CN105780061A - Chain type SVG device capable of improving utilization rate of transformer - Google Patents
Chain type SVG device capable of improving utilization rate of transformer Download PDFInfo
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- CN105780061A CN105780061A CN201610244526.3A CN201610244526A CN105780061A CN 105780061 A CN105780061 A CN 105780061A CN 201610244526 A CN201610244526 A CN 201610244526A CN 105780061 A CN105780061 A CN 105780061A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
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Abstract
The invention relates to a chain type SVG device capable of improving the utilization rate of a transformer. The chain type SVG device comprises an H bridge multi-union type multilevel inverter, an automatic bypass channel circuit, a sampling circuit and a split-phase current independent control circuit; the H bridge multi-union type multilevel inverter is composed of three phases of H bridge power modules connected to a three-phase power source, wherein at least one standby H bridge unit circuit is additionally arranged in each phase of H bridge power module; the multilevel inverter can carry out automatic bypass operation on failure H bridge unit circuits; the automatic bypass channel circuit is arranged at the output ends of the H bridge unit circuits, and when one H bridge unit circuit is damaged, the H bridge unit circuit is subject to bypass operation; the sampling circuit is suitable for collecting momentary value of voltage and current of the three-phase power source; and the split-phase current independent control circuit is connected with the sampling circuit and suitable for working out modulation ratios and phase angles of sinusoidal modulation waves needed by a pulse width modulation circuit according to the momentary value of the voltage and the current of the three-phase power source.
Description
Technical field
The present invention relates to the chain type SVG device of a kind of utilization rate correcting the power factor (PF) of electrical network, raising transformator.
Background technology
The circuit-board industry development of current China is swift and violent, owing to the waste water that board production enterprise produces often containing the substantial amounts of metallics with recovery value, and heavy metals exceeding standard is serious, etching solution particularly also has substantial amounts of copper ion, its discharge can bring great harm to environment, so how extracting the copper ion in etching solution, the production efficiency improving cathode copper is the technical barrier of this area.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and is suitable to improve electrolytic efficiency, the ion-exchange membrane electrolyzer chain type SVG device of the convenient utilization rate taking out the power factor (PF) correcting electrical network of precipitating metal, raising transformator.
In order to solve the problems referred to above, the invention provides a kind of ion-exchange membrane electrolyzer, including: cell body, it is provided with ion exchange membrane in described cell body, described cell body is divided into anode chamber and cathode chamber by described ion exchange membrane, the bottom of described cell body also sets one and goes out funnel, and described in go out funnel and be connected with described cathode chamber；
Described go out funnel and a drain pipe be connected to discharge electrolysis waste solution；
Described go out funnel bottom set one and be suitable to collect the collecting bin of metal precipitated out, and the entrance of this collecting bin with described go out funnel bottom be connected.
Further, central processing unit, the bottom of described collecting bin is provided with discharge port, bottom in collecting bin sets a weight sensor to detect the weight of the metal in collecting bin, this weight sensor is connected with described central processing unit, setting a valve in the porch of described collecting bin, this valve and discharge port are by central processing unit control；
Wherein, when described weight sensor detects that the metal that described collecting bin is collected reaches constant weight, described central processing unit cuts out described valve, and opens the metal that discharge port unloads in collecting bin.
Further, in order to the reactive power that ion-exchange membrane electrolyzer is operationally produced compensates, improving the load capacity of electrical network, the three-phase power input end at described ion-exchange membrane electrolyzer connects a chain type SVG device being suitable to correct power factor (PF).
Described chain type SVG device includes:
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 standby H electrical bridge element circuit 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 H electrical bridge multi-type multi-electrical level inverter normal operation, makes described chain type SVG device continue up to the purpose correcting power factor (PF),
Auto by pass circuit, is located at the outfan of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, is bypassed by this H electrical bridge element circuit；
Sample circuit, is suitable to gather the instantaneous value of the voltage and current of described three phase mains；
Dividing phase current independent controling circuit, its instantaneous value being suitable to the voltage and current according to described three phase mains being connected with described sample circuit calculates the Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ；
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit being controlled than M and phase angle δ according to described Sine Modulated wave modulation；Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis that the sampling period keeping described sample circuit is 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 impulse modulation waveform of the carrier triangular wave phase shift SPWM corresponding with remaining H electrical bridge element circuit quantity in this phase H bridge power model.
