CN1988339A - Three phase rectifier bridge active power filter circuit using impedance coupling - Google Patents
Three phase rectifier bridge active power filter circuit using impedance coupling Download PDFInfo
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- CN1988339A CN1988339A CN 200610095395 CN200610095395A CN1988339A CN 1988339 A CN1988339 A CN 1988339A CN 200610095395 CN200610095395 CN 200610095395 CN 200610095395 A CN200610095395 A CN 200610095395A CN 1988339 A CN1988339 A CN 1988339A
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Abstract
This invention relates to an active power filter circuit of a three-phase commutation bridge applying impedance couple including: a capacitor, an inductor, four power switch tubes and an impedance network, in which, the impedance network is connected at the three input ends of the three-phase comutation bridge,two serial two-way boosting power converters composed of capacitors, inductors and four power switch tubes are parallel at the DC side of the commutation bridge. This invention is especially suitable for treatment of harmonic waves loaded by a three-phase commutation bridge.
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
Three-phase commutation bridge is to use load very widely in the electric power system, also is a kind of main harmonic source that electric power system is produced harmonic wave.Three-phase commutation bridge is carried out harmonic wave control, and circuit of power factor correction and active power filter circuit are two kinds of major programmes that adopt at present.Circuit of power factor correction need be handled whole bearing powers, and Active Power Filter-APF all is connected in parallel on AC side at present, and two kinds of schemes are all used more high frequency active switch, and circuit cost is higher, and its practical application all is restricted.
At rectifier bridge DC side parallel active power filter circuit, be applied in fields such as high voltage direct current transmission, special power supplies, but used this DC side active power filter circuit all is the ripples for filtering rectifier bridge output dc voltage and electric current at present, the AC side output current harmonics is not suppressed, the rectifier bridge active filter circuit that is used for the employing impedance coupling of rectifier bridge input current harmonics improvement does not still have report.
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 power filter circuit 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 power filter circuit.
For reaching first goal of the invention, the invention provides technical scheme is a kind of three phase rectifier bridge active power filter circuit that adopts the impedance coupling.This filter circuit comprises bidirectional voltage boosting type power inverter, impedance network and control circuit.Bidirectional voltage boosting type power inverter of the present invention has two, they separately respectively by each inductance, each power switch pipe and each electric capacity of series connection successively and in the junction of this inductance and power switch pipe each again tap the circuit of another power switch pipe constitute.These two bidirectional voltage boosting type power inverters are cascaded by the 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 the impedance network that three impedances constitute, 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 each current sensors that is serially connected in the positive and negative output of three phase rectifying bridge DC side, two positive-negative output ends that are connected across rectifier bridge and electrical network common port, or of with each voltage sample circuit of wherein any one electric capacity parallel connection with output with the output of two current sensors, two voltage sample circuits being connected in parallel with two electric capacity of series connection control and driver element, and this control is connected to be used to drive them with four 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---the three phase rectifier bridge active power filter circuit schematic diagram of impedance coupling
Fig. 2---the three phase rectifier bridge active power filter control circuit schematic diagram of impedance coupling
Fig. 3---three-phase voltage interval division figure
Fig. 4---interval II equivalent circuit diagram
The implementation schematic diagram of Fig. 5---a kind of impedance network
Fig. 6 a---do not add a phase input current waveform figure of DC side Active Power Filter-APF
Fig. 6 b---do not add the b phase input current waveform figure of DC side Active Power Filter-APF
Fig. 6 c---do not add the c phase input current waveform figure of DC side Active Power Filter-APF
Fig. 7 a---add a phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 7 b---add the b phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 7 c---add the c phase input current waveform figure behind the DC side Active Power Filter-APF
Fig. 7 d---add the current waveform figure of the compensating inductance L1 behind the DC side Active Power Filter-APF
Fig. 7 e---add the current waveform figure of the compensating inductance L2 behind the DC side Active Power Filter-APF
Fig. 7 f---add the impedance network common port input current waveform figure behind the DC side Active Power Filter-APF
Embodiment
A kind of three phase rectifier bridge active power filter circuit (with reference to figure 1) that adopts the impedance coupling.This filter circuit comprises bidirectional voltage boosting type power inverter, impedance network and the control circuit that has power switch pipe.In the present invention, bidirectional voltage boosting type power inverter has two, they separately respectively by each inductance (L1, L2), each 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 power switch pipe (Sp2, Sn2) respectively again tap the circuit formation of another power switch pipe (Sp1, Sn1).These two bidirectional voltage boosting type power inverters are cascaded by the 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 impedances (Za, Zb, Zc).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.
