CN105239106A - Chain type SVG (static var generator) device for correctable power factor for three-phase power supply - Google Patents
Chain type SVG (static var generator) device for correctable power factor for three-phase power supply Download PDFInfo
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- CN105239106A CN105239106A CN201510738113.6A CN201510738113A CN105239106A CN 105239106 A CN105239106 A CN 105239106A CN 201510738113 A CN201510738113 A CN 201510738113A CN 105239106 A CN105239106 A CN 105239106A
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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
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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
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Abstract
The invention relates to a chain type SVG (static var generator) device for a correctable power factor for a three-phase power supply. The chain type SVG device comprises an H bridge multi-union type multi-level inverter, an automatic bypass circuit, a sampling circuit, a split-phase current independent control circuit and a pulse width modulating circuit, wherein the automatic bypass circuit is arranged at an output end of each H bridge unit circuit; when one H bridge unit circuit is damaged, the damaged H bridge unit circuit is bypassed; the sampling circuit is suitable for acquiring instantaneous values of voltage and current of the three-phase power supply; when the damaged H bridge unit circuit is bypassed, on the basis of keeping a sampling period of the sampling circuit unchanged, the pulse width modulating circuit is suitable for changing carrier wave frequency of carrier wave triangular wave phase-shifting SPWM (sinusoidal pulse width modulation) of a one-phase H bridge power module on which the damaged H bridge unit circuit is located so as to obtain pulse modulating waveform of carrier wave triangular wave phase-shifting SPWM corresponding to quantity of residual H bridge unit circuits in the phase bridge power module.
Description
Technical field
The present invention relates to a kind of chain type SVG device of three-phase supply by rectifiable power factor (PF) being applicable to the electrolyzer of titanium negative plate.
Background technology
The circuit-board industry development of current China is swift and violent, owing to often containing a large amount of metallicses with recovery value in the waste water that board production enterprise produces, and heavy metals exceeding standard is serious, particularly also has a large amount of cupric ions in etching solution, its discharge can bring great harm to environment, so how to extract the cupric ion in etching solution, the production efficiency improving electrolytic copper is the technical barrier of this area, and traditional electrolyzer is very single, cannot electrolysis various metals.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of chain type SVG device of three-phase supply by rectifiable power factor (PF) being applicable to the electrolyzer of titanium negative plate.
The electrolyzer being applicable to titanium negative plate of the present invention, comprising: cell body, is provided with ion-exchange membrane in described cell body, and described cell body is divided into anolyte compartment and cathode compartment by described ion-exchange membrane, between described anolyte compartment and cathode compartment, be provided with titanium negative plate; The bottom of described cell body also establishes one to go out funnel, and described in go out funnel and be connected with described cathode compartment;
Described go out funnel be connected to discharge electrolysis waste solution with a drain pipe;
Described go out the bottom of the funnel collecting bin of establishing one to be suitable for collecting the metal of separating out, and the entrance of this collecting bin with described go out the bottom of funnel be connected.
Further, central processing unit, the bottom of described collecting bin is provided with discharge opening, bottom in collecting bin establishes a weight sensor to detect the weight of the metal in collecting bin, this weight sensor is connected with described central processing unit, establish a valve in the ingress of described collecting bin, this valve and discharge opening are controlled by central processing unit;
Wherein, when described weight sensor detects that metal that described collecting bin is collected reaches certainweight, described central processing unit cuts out described valve, and opens discharge opening and unload metal in collecting bin.
Further, in order to the wattless power operationally produced the electrolyzer being applicable to titanium negative plate compensates, improve the load capacity of electrical network, connect at the described three-phase power input end being applicable to the electrolyzer of titanium negative plate the chain type SVG device that is suitable for correcting power factor (PF).
