CN105406708B - Parallel connection type dual stage matrix converter widens the control method of input side reactive power adjustable range - Google Patents
Parallel connection type dual stage matrix converter widens the control method of input side reactive power adjustable range Download PDFInfo
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Abstract
The invention discloses the control methods that a kind of parallel connection type dual stage matrix converter widens input side reactive power adjustable range, when system underloading or zero load, adjust the method for salary distribution of two dual stage matrix converter modular units in parallel to load active power, circulating power is constructed between the modules, increase the sum of the absolute value of two dual stage matrix converter modular unit active power in parallel, parallel connection type dual stage matrix converter system is set to have the ability for providing enough reactive powers in input side, to offset capacitive reactive power caused by input filter capacitor, so that parallel connection two-stage Matrix Converter System can be in full power range, that is nominal load, underloading is even unloaded, and under energy feedback state, can be 1 by input power factor correction.
Description
Technical field
The present invention relates to a kind of control methods of matrix converter, more particularly to a kind of parallel connection type dual stage matrix converter
The control method that input side reactive power is adjusted under underloading or idle condition belongs to power electronic technique and control technology neck
Domain.
Background technology
In recent years, the stage type matrix for being based on the concept development of matrix converter (matrix converter, MC) and coming
Converter (two stage matrix converter, TSMC), obtains the extensive and lasting concern of domestic and foreign scholars and grinds
Study carefully, there are the remarkable advantages such as compact-sized, switching loss is low, power density is high.TSMC has discrete rectification stage and inverse cascade
Structure also has the change of current simple, rectification stage can realize the advantages such as zero current transition compared with traditional MC.
Modularization topology unit with identical inner structure is extended by way of series and parallel, is industrial
The mode of the common converter apparatus power capacity that is multiplied.It is common such as inverter parallel, straight convertor series connection, cascade
Or the forms such as parallel connection.About the series parallel topology structure and its control method of TSMC, existing research is also fewer.Chinese patent
CN102790536A proposes a kind of topological structure of double TSMC crisscross parallels and its basic control method.Parallel connection type TSMC institutes
The changer system of composition have many advantages, such as realize power capacity multiplication, by staggeredly driving reduce output voltage and
The high frequency ripple of input current forms redundancy backup between each module, it can be achieved that fault-tolerant operation etc..
In the topological structure of parallel connection type, each module load-sharing power of control or electric current are generally required, TSMC also not examples
Outside.But strategy is divided equally using simple bearing power to TSMC parallel systems, under underloading or idle condition, there are input powers
The relatively low problem of factor.It is well known that there are many restrictions for the reactive power adjustable range of TSMC input sides.First, general feelings
Require input current control vector and the angle of input voltage vector no more than ± 30 ° under condition, otherwise DC bus is easy out
Existing short circuit, by adjusting control strategy, at the time of DC bus negative pressure will occur, while on transrectification grade and inverse cascade
The drive signal of down tube can expand angle of regulation range (being more than ± 30 °), but requirement of this strategy to voltage detecting precision
It is higher, realize difficulty it is larger.Secondly when the reactive power (absolute value) of TSMC input sides increases, the maximum voltage transmission of outlet side
Than will accordingly reduce, to ensure that output voltage is constant, input side reactive power can not be excessive.Further, since TSMC rectifications
Grade is only capable of directly controlling the angle of input current vector, and the amplitude of input current depends on active point of load current
Amount, therefore when active power of output is lighter, the amplitude of input current also very little.It is defeated when outlet side zero load under extreme case
It is zero to enter side current amplitude, adjusts angle in any case, the active power and reactive power of TSMC input terminals are zero, this feelings
Under condition, source current only has capacitive reactive power component caused by filter capacitor, i.e. source current is not zero, but its power factor is
Zero.
Have benefited from design feature specific to parallel connection type TSMC systems, the present invention proposes a kind of based on the control of intermodule circulation
Input side Reactive Power Control strategy so that parallel connection type TSMC systems can be controlled neatly when underloading is even unloaded
Input power factor correction is 1 by the size of input side reactive power.
Invention content
Input side reactive power, which is widened, the purpose of the present invention is to provide a kind of parallel connection type dual stage matrix converter adjusts model
The control method enclosed makes it either under conditions of nominal load, or underloading or zero load, can will be inputted in outlet side
Side PFC is 1.