Three impedances (Za, Zb, Zc) have multiple implementation, and implementation of the present invention or further feature are, impedance network wherein connects into wye connection by three impedances and constitutes, and the total current that flows to this impedance network is divided equally by three impedance branch roads.That is to say that the resistance value of three impedances equates (with reference to figure 5).Three transformers (T1, T2, T3) among Fig. 5 have identical no-load voltage ratio, and a side of three transformers adopts delta connection, and opposite side adopts wye connection, has just realized needed impedance network among the present invention.
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.
Above-mentioned three phase rectifying bridge DC side parallel type active electric power filter can be with existing and come its control and driving power switching tube with the control circuit of its adaptation.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), 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), be connected across the positive-negative output end of three-phase commutation bridge ZLQ and the voltage sample circuit PT1 of electrical network common port, with with two current sensor (CT1, CT2) output, control that the output of two voltage sample circuits (PT and PT1) is connected and driver element KZQDDY, the output of this control and driver element KZQDDY respectively with four power switch pipe (Sp1, Sp2, Sn1, Sn2) connect to be used to drive them.
Circuit below in conjunction with above-mentioned embodiment discloses is further introduced its harmonic wave control process.
On each electrical network, be divided into 6 intervals (with reference to figure 3) in the cycle frequently.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 that two bidirectional voltage boosting type power inverters that are connected in series are (with reference to figure 4, this figure has only drawn out the equivalent circuit diagram at interval II), in circuit shown in Figure 4, each magnitude of current satisfies following relation:
i
a＝i
p-i
ah (1)
i
b＝-i
bh (2)
i
c＝-i
n-i
ch (3)
And
i
h＝i
p-i
n (4)
Because the three-phase three-wire system system, so
i
a+i
b+i
c＝0 (5)
Because further three impedance Z a, Zb in the feature, the electric current of Zc are divided equally, promptly
Simultaneous (1)-(6) obtain
i
p＝i
a-i
b (7)
i
n＝i
b-i
c (8)
From (7), (8) two formulas as can be seen, adopt suitable control mode to come the break-make situation of power controlling switching tube (Sp1, Sp2, Sn1, Sn2), control rectifier bridge DC side current i
p, i
nJust can realize power factor correction, reach the purpose of harmonic wave control.
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), voltage sample circuit PT1 obtains the voltage signal of rectifier bridge positive and negative terminal, control can adopt the PWM control mode to produce the control signal of each two-way power switch pipe (Sp1, Sp2, Sn1, Sn2) with driver element KZQDDY, and the break-make of the power switch pipe (Sp1, Sp2, Sn1, Sn2) in the driving filter circuit of the present invention, the function of realization harmonic wave control.
Fig. 6 a, Fig. 6 b, Fig. 6 c are respectively a, the b that does not insert filter of the present invention, the input current (i of c three-phase
a, i
b, i
c) oscillogram.As can be seen, its input current waveform wherein contains a large amount of harmonic components near square wave from three oscillograms.Fig. 7 a, Fig. 7 b, Fig. 7 c are a, b, the c phase input current (i behind the access filter of the present invention
a, i
b, i
c) oscillogram.After the oscillogram of contrast, be not difficult to find a after the improvement, b, c phase input current (i
a, i
b, i
c) very approaching sine wave, their power factor is approximately 1.Fig. 7 d, Fig. 7 e, Fig. 7 f are respectively the electric current [i of compensating inductance L1, L2 behind the access filter of the present invention
(L1), i
(L2)] and the current waveform figure of impedance network common port.From back three oscillograms, become sinusoidal wave change procedure from harmonic wave control as can be seen.