Further, described point of phase current independent controling circuit, including:
Phaselocked loop, according to the instantaneous value of the voltage of described three phase mains to follow the tracks of the voltage-phase of described three phase mains；
Reactive current gives module, is suitable to calculate the cosine amount of this voltage-phase according to the voltage-phase that described phaselocked loop draws and be multiplied with a reactive current reference value, to obtain the reactive current output of reality；
Watt current gives module, be suitable to calculate the sinusoidal quantity of this voltage-phase according to the voltage-phase that described phaselocked loop draws, the average voltage of DC bus capacitor and the voltage reference value of a DC bus capacitor according to described each phase H bridge power model subtract each other and are multiplied with described sinusoidal quantity after PI control again simultaneously, to obtain the watt current output of reality；
Transient current tracing module, for first by the electric current superposition of given to given for described reactive current module and watt current module output, then the transient current in described three phase mains is deducted, and by controller to calculate Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ.
Compared with prior art, the ion-exchange membrane electrolyzer of the present invention has the advantage that (1) utilizes described chain type SVG device, corrects the problem owing to the electrolytic process of ion-exchange membrane electrolyzer causes the power factor (PF) of electrical network to decline, improves the utilization rate of transformator；(2) in described chain type SVG device, standby H-bridge unit circuit it is provided with, during energy further H-bridge unit circuit malfunctions, the H-bridge unit circuit auto by pass of this fault, and ensure H electrical bridge multi-type multi-electrical level inverter normal operation, that is, grid power factor is corrected；(3) and when this H bridge power model is damaged, it is not necessary to maintenance down, it is ensured that stablizing of electrical network；(4) pulse-width modulation circuit regulates the modulating wave of the phase H bridge power model being damaged, and effectively avoids harmonic wave and produces；(5) by dividing the compensation problem of phase current independence control realization three phase mains imbalance output；(6) by collecting bin, precipitating metal is collected, can realize precipitating out how many how much collection, accomplish electrolysis and collect two work separately, mutually independently；When the metal in collecting bin reaches constant weight, close valve closing and prevent liquid from flowing out, it is ensured that etching solution proceeds reaction in electrolysis bath, but carry out discharging work simultaneously, when discharging terminates, close discharge port, control valve and open the metal continuing to collect precipitation, drastically increase production efficiency；(7) after the metal of etching solution is complete by electrolysis, waste liquid is discharged from drain pipe, will not wash out the metal of collecting bin in discharge process.
The present invention also to solve the technical problem that being to provide one is suitable to improve electrolytic efficiency, the method for work of the convenient ion-exchange membrane electrolyzer taking out precipitating metal.
In order to solve the problems referred to above, the method for work of the ion-exchange membrane electrolyzer of the present invention, including:
1. the metal that the cell reaction of described ion-exchange membrane electrolyzer precipitates out slips into out funnel, and enters collecting bin；
2. when described weight sensor detects that the metal that described collecting bin is collected reaches constant weight, described central processing unit cuts out described valve, and opens the metal that discharge port unloads in collecting bin；
3. after discharging, closing described discharge port and valve, described ion-exchange membrane electrolyzer continues cell reaction.
The present invention also to solve the technical problem that being to provide one is suitable to improve electrolytic efficiency, the method for work of the power factor of counterion membrane electrolysis cells.
In order to solve the problems referred to above, the method for work of the ion-exchange membrane electrolyzer of the present invention, including:
A kind of method of work being suitable to chain type SVG device, including:
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 that the sampling period keeping described sample circuit is 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 impulse modulation waveform of the carrier triangular wave phase shift SPWM corresponding with remaining H electrical bridge element circuit quantity 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 instantaneous 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 reactive current reference value, to obtain the reactive current output of reality；
(3) voltage-phase drawn according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, the average voltage of DC bus capacitor and the voltage reference value of a DC bus capacitor according to described each phase H bridge power model subtract each other and are multiplied with described sinusoidal quantity after PI control again simultaneously, to obtain the watt current output of reality；
(4) for first by the electric current superposition of given to given for described reactive current module and watt current module output, then the transient current in described three phase mains is deducted, and by controller to calculate Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ.
