CN101938127A - Single-phase and three-phase dual buck full-bridge parallel active power filter - Google Patents

Single-phase and three-phase dual buck full-bridge parallel active power filter Download PDF

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Publication number
CN101938127A
CN101938127A CN201010255222XA CN201010255222A CN101938127A CN 101938127 A CN101938127 A CN 101938127A CN 201010255222X A CN201010255222X A CN 201010255222XA CN 201010255222 A CN201010255222 A CN 201010255222A CN 101938127 A CN101938127 A CN 101938127A
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phase
inductance
brachium pontis
filter
power tube
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CN101938127B (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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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]

Abstract

The invention provides a single-phase and three-phase dual buck full-bridge parallel active power filter, belonging to the technical field of electric power harmonic suppression. The single-phase and three-phase dual buck full-bridge parallel active power filter comprises two structures suitable for a single-phase power grid system and a three-phase four-wire system grid system. The invention comprises a bridge arm, an AC side parallel dual inductance and a DC side capacitance, wherein the bridge arm is composed of a single power tube and a diode. The invention has simple circuit structure, is easy to realize control and driving and has excellent filter performance. Because of the special structure of the bridge arm of the single-power tube, the invention can avoid the direct connection problem of the bridge arm and improves the working reliability of an active filter. The invention can be widely used for the harmonic wave treatment of a power grid with high requirement on system reliability and large volume, such as aviation, aerospace, medical establishment, high-precision instrument manufacture and the like.

Description

Single-phase, three-phase double step-down full bridge parallel connection type active electric filter
Technical field:
The present invention relates to a kind of single-phase, three-phase double step-down full bridge parallel connection type active electric filter, be applicable in high reliability request various, high-power using electricity system, belong to electric harmonic and suppress technical field.
Background technology:
In distribution system and power distribution network, the problem that the use of a large amount of nonlinear loads makes that electrical network exists voltage flicker, fluctuation, floats frequently, three-phase imbalance, harmonic wave etc. influence the quality of power supply and efficient, especially with Switching Power Supply and AC speed regulating equipment a large amount of uses of the various power electronic equipments of representative, other users are produced disturbance, threaten the safe operation of electrical network and power consumption equipment, make that reactive power and harmonic compensation become the problem that presses for solution in the electric power system.
Many experts and scholar are researching and developing the problem that the dynamic adjustable device solves the quality of power supply always, and what wherein have the meaning represented is Active Power Filter-APF, have begun to be extensive use of on industry and civil equipment Active Power Filter-APF in the world.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, the basic composition unit mainly adopts the half-bridge or the full bridge structure of dual switch series connection, switching tube may cause the problem of bridge arm direct pass when HF switch is worked, influence the stability and the reliability of system, increasing the switch dead band simultaneously also can influence the filtering characteristic of Active Power Filter-APF, and it is difficult to be used widely in the network system of high reliability request.Simultaneously, for the active filter of half-bridge structure, its dc capacitor voltage utilance only is half of full bridge structure active filter, and there is very big influence in this compensation characteristic to Active Power Filter-APF.Therefore, how when not losing the Active Power Filter-APF filtering characteristic, to improve its reliability, by to the improvement of the circuit topology of Active Power Filter-APF and control strategy to reach harmonic wave and suppress and the purpose of reactive power compensation, significant to the development of Active Power Filter-APF with application.
