CN110380636A - The control method of power-converting device and power-converting device - Google Patents
The control method of power-converting device and power-converting device Download PDFInfo
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- CN110380636A CN110380636A CN201910292624.8A CN201910292624A CN110380636A CN 110380636 A CN110380636 A CN 110380636A CN 201910292624 A CN201910292624 A CN 201910292624A CN 110380636 A CN110380636 A CN 110380636A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4833—Capacitor voltage balancing
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The power-converting device of embodiment has control device (10), the control device (10) has the mechanism for switching and implementing the 1st control model and the 2nd control model, under the 1st control model, the voltage instruction value of new each phase obtained from zero phase voltage for being superimposed the power converter (100) according to the voltage instruction value of each phase to power converter (100) generates above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage instruction value, under the 2nd control model, the voltage instruction value and its maximum value and minimum value of each phase based on above-mentioned power converter (100), generate above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage instruction value.
Description
The application is advocated excellent based on Japanese patent application 2018-076721 (applying date: on April 12nd, 2018)
It first weighs, the application includes all the contents of the application by referring to this application.
Technical field
Embodiments of the present invention are related to the control method of power-converting device and power-converting device.
Background technique
Inverter or converter are also referred to as with the power converter converted is exchanged to direct current, by wide in society
It is used in general field.Most basic inverter is 2 level (level) inverter formed by 2 thyristors, is used
1 pin exports 2 voltage levels.
On the other hand, there are following such neutral point clamper type (NPC (Neutral-Point-Clamped)) inversions
Device: as shown in fig. 7, according to each phase, have 4 thyristors in 1 pin and 2 diodes (are also possible to half
Conductor switch element), the DC partial voltage capacitor shared with each phase.The NPC inverter by three-phase is illustrated in Fig. 7
The example of 100 power-converting devices 1 constituted.NPC inverter 100 can export 3 voltage levels with 1 pin, be conducive to
High voltage, loss reduce, high frequency reduces, so being used in various inverters.
In the example of fig. 7, NPC inverter 100 has 6 thyristor S in 1 pin according to each phase1
~S6, have DC voltage vPNThe DC partial voltage capacitor C of partial pressure1、C2.Here, if DC partial voltage capacitor C1、C2In
Property point NP current potential be vn.The neutral point potential v of NPC inverter 100nPossess the movement with inverter and is become with 3 times of fundamental wave
Dynamic property.If neutral point potential vnVariation it is larger, then the variation in voltage on thyristor is acted on, in electricity
It is possible to be possible to not reach desired voltage and became when voltage is lower because being more than pressure resistance due to component wear when pressing higher
Modulation.
Neutral point potential vnVariation size it is related with modulation rate and power factor, capacitor capacitance, load current.?
If capacitor capacitance and load current calculate for certain value by modulation rate and power factor bring neutral point potential vnChange
When dynamic size, indicated as the curve graph of Fig. 8.In fig. 8, power factor is expressed as the phase difference of voltage and electric current.It can
Know that modulation rate is higher, furthermore power factor is lower (closer to phase difference=pi/2), neutral point potential vnVariation it is bigger.
Inhibit neutral point potential vnThe simplest method of variation be to increase capacitor capacitance.But capacitor is electric
The increase of appearance leads to the increase of the volume, cost of inverter, and energy when accident also becomes larger.
Neutral point potential vnVariation can be inhibited by control.In general, the instruction of each phase of NPC inverter
Value is 1, but has use voltage instruction value v using upper branch (arm) as shown in Figure 9upWith lower branch voltage instruction value vunThis 2
A method.Upper branch voltage instruction value vupIt is the thyristor S to the upper half positioned at each branch in Fig. 71、
S2、S5The instruction value of imparting, lower branch voltage instruction value vunIt is to open the semiconductor of the lower half positioned at each branch in Fig. 7
Close element S3、S4、S6The instruction value provided.
