CN103490416A - Fundamental voltage sharing type medium-voltage active power filter - Google Patents

Fundamental voltage sharing type medium-voltage active power filter Download PDF

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Publication number
CN103490416A
CN103490416A CN201310413004.8A CN201310413004A CN103490416A CN 103490416 A CN103490416 A CN 103490416A CN 201310413004 A CN201310413004 A CN 201310413004A CN 103490416 A CN103490416 A CN 103490416A
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CN
China
Prior art keywords
phase
active power
power filter
capacitor
fundamental voltage
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
CN201310413004.8A
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Chinese (zh)
Inventor
刘亚丽
李国栋
袁世强
胡晓辉
袁中琛
王峥
王瑶
徐永海
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.)
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, State Grid Tianjin Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201310413004.8A priority Critical patent/CN103490416A/en
Publication of CN103490416A publication Critical patent/CN103490416A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20Active power filtering [APF]

Abstract

The invention relates to a fundamental voltage sharing type medium-voltage active power filter. The fundamental voltage sharing type medium-voltage active power filter comprises a three-phase inverter, three-phase H bridge cascaded inverting unit modules with each phase of H bridge cascaded inverting unit modules divided into N sets and three inductors with each phase being the same. The fundamental voltage sharing type medium-voltage active power filter further comprises three alternating-current capacitors with each phase being the same, and each phase of output end of the three-phase inverter is connected with each phase of N-set H bridge cascaded inverting unit modules, each phase of inductors and each phase of alternating current capacitors in series, and then is connected with a power grid in parallel. According to the fundamental voltage sharing type medium-voltage active power filter, the number of the inverting unit modules of the active power filter can be greatly reduced, the cost is lowered, the structure of a compensation device is simplified, the reliability of the device is improved, the size of the device is decreased, and full play is given to the harmonic wave compensating capacity of the active power filter.

