CN103089669B - A kind of titanium blower fan and method of work - Google Patents
A kind of titanium blower fan and method of work Download PDFInfo
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- CN103089669B CN103089669B CN201210539556.9A CN201210539556A CN103089669B CN 103089669 B CN103089669 B CN 103089669B CN 201210539556 A CN201210539556 A CN 201210539556A CN 103089669 B CN103089669 B CN 103089669B
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 17
- 239000010936 titanium Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title description 39
- 238000005070 sampling Methods 0.000 claims description 22
- 230000010363 phase shift Effects 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000007257 malfunction Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 13
- 230000001052 transient effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004458 analytical method Methods 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 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
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 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
-
- 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 present invention relates to a kind of titanium blower fan, comprising: drive the motor that fan blade rotates, the three-phase power input end of described motor connects the chain type SVG device that is suitable for correcting power factor; Described chain type SVG device comprises: the multi-electrical level inverter of H electrical bridge multi-type, auto by pass circuit, sample circuit, point phase current independent controling circuit, pulse-width modulation circuit; The present invention utilizes described chain type SVG device, corrects the problem because machine operation causes the power factor of electrical network to decline, improves the utilization ratio of transformer; H-bridge unit circuit for subsequent use is provided with in described chain type SVG device, can again a H-bridge unit circuit malfunctions time, the H-bridge unit circuit auto by pass of this fault, and ensure that H electrical bridge multi-type multi-electrical level inverter normally works, that is, grid power factor is corrected.
Description
Technical field
The present invention relates to a kind of titanium blower fan and method of work.
Background technique
At present, some chemical plant of China use titanium blower fan in chlor-alkali production, and 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 effective compensation is carried out to electrical network, and when corresponding compensating circuit or module break down, ensure that continuous seepage is the technical barrier of related domain without the need to shutdown maintenance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of titanium blower fan being 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: in air duct, be suitable for the motor driving fan blade to rotate, have motor shroud at described motor extenal fixation, motor shroud is provided with induced air pipe, leaves space as ventilation flue between motor and motor shroud; The chain type SVG device that one is suitable for correcting power factor is connected at the three-phase power input end of described motor;
Described chain type SVG device comprises:
The multi-electrical level inverter of H electrical bridge multi-type, it is made up of the three-phase H bridge power model being connected to described three phase mains, wherein, sets up at least one H electrical bridge element circuit for subsequent use in every phase H bridge power model; The H-bridge unit circuit that this multi-electrical level inverter energy auto by pass breaks down, to ensure that H electrical bridge multi-type multi-electrical level inverter normally works, makes described chain type SVG device continue to reach the object of correcting power factor,
Auto by pass circuit, is located at the output terminal of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, by this H electrical bridge element circuit bypass;
Sample circuit, is suitable for the momentary value of the voltage and current gathering described three phase mains;
Divide phase current independent controling circuit, what it was connected with described sample circuit is suitable for the modulation ratio M and the phase angle that calculate the sinusoidal modulation wave needed for described pulse-width modulation circuit according to the momentary value of the voltage and current of described three phase mains
;
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for according to the modulation ratio M of described sinusoidal modulation wave and phase angle
the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit is controlled; Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis keeping the sampling period of described sample circuit constant, change the carrier frequency of the described carrier triangular wave phase shift SPWM of a phase H bridge power model at the H electrical bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier triangular wave phase shift SPWM corresponding with H electrical bridge element circuit quantity remaining in this phase H bridge power model.
