CN109802587B - Three level NPC converter system of modularization and control method based on coupling inductance - Google Patents
Three level NPC converter system of modularization and control method based on coupling inductance Download PDFInfo
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Abstract
The invention proposes a kind of three level NPC converter system of modularization and control method based on coupling inductance, including at least two three-level converters, the three-level converter includes three-phase bridge arm in parallel, every phase bridge arm includes four concatenated IGBT pipes, and each phase bridge arm carries out clamper to direct current midpoint capacitor using diode；The bridge arm midpoint of the DC side parallel of every two three-level converter, the exchange each phase in side is in parallel by coupling inductance different name end, forms a submodule, and each submodule is connected by outputting inductance with AC load.The invention has the advantages that: the power qualities that total output electric current under low switching frequency is improved by improved phase-shifting carrier wave；By the way that dead beat circulation controller is added, the circulation between converter is reduced.
Description
Technical field
The present invention relates to a kind of three level NPC converter system of modularization and control method based on coupling inductance.
Background technique
Only there is provided background technical informations related to the present invention for the statement of this part, it is not necessary to so constitute first skill
Art.
In recent years, three-level converter is using more and more extensive.Compared with two level converters, three-level converter makes device
Part bears lesser switch stress, and can substantially improve output waveform.In typical three-level converter topological structure, two
Pole pipe clamper type three-level converter is widely used.Due to the limitation of switching tube current stress, separate unit converter
Capacity is limited, has been unable to satisfy the requirement of high-power applications occasion.For high-power applications occasion such as air-conditioning system, underground railway track
Traffic, distributed generation system etc., converter parallel connection will become the mainstream situation of energy conversion.
However, in high-power applications, select lower switching frequency usually to reduce the loss of changer system, and it is normal
The reduction of switching frequency can equally cause the decline for exporting electric current power quality in the parallel way of rule；Meanwhile it is hard between module
Part mismatches, dead time and control algolithm execute the difference such as time and can generate circulation.Circulation will increase system loss and draw
Grid-connected current distortion is played, the service life of IGBT switching tube is seriously affected.
Summary of the invention
The invention proposes a kind of three level NPC converter system of modularization and control method based on coupling inductance, can
To realize the loop current suppression under high-power more converter parallel systems, hence it is evident that improve the output electric current under low switching frequency operating condition
Power quality.
According to some embodiments, the present invention adopts the following technical scheme:
A kind of three level NPC converter system of modularization based on coupling inductance, including at least two three-level converters,
The three-level converter includes three-phase bridge arm in parallel, and every phase bridge arm includes four concatenated IGBT pipes, and each phase bridge arm uses
Diode carries out clamper to direct current midpoint capacitor；
The bridge arm midpoint of the DC side parallel of every two three-level converter, the exchange each phase in side passes through coupling inductance different name
End is in parallel, forms a submodule, and each submodule is connected by outputting inductance with AC load.
Further, multiple submodule is parallel with one another realizes expansion in parallel.
Further, further include control circuit, the control circuit include: sequentially connected conditioning circuit, sample circuit,
Controller and driving circuit, controller is also with protection circuit connection, IGBT in driving circuit output pwm signal driving bridge arm
Pipe being opened and turning off.
Further, protection circuit realizes the over-voltage over-current protection of changer system；Conditioning circuit surveys Hall sensor
The coherent signal obtained is improved, and the analog signal that sample circuit can receive is obtained；Sample circuit believes conditioned simulation
Number being converted to digital quantity sends controller to；Controller is used to generate the driving signal of control system normal operation.
According to other embodiment, the present invention adopts the following technical scheme:
A kind of control method of the three level NPC converter system of modularization based on coupling inductance, comprising: each submodule
Three-level converter the triangular carrier cycle it is identical, and mutual deviation 180 degree；First of all submodules in n sub- intermodules
Triangular carrier mutual deviation 180/n degree between three-level converter.
Further, the circulation three-level converter is controlled using based on dead beat circulation controller, is being adjusted
First three-level converter zero sequence tune in current three-level converter and first submodule of changer system is added in wave processed
The difference of wave processed and the output valve of track with zero error device control circulation.
