CN103089669A - Titanium fan and working method thereof - Google Patents
Titanium fan and working method thereof Download PDFInfo
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- CN103089669A CN103089669A CN2012105395569A CN201210539556A CN103089669A CN 103089669 A CN103089669 A CN 103089669A CN 2012105395569 A CN2012105395569 A CN 2012105395569A CN 201210539556 A CN201210539556 A CN 201210539556A CN 103089669 A CN103089669 A CN 103089669A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 20
- 239000010936 titanium Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 42
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 230000010363 phase shift Effects 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 11
- 230000001052 transient effect Effects 0.000 claims description 10
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to a titanium fan. The titanium fan comprises a motor which drives fan blades to rotate; the three-phase power input end of the motor is connected with a chain type static var generator (SVG) device which is suitable for correcting a power factor; and the chain type SVG device comprises an H bridge multi-connection type multi-level inverter, an automatic bypass circuit, a sampling circuit, a segregated current independent control circuit and a pulse width modulation circuit. By the chain type SVG device, the problem of power factor decreasing of a power grid due to operation of the motor is corrected, and the utilization ratio of a transformer is increased; and the chain type SVG device is provided with a standby H bridge unit circuit, so that when an H bridge unit circuit is in failure, the faulted H bridge unit circuit is automatically bypassed, and the H bridge multi-connection type multi-level inverter is ensured to work normally, namely the power factor of the power grid is corrected.
Description
Technical field
The present invention relates to a kind of titanium blower fan and method of work.
Background technique
At present, the titanium blower fan is used in some chemical plant of China in chlor-alkali production, and the titanium blower fan is necessary continuous firing in process of production; The continuous firing of titanium blower fan directly affects the on-load ability of electrical network; How electrical network is carried out effective compensation, and when corresponding compensating circuit or module break down, need not that shutdown maintenance guarantees to produce continuously is the technical barrier of related domain.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of titanium blower fan that is suitable for correcting grid power factor.
In order to solve the problems of the technologies described above, the invention provides a kind of titanium blower fan, comprising: be suitable for driving the motor that fan blade rotates in air duct, be fixed with motor shroud outside described motor, motor shroud is provided with induced air pipe, leaves the space as ventilation flue between motor and motor shroud; Three-phase power input end connection one at described motor is suitable for correcting the chain type SVG device of power factor;
Described chain type SVG device comprises:
The multi-electrical level inverter of H electric bridge multi-type, it is made of the three-phase H bridge power model that is connected in described three phase mains, wherein, sets up at least one standby H electric bridge element circuit in every phase H bridge power model; The H bridge element circuit that this multi-electrical level inverter energy auto by pass breaks down to guarantee the normal operation of H electric bridge multi-type multi-electrical level inverter, makes described chain type SVG device continue to reach the purpose of correcting power factor,
The auto by pass circuit is located at the output terminal of each H electric bridge element circuit, and when a H electric bridge element circuit is damaged, with this H electric bridge element circuit bypass;
Sample circuit is suitable for gathering the momentary value of the voltage and current of described three phase mains;
Minute phase current independent controling circuit, it is connected with described sample circuit is suitable for calculating according to the momentary value of the voltage and current of described three phase mains modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Pulse-width modulation circuit is connected with described minute phase current independent controling circuit, is used for modulation ratio M and phase angle according to described sinusoidal modulation wave
The carrier wave pyramidal wave phase shift SPWM that adopts between each H electric bridge element circuit is controlled; Namely, after the H electric bridge element circuit bypass that damages, this pulse-width modulation circuit is suitable on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model.