Compared with prior art; the method of work of the ion-exchange membrane electrolyzer of the present invention has the advantage that (1) is by setting up at least one standby H electrical bridge element circuit in every phase H bridge power model; when making H bridge power model be damaged, auto by pass malfunctioning module, it is not necessary to maintenance down；(2) pulse-width modulation circuit regulates the modulating wave of the phase H bridge power model being damaged, and effectively avoids harmonic wave and produces；(3) by dividing the compensation problem of phase current independence control realization three phase mains imbalance output.(4) by collecting bin, precipitating metal is collected, can realize precipitating out how many how much collection, accomplish electrolysis and collect two work separately, mutually independently；When the metal in collecting bin reaches constant weight, close valve closing and prevent liquid from flowing out, it is ensured that etching solution proceeds reaction in electrolysis bath, but carry out discharging work simultaneously, when discharging terminates, close discharge port, control valve and open the metal continuing to collect precipitation, drastically increase production efficiency；(5) after the metal of etching solution is complete by electrolysis, waste liquid is discharged from drain pipe, will not wash out the metal of collecting bin in discharge process.
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, below according to specific embodiment and in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein
The structural representation of the ion-exchange membrane electrolyzer of Fig. 1 present invention；
The ion-exchange membrane electrolyzer of Fig. 2 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 the H electrical bridge multi-type of Fig. 3 present invention；
The structured flowchart of point phase current independent controling circuit of Fig. 4 present invention；
The oscillogram of the carrier triangular wave homophase monolayer stacking SPWM modulation of Fig. 5 present invention；
The generation H electrical bridge unit module of Fig. 6 present invention break down before pulse generate sequential；
The first fault H electrical bridge unit module of Fig. 7 present invention be bypassed after pulse generate sequential；
The second fault H electrical bridge unit module of Fig. 8 present invention be bypassed after pulse generate sequential.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in detail:
Embodiment 1
As shown in Figure 1, a kind of ion-exchange membrane electrolyzer, including: cell body 1, it is provided with ion exchange membrane in described cell body, described cell body is divided into anode chamber and cathode chamber by described ion exchange membrane, it is characterized in that, the bottom of described cell body also sets one and goes out funnel 2, and described in go out funnel 2 and be connected with described cathode chamber；Described go out funnel 2 be connected to discharge electrolysis waste solution with a drain pipe 3；Described go out funnel 2 bottom set one and be suitable to collect the collecting bin 4 of metal precipitated out, and the entrance of this collecting bin 4 with described go out funnel 2 bottom be connected.
Described ion-exchange membrane electrolyzer also includes: central processing unit, the bottom of described collecting bin 4 is provided with discharge port 4-1, bottom in collecting bin 4 sets a weight sensor to detect the weight of the metal in collecting bin 4, this weight sensor is connected with described central processing unit, a valve 4-2, this valve 4-2 and discharge port is set by central processing unit control in the porch of described collecting bin 4；Wherein, when described weight sensor detects that the metal that described collecting bin 4 is collected reaches constant weight, described central processing unit cuts out described valve 4-2, and opens discharge port 4-1 and unload the metal in collecting bin 4.
Set the drain valve 3-1 of a control electrolysis waste solution discharge at described drain pipe 3, namely when cell reaction, close this drain valve 3-1.Three-phase power input end at described ion-exchange membrane electrolyzer connects a chain type SVG device being suitable to correct power factor (PF).
As Figure 2-3, described chain type SVG device includes:
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 standby H electrical bridge element circuit in every phase H bridge power model；
Auto by pass circuit, is located at the outfan of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, is bypassed by this H electrical bridge element circuit；
Sample circuit, is suitable to gather the instantaneous value of the voltage and current of described three phase mains, and this instantaneous value includes the amplitude of voltage and current, cycle；
Dividing phase current independent controling circuit, its instantaneous value being suitable to the voltage and current according to described three phase mains being connected with described sample circuit calculates the Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ；
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit being controlled than M and phase angle δ according to described Sine Modulated wave modulation；Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis that the sampling period keeping described sample circuit is 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 impulse modulation waveform of the carrier triangular wave phase shift SPWM corresponding with remaining H electrical bridge element circuit quantity in this phase H bridge power model.