Summary of the invention
Goal of the invention:
The big capacity network system that the objective of the invention is to high reliability request is that object is at the deficiencies in the prior art, a kind of single-phase, three-phase double step-down full bridge parallel connection type active electric filter is proposed, by power tube and diode are composed in series bridge arm unit, stop the danger of bridge arm direct pass fully, and can overcome the shunt active power filter compensation ability deficiency of half-bridge structure, effectively utilize dc capacitor voltage, improve the harmonic compensation characteristic of Active Power Filter-APF.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
A kind of single-phase double step-down full bridge parallel connection type active electric filter, described Active Power Filter-APF is connected with the positive and negative busbar of AC network, also comprises filter inductance, nonlinear load between the positive and negative busbar of described AC network; Described AC network, nonlinear load are respectively single phase poaer supply and single-phase load, wherein the positive output end of Active Power Filter-APF is connected with the positive bus-bar of AC network, the input of filter inductance respectively, the output of filter inductance is connected with the input of nonlinear load, and the output of nonlinear load connects the negative output terminal of Active Power Filter-APF, the negative busbar of AC network respectively;
Described Active Power Filter-APF comprises filter main circuit, voltage and current detecting device, FILTER TO CONTROL and drive circuit; Wherein the dc bus of the positive output end of the output of the input of the positive and negative busbar of AC network, filter inductance, nonlinear load, filter main circuit, filter main circuit is connected with the input of voltage and current detecting device respectively, the output of voltage and current detecting device is connected with the input of FILTER TO CONTROL and drive circuit, and the output of FILTER TO CONTROL and drive circuit is connected with the input of filter main circuit;
Described filter main circuit comprises AC side inductance in parallel, first single power tube brachium pontis, second single power tube brachium pontis and the dc bus capacitor; Wherein, described AC side inductance in parallel comprises first inductance L 1, second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4Described first single power tube brachium pontis, second single power tube brachium pontis comprise the brachium pontis of two parallel connections respectively; First inductance L wherein 1An end, second inductance L 2An end link to each other as the positive output end of filter main circuit, first inductance L 1The other end and first single power tube brachium pontis in the mid point of arbitrary brachium pontis link to each other second inductance L 2The other end link to each other with the mid point of arbitrary brachium pontis in second single power tube brachium pontis; The 3rd inductance L 3An end, the 4th inductance L 4An end link to each other as the negative output terminal of filter main circuit, the 3rd inductance L 3The other end and first single power tube brachium pontis in the mid point of another brachium pontis link to each other the 4th inductance L 4The other end and second single power tube brachium pontis in the mid point of another brachium pontis link to each other;
The two ends of described dc bus capacitor connect the positive and negative dc bus of filter main circuit respectively.
Further, each brachium pontis in first of above-mentioned single-phase double step-down full bridge parallel connection type active electric filter single power tube brachium pontis, the second single power tube brachium pontis all comprises a metal-oxide-semiconductor and a diode respectively.
Further, first brachium pontis of first of above-mentioned single-phase double step-down full bridge parallel connection type active electric filter single power tube brachium pontis comprises the first metal-oxide-semiconductor S 1, the first diode D 1, second brachium pontis comprises the 3rd metal-oxide-semiconductor S 3, the 3rd diode D 3The first metal-oxide-semiconductor S wherein 1The source electrode and the first diode D 1Negative electrode link to each other the 3rd metal-oxide-semiconductor S 3Source electrode and the 3rd diode D 3Negative electrode link to each other;
First brachium pontis of described second single power tube brachium pontis comprises the second metal-oxide-semiconductor S 2, the second diode D 2, second brachium pontis comprises the 4th metal-oxide-semiconductor S 4, the 4th diode D 4The second metal-oxide-semiconductor S wherein 2The drain electrode and the second diode D 2Anode connect the 4th metal-oxide-semiconductor S 4Drain electrode and the 4th diode D 4Anode connect;
The first metal-oxide-semiconductor S 1, the 3rd metal-oxide-semiconductor S 3Drain electrode, the second diode D 2Negative electrode, the 4th diode D 4Negative electrode be connected the second metal-oxide-semiconductor S respectively with the direct current positive bus of filter main circuit 2Source electrode, the 4th metal-oxide-semiconductor S 4Source electrode, the first diode D 1, the 3rd diode D 3Anode be connected with the direct current negative busbar of filter main circuit respectively.
Further, the voltage and current detecting device of above-mentioned single-phase double step-down full bridge parallel connection type active electric filter comprises n voltage sensor and m current sensor, and wherein n, m are positive integer; Described FILTER TO CONTROL and drive circuit comprise harmonic wave detection calculations circuit, PWM current control circuit and the drive circuit that order links to each other.
Further, the sense of each inductance in the AC side inductance in parallel of above-mentioned single-phase double step-down full bridge parallel connection type active electric filter value is identical, wherein first inductance L 1With second inductance L 2, the 3rd inductance L 3With the 4th inductance L 4The mode of incoming transport electrical network can be exchanged, and the connected mode of first single power tube brachium pontis, second single power tube brachium pontis and AC side inductance in parallel can be exchanged.
