CN106026737B - A kind of three-level current transformer compound circulation inhibition method in parallel - Google Patents
A kind of three-level current transformer compound circulation inhibition method in parallel Download PDFInfo
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- CN106026737B CN106026737B CN201610495576.9A CN201610495576A CN106026737B CN 106026737 B CN106026737 B CN 106026737B CN 201610495576 A CN201610495576 A CN 201610495576A CN 106026737 B CN106026737 B CN 106026737B
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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
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M7/493—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 the static converters being arranged for operation in parallel
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of three-level current transformer for being controlled based on mean power and optimizing SVPWM modulation compound circulation inhibition method in parallel, can solve the zero sequence circulation problem in three-phase tri-level parallel system.Described compound circulation inhibition method includes the compound circulation inhibition method for the SVPWM modulation for controlling and optimizing based on mean power, and it controls the size of current transformer output voltage in control process by the method for power-sharing；A regulatory factor is introduced in modulated process to adjust small vector action time, so that the zero sequence dutycycle of current transformer is zero, it is combined by the control and modulator approach of optimization, reach the purpose for suppressing three-level current transformer circulation in parallel, so as to reduce system output harmonic wave, power attenuation is reduced, the stability that energy utilization rate and parallel system are incorporated into the power networks is improved, there is good feasibility and practical value.
Description
Technical field
The present invention relates to a kind of three-level current transformer parallel connection complex loop for being controlled based on mean power and optimizing SVPWM modulation
Flow suppressing method.
Background technology
In recent years, with restriction getting worse of the energy and environment problem to human social development, the exploitation of new energy and
The protection of environment has been to be concerned by more and more people.It is rapid with new energy energy storage, power network energy storage, electric automobile and micro-capacitance sensor
Development, extensive energy storage technology have stronger application demand in power system Generation Side, grid side, user side.
Due to the limitation of the power switch pipe internal pressure grade of traditional two-level inverter, high-power can not be met
Requirement.In high voltage applications occasion, generally requiring power device to connect uses, and this needs extra equalizer circuit, led again
Cause system realizes the increase of difficulty.
In this case, the appearance of multilevel converter provides one for the development of high-voltage large-capacity voltage source converter topology
The new thinking of bar.And three-level inverter is that number of switches is minimum in multi-level inverter circuit, transported in multi-electrical level inverter
With the most extensive.The advantages of three-level topology, has：1. switching loss is small, efficiency high；2. voltage change ratio is small during switch motion, draw
The electromagnetic interference risen is small；3. harmonic content is few, required filtering inductance is small, beneficial to reduction system cost.As can be seen here, three electricity
Flat topological structure has become the popular selection of converter topologies.
On the other hand, with the continuous development of intelligent grid and new energy power generation technology, large-scale energy storage link is built
Have become a urgent demand.Energy storage inverter also receives extensively as the key equipment of connection energy storage device and power network
General attention and research.Due to being limited by power semiconductor power, work(that separate unit power electronic current transformer can reach
Rate grade is difficult to the application scenario for meeting high power level, thus high-power applications occasion typically by the inverter of multimode simultaneously
Connection gets up to use, to improve the capacity of system and redundancy；This parallel way is simple and easy simultaneously, is easy to dilatation, thus by
Extensive research and application are arrived.
Although many merits of multiple module paralleling operation become a direction of high-power applications by it, due to more
The characteristics of wired in parallel topology self structure so that energy distribution is uneven between each phase, and during steady-state operation between each bridge arm
Voltage is also impossible to completely the same, causes circulation be present inside each phase bridge arm of current transformer.And the presence of circulation can cause output wave
Deformation is poor, load current distribution is uneven, efficiency reduces, it is also possible to causes output inductor saturation, or even damage system power
The a series of serious problems such as switch, so the key that the loop current suppression of multimode parallel running becomes parallel technology is asked
Topic.