See Fig. 4, described point of phase current independent controling circuit, including:
Phaselocked loop, according to the instantaneous value of the voltage of described three phase mains to follow the tracks of the voltage-phase of described three phase mains；
Reactive current gives module, is suitable to calculate the cosine amount of this voltage-phase according to the voltage-phase that described phaselocked loop draws and be multiplied with a reactive current reference value, to obtain the reactive current output of reality；
Watt current gives module, be suitable to calculate the sinusoidal quantity of this voltage-phase according to the voltage-phase that described phaselocked loop draws, the average voltage of DC bus capacitor and the voltage reference value of a DC bus capacitor according to described each phase H bridge power model subtract each other and are multiplied with described sinusoidal quantity after PI control again simultaneously, to obtain the watt current output of reality；
Transient current tracing module, for first by the electric current superposition of given to given for described reactive current module and watt current module output, then the transient current in described three phase mains is deducted, and by controller to calculate Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ.
Wherein reference current is desired compensation electric current, and direct voltage reference value is desired bucking voltage.
Described pulse-width modulation circuit relates to SPWM pulse width modulation method, this SPWM pulse width modulation method is to do modulating wave with a sine wave, do carrier wave with the triangular wave of F times of Sine Modulated wave frequency and carry out waveform comparison and one group of amplitude producing is equal, width is proportional to the rectangular pulse train of sinusoidal modulation wave and carrys out equivalent sine wave, thus controlling the break-make of switching device (i.e. switching device 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 for single H electrical bridge element circuit employing stacked SPWM control, this modulator approach, output harmonic wave content is little, switching frequency is low, and can solve the problem that inversion efficiency is low 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 compares with same sinusoidal modulation wave, produce N group SPWM control impulse waveform to go respectively to control N number of H bridge, make each H electrical bridge element circuit all export the SPWM voltage waveform that fundamental voltage is identical, then again the SPWM voltage waveform that this N number of H electrical bridge element circuit exports is overlapped 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 monolayer and multilayer layer stacked SPWM modulation method, and this both of which can reach the technique effect of this patent.
Carrier triangular wave monolayer stacked SPWM modulation method can be divided into again carrier triangular wave anti-phase monolayer stacking SPWM modulation method (opposite in phase of two carrier triangular wave) and carrier triangular wave homophase monolayer stacking SPWM modulation method (phase place of two carrier triangular wave is identical) according to the phase relation of two triangular carriers.Carrier triangular wave anti-phase monolayer stacking SPWM modulation method and carrier triangular wave homophase monolayer stacking SPWM modulation method this in two modulator approach do not have what quality point, the present invention adopts carrier triangular wave homophase monolayer stacking SPWM modulation method.
In carrier triangular wave homophase monolayer stacking SPWM modulation method, two carrier triangular waveWithPhase place identical, its work wave is as shown in Figure 5.WhereinWithFor the carrier triangular wave of the upper and lower layer of transverse axis,For sinusoidal modulation wave.Compare with triangular wave with sinusoidal wave, at sine waveOutput SPWM pulse can be produced, at sine wave more than the part of triangular waveThe zero pulse of output voltage can be produced less than the part of triangular wave.Due toWithIt is homophase, say, thatWithIt is asymmetric with abscissa line, so by the sinusoidal wave comparison with triangular wave, the positive half cycle of the output voltage SPWM waveform of generation and negative semiaxis differ.
Appoint and take a H electrical bridge element circuit and study, from power perspective analysis.IfFor 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:, it is seen then that just could alter that, by changing H electrical bridge element circuit output voltage size, phase current size and the angle between them, the active power that H bridge absorbs.Because phase currentSize 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 output modulation than 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 reactive power, and lower floor controls mainly to regulate the reasonable distribution gained merit between this mutually each H bridge, it is ensured that DC capacitor voltage balances.The method of top level control of the present invention adopts a point phase current independently to control, calculate desired modulation wave modulation ratio and phase angle, it is that SIN 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 gained merit between each H electrical bridge element circuit.
The three-phase dc side of chain type SVG is absent from coupled relation, thus can realize individual-phase control, three-phase system is compensated respectively, balance system and unbalanced system all can be had reasonable compensation effect.The control strategy proposed in leading portion, its top level control adopts the full decoupled control of current status, and transient response is fast, good stability, but situation when only considered three-phase equilibrium during controller design, do not consider the unbalanced problem of three-phase system.Power grid quality investigation is shown, more or less there is the asymmetric of phase place or amplitude in line voltage, say, that in a practical situation, three-phase system is unbalanced mostly.
