CN104578731A - Harmonic suppression double closed loop control circuit and harmonic suppression device - Google Patents
Harmonic suppression double closed loop control circuit and harmonic suppression device Download PDFInfo
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- CN104578731A CN104578731A CN201510038230.1A CN201510038230A CN104578731A CN 104578731 A CN104578731 A CN 104578731A CN 201510038230 A CN201510038230 A CN 201510038230A CN 104578731 A CN104578731 A CN 104578731A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
Abstract
The invention relates to the technical field of an electric system, in particular to a harmonic suppression double closed loop control circuit and a harmonic suppression device. The harmonic suppression double closed loop control circuit comprises a voltage outer ring and an electric current inner ring, wherein the voltage outer ring is used for generating inductance instruction current according to sinusoidal half-wave voltage output by a half-wave rectification bridge and a pre-determined output voltage value in a rectifying circuit; the electric current inner ring is used for conducting hysteresis comparison of inductive current on inductance in the rectifying circuit with the inductance instruction current; a controlling signal is generated according to a result of the comparison result; the electric current inner ring is further used for transmitting the controlling signal to a switch tube in the rectifying circuit to control the turn-on and turn-off of the switch tube and to make the phase of the inductive current match with the phase of the inductance instruction current. The harmonic suppression double closed loop control circuit and the harmonic suppression device provided by the embodiment can make the phase matching of the inductive current with the inductance instruction current, and the purpose of suppressing harmonic waves generated in the power grid is achieved.
Description
Technical field
The present invention relates to technical field of power systems, in particular to harmonics restraint Double-closed-loop control circuit and harmonic suppression apparatus.
Background technology
Along with the development of technology, the popularization and application thereupon of a large amount of novel power supply, as Switching Power Supply, uninterrupted power supply, ac-dc-ac frequency converter etc.
Above-mentioned power supply mode of operation mostly in actual applications is: adopt rectification circuit after capacitor filtering, for the inverter even load of rear class provides DC power supply.But the access of rectification circuit often brings harmonic wave to electrical network, cause the decline of the electrical network quality of power supply.
Summary of the invention
The object of the present invention is to provide harmonics restraint Double-closed-loop control circuit and harmonic suppression apparatus, to suppress the harmonic wave produced in electrical network.
Embodiments provide a kind of harmonics restraint Double-closed-loop control circuit, comprising: outer voltage and current inner loop; Described outer voltage, for the sinusoidal half-wave voltage exported according to half-wave rectifier bridge in rectification circuit and the output voltage values preset, generates inductance instruction current; Described current inner loop, for the inductive current on inductance in rectification circuit and described inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generates control signal; Also for described control signal being transferred to the switching tube in described rectification circuit, to control conducting, the shutoff of described switching tube, make described inductive current and described inductance instruction current phase matched.
Preferably, described outer voltage, comprising: amplitude generation module, for according to the actual direct voltage of output of described rectification circuit and the output voltage values of setting, generates inductance instruction current amplitude; Phase generating module, for generating inductance instruction current phase place according to described sinusoidal half-wave voltage; Inductance instruction current generation module, for generating described inductance instruction current according to described inductance instruction current amplitude and described inductance instruction current phase place.
Preferably, described amplitude generation module, comprising: the first subtracter, for will setting described output voltage values and the actual direct voltage exported of described rectification circuit poor, obtain voltage difference; Proportional-integral-differential PID controller, for carrying out proportional-integral-differential process to described voltage difference, obtains described inductance instruction current amplitude.
Preferably, described phase generating module, comprises divider; Described divider, for by described sinusoidal half-wave voltage divided by its amplitude, obtain described inductance instruction current phase place.
Preferably, described inductance instruction current generation module, comprising: multiplier, for by described inductance instruction current amplitude and described inductance instruction current phase multiplication, obtains described inductance instruction current.
