CN102025161B - Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof - Google Patents

Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof Download PDF

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CN102025161B
CN102025161B CN2010105614162A CN201010561416A CN102025161B CN 102025161 B CN102025161 B CN 102025161B CN 2010105614162 A CN2010105614162 A CN 2010105614162A CN 201010561416 A CN201010561416 A CN 201010561416A CN 102025161 B CN102025161 B CN 102025161B
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power tube
brachium pontis
frequency
inductance
signal
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CN102025161A (en
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陈仲
陈淼
石磊
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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 provides a five-level dual-buck parallel active power filter (APF) and a dual-frequency half-wave control method thereof, belonging to the technical field of power harmonic suppression. The five-level dual-buck parallel APF comprises two same modules, wherein each module comprises a single power tube, a diode series bridge arm, a dual-power tube series bridge arm, an AC side parallel double inductor and a DC side capacitor. In the dual-frequency half-wave control method, current high-frequency half-wave control is adopted for the single power tube and the diode series bridge arm, and voltage low-frequency half-wave control is adopted for the dual-power tube series bridge arm. By using the five-level dual-buck parallel APF and the dual-frequency half-wave control method thereof, the system reliability can be improved, the tracking accuracy of compensating current is higher, and compensating effects are more ideal.

Description

Two step-down shunt active power filters of five level and double frequency half-wave control method thereof
Technical field
The present invention relates to two step-down shunt active power filters of a kind of five level and double frequency half-wave control method thereof, be applicable in high reliability request various, high-power using electricity system, belong to electric harmonic and suppress technical field.
Background technology
Because the application of power electronic equipment is increasingly extensive, make harmonic wave and idle problem cause the concern that People more and more is many.Simultaneously, also, also obtaining some breakthrough progress aspect harmonic wave inhibition and the reactive power compensation just because of the develop rapidly of power electronics.The power factor of the harmonic wave in the inhibition electrical network, raising device becomes the key subjects that research field faced such as power electronics and electric power system.
At present, an important trend of harmonic wave inhibition is to adopt Active Power Filter-APF.It is based on power electronic equipment; Can follow the tracks of compensation to the harmonic wave that frequency and amplitude all change, and compensation characteristic do not receive the influence of electric network impedance, both can be to a harmonic wave and reactive source separate compensation; Also can be to a plurality of harmonic waves and reactive source centralized compensation, thereby received widely and paid attention to.In all kinds of Active Power Filter-APF; Prevailing is parallel connection type active electric filter; Parallel connection type active electric filter has developed multiple topological mode up to now, and the basic composition unit mainly adopts the half-bridge or the full bridge structure of dual switch series connection.
Show according to existing research: possess good compensation characteristic in order to guarantee Active Power Filter-APF, be necessary to improve as far as possible switching frequency.But under high-power background, what switching device was at first faced is exactly the direct contradiction between power height and operating frequency size; Simultaneously, guarantee that the security reliability of high-power active power filtering system operation is also particularly important, for example in aviation power system, the reliability of active filter directly determines the reliability of aviation electric power system, and is very important to the safe operation of aircraft.
In order to alleviate the contradiction of switching device between power grade and switching frequency; Improve power electronic equipment to powerful disposal ability; People have carried out a large amount of exploratory developments to power electronic equipment and control device thereof, and its most representative scientific achievement is multiple technology, phase shift SPWM combined converter and five level current transformers etc.Its basic thought all is to adopt a plurality of same or similar modules (switching device) to be built into new power electronic equipment, and corresponding certain control device alleviates the power pressure of single switching device.
In order to guarantee the security reliability of high-power active power filtering system operation; Particularly under the high frequency situations; Often in control, make adjustment,, reduce switching frequency etc. as increasing Dead Time; It not only influences the compensation performance of Active Power Filter-APF, and does not fundamentally solve the potential problem of bridge arm direct pass.
Therefore; How under the prerequisite of the least possible increase cost; Neither lose the Active Power Filter-APF filtering characteristic; Can fundamentally solve active power filtering system safety reliability hidden danger again, through the improvement of the circuit topology of Active Power Filter-APF and control strategy is suppressed the purpose with reactive power compensation to reach harmonic wave, significant with application to the development of Active Power Filter-APF.
Summary of the invention
Technical problem to be solved of the present invention is to single-phase, the high-power electrical network of three-phase that exist electric energy to pollute; That realizes high reliable high-capacity humorously involves idle filtering function; Avoid insecure potential safety hazards such as bridge arm direct pass; Propose two step-down shunt active power filters of a kind of five level and double frequency half-wave control method thereof, the shunt active power filter compensation ability that overcomes half-bridge structure is not enough, effectively utilizes dc capacitor voltage; Reduce each power device electric pressure, and improve the harmonic compensation characteristic of Active Power Filter-APF.