A kind of three-phase double step-down full bridge parallel connection type active electric filter, described Active Power Filter-APF is connected with the bus of AC network, and described AC network is a three phase mains, and the bus of described AC network is connected with three-phase filter inductance, threephase load respectively; Wherein the output of Active Power Filter-APF is connected with the bus of three phase mains, the input of three-phase filter inductance respectively, and the output of three-phase filter inductance is connected with threephase load; Described Active Power Filter-APF comprises filter main circuit, voltage and current detecting device, FILTER TO CONTROL and drive circuit; Wherein the dc bus of the output of the input of the bus of three phase mains, three-phase filter inductance, active filter main circuit, active filter main circuit is connected with the input of voltage and current detecting device respectively, the output of voltage and current detecting device is connected with the input of FILTER TO CONTROL and drive circuit, and the output of FILTER TO CONTROL and drive circuit is connected with the input of filter main circuit;
Described filter main circuit comprises AC side inductance in parallel, first single power tube brachium pontis, second single power tube brachium pontis and the dc bus capacitor;
Wherein, described AC side inductance in parallel comprises an A phase inductance L 1A, the 2nd A phase inductance L 2A, a B phase inductance L 1B, the 2nd B phase inductance L 2B, a C phase inductance L 1C, the 2nd C phase inductance L 2CDescribed first single power tube brachium pontis, second single power tube brachium pontis comprise the brachium pontis of three parallel connections respectively; An A phase inductance L wherein 1A, the 2nd A phase inductance L 2AAn end link to each other as the A phase output terminal of filter main circuit, the A of A phase output terminal and described three phase mains bus mutually links to each other; The one A phase inductance L 1AThe other end link to each other the 2nd A phase inductance L with the mid point of first brachium pontis in first single power tube brachium pontis 2AThe other end link to each other with the mid point of first brachium pontis in second single power tube brachium pontis;
A described B phase inductance L 1B, the 2nd B phase inductance L 2BAn end link to each other as the B phase output terminal of filter main circuit, the B of B phase output terminal and described three phase mains bus mutually links to each other; The one B phase inductance L 1BThe other end link to each other the 2nd B phase inductance L with the mid point of second brachium pontis in first single power tube brachium pontis 2BThe other end link to each other with the mid point of second brachium pontis in second single power tube brachium pontis;
A described C phase inductance L 1C, the 2nd C phase inductance L 2CAn end link to each other as the C phase output terminal of filter main circuit, the C of C phase output terminal and described three phase mains bus mutually links to each other; The one C phase inductance L 1CThe other end link to each other the 2nd C phase inductance L with the mid point of the 3rd brachium pontis in first single power tube brachium pontis 2CThe other end link to each other with the mid point of the 3rd brachium pontis in second single power tube brachium pontis;
The two ends of described dc bus capacitor connect the positive and negative dc bus of filter main circuit respectively.
Further, each brachium pontis in first of above-mentioned three-phase double step-down full bridge parallel connection type active electric filter single power tube brachium pontis, the second single power tube brachium pontis all comprises a metal-oxide-semiconductor and a diode respectively.
Further, first brachium pontis of first single power tube brachium pontis of above-mentioned three-phase double step-down full bridge parallel connection type active electric filter comprises an A phase metal-oxide-semiconductor S 1A, an A diode phase D 1A: second brachium pontis of first single power tube brachium pontis comprises a B phase metal-oxide-semiconductor S 1B, a B diode phase D 1BThe 3rd brachium pontis of first single power tube brachium pontis comprises a C phase metal-oxide-semiconductor S 1C, a C diode phase D 1CAn A phase metal-oxide-semiconductor S wherein 1AA source electrode and an A diode phase D 1ANegative electrode link to each other a B phase metal-oxide-semiconductor S 1BA source electrode and a B diode phase D 1BNegative electrode link to each other a C phase metal-oxide-semiconductor S 1CA source electrode and a C diode phase D 1CNegative electrode link to each other;
First brachium pontis of described second single power tube brachium pontis comprises the 2nd A phase metal-oxide-semiconductor S 2A, the 2nd A diode phase D 2A, second brachium pontis of second single power tube brachium pontis comprises the 2nd B phase metal-oxide-semiconductor S 2B, the 2nd B diode phase D 2B, the 3rd brachium pontis of second single power tube brachium pontis comprises the 2nd C phase metal-oxide-semiconductor S 2C, the 2nd C diode phase D 2C, the 2nd A phase metal-oxide-semiconductor S wherein 2ADrain electrode and the 2nd A diode phase D 2AAnode connect the 2nd B phase metal-oxide-semiconductor S 2BDrain electrode and the 2nd B diode phase D 2BAnode connect the 2nd C phase metal-oxide-semiconductor S 2CDrain electrode and the 2nd C diode phase D 2CAnode connect;
A described A phase metal-oxide-semiconductor S 1ADrain electrode, a B phase metal-oxide-semiconductor S 1BDrain electrode, a C phase metal-oxide-semiconductor S 1CDrain electrode, the 2nd A diode phase D 2ANegative electrode, the 2nd B diode phase D 2BNegative electrode, the 2nd C diode phase D 2CNegative electrode be connected described the 2nd A phase metal-oxide-semiconductor S respectively with the direct current positive bus of filter main circuit 2ASource electrode, the 2nd B phase metal-oxide-semiconductor S 2BSource electrode, the 2nd C phase metal-oxide-semiconductor S 2CSource electrode, an A diode phase D 1AAnode, a B diode phase D 1BAnode, a C diode phase D 1CAnode be connected with the direct current negative busbar of filter main circuit respectively.