Chinese patent CN201210122767.2《Double combining inverter parallel systems based on the control of voltage zero vector feedforward
Circulation inhibition method》The difference of non-zero dutycycle in two inverter SVPWM is introduced on the basis of conventional PI control method
Feedforward control, but research object is only two-level inverter parallel system, is not directed to three level parallel systems；Chinese patent
CN201210579045.X《The circulation inhibition method of multiple-variable flow device parallel system based on zero-sequence current track with zero error》Introduce
It is related to zero vector and non-zero dutycycle in multiple current transformer SVPWM, but control strategy is excessively complicated；Chinese patent
CN201510126213.3《T-shaped three-level photovoltaic grid-connected inverter parallel connection circulation suppresses and neutral balance method》It is proposed by changing
The service time of change small vector suppresses the control strategy of circulation, and output current wave is made moderate progress, but can not have completely
The suppression zero sequence circulation of effect.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of based on mean power control
With the three-level current transformer compound circulation inhibition method in parallel of optimization SVPWM modulation, can effectively solve three-phase tri-level taken in conjunction
The problem of zero sequence circulation in system be present；The inventive method can reach the effect for preferably controlling three-level current transformer loop current suppression in parallel
Fruit, and reduce system output harmonic wave, improve the stability that parallel system is incorporated into the power networks, the final utilization rate and electricity for improving power network
Net quality.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
A kind of three-level current transformer compound circulation inhibition method in parallel, the current transformer is inverse-impedance type three-level current transformer,
Two current transformers are in parallel by the way of direct current altogether and ac bus；Every current transformer is controlled using mean power, to first
Platform current transformer is sweared using the section space vector modulation of optimization three level seven to second current transformer using the segmentation space of three level seven
Amount modulation；Voltage output caused by the averaged Power Control of First current transformer is as itself optimization three level seven segmentation space arrow
The reference voltage of modulation is measured, voltage output is as itself segmentation of three level seven caused by second averaged Power Control of current transformer
The reference voltage of space vector modulation；
The mean power control is based on traditional two close cycles PI Control System Designs, in the electricity of two close cycles PI control systems
The respectively link that active power and reactive power are added in ring is flowed, it is real-time by average active power and reactive power and current transformer
Active power and reactive power are compared to obtain error current, and error current is superimposed into electric current loop, so as to output voltage
It is adjusted, makes the active power of two current transformer outputs consistent with reactive power, reach the effect for suppressing circulation；
The optimization three level seven section space vector modulation, in traditional section space vector modulated process of three level seven
One regulatory factor f of middle introducing, regulatory factor f was acted on the modulation time of small vector, by the modulation for optimizing small vector
Time, to change the zero sequence dutycycle of current transformer, so as to reduce zero sequence circulation；Consider the symmetrical of parallel converters zero sequence circulation
Property, three level only are used using the section space vector modulation of optimization three level seven, another current transformer to a wherein current transformer
Seven section space vectors are modulated.
Specifically, the mean power control specifically comprises the following steps：
(a1) first, the line voltage line current of two current transformer output ends is sampled, calculates First current transformer
Real-time active power and reactive power be P1And Q1, the real-time active power and reactive power that calculate second current transformer are
P2And Q2；Then, the average active power of two current transformers of calculating and reactive power areWith
(a2) by average active power and reactive power, real-time with every current transformer active power and reactive power are entered respectively
Row compares, and the active power error and reactive power error for obtaining First current transformer areWith
The active power error and reactive power error for obtaining second current transformer beWith
(a3) the value e by active power error divided by voltage on line side in dq coordinate systems on d axlesd, obtain First unsteady flow
The d axis error electric currents of device areThe d axis error electric currents for obtaining second current transformer areBy reactive power
The value e of error divided by voltage on line side in dq coordinate systems on q axlesq, the q axis error electric currents for obtaining First current transformer areThe q axis error electric currents for obtaining second current transformer are
(a4) by the error current Δ i of First current transformer1dWith Δ i1qBelonging to being added on the d axles and q axles of electric current loop,
Reference voltage after PI is controlled as itself optimization three level seven section space vector modulation again；By second current transformer
Error current Δ i2dWith Δ i2qBelonging to being added on the d axles and q axles of electric current loop, then itself three level is used as after PI is controlled
The reference voltage of seven section space vectors modulation.
Specifically, the optimization three level seven section space vector modulation specifically comprises the following steps：
(b1) first, in real time in the detection section space vector modulated process of three level seven in small vector during the effect of vector
Between, the zero sequence dutycycle for calculating First current transformer isCalculate the zero sequence dutycycle of second current transformer
ForWherein, t11And t12The respectively modulation time of the small vector of First current transformer and middle vector, t21And t22
The small vector of respectively second current transformer and the modulation time of middle vector；
(b2) the zero sequence dutycycle of two current transformers is made the difference, draws the zero sequence duty cycle difference of two current transformers
(b3) regulatory factor is added in the modulator of First current transformerSo that the seven of First current transformer
The modulation time of each vector of segmentation is respectively：WithThen
The zero sequence dutycycle of First current transformer is optimized forThen zero of two current transformers after optimization
Sequence duty cycle difference is Δ dz=0；Wherein t13For the modulation time of the big vector of First current transformer.