The present invention adopts following technical scheme for realizing the foregoing invention purpose:
The two step-down shunt active power filters of a kind of five level comprise first module and second module, and said first module comprises first pair of inductance of AC side and at DC side first brachium pontis parallel with one another, second brachium pontis, the 3rd brachium pontis, first electric capacity; Said second module comprises second pair of inductance of AC side and at DC side the 4th brachium pontis parallel with one another, the 5th brachium pontis, the 6th brachium pontis, second electric capacity; Wherein,
Said first brachium pontis, second brachium pontis, the 4th brachium pontis, the 5th brachium pontis comprise single power tube and diode of mutual series connection respectively; Wherein in first brachium pontis, the 4th brachium pontis, the source electrode of single power tube is connected with the negative electrode of diode; In second brachium pontis, the 5th brachium pontis, the drain electrode of single power tube is connected with the anode of diode;
Said the 3rd brachium pontis, the 6th brachium pontis comprise two power tubes of series connection each other respectively, and the source electrode of wherein going up power tube is connected with the drain electrode of following power tube;
The mid point of said the 3rd brachium pontis is connected with the mid point of the 6th brachium pontis;
Said first pair of inductance, second pair of inductance are made up of two interconnective inductance respectively; Wherein two of first pair of inductance inductance are connected with the mid point of said first brachium pontis, second brachium pontis respectively; Two inductance of second pair of inductance are connected with the mid point of said the 4th brachium pontis, the 5th brachium pontis respectively;
The tie point of two inductance is connected with first bus, second bus of electrical network respectively in the tie point of two inductance in the first pair of inductance, the second pair of inductance.
Further, the two step-down shunt active power filters of aforesaid five level,
Said first brachium pontis comprises first power tube, first diode, and second brachium pontis comprises second power tube, second diode, and the 3rd brachium pontis comprises the 3rd power tube, the 4th power tube; Wherein,
One end of the drain electrode of the negative electrode of the drain electrode of first power tube, second diode, the 3rd power tube and first electric capacity is connected with first direct current positive bus respectively;
The other end of the source electrode of the source electrode of the anode of first diode, second power tube, the 4th power tube and first electric capacity is connected with the first direct current negative busbar respectively;
Said the 4th brachium pontis comprises the 5th power tube, the 3rd diode, and the 5th brachium pontis comprises the 6th power tube, the 4th diode, and the 6th brachium pontis comprises the 7th power tube, the 8th power tube; Wherein,
One end of the drain electrode of the negative electrode of the drain electrode of the 5th power tube, the 4th diode, the 7th power tube and second electric capacity is connected with second direct current positive bus respectively;
The other end of the source electrode of the source electrode of the anode of the 3rd diode, the 6th power tube, the 8th power tube and second electric capacity is connected with the second direct current negative busbar respectively.
First pair of inductance of AC side is made up of first inductance, second inductance; Wherein an end of first inductance is connected with first bus of electrical network with the continuous back of an end of second inductance; The other end of first inductance links to each other with source electrode and the negative electrode of first diode of first power tube in first brachium pontis respectively, and the other end of second inductance links to each other with drain electrode and the anode of second diode of second power tube in second brachium pontis respectively;
Second pair of inductance of AC side is made up of the 3rd inductance, the 4th inductance; Wherein an end of the 3rd inductance is connected with second bus of electrical network with the continuous back of an end of the 4th inductance; The source electrode of the 5th power tube and the negative electrode of the 3rd diode link to each other in the other end of the 3rd inductance and the 4th brachium pontis, and the drain electrode of the 6th power tube and the anode of the 4th diode link to each other in the other end of the 4th inductance and the 5th brachium pontis.
The drain electrode of the source electrode of the 3rd power tube, the 4th power tube is connected with the source electrode, the drain electrode of the 8th power tube of the 7th power tube in the 6th brachium pontis respectively in the 3rd brachium pontis, as the tie point of said first module and said second module.
The double frequency half-wave control method of the two step-down shunt active power filters of a kind of five level may further comprise the steps:
A adopts the existing humorous humorous reactive current that involves of idle detection method extraction that involves, as the reference signal of Current Control;
B detects compensating current signal, with its with the reference signal comparison after the overcurrent controller is exported modulation signal;
C; It is that two high frequency triangular carriers of 180 ° carry out the SPWM modulation with phase difference respectively that current controller is exported modulation signal; Obtain two groups of complementary high frequency SPWM control signals respectively, wherein first group of complementary high frequency SPWM control signal: first high-frequency controling signal, second high-frequency controling signal; Second group of complementary high frequency SPWM control signal: the 3rd high-frequency controling signal, the 4th high-frequency controling signal;
D adopts zero-crossing comparator that reference signal and 0 is compared, and obtains one group of complementary low frequency SPWM signal of corresponding reference signal positive-negative polarity: first low-frequency control signal, second low-frequency control signal;
E; First high-frequency controling signal, the 3rd high-frequency controling signal are obtained the high-frequency controling signal of power tube in high-frequency controling signal and the 5th brachium pontis of power tube in first brachium pontis respectively through logical AND gate with first low-frequency control signal; To guarantee offset current, only control the power tube of first brachium pontis and the power tube of the 5th brachium pontis less than 0 o'clock;
F; Second high-frequency controling signal, the 4th high-frequency controling signal are obtained the high-frequency controling signal of power tube of high-frequency controling signal and the 4th brachium pontis of the power tube of second brachium pontis respectively through logical AND gate with second low-frequency control signal; To guarantee offset current, only control the power tube of second brachium pontis and the power tube of the 4th brachium pontis greater than 0 o'clock;
G, detection of grid voltage adopts zero-crossing comparator that it is compared with 0, obtains the low frequency SPWM signal of one group of complementation of corresponding its positive-negative polarity: the first voltage low-frequency control signal and the second voltage low-frequency control signal;
With the first voltage low-frequency control signal respectively as the control signal of the B power tube of the A power tube of the 3rd brachium pontis, the 6th brachium pontis;
With the second voltage low-frequency control signal respectively as the control signal of the A power tube of the B power tube of the 3rd brachium pontis, the 6th brachium pontis;
When line voltage greater than 0 the time, the long A power tube of the 3rd brachium pontis, the B power tube of the 6th brachium pontis opened, the B power tube of closed the 3rd brachium pontis, the A power tube of the 6th brachium pontis; When line voltage less than 0 the time, aforesaid mode is changed;
H passes through corresponding drive circuit respectively with the control signal of the power tube in each brachium pontis and obtains corresponding drive signal.