It is indicated by taking the instruction value of u phase as an example in Fig. 9.By by upper branch voltage instruction value vupWith upper carrier wave
carpIt is compared processing, the thyristor S to upper branch can be obtained1、S2、S5The grid signal of imparting.Another party
Face, by by lower branch voltage instruction value vunWith lower carrier wave carnIt is compared processing, the semiconductor to lower branch can be obtained
Switch element S3、S4、S6The grid signal of imparting.Upper carrier wave carpChange between modulation rate 0~1, lower carrier wave carnIt is modulating
Change between rate -1~0.
The upper branch voltage instruction value v of three-phaseipAnd lower branch voltage instruction value vin(wherein, i=u, v, w) pass through
Formula (1) below finds out.
Here, min is the function for finding out the minimum value in independent variable, and max is the function for finding out maximum value.
For example, in the voltage instruction value v for having three-phase shown in Figure 10 Au、vv、vwIn the case where, by the voltage instruction value of u phase
vuIt is converted as Figure 10 B by formula (1).In turn, by upper carrier wave car shown in Figure 10 CpWith upper branch voltage instruction value
vupComparison processing and lower carrier wave carnWith lower branch voltage instruction value vunComparison processing, obtain as Figure 10 D
The u phase output voltage v of PWM wave shapeuout。
If calculate in the case where applying the modulation method of the control by modulation rate and power factor bring neutral point
The size of the variation of current potential, then indicate as the curve graph of Figure 11.I.e., it is known that can press down completely in certain operation range
The variation of neutral point potential processed.
But if the PWM waveform of observation Figure 10 D, there is the switch element group of upper branch and the switch element of lower branch
The section that group all switchs.In common modulation method, only the switch element group of upper branch and the switch of lower branch are first for NPC inverter
Some of part group is switched, but is both switched in the section, so switching frequency is double.The section is due to being 1
The 1/3 of period, so fifty-fifty the switching frequency of inverter increases to 1.33 times.Then, lead to the increase of switching losses.This
Outside, in order to solve the situation, the cooling device enlargement of inverter, cost is got higher.In addition, the operating cost of inverter also increases
Add.
Because of this, wishing to propose to inhibit the variation of neutral point potential in bigger operating space and inhibit to switch
The technology of the increase of loss.
Summary of the invention
The power-converting device of technical solution has: the power converter of neutral point clamper type；And control device, pass through
The 1st switch element group and the 2nd switch element group to each phase for constituting above-mentioned power converter assign respectively uses above-mentioned electric power
The 1st voltage instruction value and the 2nd voltage instruction value that the voltage instruction value of each phase of converter generates carry out that above-mentioned electric power is inhibited to become
The control of the variation of the neutral point potential of parallel operation, above-mentioned control device have the mechanism for switching and implementing control model below:
1st control model is superimposed zero phase voltage of the power converter according to the voltage instruction value of each phase to above-mentioned power converter
Obtained from new each phase voltage instruction value, generate above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage instruction value；And the 2nd
Control model, the voltage instruction value and its maximum value and minimum value of each phase based on above-mentioned power converter generate above-mentioned 1st electricity
Press instruction value and above-mentioned 2nd voltage instruction value.
Detailed description of the invention
Fig. 1 is the figure for indicating an example of NPC inverter of the 1st embodiment.
Fig. 2 is to indicate that the neutral point potential of the embodiment changes the figure for inhibiting an example of functional structure of control.
Fig. 3 is to indicate that the neutral point potential based on the superposition of zero phase voltage of the embodiment changes the movement for inhibiting control
The figure of an example.
Fig. 4 is the figure for indicating an example of the variation of the neutral point potential based on the superposition of zero phase voltage of the embodiment.
Fig. 5 is to indicate that the carrier wave of the 3rd embodiment compares the block figure of an example of the functional structure of processing.
Fig. 6 is to indicate that the carrier wave of the embodiment compares the figure of an example of the waveform of processing.
Fig. 7 is the figure for indicating an example of circuit of NPC inverter in the prior art.
Fig. 8 is the figure for indicating an example of variation of neutral point potential in the prior art.
Fig. 9 is to indicate that the neutral point potential based on the prior art changes the figure for inhibiting an example of modulator approach of control.
Figure 10 A, Figure 10 B, Figure 10 C and Figure 10 D are to indicate that the neutral point potential based on the prior art changes to inhibit control
The figure of an example of modulation waveform.