To achieve the above object, the present invention uses following technical scheme：
A kind of parallel connection type dual stage matrix converter widens the control method of input side reactive power adjustable range, when system is light
When carrying or is unloaded, the method for salary distribution of two dual stage matrix converter modular units in parallel to load active power is adjusted, in mould
Circulating power is constructed between block, increases the sum of the absolute value of two dual stage matrix converter modular unit active power in parallel,
Parallel connection type dual stage matrix converter system is set to have the ability for providing enough reactive powers in input side, to offset input filter electricity
Capacitive reactive power caused by holding, so that parallel connection two-stage Matrix Converter System can be in full power range, i.e. volume
Can be 1 by input power factor correction under fixed load, underloading even zero load and energy feedback state.
Specific method is：
First, set one with systematic parameter related output power threshold value P0, P0Expression formula it is as follows：
In formula, ωsFor input voltage angular frequency, CsFor input side filter capacitor, UinFor input voltage virtual value,For
The maximum value for the input angle adjustable range that system is allowed.Hereafter to state conveniently, Q is remembered0=3 ωsCsUin 2。
In parallel connection type topological structure two TSMC modular units be denoted as respectively the first dual stage matrix converter modular unit M and
Second dual stage matrix converter modular unit S.If under some steady operational status, the total active power of outlet side is p, passes through control
Make the adjusting of strategy so that the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S are respectively
The active power shared is pMAnd pS, p, pMAnd pSSymbolic indication flow of power direction, it is positive to indicate active power from TSMC's
Input the flowing of lateral outlet side, it is negative then indicate active power from the output side of TSMC to input side flowing.Meanwhile adjusting first pair
The input power factor control of the input side of grade matrix converter modular unit M and the second dual stage matrix converter modular unit S
Angle is respectivelyWith(angle of given current phasor and input voltage vector, electric current are ahead of voltage and are just, to lag
It is negative).According to the size of p, pM、pSWithThe different methods of salary distribution is selected respectively：
1) as p >=2P0Or p<-2P0When, M and S mean allocation bearing powers, i.e. pM=pS=p/2, and closed by appropriate
Ring controlling unit adjusts input reactive power component, and it is 1 to make input power factor, similar with traditional control strategy at this time.
The pressure drop for ignoring input side filter inductance, then when stable state
2) as -2P0≤p<2P0When, construct the function P about output power pM(p)、PS(p) and ΦM(p)、ΦS(p), make
It meets condition：
This is a quaternary Second-order Nonlinear Equations, theoretically can whether there is or not array solutions, in order to improve feasibility and stabilization
Property, it can be concentrated in solution and add some qualifications, such as require PM(p)、PS(p) and ΦM(p)、ΦS(p) it all must be continuous function
Deng.A particular solution for meeting condition is given below.
Pass through control so that when stable state, the first dual stage matrix converter modular unit M and the second dual stage matrix converter mould
The output power and input side vector angle and P of module unit SM(p)、PS(p) and ΦM(p)、ΦS(p) match, i.e.,
3) particularly, work as p=0, i.e., when unloaded, can control the output power of the first dual stage matrix converter modular unit M
For pM=P0/ 2, and the output power of S is pS=-P0/ 2, sum of the two zero.Reality output and power input is active at this time
Power is zero, but there is the active power of circulation between the modules.Under Traditional control strategy, when active power of output is zero,
The active and reactive power of input side is all only zero；And in the present invention, just because of the ring for having constructed this " groundless "
Flow active power so that the adjusting of input side reactive power is possibly realized.When stable state, the input power factor control of two modules
Angle is equal, but direction is on the contrary, i.e.
By above-mentioned control strategy, parallel connection type TSMC systems are when bearing power is higher, mean allocation between parallel module
Load active power；When bearing power is lighter or even unloaded, then in intermodule by constructing appropriately sized circulation active power,
Compared to system nominal power, the amplitude very little of circulating power influences system effectiveness little；By this strategy, make TSMC
Input side reactive power has the condition that " can be depended on " always, to ensure that it is single that TSMC systems in parallel can be realized in full power range
Position PFC.
