CN101938126A - Dual-buck half-bridge parallel active power filter based on hysteresis control - Google Patents
Dual-buck half-bridge parallel active power filter based on hysteresis control Download PDFInfo
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Abstract
The invention discloses a dual-buck half-bridge parallel active power filter based on hysteresis control, which comprises a main circuit (1) of the filter, a sampling circuit (2), a control circuit (3) and an isolation drive circuit (4), wherein, the control circuit (3) comprises a harmonic and reactive detection circuit (5), a voltage balancing circuit (6), a current control circuit (7) and a PWM logic circuit (8). The control principle of the active power filter is to control different bridge arms of the active power filter to participate in work according to compensating current polarity so that positive and negative half-waves of compensating current flow through different circuits, and each bridge arm works in the fixed half-waves of the compensating current; and meanwhile an algorithm based on voltage control is used in calculation of harmonic and reactive current, thus requiring no complicated calculation and being simple and reliable. The dual-buck half-bridge parallel active power filter can avoid existence of parallel dual-inductive circular current at an AC side when the two bridge arms of the dual-buck half-bridge parallel active power filter work at the same time, thus being beneficial to lowering system loss and enhancing system efficiency of the active power filter.
Description
Technical field:
The present invention relates to a kind of two step-down half-bridge parallel connection type active electric filters, belong to electric harmonic and suppress technical field based on the ring control that stagnates.
Background technology:
Along with development of modern industry, electric load is load more and more, the capacity that has formed Harmonious Waves in Power Systems is big, the time characteristics that become.Nearly 30 or 40 years, developing rapidly of various power electronic equipments makes the harmonic pollution of utility network be on the rise, and the various faults and the accident that are caused by harmonic wave also constantly take place, and the seriousness of harmonic wave harm causes the concern of people's height.
The harm of harmonic wave can reduce:
(1) efficient of production, transmission and the utilization of electric energy is reduced, make device of overheating of electrical, produce vibration and noise, and make ageing of insulation, shorten useful life, even break down or burn.
(2) cause local parallel resonance of electric power system or series resonance, harmonic content is amplified, cause equipment burnouts such as capacitor.Also can cause relaying protection and automatics misoperation, electric energy metrical is caused confusion.
(3) for the electric power system outside, harmonic wave can produce serious interference to communication equipment and electronic equipment.
Active Power Filter-APF is to generally acknowledge the most effective means of the comprehensive regulation " electric network pollution ", and wherein shunt active power filter at present and the following status that all will occupy main flow.Begun on industry and civil equipment, to be extensive use of Active Power Filter-APF in the world, and its capacity progressively improves, function also from strength to strength not only can the compensation harmonic electric current, also has functions such as compensation fundamental wave reactive power, balanced three-phase voltage, inhibition voltage flicker.
But also just because of its capacity and function expansion have also proposed requirements at the higher level to shunt active power filter self-operating safety.For two step-down half-bridge parallel connection type active electric filters, its single tube brachium pontis structure can be avoided the danger of bridge arm direct pass fully, but adopts conventional control method to the pipe conduction mode obviously can increase loss, the especially existence of inductance circulation of loop of power circuit.Therefore, how to reduce two step-down half-bridge parallel connection type active electric filter running wastages, improve its unit efficiency, avoid the overheated plant issue that causes, do not lose its filtering characteristic simultaneously, on control strategy, make improvements significant.