Figure 11 is to indicate that the neutral point potential based on the prior art changes an example for inhibiting the neutral point potential of control to change
Figure.
Specific embodiment
Hereinafter, being explained with reference to embodiment.
[the 1st embodiment]
Firstly, the 1st embodiment is illustrated.Hereinafter, the explanation with the common part of above-mentioned previous structure is omitted,
It is illustrated centered on different parts.
Fig. 1 is the figure for indicating an example of the structure of power-converting device of the 1st embodiment.In addition, in the Fig. 1, it is right
Identical label is assigned with above-mentioned Fig. 7 common element.
The NPC inverter 100 for constituting power-converting device 1 is NPC inversion with the same common three-phase of that shown in Figure 7
Device.But it is not limited to the example.For example, being illustrated in the present embodiment as the power converter of neutral point clamper type
NPC inverter, but NPC converter can also be replaced with and implemented.In addition, neutral point clamper is either T-type midpoint is clamped
Position, the type being also possible to other than it.
In the power-converting device 1, it is also equipped with the control usually acted for carrying out NPC inverter 100 and inhibits neutral
Point current potential vnVariation control (hereinafter referred to as " neutral point potential change inhibit control ") control device 10.
Control device 10 passes through the thyristor S to each phase for constituting NPC inverter 1001、S2、S5(it is located at each
1st switch element group of the upper half of branch) and thyristor S3、S4、S6(the positioned at the lower half of each branch the 2nd opens
Close element group) the voltage instruction value v for using each phase of NPC inverter 100 is assigned respectivelyu、vv、vwAnd the 1st voltage instruction generated
Value and the 2nd voltage instruction value, to carry out the control of NPC inverter 100 usually acted and inhibit neutral point potential vnChange
Dynamic control.
In particular, the control device 10 has the function of switching the 1st control model and the 2nd control model to implement, it is described
1st control model is according to the voltage instruction value v of each phase to NPC inverter 100u、vv、vwIt is superimposed the zero of the NPC inverter 100
The voltage instruction value of new each phase obtained from phase voltage, branch voltage instruction value (the 1st voltage instruction value) v in generationup、
vvp、vwpWith lower branch voltage instruction value (the 2nd voltage instruction value) vun、vvn、vwn, the 2nd control model is based on NPC inversion
The voltage instruction value v of each phase of device 100u、vv、vw, its maximum value and minimum value, upper branch electricity consumption is generated using above-mentioned formula (1)
Press instruction value vup、vvp、vwpWith lower branch voltage instruction value vun、vvn、vwn。
For example, control device 10 is in the 1st control model, in the voltage instruction value for each phase for being superimposed zero phase voltage
In the case that the modulation rate of some is more than defined range (such as modulation rate smaller than 1 and bigger than -1 range), carry out to the 2nd
The switching of control model.On the other hand, in the 2nd control model, if being superimposed the voltage instruction of each phase of zero phase voltage
Whole modulation rates of value converge on defined range, then carry out the switching to the 1st control model.
It changes and inhibits in control in the neutral point potential based on the 2nd control model for having used formula (1), as described above,
The variation of neutral point potential can fully be inhibited in certain operation range, but only by the control, in opening for upper branch
Close element group S1、S2、S5With the switch element group S of lower branch3、S4、S6In the section that this two side is switched, switching frequency increases
Add, so switching losses increase.So in the present embodiment, in the voltage instruction value for each phase for being superimposed zero phase voltage
Modulation rate all converge on regulation in the range of during (during being not ovennodulation), carry out based in the 1st control model
Property point potential change inhibit control.In the 1st control model, the switch element group S of not upper branch1、S2、S5With lower branch
Switch element group S3、S4、S6Both the section switched.Thereby, it is possible to inhibit neutral point potential to become in bigger operating space
While dynamic, the increase of loss is suppressed to bottom line.
Fig. 2 is the control device 10 for indicating to have in the power-converting device 1 based on present embodiment, NPC inverter
100 neutral point potential changes the figure for inhibiting an example of functional structure of control.But the structural example is an example, is not limited
In the example.