Further, the voltage and current detecting device of above-mentioned three-phase double step-down full bridge parallel connection type active electric filter comprises n voltage sensor and m current sensor, and wherein n, m are positive integer; Described FILTER TO CONTROL and drive circuit comprise harmonic wave detection calculations circuit, PWM current control circuit and the drive circuit that order links to each other.
Further, the sense of each inductance in the AC side inductance in parallel of above-mentioned three-phase double step-down full bridge parallel connection type active electric filter value is identical, wherein an A phase inductance L 1AWith the 2nd A phase inductance L 2A, a B phase inductance L 1BWith the 2nd B phase inductance L 2B, a C phase inductance L 1CWith the 2nd C phase inductance L 2CThe mode of incoming transport electrical network can be exchanged; The connected mode of first single power tube brachium pontis, second single power tube brachium pontis and AC side inductance in parallel can be exchanged.
Beneficial effect:
1, with respect to traditional parallel connection type active electric filter, the danger that when guaranteeing good harmonic compensation characteristic, can stop bridge arm direct pass, thereby the reliability of raising active power filtering system;
2, with respect to traditional parallel connection type active electric filter, 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, can be widely used in the harmonic wave control of single-phase network system and three-phase three-wire system network system.
Description of drawings:
Fig. 1 is a single-phase double step-down full bridge parallel connection type active electric filter structural representation of the present invention.
Number in the figure: 1-AC network, 2-filter inductance, 3-load, 4-filter main circuit, 5-AC side two inductance in parallel, the single power tube brachium pontis of 6-, 7-AC side two inductance two in parallel, the 8-dc bus capacitor, 9-voltage and current detecting device, 10-control and drive circuit thereof.
Fig. 2 is a three-phase double step-down full bridge parallel connection type active electric filter structural representation of the present invention.
Number in the figure: 11-AC network, 22-filter inductance, 33-load, 44-filter main circuit, 55-AC side two inductance in parallel, the single power tube brachium pontis of 66-, 77-AC side two inductance two in parallel, the 88-dc bus capacitor, 99-voltage and current detecting device, 101-control and drive circuit thereof.
Fig. 3 is load current, offset current, power network current and the line voltage simulation waveform that the present invention is applied to the 115V/400Hz electrical network.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Embodiment 1:
Accompanying drawing 1 is a single-phase double step-down full bridge parallel connection type active electric filter structural representation of the present invention.
AC network 1, nonlinear load 3 are respectively single phase poaer supply and single-phase load; AC network 1 positive bus-bar serial connection filter inductance 2 back input nonlinear loads 3; Active Power Filter-APF main circuit 4 comprises AC side two inductance 5 in parallel, single power tube brachium pontis 1, single power tube brachium pontis 27 and dc bus capacitor 8 four parts; Two inductance L in parallel in AC side two inductance 5 in parallel 1, L 2One end links to each other as Active Power Filter-APF positive output, links to each other with AC network 1 positive bus-bar, all the other two ends respectively with single power tube brachium pontis 1 in arbitrary brachium pontis mid point link to each other with arbitrary brachium pontis mid point in single power tube brachium pontis 27; Two inductance L in parallel 3, L 4One end links to each other as the Active Power Filter-APF negative output, links to each other with AC network 1 negative busbar, all the other two ends respectively with single power tube brachium pontis 1 in another brachium pontis mid point link to each other with another brachium pontis mid point in single power tube brachium pontis 27; Dc bus capacitor 8 two ends are connected to the positive and negative dc bus of source electric-power filter respectively; Voltage and current detecting device 9 comprises a plurality of voltage sensors and current sensor, many inputs link to each other with the Active Power Filter-APF outlet side with AC network 1 positive and negative busbar, active filter direct current positive and negative busbar, nonlinear load 3, filter inductance 2 input sides respectively, and output links to each other with Active Power Filter-APF control and drive circuit 10 thereof; Control and drive circuit 10 thereof are made of harmonic wave detection calculations circuit, PWM Current Control and drive circuit, voltage and current detecting device 9 output signals are compensated current reference signal by harmonic wave detection calculations circuit, through PWM Current Control link output control signal, drive circuit amplifies isolation to control signal, is input to metal-oxide-semiconductor grid in single power tube brachium pontis 1 and the single power tube brachium pontis 27.Wherein, PWM Current Control link also can be introduced the frequency multiplication modulation technique, and the equivalent frequency of switch is two times of carrier wave, helps improving the compensation characteristic of active filter.The ac output end of Active Power Filter-APF produces corresponding harmonic current and is injected into AC network 1 elimination power network current harmonic wave.
