CN110380635A - The control method of power inverter and power inverter - Google Patents
The control method of power inverter and power inverter Download PDFInfo
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- CN110380635A CN110380635A CN201910289169.6A CN201910289169A CN110380635A CN 110380635 A CN110380635 A CN 110380635A CN 201910289169 A CN201910289169 A CN 201910289169A CN 110380635 A CN110380635 A CN 110380635A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
A kind of control method of power inverter and power inverter, the power inverter of embodiment includes inverter (3) and converter (5), it is respectively provided with direct current side terminal and exchange side terminal, above-mentioned direct current side terminal is connected to shared DC link portion (4a, 4b), above-mentioned exchange side terminal is connected to shared electric system；And control device, the inefficient power exported towards above-mentioned electric system is controlled, to become the total of the inefficient power exported from above-mentioned inverter (3) via generator (1) and the inefficient power that exports from above-mentioned converter (5).
Description
The application is based on Japanese Patent application 2018-077718 (applying date: on April 13rd, 2018), and being based on should
The basic interests applied and enjoyed priority.The application whole comprising above-mentioned earlier application by referring to above-mentioned earlier application
Content.
Technical field
Embodiments of the present invention are related to the control method of power inverter and power inverter.
Background technique
There is inverter (Inverter) and converter with the power inverter mutually converted is exchanged to direct current
(Converter), it is applied in wide field in society.
Most basic inverter is 2 electrical level inverters being made of 2 thyristors.2 electrical level inverters are at 1
Bridge arm (leg) exports 2 voltage levels.
Fig. 6 be show Neutral Point Clamped (NPC (Neutral-Point-Clamped)) inverter circuit structure one
The figure of example.
As shown in fig. 6, in the presence of 1 bridge arm using 4 thyristors (hereinafter, sometimes referred to as switch element),
2 thyristors (being also possible to diode) of clamper and the Neutral Point Clamped of DC partial voltage capacitor are inverse
Become device.
NPC inverter/converter circuit of the illustrated three-phase of Fig. 6.NPC inverter can export 3 electricity in 1 bridge arm
Voltage level facilitates high voltage, reduces loss, reduces higher hamonic wave.Therefore, NPC inverter is applied to various inverse
Become device.
The structure of circuit shown in fig. 6 is illustrated.Firstly, in DC link portion, the capacitor C1 of hot side with
The capacitor C2 of low potential side is connected in series.The converter of the UVW phase of the converter 101 comprising U phase is connected in AC power source
Exchange side terminal.The exchange side terminal of the inverter of the uvw phase of the inverter 102 comprising u phase is connected in load.
Converter 101 includes the 4 switch element SW_ for being connected in series and constituting bridge arm from hot side to low potential side
C1, SW_C2, SW_C3, SW_C4；And 4 two poles of afterflow being connected in inverse parallel in a 1-to-1 manner with each switch element
Pipe D_C1, D_C2, D_C3, D_C4.
Converter 101 also include from the interlinkage of switch element SW_C1, SW_C2 to switch element SW_C3,
The interlinkage of SW_C4 and 2 switch elements SW_C5, SW_C6 being connected in series；And relative to switch element SW_
C5, SW_C6 and 2 diodes D_C5, D_C6 being connected in inverse parallel in a 1-to-1 manner.
Capacitor C1 keeps DC voltage vdc1.Capacitor C2 keeps DC voltage vdc2.In each switch element, collector
For hot side, transmitting extremely low potential side.Also, in each diode, negative side is hot side, and side of the positive electrode is low potential
Side.
In addition, exporting electric current i towards the external of converter 101 from the interlinkage of switch element SW_C2, SW_C3u c。
(current potential is interlinkage, that is, neutral point NP of the interlinkage of switch element SW_C5, SW_C6 and capacitor C1, C2
vn) connection.Flowing through in the interlinkage of the capacitor C1, C2 has electric current in c.V phase, W phase converter have with U phase turn
The same structure of the structure of parallel operation 101.