Control device 10 as shown in Fig. 2, have as various functions zero phase voltage superposition processing portion 11, determination unit 12,
13, operational part 14~18, switching part SW11, SW12, SW21, SW22.
Switching part SW21, SW22 in these elements are switched over to select in the 1st control model and the 2nd control model
One side.
Neutral point potential based on the 1st control model, which changes, to be inhibited control using zero phase voltage superposition processing portion 11, determines
Portion 12,13, switching part SW11, SW12 and switching part SW21, SW22 are realized.On the other hand, the neutral point based on the 2nd control model
Potential change inhibits control to realize using operational part 14~18 and switching part SW21, SW22.
Zero phase voltage superposition processing portion 11 has the zero phase electricity that NPC inverter 100 is calculated using the formula (2) of following presentation
It presses and by zero phase voltage to the voltage instruction value v of each phaseu、vv、vwSuperposition and as voltage instruction value vu0、vv0、vw0Output
Function.The control device 10 is also equipped in the case where there is the voltage instruction value by the superposition sign change of zero phase voltage,
The electricity of zero phase voltage after making the sign-inverted of the voltage instruction value and carrying out the calculating, will calculate again again of zero phase voltage to each phase
Press instruction value superposition and as voltage instruction value vu0、vv0、vw0The function of output.Thereby, it is possible to press down in bigger operating space
Neutral point potential v processednVariation.In turn, which is also equipped with accords with even if in the superposition not over zero phase voltage
In the case where the voltage instruction value of number variation, also the denominator of above-mentioned formula (2) across 0 and change in the case where, makes the electricity of median
It presses the sign-inverted of instruction value and carries out the function of calculating again of zero phase voltage.Thereby, it is possible to prevent by the denominator of formula (2) across
More 0 and zero excessive phase voltage occurs, and make change inhibit control normally act on.
In zero phase voltage superposition processing portion 11, use formula below (2).
Wherein, vu、vv、vwIndicate the voltage instruction value for having carried out the standardized pin for each phase with 1, iu、iv、iwTable
Show the electric current exported from the pin of each phase.Sign indicates sign function.
Here, an example of the movement in zero phase voltage superposition processing portion 11 is illustrated referring to Fig. 3.
Zero phase voltage superposition processing portion 11 is based on voltage instruction value vu、vv、vwWith the output electricity obtained from NPC inverter 100
Flow iu、iv、iw, the calculating of zero phase voltage is carried out using formula (2), finds out zero phase voltage v0(S11).In addition, voltage instruction value vu、
vv、vwZero phase voltage v is also used for after having other than the calculating of median0reSituation about calculating again etc., so saving for the time being
Into defined storage region (S12).
In addition, zero phase voltage superposition processing portion 11 finds out voltage instruction value vu、vv、vwMedian (S13).
On the other hand, zero phase voltage superposition processing portion 11 is to voltage instruction value vu、vv、vwZero calculated phase is added respectively
Voltage v0, find out voltage instruction value vu0、vv0、vw0(S14).About these voltage instruction values vu0、vv0、vw0, also find out voltage and refer to
Enable value vu0、vv0、vw0Median.
Then, zero phase voltage superposition processing portion 11 determines adding zero phase voltage v0Before and after the symbol of median be
It is no to have changed (S15).Namely it is decided that adding zero phase voltage v0Before and after median symbol it is whether consistent.The two it
Between under symbol unanimous circumstances, can be considered as plus zero phase voltage v0Before and after the symbol of median do not change (S15
" no (No) ").On the other hand, in the case that symbol is inconsistent therebetween, can be considered as plus zero phase voltage v0It
Preceding and median later sign change (" being (Yes) " of S15).
In step S15, if the sign change of median (" being (Yes) " of S15), the processing to step S16
Advance.
On the other hand, in step S15, if the symbol of median does not change (" no (No) " of S15), zero phase electricity
Laminated adds the denominator of 11 implementation formula (2) of processing unit whether to cross over 0 and the judgement (S21~S23) that has changed.
