is powered by DC sources such as solar panels；Derided capacitors are made of the capacitor Ca and capacitor Cb of two identical polars, capacitor Ca
Anode connect with the anode of DC bus, the cathode of capacitor Ca is connect with the positive of capacitor Cb, the company of capacitor Ca and capacitor Cb
Contact is the midpoint of derided capacitors, and the midpoint of derided capacitors is denoted as DC side neutral point N, the cathode and DC side power supply of capacitor Cb
Cathode connection；The anode of two all bridge arms of three-level converter is all connected to the anode of the DC bus, all bridge arms
Negative terminal be all connected to the negative terminal of DC bus, it is neutral that the clamp diode midpoint of all bridge arms is all connected to respective DC side
Point；Each converter include there are three three level bridge arms in parallel, the intermediate point of three three level bridge arms be successively denoted as A1 (A2),
B1(B2),C1(C2)；Bridge arm filter inductance includes two groups of three-phase filter inductances L1 and L2；The output inductor is one group three
Phase filter inductance L；For 3 points of A1, B1, C1 respectively together with A2, B2, C2 three point attachment, tie point is denoted as A respectivelypcc、Bpcc、
Cpcc；Apcc、Bpcc、Cpcc3 points of one end for being connected respectively to three-phase output inductor L；Three-phase output inductor L's is another
End is connected respectively in AC network.Canonical parameter in above-mentioned wind-electricity integration three-level converter parallel running topological structure is such as
Shown in following table:
System parameter table
| Parameter | Numerical value |
| Vdc | 200V |
| L1 | 6mH |
| L2 | 6mH |
| L | 1mH |
Two three-level converter xth phase output voltage Vx1NAnd Vx2NIt can indicate are as follows:
Wherein, Sx1And Sx2Respectively indicate the switch state of xth phase bridge arm in two three-level converters；VdcIndicate direct current
Busbar voltage.
Datum mark (Apcc、Bpcc、Cpcc) at exchange side export phase voltage VxpccNIt may be expressed as:
In view of Vx1NAnd Vx2NThe numerical value in formula (1) can only be taken, by (2) it is found that VxpccNOnly there are five types of different voltage values.
That is, if with Apcc、Bpcc、CpccOn the basis of point, then entire three level parallels system can export five kinds of different level.
Therefore, the system that two three-level converters form can be analyzed as five level systems on the whole.This
The output state of a every phase of five level systems and its relationship between two three-level converter states are as shown in the table:
The output state of the every phase of five level systems and its with two three-level converter state vs' tables
Since two three-level converters in parallel are equivalent to five level systems, then five electricity can be directly based upon
Flat means of space vector representation is modulated and controls to converter, without being regarded as two discrete three-level converters again.This
Sample can break constraint of the three level operation for converter switches device, provide more control freedom degrees on the whole,
To realize the promotion in performance.
Specific embodiment 1:
It is analyzed according to above, in the control method for parallel of the wind-electricity integration three-level converter described in present embodiment,
Two three-level converters in parallel are collectively regarded as five level systems, utilize traditional five level space vectors
Modulator approach generates five-level switch magnetic sequence corresponding with reference vector in a switch periods, specific five-level switch magnetic sequence
The generation method of column is as follows:
Typical five level vector space is made of 61 basic vectors, is expressed as V0To V60.To be located at five level
The zero common-mode voltage vector V at vector space center0Point is the center of circle, using the center of circle as origin, establishes α β plane rectangular co-ordinate
System take θ as the central angle of each sector, and every 60 ° are divided into a sector, and vector space is divided into 6 sectors, 6 sectors
It is allocated as follows table:
Sector allocation tables
| Sector | Center of circle angular region |
| Ⅰ | 60 ° of 0 °≤θ < |
| Ⅱ | 120 ° of 60 °≤θ < |
| Ⅲ | 180 ° of 120 °≤θ < |
| Ⅳ | 240 ° of 180 °≤θ < |
| Ⅴ | 300 ° of 240 °≤θ < |
| Ⅵ | 360 ° of 300 °≤θ < |
Wherein, each sector includes 16 cells.