Also, the inverter 102 of u phase includes 4 for being connected in series from hot side to low potential side and constituting bridge arm and opens
Close element SW_I1, SW_I2, SW_I3, SW_I4；And 4 be connected in inverse parallel in a 1-to-1 manner with each switch element
A sustained diode _ I1, D_I2, D_I3, D_I4.
The inverter 102 of u phase is also included from the interlinkage of switch element SW_I1, SW_I2 to switch element
2 switch elements SW_I5, SW_I6 that the interlinkage of SW_I3, SW_I4 are connected in series；And relative to switch member
2 diodes D_I5, D_I6 that part SW_I5, SW_I6 are connected in inverse parallel in a 1-to-1 manner.
In addition, exporting electric current i towards the external of inverter 102 from the interlinkage of switch element SW_I2, SW_I3u i。
The interlinkage of switch element SW_I5, SW_I6 are connect with neutral point NP.Flowing through in the interlinkage has electric current in i。v
Phase, w phase inverter there is the same structure of structure with the inverter 102 of u phase.
Fig. 7 is the figure for showing an example of the circuit structure of secondary excitation converter of influence generator.
As shown in fig. 7, the secondary excitation converter of alternating current generator, that is, influence generator 111 includes inverter 112, direct current
Link portion, converter 114 and transformer 115.The DC link portion is the shared direct-current chain of inverter 112, converter 114
Road portion, and be the series circuit of hot side capacitor 113a, low potential side capacitor 113b.
Inverter 112 carries out excitation to the secondary excitation winding of influence generator 111.From the influence generator 111 towards electricity
The transformer 116 of Force system side exports inefficient power Q.Active power P required for the excitation of secondary excitation windingcFrom transformer
116 are supplied to converter 114 via the transformer 115 of secondary excitation transducer side.Converter 114 is by active power PcCourt
DC link portion supply between inverter 112 and converter 114.Electricity generation system is by such secondary excitation converter and sense
Generator 111 is answered to constitute.The electricity generation system for example uses in wind-driven generator, variable speed generator.
NPC inverter has between the DC voltage v PNpnThe capacitor divided.The neutral point NP's of NPC inverter
Current potential vnWith the movement with inverter with the property of 3 times of frequency variation of fundamental wave.If the variation of the neutral point potential
(Ripple of neutral point potential) greatly, is then applied to the variation in voltage of switch element.When voltage height
When, existing leads to the danger of element rupture because pressure resistance exceeds.When the voltage is low, exist can not export desired voltage and
A possibility that leading to toning.
The size of the variation of neutral point potential and modulation rate (Modulation index), power factor, condenser capacity,
Load current is related.Fig. 8 is to show change in NPC inverter, because of neutral point potential caused by modulation rate and power factor
The figure of an example of dynamic size.In fig. 8 it is shown that condenser capacity and load current are set as steady state value, calculate because of modulation rate
With the example of the size of the variation of neutral point potential caused by power factor.
Herein, power factor is shown as the phase difference (Phase difference) of voltage and electric current.In fig. 8, may be used
To understand, modulation rate is higher or power factor is lower, then the variation of neutral point potential is bigger.
The simplest method for inhibiting the variation of neutral point potential is to increase condenser capacity.But condenser capacity
Increase will lead to inverter volume and cost increase, energy when failure also becomes larger.
On the other hand, it about the variation of neutral point potential, can be carried out to a certain extent by the control of NPC inverter
Inhibit.By by zero phase voltage v shown in formula below (1)0With the voltage instruction value v of each phaseu、vv、vwIt is added, is able to suppress
Neutral point potential changes.
Herein, the v of formula (1)u、vv、vwIt is after being standardized with 1 relative to each phase (U phase, V phase, W phase or u phase, v phase, w
Phase) bridge arm voltage instruction value, the i of formula (1)u、iv、iwIt is the electric current exported from the bridge arm of each phase.Also, the sign table of formula (1)
Show sign function.