The present invention also comprises the two step-down shunt active power filters of another kind of five level; Comprise first module and second module, said first module comprises first pair of inductance of AC side and at DC side first brachium pontis parallel with one another, second brachium pontis, the 3rd brachium pontis, first electric capacity; Said second module comprises second pair of inductance of AC side and at DC side the 4th brachium pontis parallel with one another, the 5th brachium pontis, the 6th brachium pontis, second electric capacity; Wherein,
Said first brachium pontis, second brachium pontis, the 4th brachium pontis, the 5th brachium pontis comprise single power tube and diode of mutual series connection respectively; Wherein in first brachium pontis, the 4th brachium pontis, the source electrode of single power tube is connected with the negative electrode of diode; In second brachium pontis, the 5th brachium pontis, the drain electrode of single power tube is connected with the anode of diode;
Said the 3rd brachium pontis, the 6th brachium pontis comprise two power tubes of series connection each other respectively, and the source electrode of wherein going up power tube is connected with the drain electrode of following power tube;
Said first pair of inductance, second pair of inductance are made up of two interconnective inductance respectively; Wherein two of first pair of inductance inductance are connected with the mid point of said first brachium pontis, second brachium pontis respectively; Two inductance of second pair of inductance are connected with the mid point of said the 4th brachium pontis, the 5th brachium pontis respectively;
The mid point of said the 3rd brachium pontis is connected with the tie point of two inductance in second pair of inductance; The mid point of the tie point of two inductance, the 6th brachium pontis is connected with two buses of electrical network respectively in said first pair of inductance.
Further, the two step-down shunt active power filters of aforesaid five level, said first brachium pontis comprises first power tube, first diode, and second brachium pontis comprises second power tube, second diode, and the 3rd brachium pontis comprises the 3rd power tube, the 4th power tube; Wherein,
One end of the drain electrode of the negative electrode of the drain electrode of first power tube, second diode, the 3rd power tube and first electric capacity is connected with first direct current positive bus respectively;
The other end of the source electrode of the source electrode of the anode of first diode, second power tube, the 4th power tube and first electric capacity is connected with the first direct current negative busbar respectively;
Said the 4th brachium pontis comprises the 5th power tube, the 3rd diode, and the 5th brachium pontis comprises the 6th power tube, the 4th diode, and the 6th brachium pontis comprises the 7th power tube, the 8th power tube; Wherein,
One end of the drain electrode of the negative electrode of the drain electrode of the 5th power tube, the 4th diode, the 7th power tube and second electric capacity is connected with second direct current positive bus respectively;
The other end of the source electrode of the source electrode of the anode of the 3rd diode, the 6th power tube, the 8th power tube and second electric capacity is connected with the second direct current negative busbar respectively.
First pair of inductance of AC side is made up of first inductance, second inductance; Wherein an end of first inductance is connected with first bus of electrical network with the continuous back of an end of second inductance; The other end of first inductance links to each other with source electrode and the negative electrode of first diode of first power tube in first brachium pontis respectively, and the other end of second inductance links to each other with drain electrode and the anode of second diode of second power tube in second brachium pontis respectively;
Second pair of inductance of AC side is made up of the 3rd inductance, the 4th inductance; Wherein an end of the 3rd inductance links to each other with an end of the 4th inductance; The other end of the 3rd inductance links to each other with source electrode and the negative electrode of the 3rd diode of the 5th power tube in the 4th brachium pontis respectively, and the other end of the 4th inductance links to each other with drain electrode and the anode of the 4th diode of the 6th power tube in the 5th brachium pontis respectively.
The drain electrode of the source electrode of the 3rd power tube, the 4th power tube is connected with the tie point of two inductance in second pair of inductance respectively in the 3rd brachium pontis, as the tie point of said first module and said second module;
The drain electrode of the source electrode of the 7th power tube, the 8th power tube is connected with second bus of electrical network respectively in the 6th brachium pontis.
