CN100471016C - Three phase rectifying bridge DC side parallel type active electric power filter - Google Patents
Three phase rectifying bridge DC side parallel type active electric power filter Download PDFInfo
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- CN100471016C CN100471016C CNB2006100953120A CN200610095312A CN100471016C CN 100471016 C CN100471016 C CN 100471016C CN B2006100953120 A CNB2006100953120 A CN B2006100953120A CN 200610095312 A CN200610095312 A CN 200610095312A CN 100471016 C CN100471016 C CN 100471016C
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Abstract
A type of three-phase commutating bridge direct current side parallel active filter is disclosed. The filter includes: capacitance, inductance, three low frequency bidirectional power switches and four high frequency bidirectional power switches. Thereinto: three low frequency bidirectional power switches are connected with three input ends of three-phase commutating bridge, and two serial bidirectional booster power transformer which consist of capacitance, inductance and four high frequency bidirectional power switches are paralleled in the direct current side of the whole commutating bridge. The invention suits for the harmonic wave management of three-phase commutating bridge especially. Comparing with the traditional dynamic current source electric filter, the invention reduces the number of high frequency source switches; and comparing with power density calibrator, the invention just processes the harmonic component of the load current, the processing current is smaller, and it can reduce the nominal capacity of harmonic wave management device greatly, and reduces the cost greatly too.
Description
Technical field
The invention belongs to the Active Power Filter-APF technical field, particularly a kind of parallel connection type active electric filter.
Background technology
A large amount of rectifier bridge devices that use are the main sources that produce harmonic wave in the electric power system.In order to suppress this rahmonic, generally adopt power factor correction (PFC) and parallel connection type active electric filter (APF) at present, they are two kinds of major programmes at rectifier bridge load harmonic wave control.Wherein, PFC administers harmonic pollution from the angle in harmonic carcellation source.The pfc circuit of all structures all needs to handle whole power outputs, has limited its practical application.At three-phase system, do not find a kind of three-phase PFC solution of comparative maturity in the industry as yet especially.APF carries out the dynamic real-time compensation to load harmonic wave and reactive current, only need handle harmonic wave and reactive power, and for PFC, its processing power is little.Simultaneously, the influence that compensation characteristic is changed by electric network impedance is less, and does not have the danger of " harmonic wave amplification ".Thereby be considered to a kind of up-and-coming harmonic wave management method.Yet, because present APF all is mounted in the electrical network AC side, electric current and voltage moves at 4 quadrants, need more high frequency power switching device, main circuit cost height, and the real-time harmonic current that detects of conventional APF needs, the control circuit complexity has also limited the application of parallel connection type active electric filter (APF).
DC side parallel type active electric power filter is applied in fields such as high voltage direct current transmissions, is used to improve the filtering characteristic of passive filter, the ripple of filtering converter output dc voltage and electric current.But the AC side output current harmonics is not suppressed; Simultaneously, DC side parallel type active electric power filter also is used in high precision DC power supply and the high response speed power supply, be used to improve the stable state accuracy and the dynamic property of direct voltage or direct current, do not have compensate function for the input current of rectifier bridge AC side.All three phase rectifying bridge DC side Active Power Filter-APFs all are used for the harmonic component of filtering load, still do not have report and research and be used for the rectifier bridge DC side parallel type active electric power filter that rectifier bridge lambda line current harmonics administers.
Summary of the invention
First purpose of the present invention provides that a kind of circuit is simple, cost is relatively low, and can carry out the parallel connection type active electric filter of harmonic wave control to the three-phase commutation bridge load.
Second purpose of the present invention provides a kind of control circuit that is applicable to above-mentioned parallel connection type active electric filter.