Further, described minute phase current independent controling circuit comprises:
Phaselocked loop, according to the momentary value of the voltage of described three phase mains to follow the tracks of the voltage-phase of described three phase mains;
The given module of wattless current is suitable for calculating the cosine amount of this voltage-phase and multiplying each other with a wattless current reference value according to the voltage-phase that described phaselocked loop draws, to obtain actual wattless current output;
The given module of active current, be suitable for calculating according to the voltage-phase that described phaselocked loop draws the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
The transient current tracking module, be used for first the electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Compared with prior art, titanium blower fan of the present invention has following advantage: (1) utilizes described chain type SVG device, corrects the problem that causes the power factor of electrical network to descend due to machine operation, has improved the utilization ratio of transformer; (2) be provided with standby H bridge element circuit in described chain type SVG device, in the time of can a H bridge element circuit breaks down again, the H bridge element circuit auto by pass of this fault, and guarantee the normal operation of H electric bridge multi-type multi-electrical level inverter, that is, correct grid power factor; (3) and when this H bridge power model is damaged, need not to shut down maintenance, guaranteed the stable of electrical network; (4) pulse-width modulation circuit is regulated the modulated wave of a phase H bridge power model that is damaged, and has effectively avoided the harmonic wave generation; (5) independently control by minute phase current the compensation problem that has realized the uneven output of three phase mains; (6) the present invention by added motor shroud, can effectively make the parts such as etchant gas and motor isolated, avoids corrosion.
The technical problem that the present invention also will solve is to provide a kind of method of work that is suitable for correcting the titanium blower fan of grid power factor.
In order to address the above problem, the method for work of titanium blower fan of the present invention comprises:
A kind of method of work that is suitable for chain type SVG device comprises:
A: when a H electric bridge element circuit damages, corresponding this H electric bridge element circuit of auto by pass circuit bypass;
B: described pulse-width modulation circuit is on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of described damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model;
The method of work of described minute phase current independent controling circuit comprises the steps:
(1) by phaselocked loop according to the momentary value of voltage of the described three phase mains of input to follow the tracks of the voltage-phase of described three phase mains;
(2) voltage-phase that draws according to described phaselocked loop calculates the cosine amount of this voltage-phase and multiplies each other with a wattless current reference value, to obtain actual wattless current output;
(3) voltage-phase that draws according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
(4) be used for first electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Compared with prior art, the method of work of described titanium blower fan of the present invention has following advantage: (1) is by setting up at least one standby H electric bridge element circuit in every phase H bridge power model, when H bridge power model was damaged, the auto by pass malfunctioning module need not to shut down maintenance; (2) pulse-width modulation circuit is regulated the modulated wave of a phase H bridge power model that is damaged, and has effectively avoided the harmonic wave generation; (3) independently control by minute phase current the compensation problem that has realized the uneven output of three phase mains.
Description of drawings
For content of the present invention is more likely to be clearly understood, below the specific embodiment and by reference to the accompanying drawings of basis, the present invention is further detailed explanation, wherein
The motor of Fig. 1 titanium blower fan of the present invention connects the structural representation of three phase mains and chain type SVG device;
The circuit structure diagram of the multi-electrical level inverter of Fig. 2 H electric bridge of the present invention multi-type;
The structured flowchart of of the present invention minute phase current independent controling circuit of Fig. 3;
The oscillogram of the stacked SPWM modulation of Fig. 4 carrier wave pyramidal wave of the present invention homophase individual layer;
Pulse generate sequential before Fig. 5 generation of the present invention H electric bridge unit module breaks down;
Pulse generate sequential after Fig. 6 the first fault of the present invention H electric bridge unit module is bypassed;
Pulse generate sequential after Fig. 7 the second fault of the present invention H electric bridge unit module is bypassed.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples:
As shown in Figure 1, a kind of titanium blower fan comprises: be suitable for driving the motor that fan blade rotates in air duct, be fixed with motor shroud outside described motor, motor shroud is provided with induced air pipe, leaves the space as ventilation flue between motor and motor shroud; Three-phase power input end connection one at described motor is suitable for correcting the chain type SVG device of power factor;
As shown in Figure 2, described chain type SVG device comprises:
The multi-electrical level inverter of H electric bridge multi-type, it is made of the three-phase H bridge power model that is connected in described three phase mains, wherein, sets up at least one standby H electric bridge element circuit in every phase H bridge power model;
The auto by pass circuit is located at the output terminal of each H electric bridge element circuit, and when a H electric bridge element circuit is damaged, with this H electric bridge element circuit bypass;
Sample circuit is suitable for gathering the momentary value of the voltage and current of described three phase mains, and this momentary value comprises amplitude, the cycle of voltage and current;
Minute phase current independent controling circuit, it is connected with described sample circuit is suitable for calculating according to the momentary value of the voltage and current of described three phase mains modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Pulse-width modulation circuit is connected with described minute phase current independent controling circuit, is used for modulation ratio M and phase angle according to described sinusoidal modulation wave
The carrier wave pyramidal wave phase shift SPWM that adopts between each H electric bridge element circuit is controlled; Namely, after the H electric bridge element circuit bypass that damages, this pulse-width modulation circuit is suitable on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model.
