CN102332724A - Three-phase four-bridge-arm active power filter under one-cycle control - Google Patents
Three-phase four-bridge-arm active power filter under one-cycle control Download PDFInfo
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- CN102332724A CN102332724A CN201110304473A CN201110304473A CN102332724A CN 102332724 A CN102332724 A CN 102332724A CN 201110304473 A CN201110304473 A CN 201110304473A CN 201110304473 A CN201110304473 A CN 201110304473A CN 102332724 A CN102332724 A CN 102332724A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses a three-phase four-bridge-arm active power filter under one-cycle control. The three-phase four-bridge-arm active power filter consists of a one-cycle controller and a four-bridge-arm converter, wherein the four-bridge-arm converter comprises a three-phase full-bridge (1) and a fourth bridge-arm single-phase half-bridge (2); the three-phase full-bridge (1) and the fourth bridge-arm single-phase half-bridge (2) respectively adopt an independent one-cycle control circuit; and the one-cycle controller consists of a three-phase full-bridge one-cycle control circuit and a fourth bridge-arm one-cycle control circuit. The three-phase four-bridge-arm active power filter under the one-cycle control has the advantages that: harmonic, middle-wire and reactive currents in a three-phase four-wire system can be effectively compensated; and the controller is simple in structure, easy to implement, high in control accuracy, free from a static error and a dynamic error, high in response speed and good in compensation effect.
Description
Technical field
The present invention relates to a kind of converters, especially a kind of three-phase four-arm Active Power Filter-APF of Cycle Control.
Background technology
Along with the development of power electronic technology, harmonic wave in the electrical network and idle problem are serious day by day, and this brings very big harm for the stable operation of electrical network.Therefore, the quality of power supply that must take effective measure to improve.Active Power Filter-APF is a kind of novel electric power electric device that is used for dynamically suppressing harmonic wave, compensating reactive power; Its produce with load current in harmonic current and reactive current equal and opposite in direction, offset current in the opposite direction, the harmonic wave and the reactive current of big or small and frequency change compensated.Classical APF need produce current reference, needs the very complicated control of utilization.
Summary of the invention
The objective of the invention is to provide a kind of three-phase four-arm Active Power Filter-APF of Cycle Control, need not to produce current reference, only need input current and converter dc voltage are detected.
For achieving the above object; The present invention is made up of one-cycle controller and four-arm converter; Four-arm converter comprises three phase full bridge and the 4th brachium pontis single-phase semi-bridge; Three phase full bridge and the 4th brachium pontis single-phase semi-bridge adopt respectively independently Cycle Control circuit; Wherein three phase full bridge Cycle Control circuit is made up of computing circuit, comparator, trigger and clock circuit, and the 4th brachium pontis Cycle Control circuit is made up of reset circuit, integrator, comparator, R-S trigger, absolute value circuit, proportion differential circuit and gate circuit, and one-cycle controller is made up of three phase full bridge Cycle Control circuit and the 4th brachium pontis Cycle Control circuit.
The active filter of Cycle Control is a three-phase four-arm reversible transducer, works in rectification and inverter mode.During rectification, energy flows to DC side, the capacitor C charging, and during inversion, energy flows to AC side, and the capacitor C discharge has guaranteed that dc voltage remains unchanged in the one-period, thereby required harmonic wave of system and reactive power compensation electric current is provided.Inductance L f is used for the caused current ripples of switch of level and smooth power tube.This three-phase four-arm converter is made up of a three phase full bridge and one the 4th brachium pontis single-phase semi-bridge, and their shared electric capacity is to provide the DC side busbar voltage.Three phase full bridge is used to provide harmonic wave and reactive power compensation electric current, reaching A, B, the input current Ia of C three-phase, Ib, Ic waveform near sinusoidal, and with three-phase voltage Va, Vb, Vc do not have the purpose of phase difference; The 4th brachium pontis single-phase semi-bridge is used to provide the zero sequence compensation electric current, to eliminate the current in middle wire that unbalanced load causes.