Further, described point of phase current independent controling circuit, comprising:
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, the voltage-phase being suitable for drawing according to described phaselocked loop calculates the cosine amount of this voltage-phase and is multiplied with a wattless current reference value, exports to obtain actual wattless current;
The given module of active current, the voltage-phase being suitable for drawing according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, to subtract each other with the voltage reference value of a DC bus capacitor according to the average voltage of the DC bus capacitor of described each phase H bridge power model simultaneously and be multiplied with described sinusoidal quantity again after PI controls, to obtain the active current output of reality;
Transient current tracing module, for first the electric current that given for described wattless current module and the given module of active current export being superposed, then the transient current in described three phase mains is deducted, and by controller to calculate modulation ratio M and the phase angle of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Compared with prior art, titanium blower fan tool of the present invention has the following advantages: (1) utilizes described chain type SVG device, corrects the problem because machine operation causes the power factor of electrical network to decline, improves the utilization ratio of transformer; (2) in described chain type SVG device, H-bridge unit circuit for subsequent use is provided with, can again a H-bridge unit circuit malfunctions time, the H-bridge unit circuit auto by pass of this fault, and ensure that H electrical bridge multi-type multi-electrical level inverter normally works, that is, grid power factor is corrected; (3) and when this H bridge power model is damaged, without the need to maintenance down, ensure that the stable of electrical network; (4) pulse-width modulation circuit regulates the modulated wave of the phase H bridge power model be damaged, and effectively avoids harmonic wave and produces; (5) by dividing the phase current independence control realization three phase mains compensation problem that imbalance exports; (6) the present invention is 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 being suitable for the titanium blower fan correcting grid power factor.
In order to solve the problem, the method for work of titanium blower fan of the present invention, comprising:
Be suitable for a method of work for chain type SVG device, comprise:
A: when a H electrical bridge element circuit damages, this H electrical bridge element circuit of corresponding auto by pass circuits bypass;
B: described pulse-width modulation circuit is on the basis keeping the sampling period of described sample circuit constant, change the carrier frequency of the described carrier triangular wave phase shift SPWM of a phase H bridge power model at the H electrical bridge element circuit place of described damage, to obtain the Sampling waveform of the carrier triangular wave phase shift SPWM corresponding with H electrical bridge element circuit quantity remaining in this phase H bridge power model;
The method of work of described point of 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 drawn according to described phaselocked loop calculates the cosine amount of this voltage-phase and is multiplied with a wattless current reference value, exports to obtain actual wattless current;
(3) voltage-phase drawn according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, to subtract each other with the voltage reference value of a DC bus capacitor according to the average voltage of the DC bus capacitor of described each phase H bridge power model simultaneously and be multiplied with described sinusoidal quantity again after PI controls, to obtain the active current output of reality;
(4) for first the electric current that given for described wattless current module and the given module of active current export being superposed, then the transient current in described three phase mains is deducted, and by controller to calculate modulation ratio M and the phase angle of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Compared with prior art, the method of work tool of described titanium blower fan of the present invention has the following advantages: (1) is by setting up at least one H electrical bridge element circuit for subsequent use in every phase H bridge power model, when H bridge power model is damaged, auto by pass malfunctioning module, without the need to maintenance down; (2) pulse-width modulation circuit regulates the modulated wave of the phase H bridge power model be damaged, and effectively avoids harmonic wave and produces; (3) by dividing the phase current independence control realization three phase mains compensation problem that imbalance exports.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, 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 electrical bridge multi-type of the present invention;
The structured flowchart of Fig. 3 of the present invention point of phase current independent controling circuit;
The oscillogram of the stacked SPWM modulation of Fig. 4 carrier triangular wave of the present invention homophase individual layer;
Pulse generate sequential before Fig. 5 generation H electrical bridge of the present invention unit module breaks down;
Pulse generate sequential after Fig. 6 the first fault H electrical bridge unit module of the present invention is bypassed;
Pulse generate sequential after Fig. 7 the second fault of the present invention H electrical bridge unit module is bypassed.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
Embodiment 1
As shown in Figure 1, a kind of titanium blower fan, comprising: in air duct, be suitable for the motor driving fan blade to rotate, have motor shroud at described motor extenal fixation, motor shroud is provided with induced air pipe, leaves space as ventilation flue between motor and motor shroud; The chain type SVG device that one is suitable for correcting power factor is connected at the three-phase power input end of described motor;
As shown in Figure 2, described chain type SVG device comprises:
The multi-electrical level inverter of H electrical bridge multi-type, it is made up of the three-phase H bridge power model being connected to described three phase mains, wherein, sets up at least one H electrical bridge element circuit for subsequent use in every phase H bridge power model;
Auto by pass circuit, is located at the output terminal of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, by this H electrical bridge element circuit bypass;
Sample circuit, is suitable for the momentary value of the voltage and current gathering described three phase mains, and this momentary value comprises amplitude, the cycle of voltage and current;
Divide phase current independent controling circuit, what it was connected with described sample circuit is suitable for the modulation ratio M and the phase angle that calculate the sinusoidal modulation wave needed for described pulse-width modulation circuit according to the momentary value of the voltage and current of described three phase mains
;
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for according to the modulation ratio M of described sinusoidal modulation wave and phase angle
the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit is controlled; Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis keeping the sampling period of described sample circuit constant, change the carrier frequency of the described carrier triangular wave phase shift SPWM of a phase H bridge power model at the H electrical bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier triangular wave phase shift SPWM corresponding with H electrical bridge element circuit quantity remaining in this phase H bridge power model.