Summary of the invention
Goal of the invention:
The objective of the invention is to two step-down half-bridge parallel connection type active electric filters is object, deficiency at its control technology existence, a kind of two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates are proposed, the existence of AC side two inductance circulation in parallel when avoiding two step-down half-bridge parallel connection type active electric filter two brachium pontis to work simultaneously, help reducing the active filter system loss, improve system effectiveness, and do not lose its filtering characteristic.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
A kind of two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates, comprise filter main circuit, sample circuit, control circuit and isolated drive circuit, the input of described filter main circuit is connected with an end of electrical network positive bus-bar, filter inductance respectively, the other end of filter inductance connects an end of nonlinear load, and the output of filter main circuit connects the other end of nonlinear load, the negative busbar of electrical network; The filter main circuit also is connected with the input of sample circuit, and control circuit comprises humorous idle testing circuit, equalizer circuit, current control circuit and the PWM logical circuit of involving; The wherein humorous input of idle testing circuit, the first input end of equalizer circuit, the first input end of current control circuit of involving is connected with the output of sample circuit respectively; The humorous output that involves idle testing circuit is connected with second input of equalizer circuit, second input of current control circuit respectively, the output of equalizer circuit is connected with the 3rd input of current control circuit, and the output of current control circuit is connected with the filter main circuit after connecting PWM logical circuit, isolated drive circuit successively.
Further, the filter main circuit of the above-mentioned two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating comprises first inductance L
1, second inductance L
2, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the first diode D
1, the second diode D
2, first capacitor C
1, second capacitor C
2First inductance L wherein
1An end and second inductance L
2An end connect input as the filter main circuit, first inductance L
1The other end respectively with the first metal-oxide-semiconductor S
1Source electrode, the first diode D
1Negative electrode be connected second inductance L
2The other end respectively with the second metal-oxide-semiconductor S
2Drain electrode, the second diode D
2Anode connect; Described first capacitor C
1An end, second capacitor C
2An end interconnect output as the filter main circuit; Described first capacitor C
1The other end, the first metal-oxide-semiconductor S
1Drain electrode, the second diode D
2Negative electrode be connected described second capacitor C
2The other end, the second metal-oxide-semiconductor S
2Source electrode, the first diode D
1Anode be connected;
Aforesaid sample circuit comprises load current sampling CT1, offset current sampling CT2, line voltage sampling VT1, first capacitor C
1Voltage sample VT2, second capacitor C
2Voltage sample VT3; Wherein sampled value input harmonics and the idle testing circuit of load current sampling CT1, line voltage sampling VT1, first capacitor C
1Voltage sample VT2, second capacitor C
2Sampled value respectively simultaneously input harmonics and idle testing circuit, equalizer circuit; The sampled value input current control circuit of offset current sampling CT2.
Further, humorous the involving of the above-mentioned two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating comprises first subtracter, second subtracter, phase-locked loop, voltage regulator, multiplier in the idle testing circuit; The sampled value V of wherein said line voltage sampling VT1
SThe first input end of input multiplier behind phase-locked loop, described first capacitor C
1Voltage sample VT2, second capacitor C
2The sampled value of voltage sample VT3 is imported the negative input end of first subtracter respectively, and the dc voltage reference value is imported the positive input terminal of first subtracter, and the output of first subtracter inserts second input of multiplier after voltage regulator; The sampled value of the output of multiplier and load current sampling CT1 is imported the positive-negative input end of second subtracter respectively, and the output of second subtracter is the humorous output that involves idle testing circuit.
Further, the equalizer circuit of the above-mentioned two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating comprises the 3rd subtracter, equal voltage regulator, the 4th subtracter; Wherein said first capacitor C
1Voltage sample VT2, second capacitor C
2The sampled value of voltage sample VT3 is imported the positive-negative input end of the 3rd subtracter respectively, the output of the 3rd subtracter connects the input of equal voltage regulator, all the output of voltage regulator connects the negative input end of the 4th subtracter, the humorous output that involves idle testing circuit connects the positive input terminal of the 4th subtracter, and the output of the 4th subtracter is the output of equalizer circuit.
Further, the current control circuit of the above-mentioned two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating comprises the 5th subtracter, current regulator, hysteresis comparator, zero-crossing comparator; The sampled value of wherein said offset current sampling CT2, humorously involve the positive-negative input end that idle testing circuit output inserts the 5th subtracter respectively, the output of the 5th subtracter connects current regulator, hysteresis comparator successively, and the output of hysteresis comparator is as first output of current control circuit; The output of described equalizer circuit connects the positive input terminal of zero-crossing comparator, and the output of zero-crossing comparator is second output of current control circuit.