In the foregoing description, each brachium pontis all comprises a metal-oxide-semiconductor and a diode in single power tube brachium pontis 1 and the single power tube brachium pontis 27; Metal-oxide-semiconductor S in single power tube brachium pontis 1 1, S 3Source electrode respectively with diode D 1, D 3Negative electrode links to each other, metal-oxide-semiconductor S 1, S 3Drain electrode connects direct current positive bus, diode D 1, D 3Anode meets negative dc bus, S 1And D 1, S 3And D 3The L of the mid point of two brachium pontis forming two inductance 5 in parallel with AC side respectively 1And L 2, L 3And L 4In arbitrary inductance one end link to each other; Metal-oxide-semiconductor S in single power tube brachium pontis 27 2, S 4The drain electrode respectively with diode D 2, D 4Anode links to each other, metal-oxide-semiconductor S 2, S 4Source electrode connects the direct current negative busbar, diode D 2, D 4Negative electrode connects direct current positive bus, S 2And D 2, S 4And D 4The L of the mid point of two brachium pontis forming two inductance 5 in parallel with AC side respectively 1And L 2, L 3And L 4In another inductance one end link to each other.
L in AC side two inductance 5 in parallel 1, L 2, L 3, L 4The sense value is identical, L 1And L 2, L 3And L 4The mode of incoming transport electrical network can be exchanged, and the connected mode of single power tube brachium pontis one and single power tube brachium pontis two two inductance in parallel with AC side can be exchanged.
Embodiment 2:
Accompanying drawing 2 is three-phase double step-down full bridge parallel connection type active electric filter structural representations of the present invention.AC network 11, nonlinear load 33 are respectively three phase mains and threephase load; The three-phase alternating current bus serial connection filter inductance 22 back input nonlinear loads 33 of AC network 11.Active Power Filter-APF main circuit 44 comprises AC side two inductance 55 in parallel, single power tube brachium pontis 1, single power tube brachium pontis 2 77 and dc bus capacitor 88 4 parts; A two inductance L that are in parallel in the AC side inductance 55 in parallel two 1A, L 2AOne end links to each other and exports mutually as Active Power Filter-APF a, and bus is continuous mutually with AC network 11a, and all the other two ends link to each other with single power tube brachium pontis two mid points with the mutually single power tube brachium pontis one of a respectively; B two inductance L that are in parallel 1B, L 2BOne end links to each other and exports mutually as Active Power Filter-APF b, and bus is continuous mutually with AC network 11b, and all the other two ends link to each other with single power tube brachium pontis two mid points with the mutually single power tube brachium pontis one of b respectively; C two inductance L that are in parallel 1C, L 2COne end links to each other and exports mutually as Active Power Filter-APF c, and bus is continuous mutually with AC network 11c, and all the other two ends link to each other with single power tube brachium pontis two mid points with the mutually single power tube brachium pontis one of c respectively; Dc bus capacitor 88 two ends are connected to the positive and negative dc bus of source electric-power filter respectively; Voltage and current detecting device 99 comprises a plurality of voltage sensors and current sensor, many inputs link to each other with Active Power Filter-APF three-phase outlet side with AC network 11 three-phase bus, Active Power Filter-APF direct current positive and negative busbar, nonlinear load 33 filter inductances 22 three-phase input sides respectively, and output links to each other with Active Power Filter-APF control and drive circuit 101 thereof; Control and drive circuit 101 thereof are made of harmonic wave detection calculations circuit, PWM Current Control and drive circuit, voltage and current detecting device 99 output signals are compensated current reference signal by harmonic wave detection calculations circuit, through PWM Current Control link output control signal, drive circuit amplifies isolation to control signal, is input to the metal-oxide-semiconductor grid of single power tube brachium pontis 1 and single power tube brachium pontis 2 77.The ac output end of Active Power Filter-APF produces corresponding harmonic current and is injected into electrical network elimination power network current harmonic wave.