The present invention can effectively compensate harmonic wave, center line and the reactive current in the three-phase four-wire system, and controller architecture is simple, is easy to realize; Control precision is high, has not both had static receiver error, does not also have dynamic error; Response speed is fast, and compensation effect is good.
Description of drawings
Fig. 1 is the four-arm converter circuit diagram.
Fig. 2 is the structural representation of three phase full bridge Cycle Control circuit.
Fig. 3 is the 4th brachium pontis Cycle Control circuit figure.
Embodiment
The present invention adopts the mode of the duty ratio of control switch, the mean value of switching variable in each cycle is equated or proportional with the control reference signal, thus elimination stable state and transient error.
Form by one-cycle controller and four-arm converter; Four-arm converter comprises three phase full bridge (1) and the 4th brachium pontis single-phase semi-bridge (2); Three phase full bridge (1) and the 4th brachium pontis single-phase semi-bridge (2) adopt respectively independently Cycle Control circuit; Wherein three phase full bridge Cycle Control circuit is made up of computing circuit (3), comparator (5), trigger (4) and clock circuit (6); The 4th brachium pontis Cycle Control circuit is made up of reset circuit (11), integrator (10), comparator (8), R-S trigger (12), absolute value circuit (9), proportion differential circuit (7) and gate circuit (13), and one-cycle controller is made up of three phase full bridge Cycle Control circuit and the 4th brachium pontis Cycle Control circuit.
Fig. 1 works in rectification and inverter mode for the four-arm converter circuit diagram is a three-phase four-arm reversible transducer.During rectification, energy flows to DC side, the capacitor C charging, and during inversion, energy flows to AC side, and the capacitor C discharge has guaranteed that dc voltage E remains unchanged in the one-period, thereby required harmonic wave of system and reactive power compensation electric current is provided.Inductance L f is used for the caused current ripples of switch of level and smooth power tube.This three-phase four-arm converter is made up of a three phase full bridge (1) and one the 4th brachium pontis single-phase semi-bridge (2), and their shared electric capacity is to provide the DC side busbar voltage.Three phase full bridge (1) is used to provide harmonic wave and reactive power compensation electric current, reaching A, B, the input current Ia of C three-phase, Ib, Ic waveform near sinusoidal, and with three-phase voltage Va, Vb, Vc do not have the purpose of phase difference; The 4th brachium pontis single-phase semi-bridge (2) is used to provide the zero sequence compensation electric current, to eliminate the current in middle wire that unbalanced load causes.
Fig. 2 is the structural representation of three phase full bridge Cycle Control circuit, and Sap, San, Sbp, Sbn, Scp, Scn are the drive signal of switching tube; Vref surveys feedback voltage for the four-arm converter direct current.Because Active Power Filter-APF requires energy two-way flow between AC side and dc capacitor side, so converter works in the four-quadrant attitude, and the drive signal of two switches of each brachium pontis is set to complementation, is respectively Dn and 1-Dn.
Governing equation is following:
VM=in the formula
; K1-constant; E-dc voltage; The measuring resistance of RS-power supply input current, power supply is surveyed equivalent resistance after RE-compensation three phase harmonic and the reactive current.This equation has been described the relation between source current, duty cycle of switching and three amounts of inverter direct-flow side capacitance voltage, and this governing equation is realized by breadboardin.
Fig. 3 is the 4th brachium pontis Cycle Control circuit diagram, is used for the zero-sequence current of compensation network, make one-cycle control active power filter provide load-side required whole currents in middle wire, thereby the current in middle wire of mains side is zero.Controlled target is:
The 4th brachium pontis Cycle Control circuit is made up of reset circuit (11), integrator (10), comparator (8), R-S trigger (12), absolute value circuit (9), proportion differential circuit (7) and gate circuit (13).As Vref>0 the time, because the output of comparator (8) makes that Snp keeps turn-offing, after clock signal clk arrives; The Snn conducting; Integrator (10) begins the integration to Icn, and when being integrated to greater than Vref, comparator (8) upset also produces reset signal; Integrator (10) is reset, thereby turn-offs Snn.When the next cycle clock signal arrived by the time, the action that repeats the last cycle again was until Vref < 0.When Vref 0 the time, Snn keeps turn-offing, the same analysis, Snp works on off state according to the action of integrator.