Here, if power factor is bigger than 0 and denominator is not 0 or less (S21 " being (Yes) ", S22 " no (No) "),
Then zero phase voltage superposition processing portion 11 is considered as denominator and does not cross over 0 and change, the voltage instruction value that will be found out in step S14
vu0、vv0、vw0Output.On the other hand, if power factor is bigger than 0 and denominator is that 0 or less (S21 " being (Yes) ", S22 " are
(Yes) "), then zero phase voltage superposition processing portion 11 be considered as denominator across 0 and change, to the processing of step S16 advance.
In addition, if power factor is bigger than 0 and denominator be not 0 or more (S21 " no (No) ", S23 it is " no
(No) "), then zero phase voltage superposition processing portion 11 is considered as denominator and does not cross over 0 and change, the voltage that will be found out in step S14
Instruction value vu0、vv0、vw0Output.On the other hand, if power factor is bigger than 0 and denominator be 0 or more (S21 " no (No) ",
" being (Yes) " of S23), then zero phase voltage superposition processing portion 11 is considered as denominator and crosses over 0 and change, to before the processing of step S16
Into.
In step s 16, zero phase voltage superposition processing portion 11 makes the voltage instruction value v found out in step s 13u、vv、
vwMedian sign-inverted after, carry out zero calculating again for phase voltage and find out zero phase voltage v0reIt (S16), will be calculated
Zero phase voltage v0reRespectively with the voltage instruction value v that saves in step s 12u、vv、vwIt is added, finds out voltage instruction value vu0、vv0、
vw0(S17), by calculated voltage instruction value vu0、vv0、vw0Output.
In addition, the processing of above-mentioned S21~S23 be not necessarily it is necessary, also can be omitted its implementation.In this situation
Under, if median does not change in step S15 (" no (No) " of S15), zero phase voltage superposition processing portion 11 without
Zero phase voltage calculates again, the voltage instruction value v that will be found out in step S14u0、vv0、vw0Output.
In this way, making sign-inverted in the case where the sign change by being superimposed zero phase voltage median and carrying out zero
Phase voltage calculates again, obtains zero phase voltage v0re, by zero phase voltage v0reTo the voltage instruction value v of each phaseu、vv、vwSuperposition.
It suitably plays as a result, and changes inhibitory effect.
Due to the voltage instruction value v exported from zero phase voltage superposition processing portion 11u0、vv0、vw0It is 1 pipe for each phase
The instruction value of foot, so the voltage instruction value is divided into upper branch voltage instruction value v by determination unit 12, SW11 and SW12up、
vvp、vwpWith lower branch voltage instruction value vun、vvn、vwn。
Specifically, determining that modulation rate is just or to bear by determination unit 12, if modulation rate is just, to switching part
SW11, SW12 are operated respectively, so that voltage instruction value vu0、vv0、vw0As upper branch voltage instruction value vup、vvp、vwp
It exports and fixed value " 0 " is used as lower branch voltage instruction value vun、vvn、vwnOutput.On the other hand, if modulation rate is not just
(if it is negative), then operate switching part SW11, SW12, respectively so that branch voltage instruction in fixed value " 0 " conduct
Value vup、vvp、vwpOutput and voltage instruction value vu0、vv0、vw0As lower branch voltage instruction value vun、vvn、vwnOutput.
In addition, by determination unit 13, SW21 and SW22, according to the voltage instruction value exported from zero phase voltage superposition processing portion 11
vu0、vv0、vw0The modulation rate of some whether be more than range for example smaller than 1 and bigger than -1, to select the 1st control model or
2 control models.
Specifically, determining whether voltage instruction value v by determination unit 13u0、vv0、vw0Which modulation rate absolute value
It is all smaller than 1, if small, switching part SW21, SW22 are operated respectively, so that the value exported from switching part SW11 is via cutting
Portion SW21 is changed as upper branch voltage instruction value vup、vvp、vwpIt exports and from the value of switching part SW12 output via switching part
SW22 is as lower branch voltage instruction value vun、vvn、vwnOutput.In the case, the 1st control model is set.