The double frequency half-wave control method of the two step-down shunt active power filters of a kind of aforementioned five level may further comprise the steps:
Step a adopts the existing humorous humorous reactive current that involves of idle detection method extraction that involves, as the reference signal of Current Control;
Step b detects compensating current signal, with its with the reference signal comparison after the overcurrent controller is exported modulation signal;
Step c; It is that two high frequency triangular carriers of 180 ° carry out the SPWM modulation with phase difference respectively that current controller is exported modulation signal; Obtain two groups of complementary high frequency SPWM control signals respectively, wherein first group of complementary high frequency SPWM control signal: first high-frequency controling signal, second high-frequency controling signal; Second group of complementary high frequency SPWM control signal: the 3rd high-frequency controling signal, the 4th high-frequency controling signal;
Steps d adopts zero-crossing comparator that reference signal and 0 is compared, and obtains one group of complementary low frequency SPWM signal of corresponding reference signal positive-negative polarity: first low-frequency control signal, second low-frequency control signal;
Step e; First high-frequency controling signal, the 3rd high-frequency controling signal are obtained the high-frequency controling signal of power tube in high-frequency controling signal and the 4th brachium pontis of power tube in first brachium pontis respectively through logical AND gate with first low-frequency control signal; To guarantee offset current, only control the power tube of first brachium pontis and the power tube of the 4th brachium pontis less than 0 o'clock;
Step f; Second high-frequency controling signal, the 4th high-frequency controling signal are obtained the high-frequency controling signal of power tube of high-frequency controling signal and the 5th brachium pontis of the power tube of second brachium pontis respectively through logical AND gate with second low-frequency control signal; To guarantee offset current, only control the power tube of second brachium pontis and the power tube of the 5th brachium pontis greater than 0 o'clock;
Step g, detection of grid voltage adopts zero-crossing comparator that it is compared with 0, obtains the low frequency SPWM signal of one group of complementation of corresponding its positive-negative polarity: the first voltage low-frequency control signal and the second voltage low-frequency control signal;
With the first voltage low-frequency control signal respectively as the control signal of the A power tube of the A power tube of the 3rd brachium pontis, the 6th brachium pontis;
With the second voltage low-frequency control signal respectively as the control signal of the B power tube of the B power tube of the 3rd brachium pontis, the 6th brachium pontis;
When line voltage greater than 0 the time, the long A power tube of the 3rd brachium pontis, the A power tube of the 6th brachium pontis opened, the B power tube of closed the 3rd brachium pontis, the B power tube of the 6th brachium pontis; When line voltage less than 0 the time, aforesaid mode is changed;
Step h passes through corresponding drive circuit respectively with the control signal of the power tube in each brachium pontis and obtains corresponding drive signal.
The present invention adopts technique scheme to have following beneficial effect:
1, with respect to the conventional bridge Control Method of Active Power Filter, single power tube brachium pontis adopts high frequency control, and two power tube brachium pontis adopt low frequency control, can effectively reduce the danger of bridge arm direct pass, thereby improves the reliability of active power filtering system;
2, with respect to the conventional bridge Active Power Filter-APF, can optimize power switch pipe and power diode respectively, thereby reduce switching loss, create conditions for further improving switching frequency, so that improve filter harmonic compensation characteristic;
3, with respect to the half-bridge parallel connection type active electric filter, can utilize dc capacitor voltage fully, improve the compensation characteristic of active filter, can be applicable to big capacity occasion.
4, relative conventional bridge Active Power Filter-APF adopts bimodulus piece combining form structure, and the actual switch frequency is low relatively, and equivalent switching frequency is high, and switching loss is little, can be widely used in harmonic wave control single-phase or the three phase network system.
Description of drawings:
Fig. 1 is the parallel structural representations of of the present invention pair of step-down five level shunt active power filters.
Label among the figure: I-first module, II-second module, 1-the first direct current positive bus, 2-the first direct current negative busbar, 3-the second direct current positive bus, 4-the second direct current negative busbar.
Fig. 2 is the parallel double frequency half-wave control method figure of the two step-down five level shunt active power filters of correspondence of the present invention.
Fig. 3 is the control logic sequential chart and the brachium pontis mid point output voltage waveforms of the parallel double frequency half-wave of the present invention control method.
Fig. 4 is of the present invention pair of step-down five level shunt active power filter series-mode frame sketch mapes.
Fig. 5 is the tandem double frequency half-wave control method figure of the two step-down five level shunt active power filters of correspondence of the present invention.
Fig. 6 is the simulation waveform of the present invention's power network current, line voltage, load current and offset current of being applied to the 115V/400Hz electrical network.
Specific embodiments:
Below in conjunction with accompanying drawing the enforcement of technical scheme is done further to describe in detail:
Embodiment 1:
Accompanying drawing 1 is the parallel structural representations of of the present invention pair of step-down five level shunt active power filters.