Further, the PWM logical circuit of the above-mentioned two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating comprises first inverter, second inverter, first logical AND gate, second logical AND gate; Wherein first output of current control circuit connects the input of first inverter, the first input end of second logical AND gate respectively; Second output of current control circuit connects the input of second inverter, second input of second logical AND gate respectively; The output of first inverter, second inverter connects the input of first logical AND gate respectively; The output of first logical AND gate, second logical AND gate is respectively PWM logical circuit two-way output.
Further, the two-way output of the PWM logical circuit of above-mentioned two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates is exported the two-way pwm control signal respectively to drive circuit, and drive circuit is exported the first metal-oxide-semiconductor S of switching tube drive signal to the filter main circuit respectively
1, the second metal-oxide-semiconductor S
2Grid.
Beneficial effect:
1, single tube brachium pontis structure of the present invention is separated body diode from power tube, can distinguish preferred power switch pipe and power diode, thereby reduces switching loss, creates conditions for further improving switching frequency, so that improve filter harmonic compensation characteristic;
2, the present invention can stop the danger of bridge arm direct pass with respect to traditional parallel connection type active electric filter, thereby improves the reliability of active power filtering system; Control need not to be provided with Dead Time, control more simply, reduces Active Power Filter-APF self generation high-frequency harmonic;
3, the present invention adopts the half-wave control method can avoid the generation of AC side two inductance circulation in parallel, reduces the active filter system loss, improves system effectiveness.
Description of drawings:
Fig. 1 is the structure chart of the two step-down half-bridge parallel connection type active electric filters that encircle control based on stagnating of the present invention.
Fig. 2 is the control principle schematic diagram of single-phase pair of step-down half-bridge parallel connection type active electric filter of the present invention.
Fig. 3 is line voltage, power network current and the offset current simulation waveform that the present invention is applied to the 115V/400Hz electrical network.
Fig. 4 is drive signal and the inductive current simulation waveform that the present invention is applied to the 115V/400Hz electrical network.
Number in the figure: 1, filter main circuit, 2, sample circuit, 3, control circuit, 4, isolated drive circuit, 5, humorously involve idle testing circuit, 6, equalizer circuit, 7, current control circuit, 8, the PWM logical circuit.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
As shown in Figure 1, two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates comprise filter main circuit 1, sample circuit 2, control circuit 3 and isolated drive circuit 4, and wherein control circuit 3 comprises humorous idle testing circuit 5, equalizer circuit 6, current control circuit 7 and the PWM logical circuit 8 of involving; Its median filter main circuit 1 is connected with the input of sample circuit 2, the output of sample circuit 2 respectively with the humorous input that involves idle testing circuit 5, the first input end of equalizer circuit 6, the first input end of current control circuit 7 connects, the humorous output that involves idle testing circuit 5 respectively with second input of equalizer circuit 6, second input of current control circuit 7 connects, the output of equalizer circuit 6 is connected with the 3rd input of current control circuit 7, and the output of current control circuit 7 connects PWM logical circuit 8 successively, isolated drive circuit 4 backs are connected with filter main circuit 1.
Accompanying drawing 2 is control principle schematic diagrames of single-phase pair of step-down half-bridge parallel connection type active electric filter of the present invention.