Compared with prior art, the beneficial effects of the present invention are:
1, the power quality of total output electric current under low switching frequency is improved by improved phase-shifting carrier wave；
2, by the way that dead beat circulation controller is added, the circulation between converter is reduced；
3, it can reduce wave filter on AC side design capacity, save converter parallel system cost；
4, it is still applicable in the case where inconsistent for transducer parameters, operating condition；
5, method is realized simple, strong to the expansion of parallel system, practical using simple.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is three-level converter parallel system structure chart in embodiment one；
Fig. 2 is the electric operation control circuit figure of parallel connection three-level converter in embodiment one；
Fig. 3 is the carrier waveform of three-level converter parallel system in embodiment two；
Fig. 4 is control system controller block diagram in embodiment two；
Fig. 5 (a)-(b) be respectively in embodiment two in parallel three-level converter using the grid-connected of conventional carrier synchronous modulation
Current waveform and THD；
Fig. 6 (a)-(b) be in embodiment two in parallel three-level converter using carrier interleaving grid-connected current waveform and
THD；
Fig. 7 is that parallel connection three-level converter does not control circulation and track with zero error device circulation waveform in embodiment two.
Specific embodiment
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms that the present invention uses have logical with the application person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Embodiment one
A kind of three level NPC current transformer system of modularization based on coupling inductance is proposed in one or more embodiments
System, as shown in Figure 1, including at least two three-level converters, three-level converter includes three-phase bridge arm in parallel, every phase bridge arm
Including four concatenated IGBT pipes, each phase bridge arm carries out clamper to direct current midpoint capacitor using diode；
The bridge arm midpoint of the DC side parallel of every two three-level converter, the exchange each phase in side passes through coupling inductance different name
End is in parallel, forms a submodule, and each submodule is connected by outputting inductance with AC load, system output and power grid phase
Even.
Multiple submodule is parallel with one another to realize expansion in parallel.
It is illustrated in figure 2 the electric operation control circuit figure of three-level converter.Control circuit includes protection circuit, driving circuit, adopts
Sample circuit, conditioning circuit, conditioning circuit are connect with sample circuit, and sample circuit connects DSP module, DSP module and protection circuit
Two-way communication, DSP module connect driving circuit, and IGBT pipe opening and turning off in driving circuit output pwm signal driving bridge arm.
Conditioning circuit acquires the three-phase current i of upper and lower capacitance voltage value VP, VN of DC side and filter outputa、ib、
ic, filter is divided into coupling inductance in module and outputting inductance two parts.
Signal conditioning circuit and control voltage had/under-voltage protection and overcurrent protection；Conditioning circuit is by Hall sensor
The coherent signal measured is improved, and the analog signal that sample circuit can receive is obtained.
Coherent signal (VP, VN, i that conditioning circuit measures Hall sensora、ib、icMeasured value) improved, obtain
The analog signal that can receive to sample circuit.The sampling of converter is controlled with conversion by DSP, by conditioned simulation
Signal is converted to digital quantity.The processing of digital signal and SPWM control, PWM are generated and are realized by DSP, the PWM ultimately generated
Signal gives driving circuit and goes opening and turning off for control IGBT pipe.
Embodiment two
Based on the three level NPC converter system of modularization based on coupling inductance in embodiment one, a kind of control is proposed
Method realizes the control to three-level converter in parallel based on carrier interleaving method and indifference shooting method.The present embodiment method pair
It is applicable in carrier wave with phase and carrier wave inversion method, is specifically explained so that carrier wave is with the carrier interleaving method of phase as an example below
It states.
Fig. 3 is the carrier waveform of three-level converter parallel system, mentions High Output Current using the method for phase-shifting carrier wave
Power quality: the triangular carrier cycle of two converters between each submodule is identical, and mutual deviation 180 degree；In n sub- intermodules
Triangular carrier mutual deviation 180/n degree between the First converter of all submodules.
Fig. 4 is control system control block diagram, is controlled using based on dead beat circulation controller circulation converter,
The input of track with zero error device is equivalent inductance, electric current, the parameters such as resistance.Current Transform is mainly added in controller in modulating wave
The difference and nothing of First three-level converter zero sequence modulating wave in first submodule of zero sequence modulating wave changer system of device
The output valve of beat control device controls circulation.