The present invention only needs four power switch pipes, can be so that the cost of three-phase commutation bridge harmonic treating apparatus reduce, and compensation capacity reduces.The principle that the selection of inductance, electric capacity and each power switch pipe thereof and existing filter are selected among the present invention is identical, so the not disclosure of concrete parameter.
Claims (3)
1, a kind of three phase rectifier bridge active power filter circuit that adopts the impedance coupling, this filter circuit comprises the bidirectional voltage boosting type power inverter that has power switch pipe, impedance network 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 power switch pipe (Sp2, Sn2) and each electric capacity (Cp, Cn), and at this inductance (L1, L2) and this power switch pipe (Sp2, Sn2) junction each again tap another power switch pipe (Sp1, Sn1) circuit constitutes; These two bidirectional voltage boosting type power inverters are cascaded by the 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 the AC side and the AC network (DW) of three-phase commutation bridge (ZLQ) by described impedance network, and 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.
2, the three phase rectifier bridge active power filter circuit of employing impedance coupling according to claim 1 is characterized in that described impedance network connects into wye connection by three impedances and constitutes, and the total current that flows to this impedance network is divided equally by three impedance branch roads.
3, the three phase rectifier bridge active power filter circuit of employing impedance coupling 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), 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, voltage sample circuit (PT1) with the positive-negative output end cross-over connection of described electrical network (DW) common port and three-phase commutation bridge (ZLQ), with with two current sensor (CT1, CT2) output, control that the output of two voltage sample circuits (PT and PT1) is connected and driver element (KZQDDY), the output of this control and driver element (KZQDDY) respectively with four power switch pipe (Sp1, Sp2, Sn1, Sn2) connect to be used to drive them.
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|---|---|---|---|
| CN 200610095395 CN1988339A (en) | 2006-12-31 | 2006-12-31 | Three phase rectifier bridge active power filter circuit using impedance coupling |
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|---|---|---|---|
| CN 200610095395 CN1988339A (en) | 2006-12-31 | 2006-12-31 | Three phase rectifier bridge active power filter circuit using impedance coupling |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130572A (en) * | 2011-04-28 | 2011-07-20 | 重庆大学 | Three-phase rectifier bridge direct-current side parallel connection type active power filter |
| CN102647083A (en) * | 2012-04-23 | 2012-08-22 | 淮海工学院 | Boost two-way voltage balance converter |
| CN103812314A (en) * | 2012-11-08 | 2014-05-21 | 上海儒竞电子科技有限公司 | High power factor three phase rectification circuit |
| CN108736481A (en) * | 2018-05-03 | 2018-11-02 | 南京航空航天大学 | A kind of aviation more electric engin AC/DC mixed power system and its design method |
-
2006
- 2006-12-31 CN CN 200610095395 patent/CN1988339A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130572A (en) * | 2011-04-28 | 2011-07-20 | 重庆大学 | Three-phase rectifier bridge direct-current side parallel connection type active power filter |
| CN102647083A (en) * | 2012-04-23 | 2012-08-22 | 淮海工学院 | Boost two-way voltage balance converter |
| CN103812314A (en) * | 2012-11-08 | 2014-05-21 | 上海儒竞电子科技有限公司 | High power factor three phase rectification circuit |
| CN108736481A (en) * | 2018-05-03 | 2018-11-02 | 南京航空航天大学 | A kind of aviation more electric engin AC/DC mixed power system and its design method |
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