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 supply, 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 (PF),
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 supply;
Divide phase current independent controling circuit, what it was connected with described sample circuit is suitable for the modulation ratio M and the phasing degree 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 supply
;
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 phasing degree
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 pulsed modulation 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 supply to follow the tracks of the voltage-phase of described three-phase supply;
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 wattful 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 wattful 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 wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Compared with prior art, the electrolyzer tool being applicable to titanium negative plate of the present invention has the following advantages: (1) utilizes described chain type SVG device, correct the problem because the electrolytic process of the electrolyzer being applicable to titanium negative plate causes the power factor (PF) of electrical network to decline, improve 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 modulating 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 supply compensation problem that imbalance exports; (6) by collecting bin, precipitating metal is collected, can realize separating out how many how much collection, accomplish electrolysis and collect two work separately, mutually independently; When the metal in collecting bin reaches certainweight, shut-off valve prevents liquid from flowing out, and ensures that etching solution proceeds reaction in electrolyzer, but carry out discharging work simultaneously, when discharging terminates, close discharge opening, control valve is opened and is continued to collect the metal of separating out, and drastically increases production efficiency; (7) after the metal of etching solution is complete by electrolysis, waste liquid is discharged from drain pipe, can not wash out the metal of collecting bin in discharge process; (8) electrolysis can also go out nickel by titanium negative plate, add the efficiency of electrolysis.
The technical problem that the present invention also will solve is to provide one and is suitable for improving electrolytic efficiency, the convenient method of work being applicable to the electrolyzer of titanium negative plate of taking out precipitating metal.
In order to solve the problem, the method for work being applicable to the electrolyzer of titanium negative plate of the present invention, comprising:
1. the metal that the electrolytic reaction being applicable to the electrolyzer of titanium negative plate described in is separated out slips into out funnel, and enters collecting bin;
2. when described weight sensor detects that metal that described collecting bin is collected reaches certainweight, described central processing unit cuts out described valve, and opens discharge opening and unload metal in collecting bin;
3., after discharging, close described discharge opening and valve, described in be applicable to titanium negative plate electrolyzer continue electrolytic reaction.
The technical problem that the present invention also will solve is to provide one and is suitable for improving electrolytic efficiency, compensates the method for work being applicable to the power factor of the electrolyzer of titanium negative plate.
In order to solve the problem, the method for work being applicable to the electrolyzer of titanium negative plate 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 pulsed modulation 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 supply of input to follow the tracks of the voltage-phase of described three-phase supply;
(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 wattful current output of reality;
(4) for first the electric current that given for described wattless current module and the given module of wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Compared with prior art, the method of work tool being applicable to the electrolyzer of titanium negative plate 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 modulating 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 supply compensation problem that imbalance exports.(4) by collecting bin, precipitating metal is collected, can realize separating out how many how much collection, accomplish electrolysis and collect two work separately, mutually independently; When the metal in collecting bin reaches certainweight, shut-off valve prevents liquid from flowing out, and ensures that etching solution proceeds reaction in electrolyzer, but carry out discharging work simultaneously, when discharging terminates, close discharge opening, control valve is opened and is continued to collect the metal of separating out, and drastically increases production efficiency; (5) after the metal of etching solution is complete by electrolysis, waste liquid is discharged from drain pipe, can not wash out the metal of collecting bin in discharge process.
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
Fig. 1 structural representation being applicable to the electrolyzer of titanium negative plate of the present invention;
Fig. 2 electrolyzer being applicable to titanium negative plate of the present invention connects the structural representation of three-phase supply and chain type SVG device;
The circuit structure diagram of the multi-electrical level inverter of Fig. 3 H electrical bridge multi-type of the present invention;
The structured flowchart of Fig. 4 of the present invention point of phase current independent controling circuit;
The oscillogram of the stacked SPWM modulation of Fig. 5 carrier triangular wave of the present invention homophase individual layer;
Pulse generate sequential before Fig. 6 generation H electrical bridge of the present invention unit module breaks down;
Pulse generate sequential after Fig. 7 the first fault H electrical bridge unit module of the present invention is bypassed;
Pulse generate sequential after Fig. 8 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 electrolyzer being applicable to titanium negative plate, comprising: cell body 1, is provided with ion-exchange membrane in described cell body, and described cell body is divided into anolyte compartment and cathode compartment by described ion-exchange membrane, between described anolyte compartment and cathode compartment, be provided with titanium negative plate; The bottom of described cell body also establishes one to go out funnel 2, and described in go out funnel 2 and be connected with described cathode compartment;
Described go out funnel 2 be connected to discharge electrolysis waste solution with a drain pipe 3;
Described go out the bottom of funnel 2 collecting bin 4 of establishing one to be suitable for collecting the metal of separating out, and the entrance of this collecting bin 4 with described go out the bottom of funnel 2 be connected.