A kind of pair of parallel structure of step-down five level shunt active power filters; Comprise the first module I and the second module II; Wherein, the first module I comprises first brachium pontis, second brachium pontis, the 3rd brachium pontis, DC side first electric capacity and the two inductance of AC side first parallel connection; Wherein, first brachium pontis is by the first power tube S 1The source electrode and the first diode D 1Negative electrode links to each other and forms; Second brachium pontis is by the second power tube S 2The drain electrode and the second diode D 2Anode links to each other and forms; The 3rd brachium pontis is by the 3rd power tube S 3Source electrode and the 4th power tube S 4Drain electrode links to each other and forms; The first power tube S in first brachium pontis 1The second diode D in drain electrode, second brachium pontis 2The 3rd power tube S in negative electrode, the 3rd brachium pontis 3The drain electrode and first capacitor C 1An end all insert first direct current positive bus 1; The first diode D in first brachium pontis 1The second power tube S in anode, second brachium pontis 2The 4th power tube S in source electrode, the 3rd brachium pontis 4The source electrode and first capacitor C 1The other end all insert the first direct current negative busbar 2; The two inductance of AC side first parallel connection are by first inductance L 1One end and second inductance L 2An end link to each other and to form first inductance L 1The first power tube S in the other end and first brachium pontis 1The source electrode and the first diode D 1Negative electrode links to each other, second inductance L 2The other end and second brachium pontis in the second power tube S 2The drain electrode and the second diode D 2Anode links to each other;
The said second module II comprises the 4th brachium pontis, the 5th brachium pontis, the 6th brachium pontis, DC side second electric capacity and the two inductance of AC side second parallel connection; Wherein, the 4th brachium pontis is by the 5th power tube S 5Source electrode and the 3rd diode D 3Negative electrode links to each other and forms; The 5th brachium pontis is by the 6th power tube S 6Drain electrode and the 4th diode D 4Anode links to each other and forms; The 6th brachium pontis is by the 7th power tube S 7Source electrode and the 8th power tube S 8Drain electrode links to each other and forms; The 5th power tube S in the 4th brachium pontis 5The 4th diode D in drain electrode, the 5th brachium pontis 4The 7th power tube S in negative electrode, the 6th brachium pontis 7The drain electrode and second capacitor C 2An end all insert second direct current positive bus 3; The 3rd diode D in the 4th brachium pontis 3The 6th power tube S in anode, the 5th brachium pontis 6The 8th power tube S in source electrode, the 6th brachium pontis 8The source electrode and second capacitor C 2The other end all insert the second direct current negative busbar 4; The two inductance of AC side second parallel connection are by the 3rd inductance L 3One end and the 4th inductance L 4An end link to each other and to form the 3rd inductance L 3The 5th power tube S in the other end and the 4th brachium pontis 5Source electrode and the 3rd diode D 3Negative electrode links to each other, the 4th inductance L 4The other end and the 5th brachium pontis in the 6th power tube S 6Drain electrode and the 4th diode D 4Anode links to each other;
The 3rd power tube S in the 3rd brachium pontis 3Source electrode, the 4th power tube S 4The 7th power tube S in drain electrode and the 6th brachium pontis 7Source electrode, the 8th power tube S 8Drain electrode all links to each other, as the first module I and the second module II tie point; First inductance L 1With second inductance L 2Tie point, the 3rd inductance L 3With the 4th inductance L 4Tie point respectively as tie point A, the N of Active Power Filter-APF and electrical network;
Fig. 2 is the double frequency half-wave control method figure of two step-downs five level shunt active power filters of the corresponding parallel structure shown in Figure 1 of the present invention, may further comprise the steps:
Utilize the existing humorous humorous reactive current that involves of idle detection technique extraction that involves, as the reference signal of Current Control;
Detect compensating current signal , with its with reference signal comparison after overcurrent controller P exports modulation signal;
With current controller P output modulation signal is that two high frequency triangular carriers of 180 ° carry out the SPWM modulation with phase difference respectively, obtains two groups of complementary high frequency SPWM control signal X 1With X 2, Y 1With Y 2
With reference signal With 0 compare, obtain corresponding One group of complementary low frequency SPWM signal Z of positive-negative polarity 1With Z 2
With control signal X 1, Y 1Respectively with Z 1Obtain the first power tube S through logical AND gate 1With the 6th power tube S 6Control signal A 1, A 6, to guarantee offset current Less than 0 o'clock, only control the first power tube S of first brachium pontis 1The 6th power tube S with the 5th brachium pontis 6
With control signal X 2, Y 2Respectively with Z 2Obtain the second power tube S through logical AND gate 2With the 5th power tube S 6Control signal A 2, A 5, to guarantee offset current Greater than 0 o'clock, only control the second power tube S of second brachium pontis 2The 5th power tube S with the 4th brachium pontis 5
Detection of grid voltage , with it and 0 compare, obtain one group of complementary low frequency SPWM signal W of corresponding its positive-negative polarity 1With W 2, promptly be respectively the 3rd, eight power tube S of the 3rd brachium pontis and the 6th brachium pontis 3, S 8With the 4th, seven power tube S 4, S 7Control signal; Line voltage was greater than 0 o'clock, and length is opened the 3rd, eight power tube S 3, S 8, closed the 4th, seven power tube S 4, S 7Otherwise, long the 4th, the seven power tube S that open 4, S 7, closed the 3rd, eight power tube S 3, S 8
With high-frequency controling signal A 1, A 2, A 6, A 5With low-frequency control signal W 1, W 2Obtain the first power tube S through corresponding drive circuit respectively 1, the second power tube S 2, the 6th power tube S 6, the 5th power tube S 5, the 3rd power tube S 3With the 8th power tube S 8, the 4th power tube S 4With the 7th power tube S 7Drive signal;
Fig. 3 is the control logic sequential chart and the brachium pontis mid point output voltage waveforms of the parallel double frequency half-wave of the present invention control method.