Beneficial effect：Three-level current transformer provided by the invention compound circulation inhibition method in parallel, compared with prior art,
With following advantage：1st, the control method that the present invention uses can effectively solve zero sequence be present in three-phase tri-level parallel system
The problem of circulation；2nd, be the advantages of three-level structure inverter output du/dt it is small and equivalent switching frequency is high, can reduce simultaneously
The volume of net reactance, be advantageous to modular stack design；Switching loss, the reactor of combining inverter can also be reduced simultaneously
Loss, so as to further improve overall transformation efficiency；3rd, the present invention can be substantially reduced system output harmonic wave, improve parallel system
The stability and power supply reliability being incorporated into the power networks.
Brief description of the drawings
Fig. 1 is the system principle diagram of the present invention；
Fig. 2 is the control block diagram of mean power control；
Fig. 3 is space vector modulation switching sequence figure in small sector I；
Fig. 4 is the space vector timing diagram after adjustment；
Fig. 5 is the oscillogram of zero sequence dutycycle before and after addition regulatory factor f (after 0.25s)；
In Fig. 6：(a) it is the A phase circulation oscillograms before suppression；(b) control and optimize using mean power after being 0.25s and adjust
A phase circulation oscillograms after system；
In Fig. 7：(a) it is the zero sequence circulation simulation waveform before suppression；(b) after mean power control is added after being 0.25s
Zero sequence circulation simulation waveform；(c) the zero sequence circulation added after being 0.25s after mean power control and optimization modulation emulates ripple
Shape figure.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
It is as shown in Figure 1 a kind of three-level current transformer compound circulation inhibition method in parallel, the current transformer is inverse-impedance type three
Level current transformer, two current transformers are in parallel by the way of direct current altogether and ac bus；Mean power is used to every current transformer
Control, to First current transformer using the section space vector modulation of optimization three level seven, three level are used to second current transformer
Seven section space vectors are modulated；Voltage output caused by the averaged Power Control of First current transformer optimizes three level as itself
The reference voltage of seven section space vectors modulation, voltage output caused by second averaged Power Control of current transformer are used as itself
The reference voltage of the section space vector of three level seven modulation.
The control block diagram of mean power control is illustrated in figure 2, mean power control is controlled based on traditional two close cycles PI
System design, the respectively link of active power and reactive power is added in the electric current loop of two close cycles PI control systems, by flat
Error current is obtained compared with equal active power and reactive power active power real-time with current transformer and reactive power, by error
Electric current is superimposed into electric current loop, so as to which output voltage be adjusted, the active power and reactive power that allow two current transformers to export
Unanimously, the effect for suppressing circulation is reached.The mean power control specifically comprises the following steps：
(a1) first, the line voltage line current of two current transformer output ends is sampled, calculates First current transformer
Real-time active power and reactive power be P1And Q1, the real-time active power and reactive power that calculate second current transformer are
P2And Q2；Then, the average active power of two current transformers of calculating and reactive power areWith
(a2) by average active power and reactive power, real-time with every current transformer active power and reactive power are entered respectively
Row compares, and the active power error and reactive power error for obtaining First current transformer areWith
The active power error and reactive power error for obtaining second current transformer beWith
(a3) the value e by active power error divided by voltage on line side in dq coordinate systems on d axlesd, obtain First unsteady flow
The d axis error electric currents of device areThe d axis error electric currents for obtaining second current transformer areBy reactive power
The value e of error divided by voltage on line side in dq coordinate systems on q axlesq, the q axis error electric currents for obtaining First current transformer areThe q axis error electric currents for obtaining second current transformer are
(a4) by the error current Δ i of First current transformer1dWith Δ i1qBelonging to being added on the d axles and q axles of electric current loop,
Reference voltage after PI is controlled as itself optimization three level seven section space vector modulation again；By second current transformer
Error current Δ i2dWith Δ i2qBelonging to being added on the d axles and q axles of electric current loop, then itself three level is used as after PI is controlled
The reference voltage of seven section space vectors modulation.