See Fig. 3, described point of phase current independent controling circuit, comprising:
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, the voltage-phase being suitable for drawing according to described phaselocked loop calculates the cosine amount of this voltage-phase and is multiplied with a wattless current reference value, exports to obtain actual wattless current;
The given module of active current, the voltage-phase being suitable for drawing according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, to subtract each other with the voltage reference value of a DC bus capacitor according to the average voltage of the DC bus capacitor of described each phase H bridge power model simultaneously and be multiplied with described sinusoidal quantity again after PI controls, to obtain the active current output of reality;
Transient current tracing module, for first the electric current that given for described wattless current module and the given module of active current export being superposed, then the transient current in described three phase mains is deducted, and by controller to calculate modulation ratio M and the phase angle of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Wherein reference current is the offset current expected, direct voltage reference value is the offset voltage expected.
Described pulse-width modulation circuit relates to SPWM pulse width modulation method, this SPWM pulse width modulation method does modulated wave with a sine wave, doubly do that carrier wave carries out waveform comparison and one group of amplitude producing is equal to the pyramidal wave of sinusoidal modulation wave frequency with F, the rectangular pulse train that width is proportional to sinusoidal modulation wave carrys out equivalent sine wave, thus the break-make of control switch device (switching device namely in multi-electrical level inverter).
The hybrid algo-rithm that the present invention adopts carrier triangular wave phase shift SPWM to control and the stacked SPWM of carrier triangular wave controls: as a whole, carrier triangular wave phase shift SPWM is adopted to control between each H electrical bridge element circuit, and the method that single H electrical bridge element circuit adopts stacked SPWM to control, this modulator approach, output harmonic wave content is little, switching frequency is low, and can solve the low problem of inversion efficiency well.
Carrier triangular wave phase shift SPWM control methods, refer to for N number of H electrical bridge element circuit, adopt N number of phase place different, but the carrier triangular wave that frequency is identical with amplitude and same sinusoidal modulation wave compare, produce N group SPWM control impuls waveform to go respectively to control N number of H bridge, make each H electrical bridge element circuit all export the identical SPWM voltage waveform of fundamental voltage, and then the SPWM voltage waveform that this N number of H electrical bridge element circuit exports is carried out superposing and synthesizes SPWM voltage with multiple levels waveform.
The Initial phase of N number of carrier triangular wave should remove an angle successively, and according to bipolarity carrier triangular wave, this angle is
; If unipolarity carrier triangular wave, angle is
.
Carrier triangular wave stacked SPWM control methods is the SPWM modulation method of Application comparison a kind of multi-electrical level inverter early.The stacked SPWM modulation method of carrier triangular wave can be divided into two kinds, i.e. the stacked SPWM modulation method of individual layer and multilayer layer stacked SPWM modulation method, and these two kinds of methods can reach the technique effect of this patent.