For reaching first goal of the invention, the invention provides technical scheme is a kind of three phase rectifying bridge DC side parallel type active electric power filter.This filter comprises bidirectional voltage boosting type power inverter, low frequency two-way power switch pipe and the control circuit that has high frequency two-way power switch pipe.Bidirectional voltage boosting type power inverter of the present invention has two, they separately respectively by each inductance, each high frequency two-way power switch pipe and each electric capacity of series connection successively and in the junction of this inductance and this high frequency two-way power switch pipe each again tap the circuit of another high frequency two-way power switch pipe constitute.These two bidirectional voltage boosting type power inverters are cascaded by the high frequency two-way power switch pipe of two electric capacity, two taps is connected on the points of common connection.This points of common connection is connected with the AC side and the AC network of three-phase commutation bridge by three low frequency two-way power switch pipes, and the input that the bidirectional voltage boosting type power inverter of these two series connection is positioned at two inductance one sides is connected on the positive-negative output end of three phase rectifying bridge DC side.
For reaching second goal of the invention, the invention provides such control circuit that is used for this three phase rectifying bridge DC side parallel type active electric power filter.This control circuit comprises, two just are being serially connected in three phase rectifying bridge DC side, each current sensor of negative output terminal, be connected in parallel on the phase detecting circuit of AC network, in parallel with two electric capacity of connecting or with any one electric capacity voltage sample circuit in parallel wherein, with with the output of two current sensors, the output of phase detecting circuit, control and driver element for one of the output connection of voltage sample circuit, this control is connected to be used to drive them with four high frequency two-way power switch pipes with three low frequency two-way power switch pipes respectively with the output of driver element.
Superiority of the present invention is as follows:
1, the present invention is particularly suitable for the harmonic wave control at the three-phase commutation bridge load.
When being used to suppress the harmonic current of rectifier bridge front end injection electrical network, can make whole rectifier bridge device approaching sinusoidal wave from the electric current that electrical network absorbs, power factor is approximately 1.Compare with traditional AC side Active Power Filter-APF, can reduce the quantity of high frequency active switch, therefore, circuit is simple relatively, cost is also relatively low; Compare with power factor corrector, the present invention only handles the harmonic component in the load current, and the electric current of processing is littler, can reduce the rated capacity of harmonic treating apparatus, has also reduced cost widely.
2, because the present invention moves on to traditional Active Power Filter-APF the DC side of three-phase commutation bridge, this DC side APF only needs in two quadrant operations of electric current and voltage, DC side APF circuit structure of the present invention is simplified, has the few advantage of little, the used active switch quantity of processing power, cost reduces greatly, makes it to be used widely in industry.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1---rectifier bridge DC side Active Power Filter-APF schematic diagram
Fig. 2---rectifier bridge DC side Active Power Filter-APF control circuit schematic diagram
Fig. 3 a---three-phase voltage interval division figure
Fig. 3 b---low frequency bidirectional switch control timing figure
Fig. 4---interval II equivalent circuit diagram
Fig. 5 a---do not add a phase input current waveform figure of DC side Active Power Filter-APF
Fig. 5 b---do not add the b phase input current waveform figure of DC side Active Power Filter-APF
Fig. 5 c---do not add the c phase input current waveform figure of DC side Active Power Filter-APF
Fig. 6 a---add a phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 6 b---add the b phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 6 c---add the c phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 6 d---add the compensating inductance L1 current waveform figure behind the DC side Active Power Filter-APF
Fig. 6 e---add the compensating inductance L2 current waveform figure behind the DC side Active Power Filter-APF
Embodiment
A kind of three phase rectifying bridge DC side parallel type active electric power filter (with reference to figure 1).This filter comprises bidirectional voltage boosting type power inverter, low frequency two-way power switch pipe and the control circuit that has high frequency two-way power switch pipe.In the present invention, bidirectional voltage boosting type power inverter has two, they separately respectively by each inductance (L1, L2), each high frequency two-way power switch pipe (Sp2, Sn2) and each electric capacity (Cp, Cn) of series connection successively and in the junction of this inductance (L1, L2) and this high frequency two-way power switch pipe (Sp2, Sn2) respectively again tap the circuit formation of another high frequency two-way power switch pipe (Sp1, Sn1).These two bidirectional voltage boosting type power inverters are cascaded by the high frequency two-way power switch pipe (Sp1, Sn1) of two electric capacity (Cp, Cn), two taps is connected on the points of common connection; This points of common connection is connected with AC side and the AC network DW of three-phase commutation bridge ZLQ by three low frequency two-way power switch pipes (Sa, Sb, Sc).The input that the bidirectional voltage boosting type power inverter DCAPF of these two series connection is positioned at two inductance (L1, L2) side is connected on the positive-negative output end of described three-phase commutation bridge ZLQ DC side.