Under the control of electric current loop, can by the output voltage undulated control of each current transformer in minimum zone, because
This zero sequence circulation can be effectively suppressed.
The optimization three level seven section space vector modulation, in traditional section space vector modulated process of three level seven
One regulatory factor f of middle introducing, regulatory factor f was acted on the modulation time of small vector, by the modulation for optimizing small vector
Time, to change the zero sequence dutycycle of current transformer, so as to reduce zero sequence circulation；Consider the symmetrical of parallel converters zero sequence circulation
Property, three level only are used using the section space vector modulation of optimization three level seven, another current transformer to a wherein current transformer
Seven section space vectors are modulated.
In traditional section space vector modulated process of three level seven, the model of n-th (n=1,2) platform current transformer is：
In formula：dnj∈ { 1,0, -1 } represents the switching tube state of n-th current transformer, and j represents phase；ea,eb,ecRepresent power network
Voltage；uonFor neutral point of electric network voltage；uc1,uc2For the condenser voltage of DC side；ina,inb,incFor the three of n-th current transformer
Phase output current；LnFor the AC filter inductance of n-th current transformer；C1,C2For DC bus capacitor device；inoFor n-th current transformer
DC current.
Assuming thatBy taking First current transformer as an example, its averaging model is：
To simplify the analysis, it is transformed to using dq coordinate system transformations, above-mentioned model：
The zero sequence circulation for defining n-th current transformer is inz=ina+inb+inc, and due to i1z=-i2z, therefore zero sequence circulation
Model may be defined as：
Wherein：d1z=d1a+d1b+d1cAnd d2z=d2a+d2b+d2cRespectively First current transformer and second current transformer
Zero sequence dutycycle.
Because line impedance can be ignored, therefore above formula can be reduced to：
It is illustrated in figure 3 by taking small sector I as an example, traditional three-level current transformer space vector modulation switching sequence figure.
Optimize the modulation of the section space vector of three level seven, draw in traditional section space vector modulated process of three level seven
Enter a regulatory factor f, regulatory factor f was acted on the modulation time of small vector, by optimizing the modulation time of small vector,
To change the zero sequence dutycycle of current transformer, so as to reduce zero sequence circulation.
After adding regulatory factor f, space vector modulation switching sequence figure is as shown in Figure 4 in small sector I.
Optimize the modulation of the section space vector of three level seven to specifically comprise the following steps：
(b1) first, in real time in the detection section space vector modulated process of three level seven in small vector during the effect of vector
Between, the zero sequence dutycycle for calculating First current transformer isCalculate the zero sequence dutycycle of second current transformer
ForWherein, t11And t12The respectively modulation time of the small vector of First current transformer and middle vector, t21And t22
The small vector of respectively second current transformer and the modulation time of middle vector；
(b2) the zero sequence dutycycle of two current transformers is made the difference, draws the zero sequence duty cycle difference of two current transformers
(b3) regulatory factor is added in the modulator of First current transformerSo that the seven of First current transformer
The modulation time of each vector of segmentation is respectively：WithThen
The zero sequence dutycycle of First current transformer is optimized forThen zero of two current transformers after optimization
Sequence duty cycle difference is Δ dz=0；Wherein t13For the modulation time of the big vector of First current transformer.
The oscillogram (after 0.25s) for adding current transformer zero sequence duty cycle error before and after regulatory factor f is illustrated in figure 5,
Amplitude represents amplitude.