Preferably, described current inner loop, comprising: the second subtracter, for by poor for inductive current actual on described inductance instruction current and described inductance, obtains current differential; Hysteresis comparator, for judging whether described current differential is greater than the difference upper limit of setting, if so, then generates the control signal for controlling described switching tube conducting; Also for judging whether described current differential is less than the difference lower limit of setting, if so, then the control signal turned off for controlling described switching tube is generated.
The embodiment of the present invention additionally provides a kind of harmonic suppression apparatus, comprising: harmonics restraint Double-closed-loop control circuit and rectification circuit; Described rectification circuit comprises: half-wave rectifier bridge, inductance, switching tube and filter circuit; Described half-wave rectifier bridge, for AC power halfwave rectifier, exports sinusoidal half-wave voltage; After the parallel circuit in series of described inductance and described switching tube and described filter circuit, in parallel with the output of described half-wave rectifier bridge, wherein said filter circuit is used for the direct voltage after load output filtering; Described harmonics restraint Double-closed-loop control circuit, for according to described sinusoidal half-wave voltage and the output voltage values that presets, generates inductance instruction current; Also for the inductive current on described inductance and described inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generate control signal; Also for described control signal is transferred to described switching tube, to control conducting, the shutoff of described switching tube, make described inductive current and described inductance instruction current phase matched.
Preferably, described harmonics restraint Double-closed-loop control circuit realizes based on fpga chip.
Preferably, described half-wave rectifier bridge, comprising: the first pulse-width modulation PWM rectifying tube, the 2nd PWM rectifying tube, the 3rd PWM rectifying tube and the 4th PWM rectifying tube; A described PWM rectifying tube is connected with the 2nd PWM rectifying tube, obtains the first series circuit; Described 3rd PWM rectifying tube is connected with described 4th PWM rectifying tube, obtains the second series circuit; Described first series circuit is in parallel with described second series circuit, exports described sinusoidal half-wave voltage.
Preferably, described filter circuit comprises: diode and electric capacity; The negative electrode of described diode is connected with one end of described electric capacity, the anode of described diode, the other end of described electric capacity and described paralleled power switches.
The harmonics restraint Double-closed-loop control circuit that the embodiment of the present invention provides and harmonic suppression apparatus, by the conducting of control switch pipe, turn off and control inductive current on inductance and inductance instruction current phase matched, and then make the phase matched of inductive current and sinusoidal half-wave voltage, reach the object suppressing the harmonic wave produced in electrical network.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the structural representation of the embodiment of the present invention one harmonics restraint Double-closed-loop control circuit;
Fig. 2 shows the structural representation of the embodiment of the present invention three harmonic suppression apparatus;
Fig. 3 shows the structural representation of the embodiment of the present invention four harmonic suppression apparatus;
Fig. 4 shows the schematic diagram of Double-closed-loop control circuit in the embodiment of the present invention four harmonic suppression apparatus;
Fig. 5 shows the circuit theory diagrams of the embodiment of the present invention four harmonic suppression apparatus;
Fig. 6 shows the flow chart of genetic algorithm in PID controller in the present invention.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Embodiment one
In order to suppress the harmonic wave produced in electrical network, a kind of harmonics restraint Double-closed-loop control circuit is provided in the present embodiment, turn in the process of direct current exchanging AC power, utilize this control circuit can control conducting, the closedown of rectification circuit breaker in middle pipe, and then effective harmonic wave suppressing to produce in electrical network.
To achieve these goals, the harmonics restraint Double-closed-loop control circuit in the present embodiment, as shown in Figure 1, comprising: outer voltage 51 and current inner loop 52; Outer voltage 51, for the sinusoidal half-wave voltage exported according to the half-wave rectifier bridge in rectification circuit and the output voltage values preset, generates inductance instruction current; Current inner loop 52, for the inductive current on inductance in rectification circuit and inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generates control signal; Also for control signal being transferred to the switching tube in rectification circuit, with the conducting of control switch pipe, shutoff, make inductive current and inductance instruction current phase matched.