Obviously, so-called AC network DW can be mains supply, also can be the output of generator.It will be apparent to those skilled in that according to other conditioned disjunction needs, the value of two inductance (L1, L2) wherein can equate, also can be unequal.
Further, into each inductance of on three branch roads of three low frequency two-way power switch pipes (Sa, Sb, Sc), can connecting respectively in addition, just a in Fig. 1, b, c three places respectively seal in an inductance.
In addition, three low frequency two-way power switch pipes (Sa, Sb, Sc) can also be connected with the bidirectional voltage boosting type power inverter DCAPF of two series connection by an inductance that is connected on described points of common connection place, and just the e place in Fig. 1 seals in an inductance.
Above-mentioned three phase rectifying bridge DC side parallel type active electric power filter, can with existing and with the control circuit of its adaptation come to its control with drive wherein each low frequency, high frequency two-way power switch pipe.Also can aim at it the control circuit that adapts to more is set, control circuit of the present invention is exactly one of them.This control circuit (with reference to figure 2) comprises, two just are being serially connected in three-phase commutation bridge ZLQ DC side, each current sensor (CT1 of negative output terminal, CT2), be connected in parallel on the phase detecting circuit VT of AC network DW, with two electric capacity (Cp that connect, Cn) voltage sample circuit PT in parallel or in parallel with any one electric capacity (Cp or Cn) wherein is (owing to obvious, voltage sample circuit PT and any one electric capacity (Cp or Cn) accompanying drawing in parallel have been omitted), with with two current sensor (CT1, CT2) output, the output of phase detecting circuit VT, control that the output of voltage sample circuit PT connects and driver element KZQDDL, the output of this control and driver element KZQDDL respectively with three low frequency two-way power switch pipe (Sa, Sb, Sc) and four high frequency two-way power switch pipe (Sp1, Sp2, Sn1, Sn2) connect to be used to drive them.
Further, the described phase detecting circuit VT that is connected in parallel on AC network DW, perhaps all be connected or only be connected or only be connected (same because obvious, as also to omit the accompanying drawing of back two kinds of situations) with wherein any phase line with wherein any two phase lines with the triple line of this AC network DW.
Circuit below in conjunction with above-mentioned embodiment discloses is further introduced its harmonic wave control process.