Angle of the reference vector in vector space is matched with above-mentioned sector allocation tables, to determine reference vector institute
In sector, which is the vector to be modulated of five level systems；
Coordinate [V of the reference vector in vector space is determined using following formulaα,Vβ]:
Wherein, VrefIndicate the amplitude of reference vector, δ is the amplitude angle of reference vector；
If reference vector is located at the sector I, directly by [Vα,Vβ] following cell allocation table is substituted into judge reference vector institute
In cell；If reference vector is located at remaining sector, then since entire vector space has rotational symmetry, it is possible to by it
Reference vector in remaining sector (II-VI) rotates to the sector I and carries out analogy, and equally applying following cell allocation table can be sweared
Cell where amount；
Cell allocation table
After reference vector position has been determined, if three basic vectors of three apexes of cell where reference vector
Respectively Va、Vb、Vc, and corresponding vector action time is respectively Ta、Tb、Tc.According to voltage-second balance principle, opened at one
Close cycle TsIt is interior, available:
Vref·Ts=Va·Ta+Vb·Tb+Vc·Tc (4)
Real part is unfolded respectively with imaginary part, the T in each cell can be acquireda、Tb、Tc, shown in table specific as follows:
Vector action time table
Wherein, m indicates modulation ratio,
After obtaining above-mentioned vector action time, it will be able to according to cell, sector and on off sequence where reference vector
Allocation table obtains vector action time five-level switch magnetic sequence corresponding with reference vector in a switch periods, particular sequence
It is allocated as follows shown in table:
On off sequence allocation table
It obtains five-level switch magnetic sequence and then distributes five level states in five-level switch magnetic sequence to parallel connection
In two tri-level switch sequences corresponding to three-level converter, using two tri-level switch sequences respectively in parallel two
A three-level converter is modulated, so that two three-level converters in parallel generate the electric current for being equivalent to five-level converter
Quality, and the average differential mode of parallel system and common mode circulation are zero.
Circulation is one of the main problem of converter parallel running, when the converter output voltage of parallel running is inconsistent
When, voltage difference will generate circulation on circulation flow path.The presence of circulation can not only reduce system effectiveness, increase internal exergy dissipation
It consumes, even can damage switching device under serious conditions, so if circulation average value cannot be controlled be zero, then parallel inverter
Device system will be unable to operate normally.Although five level systems that three-level converter in parallel can be used as an entirety are divided
Analysis, but final switching pulse is still to be sent to two three-level converters in parallel, therefore how five level of generation
It is most important that on off sequence is converted to tri-level switch sequence.
In present embodiment, five-level switch magnetic sequence is assigned to two three level translations of parallel connection in such a way that redundancy is alternate
It is specific as follows in two tri-level switch sequences corresponding to device:
Five level states that numerical value in five-level switch magnetic sequence is even number are equally divided into two three level states,
Above-mentioned numerical value is that five level states of even number include 0,2 and 4,
Five level states that numerical value is 0 are divided into three level states that two values are 0,
Five level states that numerical value is 2 are divided into three level states that two values are 1,
Five level states that numerical value is 4 are divided into three level states that two values are 2.
Five level states that numerical value in five-level switch magnetic sequence is odd number are divided into two three level states, this two three electricity
Level state constitutes a state group, and state absolute value of the difference is minimum in the state group, all state differences in same switch periods
Average value be 0 and two neighboring switch periods in every phase circulation average value be 0, wherein state difference is two in state group
The difference of three level states, specific as follows:
Above-mentioned numerical value is that five level states of odd number include 1 and 3,
Five level states that numerical value is 1 are divided into three level states that numerical value is 0 and numerical value is 1,
Five level states that numerical value is 3 are divided into three level states that numerical value is 1 and numerical value is 2,
Further, in two neighboring switch periods, the numerical value of identical five level state of odd number under same action time
Allocation order on the contrary, specifically:
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 1 are 0,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 1 are 1,0；
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 3 are 2,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 3 are 1,2,
Wherein, g=a, b, c.
Present embodiment can inherently ensure that circulation average value is zero by the method for salary distribution of above-mentioned on off sequence,
To guarantee the normal operation of system.
Specific embodiment 2: present embodiment is to wind-electricity integration three-level converter described in specific embodiment one
Control method for parallel be described further, in present embodiment, by taking the reference vector in 7 cell of the sector I as an example, such as Fig. 2 institute
Show, then can determine that nearest a basis vector in 7 cells for synthesizing the reference vector is respectively V37, V38, V49, correspond to
Action time of three basis vectors be respectively T37、T38、T49.The on off sequence of reference vector are as follows: 310-320-321-421-
321-320-310, as shown in Figure 3.
In five-level switch magnetic sequence, even number state of value is directly divided equally, and odd number state of value will affect circulation variation tendency.
That is:
If five level states 1 are divided into three level states 0 and 1 (01 combination), the two state difference is -1 (0-1=-1), meeting
Circulation is caused to reduce；If five level states 1 are divided into three level states 1 and 0 (10 combination), the two state difference is 1 (1-0=1),
It will lead to circulation increase.
If five level states 3 are divided into three level states 1 and 2 (12 combination), the two state difference is -1 (1-2=-1), meeting
Circulation is caused to reduce；If five level states 3 are divided into three level states 2 and 1 (21 combination), the two state difference is 1 (2-1=1),
It will lead to circulation increase.