See Fig. 3, described minute phase current independent controling circuit comprises:
Phaselocked loop, according to the momentary value of the voltage of described three phase mains to follow the tracks of the voltage-phase of described three phase mains;
The given module of wattless current is suitable for calculating the cosine amount of this voltage-phase and multiplying each other with a wattless current reference value according to the voltage-phase that described phaselocked loop draws, to obtain actual wattless current output;
The given module of active current, be suitable for calculating according to the voltage-phase that described phaselocked loop draws the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
The transient current tracking module, be used for first the electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Wherein reference current is the offset current of expectation, and the VDC reference value is the offset voltage of expectation.
Described pulse-width modulation circuit relates to SPWM pulsewidth modulation method, this SPWM pulsewidth modulation method is to do modulated wave with a sine wave, doubly do that carrier wave carries out waveform relatively and the one group of amplitude that produces equates to the pyramidal wave of sinusoidal modulation wave frequency with F, width is proportional to the rectangular pulse train of sinusoidal modulation wave and comes equivalent sine wave, thus the break-make of control switch device (being the switching device in multi-electrical level inverter).
The hybrid algo-rithm that the present invention adopts carrier wave pyramidal wave phase shift SPWM to control and the stacked SPWM of carrier wave pyramidal wave controls: as a whole, adopt carrier wave pyramidal wave phase shift SPWM to control between each H electric bridge element circuit, and the method that single H electric bridge element circuit adopts stacked SPWM to control, this modulator approach, output harmonic wave content is little, switching frequency is low, and can solve well the low problem of inversion efficiency.
Carrier wave pyramidal wave phase shift SPWM controls method, refer to for N H electric bridge element circuit, adopt N phase place different, but carrier wave pyramidal wave and same sinusoidal modulation wave that frequency is identical with amplitude compare, produce N group SPWM control impuls waveform and remove respectively to control N H bridge, make each H electric bridge element circuit all export the identical SPWM voltage waveform of fundamental voltage, and then the SPWM voltage waveform of this N H electric bridge element circuit output is superposeed and synthesizes SPWM voltage with multiple levels waveform.
The Initial phase of N carrier wave pyramidal wave should be removed an angle successively, if adopt bipolarity carrier wave pyramidal wave, this angle is
If unipolarity carrier wave pyramidal wave, angle is
The stacked SPWM control of carrier wave pyramidal wave method is to use the SPWM modulation method of a kind of multi-electrical level inverter relatively early.The stacked SPWM modulation method of carrier wave pyramidal wave can be divided into two kinds, i.e. the stacked SPWM modulation method of individual layer and multilayer laminated formula SPWM modulation method, and these two kinds of methods can reach the technique effect of this patent.
The stacked SPWM modulation method of carrier wave pyramidal wave individual layer can be divided into again the stacked SPWM modulation method of the anti-phase individual layer of carrier wave pyramidal wave (single spin-echos of two carrier wave pyramidal waves) and the stacked SPWM modulation method of carrier wave pyramidal wave homophase individual layer (phase place of two carrier wave pyramidal waves is identical) according to the phase relationship of two triangular carriers.The stacked SPWM modulation method of the anti-phase individual layer of carrier wave pyramidal wave and the stacked SPWM modulation method of carrier wave pyramidal wave homophase individual layer this in two modulator approach do not have what quality minute, the present invention adopts the stacked SPWM modulation method of carrier wave pyramidal wave homophase individual layer.