In the present embodiment, by control rectification circuit breaker in middle pipe conducting, turn off the phase matched making the sinusoidal half-wave voltage that half-wave rectifier bridge exports in the inductive current in rectification circuit on inductance and rectification circuit, make rectification circuit ac-side current sineization to a certain extent, thus reduce the non-linear of device, effectively inhibit the harmonic wave produced because of the access of rectification circuit in electrical network.
This device of the present embodiment, the inductive current on inductance is substantially identical with the sinusoidal half-wave voltage phase place that half-wave rectifier bridge exports, and not only effectively inhibits the harmonic wave produced in electrical network, and makes the power factor of circuit be approximately 1, improves the power-performance of circuit.
Embodiment two
The present embodiment provides a kind of preferred embodiment of harmonics restraint Double-closed-loop control circuit on the basis of embodiment one, and this circuit comprises outer voltage 51 and current inner loop 52, and its function is identical with embodiment one, repeats no more herein.
In order to effective harmonic wave to producing in electrical network suppresses, mainly utilize the conducting of the control signal switch tube produced in Double-closed-loop control circuit, turn off control, thus the inductive current in control rectification circuit, inductance produced is identical with the phase place of the half-wave sinusoidal voltage that half-wave rectifier bridge in rectification circuit produces, reach the effect of harmonic inhabitation, be described in detail to the concrete structure of harmonics restraint Double-closed-loop control circuit below.
Harmonics restraint Double-closed-loop control circuit in the present embodiment have employed double-closed-loop control structure, as shown in Figure 1, outer voltage 51, comprising: amplitude generation module 511, for according to the direct voltage of output actual on rectification circuit and the output voltage values of setting, generate inductance instruction current amplitude; Phase generating module 512, for generating inductance instruction current phase place according to sinusoidal half-wave voltage; Inductance instruction current generation module 513, for generating inductance instruction current according to inductance instruction current amplitude and inductance instruction current phase place.
In above-mentioned outer voltage 51 structure, amplitude generation module 511, comprising: the first subtracter, for will setting output voltage values and the actual direct voltage exported of rectification circuit poor, obtain voltage difference; Proportional-integral-differential PID controller, for carrying out proportional-integral-differential process to voltage difference, obtains inductance instruction current amplitude.
Phase generating module 512, comprises divider; Divider, for by sinusoidal half-wave voltage divided by its amplitude, obtain inductance instruction current phase place.
Inductance instruction current generation module 513, comprising: multiplier, for by inductance instruction current amplitude and inductance instruction current phase multiplication, obtains inductance instruction current.
Current inner loop 52, comprising: the second subtracter 522, for by poor for inductive current actual on inductance instruction current and inductance 2, obtains current differential; Hysteresis comparator 521, for judging whether current differential is greater than the difference upper limit of setting, if so, then generates the control signal being used for control switch pipe 3 conducting; Also for judging whether current differential is less than the difference lower limit of setting, if so, then the control signal being used for control switch pipe 3 and turning off is generated.
Embodiment three
Based on the harmonics restraint Double-closed-loop control circuit of above-mentioned enforcement one and embodiment two, present embodiments provide a kind of harmonic suppression apparatus.As shown in Figure 2, this harmonic suppression apparatus comprises harmonics restraint Double-closed-loop control circuit 5 and rectification circuit.
Wherein, rectification circuit comprises: half-wave rectifier bridge 1, inductance 2, switching tube 3 and filter circuit 4; Half-wave rectifier bridge 1, for AC power halfwave rectifier, exports sinusoidal half-wave voltage; After the parallel circuit in series of inductance 2 and switching tube 3 and filter circuit 4, in parallel with the output of half-wave rectifier bridge 1, in this circuit, filter circuit 4 is for the direct voltage after load output filtering; Harmonics restraint Double-closed-loop control circuit 5, for according to sinusoidal half-wave voltage and the output voltage values that presets, generates inductance instruction current; Also for the inductive current on inductance and inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generate control signal; Also for control signal is transferred to switching tube 3, with the conducting of control switch pipe 3, shutoff, make inductive current and inductance instruction current phase matched.