Phase detecting circuit VT of the present invention obtains the control timing of three three phase low frequency two-way power switch pipes (Sa, Sb, Sc) by detection of grid voltage, be divided into 6 intervals in each electrical network power frequency period, three three-phase two-way power switch pipes (Sa, Sb, Sc) are operated in two times of power frequencies (with reference to figure 3a, Fig. 3 b).In any one interval, AC network DW, three-phase commutation bridge ZLQ and parallel connection type DC side Active Power Filter-APF can equivalence be two bidirectional voltage boosting type power inverters that are connected in series (with reference to figure 4, this figure has only drawn out the equivalent circuit diagram at interval II).Obtain the current signal of three-phase commutation bridge ZLQ output respectively by current sensor (CT1, CT2), voltage sample circuit PT obtains the voltage signal of dc bus capacitor (Cp, Cn or Cp or Cn), control can adopt the PWM control mode to produce the control signal of each high frequency two-way power switch pipe (Sp1, Sp2, Sn1, Sn2) with driver element KZQDDL, and the low frequency two-way power switch pipe (Sa, Sb, Sc) in the driving filter circuit of the present invention and the break-make of high frequency two-way power switch pipe (Sp1, Sp2, Sn1, Sn2), the function of realization harmonic wave control.Fig. 5 a, Fig. 5 b, Fig. 5 c are respectively a, the b that does not insert filter of the present invention, input current (Ia, Ib, the Ic) oscillogram of c three-phase.As can be seen, its input current waveform wherein contains a large amount of harmonic components near square wave from three oscillograms.Fig. 6 a, Fig. 6 b, Fig. 6 c are a, b, c phase input current (Ia, Ib, the Ic) oscillograms behind the access filter of the present invention.Be not difficult to find that a after the improvement, b, c phase input current (Ia, Ib, Ic) be very approaching sine wave after the oscillogram of contrast, their power factor is approximately 1.Fig. 6 d, Fig. 6 e are electric current (IL1, the IL2) oscillograms of compensating inductance L1, L2 behind the access filter of the present invention.From latter two oscillogram, become sinusoidal wave change procedure from harmonic wave control as can be seen.
Adopt the present invention, only need 4 high frequency power switches, can reduce cost, reduce compensation capacity. The present invention only needs Four two-way power switch pipes can be so that the cost of three-phase commutation bridge harmonic treating apparatus, and compensation capacity reduces. This The selection of bright middle inductance, electric capacity and each power switch pipe thereof is identical with the principle that existing wave filter is selected, so design parameter does not disclose.
Claims (7)
1, a kind of three phase rectifying bridge DC side parallel type active electric power filter, this filter comprises the bidirectional voltage boosting type power inverter that has high frequency two-way power switch pipe, low frequency two-way power switch pipe and control circuit, it is characterized in that, described bidirectional voltage boosting type power inverter has two, and they are separately respectively by each the inductance (L1 that connects successively, L2), each high frequency two-way power switch pipe (Sp2, Sn2) and each electric capacity (Cp, Cn), and at this inductance (L1, L2) and this high frequency two-way power switch pipe (Sp2, Sn2) junction each again tap another high frequency two-way power switch pipe (Sp1, Sn1) circuit constitutes; These two bidirectional voltage boosting type power inverters pass through two electric capacity (Cp, Cn), the high frequency two-way power switch pipe (Sp1 of two taps, Sn1) be connected on the points of common connection and be cascaded, this points of common connection is by three described low frequency two-way power switch pipe (Sa, Sb, Sc) be connected with the AC side and the AC network (DW) thereof of three-phase commutation bridge (ZLQ), the bidirectional voltage boosting type power inverter (DCAPF) of these two series connection is positioned at two inductance (L1, L2) input of a side is connected on the positive-negative output end of described three-phase commutation bridge (ZLQ) DC side.
2, three phase rectifying bridge DC side parallel type active electric power filter according to claim 1 is characterized in that, is in series with each inductance on three branch roads of described three low frequency two-way power switch pipes (Sa, Sb, Sc) respectively.
3, three phase rectifying bridge DC side parallel type active electric power filter according to claim 1 and 2, it is characterized in that described three low frequency two-way power switch pipes (Sa, Sb, Sc) are connected with the bidirectional voltage boosting type power inverter (DCAPF) of two series connection by an inductance that is connected on described points of common connection place.