However, there is the operating space for being unable to fully inhibit the variation of neutral point potential by above-mentioned control.Fig. 9 is to show
The figure of an example of size in NPC inverter, having carried out the variation for changing neutral point potential when inhibiting control.Show in Fig. 9
Out with the variation that for example applies the neutral point potential in the case where control disclosed in No. 5622437 bulletin of Japanese Patent
Same calculated result.Also, the variation that Fig. 9 shows the more low then neutral point potential of power factor is bigger.When in above-mentioned Fig. 7 institute
In the case that inefficient power Q is mainly exported towards electric system in the electricity generation system shown, the power factor of inverter is low, capacitor
Neutral point potential change it is big.
Summary of the invention
Project to be solved by this invention is to provide a kind of neutral point potential for being able to suppress inverter and changes, prevents electricity
The increased power inverter of container capacity and the control method of power inverter.
The power inverter of embodiment includes inverter and converter, is respectively provided with direct current side terminal and friendship
Side terminal is flowed, above-mentioned direct current side terminal is connected to shared DC link portion, and above-mentioned exchange side terminal is connected to altogether
Electric system；And control device, the inefficient power exported towards above-mentioned electric system is controlled, with become from
The inefficient power that above-mentioned inverter is exported via generator adds up to the inefficient power from the output of above-mentioned converter.
In accordance with the invention it is possible to which the neutral point potential of inverter is inhibited to change, prevent the increase of condenser capacity.
Detailed description of the invention
Fig. 1 be show power inverter involved in first embodiment the figure of the configuration example of system applied.
Fig. 2 is the block diagram for showing an example of the control circuit of inefficient power instruction value involved in first embodiment.
Fig. 3 is the figure for showing an example of output area of the electric current from converter.
Fig. 4 be show power inverter involved in second embodiment the figure of the configuration example of system applied.
Fig. 5 be show power inverter involved in third embodiment the figure of the configuration example of system applied.
Fig. 6 is the figure for showing an example of circuit structure of Neutral Point Clamped inverter.
Fig. 7 is the figure for showing an example of the circuit structure of secondary excitation converter of influence generator.
Fig. 8 be show it is in NPC inverter, because caused by modulation rate and power factor the variation of neutral point potential it is big
The figure of small an example.
Fig. 9 is to show size in NPC inverter, having carried out the variation for changing neutral point potential when inhibiting control
The figure of an example.
Specific embodiment
Hereinafter, being illustrated using attached drawing to embodiment.
(first embodiment)
Fig. 1 be show power inverter involved in first embodiment the figure of the configuration example of system applied.
In addition, hereinafter, constituent element about the constituent element with power inverter shown in FIG. 1 identically or comparably, mark with
The identical appended drawing reference of appended drawing reference used in Fig. 1 and be illustrated.
In Fig. 1, variable-ratio pump up water electricity generation system (hereinafter referred to as electricity generation system) three-phase induction generator (hereinafter referred to as
Influence generator) 1 secondary excitation converter include NPC inverter (hereinafter referred to as inverter) 3, NPC converter (hereinafter referred to as
Converter) 5 and transformer (Transformer) 6.Electric power is constituted using the secondary excitation converter and control device 10 to turn
Changing device.Electricity generation system is constituted using the power inverter and influence generator 1.The hair that pumps up water is connected in influence generator 1
The hydraulic turbine 2 of electricity.
The exchange side terminal of inverter 3 is connected to the secondary excitation winding of influence generator 1.The exchange side of converter 5
Son is connected to electric system via transformer 6.Inverter 3 and converter 5 are respectively provided with direct current side terminal and exchange side
Son.The direct current side terminal of inverter 3 and converter 5 is connected to the portion shared DC link (link).The DC link portion is
The shared DC link portion of inverter 3 and converter 5 is the capacitor 4b of the capacitor 4a of hot side, low potential side
Series circuit.The exchange side terminal of inverter 3 is connected to shared electric system with the side terminal that exchanges of converter 5.It is inverse
Become exchanging side terminal and capable of being also connected to respectively via influence generator 1, transformer 6 for exchange side terminal and the converter 5 of device 3
Shared electric system.
