CN106921171A - A kind of VSC direct Power Controls method in the case of unbalanced power supply - Google Patents

A kind of VSC direct Power Controls method in the case of unbalanced power supply Download PDF

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Publication number
CN106921171A
CN106921171A CN201710127002.0A CN201710127002A CN106921171A CN 106921171 A CN106921171 A CN 106921171A CN 201710127002 A CN201710127002 A CN 201710127002A CN 106921171 A CN106921171 A CN 106921171A
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CN
China
Prior art keywords
power supply
case
direct power
unbalanced
vsc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710127002.0A
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Chinese (zh)
Inventor
伍葵
于月森
张圆明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN201710127002.0A priority Critical patent/CN106921171A/en
Publication of CN106921171A publication Critical patent/CN106921171A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

A kind of VSC direct Power Controls method in the case of unbalanced power supply, the method is using the orthogonal signal generator (DSOGI_OSG) based on broad sense double integrator, to calculate the quadrature component of control variables, inverter side output voltage uses new estimation scheme, so as to obtain reference current instruction, it is used to realize direct Power Control.Control System Imitation result based on the method proves that this method is effective.

Description

A kind of VSC direct Power Controls method in the case of unbalanced power supply
Technical field
The present invention relates to a kind of direct Power Control method, VSC is direct in the case of more particularly to a kind of unbalanced power supply Poewr control method.
Background technology
Usually there is grid-connection converter and operates in unbalanced power supply working condition in actual distribution formula electricity generation system, and power network is uneven There is earth fault in the most of inputs due to local high power load of the appearance of weighing apparatus, threephase load asymmetric operation or system. During unbalanced power supply, it may appear that the appearance of negative sequence voltage and negative-sequence current, negative-sequence current and voltage can make DC side occur 2 times it is humorous Ripple electric current, and then 2 voltages are produced, the harmonic voltage can produce 3 subharmonic voltages in transducer side again by PWM, enter And produce 3 subharmonic currents.So repeatedly, converter AC occurs odd harmonic voltage and current, converter DC side Even voltage and electric current occurs.Especially, when degree of unbalancedness is higher, larger negative-sequence current component can even damage and be System.
The content of the invention
The technical problems to be solved by the invention are to provide direct Power Control method, energy in the case of a kind of unbalanced power supply Ensure the harmonic wave minimum of galvanic current pressure and alternating current, while the control variables positive-negative sequence for saving complexity is separated and calculated.
The present invention is to solve above-mentioned technical problem by following technical proposals：In the case of a kind of unbalanced power supply directly Poewr control method, it is characterised in that control variables is calculated using the orthogonal signal generator based on broad sense double integrator Quadrature component, so as to obtain reference current instruction, be used to realize direct Power Control.
Positive effect of the invention is：The present invention can effectively eliminate or suppress converter AC harmonic voltage And electric current.
Brief description of the drawings
Fig. 1 is transducer side voltage estimate scheme schematic diagram in the present invention；
Fig. 2 is current reference instruction computing formula schematic diagram in the present invention；
Fig. 3 is control block diagram of the present invention；
Fig. 4 is DC voltage waveform；
Fig. 5 is AC current waveform；
Fig. 6 is transducer side instantaneous active power waveform.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
As shown in figure 1, passing through line voltage and the direct inverter output voltage of power network current and its quadrature component.Electricity in figure The quadrature component of net voltage is directly obtained by the quadrature generator based on broad sense double integrator, in figuree a、e bIt is line voltage A, b component；u a、u bIt is a, b component of inverter output voltage,i a、i bIt is a, b component of power network current, subscript q represents each change The corresponding orthogonal signalling of amount.In figureDSOGI_OSGIt is the quadrature generator based on broad sense double integrator.
As shown in Fig. 2 being reference current computing formula in control method.In figureP refFor system gives power.
As shown in figure 3, being the control block diagram of the control method.Current inner loop uses PR adjusters, and outer voltage uses PI Adjuster.

Claims (2)

1. a kind of VSC direct Power Control methods in the case of unbalanced power supply, it is characterised in that：Using based on broad sense double integral The orthogonal signal generator of device（DSOGI_OSG）To calculate the quadrature component of control variables, so as to obtain reference current instruction, use To realize direct Power Control.
2. VSC direct Power Control methods in the case of a kind of unbalanced power supply according to claim 1, it is characterised in that： Inverter side output voltage uses a kind of new estimation scheme.
CN201710127002.0A 2017-03-06 2017-03-06 A kind of VSC direct Power Controls method in the case of unbalanced power supply Pending CN106921171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710127002.0A CN106921171A (en) 2017-03-06 2017-03-06 A kind of VSC direct Power Controls method in the case of unbalanced power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710127002.0A CN106921171A (en) 2017-03-06 2017-03-06 A kind of VSC direct Power Controls method in the case of unbalanced power supply

Publications (1)

Publication Number Publication Date
CN106921171A true CN106921171A (en) 2017-07-04

Family

ID=59460818

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710127002.0A Pending CN106921171A (en) 2017-03-06 2017-03-06 A kind of VSC direct Power Controls method in the case of unbalanced power supply

Country Status (1)

Country Link
CN (1) CN106921171A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103326399A (en) * 2013-06-09 2013-09-25 浙江大学 Grid-connected inverter control method under unbalanced and harmonic wave power grids
CN103475033A (en) * 2013-09-27 2013-12-25 重庆大学 Current control method and system for three-phase LCL type grid-connected inverter without phase locking link
CN104600696A (en) * 2015-01-05 2015-05-06 上海电力学院 Software phase-locked loop implementation method under unbalanced condition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103326399A (en) * 2013-06-09 2013-09-25 浙江大学 Grid-connected inverter control method under unbalanced and harmonic wave power grids
CN103475033A (en) * 2013-09-27 2013-12-25 重庆大学 Current control method and system for three-phase LCL type grid-connected inverter without phase locking link
CN104600696A (en) * 2015-01-05 2015-05-06 上海电力学院 Software phase-locked loop implementation method under unbalanced condition

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
吴晓波: "非理想电网条件下三电平光伏并网变换器控制研究", 《中国优秀硕士学位论文全文数据库（电子期刊） 工程科技Ⅱ辑》 *
景汝峰: "不平衡条件下光伏并网逆变器控制研究", 《中国优秀硕士学位论文全文数据库（电子期刊） 工程科技Ⅱ辑》 *
王传林: "三相并网逆变器软件锁相技术的研究", 《中国优秀硕士学位论文全文数据库（电子期刊） 工程科技Ⅱ辑》 *

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