In the stacked SPWM modulation method of carrier wave pyramidal wave homophase individual layer, two carrier wave pyramidal waves
With
Phase place identical, its work wave is as shown in Figure 4.Wherein
With
Be the carrier wave pyramidal wave of the upper and lower layer of transverse axis,
Be sinusoidal modulation wave.Compare with pyramidal wave with sinusoidal wave, at sine wave
Part greater than pyramidal wave can produce output SPWM pulse, at sine wave
Can produce the zero pulse of output voltage less than the part of pyramidal wave.Due to
With
Be homophase, that is to say
With
Be asymmetric with the coordinate transverse axis, so by sinusoidal wave and comparison pyramidal wave, the positive half cycle of the output voltage SPWM waveform of generation is not identical with negative semiaxis.
Appoint and to get a H electric bridge element circuit and study, from the power angle analysis.If
Be the output voltage of H electric bridge element circuit,
Be phase current,
Be the angle of output voltage and phase current, the active power of H electric bridge element circuit absorption is:
, as seen, by change H electric bridge element circuit output voltage size, phase current is big or small and angle between them just can change the active power of H bridge absorption.Because phase current
Size and Orientation fix, so can only change the size and Orientation of H electric bridge element circuit output voltage, namely correspond to modulation ratio M and the phase shifting angle of pulse-width modulation circuit output
The control strategy of chain type SVG adopts the control structure of layering: main total meritorious and wattless power of determining is controlled on the upper strata, and it is mainly to regulate the reasonable distribution of gaining merit between each H bridge of this phase that lower floor controls, and guarantees the dc capacitor voltage balance.The method that upper strata of the present invention is controlled adopts a minute phase current independently to control, calculate modulation ratio and the phase angle of the modulated wave of expectation, be that sine function is superimposed upon on the modulated wave of this H electric bridge element circuit with the error quantization of each bridge DC side voltage, modulated wave phase place to each H electric bridge element circuit is finely tuned, and regulates the distribution of gaining merit between each H electric bridge element circuit.
There is not coupled relation in the three-phase dc side of chain type SVG, thereby can realize a minute phase control, and three-phase system is compensated respectively, all reasonable compensation effect can be arranged to balance sysmte and unbalanced system.The control strategy that proposes in leading portion, its upper strata are controlled and are adopted the full decoupled control of current status, and transient response is fast, good stability, but the situation when only having considered three-phase equilibrium when controller designs is not considered the unbalanced problem of three-phase system.Investigation shows to power grid quality, and more or less there be the asymmetric of phase place or amplitude in line voltage, that is to say in actual conditions, and three-phase system is unbalanced mostly.
The auto by pass circuit adopts the auto by pass technology, and the auto by pass technology is exactly directly with the bypass of fault power module AC, thereby realizes separating of malfunctioning module and device.By the outlet side at each power unit module, a bypass mechanism is set and realizes auto by pass.
Can adopt the output terminal at each H electric bridge element circuit to be provided with a relay, utilize to control often to open with normally off and realize that fault H electric bridge element circuit separates with this phase H bridge power model; Also can adopt rectifier bridge and thyristor, the output terminal of each H electric bridge element circuit is connected to the rectifier bridge that two pairs of diodes form, so thyristor is under forward voltage drop all the time.When supervisory system detects the power model internal fault, block immediately the IGBT pulse, and trigger the thyristor conducting, realize that bypass separates; Perhaps adopt bidirectional thyristor.
After having fault H electric bridge element circuit to be bypassed in a certain phase H bridge power model, if the pulse of the sinusoidal modulation signal of pulse-width modulation circuit output sends when sending still according to normal operation, and the output of this chain type SVG control system only has N H electric bridge element circuit output voltage stack, and harmonic content will increase.Therefore, for a remaining N non-fault H electric bridge element circuit, modulation strategy need be done corresponding adjustment.