Inverter 3 encourages the influence generator 1 and the secondary excitation winding to influence generator 1 supplies electric power
Magnetic.The stator winding of influence generator 1 is connected to electric system via transformer 7.
When influence generator 1 exports active power towards electric system, inverter 3 is also exported effectively towards influence generator 1
Electric power.When influence generator 1 exports inefficient power towards electric system, inverter 3 exports inefficient power towards influence generator 1.
Converter 5 obtains inversion via the transformer 7 of electric system side, the transformer 6 of transducer side from electric system
Active power P required for the operating of device 3c, and by active power PcTowards the DC link portion between converter 5 and inverter 3
Supply.
The case where exporting inefficient power Q towards electric system to electricity generation system is illustrated.In the first embodiment, incude
Generator 1 exports inefficient power Q towards electric systemg, converter 5 is by inefficient power QcIt is directly defeated towards electric system via transformer 6
Out, electricity generation system exports inefficient power Q towards electric system.Herein, directly exporting towards electric system means not via induction
Generator 1 and exported.I.e., formula (2) below is set up.
Q=Qg+Qc... formula (2)
Herein, QgUpper target g indicate influence generator 1, QcSubscript c indicate converter 5.Herein, influence generator 1
Power generation end active power be arbitrary, omit record.
The effect of converter 5 is to maintain DC voltage, if but appearance extra involved in output of the converter 5 with electric power
Amount, then the converter 5 can export inefficient power.
Fig. 2 is the block diagram for showing an example of the control circuit of inefficient power instruction value involved in first embodiment.
As shown in Fig. 2, control device 10 assigns the inefficient power instruction value Q for being directed to converter 5C*.Herein, to for sense
Answer the inefficient power instruction value Q of generator 1G*Operation be further illustrated.
Fig. 3 is the figure for showing an example of output area of the electric current from converter 5.
As shown in figure 3, the range that converter 5 is capable of output power can be by having used d axis and q axis (orthogonal with d axis
Axis) rotating coordinate system indicate.The output electric current I of converter 5cIt is output electricity corresponding with the circle being represented by dashed line in Fig. 3
Flow maximum value Imax cRange.As the effective current I needed to maintain DC voltaged cThe vector on d axis as shown in Figure 3
When expression, the idle current I that can exportq cBy the vector I parallel with q axis in Fig. 3q cIt indicates.Based on the relationship, Neng Goutong
It crosses formula below (3) and obtains the idle current instruction value I for being directed to converter 5q C*。
Herein, based on the effective current instruction value I for being directed to converter 5d C*, for the idle current instruction value of converter 5
Iq C*, for the effective voltage instruction value V of converter 5d C*And the dead voltage instruction value V for converter 5q C*, for turn
The inefficient power instruction value Q of parallel operation 5C*It can be obtained by formula below (4).
QC*=Vq C*Id C*- Vd C*Iq C*... formula (4)
Inefficient power instruction value QC*No more than the inefficient power instruction value Q for being directed to electricity generation system*, i.e. from induction send out
Total finger of inefficient power and the inefficient power exported from converter 5 towards electric system that motor 1 is exported towards electric system
Enable value.Therefore, limiter 18 is by inefficient power instruction value QC*It is limited in-Q*~Q*Range.
Herein, for the inefficient power instruction value Q of influence generator 1G*It can be set to from for the invalid of electricity generation system
Power command value Q*Subtract the inefficient power instruction value Q for converter 5C*Obtained from be worth.Thus, formula (5) below at
It is vertical.I.e., in the first embodiment, the inefficient power instruction value that power inverter will be exported from electricity generation system towards electric system
Total output as inefficient power instruction value and the inefficient power instruction value for influence generator 1 for converter 5.
The control device 10 of power inverter controls the inefficient power instruction value exported from electricity generation system towards electric system, with
Become the total of the inefficient power instruction value for converter 5 and the inefficient power instruction value for influence generator 1.