Claims (1)
1. the three-phase four-arm Active Power Filter-APF of a Cycle Control; Form by one-cycle controller and four-arm converter; Four-arm converter comprises three phase full bridge (1) and the 4th brachium pontis single-phase semi-bridge (2); It is characterized in that: three phase full bridge (1) and the 4th brachium pontis single-phase semi-bridge (2) adopt respectively independently Cycle Control circuit; Wherein three phase full bridge Cycle Control circuit is made up of computing circuit (3), comparator (5), trigger (4) and clock circuit (6); The 4th brachium pontis Cycle Control circuit is made up of reset circuit (11), integrator (10), comparator (8), R-S trigger (12), absolute value circuit (9), proportion differential circuit (7) and gate circuit (13), and one-cycle controller is made up of three phase full bridge Cycle Control circuit and the 4th brachium pontis Cycle Control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110304473A CN102332724A (en) | 2011-10-10 | 2011-10-10 | Three-phase four-bridge-arm active power filter under one-cycle control |
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| CN201110304473A CN102332724A (en) | 2011-10-10 | 2011-10-10 | Three-phase four-bridge-arm active power filter under one-cycle control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553430A (en) * | 2016-01-28 | 2016-05-04 | 昆山九华电子设备厂 | Three-level switch power amplifier based on one-cycle control technology and algorithm model thereof |
| CN106130380A (en) * | 2016-07-18 | 2016-11-16 | 国家电网公司 | A kind of mixing one circle control method improved in modular multilevel commutator |
| CN106786661A (en) * | 2017-03-21 | 2017-05-31 | 哈尔滨理工大学 | Three-phase four-wire system four bridge legs APF based on one-cycle control |
| CN107069727A (en) * | 2017-03-01 | 2017-08-18 | 江苏林洋能源股份有限公司 | A kind of improved one-cycle controller, electric energy quality controller and micro net power quality control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2744057Y (en) * | 2004-07-06 | 2005-11-30 | 华南理工大学 | Double bridge inverse single cycle control active filter |
| US20080055947A1 (en) * | 2006-08-30 | 2008-03-06 | Jun Wen | Converters For High Power Applications |
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2011
- 2011-10-10 CN CN201110304473A patent/CN102332724A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2744057Y (en) * | 2004-07-06 | 2005-11-30 | 华南理工大学 | Double bridge inverse single cycle control active filter |
| US20080055947A1 (en) * | 2006-08-30 | 2008-03-06 | Jun Wen | Converters For High Power Applications |
Non-Patent Citations (2)
| Title |
|---|
| 庄华等: "基于单周控制的四桥臂三相四线制有源电力滤波器的研究", 《继电器》 * |
| 李成君等: "基于单周控制的串联混合型APF的研究", 《电测与仪表》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553430A (en) * | 2016-01-28 | 2016-05-04 | 昆山九华电子设备厂 | Three-level switch power amplifier based on one-cycle control technology and algorithm model thereof |
| CN105553430B (en) * | 2016-01-28 | 2018-07-24 | 昆山九华电子设备厂 | Tri-level switch power amplifier based on the one-cycle control technique and control device |
| CN106130380A (en) * | 2016-07-18 | 2016-11-16 | 国家电网公司 | A kind of mixing one circle control method improved in modular multilevel commutator |
| CN106130380B (en) * | 2016-07-18 | 2018-07-06 | 国家电网公司 | Improved mixing one circle control method in a kind of modular multilevel rectifier |
| CN107069727A (en) * | 2017-03-01 | 2017-08-18 | 江苏林洋能源股份有限公司 | A kind of improved one-cycle controller, electric energy quality controller and micro net power quality control method |
| CN107069727B (en) * | 2017-03-01 | 2019-08-16 | 江苏林洋能源股份有限公司 | A kind of improved one-cycle controller, electric energy quality controller and micro net power quality control method |
| CN106786661A (en) * | 2017-03-21 | 2017-05-31 | 哈尔滨理工大学 | Three-phase four-wire system four bridge legs APF based on one-cycle control |
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Application publication date: 20120125 |