A particular solution for meeting control condition is as follows：
The beneficial effects of the invention are as follows：The parallel connection type dual stage matrix converter of the present invention widens the adjusting of input side reactive power
The control method of range becomes when the bearing power of parallel connection type dual stage matrix converter is smaller in two two-stage matrixes in parallel
The loop current of certain amplitude is constructed between parallel operation.At this time the algebraical sum of two dual stage matrix converter input side active power with
Bearing power is equal, does not change, but the sum of its absolute value increases.Due to the input side electric current of two dual stage matrix converters
Active component all increase, thus under identical offset angle, the reactive component of bigger can be generated, to improve nothing
The adjustable range of work(power enables parallel connection type dual stage matrix converter (nominal load, underloading, zero load in full power range
And energy feedback state) realize unity power factor correction.By above-mentioned control method, parallel connection type TSMC systems are in load work(
When rate is higher, mean allocation load active power between parallel module；It is when bearing power is lighter or even unloaded, then logical in intermodule
It crosses and constructs appropriately sized circulation active power, compared to system nominal power, the amplitude very little of circulating power, to system effectiveness
It influences little；By this strategy, TSMC input sides reactive power is set to have the condition that " can be depended on " always, to ensure parallel connection
TSMC systems can realize unity power factor correction in full power range.
Description of the drawings
Fig. 1 is the topological structure schematic diagram of double parallel type dual stage matrix converter；
Fig. 2 is the functional image of power distribution and total active power of output relationship between dual stage matrix converter unit；
Fig. 3 is the functional arrangement of dual stage matrix converter unit input side control vector angle and total active power of output relationship
Picture；
Fig. 4 is double parallel type dual stage matrix converter outlet side closed-loop control schematic diagram；
Fig. 5 is double parallel type dual stage matrix converter input side power factor control schematic diagram.
Specific implementation mode
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
(1) basic principle
The topological structure of the main power section of parallel connection type dual-level matrix frequency converter is as shown in Figure 1, including two twin-stages
Matrix converter unit is denoted as the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S,
The two is using shared input LC filters, LsAnd CsThe respectively inductance and capacitance of input filter, input voltage angular frequency
It is respectively ω with virtual valueinAnd Uin；Outlet side uses the three winding isolating transformer of star-like connection, and transformer is by the first twin-stage
It is exported after the superposition of the output voltage of matrix converter modular unit M and the second dual stage matrix converter modular unit S, then passes through LC
Filter filters out high frequency voltage ripple, LfAnd CfThe respectively inductance and capacitance of output filter；First dual stage matrix converter
Modular unit M and the second dual stage matrix converter modular unit S reduce output voltage and input current using type of drive of interlocking
In switching harmonics.Using three winding formula isolating transformer, the first dual stage matrix converter modular unit M and second pair can avoid
Zero sequence circulation between grade matrix converter modular unit S makes the change of current of TSMC and controls more easy.
In order to ensure TSMC systems in parallel (nominal load, underloading, zero load and energy feedback shape in full power range
State) it can ensure that input side PFC is 1, it needs in system underloading or zero load, adjustment the first two-stage matrix transformation
The bearing power allocation proportion of device modular unit M and the second dual stage matrix converter modular unit S, by the side for constructing circulation
Formula, in order to control system provide input side PFC possibility.
Firstly, it is necessary to determine the boundary of so-called system underloading, i.e., in much power hereinafter, system is underloading, using tradition
Control strategy can not make input side PFC be 1.The item of filter inductance both ends pressure drop in ignoring input filter
Under part, it is believed that, input side PFC seeks to make TSMC input terminals generate inductive reactive power work(by control strategy
Rate Q offsets the capacitive reactive power Q produced by filter capacitor0。Q0Size have with input frequency, the parameters such as filter capacitor size
It closes, under steady state conditions, a reactor, expression formula is as follows：
Q0=3 ωsCsUin 2。
The control of TSMC input terminal reactive powers is generally by input side current space vector in change modulated process
AngleCome what is realized, if outlet side active power is p, traditional power-sharing is used in single machine TSMC systems or parallel connection TSMC
When control strategy, the active power of input side is equal with the active power of outlet side, reactive power q, as follows：
In above formula,Adjusting range be limited to the factors such as voltage transfer ratio and DC bus-bar voltage direction, it is assumed that two
The input angle tune of TSMC modules the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S
Adjusting range isThen under Traditional control strategy, when can realize unity power factor correction, TSMC outlet side wattful powers
Rate must be more than threshold value P0, expression formula is as follows：
If TSMC modules the first dual stage matrix converter modular unit M's and the second dual stage matrix converter modular unit S
Active power is respectively pMAnd pS, when the absolute value of the output power of TSMC systems in parallel is less than P0When, it can be by constructing circulation
Mode increases module pMAnd pSAbsolute value, so that it is met following condition：
Meanwhile if the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S input sides
Controlling vector angle is respectivelyWithWhen stable state,WithFollowing condition need to be met：
Pass through above-mentioned condition expression formula, it can be seen that modulated variable there are 4, is more than its constraints, therefore theoretical
On power allocation scheme and adjustment vector angle can construct countless multigroup solutions.But in practical applications, it is typically desirable to pM、
pSWithValue all with p consecutive variations because being once mutated, may result in system concussion unstability.