Therefore, in the case where instantaneous circulation is inevitable, the basic ideas for controlling circulation be exactly be used alternatingly it is different
The combination of three level states, change circulation will not facing one direction always, so that it is guaranteed that circulation average value is zero.Specific distribution
Mode is as shown in figure 4, in figure, and in first switch periods, the method for salary distribution of five level states 1 is 1,0, then second switch week
Interim, the method for salary distribution of five level states 1 is 0,1 under corresponding action time；The method of salary distribution of five level states 3 is 2,1, then the
In two switch periods, the method for salary distribution of five level states 3 is 1,2 under corresponding action time.Either A, B or C phase, can
Guarantee that alternate circulation returns to numerical value of period when starting at the end of this switch periods.Two continuous switch periods are mutually tied
It closes, it is ensured that circulation average value is zero.By taking A phase as an example, in first switch periods, the alternate circulation average value of A phase is positive,
And be negative in second switch periods inner ring levelling mean value, so circulation average value is zero in two continuous switch periods.Altogether
The analytic process of modular ring stream is as shown in Figure 5.As shown in Figure 5, in two continuous switch periods, it can be ensured that common mode loop levelling
Mean value is zero.
Under the premise of using same switch frequency, the output electric current of present embodiment and traditional crisscross parallel method is always abnormal
Become (THD) correlation curve as shown in fig. 6, in the present embodiment, the switching frequency used is 3600Hz.As seen from the figure, it is arbitrarily adjusting
Under system ratio, the corresponding output current quality of present embodiment the method is all much better than crisscross parallel method, sufficiently demonstrates this
Improvement of the embodiment method for output current quality.
Under the premise of using same switch frequency, present embodiment the method and traditional crisscross parallel method institute are used
The common mode circulation correlation curve of generation is as shown in Figure 7.As seen from the figure, under any modulation ratio, present embodiment the method pair
The common mode circulation virtual value answered is both less than crisscross parallel method, sufficiently demonstrates suppression of the present embodiment method for common mode circulation
Effect processed.
Claims (4)
1. the control method for parallel of wind-electricity integration three-level converter, this method are as follows:
Two three-level converters in parallel are collectively regarded as five level systems, are modulated using traditional five level space vectors
Method generates five-level switch magnetic sequence corresponding with reference vector in a switch periods,
It is characterized in that,
Five level states in five-level switch magnetic sequence are distributed to two three level corresponding to three-level converter in parallel
In on off sequence, distribution principle is as follows:
Five level states that numerical value in five-level switch magnetic sequence is even number are equally divided into two three level states,
Five level states that numerical value in five-level switch magnetic sequence is odd number are divided into two three level states, this two three level shapes
State constitutes a state group, and state absolute value of the difference is minimum in the state group, all state differences is averaged in same switch periods
Value is that every phase circulation average value is 0 in 0 and two neighboring switch periods, and wherein state difference is two three electricity in a state group
The difference of level state；
Two three-level converters in parallel are modulated respectively using two tri-level switch sequences, so that in parallel two
Three-level converter generates the current quality for being equivalent to five-level converter, and the average differential mode of parallel system and common mode circulation are
Zero.
2. the control method for parallel of wind-electricity integration three-level converter according to claim 1, which is characterized in that
Numerical value is that five level states of even number include 0,2 and 4,
Five level states that numerical value is 0 are divided into three level states that two values are 0,
Five level states that numerical value is 2 are divided into three level states that two values are 1,
Five level states that numerical value is 4 are divided into three level states that two values are 2；
Numerical value is that five level states of odd number include 1 and 3,
Five level states that numerical value is 1 are divided into three level states that numerical value is 0 and numerical value is 1,
Five level states that numerical value is 3 are divided into three level states that numerical value is 1 and numerical value is 2.
3. the control method for parallel of wind-electricity integration three-level converter according to claim 2, which is characterized in that
In two neighboring switch periods, the numerical value allocation order of identical five level state of odd number is opposite under same action time.
4. the control method for parallel of wind-electricity integration three-level converter according to claim 3, which is characterized in that
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 1 are 0,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 1 are 1,0；
In i-th of switch periods, action time TgWhen the five level state allocation orders that lower numerical value is 3 are 2,1,
Then in i+1 switch periods, action time TgThe five level state allocation orders that lower numerical value is 3 are 1,2, wherein g=
a,b,c。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115313886A (en) * | 2022-10-09 | 2022-11-08 | 武汉新能源接入装备与技术研究院有限公司 | Interleaving parallel five-level converter space vector modulation method and system |
| CN115313886B (en) * | 2022-10-09 | 2023-01-17 | 武汉新能源接入装备与技术研究院有限公司 | Interleaving parallel five-level converter space vector modulation method and system |
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