Abc three-phase current obtains i by coordinate transformd, iqAnd iz。idAnd iqThree-phase modulations wave is obtained by PI controller.
izIt is controlled using dead beat circulation controller, the input of track with zero error device is equivalent inductance, electric current, the parameters such as resistance.Control
Device processed is mainly the difference of zero sequence modulating wave and First converter zero sequence modulating wave that current variator is added in modulating wave
And the output valve of track with zero error device controls circulation.
Wherein track with zero error device needs two transducer loop stream information i of module 1z1With iz2, parameter with coupling inductance
Self-induction Lsub1, mutual inductance Msub1, the parameter Lg of outputting inductancesub1, and two transducer informations of module k for needing to control
iz(2k-1)、iz(2k)、Lsubk、Msubk、Lgsubk.The dead beat of two converters ((2k-1) and (2k) platform converter) of module k
The output madd (2k-1) of the sum of controller and zero sequence modulating wave difference, the form of madd (2k) are as follows:
Wherein:ma、mb、mcFor the value of three-phase modulations wave, UdcFor the electricity of DC bus
Pressure value, MsubkFor the mutual inductance value of k-th of submodule coupling inductance of changer system, LsubkFor k-th of submodule coupling of changer system
Inductance is from inductance value, LgsubkFor changer system k-th submodule outputting inductance value, mz(2k-1)For k-th of submodule of changer system
Zero sequence modulating wave, the m of block First converterz1First converter zero sequence modulating wave in first submodule of changer system.
Fig. 5 (a)-(b) is the current waveform and THD that three-level converter in parallel uses conventional carrier synchronous modulation, wherein
Switching frequency is 2.5kHz.It can be seen that it is serious using the distortion of conventional method output waveform, it is superimposed with 5kHz component.
Fig. 6 (a)-(b) is the current waveform that present invention three-level converter in parallel is modulated using carrier interleaving of the invention
And THD.Current waveform distortion disappears.
Fig. 7 is present invention three-level converter in parallel in the different situation of operating condition, does not control circulation and dead beat control
Device circulation waveform processed.As can be seen that circulation is significantly suppressed from waveform.
Wave filter on AC side design capacity can reduce using the present embodiment method, save converter parallel system cost；
It is still applicable in the case that this method is inconsistent for transducer parameters, operating condition；This method is realized simply, is opened up to parallel system
Malleability is strong, practical using simple；In rail traffic absorption plant, photovoltaic generating system, wind generator system, fuel electricity
The field of renewable energy such as pond have a extensive future.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (5)
1. a kind of three level NPC converter system of modularization based on coupling inductance, which is characterized in that including at least two 3 electricity
Flat converter, the three-level converter include three-phase bridge arm in parallel, and every phase bridge arm includes four concatenated IGBT pipes, each phase
Bridge arm carries out clamper to direct current midpoint capacitor using diode；
The bridge arm midpoint of the DC side parallel of every two three-level converter, the exchange each phase in side passes through coupling inductance different name end simultaneously
Connection, forms a submodule, and each submodule is connected by outputting inductance with AC load；
The circulation three-level converter is controlled using based on dead beat circulation controller, is added in modulating wave current
The difference and nothing of First three-level converter zero sequence modulating wave in three-level converter and first submodule of changer system
The output valve of beat control device controls circulation；
Abc three-phase current obtains i by coordinate transformd, iqAnd iz, idAnd iqThree-phase modulations wave, i are obtained by PI controllerzMake
It is controlled with dead beat circulation controller, the input of track with zero error device is equivalent inductance, electric current, the parameters such as resistance；
Wherein track with zero error device needs two transducer loop stream information i of module 1z1With iz2, parameter self-induction with coupling inductance
Lsub1, mutual inductance Msub1, the parameter Lg of outputting inductancesub1, and the two transducer information i of module k for needing to controlz(2k-1)、
iz(2k)、Lsubk、Msubk、Lgsubk, the track with zero error device of two converters ((2k-1) and (2k) platform converter) of module k and
The output madd (2k-1) of the sum of zero sequence modulating wave difference, the form of madd (2k) are as follows:
Wherein:ma、mb、mcFor the value of three-phase modulations wave, UdcFor DC bus voltage value,
MsubkFor the mutual inductance value of k-th of submodule coupling inductance of changer system, LsubkFor k-th of submodule coupling inductance of changer system
From inductance value, LgsubkFor changer system k-th submodule outputting inductance value, mz(2k-1)For k-th of submodule of changer system
Zero sequence modulating wave, the m of one converterz1First converter zero sequence modulating wave in first submodule of changer system.