4, three phase rectifying bridge DC side parallel type active electric power filter according to claim 1 and 2, it is characterized in that, described control circuit comprises, two just are being serially connected in described three-phase commutation bridge (ZLQ) DC side, each current sensor (CT1 of negative output terminal, CT2), be connected in parallel on the phase detecting circuit (VT) of AC network (DW), with described two electric capacity (Cp that connect, Cn) in parallel or with any one electric capacity (Cp or Cn) voltage sample circuit (PT) in parallel wherein, with with two current sensor (CT1, CT2) output, the output of phase detecting circuit (VT), control that the output of voltage sample circuit (PT) connects and driver element (KZQDDL), the output of this control and driver element (KZQDDL) respectively with three low frequency two-way power switch pipe (Sa, Sb, Sc) and four high frequency two-way power switch pipe (Sp1, Sp2, Sn1, Sn2) connect to be used to drive them.
5, three phase rectifying bridge DC side parallel type active electric power filter according to claim 3, it is characterized in that, described control circuit comprises, two just are being serially connected in described three-phase commutation bridge (ZLQ) DC side, each current sensor (CT1 of negative output terminal, CT2), be connected in parallel on the phase detecting circuit (VT) of AC network (DW), with described two electric capacity (Cp that connect, Cn) in parallel or with any one electric capacity (Cp or Cn) voltage sample circuit (PT) in parallel wherein, with with two current sensor (CT1, CT2) output, the output of phase detecting circuit (VT), control that the output of voltage sample circuit (PT) connects and driver element (KZQDDL), the output of this control and driver element (KZQDDL) respectively with three low frequency two-way power switch pipe (Sa, Sb, Sc) and four high frequency two-way power switch pipe (Sp1, Sp2, Sn1, Sn2) connect to be used to drive them.
6, three phase rectifying bridge DC side parallel type active electric power filter according to claim 4, it is characterized in that, the described phase detecting circuit (VT) that is connected in parallel on AC network (DW) perhaps all is connected with the triple line of this AC network (DW) or only is connected with wherein any two phase lines or only is connected with wherein any phase line.
7, three phase rectifying bridge DC side parallel type active electric power filter according to claim 5, it is characterized in that, the described phase detecting circuit (VT) that is connected in parallel on AC network (DW) perhaps all is connected with the triple line of this AC network (DW) or only is connected with wherein any two phase lines or only is connected with wherein any phase line.
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| CNB2006100953120A CN100471016C (en) | 2006-12-19 | 2006-12-19 | Three phase rectifying bridge DC side parallel type active electric power filter |
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| CNB2006100953120A CN100471016C (en) | 2006-12-19 | 2006-12-19 | Three phase rectifying bridge DC side parallel type active electric power filter |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455402B (en) * | 2010-11-02 | 2014-08-13 | 上海华普汽车有限公司 | Rectifier bridge detector |
| CN102025146B (en) * | 2010-11-27 | 2012-11-21 | 南京航空航天大学 | Double-switch direct current active power filter and control method thereof |
| CN102130572B (en) * | 2011-04-28 | 2012-12-05 | 重庆大学 | Three-phase rectifier bridge direct-current side parallel connection type active power filter |
| CN102496933B (en) * | 2011-11-25 | 2014-11-05 | 东北大学 | Double parallel active power filtering apparatus |
| CN102739082B (en) * | 2012-06-21 | 2014-06-18 | 厦门普罗太克科技有限公司 | Three-phase rectification step-down circuit with power coefficient calibrating function |
| CN103545811B (en) * | 2012-07-18 | 2016-03-30 | 南京航空航天大学 | A kind of Active Power Filter-APF based on Double-bridge type main circuit and control method thereof |
| CN105553249B (en) * | 2016-01-05 | 2018-09-18 | 福州大学 | Wide-voltage range low voltage stress current-injecting three-phase power factor correcting circuit |
| CN108233736B (en) * | 2018-01-16 | 2020-08-11 | 南京航空航天大学 | Multi-objective optimization design method for AC/DC converter of aviation multi-electric engine |
| CN110011309A (en) * | 2019-04-26 | 2019-07-12 | 苏州普雷斯顿智能科技有限公司 | A kind of all band hybrid filter |
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- 2006-12-19 CN CNB2006100953120A patent/CN100471016C/en active Active
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