CN109586590A - Multi purpose space vector modulation method for current source type converter - Google Patents

Multi purpose space vector modulation method for current source type converter Download PDF

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Publication number
CN109586590A
CN109586590A CN201811447217.1A CN201811447217A CN109586590A CN 109586590 A CN109586590 A CN 109586590A CN 201811447217 A CN201811447217 A CN 201811447217A CN 109586590 A CN109586590 A CN 109586590A
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current
vector
common
mode voltage
voltage
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CN109586590B (en
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何晋伟
张昌浩
***
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Tianjin University
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Tianjin University
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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
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • 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
    • H02M1/123—Suppression of common mode voltage or current
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a kind of multi purpose space vector modulation methods for current source type converter, can while reducing current source converter common-mode voltage compensation system it is idle, step are as follows: 1. convert 9 vector states being mapped to 9 kinds of switching current states of current source converter under α β space coordinates according to clark；2. calculating the corresponding common-mode voltage of each vector, proposing, which reduces the method for selecting zero vector, reduces system common-mode voltage；3. distinguishing control system active reactive by control current transformer d axis, q shaft current, and thereby determine that current transformer modulates reference vector under current transformer grid entry point voltage current transformation to dq coordinate；4. determining three switching vector selectors of synthesized reference vector by ampere-second equilibrium principle, determine that zero vector corresponds to switch state further according to the method in step 2.The modulator approach realizes active reactive independent control by dq coordinate transform, while selecting the minimum zero vector of common-mode voltage for synthesized reference vector reduction system common-mode voltage.