2. a kind of three level NPC converter system of modularization based on coupling inductance as described in claim 1, feature exist
In multiple submodule is parallel with one another to realize expansion in parallel.
3. a kind of three level NPC converter system of modularization based on coupling inductance as described in claim 1, feature exist
In, further include control circuit, the control circuit include: sequentially connected conditioning circuit, sample circuit, controller and driving electricity
Road, controller is also with protection circuit connection, and IGBT pipe opening and closing in driving circuit output pwm signal driving bridge arm
It is disconnected.
4. a kind of three level NPC converter system of modularization based on coupling inductance as claimed in claim 3, feature exist
In protection circuit realizes the over-voltage over-current protection of changer system；The coherent signal that conditioning circuit measures Hall sensor into
Row conditioning, obtains the analog signal that sample circuit can receive；Conditioned analog signal is converted to digital quantity by sample circuit
Send controller to；Controller is used to generate the driving signal of control system normal operation.
5. a kind of control method of the three level NPC converter system of modularization based on coupling inductance characterized by comprising
The triangular carrier cycle of the three-level converter of each submodule is identical, and mutual deviation 180 degree；All submodules in n sub- intermodules
Triangular carrier mutual deviation 180/n degree between first three-level converter of block；
The circulation three-level converter is controlled using based on dead beat circulation controller, is added in modulating wave current
The difference and nothing of First three-level converter zero sequence modulating wave in three-level converter and first submodule of changer system
The output valve of beat control device controls circulation；
Abc three-phase current obtains i by coordinate transformd, iqAnd iz, idAnd iqThree-phase modulations wave, i are obtained by PI controllerzMake
It is controlled with dead beat circulation controller, the input of track with zero error device is equivalent inductance, electric current, the parameters such as resistance；
Wherein track with zero error device needs two transducer loop stream information i of module 1z1With iz2, parameter self-induction with coupling inductance
Lsub1, mutual inductance Msub1, the parameter Lg of outputting inductancesub1, and the two transducer information i of module k for needing to controlz(2k-1)、
iz(2k)、Lsubk、Msubk、Lgsubk, the track with zero error device of two converters ((2k-1) and (2k) platform converter) of module k and
The output madd (2k-1) of the sum of zero sequence modulating wave difference, the form of madd (2k) are as follows:
Wherein:ma、mb、mcFor the value of three-phase modulations wave, UdcFor DC bus voltage value,
MsubkFor the mutual inductance value of k-th of submodule coupling inductance of changer system, LsubkFor k-th of submodule coupling inductance of changer system
From inductance value, LgsubkFor changer system k-th submodule outputting inductance value, mz(2k-1)For k-th of submodule of changer system
Zero sequence modulating wave, the m of one converterz1First converter zero sequence modulating wave in first submodule of changer system.
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| CN103368427A (en) * | 2012-04-05 | 2013-10-23 | 艾默生网络能源有限公司 | Single-phase inverter and system thereof and three-phase inverter and system thereof |
| CN104935197B (en) * | 2014-03-19 | 2017-11-24 | 华为技术有限公司 | A kind of multi-level converter and electric power system |
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Application publication date: 20190524 Assignee: SHANDONG TAIKAI POWER ELECTRONIC Co.,Ltd. Assignor: SHANDONG University Contract record no.: X2022980013010 Denomination of invention: Modular three-level NPC converter system and control method based on coupled inductor Granted publication date: 20191018 License type: Common License Record date: 20220822 |