Based on two step-down half-bridge parallel connection type active electric filters of the ring control that stagnates, its active filter system comprises Active Power Filter-APF main circuit 1, sample circuit 2, control circuit 3 and isolated drive circuit.Sample circuit 2 comprises load current sampling CT1, offset current sampling CT2 and line voltage sampling VT1, dc bus capacitor C
1Voltage sample VT2, dc bus capacitor C
2Voltage sample VT3.Control circuit 3 comprises humorous idle testing circuit 5, equalizer circuit 6, current control circuit 7 and the PWM logical circuit 8 of involving, humorously involve idle testing circuit 5 and be input as CT1, VT1, VT2 and VT3 sampled value, be output as the offset current reference signal, insert equalizer circuit 6 and current control circuit 7; Equalizer circuit 6 is input variable VT2 and VT3 sampled value, and the offset current reference signal, is output as the rectification building-out current reference signal, inserts current control circuit 7; Current control circuit 7 input variables are offset current reference signal, CT2 sampled value and rectification building-out current reference signal, are output as pwm signal, insert PWM logical circuit 8; PWM logical circuit 8 input variables are pwm signal, are output as pwm control signal, insert isolated drive circuit.The isolated drive circuit input variable is a pwm control signal, and output switching tube drive signal inserts in the Active Power Filter-APF main circuit 1.
Humorous involving in the idle testing circuit 5, VT1 voltage sample value is extracted the input variable of the synchronous sinusoidal quantity of its unit as multiplier M through phase-locked loop pll; VT2 and VT3 voltage sample value all insert subtracter B
1Negative input end, with dc voltage with reference to V
RefDifference through voltage regulator PI
1After, as another input variable of multiplier M; Multiplier M is output as the power network current fundamental active current, and itself and CT1 current sample amount insert subtracter B respectively
2Positive-negative input end, subtracter B
2Be output as the offset current reference signal, promptly humorously involve 5 outputs of idle testing circuit.
In the equalizer circuit 6, VT2 and VT3 voltage sample value insert subtracter B respectively
3Positive-negative input end, both voltage errors insert equal voltage regulator PI
2, all voltage regulator output harmony involves idle testing circuit 5 outputs and inserts subtracter B respectively after overregulating
4Negative positive input terminal, it is output as offset current N Reference Alignment signal, i.e. equalizer circuit 6 outputs, devote oneself to work in order to judge which brachium pontis in level unit, input back.
In the current control circuit 7, subtracter B
5Positive-negative input end meet humorous idle testing circuit 5 output and CT2 current sampling datas, the subtracter B of involving respectively
5Output inserts current regulator P, and current regulator P is output as modulation wave signal, with its input hysteresis comparator J
1, obtain the Current Control pwm signal; Zero-crossing comparator J
26 outputs of positive input termination equalizer circuit, zero-crossing comparator J
2Output is current polarity and judges pwm signal.
In the PWM logical circuit 8, the hysteresis comparator J of current control circuit 7
1Output meets inverter F
1Input and logical AND gate Y
2An input, logical AND gate Y
2The zero-crossing comparator J of another input termination current control circuit 7
2Output; The zero-crossing comparator J of current control circuit 7
2Output meets inverter F
2Input, inverter F
2Output meet logical AND gate Y
1An input, logical AND gate Y
1Another input termination inverter F
1Output; Logical AND gate Y
1With logical AND gate Y
2Output is 8 outputs of PWM logical circuit.
This control circuit utilizes Voltage loop and load current to be compensated current reference, through the controlled pulse signal in ring modulation back that stagnates, judges pulse signal in conjunction with the positive-negative polarity of offset current benchmark, works as i
C＞0 o'clock, S
2Place brachium pontis participation work; Otherwise, S
1Place brachium pontis participation work.The principle of equalizer circuit is to utilize time difference of two brachium pontis participation work to regulate the balance of voltage of dc bus capacitor.
This control method is used for the single-phase active electric-power filter system, is equally applicable to three-phase system.
Under the MATLAB software environment, the present invention simulation model and waveform analysis have been set up.Accompanying drawing 3 is line voltage, power network current and offset current 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 substantially after overcompensation, and power network current THD only is 2.97%.Fig. 4 is drive signal and the inductive current simulation waveform that the present invention is applied to the 115V/400Hz electrical network.Electric current by driving and inductance can learn that each brachium pontis all only in the complementary work of offset current unipolarity half-wave, the circulation situation can not occur.Simulation result shows: the present invention can better realize power network harmonic wave management, has improved the operational efficiency of active power filtering system simultaneously, has reduced loss.