Embodiment 2:
Fig. 4 is of the present invention pair of step-down five level shunt active power filter series-mode frame sketch mapes.
The two step-down shunt active power filter series-mode frames of a kind of five level; Comprise the first module I and the second module II, itself and different only being of the two parallel structures of step-down shunt active power filter of five level: the type of attachment of the first module I and the second module II and the tie point of Active Power Filter-APF and electrical network;
The 3rd power tube S in the 3rd brachium pontis 3Source electrode, the 4th power tube S 4The 3rd inductance L in parallelly connected two inductance with second drains 3With the 4th inductance L 4Tie point all link to each other, as the first module I and the second module II tie point; First inductance L 1With second inductance L 2Tie point, the 6th brachium pontis in the 7th power tube S 7Source electrode and the 8th power tube S 8The tie point of drain electrode is respectively as tie point A, the N of Active Power Filter-APF and electrical network;
Fig. 5 is the double frequency half-wave control method figure of two step-downs five level shunt active power filters of the corresponding series-mode frame shown in Figure 4 of the present invention.
Tandem double frequency half-wave control method only is with the different of parallel control method shown in Figure 2: the power tube order that drive signal is corresponding;
With high-frequency controling signal A 1, A 2, A 5, A 6With low-frequency control signal W 1, W 2Obtain the first power tube S through corresponding drive circuit respectively 1, the second power tube S 2, the 5th power tube S 5, the 6th power tube S 6, the 3rd power tube S 3With the 7th power tube S 7, the 4th power tube S 4With the 8th power tube S 8Drive signal;
Under the MATLAB software environment, the present invention has been set up simulation model, and carried out waveform analysis.Fig. 6 is the simulation waveform of the present invention's power network current, line voltage, load current and offset current of being applied to the 115V/400Hz electrical network.Find that through emulation circuit topology of the present invention has good harmonic compensation characteristic; Power network current does not contain harmonic wave and idle component after overcompensation; Power network current THD is about 1%; Simulation result shows: the present invention can better realize power network harmonic wave management, has improved the operational reliability of active power filtering system.
The foregoing description is used for the present invention that explains, rather than limits the invention, and in the protection range of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (4)

1. two step-down shunt active power filters of a level; It is characterized in that: comprise first module (I) and second module (II), said first module (I) comprises first pair of inductance of AC side and at DC side first brachium pontis parallel with one another, second brachium pontis, the 3rd brachium pontis, first electric capacity; Said second module (II) comprises second pair of inductance of AC side and at DC side the 4th brachium pontis parallel with one another, the 5th brachium pontis, the 6th brachium pontis, second electric capacity; Wherein,
Said first brachium pontis comprises the first power tube (S 1), the first diode (D 1), second brachium pontis comprises the second power tube (S 2), the second diode (D 2), the 3rd brachium pontis comprises the 3rd power tube (S 3), the 4th power tube (S 4); Wherein,
First power tube (the S 1) drain electrode, the second diode (D 2) negative electrode, the 3rd power tube (S 3) the drain electrode and the first electric capacity (C 1) an end be connected with first direct current positive bus (1) respectively;
First diode (the D 1) anode, the second power tube (S 2) source electrode, the 4th power tube (S 4) the source electrode and the first electric capacity (C 1) the other end be connected with the first direct current negative busbar (2) respectively;
Said the 4th brachium pontis comprises the 5th power tube (S 5), the 3rd diode (D 3), the 5th brachium pontis comprises the 6th power tube (S 6), the 4th diode (D 4), the 6th brachium pontis comprises the 7th power tube (S 7), the 8th power tube (S 8); Wherein,
The 5th power tube (S 5) drain electrode, the 4th diode (D 4) negative electrode, the 7th power tube (S 7) the drain electrode and the second electric capacity (C 2) an end be connected with second direct current positive bus (3) respectively;
The 3rd diode (D 3) anode, the 6th power tube (S 6) source electrode, the 8th power tube (S 8) the source electrode and the second electric capacity (C 2) the other end be connected with the second direct current negative busbar (4) respectively;
First pair of inductance of AC side is by the first inductance (L 1), the second inductance (L 2) composition, the wherein first inductance (L 1) an end and the second inductance (L 2) the end back that links to each other be connected the first inductance (L with first bus of electrical network 1) the other end respectively with first brachium pontis in the first power tube (S 1) the source electrode and the first diode (D 1) negative electrode link to each other the second inductance (L 2) the other end respectively with second brachium pontis in the second power tube (S 2) the drain electrode and the second diode (D 2) anode link to each other;
Second pair of inductance of AC side is by the 3rd inductance (L 3), the 4th inductance (L 4) composition, wherein the 3rd inductance (L 3) an end and the 4th inductance (L 4) the end back that links to each other be connected the 3rd inductance (L with second bus of electrical network 3) the other end and the 4th brachium pontis in the 5th power tube (S 5) source electrode and the 3rd diode (D 3) negative electrode link to each other the 4th inductance (L 4) the other end and the 5th brachium pontis in the 6th power tube (S 6) drain electrode and the 4th diode (D 4) anode link to each other;
The 3rd power tube (S in the 3rd brachium pontis 3) source electrode, the 4th power tube (S 4) drain electrode respectively with the 6th brachium pontis in the 7th power tube (S 7) source electrode, the 8th power tube (S 8) drain electrode be connected, as the tie point of said first module (I) and said second module (II).