In the present embodiment, by the conducting of control switch pipe 3, turn off and control inductive current on inductance 2 and inductance instruction current phase matched, and then make the phase matched of inductive current and sinusoidal half-wave voltage, reach the object of the harmonic wave produced in suppression electrical network.
Embodiment four
Based on embodiment three, present embodiments provide the preferred implementation of harmonic suppression apparatus, as shown in Figure 3, this harmonic suppression apparatus comprises: ac-dc conversion circuit 31, switching tube 32, filter circuit 33, FPGA36, driver module 35 and load 34.
In harmonic suppression apparatus shown in Fig. 3, FPGA36 is for realizing above-mentioned harmonics restraint Double-closed-loop control circuit.
In this device, ac-dc conversion circuit 31 comprises half-wave rectifier bridge and inductance; FPGA36 comprises the first control circuit (i.e. harmonics restraint Double-closed-loop control circuit) for the conducting of control switch pipe, closedown, and first control circuit produces pwm signal with the conducting of control switch pipe 32 and closedown; The second control circuit for controlling ac-dc conversion circuit 31 is also comprised in FPGA36, this second control circuit is for generation of sinusoidal pulse width modulation (the Sinusoidal Pulse Width Modulation controlling ac-dc conversion circuit 31, SPWM) signal, SPWM signal controls conducting, the closedown of ac-dc conversion circuit 31 through driver module 35, thus control the output voltage of ac-dc conversion circuit 31, the Double closed-loop of voltage and current that what wherein second control circuit adopted is under synchronous rotating frame.
The schematic diagram of first control circuit in this embodiment that Fig. 4 is shown.As shown in Figure 4, this first control circuit is Double-closed-loop control circuit, comprise outer voltage 361 and current inner loop 362, and outer voltage 361 comprises PID controller, kp, ki and kd tri-parameters of PID controller adopt genetic algorithm to be optimized design, are hereafter described in detail to the control procedure of first control circuit.
Fig. 5 shows the circuit theory diagrams of this harmonic suppression apparatus, and in Fig. 5, Q is switching tube, L is inductance, C is electric capacity, R is load.
As shown in Figure 5, in harmonic suppression apparatus, half-wave rectifier bridge comprises: PWM rectifying tube A1, PWM rectifying tube A2, PWM rectifying tube A3 and PWM rectifying tube A4; PWM rectifying tube A1 connects with PWM rectifying tube A2, obtains the first series circuit; PWM rectifying tube A3 connects with PWM rectifying tube A4, obtains the second series circuit; First series circuit is in parallel with the second series circuit, exports sinusoidal half-wave voltage u
d.
As shown in Figure 5, filter circuit 33 comprises: diode D and electric capacity C; The negative electrode of diode D is connected with one end of electric capacity C, and the anode of diode D, the other end of electric capacity C are in parallel with switching tube Q.
Harmonic suppression apparatus in the present embodiment, PWM commutation technique is adopted in ac-dc conversion circuit, and have employed hereditary PID complex control algorithm, and a DC-DC power conversion circuit is increased between single-phase bridge rectifier and load resistance, wherein, DC-DC power conversion circuit comprises inductance L, diode D, switching tube Q, electric capacity C.By the break-make of suitable control switch pipe Q, by the input current (current i namely on inductance of rectifier
l) be corrected to the synchronous sine wave with line voltage, harmonic carcellation and reactive current, power factor of electric network is brought up to and is approximately 1.
Genetic algorithm PID controls harmonic suppression circuit, refer to and incorporate by the active device of hereditary PID complex control algorithm in traditional rectification circuit, make ac-side current sineization to a certain extent, thus reduce the non-linear of device, improve a kind of high-frequency rectification circuit of power factor, harmonic reduction.