The described electrolyzer being applicable to titanium negative plate also comprises: central processing unit, the bottom of described collecting bin 4 is provided with discharge opening 4-1, bottom in collecting bin 4 establishes a weight sensor to detect the weight of the metal in collecting bin 4, this weight sensor is connected with described central processing unit, establish a valve 4-2 in the ingress of described collecting bin 4, this valve 4-2 and discharge opening are controlled by central processing unit;
Wherein, when described weight sensor detects that metal that described collecting bin 4 is collected reaches certainweight, described central processing unit cuts out described valve 4-2, and opens discharge opening 4-1 and unload metal in collecting bin 4.
Establish the bleed valve 3-1 of a control electrolysis waste solution discharge at described drain pipe 3, namely when electrolytic reaction, close this bleed valve 3-1.
The chain type SVG device that one is suitable for correcting power factor (PF) is connected at the described three-phase power input end being applicable to the electrolyzer of titanium negative plate.
As Figure 2-3, 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 supply, 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 supply, 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 phasing degree 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 supply
;
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 phasing degree
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 pulsed modulation 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. 4, described point of phase current independent controling circuit, comprising:
Phaselocked loop, according to the momentary value of the voltage of described three-phase supply to follow the tracks of the voltage-phase of described three-phase supply;
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 wattful 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 wattful 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 wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree 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 modulating wave with a sine wave, doubly do that carrier wave carries out waveform comparison and one group of amplitude producing is equal to the choppy sea of Sine Modulated 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 trip switch device (switch 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 setting pulse 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 5.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 choppy sea with sinusoidal wave
the part being greater than choppy sea can produce and export SPWM pulse, at sine wave
the part being less than choppy sea 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 choppy sea, 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 wattful power that H electrical bridge element circuit absorbs is:
, visible, the wattful 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 texture of layering: top level control mainly determines total meritorious and wattless power, and lower floor controls mainly to regulate the properly distributed 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 phasing degree of the modulating wave of expectation, be that sinusoidal function is superimposed upon on the modulating wave of this H electrical bridge element circuit by the error quantization of each bridge DC side voltage, the modulating 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 equilibrium system 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 side, thus realizes being separated of malfunctioning module and device.Auto by pass is realized by arranging a bypass mechanism at the outgoing side of each power unit module.
Can adopt and be provided with a rly. 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 transmission of the sinusoidal modulation signal that pulse-width modulation circuit exports still sends according to during normal operation, and the output of this chain type SVG Controlling 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 Controlling 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 inflation 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 tripping pulse of generation, as shown in Figure 6.
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. 7 (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 ultimate 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. 7 (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 effect 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 wave period of this phase.As shown in Figure 8.
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. 8 (b): in 0/5Ts, Ts/6Ts, 2Ts/7Ts, 3Ts/8Ts, 4Ts/9Ts moment, and a sample modulation ripple generates the tripping pulse of H bridge power model.Like this, the phase-shifted SPWM pulsed modulation 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 tri-phase current is sampled still can be ensured.
The method of work of described point of phase current independent controling circuit.See Fig. 4, in figure
,
,
, collect three-phase voltage momentary value for Acquisition Circuit;
,
,
for the voltage-phase of the three-phase supply 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 tri-phase current 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 detection method [J] of Harmonic in Single-phase Circuit and wattless current, electrotechnology journal, 1996 (3), 11 (3): 42-46; Jiang Bin, Yan Gangfeng, Zhao Guangzhou. single phase circuit Instantaneous Harmonic and real time sampling idle novel method [J]. Automation of Electric Systems, 2000 (11): 36-39.
Embodiment 2
See Fig. 1, on the basis of embodiment 1, described in be applicable to the method for work of the electrolyzer of titanium negative plate, comprising:
1. the metal that the electrolytic reaction stating the electrolyzer being applicable to titanium negative plate is separated out slips into out funnel 2, and enters collecting bin 4;
2. when described weight sensor detects that metal that described collecting bin 4 is collected reaches certainweight, described central processing unit cuts out described valve 4-2, and opens discharge opening 4-1 and unload metal in collecting bin 4;
3. material after, close described discharge opening 4-1 and valve 4-2, described in be applicable to titanium negative plate electrolyzer continue electrolytic reaction.