2. the double frequency half-wave control method based on the two step-down shunt active power filters of described five level of claim 1 is characterized in that, may further comprise the steps:
A adopts the existing humorous humorous reference signal that involves reactive current as Current Control of idle detection method extraction that involves;
B detects compensating current signal (i C), with itself and reference signal Comparison is after overcurrent controller (P) output modulation signal;
C; With current controller (P) output modulation signal is that two high frequency triangular carriers of 180 ° carry out the SPWM modulation with phase difference respectively; Obtain two groups of complementary high frequency SPWM control signals respectively, wherein first group of complementary high frequency SPWM control signal: the first high-frequency controling signal (X 1), the second high-frequency controling signal (X 2); Second group of complementary high frequency SPWM control signal: the 3rd high-frequency controling signal (Y 1), the 4th high-frequency controling signal (Y 2);
D adopts zero-crossing comparator with reference signal With 0 compare, obtain corresponding reference signal One group of complementary low frequency SPWM signal of positive-negative polarity: the first low-frequency control signal (Z 1), the second low-frequency control signal (Z 2);
E is with the first high-frequency controling signal (X 1), the 3rd high-frequency controling signal (Y 1) respectively with the first low-frequency control signal (Z 1) obtain the high-frequency controling signal (A of power tube in first brachium pontis through logical AND gate 1) and the 5th brachium pontis in the high-frequency controling signal (A of power tube 6), to guarantee offset current (i C) less than 0 o'clock, only control the power tube of first brachium pontis and the power tube of the 5th brachium pontis;
F is with the second high-frequency controling signal (X 2), the 4th high-frequency controling signal (Y 2) respectively with the second low-frequency control signal (Z 2) obtain the high-frequency controling signal (A of the power tube of second brachium pontis through logical AND gate 2) and the high-frequency controling signal (A of the power tube of the 4th brachium pontis 5), to guarantee offset current (i C) greater than 0 o'clock, only control the power tube of second brachium pontis and the power tube of the 4th brachium pontis;
G, detection of grid voltage (u S), adopt zero-crossing comparator that it is compared with 0, obtain the low frequency SPWM signal of one group of complementation of corresponding its positive-negative polarity: the first voltage low-frequency control signal (W 1) and the second voltage low-frequency control signal (W 2);
With the first voltage low-frequency control signal (W 1) respectively as the 3rd power tube (S of the 3rd brachium pontis 3), the 8th power tube (S of the 6th brachium pontis 8) control signal;
With the second voltage low-frequency control signal (W 2) respectively as the 4th power tube (S of the 3rd brachium pontis 4), the 7th power tube (S of the 6th brachium pontis 7) control signal;
When line voltage greater than 0 the time, long the 3rd power tube (S that opens the 3rd brachium pontis 3), the 8th power tube (S of the 6th brachium pontis 8), the 4th power tube (S of closed the 3rd brachium pontis 4), the 7th power tube (S of the 6th brachium pontis 7); When line voltage less than 0 the time, the 3rd power tube (S of closed the 3rd brachium pontis 3), the 8th power tube (S of the 6th brachium pontis 8), long the 4th power tube (S that opens the 3rd brachium pontis 4), the 7th power tube (S of the 6th brachium pontis 7);
H passes through corresponding drive circuit respectively with the control signal of the power tube in each brachium pontis and obtains corresponding drive signal.
3. two step-down shunt active power filters of a level; It is characterized in that: comprise first module (I) and second module (II), said first module (I) comprises first pair of inductance of AC side and at DC side first brachium pontis parallel with one another, second brachium pontis, the 3rd brachium pontis, first electric capacity; Said second module (II) comprises second pair of inductance of AC side and at DC side the 4th brachium pontis parallel with one another, the 5th brachium pontis, the 6th brachium pontis, second electric capacity; Wherein,
Said first brachium pontis comprises the first power tube (S 1), the first diode (D 1), second brachium pontis comprises the second power tube (S 2), the second diode (D 2), the 3rd brachium pontis comprises the 3rd power tube (S 3), the 4th power tube (S 4); Wherein,
First power tube (the S 1) drain electrode, the second diode (D 2) negative electrode, the 3rd power tube (S 3) the drain electrode and the first electric capacity (C 1) an end be connected with first direct current positive bus (1) respectively;
First diode (the D 1) anode, the second power tube (S 2) source electrode, the 4th power tube (S 4) the source electrode and the first electric capacity (C 1) the other end be connected with the first direct current negative busbar (2) respectively;
Said the 4th brachium pontis comprises the 5th power tube (S 5), the 3rd diode (D 3), the 5th brachium pontis comprises the 6th power tube (S 6), the 4th diode (D 4), the 6th brachium pontis comprises the 7th power tube (S 7), the 8th power tube (S 8); Wherein,
The 5th power tube (S 5) drain electrode, the 4th diode (D 4) negative electrode, the 7th power tube (S 7) the drain electrode and the second electric capacity (C 2) an end be connected with second direct current positive bus (3) respectively;
The 3rd diode (D 3) anode, the 6th power tube (S 6) source electrode, the 8th power tube (S 8) the source electrode and the second electric capacity (C 2) the other end be connected with the second direct current negative busbar (4) respectively;