Carrier triangular wave individual layer stacked SPWM modulation method can be divided into again the anti-phase individual layer of carrier triangular wave stacked SPWM modulation method (phase place of two carrier triangular wave is contrary) and carrier triangular wave homophase individual layer stacked SPWM modulation method (phase place of two carrier triangular wave is identical) according to the phase relationship of two triangular carriers.The anti-phase individual layer of carrier triangular wave stacked SPWM modulation method and the stacked SPWM modulation method of carrier triangular wave homophase individual layer this in two modulator approach do not have what quality point, the present invention adopts the stacked SPWM modulation method of carrier triangular wave homophase individual layer.
In the stacked SPWM modulation method of carrier triangular wave homophase individual layer, two carrier triangular wave
with
phase place identical, its work wave is as shown in Figure 4.Wherein
with
for the carrier triangular wave of the upper and lower layer of transverse axis,
for sinusoidal modulation wave.Compare, at sine wave with pyramidal wave with sinusoidal wave
the part being greater than pyramidal wave can produce and export SPWM pulse, at sine wave
the part being less than pyramidal wave can produce the zero pulse of output voltage.Due to
with
homophase, that is
with
be asymmetric with abscissa line, so by sinusoidal wave comparing with pyramidal wave, the positive half cycle of the output voltage SPWM waveform of generation is not identical with negative semiaxis.
Appoint and get a H electrical bridge element circuit and study, from power perspective analysis.If
for the output voltage of H electrical bridge element circuit,
for phase current,
for the angle of output voltage and phase current, then the active power that H electrical bridge element circuit absorbs is:
, visible, the active power of H bridge absorption just can be changed by changing H electrical bridge element circuit output voltage size, phase current size and the angle between them.Because phase current
size and Orientation fix, so the size and Orientation of H electrical bridge element circuit output voltage can only be changed, namely correspond to pulse-width modulation circuit export modulation ratio M and phase shifting angle
.
The control strategy of chain type SVG adopts the control structure of layering: top level control mainly determines total meritorious and wattless power, and lower floor controls mainly to regulate the reasonable distribution of gaining merit between this mutually each H bridge, ensures DC capacitor voltage balance.The method of top level control of the present invention adopts a point 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 electrical bridge element circuit by the error quantization of each bridge DC side voltage, the modulated wave phase place of each H electrical bridge element circuit is finely tuned, regulates the distribution of gaining merit between each H electrical bridge element circuit.
There is not coupled relation in the three-phase dc side of chain type SVG, thus can realize individual-phase control, compensate respectively three-phase system, all can have reasonable compensation effect to balance sysmte and unbalanced system.The control strategy proposed in leading portion, its top level control adopts the full decoupled control of current status, and transient response is fast, and good stability, but situation when only considered three-phase equilibrium during Controller gain variations, do not consider the unbalanced problem of three-phase system.Show power grid quality investigation, more or less there is the asymmetric of phase place or amplitude in line voltage, that is in a practical situation, three-phase system is unbalanced mostly.
Auto by pass circuit, adopt auto by pass technology, auto by pass technology is exactly direct by the bypass of fault power module AC, thus realizes being separated of malfunctioning module and device.Auto by pass is realized by arranging a bypass mechanism at the outlet side of each power unit module.
Can adopt and be provided with a relay at the output terminal of each H electrical bridge element circuit, utilize and control often to open to be separated with this phase H bridge power model to realize fault H electrical bridge element circuit with normally off; Also can adopt rectifier bridge and thyristor, the output terminal of each H electrical bridge element circuit is connected to the rectifier bridge of two pairs of diodes compositions, so under thyristor is in forward voltage drop all the time.When supervisory system detects power model internal fault, block IGBT pulse immediately, and trigger turn on thyristors, realize bypass and be separated; Or employing bidirectional thyristor.
After having fault H electrical bridge element circuit to be bypassed in a certain phase H bridge power model, if the pulse of the sinusoidal modulation signal that pulse-width modulation circuit exports sends or send according to during normal operation, and the output of this chain type SVG control system only has N number of H electrical bridge element circuit output voltage to superpose, harmonic content will increase.Therefore, for remaining N number of non-faulting H electrical bridge element circuit, modulation strategy need do corresponding adjustment.