In the foregoing description, each brachium pontis of three-phase all comprises a metal-oxide-semiconductor and a diode in single power tube brachium pontis 1 and the single power tube brachium pontis 2 77; Metal-oxide-semiconductor S in single power tube brachium pontis 1 1A, S 1B, S 1CSource electrode respectively with diode D 1A, D 1B, D 1CNegative electrode links to each other, metal-oxide-semiconductor S 1A, S 1B, S 1CDrain electrode all connects direct current positive bus, diode D 1A, D 1B, D 1CAnode all connects the direct current negative busbar; S 1AAnd D 1A, S 1BAnd D 1B, S 1CAnd D 1CL in each phase brachium pontis mid point of forming two inductance 55 in parallel with AC side respectively 1AAnd L 2A, L 1BAnd L 2B, L 1CAnd L 2CIn arbitrary inductance one end link to each other; Metal-oxide-semiconductor S in single power tube brachium pontis 2 77 2A, S 2B, S 2CThe drain electrode respectively with diode D 2A, D 2B, D 2CAnode links to each other, metal-oxide-semiconductor S 2A, S 2B, S 2CSource electrode all connects the direct current negative busbar, diode D 2A, D 2B, D 2CNegative electrode all connects direct current positive bus; S 2AAnd D 2A, S 2BAnd D 2B, S 2CAnd D 2CL in each phase brachium pontis mid point of forming two inductance 55 in parallel with AC side respectively 1AAnd L 2A, L 1BAnd L 2B, L 1CAnd L 2CIn another inductance one end link to each other.
L in AC side two inductance 55 in parallel 1A, L 2A, L 1B, L 2B, L 1C, L 2CThe sense value all equates, L 1AAnd L 2A, L 1BAnd L 2B, L 1CAnd L 2CThe mode of incoming transport electrical network 11 each phase can be exchanged, and the connected mode of single power tube brachium pontis 1 and single power tube brachium pontis 2 77 two inductance 55 in parallel with AC side can be exchanged.
Under the MATLAB software environment, the present invention has been set up simulation model, and carried out waveform analysis.Accompanying drawing 3 is load current, offset current, power network current and line voltage simulation waveforms that the present invention is applied to the 115V/400Hz electrical network.Find that by 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 only is 1.22%, simulation result shows: the present invention can better realize power network harmonic wave management, has improved the operational reliability of active power filtering system.

Claims (10)

1. single-phase double step-down full bridge parallel connection type active electric filter, described Active Power Filter-APF is connected with the positive and negative busbar of AC network (1), also comprises filter inductance (2), nonlinear load (3) between the positive and negative busbar of described AC network (1); Described AC network (1), nonlinear load (3) are respectively single phase poaer supply and single-phase load, wherein the positive output end of Active Power Filter-APF is connected with the positive bus-bar of AC network (1), the input of filter inductance (2) respectively, the output of filter inductance (2) is connected with the input of nonlinear load (3), and the output of nonlinear load (3) connects the negative busbar of the negative output terminal of Active Power Filter-APF, AC network (1) respectively; It is characterized in that:
Described Active Power Filter-APF comprises filter main circuit (4), voltage and current detecting device (9), FILTER TO CONTROL and drive circuit (10); Wherein the dc bus of the positive output end of the output of the input of the positive and negative busbar of AC network (1), filter inductance (2), nonlinear load (3), filter main circuit (4), filter main circuit (4) is connected with the input of voltage and current detecting device (9) respectively, the output of voltage and current detecting device (9) is connected with the input of FILTER TO CONTROL and drive circuit (10), and the output of FILTER TO CONTROL and drive circuit (10) is connected with the input of filter main circuit (4);
Described filter main circuit (4) comprises AC side inductance in parallel (5), first single power tube brachium pontis (6), second single power tube brachium pontis (7) and dc bus capacitor (8); Wherein, described AC side inductance in parallel (5) comprises first inductance L 1, second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4Described first single power tube brachium pontis (6), second single power tube brachium pontis (7) comprise the brachium pontis of two parallel connections respectively; First inductance L wherein 1An end, second inductance L 2An end link to each other as the positive output end of filter main circuit (4), first inductance L 1The other end and first single power tube brachium pontis (6) in the mid point of arbitrary brachium pontis link to each other second inductance L 2The other end link to each other with the mid point of arbitrary brachium pontis in second single power tube brachium pontis (7); The 3rd inductance L 3An end, the 4th inductance L 4An end link to each other as the negative output terminal of filter main circuit (4), the 3rd inductance L 3The other end and first single power tube brachium pontis (6) in the mid point of another brachium pontis link to each other the 4th inductance L 4The other end and second single power tube brachium pontis (7) in the mid point of another brachium pontis link to each other;
The two ends of described dc bus capacitor (8) connect the positive and negative dc bus of filter main circuit (4) respectively.
2. single-phase double step-down full bridge parallel connection type active electric filter according to claim 1 is characterized in that: each brachium pontis in described first single power tube brachium pontis (6), the second single power tube brachium pontis (7) all comprises a metal-oxide-semiconductor and a diode respectively.