Because the stacked SPWM of carrier wave pyramidal wave just works in single H electric bridge element circuit inside, so malfunctioning module separates not impact of the stacked SPWM modulation of carrier wave pyramidal wave, only carrier wave pyramidal wave phase shift SPWM impacted.So, analyze for convenient, only carrier wave pyramidal wave phase shift SPWM is analyzed.If during N+1 H electric bridge element circuit series connection, the carrier frequency of this chain type SVG control system is 1/T
c, the sampling period is T
s, when carrier wave is unipolarity, sampling period T
s=T
c/ [2 (N+1)].The below separates rear two kinds of adjusting method commonly used for the H electric bridge element circuit that is out of order.
First method: T
cConstant, T
sChange
For simplifying the analysis, before selecting fault, establishing described multi-electrical level inverter number is n+1=6, the sampling period T of each phase H bridge power model
s=T
c/ 12, at 0/6T
s, T
s/ 7T
s, 2T
s/ 8T
s, 3T
s/ 9T
s, 4T
s/ 10T
s, 5T
s/ 11T
sMoment sample modulation ripple, and relatively generate corresponding trigger impulse, as shown in Figure 5.
If a certain H electric bridge element circuit because of break down separated rear (supposing that first H electric bridge element circuit is separated), as modulation strategy not being adjusted accordingly, remains the pulse generate sequential of N non-fault H electric bridge element circuit as shown in Fig. 6 (a).As can be seen from the figure the sampling interval between H electric bridge element circuit 0 and H electric bridge element circuit 2 is 2T
sBut the sampling interval between other power H electric bridge element circuit is T
s, this does not obviously meet the basic principle of phase-shifted SPWM modulation.The harmonic content of the output voltage of SVG device must increase.
If carrier cycle is constant, be still T
c, but with the sampling period at T
cIn readjust.As shown in Fig. 6 (b), after fault, the quantity of described multi-electrical level inverter becomes 5, thereby the sampling period after modulation is T
s'=T
c/ 10.To produce like this complete phase-shifting carrier wave output pulse of N=5.
The method is adjusted the switch modulation strategy of this phase phase-shifted SPWM by the sampling period that changes fault phase (a phase H bridge power model at the H electric bridge element circuit place of breaking down).Concerning this phase, can play good regulating action.
Second method: T
cChange T
sConstant
When first H electric bridge element circuit breaks down when separated, keep sampling period T
sConstant, adjust carrier wave pyramidal wave cycle of this phase.As shown in Figure 7.
After adjusting, the carrier cycle of fault phase is Tc ', keeps the carrier cycle Tc of other healthy phases constant.Pulse sequence after adjustment is as shown in Fig. 7 (b): at 0/5Ts, Ts/6Ts, 2Ts/7Ts, 3Ts/8Ts, 4Ts/9Ts constantly, a sample modulation ripple generates the trigger impulse of H bridge power model.Like this, obtained the phase-shifted SPWM Sampling waveform of complete N=5.Sampling period not change before and after malfunctioning module separates due to fault phase after fault is separated, still can guarantee the synchronism of three phase circuit sampling.
The method of work of described minute phase current independent controling circuit.See Fig. 3, in figure
,
,
, collect the three-phase voltage momentary value for Acquisition Circuit;
,
,
The voltage-phase of the three phase mains that traces into for PLL;
,
,
, be each phase wattless current reference value;
,
,
Average voltage for the dc bus capacitor of each phase H bridge power model;
The voltage reference value of dc bus capacitor;
,
,
For Acquisition Circuit collects the three phase circuit momentary value; Can calculate the reference signal of SVG output voltage by corresponding PI controller, more further calculate the voltage reference value of corresponding each phase wattless current reference value and dc bus capacitor according to Instantaneous Power Theory.The concrete grammar of the voltage reference value of each phase wattless current reference value of above-mentioned acquisition and dc bus capacitor sees document for details: Yang Jun, Wang Zhaoan, Qiu Guanyuan. a kind of detecting method [J] of Harmonic in Single-phase Circuit and wattless current, electrotechnics journal, 1996 (3), 11 (3): 42-46; Jiang Bin, Yan Gangfeng, Zhao Guangzhou. single-phase circuit Instantaneous Harmonic and real time sampling idle new method [J]. power system automation, 2000 (11): 36-39.