QG*=Q*- QC*... formula (5)
In this way, control device 10 will be by that will be directed to the inefficient power instruction value Q of influence generator 1G*It is assigned via inverter 3
It gives to influence generator 1, the inefficient power instruction value Q of converter 5 will be directed toC*It is given to converter 5, output is for power generation system
The inefficient power instruction value Q of system*。
As shown in Fig. 2, control device 10 as computing circuit have arithmetic unit 11,12, subtracter 13, arithmetic unit 14, multiply
Musical instruments used in a Buddhist or Taoist mass 15,16, subtracter 17, limiter 18 and subtracter 19.The computing circuit for example can be by comprising executing program
CPU(Central Processing Unit)、RAM(Random Access Memory)、ROM(Read Only Memory)
The computer installation of equal storage devices is realized.
Secondly, being illustrated to the concrete example of the output for the inefficient power instruction value for having used the computing circuit.
The output current maxima I of 11 output translator 5 of arithmetic unitmax cSquare.The output of arithmetic unit 12 is directed to converter 5
Effective current instruction value Id C*Square.Export current maxima Imax cIt is the arbitrary value in design.
The output of subtracter 13 is obtained by subtracting from the output valve from arithmetic unit 11 from the output valve of arithmetic unit 12
Deviation.Arithmetic unit 14 is using the square root of the deviation from subtracter 13 as the idle current instruction value I for being directed to converter 5q C*
Output.
Used above-mentioned arithmetic unit 11,12, the operation of subtracter 13 and arithmetic unit 14 with based on above-mentioned formula (3)
Operation it is corresponding.
Multiplier 15 is exported by the idle current instruction value I for converter 5 from arithmetic unit 14q C*Multiplied by needle
To the effective voltage instruction value V of converter 5d C*Obtained from be worth.The output of multiplier 16 passes through to the effective electricity for being directed to converter 5
Flow instruction value Id C*Multiplied by the dead voltage instruction value V for being directed to converter 5q C*Obtained from be worth.
Subtracter 17 exports the deviation as obtained from from the output valve that the output valve of multiplier 16 subtracts multiplier 15.Make
With above-mentioned multiplier 15,16, the operation of subtracter 17 it is corresponding with based on the above-mentioned operation of formula (4).
Limiter 18 by by the deviation from subtracter 17 in-Q*~Q*Range limited obtained from value
As the inefficient power instruction value Q for being directed to converter 5C*Output.
Subtracter 19 find out by from be directed to electricity generation system inefficient power instruction value Q*Subtract the needle from limiter 18
To the inefficient power instruction value Q of converter 5C*Obtained from deviation, and using the deviation as invalid for influence generator 1
Power command value QG*Output.Use the operation of the subtracter 19 corresponding with based on the above-mentioned operation of formula (5).
Herein, conventional example is illustrated.In the prior embodiment, shown in Fig. 7 as described above, inefficient power Q only from
Influence generator 111 is exported towards electric system.I.e., formula (6) below is set up.
Q=Qg... formula (6)
Converter 114 shown in Fig. 7 is by active power PcIt is supplied towards DC link portion.On the other hand, inefficient power QcNot
It is exported from converter 114.I.e., for the inefficient power instruction value Q of influence generator 111G*It is indicated by formula below (7), needle
To the inefficient power instruction value Q of converter 114C*It is indicated by formula below (8).
QG*=Q*... formula (7)
QC*=0 ... formula (8)
As described above, the neutral point potential about NPC inverter changes, the power factor the low then, and it is bigger.In this implementation
In mode, when influence generator 1 exports inefficient power towards electric system, inverter 3 also exports inefficient power.
Return to description of the present embodiment.In the present embodiment, the invalid electricity that influence generator 1 is exported towards electric system
Power QgFor (a) below or (b) (referring to formula (5)).
(a) by subtracting from the inefficient power output valve Q of the actual output valve as electricity generation system from converter 5 towards electricity
The inefficient power output valve Q of Force system outputcObtained from electric power
(b) by from be directed to electricity generation system inefficient power instruction value Q*Subtract the inefficient power instruction value towards converter 5
QC*Obtained from electric power.
Thus, the power factor of inverter 3 improves.As a result, it is possible to which the neutral point potential for reducing NPC inverter changes.