Description

Multi purpose space vector modulation method for current source type converter
Technical field
The present invention relates to a kind of multi-functional current source type current transformer space vector modulating methods, and in particular to one kind can be same When reduce current source converter common-mode voltage and realize current transformer maximum power factor operation modulator approach.
Background technique
Semiconductor Converting Technology is electric energy to be changed into exchange by direct current or exchange is changed into the technology of direct current, in current industrial application In play important role.Three-phase current source type current transformer is very widely used, and principle is to build main electricity using switching tube Road, then cooperate corresponding modulator approach, the switch state of control switch pipe makes input/output current waveform near sinusoidal.Electric current The basic principle of source current transformer space vector modulating method is by nine kinds of PWM current status warps of current source type three phase full bridge current transformer It crosses coordinate transform and obtains nine kinds of quiescent current vectors, then three phase sine reference current is shown that reference current is sweared by coordinate transform And thus amount, selects that several vectors are according to ampere-second equilibrium principle synthesized reference current phasor in nine quiescent current vectors later, Determine the switch state of each switching tube.Theory deduction and experiment show that space vector modulation has DC current utilization rate height, The advantages that harmonic characterisitic is good.
Since Traditional Space vector modulation method does not select zero vector, the common-mode voltage peak value of current transformer is higher, It is unfavorable for system insulation.Using increase common mode reactor method, although can to a certain degree reduce common-mode voltage influence, But increase system bulk and cost.On the other hand because the presence of AC side of converter LC filter circuit filter capacitor, will cause Grid nodes have leading power factor.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of for the more of current source type converter Functional space vector modulation method can reduce current transformer in the case where common mode reactor or common mode reactor very little is not added The operation of current transformer maximum power factor is realized while common-mode voltage.
The purpose of the present invention is what is be achieved through the following technical solutions:
Multi purpose space vector modulation method for current source type converter, comprising the following steps:
(1) Clarke coordinate transform is carried out to the corresponding three-phase PWM electric current of 9 kinds of switch states of current source type converter, By the two-phase Space current vector that three-phase PWM current transformation is on α β plane, and by two-phase Space current vector according to length point It is two groups: zero vector (Ia0、Ib0And Ic0), non-zero vector (I1…I6)；Transformation for mula is (1-1)
Wherein, iwa(t)、iwb(t)、iwcIt (t) is three-phase PWM electric current, iα(t)、iβIt (t) is two-phase Space current vector I (t) α, beta -axis component；
(2) by current source type converter common-mode voltage production principle, the common-mode voltage that each switch state generates is calculated, is obtained To the modulator approach for reducing common-mode voltage；
(3) current transformer grid entry point voltage, electric current are mapped under dq rotating coordinate system through Parker coordinate transform, pass through control Current transformer d axis, q shaft current control current transformer active reactive, realize the operation of current transformer maximum power factor, and thereby determine that space The reference vector of Vector Modulation；
(4) three switching vector selectors and the action time of synthesized reference vector are determined by ampere-second equilibrium principle, and according to step (2) method in determines that zero vector corresponds to switch state.
Further, the step (2) specifically comprises the following steps:
(1) current transformer common-mode voltage is determined by formula (1-2):
Wherein vcmvFor current transformer common-mode voltage, vgpAnd vgnFor the upper and lower Bus Voltage of current transformer DC side；
(2) 9 switch states are calculated and corresponds to common-mode voltage, in the case where ignoring exchange side filter inductance pressure drop, by formula It is U that (1-2), which can obtain zero vector and generate common-mode voltage peak value,m, it is 0.5U that non-zero vector, which corresponds to common-mode voltage peak value,m, UmFor power grid phase Voltage peak；
(3) the smallest zero vector of common-mode voltage is selected for synthesized reference vector according to network voltage:
Wherein va、vb、vcFor power grid three-phase voltage.
Further, in the step (3), realize that current transformer active reactive independent control includes the following steps:
(1) network voltage, grid-connected current are transformed under dq rotating coordinate system by Parker formula (1-4), and computing system Active reactive:
Wherein ω is network voltage angular speed, and t is the time；For voltage vector under dq coordinate, Ugd、UgqFor voltage vectorD axis q axis component；For current phasor under dq coordinate, Igd、IgqFor current phasorD axis q axis component, ia、ib、icTo become Flow device three-phase grid electric current；P, Q is that current transformer is active and reactive power；
(2) controlled respectively by formula (1-6) current transformer d axis q shaft current can autonomous control system active reactive power, and by This determines reference vector.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. the present invention can reduce current source type converter common-mode voltage simultaneously and realize the operation of system unit power factor. For current source converter common-mode voltage problem, calculates each switching vector selector and generate common-mode voltage.Current transformer common mode is pointed out in analysis Voltage peak corresponds to switch state by zero vector and generates, and proposes to reduce system common-mode electricity by the method for selecting zero vector thus Pressure.Aiming at the problem that LC filter causes system leading power factor, direct Power Control strategy is proposed.In dq rotating coordinate system Under to current transformer d axis q shaft current independent control, the reactive current for compensating LC filter realizes current transformer maximum power factor fortune Row.System reference modulating wave is obtained by power control strategy, then the space vector modulating method by selecting zero vector determines switch Signal, driving current transformer operation.
2. calculating each switch state of current source converter corresponds to common-mode voltage.Point out system common-mode voltage peak value by zero Vector generates, and the method by selecting zero vector reduces current transformer common-mode voltage peak value.It is asked simultaneously for leading power factor Topic realizes direct Power Control by decoupled active and reactive under dq coordinate, current source converter maximum power factor can be made to run.