Emulation is carried out by software Matlab/Simulink to topological sum control method proposed by the invention to test
Card, as a result as shown in Figure 6 and Figure 7, Current represent electric current.It can thus be seen that the level of one kind three proposed by the invention becomes
Parallel operation compound circulation inhibition method in parallel can effectively suppress zero sequence circulation in three-phase tri-level parallel system be present, and significantly
Reduction system output harmonic wave, improve stability and power supply reliability that parallel system is incorporated into the power networks.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of three-level current transformer compound circulation inhibition method in parallel, the current transformer is inverse-impedance type three-level current transformer, two
Platform current transformer is in parallel by the way of direct current altogether and ac bus；It is characterized in that：Mean power control is used to every current transformer
System, to First current transformer using the section space vector modulation of optimization three level seven, three level seven are used to second current transformer
Section space vector is modulated；Voltage output caused by the averaged Power Control of First current transformer optimizes three level seven as itself
Section space vector modulation reference voltage, voltage output caused by second averaged Power Control of current transformer as itself three
The reference voltage of the section space vector of level seven modulation；
The mean power control is based on two close cycles PI Control System Designs, is added in the electric current loop of two close cycles PI control systems
Active power and reactive power divide equally link, by average active power and reactive power and the real-time active power of current transformer and
Reactive power is compared to obtain error current, and error current is superimposed into electric current loop, so as to which output voltage be adjusted, is allowed
The active power of two current transformer outputs is consistent with reactive power, reaches the effect for suppressing circulation；The mean power control tool
Body comprises the following steps：
(a1) first, the line voltage line current of two current transformer output ends is sampled, calculates the reality of First current transformer
When active power and reactive power be P1And Q1, the real-time active power and reactive power that calculate second current transformer are P2With
Q2；Then, the average active power of two current transformers of calculating and reactive power areWith(a2) will be flat
Equal active power and reactive power compared with real-time with every current transformer active power and reactive power, obtain First respectively
The active power error and reactive power error of current transformer beWithObtain second current transformer
Active power error and reactive power error areWith
(a3) the value e by active power error divided by voltage on line side in dq coordinate systems on d axlesd, obtain the d of First current transformer
Axis error electric current isThe d axis error electric currents for obtaining second current transformer areBy reactive power error
Divided by value e of the voltage on line side in dq coordinate systems on q axlesq, the q axis error electric currents for obtaining First current transformer are
The q axis error electric currents for obtaining second current transformer are
(a4) by the error current Δ i of First current transformer1dWith Δ i1qBelonging to being added on the d axles and q axles of electric current loop, then pass through
Reference voltage after PI controls as itself optimization three level seven section space vector modulation；By the error electricity of second current transformer
Flow Δ i2dWith Δ i2qBelonging to being added on the d axles and q axles of electric current loop, then itself segmentation of three level seven is used as after PI is controlled
The reference voltage of space vector modulation；
The optimization three level seven section space vector modulation, introduces one in the section space vector modulated process of three level seven
Regulatory factor f, regulatory factor f was acted on the modulation time of small vector, by optimizing the modulation time of small vector, to change
The zero sequence dutycycle of current transformer, so as to reduce zero sequence circulation；The symmetry of parallel converters zero sequence circulation is considered, only to wherein one
Platform current transformer uses the section space vector of three level seven using the section space vector modulation of optimization three level seven, another current transformer
Modulation.
2. three-level current transformer according to claim 1 compound circulation inhibition method in parallel, it is characterised in that：The optimization
The modulation of the section space vector of three level seven specifically comprises the following steps：
(b1) first, the action time of vector in small vector in the section space vector modulated process of three level seven is detected in real time,
The zero sequence dutycycle for calculating First current transformer isThe zero sequence dutycycle for calculating second current transformer isWherein, t11And t12The respectively modulation time of the small vector of First current transformer and middle vector, t21And t22Point
Wei not the small vector of second current transformer and the modulation time of middle vector；
(b2) the zero sequence dutycycle of two current transformers is made the difference, draws the zero sequence duty cycle difference of two current transformers
(b3) regulatory factor is added in the modulator of First current transformerSo that seven segmentations of First current transformer
Each the modulation time of vector is respectively：WithThen first
The zero sequence dutycycle of platform current transformer is optimized forThe then zero sequence duty of two current transformers after optimization
It is Δ d than differencez=0；Wherein t13For the modulation time of the big vector of First current transformer.
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| CN102629837B (en) * | 2012-04-24 | 2014-09-17 | 哈尔滨工业大学 | Method for circulating current restraining of parallel system of dual grid-connected inverters based on zero voltage vector feedforward control |
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Address after: 210093 Nanjing University Science Park, 22 Hankou Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Southeast University Address before: 211189 No. 2 Southeast University Road, Jiangning District, Nanjing, Jiangsu Patentee before: Southeast University |
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Application publication date: 20161012 Assignee: GuoChong Charging Technology JiangSu Co., Ltd. Assignor: Southeast University Contract record no.: 2019320010009 Denomination of invention: Three-level current converter parallel composite circulation current suppression method Granted publication date: 20180403 License type: Exclusive License Record date: 20190312 |