On the other hand, if voltage instruction value vu0、vv0、vw0The modulation rate of some absolute value unlike 1, then to switching
SW21, SW22 are operated respectively in portion, so that the value exported from operational part 16 is via switching part SW21 as upper branch voltage
Instruction value vup、vvp、vwpOutput and from operational part 18 export value via switching part SW22 as lower branch voltage instruction value
vun、vvn、vwnOutput.In the case, the 2nd control model is set.
Operational part 14~18 is the element for implementing the operation of above-mentioned formula (1)." (v is calculated by operational part 14,15,16i/
2)-(min (vu, vv, vw)/2) " (wherein, i=u, v, w), finds out branch voltage instruction value vip(that is, vup、vvp、vwp),
On the other hand, by operational part 14,17,18, " (v is calculatedi/ 2)-(max (vu, vv, vw)/2) ", it finds out lower branch and is referred to voltage
Enable value vin(that is, vun、vvn、vwn)。
It applies if calculated according to modulation rate, power factor (phase difference of voltage and electric current) based on above-mentioned zero phase electricity
The neutral point potential of pressure changes the neutral point potential v in the case where inhibiting controlnVariation and graphical, then it is such to become Fig. 4.
I.e., it is known that modulation rate is lower, in operation range of power factor lower (close to phase difference=pi/2), can completely inhibit
The variation of neutral point potential.
It changes and inhibits in control in the neutral point potential based on above-mentioned zero phase voltage, due to the switch element of no upper branch
Group S1、S2、S5With the switch element group S of lower branch3、S4、S6Both the section switched, switching frequency do not increase, so
Compared with the control of the formula that only used (1), loss can be reduced.In addition, being become in Fig. 4 by applying present embodiment
Using the control of formula (1) in dynamic operation range, so neutral point potential can be inhibited in bigger operating space
Variation.In the case, neutral point potential vnVariation curve graph it is identical as Figure 11.
In this way, according to the 1st embodiment, while neutral point potential can be inhibited to change in bigger operating space,
The increase of loss is inhibited in bottom line.Furthermore it is possible to inhibit switching losses while the increase for preventing capacitor capacitance
Increase, small and inexpensive power-converting device is provided.
In addition, in the present embodiment, due to the voltage instruction value v when being superimposed zero phase voltageu、vv、vwIn median
Sign change, so the case where instantiating the variation for carrying out decision symbol using the median as object, but it is not limited to the example.Example
It such as, can also be without determining voltage instruction value vu、vv、vwMedian processing, and to the voltage instruction value v of each phaseu、vv、
vwThe variation of decision symbol respectively.In addition it is also possible to carry out the voltage instruction value of sign change by method other than the above
Determine.
In addition, the presence or absence of the variation of symbol of voltage instruction value before and after zero phase voltage of superposition can also be based on zero phase of superposition
2 voltage instruction values before and after voltage subtract each other result to determine, but it is not limited to this, and other method (examples also can be used
Such as other kinds of logic circuit) determine.
[the 2nd embodiment]
Then, the 2nd embodiment is illustrated.Hereinafter, the explanation with the common part of the 1st embodiment is omitted, with
It is illustrated centered on different parts.
The structure of the power-converting device of 2nd embodiment is same as shown in Figure 1.But the control of the 2nd embodiment fills
Set 10 and have the determination unit (not shown) different from the determination unit shown in Fig. 2 13 of the 1st embodiment, with the 1st embodiment
Different determinating references carries out the switching of control model.
The control device 10 of 2nd embodiment is carried out according to the operating condition of NPC inverter 100 from the 2nd control model
Switching (or switching from the 1st control model to the 2nd control model) to the 1st control model.Using the operating of the 1st control model
The operating condition of the 2nd control model of condition or application is for example preset using modulation rate and power factor.In addition, not
It is limited to this, active power instruction and inefficient power instruction etc. can be used also to set.Indicate that the information of operating condition is saved
Into defined storage region, in the operating of NPC inverter 100, as switching control mode determinating reference and used.
For example, having preset the 1st operating range of the 1st control model and the using such as modulation rate and power factor
The 1st control model is applied for the operating in the 1st operating range in the boundary of 2nd operating range of 2 control models, for the 2nd fortune
Turn the operating in range using the 2nd control model.