According to the present embodiment, in NPC inverter/converter, the neutral point potential for being able to suppress NPC inverter becomes
Move, prevent the increase of condenser capacity.As a result, it is possible to realize small-sized, inexpensive and safe power inverter.
Hereinafter, common item of the narration comprising each embodiment including first embodiment.
NPC converter is also possible to T-type NPC converter.Also, in the operation in the computing circuit of control device 10,
Instead of the effective voltage instruction value V for being directed to converter 5d C*With the dead voltage instruction value V for being directed to converter 5q C*, can also make
With the effective voltage output valve V of converter 5d cWith the dead voltage output valve V of converter 5q c。
Also, in the operation in the computing circuit of control device 10, instead of the effective current instruction value for being directed to converter 5
Id C*, the effective current output valve I of converter 5 also can be usedd c。
(second embodiment)
Fig. 4 be show power inverter involved in second embodiment the figure of the configuration example of system applied.
Power inverter involved in present embodiment the basic structure and first embodiment of system applied
It is identical.However, windmill 30 rotates influence generator 1 instead of the hydraulic turbine 2 of first embodiment.That is, 1 quilt of influence generator
It is used as wind-driven generator.
In the present embodiment, the secondary excitation converter of the wind-driven generator of induction type is by same as first embodiment
NPC inverter/converter constitute, the output of inefficient power carries out in a manner of same as first embodiment.Induction power generation
The inefficient power Q that machine 1 is exported towards electric systemgFor (c) below or (d) (referring to formula (5)).
(c) it is subtracted by the actual output valve Q of inefficient power output valve from the actual output valve as electricity generation system
The inefficient power output valve Q exported from converter 5 towards electric systemcObtained from electric power
(d) by from be directed to electricity generation system inefficient power instruction value Q*Subtract the inefficient power instruction value towards converter 5
QC*Obtained from electric power
Thus, the power factor of inverter 3 improves.As a result, it is possible to which the neutral point potential for reducing NPC inverter changes.
According to the present embodiment, same as first embodiment, in NPC inverter/converter, it is inverse to be able to suppress NPC
Become the neutral point potential variation of device, prevent the increase of condenser capacity.As a result, it is possible to realize small-sized, inexpensive and safe electricity
Power conversion device.
(third embodiment)
Fig. 5 be show power inverter involved in third embodiment the figure of the configuration example of system applied.
In the present embodiment, and the not set influence generator 1 illustrated in the first embodiment.About this implementation
Power inverter involved in mode the system applied, such as can be applied to electric system voltage compensating device or
Person's trend (direction of energy) controller.In the third embodiment, instead of illustrate in the first embodiment transformer 6,
7, the shunt transformer 41 of transducer side and the series transformer 42 of electric system side is respectively set.The exchange side of inverter 3
Son is connected to electric system via series transformer 42, and the exchange side terminal of converter 5 is connected to electricity via shunt transformer 41
Force system, DC link portion are that inverter 3 and converter 5 share.
In general, inverter 3 exports the voltage of offset voltage or load disturbance towards electric system, converter 5 is from electric power
System only obtains active power required for the movement of inverter 3.In the present embodiment, towards the inefficient power of electric system with
Mode same as first embodiment exports.But illustrate in the first embodiment, it is for influence generator 1
Inefficient power instruction value, as the inefficient power instruction value Q for being directed to inverterI*It is exported towards electric system.
The inefficient power Q exported from inverter 3iFor (e) below or (f).
(e) by subtracting from the inefficient power output valve Q of the actual output valve as electricity generation system from converter 5 towards electricity
The inefficient power output valve Q of Force system outputcObtained from electric power
(f) by from be directed to electricity generation system inefficient power instruction value Q*Subtract the inefficient power instruction value towards converter 5
QC*Obtained from electric power
Thus, the power factor of inverter 3 improves, and can reduce neutral point potential variation.
According to the present embodiment, same as first embodiment, in NPC inverter/converter, it is inverse to be able to suppress NPC
Become the neutral point potential variation of device, prevent the increase of condenser capacity.As a result, it is possible to realize small-sized, inexpensive and safe electricity
Power conversion device.