Genetic algorithm is a kind of random search algorithm based on biological natural selection and Genetic Mechanisms, and it searches for from the initial solution of one group of " population (Population) " produced at random.Each individuality in population is a solution of problem, is called " chromosome (chromosome) ".Chromosome is a string symbol, such as a string of binary characters.These chromosomes are constantly evolved in successive iterations, are called heredity.Use " just when (fitness) " to measure chromosomal quality in each generation, the chromosome of future generation of generation is called offspring (offspring).Offspring by last generation chromosome by intersect (crossover) or variation (mutation) computing is formed.
In forming process of new generation, the size according to appropriateness selects part offspring, eliminates part offspring.Thus keep Population Size to be constant.The probability selected just when high chromosome is higher, and like this after some generations, algorithmic statement is in best chromosome, and it is exactly probably optimal solution or the suboptimal solution of problem.It comprises coding, the generation of initial population, fitness value assessment detection, selection, intersection, variation five steps.
Whether kp, ki and kd in PID controller tri-parameters are reasonable, and directly affect the performance of PID controller, at present, PID controller parameter mainly manually adjusts, and this method is not only time-consuming, and can not ensure to obtain best performance.In order to make the control of system reach best, after adopting genetic algorithm optimization PID controller parameter, then the parameter optimized is brought into PID controller.Hereditary PID complex control algorithm that Here it is.
The step of genetic algorithm optimization pid parameter as shown in Figure 6, comprising:
(1) genetic algorithm produces initial population;
(2) each individuality of population successively assignment to Kp, Ki, Pd;
(3) by income value action control system model, obtain the relevance grade functional value of each individuality in population, judge whether the end condition meeting algorithm, if meet, exit, and obtain optimum individual, if do not meet, then go to step (4);
(4) genetic algorithm carries out selecting, retaining elite, intersection, variation, produces new population, and goes to step (2).
As shown in Figure 5, assuming that switching frequency is enough high, ensure the current continuity of inductance L, output capacitance C is enough large, output voltage u
oconstant DC voltage can be thought.Line voltage u
ifor ideal sinusoidal, i.e. u
i=U
msin ω t, then the output voltage u of half-wave rectifier bridge
dfor half-sinusoid, i.e. u
d=| u
i|=| U
msin ω t|.
When switching tube Q conducting, u
dto inductance L charging, inductive current i
lincrease, electric capacity C discharges to load R; When switching tube Q turns off, during diode D conducting, inductance L both end voltage u
loppositely, u
dand u
lelectric capacity C is charged, inductive current i
lreduce, inductive current i
lmeet formula:
By the break-make of control switch pipe Q, namely regulate duty ratio, inductive current i can be controlled
l.If can control i
lbe approximately sinusoidal half-wave current, and with voltage u
dhomophase, then rectifier bridge ac-side current i
ialso be approximately sinusoidal current, and with line voltage u
isame-phase, can reach the object of harmonics restraint and power factor correction, and the outer voltage taking introducing one to be controlled by hereditary PID complex control algorithm here, the double-closed-loop control device of current inner loop realize.This controller can meet two requirements: one is realize output dc voltage u
oadjustment, make it reach set-point; Two is ensure grid side current sinusoidal, and power factor is 1, namely at regulated output voltage u
owhen, make inductive current i
lwith u
dwaveform is identical.Its schematic circuit structure as shown in Figure 4.
Outer voltage 361 is mainly used to the inductance instruction current i* obtaining realizing control objectives
l.Given output voltage u*
odeduct the actual output voltage u measured
odifference, outputting inductance instruction current amplitude after PID controller.The rectifier bridge exit potential u measured
ddivided by its amplitude U
mafter, can obtain representing u
dthe inductance instruction current phase place u ' of waveform
d, u '
dfor amplitude is the half-sinusoid of 1, phase place and u
didentical.Inductance instruction current amplitude and inductance instruction current phase place u '
d, be multiplied, just can obtain inductance instruction current i*
l.Inductance instruction current i*
lfor with voltage u
dsynchronous sinusoidal half-wave current, its amplitude can control direct voltage u
osize.