Description

A kind of fundamental voltage is shared in type and is pressed with active power filter
Technical field
The invention belongs to medium voltage distribution network harmonic compensation device technical field, especially a kind of fundamental voltage is shared in type and is pressed with active power filter.
Background technology
Various high power electronic equipment obtains increasingly extensive application; these devices are when significantly enhancing productivity; also to electric power system, bring very large harmonic pollution; cause the multiple harm such as power consumption equipment overload, overheated, loss increase, overvoltage of capacitor, protection misoperation, so the demand of power network harmonic wave management is in continuous increase.
Active Power Filter-APF is the active comprehensive compensating device consisted of full control power electronic device, has high controllability and fast-response, can the harmonic wave of frequency and size variation be compensated, and can avoid and electrical network generation resonance.
But, cost is higher is the principal element that the restriction Active Power Filter-APF is promoted, for at the mesohigh electrical network, the fundamental voltage of electrical network all is applied on inverter, be subject to the restriction of switching device withstand voltage level and capacity, the cost of Active Power Filter-APF is higher, makes it be difficult to be widely applied in the mesohigh electrical network.And Active Power Filter-APF is combined with passive filter and the mixed active electric power filter that forms, can make up the inherent shortcoming of passive filter, can give full play to again the advantage of Active Power Filter-APF, become the focus of this area research.
Wherein, the hybrid filtering scheme in parallel with electrical network after the people such as nineteen ninety H.Fujit propose passive filter and Active Power Filter-APF are in series, its harmonic wave is mainly compensated by passive filter, and Active Power Filter-APF suppresses the parallel resonance between passive filter and electric network impedance for improving the harmonic compensation effect of passive filter.Capacitor in passive filter, born most fundamental voltage, thereby the fundamental voltage that makes Active Power Filter-APF bear is less, and the capacity of active part reduces.But in mesohigh, large capacity applications occasion, in above-mentioned mixed active electric power filter, AC electric capacity bears most fundamental voltage, therefore larger fundamental current need to be arranged by capacitor, this makes the Active Power Filter Harmonic Currents compensation ability weaken; In addition, the volume of large value capacitor that bears high voltage is larger, has increased the floor space of device; Simultaneously, also there is still higher problem of DC capacitor voltage.
The people such as F.Z.Peng by University of Tennessee have proposed Cascade H bridge multi-electrical level inverter master topological structure in 1996, its each brachium pontis is in series at AC by N single-phase full bridge module, DC side is separate, and three brachium pontis connect and compose three-phase system by Y type (or △ type).With respect to the many level current transformers of diode clamp type and the many level current transformers of striding capacitance type, this each converter cell structure of Cascade H bridge multi-electrical level inverter is identical, owing to having adopted modularized design and standard package, is convenient to suitability for industrialized production, and cost of investment is low; DC bus capacitor is separate, easily realizes electric voltage equalization; Each converter cell symmetrical configuration, switching frequency is low and loss is little, and overall efficiency is high.But the Active Power Filter-APF that adopts Cascade H bridge multi-electrical level inverter requires to control a plurality of independent direct current capacitance voltages, control system complexity.While being applied to the high voltage appearance grade, the unit module of cascade is more, and cost is higher, and structure is more complicated, thereby has limited its application.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of fundamental voltage to share in type and be pressed with active power filter.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of fundamental voltage is shared in type and is pressed with active power filter, comprise three-phase inverter, every three-phase H bridge cascade inversion unit module and three every mutually identical inductance of organizing for N mutually, it is characterized in that: also further comprise three every mutually identical AC capacitor, every phase output terminal of three-phase inverter respectively with H bridge cascade inversion unit module, every phase inductance and every cross streams capacitor's series of every phase N group, then in parallel with electrical network.
And described every by AC capacitor and inductance circuit in series, it is identical that the series resonance number of times is that Active Power Filter-APF is wanted the main harmonic number of low order of filtering.
And, in a preferred 10kv electrical network instantiation, described AC capacitor load voltage value is 3.5kV, the inversion unit number of modules is 5.
And the structure of single-phase inverter is identical with the phase structure in three-phase inverter.
And, adopt the 6kV electrical network example of single-phase inverter as of the present invention another, in this is single-phase, the load voltage value of AC capacitor is 2.5kV, the inversion unit number of modules is 4.
Advantage of the present invention and good effect are:
The invention discloses a kind of fundamental voltage that belongs to medium voltage distribution network harmonic compensation device technical field shares in type and is pressed with active power filter, filter of the present invention has 1 AC capacitor, 1 inductance and N organize single-phase H bridge cascade inversion unit and are in series and form an integral body, be connected to respectively the three-phase output end of 1 three-phase inverter, then parallel connection accesses compensation point, carry out harmonic compensation, the present invention can greatly reduce Active Power Filter-APF inversion unit number of modules, reduce costs, simplify the compensation arrangement structure, improve device reliability, reduce device volume, give full play to the harmonic compensation ability of Active Power Filter-APF.
The accompanying drawing explanation
Figure 1 shows that fundamental voltage of the present invention is shared in type is pressed with the active power filter topology diagram;
Figure 2 shows that current Cascade H bridge multi-electrical level inverter master topology diagram.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described, it is emphasized that following execution mode is illustrative, rather than determinate, can not using this execution mode as limitation of the invention.
A kind of fundamental voltage is shared in type and is pressed with active power filter, as shown in Figure 1, comprise three-phase inverter 4, every be the three-phase H bridge cascade inversion unit module 3 of N group, three every mutually identical inductance 2 and three every mutually identical AC capacitor 1 mutually, every phase output terminal of three-phase inverter respectively with H bridge cascade inversion unit module, every phase inductance and every cross streams capacitor's series of every phase N group, then in parallel with electrical network.
Described every by AC capacitor and inductance circuit in series, it is identical that the series resonance number of times is that Active Power Filter-APF is wanted the main harmonic number of low order of filtering.
The H bridge cascade inversion unit module of described every phase N group, between every group of unit module for being connected in series, form many level structure, bear certain fundamental voltage, after each H bridge inversion unit module is connect by the H bridging by 4 IGBT with anti-paralleled diode and direct current capacitor compose in parallel, the voltage source that direct current capacitor is H bridge inversion unit, H bridge inversion unit module is the prime power unit of H bridge cascade multilevel inverter.
Every three-phase H bridge cascade inversion unit module of organizing for N is mutually shared the also fundamental voltage of site electrical network with three every mutually identical AC capacitor, thereby make three-phase inverter bear very little fundamental voltage, and then make the three-phase inverter DC voltage lower, adopt ripe at present power electronic device to form a three-phase inverter and just can carry out the compensation of harmonic current.
Due to every mutually in AC capacitor and N group H bridge cascade inversion unit module share the also fundamental voltage of site electrical network, therefore, the present invention compares with current Fig. 2 topology, multi-electrical level inverter only bears the part fundamental voltage, required inversion unit number of modules can reduce.
In the concrete enforcement of a 10kv electrical network of the present invention, when AC capacitor is selected, suitably improving its load voltage value is 3.5kV, like this, when inversion unit breaks down, by control, the fundamental voltage that AC capacitor is born is suitably increased, and the voltage that each inversion unit module is born is constant, thereby can omit the redundant module of required consideration while adopting current Fig. 2 topological structure, the inversion unit module, from current 6, reduces to 5.
In the electrical network that adopts single-phase inverter, the structure of single-phase inverter is identical with the phase structure in three-phase inverter, as another 6kV electrical network of the present invention, adopt in the example of single-phase inverter, when AC capacitor is selected, load voltage value in this single-phase middle AC capacitor is 2.5kV, and the inversion unit number of modules, by current 7, reduces to 4.