Several embodiments of the invention are described, but above embodiment is only mentioned as an example
Show, is not intended to limit the range of invention.Above-mentioned new embodiment can be implemented in a variety of other ways, Neng Gou
The range for not departing from the purport of invention carries out various omissions, displacement, change.Above embodiment and its deformation are contained in invention
In range or purport, and it is contained in the invention and its equivalent range recorded in technical solution.
Claims (7)
1. a kind of power inverter, has:
Inverter (3) and converter (5) are respectively provided with direct current side terminal and exchange side terminal, above-mentioned direct current side terminal point
It is not connected to shared DC link portion (4a, 4b), above-mentioned exchange side terminal is connected to shared electric system；And
Control device (10) controls the inefficient power exported towards above-mentioned electric system, to become from above-mentioned inversion
The inefficient power that device (3) is exported via generator (1) adds up to the inefficient power from above-mentioned converter (5) output.
2. power inverter according to claim 1, wherein
Above-mentioned control device (10),
The output voltage of output electric current and above-mentioned converter (5) based on above-mentioned converter (5), operation are directed to above-mentioned converter
(5) inefficient power instruction value,
It is controlled, so that the inefficient power that is exported from above-mentioned generator (1) towards above-mentioned electric system and from above-mentioned conversion
The total instruction value for the inefficient power that device (5) is exported towards above-mentioned electric system, with it is above-mentioned calculate for above-mentioned converter
(5) deviation of inefficient power instruction value is exported as the inefficient power instruction value for above-mentioned generator (1).
3. a kind of power inverter, has:
Inverter (3) and converter (5), direct current side terminal are connected to shared DC link portion (4a, 4b), exchange side
Terminal is connected to shared electric system；And
Control device (10), controls towards the inefficient power that electric system exports, to become from above-mentioned inverter (3)
The inefficient power of output is total with the inefficient power from above-mentioned converter (5) output.
4. power inverter according to claim 2, wherein
Above-mentioned converter (5),
Will with by above-mentioned control device (10) calculate for the above-mentioned inefficient power instruction value of above-mentioned converter (5) it is corresponding
Inefficient power exports in the range of output power capacity towards above-mentioned electric system.
5. power inverter according to claim 2, wherein
Above-mentioned control device (10),
The maximum value of above-mentioned output electric current based on above-mentioned converter (5) and the effective current for being directed to above-mentioned converter (5) instruct
Value, operation are directed to the idle current instruction value of above-mentioned converter (5),
Above-mentioned output voltage based on above-mentioned idle current instruction value and above-mentioned converter (5), operation are directed to above-mentioned converter
(5) inefficient power instruction value.
6. according to claim 1, power inverter described in any one of 2,4,5, wherein
The secondary excitation winding for the above-mentioned generator (1) that above-mentioned inverter (3) connect towards stator winding with above-mentioned electric system supplies
To electric power.
7. a kind of control method of power inverter is the method controlled power inverter,
Above-mentioned power inverter has inverter (3) and converter (5), and above-mentioned inverter (3) and converter (5) are respectively
It is connected to shared DC link portion (4a, 4b) with direct current side terminal and exchange side terminal, above-mentioned direct current side terminal,
Above-mentioned exchange side terminal is connected to shared electric system,
In the control method of above-mentioned power inverter,
The inefficient power exported towards above-mentioned electric system is controlled, to become from above-mentioned inverter (3) via power generation
The inefficient power of machine (1) output is total with the inefficient power from above-mentioned converter (5) output.
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| JP2018-077718 | 2018-04-13 | ||
| JP2018077718A JP7005417B2 (en) | 2018-04-13 | 2018-04-13 | Power converter and control method of power converter |
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| JP2019187156A (en) | 2019-10-24 |
| JP7005417B2 (en) | 2022-01-21 |
| DE102019002713A1 (en) | 2019-10-17 |
| CN110380635B (en) | 2021-08-03 |
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