Because the stacked SPWM of carrier triangular wave just works in single H electrical bridge element circuit inside, therefore malfunctioning module is separated the stacked SPWM modulation of carrier triangular wave not impact, only impacts carrier triangular wave phase shift SPWM.So, conveniently analyze, only carrier triangular wave phase shift SPWM is analyzed.If during N+1 H electrical 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 conventional adjusting method of latter two is separated below to the H electrical bridge element circuit that is out of order.
First method: T
cconstant, T
schange
For simplifying the analysis, before selecting fault, if described multi-electrical level inverter number is n+1=6, then 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 compare the corresponding trigger impulse of generation, as shown in Figure 5.
If a certain H electrical bridge element circuit is because of break down separated rear (supposing that first H electrical bridge element circuit is separated), if not being adjusted accordingly modulation strategy, then remain the pulse generate sequential of N number of non-faulting H electrical bridge element circuit as shown in Fig. 6 (a).As can be seen from the figure the sampling interval between H electrical bridge element circuit 0 and H electrical bridge element circuit 2 is 2T
sbut the sampling interval between other power H electrical bridge element circuits 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
cbut, by the sampling period at T
cinside readjust.As shown in Fig. 6 (b), after fault, the quantity of described multi-electrical level inverter becomes 5, thus the sampling period after modulation is T
s'=T
c/ 10.So the complete phase-shifting carrier wave producing N=5 is exported pulse.
The method adjusts the switch modulation strategy of this phase phase-shifted SPWM by the sampling period changing fault phase (a phase H bridge power model at the H electrical bridge element circuit place of breaking down).Concerning this phase, good regulating action can be played.
Second method: T
cchange, T
sconstant
When first H electrical bridge element circuit breaks down separated, keep sampling period T
sconstant, adjust the carrier triangular period of wave of this phase.As shown in Figure 7.
After adjustment, 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): in 0/5Ts, Ts/6Ts, 2Ts/7Ts, 3Ts/8Ts, 4Ts/9Ts moment, and a sample modulation ripple generates the trigger impulse of H bridge power model.Like this, the phase-shifted SPWM Sampling waveform of complete N=5 is obtained.Because the sampling period of fault phase does not change before and after malfunctioning module is separated, after fault reconstruction, the synchronism that three phase circuit is sampled still can be ensured.
The method of work of described point of phase current independent controling circuit.See Fig. 3, in figure
,
,
, collect three-phase voltage momentary value for Acquisition Circuit;
,
,
for the voltage-phase of the three phase mains that PLL traces into;
,
,
, be each phase wattless current reference value;
,
,
for the average voltage of the DC bus capacitor of each phase H bridge power model;
the voltage reference value of DC bus capacitor;
,
,
for Acquisition Circuit collects three phase circuit momentary value; The reference signal of SVG output voltage can be calculated by corresponding PI controller, then calculate the voltage reference value of corresponding each phase wattless current reference value and DC bus capacitor according to Instantaneous Power Theory further.The concrete grammar of the voltage reference value of above-mentioned acquisition each phase wattless current reference value and DC bus capacitor refers to document: 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.
Embodiment 2
See Fig. 1-3, on the basis of embodiment 1, in the method for work of described titanium blower fan, comprising:
The method of work of described chain type SVG device comprises the steps:
A: when a H electrical bridge element circuit damages, this H electrical bridge element circuit of corresponding auto by pass circuits bypass;
B: described pulse-width modulation circuit is on the basis keeping the sampling period of described sample circuit constant, change the carrier frequency of the described carrier triangular wave phase shift SPWM of a phase H bridge power model at the H electrical bridge element circuit place of described damage, to obtain the Sampling waveform of the carrier triangular wave phase shift SPWM corresponding with H electrical bridge element circuit quantity remaining in this phase H bridge power model;
The method of work of described point of 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 drawn according to described phaselocked loop calculates the cosine amount of this voltage-phase and is multiplied with a wattless current reference value, exports to obtain actual wattless current;
(3) voltage-phase drawn according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, to subtract each other with the voltage reference value of a DC bus capacitor according to the average voltage of the DC bus capacitor of described each phase H bridge power model simultaneously and be multiplied with described sinusoidal quantity again after PI controls, to obtain the active current output of reality;
(4) for first the electric current that given for described wattless current module and the given module of active current export being superposed, then the transient current in described three phase mains is deducted, and by controller to calculate modulation ratio M and the phase angle of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the 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 exhaustive without the need to also giving all mode of executions.And these belong to spirit institute's apparent change of extending out of the present invention or change and are still among protection scope of the present invention.