According to the 2nd embodiment, compared with the 1st embodiment, the judgement of switching control mode can be more meticulously set
Benchmark, so can make loss that the balance for changing inhibition with neutral point potential be inhibited to become more preferably, to be realized according to operational situation
Operating under control model appropriate.
[the 3rd embodiment]
Then, the 3rd embodiment is illustrated.Hereinafter, the explanation with the common part of the 1st embodiment is omitted, with
It is illustrated centered on different parts.
The structure of the power-converting device of 3rd embodiment is identical as that shown in Figure 1.But the control of the 3rd embodiment
Device 10 is also equipped with following function, it may be assumed that under the 2nd control model, according to upper branch voltage instruction value vupIt is used with lower branch
Voltage instruction value vunRespective state makes the carrier frequency variation of NPC inverter 100.
For example, control device 10 have the function of it is as follows, it may be assumed that in upper branch voltage instruction value vupWith lower branch voltage
Instruction value vunThe two be not that carrier frequency is made in the case where 0 to drop to for example common 1/2 frequency, or by upper branch
Thyristor S1、S2、S5With the thyristor S of lower branch3、S4、S6The switching frequency of element group after summarizing
Increasing makes the carrier frequency of NPC inverter 100 for example drop to common 1/2 frequency in more than a certain amount of period.
Fig. 5 is the carrier frequency for indicating the control device 10 having in the power-converting device 1 of present embodiment and having
The figure of an example of the functional structure of rate switching control.But the structural example is an example, is not limited to the example.
Carrier wave has this 2 kinds of car1 and car2, and car1 is usual carrier wave, and car2 is switched carrier.Here, suppose that car2 is for example
It is 1/2 frequency of the frequency of car1, but not limited to this.Car2 is for example also possible to 1/3 frequency of the frequency of car1.
Control device 10 has comparing section 31,32, operational part 33,34, determination unit 35,36, operational part 37, switching part
SW31、SW32。
Comparing section 31 is by upper branch voltage instruction value vupWith the comparison result or upper branch voltage of usual carrier wave car1
Instruction value vupGrid signal g with the comparison result of switched carrier car2 as upper bypass elementsupOutput.
Comparing section 32 is by lower branch voltage instruction value vunWith the usual carrier wave car1's and value " 1 " that are calculated by operational part 33
Comparison result or lower branch voltage instruction value v between differenceunWith the switched carrier car2 and value calculated by operational part 34
Grid signal g of the comparison result as lower bypass elements between the difference of " 1 "unOutput.
Determination unit 35 determines upper branch voltage instruction value vupIt whether is 0, it is defeated if not 0 if it is 0 output 1
Out 0.
Determination unit 36 determines lower branch voltage instruction value vunIt whether is 0, it is defeated if not 0 if it is 0 output 1
Out 0.
If it is determined that at least one party of the output in portion 35,36 is not 0 (that is, if upper branch voltage instruction value vupWith under
Branch voltage instruction value vunAt least one party is that 0), then operational part 37 is operated so that switching part SW31, SW32 are selected respectively
Contact 0.On the other hand, if it is decided that the output in portion 35,36 both 0 (that is, if upper branch voltage instruction value vupWith
Lower branch voltage instruction value vunIt is neither that 0), then operational part 37 is operated so that switching part SW31, SW32 are selected respectively
Select 1 contact.
In such a configuration, in upper branch voltage instruction value vupWith lower branch voltage instruction value vunAt least one party
During being 0, using usual carrier wave car1.On the other hand, in upper branch voltage instruction value vupWith lower branch voltage instruction
Value vunDuring being neither 0, application switching carrier wave car2.It is such for Fig. 6 if it indicated with waveform diagram.
If in upper branch voltage instruction value vupWith lower branch voltage instruction value vunIt is answered during being neither 0
With usual carrier wave car1, then total on-off times of upper branch and lower branch are double, but in the present embodiment, since application carries
Wave car2, so carrier frequency becomes 1/2, compared with before switching, whole on-off times do not change.I.e., it is suppressed that switch
The increase of loss.
According to the 3rd embodiment, compared with the 1st embodiment, the increase of switching losses can be further suppressed.