Auto by pass circuit, adopts auto by pass technology, and auto by pass technology be exactly directly by the bypass of fault power module AC, thus realizing separating of malfunctioning module and device.Auto by pass is realized by arranging a bypass mechanism at the outlet side of each power unit module.
The outfan at each H electrical bridge element circuit can be adopted to be provided with a relay, utilize the normally opened fault H electrical bridge element circuit that realizes with normally off of control to separate with this phase H bridge power model；Rectifier bridge and IGCT, the outfan of each H electrical bridge element circuit can also be adopted to be connected to the rectifier bridge of two pairs of diode compositions, so IGCT is under forward voltage drop all the time.When monitoring system detects power model internal fault, block IGBT pulse immediately, and trigger turn on thyristors, it is achieved bypass separates；Or employing bidirectional thyristor.
After a certain phase H bridge power model has fault H electrical bridge element circuit to be bypassed, if the pulsing of the sinusoidal modulation signal of pulse-width modulation circuit output sends also according to time properly functioning, and the output that this chain type SVG controls system only has N number of H electrical bridge element circuit output voltage superposition, harmonic content will increase.Therefore, for remaining N number of non-faulting H electrical bridge element circuit, modulation strategy need to do corresponding adjustment.
Because the stacked SPWM of carrier triangular wave simply works inside single H electrical bridge element circuit, therefore malfunctioning module separates the stacked SPWM modulation not impact of carrier triangular wave, only carrier triangular wave phase shift SPWM is impacted.So, analyze in order to convenient, only carrier triangular wave phase shift SPWM is analyzed.If during N+1 H electrical bridge element circuit series connection, it is 1/T that this chain type SVG controls the carrier frequency of systemc, the sampling period is Ts, when carrier wave is unipolarity, sampling period Ts=Tc/[2(N+1)].Method of adjustment that fault H electrical bridge element circuit separation latter two conventional is given below.
First method: TcConstant, TsChange
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 models=Tc/ 12, at 0/6Ts、Ts/7Ts、2Ts/8Ts、3Ts/9Ts、4Ts/10Ts、5Ts/11TsSample modulation ripple of moment, and compare generation trigger pulse accordingly, as shown in Figure 6.
If a certain H electrical bridge element circuit is because of break down separated rear (assuming that first H electrical bridge element circuit is separated), if modulation strategy not being adjusted accordingly, then the pulse remaining N number of non-faulting H electrical bridge element circuit generates sequential such 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 2Ts, but the sampling interval between other power H electrical bridge element circuits is Ts, this does not substantially meet the ultimate principle of phase-shifted SPWM modulation.The harmonic content of the output voltage of SVG device necessarily increases.
If carrier cycle is constant, remain as TcBut, by the sampling period at TcInside 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 Ts’=Tc/10.So will produce the complete phase-shifting carrier wave output pulse of N=5.
The method adjusts the switch modulation strategy of this phase phase-shifted SPWM by changing the sampling period of fault phase (a phase H bridge power model at the H electrical bridge element circuit place broken down).For this phase, it is possible to play good adjustment effect.
Second method: TcChange, TsConstant
When first H electrical bridge element circuit breaks down separated, keep sampling period TsConstant, adjust the carrier triangular period of wave 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 such 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 triggering pulse of H bridge power model.So, the phase-shifted SPWM impulse modulation waveform of complete N=5 is obtained.Owing to the sampling period of fault phase does not change before and after malfunctioning module separates, after fault reconstruction, still ensure that the synchronicity that three-phase current is sampled.
The method of work of described point of phase current independent controling circuit.See in Fig. 4, figure、、, collect three-phase voltage instantaneous value for Acquisition Circuit；、、Voltage-phase for the PLL three phase mains traced into；、、, for each phase reactive current reference value；、、Average voltage for the DC bus capacitor of each phase H bridge power model；The voltage reference value of DC bus capacitor；、、Three-phase current instantaneous value is collected for Acquisition Circuit；The reference signal of SVG output voltage can be calculated by corresponding PI controller, calculate the voltage reference value of corresponding each phase reactive current reference value and DC bus capacitor according further to Instantaneous Power Theory.The concrete grammar of the voltage reference value of each phase reactive current reference value of above-mentioned acquisition 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 reactive 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]. Automation of Electric Systems, 2000 (11): 36-39.