3. single-phase double step-down full bridge parallel connection type active electric filter according to claim 2 is characterized in that:
First brachium pontis of described first single power tube brachium pontis (6) comprises the first metal-oxide-semiconductor S 1, the first diode D 1, second brachium pontis comprises the 3rd metal-oxide-semiconductor S 3, the 3rd diode D 3The first metal-oxide-semiconductor S wherein 1The source electrode and the first diode D 1Negative electrode link to each other the 3rd metal-oxide-semiconductor S 3Source electrode and the 3rd diode D 3Negative electrode link to each other;
First brachium pontis of described second single power tube brachium pontis (7) comprises the second metal-oxide-semiconductor S 2, the second diode D 2, second brachium pontis comprises the 4th metal-oxide-semiconductor S 4, the 4th diode D 4The second metal-oxide-semiconductor S wherein 2The drain electrode and the second diode D 2Anode connect the 4th metal-oxide-semiconductor S 4Drain electrode and the 4th diode D 4Anode connect;
The first metal-oxide-semiconductor S 1, the 3rd metal-oxide-semiconductor S 3Drain electrode, the second diode D 2Negative electrode, the 4th diode D 4Negative electrode be connected the second metal-oxide-semiconductor S with the direct current positive bus of filter main circuit (4) respectively 2Source electrode, the 4th metal-oxide-semiconductor S 4Source electrode, the first diode D 1, the 3rd diode D 3Anode be connected with the direct current negative busbar of filter main circuit (4) respectively.
4. single-phase double step-down full bridge parallel connection type active electric filter according to claim 1 is characterized in that: described voltage and current detecting device (9) comprises n voltage sensor and m current sensor, and wherein n, m are positive integer; Described FILTER TO CONTROL and drive circuit (10) comprise harmonic wave detection calculations circuit, PWM current control circuit and the drive circuit that order links to each other.
5. single-phase double step-down full bridge parallel connection type active electric filter according to claim 1 is characterized in that: the sense value of each inductance in the described AC side inductance in parallel (5) is identical, wherein first inductance L 1With second inductance L 2, the 3rd inductance L 3With the 4th inductance L 4The mode of incoming transport electrical network (1) can be exchanged, and first single power tube brachium pontis (6), second single power tube brachium pontis (7) can exchange with the connected mode of AC side inductance in parallel (5).
6. three-phase double step-down full bridge parallel connection type active electric filter, described Active Power Filter-APF is connected with the bus of AC network (11), described AC network (11) is a three phase mains, and the bus of described AC network (11) is connected with three-phase filter inductance (22), threephase load (33) respectively; Wherein the output of Active Power Filter-APF is connected with the bus of three phase mains, the input of three-phase filter inductance (22) respectively, and the output of three-phase filter inductance (22) is connected with threephase load (33); It is characterized in that: described Active Power Filter-APF comprises filter main circuit (44), voltage and current detecting device (99), FILTER TO CONTROL and drive circuit (101); Wherein the dc bus of the output of the input of the bus of three phase mains, three-phase filter inductance (22), active filter main circuit (44), active filter main circuit (44) is connected with the input of voltage and current detecting device (99) respectively, the output of voltage and current detecting device (99) is connected with the input of FILTER TO CONTROL and drive circuit (101), and the output of FILTER TO CONTROL and drive circuit (101) is connected with the input of filter main circuit (44);
Described filter main circuit (44) comprises AC side inductance in parallel (55), first single power tube brachium pontis (66), second single power tube brachium pontis (77) and dc bus capacitor (88);
Wherein, described AC side inductance in parallel (55) comprises an A phase inductance L 1A, the 2nd A phase inductance L 2A, a B phase inductance L 1B, the 2nd B phase inductance L 2B, a C phase inductance L 1C, the 2nd C phase inductance L 2CDescribed first single power tube brachium pontis (66), second single power tube brachium pontis (77) comprise the brachium pontis of three parallel connections respectively; An A phase inductance L wherein 1A, the 2nd A phase inductance L 2AAn end link to each other as the A phase output terminal of filter main circuit (44), the A of A phase output terminal and described three phase mains bus mutually links to each other; The one A phase inductance L 1AThe other end link to each other the 2nd A phase inductance L with the mid point of first brachium pontis in first single power tube brachium pontis (66) 2AThe other end link to each other with the mid point of first brachium pontis in second single power tube brachium pontis (77);
A described B phase inductance L 1B, the 2nd B phase inductance L 2BAn end link to each other as the B phase output terminal of filter main circuit (44), the B of B phase output terminal and described three phase mains bus mutually links to each other; The one B phase inductance L 1BThe other end link to each other the 2nd B phase inductance L with the mid point of second brachium pontis in first single power tube brachium pontis (66) 2BThe other end link to each other with the mid point of second brachium pontis in second single power tube brachium pontis (77);
A described C phase inductance L 1C, the 2nd C phase inductance L 2CAn end link to each other as the C phase output terminal of filter main circuit (44), the C of C phase output terminal and described three phase mains bus mutually links to each other; The one C phase inductance L 1CThe other end link to each other the 2nd C phase inductance L with the mid point of the 3rd brachium pontis in first single power tube brachium pontis (66) 2CThe other end link to each other with the mid point of the 3rd brachium pontis in second single power tube brachium pontis (77);
The two ends of described dc bus capacitor (88) connect the positive and negative dc bus of filter main circuit (44) respectively.