For this purpose, appropriate expand carries out the range that active power distribution is adjusted, if the first dual stage matrix converter mould when stable state
The active power of module unit M and the second dual stage matrix converter modular unit S with TSMC systems in parallel total active power of output p
The rule of variation is respectively formed function PM(p) and PS(p).A kind of specific allocation plan can be as follows with formulae express：
On the basis of above-mentioned power allocation scheme, the first dual stage matrix converter modular unit M and the second two-stage matrix
The rule that the input side control vector angle of converter module cell S changes with total active power of output p of TSMC systems in parallel
It is respectively formed function phiM(p) and ΦS(p)。
PM(p)、PS(p) and ΦM(p)、ΦS(p) functional image difference is as shown in Figures 2 and 3, it can be seen from the figure that
Four set of segmentation functions are continuous.
(2) closed-loop control example
In the concrete application occasion that the present invention is illustrated, the modulation of TSMC can be used classical Double Space Vector Modulation side
Method makees double PI closed-loop controls based on synchronous rotating frame (dq axis), as shown in Figure 4 to output voltage.In figure, outer shroud control
The dq axis components of output voltage, wherein uodAnd uoqThe dq axis components of voltage feedback value respectively on output filter capacitor,WithThe respectively specified rate of output voltage；Inner ring controls the dq axis components of TSMC output end currents, the first dual stage matrix converter
The current inner loop of modular unit M and the second dual stage matrix converter modular unit S separate independent control, wherein iMfdAnd iMfqRespectively
For the dq axis components of module M output current values of feedback,WithRespectively its specified rate；iSfdAnd iSfqRespectively module S is defeated
Go out the dq axis components of current feedback values,WithRespectively its specified rate.The dq axis output quantities of outer voltage are denoted as respectivelyWithObviously, When stable state,Ignore the impedance loss in filter inductance
When, the d axis components of the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S output currents
Relationship with respective active power of output is：
The q axis components of output current do not contribute active power, therefore can enableWithAlways equal；And it adjustsWithValue i may make by the autoregulation of inner ringMfdAnd iSfdIts specified rate is followed to change respectively, accordingly
Active power of output also adjusts therewith.WithAdjusting formula it is as follows：
Input side PFC link is as shown in figure 5, whereinAnd iiqRespectively source current is sat in synchronous rotary
The given value and value of feedback of the lower q axis components of mark system obtain total idle needed for TSMC systems input side in parallel by PI controlling units
The desired value Q of power*, the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S are each at this time
It is respectively from the reactive power size that should be provided：
Wherein,
To the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S input side controls
Vector angle processed is respectively：
When system reaches stable state, will haveWith
By above-mentioned Closed-loop Control Strategy, output voltage can be obtained reliable and stable control, while reasonable distribution TSMC
The real power component of module the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S, and
And it can be to realize input side unity power factor correction in full power range.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of parallel connection type dual stage matrix converter widens the control method of input side reactive power adjustable range, feature exists
In：When system underloading or zero load, adjusts two dual stage matrix converter modular units in parallel and load active power is divided
With mode, circulating power is constructed between the modules, increases two dual stage matrix converter modular unit active power in parallel
The sum of absolute value makes parallel connection type dual stage matrix converter system have the ability for providing enough reactive powers in input side, to support
Disappear capacitive reactive power caused by input filter capacitor, so that parallel connection two-stage Matrix Converter System can be in total power
In range, i.e., can be 1 by input power factor correction under nominal load, underloading even zero load and energy feedback state.