Embodiment 3
On the basis of embodiment 1, described in be applicable to the method for work of the electrolyzer of titanium negative plate, 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 pulsed modulation 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 supply of input to follow the tracks of the voltage-phase of described three-phase supply;
(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 wattful current output of reality;
(4) for first the electric current that given for described wattless current module and the given module of wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree 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 embodiments.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 (4)
1. a three-phase supply chain type SVG device for rectifiable power factor (PF) for the electrolyzer of titanium negative plate, is characterized in that
Comprise:
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 supply, 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 supply;
Divide phase current independent controling circuit, what it was connected with described sample circuit is suitable for the modulation ratio M and the phasing degree 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 supply
;
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 phasing degree
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 pulsed modulation 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;
Adopt and be provided with a rly. 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.
2. chain type SVG device according to claim 1, is characterized in that, described point of phase current independent controling circuit, comprising:
Phaselocked loop, according to the momentary value of the voltage of described three-phase supply to follow the tracks of the voltage-phase of described three-phase supply;
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 wattful 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 wattful 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 wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
3. the method for work of chain type SVG device according to claim 2, comprising:
1. the metal that the electrolytic reaction being applicable to the electrolyzer of titanium negative plate described in is separated out slips into out funnel, and enters collecting bin;
2. when described weight sensor detects that metal that described collecting bin is collected reaches certainweight, described central processing unit cuts out described valve, and opens discharge opening and unload metal in collecting bin;
3., after discharging, close described discharge opening and valve, described in be applicable to titanium negative plate electrolyzer continue electrolytic reaction.
4. method of work according to claim 3, also comprises:
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 pulsed modulation 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 supply of input to follow the tracks of the voltage-phase of described three-phase supply;
(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 wattful current output of reality;
(4) for first the electric current that given for described wattless current module and the given module of wattful current export being superposed, then the momentary current in described three-phase supply is deducted, and by controller to calculate modulation ratio M and the phasing degree of the sinusoidal modulation wave needed for described pulse-width modulation circuit
.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210539405.3A CN103103575B (en) | 2012-12-13 | 2012-12-13 | A kind of electrolyzer being applicable to titanium negative plate |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210539405.3A Division CN103103575B (en) | 2012-12-13 | 2012-12-13 | A kind of electrolyzer being applicable to titanium negative plate |
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| CN105239106A true CN105239106A (en) | 2016-01-13 |
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| CN201210539405.3A Active CN103103575B (en) | 2012-12-13 | 2012-12-13 | A kind of electrolyzer being applicable to titanium negative plate |
| CN201510738113.6A Withdrawn CN105239106A (en) | 2012-12-13 | 2012-12-13 | Chain type SVG (static var generator) device for correctable power factor for three-phase power supply |
| CN201510738884.5A Withdrawn CN105177638A (en) | 2012-12-13 | 2012-12-13 | Working method of chain-type SVG (static var generator) for three-phase power supplies capable of correcting power factors |
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| CN201210539405.3A Active CN103103575B (en) | 2012-12-13 | 2012-12-13 | A kind of electrolyzer being applicable to titanium negative plate |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510738884.5A Withdrawn CN105177638A (en) | 2012-12-13 | 2012-12-13 | Working method of chain-type SVG (static var generator) for three-phase power supplies capable of correcting power factors |
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Cited By (1)
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| CN105790285A (en) * | 2016-04-27 | 2016-07-20 | 中车株洲电力机车研究所有限公司 | SVG control method and SVG control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488713B (en) * | 2019-08-30 | 2021-08-10 | 国网湖南省电力有限公司 | Control method of chain type SVG interphase hedging test system |
| CN110438529A (en) * | 2019-09-05 | 2019-11-12 | 广西铟泰科技有限公司 | High purity indium preparation facilities |
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| CN105790285A (en) * | 2016-04-27 | 2016-07-20 | 中车株洲电力机车研究所有限公司 | SVG control method and SVG control system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105177638A (en) | 2015-12-23 |
| CN103103575B (en) | 2015-10-28 |
| CN103103575A (en) | 2013-05-15 |
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