7. three-phase double step-down full bridge parallel connection type active electric filter according to claim 6 is characterized in that:
Each brachium pontis in described first single power tube brachium pontis (66), the second single power tube brachium pontis (77) all comprises a metal-oxide-semiconductor and a diode respectively.
8. three-phase double step-down full bridge parallel connection type active electric filter according to claim 7 is characterized in that:
First brachium pontis of described first single power tube brachium pontis (66) comprises an A phase metal-oxide-semiconductor S 1A, an A diode phase D 1ASecond brachium pontis of first single power tube brachium pontis (66) comprises a B phase metal-oxide-semiconductor S 1B, a B diode phase D 1BThe 3rd brachium pontis of first single power tube brachium pontis (66) comprises a C phase metal-oxide-semiconductor S 1C, a C diode phase D 1CAn A phase metal-oxide-semiconductor S wherein 1AA source electrode and an A diode phase D 1ANegative electrode link to each other a B phase metal-oxide-semiconductor S 1BA source electrode and a B diode phase D 1BNegative electrode link to each other a C phase metal-oxide-semiconductor S 1CA source electrode and a C diode phase D 1CNegative electrode link to each other;
First brachium pontis of described second single power tube brachium pontis (77) comprises the 2nd A phase metal-oxide-semiconductor S 2A, the 2nd A diode phase D 2A, second brachium pontis of second single power tube brachium pontis (77) comprises the 2nd B phase metal-oxide-semiconductor S 2B, the 2nd B diode phase D 2B, the 3rd brachium pontis of second single power tube brachium pontis (77) comprises the 2nd C phase metal-oxide-semiconductor S 2C, the 2nd C diode phase D 2C, the 2nd A phase metal-oxide-semiconductor S wherein 2ADrain electrode and the 2nd A diode phase D 2AAnode connect the 2nd B phase metal-oxide-semiconductor S 2BDrain electrode and the 2nd B diode phase D 2BAnode connect the 2nd C phase metal-oxide-semiconductor S 2CDrain electrode and the 2nd C diode phase D 2CAnode connect;
A described A phase metal-oxide-semiconductor S 1ADrain electrode, a B phase metal-oxide-semiconductor S 1BDrain electrode, a C phase metal-oxide-semiconductor S 1CDrain electrode, the 2nd A diode phase D 2ANegative electrode, the 2nd B diode phase D 2BNegative electrode, the 2nd C diode phase D 2CNegative electrode be connected described the 2nd A phase metal-oxide-semiconductor S respectively with the direct current positive bus of filter main circuit (44) 2ASource electrode, the 2nd B phase metal-oxide-semiconductor S 2BSource electrode, the 2nd C phase metal-oxide-semiconductor S 2CSource electrode, an A diode phase D 1AAnode, a B diode phase D 1BAnode, a C diode phase D 1CAnode be connected with the direct current negative busbar of filter main circuit (44) respectively.
9. three-phase double step-down full bridge parallel connection type active electric filter according to claim 6 is characterized in that: described voltage and current detecting device (99) comprises n voltage sensor and m current sensor, and wherein n, m are positive integer; Described FILTER TO CONTROL and drive circuit (101) comprise harmonic wave detection calculations circuit, PWM current control circuit and the drive circuit that order links to each other.
10. three-phase double step-down full bridge parallel connection type active electric filter according to claim 6 is characterized in that: the sense value of each inductance in the described AC side inductance in parallel (55) is identical, wherein an A phase inductance L 1AWith the 2nd A phase inductance L 2A, a B phase inductance L 1BWith the 2nd B phase inductance L 2B, a C phase inductance L 1CWith the 2nd C phase inductance L 2CThe mode of incoming transport electrical network (11) can be exchanged; First single power tube brachium pontis (66), second single power tube brachium pontis (77) can exchange with the connected mode of AC side inductance in parallel (55).
CN201010255222XA 2010-08-17 2010-08-17 Single-phase and three-phase dual buck full-bridge parallel active power filter Expired - Fee Related CN101938127B (en)

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CN114301320A (en) * 2022-01-05 2022-04-08 杜福银 T-shaped coupling inductance voltage type inverter system
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