Claims (5)

1. a fundamental voltage is shared in type and is pressed with active power filter, comprise three-phase inverter, every three-phase H bridge cascade inversion unit module and three every mutually identical inductance of organizing for N mutually, it is characterized in that: also further comprise three every mutually identical AC capacitor, every phase output terminal of three-phase inverter respectively with H bridge cascade inversion unit module, every phase inductance and every cross streams capacitor's series of every phase N group, then in parallel with electrical network.
2. fundamental voltage according to claim 1 is shared in type and is pressed with active power filter, it is characterized in that: described every by AC capacitor and inductance circuit in series, it is identical that the series resonance number of times is that Active Power Filter-APF is wanted the main harmonic number of low order of filtering.
3. fundamental voltage according to claim 1 is shared in type and is pressed with active power filter, it is characterized in that: in a preferred 10kv electrical network instantiation, described AC capacitor load voltage value is 3.5kV, and the inversion unit number of modules is 5.
4. fundamental voltage according to claim 1 is shared in type and is pressed with active power filter, it is characterized in that: the structure of single-phase inverter is identical with the phase structure in three-phase inverter.
5. share in type and be pressed with active power filter according to the described fundamental voltage of claim 1 or 4, it is characterized in that: as of the present invention another, adopt the 6kV electrical network example of single-phase inverter, in this is single-phase, the load voltage value of AC capacitor is 2.5kV, and the inversion unit number of modules is 4.
CN201310413004.8A 2013-09-12 2013-09-12 Fundamental voltage sharing type medium-voltage active power filter Pending CN103490416A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104883084A (en) * 2015-05-26 2015-09-02 清华大学 Neutral-point clamped cascade H-bridge hybrid multilevel converter
CN106229981A (en) * 2016-08-24 2016-12-14 许继集团有限公司 The control method of chain type Active Power Filter-APF and control device
CN109473987A (en) * 2018-12-17 2019-03-15 广西电网有限责任公司电力科学研究院 A kind of high-frequency harmonic paralleling compensating device based on silicon carbide

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CN101651347A (en) * 2009-09-18 2010-02-17 南京航空航天大学 Parallel-connection type active power filter
CN102195289A (en) * 2011-07-18 2011-09-21 华北电力大学 Cascade-structure-based hybrid active power filter
CN102420533A (en) * 2011-12-04 2012-04-18 中国科学院电工研究所 Hybrid multilevel current conversion circuit topology structure and control method thereof
CN102545681A (en) * 2012-01-18 2012-07-04 南京航空航天大学 Step wave synthesis three-phase inverter capable of eliminating low frequency harmonic waves and control method

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JP2003061250A (en) * 2001-08-10 2003-02-28 Mitsubishi Electric Corp Voltage fluctuation compensator
CN101651347A (en) * 2009-09-18 2010-02-17 南京航空航天大学 Parallel-connection type active power filter
CN102195289A (en) * 2011-07-18 2011-09-21 华北电力大学 Cascade-structure-based hybrid active power filter
CN102420533A (en) * 2011-12-04 2012-04-18 中国科学院电工研究所 Hybrid multilevel current conversion circuit topology structure and control method thereof
CN102545681A (en) * 2012-01-18 2012-07-04 南京航空航天大学 Step wave synthesis three-phase inverter capable of eliminating low frequency harmonic waves and control method

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104883084A (en) * 2015-05-26 2015-09-02 清华大学 Neutral-point clamped cascade H-bridge hybrid multilevel converter
CN106229981A (en) * 2016-08-24 2016-12-14 许继集团有限公司 The control method of chain type Active Power Filter-APF and control device
CN106229981B (en) * 2016-08-24 2020-01-14 许继集团有限公司 Control method and control device of chain type active power filter
CN109473987A (en) * 2018-12-17 2019-03-15 广西电网有限责任公司电力科学研究院 A kind of high-frequency harmonic paralleling compensating device based on silicon carbide

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Application publication date: 20140101