Claims (1)
1. a titanium blower fan, comprising: in air duct, be suitable for the motor driving fan blade to rotate, have motor shroud at described motor extenal fixation, motor shroud is provided with induced air pipe, leaves space as ventilation flue between motor and motor shroud; Characterized by further comprising: connect at the three-phase power input end of described motor the chain type SVG device that is suitable for correcting power factor;
Described chain type SVG device comprises:
The multi-electrical level inverter of H electrical bridge multi-type, it is made up of the three-phase H bridge power model being connected to described three phase mains, wherein, sets up at least one H electrical bridge element circuit for subsequent use in every phase H bridge power model;
Auto by pass circuit, is located at the output terminal of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, by this H electrical bridge element circuit bypass;
Sample circuit, is suitable for the momentary value of the voltage and current gathering described three phase mains;
Divide phase current independent controling circuit, what it was connected with described sample circuit is suitable for the modulation ratio M and the phase angle that calculate the sinusoidal modulation wave needed for pulse-width modulation circuit according to the momentary value of the voltage and current of described three phase mains
;
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for according to the modulation ratio M of described sinusoidal modulation wave and phase angle
the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit is controlled; Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis keeping the sampling period of described sample circuit constant, change the carrier frequency of the described carrier triangular wave phase shift SPWM of a phase H bridge power model at the H electrical bridge element circuit place of this damage, to obtain the Sampling waveform of the carrier triangular wave phase shift SPWM corresponding with H electrical bridge element circuit quantity remaining in this phase H bridge power model.
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 |
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| 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 CN103089669A (en) | 2013-05-08 |
| CN103089669B true CN103089669B (en) | 2015-09-09 |
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Family Applications (7)
| 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 |
Family Applications After (4)
| 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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| Country | Link |
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| CN (7) | CN105179272A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179272A (en) * | 2012-12-13 | 2015-12-23 | 蒋红娟 | 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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| JPH11353830A (en) * | 1998-06-02 | 1999-12-24 | Fujitsu Ltd | Method and device for driving actuator of storage disk device |
| CN1281869C (en) * | 2004-07-14 | 2006-10-25 | 沈阳东方钛业有限公司 | Fan made from titanium |
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| CN105179272A (en) * | 2012-12-13 | 2015-12-23 | 蒋红娟 | Titanium fan |
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- 2012-12-13 CN CN201510399951.5A patent/CN105179272A/en active Pending
- 2012-12-13 CN CN201510512135.0A patent/CN105134625A/en not_active Withdrawn
- 2012-12-13 CN CN201210539556.9A patent/CN103089669B/en not_active Expired - Fee Related
- 2012-12-13 CN CN201510512196.7A patent/CN105134626A/en not_active Withdrawn
- 2012-12-13 CN CN201510400327.2A patent/CN105003447A/en active Pending
- 2012-12-13 CN CN201510510967.9A patent/CN105114340A/en not_active Withdrawn
- 2012-12-13 CN CN201510400211.9A patent/CN105162130A/en active Pending
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| CN102362426A (en) * | 2009-03-30 | 2012-02-22 | 新日本制铁株式会社 | Induction motor control device and induction motor group control system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103089669A (en) | 2013-05-08 |
| CN105162130A (en) | 2015-12-16 |
| CN105003447A (en) | 2015-10-28 |
| CN105179272A (en) | 2015-12-23 |
| CN105114340A (en) | 2015-12-02 |
| CN105134626A (en) | 2015-12-09 |
| CN105134625A (en) | 2015-12-09 |
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