Current inner loop 362 is mainly used to the break-make by control switch pipe Q, makes inductive current i actual on inductance
lfollow the tracks of inductance instruction current i*
l.Adopt method for controlling hysteresis loop current herein.According to the formula of inductive current, the inductive current i when switching tube Q conducting
lincrease, and when switching tube Q turns off, inductive current i
lreduce.Make inductance instruction current i*
ldeduct the actual inductive current i on inductance
l, obtain difference DELTA i
l.If difference DELTA i
lbe greater than set upper limit Δ i
lmax, then switching tube Q conducting is made, to increase i
l; If difference DELTA i
lbe less than set upper limit Δ i
lmin(Δ i
lmin<0), then switching tube Q is made to turn off, to reduce i
l.Controlled by the comparison of hysteresis comparator, actual inductive current i can be ensured
lat its command value i*
lneighbouring fluctuation, the size of fluctuation is relevant with hysteresis band, namely with the Δ i set
lmaxwith Δ i
lminrelevant.
And when the PID of outer voltage controls, whether kp, ki and kd in PID controller tri-parameters are reasonable, directly affect the performance of PID controller, at present, PID controller parameter mainly manually adjusts, and this method is not only time-consuming, and can not ensure to obtain best performance.In order to make the control of system reach best, adopting genetic algorithm to be optimized design to PID controller parameter, after adopting genetic algorithm optimization PID controller parameter, then the parameter optimized being brought into PID controller.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (10)
1. harmonics restraint Double-closed-loop control circuit, is characterized in that, comprising: outer voltage and current inner loop;
Described outer voltage, for the sinusoidal half-wave voltage exported according to half-wave rectifier bridge in rectification circuit and the output voltage values preset, generates inductance instruction current;
Described current inner loop, for the inductive current on inductance in rectification circuit and described inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generates control signal; Also for described control signal being transferred to the switching tube in described rectification circuit, to control conducting, the shutoff of described switching tube, make described inductive current and described inductance instruction current phase matched.
2. harmonics restraint Double-closed-loop control circuit according to claim 1, is characterized in that, described outer voltage, comprising:
Amplitude generation module, for according to the actual direct voltage of output of described rectification circuit and the output voltage values of setting, generates inductance instruction current amplitude;
Phase generating module, for generating inductance instruction current phase place according to described sinusoidal half-wave voltage;
Inductance instruction current generation module, for generating described inductance instruction current according to described inductance instruction current amplitude and described inductance instruction current phase place.
3. harmonics restraint Double-closed-loop control circuit according to claim 2, is characterized in that, described amplitude generation module, comprising:
First subtracter, for will setting described output voltage values and the actual direct voltage exported of described rectification circuit poor, obtain voltage difference;
Proportional-integral-differential PID controller, for carrying out proportional-integral-differential process to described voltage difference, obtains described inductance instruction current amplitude.
4. harmonics restraint Double-closed-loop control circuit according to claim 2, is characterized in that, described phase generating module, comprises divider;
Described divider, for by described sinusoidal half-wave voltage divided by its amplitude, obtain described inductance instruction current phase place.
5. harmonics restraint Double-closed-loop control circuit according to claim 2, it is characterized in that, described inductance instruction current generation module, comprising: multiplier, for by described inductance instruction current amplitude and described inductance instruction current phase multiplication, obtain described inductance instruction current.
6. harmonics restraint Double-closed-loop control circuit according to claim 2, is characterized in that, described current inner loop, comprising:
Second subtracter, for by poor for inductive current actual on described inductance instruction current and described inductance, obtains current differential;
Hysteresis comparator, for judging whether described current differential is greater than the difference upper limit of setting, if so, then generates the control signal for controlling described switching tube conducting; Also for judging whether described current differential is less than the difference lower limit of setting, if so, then the control signal turned off for controlling described switching tube is generated.