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 (7)
1. two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates, comprise filter main circuit (1), sample circuit (2), control circuit (3) and isolated drive circuit (4), the input of described filter main circuit (1) respectively with the electrical network positive bus-bar, one end of filter inductance connects, the other end of filter inductance connects an end of nonlinear load, the output of filter main circuit (1) connects the other end of nonlinear load, the negative busbar of electrical network, the input of sample circuit (2) respectively with filter main circuit (1), the grid side circuit connects, be used to gather electric current, the sampled value of voltage is characterized in that: described control circuit (3) comprises the humorous idle testing circuit (5) that involves, equalizer circuit (6), current control circuit (7) and PWM logical circuit (8); The wherein humorous input of idle testing circuit (5), the first input end of equalizer circuit (6), the first input end of current control circuit (7) of involving is connected with the output of sample circuit (2) respectively; The humorous output that involves idle testing circuit (5) is connected with second input of equalizer circuit (6), second input of current control circuit (7) respectively, the output of equalizer circuit (6) is connected with the 3rd input of current control circuit (7), and the output of current control circuit (7) connects PWM logical circuit (8) successively, isolated drive circuit (4) back is connected with filter main circuit (1).
2. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 1, it is characterized in that: described filter main circuit (1) comprises first inductance L
1, second inductance L
2, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the first diode D
1, the second diode D
2, first capacitor C
1, second capacitor C
2First inductance L wherein
1An end and second inductance L
2An end connect input as filter main circuit (1), first inductance L
1The other end respectively with the first metal-oxide-semiconductor S
1Source electrode, the first diode D
1Negative electrode be connected second inductance L
2The other end respectively with the second metal-oxide-semiconductor S
2Drain electrode, the second diode D
2Anode connect; Described first capacitor C
1An end, second capacitor C
2An end interconnect output as filter main circuit (1); Described first capacitor C
1The other end, the first metal-oxide-semiconductor S
1Drain electrode, the second diode D
2Negative electrode be connected described second capacitor C
2The other end, the second metal-oxide-semiconductor S
2Source electrode, the first diode D
1Anode be connected;
Described sample circuit (2) comprises load current sampling CT1, offset current sampling CT2, line voltage sampling VT1, first capacitor C
1Voltage sample VT2, second capacitor C
2Voltage sample VT3; Wherein sampled value input harmonics and the idle testing circuit (5) of load current sampling CT1, line voltage sampling VT1, first capacitor C
1Voltage sample VT2, second capacitor C
2Sampled value respectively simultaneously input harmonics and idle testing circuit (5), equalizer circuit (6); The sampled value input current control circuit (7) of offset current sampling CT2.
3. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 2, it is characterized in that: described humorous involving comprises the first subtracter (B in the idle testing circuit (5)
1), the second subtracter (B
2), phase-locked loop (PLL), voltage regulator (PI
1), multiplier (M); The sampled value V of wherein said line voltage sampling VT1
SThe first input end of input multiplier (M) behind phase-locked loop (PLL), described first capacitor C
1Voltage sample VT2, second capacitor C
2The sampled value of voltage sample VT3 is imported the first subtracter (B respectively
1) negative input end, dc voltage reference value (V
Ref) the input first subtracter (B
1) positive input terminal, the first subtracter (B
1) output through voltage regulator (PI
1) back second input that inserts multiplier (M); The sampled value of the output of multiplier (M) and load current sampling CT1 is imported the second subtracter (B respectively
2) positive-negative input end, the second subtracter (B
2) output be the humorous output that involves idle testing circuit (5).
4. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 2, it is characterized in that: described equalizer circuit (6) comprises the 3rd subtracter (B
3), equal voltage regulator (PI
2), the 4th subtracter (B
4); Wherein said first capacitor C
1Voltage sample VT2, second capacitor C
2The sampled value of voltage sample VT3 is imported the 3rd subtracter (B respectively
3) positive-negative input end, the 3rd subtracter (B
3) output connect equal voltage regulator (PI
2) input, equal voltage regulator (PI
2) output connect the 4th subtracter (B
4) negative input end, the humorous output that involves idle testing circuit (5) connects the 4th subtracter (B
4) positive input terminal, the 4th subtracter (B
4) output be the output of equalizer circuit (6).
5. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 2, it is characterized in that: described current control circuit (7) comprises the 5th subtracter (B
5), current regulator (P), hysteresis comparator (J
1), zero-crossing comparator (J
2); Sampled value, humorous idle testing circuit (5) output that involves of wherein said offset current sampling CT2 insert the 5th subtracter (B respectively
5) positive-negative input end, the 5th subtracter (B
5) output connect current regulator (P), hysteresis comparator (J successively
1), hysteresis comparator (J
1) output as first output of current control circuit (7); The output of described equalizer circuit (6) connects zero-crossing comparator (J
2) positive input terminal, zero-crossing comparator (J
2) output be second output of current control circuit (7).
6. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 1, it is characterized in that: described PWM logical circuit (8) comprises the first inverter (F
1), the second inverter (F
2), the first logical AND gate (Y
1), the second logical AND gate (Y
2); Wherein first output of current control circuit (7) connects the first inverter (F respectively
1) input, the second logical AND gate (Y
2) first input end; Second output of current control circuit (7) connects the second inverter (F respectively
2) input, second input of second logical AND gate; First inverter (the F
1), the second inverter (F
2) output connect the first logical AND gate (Y respectively
1) input; First logical AND gate (the Y
1), the second logical AND gate (Y
2) output be respectively PWM logical circuit (8) two-way output.
7. the two step-down half-bridge parallel connection type active electric filters based on the ring control that stagnates according to claim 6, it is characterized in that: the two-way output of described PWM logical circuit (8) is exported the two-way pwm control signal respectively to drive circuit (4), and drive circuit (4) is exported the first metal-oxide-semiconductor S of switching tube drive signal to the filter main circuit (1) respectively
1, the second metal-oxide-semiconductor S
2Grid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102552094A CN101938126B (en) | 2010-08-17 | 2010-08-17 | Dual-buck half-bridge parallel active power filter based on hysteresis control |
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|---|---|---|---|
| CN2010102552094A CN101938126B (en) | 2010-08-17 | 2010-08-17 | Dual-buck half-bridge parallel active power filter based on hysteresis control |
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| CN101938126B CN101938126B (en) | 2012-11-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947616A (en) * | 2017-12-07 | 2018-04-20 | 哈尔滨工业大学 | Soft switch power amplifier |
| CN112803822A (en) * | 2021-03-18 | 2021-05-14 | 会泽云能投新能源开发有限公司 | Wind power converter parallel system based on DPWM strategy and zero sequence circulating current suppression method thereof |
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| CN101145740A (en) * | 2007-10-29 | 2008-03-19 | 南京航空航天大学 | Coupling inductance dual-buck full bridge inverter |
| CN101388617A (en) * | 2008-11-05 | 2009-03-18 | 南京航空航天大学 | Double step-down bridge type inverter controlling method for single current sensor |
| CN201758284U (en) * | 2010-08-17 | 2011-03-09 | 南京航空航天大学 | Active power filter based on hysteresis control |
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| CN107947616A (en) * | 2017-12-07 | 2018-04-20 | 哈尔滨工业大学 | Soft switch power amplifier |
| CN107947616B (en) * | 2017-12-07 | 2019-12-31 | 哈尔滨工业大学 | Soft switch power amplifier |
| CN112803822A (en) * | 2021-03-18 | 2021-05-14 | 会泽云能投新能源开发有限公司 | Wind power converter parallel system based on DPWM strategy and zero sequence circulating current suppression method thereof |
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