3. the multi purpose space Vector Modulation strategy proposed by the present invention based on current source converter can reduce unsteady flow Compensation system reactive current guarantees the operation of system maximum power factor while device common-mode voltage.
Detailed description of the invention
Fig. 1 is current source rectifier topology structure schematic diagram in the embodiment of the present invention.
Fig. 2 is the three dimensional vector diagram of current source converter.
Fig. 3 is common-mode voltage simulation waveform.
Fig. 4 is current transformer DC side load current simulation waveform.
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are respectively AC side of converter network voltage, grid-connected current and PWM current waveform Figure.
Specific embodiment
The multi purpose space vector modulation method to of the invention based on current source converter is specifically real with reference to the accompanying drawing The mode of applying is described, so that those skilled in the art more fully understands the present invention.
By taking current source rectifier as an example, Fig. 1 is the circuit diagram of the specific embodiment of the invention.As shown in Figure 1, current source type For rectifier using three phase full bridge topology as rectification circuit, each full-bridge is in the present embodiment band by six power switch tubes The IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) of backward dioded is formed.
Multi purpose space vector modulation method basic step of the sheet of the present invention for current source rectifier is as follows:
Step 1: according to current source converter constraint condition: any moment a certain full-bridge has simultaneously and only there are two derailing switches Part conducting, one is located at upper half-bridge, another is located at lower half-bridge.Under this constraint condition, current source rectifier can determine 9 Kind three-phase PWM current status.9 kinds of three-phase PWM current status are obtained into 9 kinds of two-phase Space current vectors by coordinate transform.This A little vectors can be divided into two groups according to length: zero vector (With), non-zero vectorTransformation for mula is (2- 1), three dimensional vector diagram is shown in Fig. 2, and corresponding switch state classification is shown in Table 1.
Wherein, iwa(t)、iwb(t)、iwcIt (t) is three-phase PWM electric current, iα(t)、iβIt (t) is two-phase Space current vector I (t) α, beta -axis component.
Table 1
Step 2: calculating each vector and generate common-mode voltage, common-mode voltage can be determined by following formula
Wherein vcmvFor current transformer common-mode voltage, vgpAnd vgnFor the upper and lower Bus Voltage of current transformer DC side.
Each switch state corresponds to common-mode voltage and is shown in Table 1 right side.It can be seen that non-zero vector generation common-mode voltage peak value is 0.5Um, UmFor power grid phase voltage peak value；It is U that zero vector, which generates common-mode voltage peak value,m.Therefore, the primary of common-mode voltage is inhibited to appoint Business is exactly common-mode voltage caused by reducing zero vector.To reduce common-mode voltage amplitude, using selecting zero vector method.I.e. each A sampling instant online real time collecting current source type converter net side three-phase power grid voltage amplitude, selects wherein that absolute value of voltage is most Small power grid phase voltage, the space vector for selecting corresponding zero vector to use as this sampling period according to formula (2-3).
Wherein va、vb、vcFor power grid three-phase voltage.
Step 3: network voltage, grid-connected current are transformed under dq rotating coordinate system by Parker (park) formula (2-4), and Computing system active reactive.
Wherein ω is network voltage angular speed, and t is the time；For voltage vector under dq coordinate, Ugd、UgqFor voltage vector d Axis q axis component；For current phasor under dq coordinate, Igd、IgqFor current phasor d axis q axis component, ia、ib、icFor current transformer three-phase Grid-connected current；P, Q is that current transformer is active and reactive power.
Step 4: by formula (2-6), control respectively current transformer d axis q shaft current can autonomous control system active reactive power, And thereby determine that space vector reference vector.
Wherein Id_refAnd Iq_refFor space vector modulation wave d axis q axis reference vector, kp1、ki1And kp2、ki2Respectively d axis q Axis PI control parameter, PrefIt is active for system reference
Step 5: dq coordinate system modulated reference vector is transformed under α β two-phase stationary coordinate system.By two non-zero vectors With a zero vector according to ampere-second equilibrium principle synthesized reference vector Iref(t).Specific synthesis mode are as follows: as shown in Fig. 2, with reference to Vector two non-zero vectors of sector and zero vector after formula (2-3) is selected where it synthesize
Step 6: building simulation model with Matlab/Simulink, converter control method proposed by the present invention is carried out Verifying.For the validity for verifying technical solution of the present invention, use Traditional Space Vector Modulation not to zero vector before 0.2s is emulated It selects, but uses the mentioned power control strategy of this patent, use the mentioned multi purpose space Vector Modulation strategy of this patent after 0.2s.
Fig. 3 is two kinds of modulation strategy common-mode voltage comparisons.It can be seen that when using Traditional Space vector modulation method, altogether Mode voltage peak value is power grid phase voltage peak value ± 311V, after 0.2s uses this patent control strategy, common-mode voltage peak value becomes ± 180V.It can thus be seen that this patent propose based on current source type converter multi purpose space vector control strategy to common mode The inhibitory effect of voltage is very significant.
Fig. 4 is DC side load current, it can be seen that two methods switching front and back DC side electric current is unchanged, illustrates this specially The mentioned control strategy of benefit does not influence rectifier DC current capability.
Fig. 5 is phase voltage, phase current and the PWM current waveform of rectifier net side.As can be seen that in switching moment phase current There is no transient state distortion with PWM electric current, and switch front and back electric current THD without significant change, illustrates three zero vectors to ac-side current Influence be it is equivalent, also illustrate that the mentioned control strategy of this patent does not cause the abnormal of alternating current while reducing common-mode voltage Become.Furthermore it can be seen that three-phase power grid voltage is consistent with corresponding power network current phase, illustrate that reactive compensation strategy can be corrected The leading power factor as caused by filter capacitor realizes the operation of system unit power factor.
To sum up the present invention can reduce current source type converter common-mode voltage simultaneously and realize current transformer unity power factor Operation, is a kind of New type of current source current transformer control strategy being worthy to be popularized.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.