See Fig. 1-3, on embodiment 1 basis, the method for work at described titanium blower fan comprises:
The method of work of described chain type SVG device comprises the steps:
A: when a H electric bridge element circuit damages, corresponding this H electric bridge element circuit of auto by pass circuit bypass;
B: described pulse-width modulation circuit is on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of described damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model;
The method of work of described minute phase current independent controling circuit comprises the steps:
(1) by phaselocked loop according to the momentary value of voltage of the described three phase mains of input to follow the tracks of the voltage-phase of described three phase mains;
(2) voltage-phase that draws according to described phaselocked loop calculates the cosine amount of this voltage-phase and multiplies each other with a wattless current reference value, to obtain actual wattless current output;
(3) voltage-phase that draws according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
(4) be used for first electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Obviously, above-described embodiment is only for example of the present invention clearly is described, and is not to be restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all mode of executions exhaustive.And these belong to apparent variation or the change that spirit of the present invention extended out and still are among protection scope of the present invention.
Claims (3)
1. titanium blower fan comprises: be suitable for driving the motor that fan blade rotates in air duct, be fixed with motor shroud outside described motor, motor shroud is provided with induced air pipe, leaves the space as ventilation flue between motor and motor shroud; Characterized by further comprising: the three-phase power input end connection one at described motor is suitable for correcting the chain type SVG device of power factor;
Described chain type SVG device comprises:
The multi-electrical level inverter of H electric bridge multi-type, it is made of the three-phase H bridge power model that is connected in described three phase mains, wherein, sets up at least one standby H electric bridge element circuit in every phase H bridge power model;
The auto by pass circuit is located at the output terminal of each H electric bridge element circuit, and when a H electric bridge element circuit is damaged, with this H electric bridge element circuit bypass;
Sample circuit is suitable for gathering the momentary value of the voltage and current of described three phase mains;
Minute phase current independent controling circuit, it is connected with described sample circuit is suitable for calculating according to the momentary value of the voltage and current of described three phase mains modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Pulse-width modulation circuit is connected with described minute phase current independent controling circuit, is used for modulation ratio M and phase angle according to described sinusoidal modulation wave
The carrier wave pyramidal wave phase shift SPWM that adopts between each H electric bridge element circuit is controlled; Namely, after the H electric bridge element circuit bypass that damages, this pulse-width modulation circuit is suitable on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model.
2. titanium blower fan according to claim 1, is characterized in that, described minute phase current independent controling circuit comprises:
Phaselocked loop, according to the momentary value of the voltage of described three phase mains to follow the tracks of the voltage-phase of described three phase mains;
The given module of wattless current is suitable for calculating the cosine amount of this voltage-phase and multiplying each other with a wattless current reference value according to the voltage-phase that described phaselocked loop draws, to obtain actual wattless current output;
The given module of active current, be suitable for calculating according to the voltage-phase that described phaselocked loop draws the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
The transient current tracking module, be used for first the electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
3. the method for work of titanium blower fan according to claim 2 comprises:
The method of work of described chain type SVG device comprises the steps:
A: when a H electric bridge element circuit damages, corresponding this H electric bridge element circuit of auto by pass circuit bypass;
B: described pulse-width modulation circuit is on constant basis of the sampling period that keeps described sample circuit, change the carrier frequency of described carrier wave pyramidal wave phase shift SPWM of a phase H bridge power model at the H electric bridge element circuit place of described damage, to obtain the Sampling waveform of the carrier wave pyramidal wave phase shift SPWM corresponding with remaining H electric bridge element circuit quantity in this phase H bridge power model;
The method of work of described minute phase current independent controling circuit comprises the steps:
(1) by phaselocked loop according to the momentary value of voltage of the described three phase mains of input to follow the tracks of the voltage-phase of described three phase mains;
(2) voltage-phase that draws according to described phaselocked loop calculates the cosine amount of this voltage-phase and multiplies each other with a wattless current reference value, to obtain actual wattless current output;
(3) voltage-phase that draws according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, simultaneously subtract each other and pass through according to the voltage reference value of the average voltage of the dc bus capacitor of described each phase H bridge power model and a direct current lateral capacitance and multiply each other with described sinusoidal quantity again after PI controls, export with the active current that obtains reality;
(4) be used for first electric current stack with the given module of described wattless current and the given module output of active current, then deduct the transient current in described three phase mains, and by controller to calculate modulation ratio M and the phase angle of the required sinusoidal modulation wave of described pulse-width modulation circuit
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210539556.9A CN103089669B (en) | 2012-12-13 | 2012-12-13 | A kind of titanium blower fan and method of work |
| CN201510399951.5A CN105179272A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510400211.9A CN105162130A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510512135.0A CN105134625A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor and work method |
| CN201510510967.9A CN105114340A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting of power factors of power grid |
| CN201510400327.2A CN105003447A (en) | 2012-12-13 | 2012-12-13 | Working method of titanium fan |
| CN201510512196.7A CN105134626A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210539556.9A CN103089669B (en) | 2012-12-13 | 2012-12-13 | A kind of titanium blower fan and method of work |
Related Child Applications (6)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400211.9A Division CN105162130A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510512135.0A Division CN105134625A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor and work method |
| CN201510510967.9A Division CN105114340A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting of power factors of power grid |
| CN201510399951.5A Division CN105179272A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510400327.2A Division CN105003447A (en) | 2012-12-13 | 2012-12-13 | Working method of titanium fan |
| CN201510512196.7A Division CN105134626A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103089669A true CN103089669A (en) | 2013-05-08 |
| CN103089669B CN103089669B (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510399951.5A Pending CN105179272A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510512135.0A Withdrawn CN105134625A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor and work method |
| CN201210539556.9A Expired - Fee Related CN103089669B (en) | 2012-12-13 | 2012-12-13 | A kind of titanium blower fan and method of work |
| CN201510512196.7A Withdrawn CN105134626A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor |
| CN201510400327.2A Pending CN105003447A (en) | 2012-12-13 | 2012-12-13 | Working method of titanium fan |
| CN201510510967.9A Withdrawn CN105114340A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting of power factors of power grid |
| CN201510400211.9A Pending CN105162130A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510399951.5A Pending CN105179272A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
| CN201510512135.0A Withdrawn CN105134625A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor and work method |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510512196.7A Withdrawn CN105134626A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting power grid power factor |
| CN201510400327.2A Pending CN105003447A (en) | 2012-12-13 | 2012-12-13 | Working method of titanium fan |
| CN201510510967.9A Withdrawn CN105114340A (en) | 2012-12-13 | 2012-12-13 | Titanium fan suitable for correcting of power factors of power grid |
| CN201510400211.9A Pending CN105162130A (en) | 2012-12-13 | 2012-12-13 | Titanium fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105003447A (en) * | 2012-12-13 | 2015-10-28 | 蒋红娟 | Working method of titanium fan |
| CN109270878A (en) * | 2018-12-11 | 2019-01-25 | 天水电气传动研究所有限责任公司 | Underground pipe gallery environmental monitoring and draft fan control system |
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| CN109270878A (en) * | 2018-12-11 | 2019-01-25 | 天水电气传动研究所有限责任公司 | Underground pipe gallery environmental monitoring and draft fan control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105162130A (en) | 2015-12-16 |
| CN105003447A (en) | 2015-10-28 |
| CN103089669B (en) | 2015-09-09 |
| CN105179272A (en) | 2015-12-23 |
| CN105114340A (en) | 2015-12-02 |
| CN105134626A (en) | 2015-12-09 |
| CN105134625A (en) | 2015-12-09 |
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