First pair of inductance of AC side is by the first inductance (L 1), the second inductance (L 2) composition, the wherein first inductance (L 1) an end and the second inductance (L 2) the end back that links to each other be connected the first inductance (L with first bus of electrical network 1) the other end respectively with first brachium pontis in the first power tube (S 1) the source electrode and the first diode (D 1) negative electrode link to each other the second inductance (L 2) the other end respectively with second brachium pontis in the second power tube (S 2) the drain electrode and the second diode (D 2) anode link to each other;
Second pair of inductance of AC side is by the 3rd inductance (L 3), the 4th inductance (L 4) composition, wherein the 3rd inductance (L 3) an end and the 4th inductance (L 4) an end link to each other the 3rd inductance (L 3) the other end respectively with the 4th brachium pontis in the 5th power tube (S 5) source electrode and the 3rd diode (D 3) negative electrode link to each other the 4th inductance (L 4) the other end respectively with the 5th brachium pontis in the 6th power tube (S 6) drain electrode and the 4th diode (D 4) anode link to each other;
The 3rd power tube (S in the 3rd brachium pontis 3) source electrode, the 4th power tube (S 4) drain electrode be connected with the tie point of two inductance in second pair of inductance respectively, as the tie point of said first module (I) and said second module (II);
The 7th power tube (S in the 6th brachium pontis 7) source electrode, the 8th power tube (S 8) drain electrode be connected with second bus of electrical network respectively.
4. the double frequency half-wave control method based on the two step-down shunt active power filters of described five level of claim 3 is characterized in that, may further comprise the steps:
Step a adopts the existing humorous humorous reference signal that involves reactive current as Current Control of idle detection method extraction that involves;
Step b detects compensating current signal (i C), with itself and reference signal Comparison is after overcurrent controller (P) output modulation signal;
Step c; With current controller (P) output modulation signal is that two high frequency triangular carriers of 180 ° carry out the SPWM modulation with phase difference respectively; Obtain two groups of complementary high frequency SPWM control signals respectively, wherein first group of complementary high frequency SPWM control signal: the first high-frequency controling signal (X 1), the second high-frequency controling signal (X 2); Second group of complementary high frequency SPWM control signal: the 3rd high-frequency controling signal (Y 1), the 4th high-frequency controling signal (Y 2);
Steps d adopts zero-crossing comparator with reference signal With 0 compare, obtain corresponding reference signal One group of complementary low frequency SPWM signal of positive-negative polarity: the first low-frequency control signal (Z 1), the second low-frequency control signal (Z 2);
Step e is with the first high-frequency controling signal (X 1), the 3rd high-frequency controling signal (Y 1) respectively with the first low-frequency control signal (Z 1) obtain the high-frequency controling signal (A of power tube in first brachium pontis through logical AND gate 1) and the 4th brachium pontis in the high-frequency controling signal (A of power tube 5), to guarantee offset current (i C) less than 0 o'clock, only control the power tube of first brachium pontis and the power tube of the 4th brachium pontis;
Step f is with the second high-frequency controling signal (X 2), the 4th high-frequency controling signal (Y 2) respectively with the second low-frequency control signal (Z 2) obtain the high-frequency controling signal (A of the power tube of second brachium pontis through logical AND gate 2) and the high-frequency controling signal (A of the power tube of the 5th brachium pontis 6), to guarantee offset current (i C) greater than 0 o'clock, only control the power tube of second brachium pontis and the power tube of the 5th brachium pontis;
Step g, detection of grid voltage (u S), adopt zero-crossing comparator that it is compared with 0, obtain the low frequency SPWM signal of one group of complementation of corresponding its positive-negative polarity: the first voltage low-frequency control signal (W 1) and the second voltage low-frequency control signal (W 2);
With the first voltage low-frequency control signal (W 1) respectively as the 3rd power tube (S of the 3rd brachium pontis 3), the 7th power tube (S of the 6th brachium pontis 7) control signal;
With the second voltage low-frequency control signal (W 2) respectively as the 4th power tube (S of the 3rd brachium pontis 4), the 8th power tube (S of the 6th brachium pontis 8) control signal;
When line voltage greater than 0 the time, long the 3rd power tube (S that opens the 3rd brachium pontis 3), the 7th power tube (S of the 6th brachium pontis 7), the 4th power tube (S of closed the 3rd brachium pontis 4), the 8th power tube (S of the 6th brachium pontis 8); When line voltage less than 0 the time, the 3rd power tube (S of closed the 3rd brachium pontis 3), the 7th power tube (S of the 6th brachium pontis 7), long the 4th power tube (S that opens the 3rd brachium pontis 4), the 8th power tube (S of the 6th brachium pontis 8);
Step h passes through corresponding drive circuit respectively with the control signal of the power tube in each brachium pontis and obtains corresponding drive signal.
CN2010105614162A 2010-11-27 2010-11-27 Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof Expired - Fee Related CN102025161B (en)

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