7. harmonic suppression apparatus, is characterized in that, comprising: harmonics restraint Double-closed-loop control circuit and rectification circuit;
Described rectification circuit comprises: half-wave rectifier bridge, inductance, switching tube and filter circuit;
Described half-wave rectifier bridge, for AC power halfwave rectifier, exports sinusoidal half-wave voltage;
After the parallel circuit in series of described inductance and described switching tube and described filter circuit, in parallel with the output of described half-wave rectifier bridge, wherein said filter circuit is used for the direct voltage after load output filtering;
Described harmonics restraint Double-closed-loop control circuit, for according to described sinusoidal half-wave voltage and the output voltage values that presets, generates inductance instruction current; Also for the inductive current on described inductance and described inductance instruction current are carried out stagnant chain rate comparatively, and according to the result compared, generate control signal; Also for described control signal is transferred to described switching tube, to control conducting, the shutoff of described switching tube, make described inductive current and described inductance instruction current phase matched.
8. harmonic suppression apparatus according to claim 7, is characterized in that, described harmonics restraint Double-closed-loop control circuit realizes based on fpga chip.
9. harmonic suppression apparatus according to claim 7, is characterized in that, described half-wave rectifier bridge, comprising: the first pulse-width modulation PWM rectifying tube, the 2nd PWM rectifying tube, the 3rd PWM rectifying tube and the 4th PWM rectifying tube;
A described PWM rectifying tube is connected with the 2nd PWM rectifying tube, obtains the first series circuit;
Described 3rd PWM rectifying tube is connected with described 4th PWM rectifying tube, obtains the second series circuit;
Described first series circuit is in parallel with described second series circuit, exports described sinusoidal half-wave voltage.
10. harmonic suppression apparatus according to claim 7, is characterized in that, described filter circuit comprises: diode and electric capacity;
The negative electrode of described diode is connected with one end of described electric capacity, the anode of described diode, the other end of described electric capacity and described paralleled power switches.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510038230.1A CN104578731A (en) | 2015-01-26 | 2015-01-26 | Harmonic suppression double closed loop control circuit and harmonic suppression device |
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|---|---|---|---|
| CN201510038230.1A CN104578731A (en) | 2015-01-26 | 2015-01-26 | Harmonic suppression double closed loop control circuit and harmonic suppression device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105429451A (en) * | 2015-12-08 | 2016-03-23 | 广东美的制冷设备有限公司 | PFC inductor saturation suppression circuit and method and power equipment |
| CN105914100A (en) * | 2016-07-12 | 2016-08-31 | 福州大学 | Dynamic reliable control strategy of high-capacity contactor |
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| CN2930084Y (en) * | 2006-07-17 | 2007-08-01 | 海信集团有限公司 | Active power factor corrector |
| CN103078322A (en) * | 2013-01-28 | 2013-05-01 | 河海大学 | Harmonic controller for energy-storing system of wind-power plant and parameter-setting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2930084Y (en) * | 2006-07-17 | 2007-08-01 | 海信集团有限公司 | Active power factor corrector |
| CN103078322A (en) * | 2013-01-28 | 2013-05-01 | 河海大学 | Harmonic controller for energy-storing system of wind-power plant and parameter-setting method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105429451A (en) * | 2015-12-08 | 2016-03-23 | 广东美的制冷设备有限公司 | PFC inductor saturation suppression circuit and method and power equipment |
| CN105914100A (en) * | 2016-07-12 | 2016-08-31 | 福州大学 | Dynamic reliable control strategy of high-capacity contactor |
| CN105914100B (en) * | 2016-07-12 | 2019-01-18 | 福州大学 | A kind of reliable control strategy of dynamic of large capacity contactor |
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