2. parallel connection type dual stage matrix converter as described in claim 1 widens the controlling party of input side reactive power adjustable range
Method, it is characterised in that：Two dual stage matrix converter modular units in parallel are respectively the first dual stage matrix converter module list
First M and the second dual stage matrix converter modular unit S, the method for salary distribution of load active power is indicated by following formula：
In formula, p is total active power of parallel system output, pMAnd pSRespectively the first dual stage matrix converter modular unit M and
The active power that second dual stage matrix converter modular unit S respectively shares；p、pMAnd pSSymbolic indication flow of power side
To, it is positive to indicate that active power is flowed from the input side of TSMC to outlet side, it is negative then indicate active power from the output side of TSMC to
Input side flows；PM(p) and PS(p) it is two functions about p；P0Be with the relevant threshold value of systematic parameter, expression formula is such as
Under：
In formula, ωsFor input voltage angular frequency, CsFor input side filter capacitor, UinFor input voltage virtual value,For system
The maximum value for the input side control vector angle adjustable range allowed.
3. parallel connection type dual stage matrix converter as claimed in claim 2 widens the controlling party of input side reactive power adjustable range
Method, it is characterised in that：The power distribution mode of parallel connection type dual stage matrix converter system is as follows：
1) as p >=2P0Or p≤- 2P0When, the first dual stage matrix converter modular unit M and the second dual stage matrix converter module
Cell S mean allocation bearing power；
2) as -2P0<p<2P0When, the first dual stage matrix converter modular unit M and the second dual stage matrix converter modular unit S
No longer mean allocation bearing power, by way of constructing circulation so that the first dual stage matrix converter modular unit M and second
The sum of active power absolute value of dual stage matrix converter modular unit S is consistently greater than or is equal to P0；
3) when p=0 is unloaded, pM=-pS=P0/ 2, sum of the two zero；The wattful power of reality output and power input at this time
Rate is zero, but there is the active power of circulation between the modules.
4. parallel connection type dual stage matrix converter as claimed in claim 2 widens the controlling party of input side reactive power adjustable range
Method, it is characterised in that：Two dual stage matrix converter modular units in parallel are in stable state, input side power factor controlling angle
Degree is indicated by following formula：
In formula, Q0=3 ωsCsUin 2。
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|---|---|---|---|---|
| TW201308848A (en) * | 2011-08-04 | 2013-02-16 | Chung-Ming Young | A single-stage high step-up AC-DC matrix converter based on Cockcroft-Walton voltage multiplier with power factor correction |
| CN103236783A (en) * | 2013-04-02 | 2013-08-07 | 南京航空航天大学 | Method for expanding adjusting range of power factor angle of two-stage matrix converter |
| CN103296956A (en) * | 2013-05-29 | 2013-09-11 | 南京航空航天大学 | Two-stage matrix converter based starting/generating system and control method thereof |
| CN103427666A (en) * | 2013-07-23 | 2013-12-04 | 南京航空航天大学 | Carrier modulation method of two-stage matrix converter |
| CN104410289A (en) * | 2014-11-28 | 2015-03-11 | 南京航空航天大学 | Driving power source circuit of twin-stage matrix converter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201308848A (en) * | 2011-08-04 | 2013-02-16 | Chung-Ming Young | A single-stage high step-up AC-DC matrix converter based on Cockcroft-Walton voltage multiplier with power factor correction |
| CN103236783A (en) * | 2013-04-02 | 2013-08-07 | 南京航空航天大学 | Method for expanding adjusting range of power factor angle of two-stage matrix converter |
| CN103296956A (en) * | 2013-05-29 | 2013-09-11 | 南京航空航天大学 | Two-stage matrix converter based starting/generating system and control method thereof |
| CN103427666A (en) * | 2013-07-23 | 2013-12-04 | 南京航空航天大学 | Carrier modulation method of two-stage matrix converter |
| CN104410289A (en) * | 2014-11-28 | 2015-03-11 | 南京航空航天大学 | Driving power source circuit of twin-stage matrix converter |
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