As described in detail above like that, according to each embodiment, neutral point potential can be inhibited in bigger operating space
Change and inhibit the increase of switching losses.
Illustrate several embodiments of the invention, but these embodiments prompt as an example, are not intended to define
The range of invention.These new embodiments can be implemented in the form of other are various, in the purport for not departing from invention
Various omissions, substitutions and changes are able to carry out in range.These embodiments and modifications thereof be included in invention range or
In purport, and it is included in the invention described in the claims and the equivalent range thereof.
Claims (6)
1. a kind of power-converting device, wherein have:
The power converter (100) of neutral point clamper type；And
Control device (10) passes through the 1st switch element group and the 2nd switch to each phase for constituting above-mentioned power converter (100)
Element group assign respectively using above-mentioned power converter (100) each phase voltage instruction value generate the 1st voltage instruction value and
2nd voltage instruction value carries out the control for inhibiting the variation of the neutral point potential of above-mentioned power converter (100),
Above-mentioned control device (10) has the mechanism for switching and implementing following control model:
1st control model is superimposed the power converter according to the voltage instruction value of each phase to above-mentioned power converter (100)
(100) voltage instruction value of new each phase obtained from zero phase voltage generates above-mentioned 1st voltage instruction value and above-mentioned 2nd electricity
Press instruction value；And
2nd control model, the voltage instruction value and its maximum value and minimum value of each phase based on above-mentioned power converter (100),
Generate above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage instruction value.
2. power-converting device as described in claim 1, wherein
Above-mentioned control device (10) is under above-mentioned 1st control model, in the voltage instruction for each phase for being superimposed above-mentioned zero phase voltage
In the case that the modulation rate of some of value is more than defined range, the switching to above-mentioned 2nd control model is carried out.
3. power-converting device as described in claim 1, wherein
Above-mentioned control device (10) according to the operating conditions of above-mentioned power converter (100), carry out above-mentioned 1st control model with it is upper
State the switching between the 2nd control model.
4. power-converting device as described in claim 1, wherein
Above-mentioned control device (10) refers under above-mentioned 2nd control model according to above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage
Order is worth respective state, makes the carrier frequency variation of above-mentioned power converter (100).
5. power-converting device as claimed in claim 4, wherein
Above-mentioned control device (10) is under above-mentioned 2nd control model, above-mentioned 1st switch element group and above-mentioned 2nd switch is first
The switching frequency of element group after part group summarizes increased in more than a certain amount of period, made the carrier wave of above-mentioned power converter (100)
Frequency decline.
6. a kind of control method of power-converting device is that there is the electric power of the power converter (100) of neutral point clamper type to become
The control method of changing device, wherein
Include the following steps: to pass through the 1st switch element group to each phase for constituting power converter (100) by control device (10)
Assign the 1st voltage generated using the voltage instruction value of each phase of above-mentioned power converter (100) respectively with the 2nd switch element group
Instruction value and the 2nd voltage instruction value carry out the control for inhibiting the variation of the neutral point potential of above-mentioned power converter (100)；
Above-mentioned control includes the steps that switching and implements the 1st control model and the 2nd control model,
Under the 1st control model, which is superimposed according to the voltage instruction value of each phase to above-mentioned power converter (100)
The voltage instruction value of new each phase obtained from zero phase voltage of device (100), generates above-mentioned 1st voltage instruction value and the above-mentioned 2nd
Voltage instruction value；And
Under the 2nd control model, the voltage instruction value and its maximum value and minimum of each phase based on above-mentioned power converter (100)
Value generates above-mentioned 1st voltage instruction value and above-mentioned 2nd voltage instruction value.
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| JP2018076721A JP7002985B2 (en) | 2018-04-12 | 2018-04-12 | Power converter and control method of power converter |
| JP2018-076721 | 2018-04-12 |
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| DE102019002715A8 (en) | 2019-12-12 |
| JP2019187135A (en) | 2019-10-24 |
| DE102019002715A1 (en) | 2019-10-17 |
| JP7002985B2 (en) | 2022-01-20 |
| CN110380636B (en) | 2021-09-14 |
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