Claims (3)

1. being used for the multi purpose space vector modulation method of current source type converter, which comprises the following steps:
(1) Clarke coordinate transform is carried out to the corresponding three-phase PWM electric current of 9 kinds of switch states of current source type converter, by three Phase PWM current transformation is the two-phase Space current vector on α β plane, and two-phase Space current vector is divided into two according to length Group: zero vector (Ia0、Ib0And Ic0), non-zero vector (I1…I6)；Transformation for mula is (1-1)
Wherein, iwa(t)、iwb(t)、iwcIt (t) is three-phase PWM electric current, iα(t)、iβBe (t) α of two-phase Space current vector I (t), Beta -axis component；
(2) by current source type converter common-mode voltage production principle, the common-mode voltage that each switch state generates is calculated, is dropped The modulator approach of low common-mode voltage；
(3) current transformer grid entry point voltage, electric current are mapped under dq rotating coordinate system through Parker coordinate transform, by controlling unsteady flow Device d axis, q shaft current control current transformer active reactive, realize the operation of current transformer maximum power factor, and thereby determine that space vector The reference vector of modulation；
(4) three switching vector selectors and the action time of synthesized reference vector are determined by ampere-second equilibrium principle, and according in step (2) Method determine that zero vector corresponds to switch state.
2. being used for the multi purpose space vector modulation method of current source type converter according to claim 1, which is characterized in that The step (2) specifically comprises the following steps:
(1) current transformer common-mode voltage is determined by formula (1-2):
Wherein vcmvFor current transformer common-mode voltage, vgpAnd vgnFor the upper and lower Bus Voltage of current transformer DC side；
(2) 9 switch states are calculated and corresponds to common-mode voltage, in the case where ignoring exchange side filter inductance pressure drop, by formula (1-2) It is U that zero vector, which can be obtained, and generate common-mode voltage peak valuem, it is 0.5U that non-zero vector, which corresponds to common-mode voltage peak value,m, UmFor power grid phase voltage Peak value；
(3) the smallest zero vector of common-mode voltage is selected for synthesized reference vector according to network voltage:
Wherein va、vb、vcFor power grid three-phase voltage.
3. being used for the multi purpose space vector modulation method of current source type converter according to claim 1, which is characterized in that In the step (3), realize that current transformer active reactive independent control includes the following steps:
(1) network voltage, grid-connected current are transformed under dq rotating coordinate system by Parker formula (1-4), and computing system is active It is idle:
Wherein ω is network voltage angular speed, and t is the time；For voltage vector under dq coordinate, Ugd、UgqFor voltage vectorD Axis q axis component；For current phasor under dq coordinate, Igd、IgqFor current phasorD axis q axis component, ia、ib、icFor current transformer Three-phase grid electric current；P, Q is that current transformer is active and reactive power；
(2) controlled respectively by formula (1-6) current transformer d axis q shaft current can autonomous control system active reactive power, and thus really Determine reference vector.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071656A (en) * 2019-05-10 2019-07-30 天津大学 A kind of five phase current source type current transformer common-mode voltage suppressing methods
CN110920422A (en) * 2019-11-06 2020-03-27 天津大学 High-power electric vehicle charging device based on current source and control method
CN111049411A (en) * 2019-11-20 2020-04-21 天津大学 Modulation method of three-phase four-leg current source type converter
CN112583288A (en) * 2020-12-21 2021-03-30 天津大学合肥创新发展研究院 Short pulse control PWM wave modulation method for current source type converter
CN112636570A (en) * 2020-12-24 2021-04-09 天津大学合肥创新发展研究院 Harmonic suppression method of current source type converter based on NS-SVM control

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US20100172161A1 (en) * 2009-01-07 2010-07-08 Rockwell Automation Technologies, Inc. Systems and methods for common-mode voltage reduction in ac drives
CN105226930A (en) * 2015-09-23 2016-01-06 北京能高自动化技术股份有限公司 A kind of reactive power control method being applied to grid-connected current transformer
CN107786114A (en) * 2016-08-24 2018-03-09 申茂军 A kind of new PWM inverter topological structure
CN108768189A (en) * 2018-06-29 2018-11-06 天津大学 A kind of space vector modulating method based on parallel-current source type current transformer

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US20100172161A1 (en) * 2009-01-07 2010-07-08 Rockwell Automation Technologies, Inc. Systems and methods for common-mode voltage reduction in ac drives
CN105226930A (en) * 2015-09-23 2016-01-06 北京能高自动化技术股份有限公司 A kind of reactive power control method being applied to grid-connected current transformer
CN107786114A (en) * 2016-08-24 2018-03-09 申茂军 A kind of new PWM inverter topological structure
CN108768189A (en) * 2018-06-29 2018-11-06 天津大学 A kind of space vector modulating method based on parallel-current source type current transformer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071656A (en) * 2019-05-10 2019-07-30 天津大学 A kind of five phase current source type current transformer common-mode voltage suppressing methods
CN110920422A (en) * 2019-11-06 2020-03-27 天津大学 High-power electric vehicle charging device based on current source and control method
CN110920422B (en) * 2019-11-06 2022-07-29 天津大学 High-power electric vehicle charging device based on current source and control method
CN111049411A (en) * 2019-11-20 2020-04-21 天津大学 Modulation method of three-phase four-leg current source type converter
CN112583288A (en) * 2020-12-21 2021-03-30 天津大学合肥创新发展研究院 Short pulse control PWM wave modulation method for current source type converter
CN112636570A (en) * 2020-12-24 2021-04-09 天津大学合肥创新发展研究院 Harmonic suppression method of current source type converter based on NS-SVM control

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