Embodiment 2
See Fig. 1, on the basis of embodiment 1, the method for work of described ion-exchange membrane electrolyzer, including:
The metal of the cell reaction precipitation 1. stating ion-exchange membrane electrolyzer slips into out funnel 2, and enters collecting bin 4；
2. described weight sensor detects that the metal that described collecting bin 4 is collected reaches during constant weight described central processing unit and closes described valve 4-2, and opens discharge port 4-1 and unload the metal in collecting bin 4；
3. after material, closing described discharge port 4-1 and valve 4-2, described ion-exchange membrane electrolyzer continues cell reaction.
Embodiment 3
On the basis of embodiment 1, the method for work of described ion-exchange membrane electrolyzer, including:
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 that the sampling period keeping described sample circuit is 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 impulse modulation waveform of the carrier triangular wave phase shift SPWM corresponding with remaining H electrical bridge element circuit quantity 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 instantaneous 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 reactive current reference value, to obtain the reactive current output of reality；
(3) voltage-phase drawn according to described phaselocked loop calculates the sinusoidal quantity of this voltage-phase, the average voltage of DC bus capacitor and the voltage reference value of a DC bus capacitor according to described each phase H bridge power model subtract each other and are multiplied with described sinusoidal quantity after PI control again simultaneously, to obtain the watt current output of reality；
(4) for first by the electric current superposition of given to given for described reactive current module and watt current module output, then the transient current in described three phase mains is deducted, and by controller to calculate Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ.
Claims (1)
1. the ion-exchange membrane electrolyzer method of work of chain type SVG device, ion-exchange membrane electrolyzer includes: cell body, it is provided with ion exchange membrane in described cell body, described cell body is divided into anode chamber and cathode chamber by described ion exchange membrane, it is characterized in that, the bottom of described cell body also sets one and goes out funnel, and described in go out funnel and be connected with described cathode chamber；
Described go out funnel and a drain pipe be connected to discharge electrolysis waste solution；
Described go out funnel bottom set one and be suitable to collect the collecting bin of metal precipitated out, and the entrance of this collecting bin with described go out funnel bottom be connected；
Ion-exchange membrane electrolyzer also includes: central processing unit, and the bottom of described collecting bin is provided with discharge port, sets a valve in the porch of described collecting bin, and this valve and discharge port are by central processing unit control；
Three-phase power input end at described ion-exchange membrane electrolyzer connects a chain type SVG device being suitable to correct power factor (PF)；
The method of work of described chain type SVG device, including:
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 standby H electrical bridge element circuit in every phase H bridge power model；
Auto by pass circuit, is located at the outfan of each H electrical bridge element circuit, and when a H electrical bridge element circuit is damaged, is bypassed by this H electrical bridge element circuit；
Sample circuit, is suitable to gather the instantaneous value of the voltage and current of described three phase mains；
Dividing phase current independent controling circuit, its instantaneous value being suitable to the voltage and current according to described three phase mains being connected with described sample circuit calculates the Sine Modulated wave modulation needed for described pulse-width modulation circuit than M and phase angle δ；
Pulse-width modulation circuit, is connected with described point of phase current independent controling circuit, for the carrier triangular wave phase shift SPWM adopted between each H electrical bridge element circuit being controlled than M and phase angle δ according to described Sine Modulated wave modulation；Namely, when after the H electrical bridge element circuit bypass damaged, this pulse-width modulation circuit is suitable on the basis that the sampling period keeping described sample circuit is 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 impulse modulation waveform of the carrier triangular wave phase shift SPWM corresponding with remaining H electrical bridge element circuit quantity in this phase H bridge power model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610244526.3A CN105780061A (en) | 2012-12-13 | 2012-12-13 | Chain type SVG device capable of improving utilization rate of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610244526.3A CN105780061A (en) | 2012-12-13 | 2012-12-13 | Chain type SVG device capable of improving utilization rate of transformer |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210540714.2A Division CN103103558B (en) | 2012-12-13 | 2012-12-13 | A kind of ion-exchange membrane electrolyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105780061A true CN105780061A (en) | 2016-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610244526.3A Withdrawn CN105780061A (en) | 2012-12-13 | 2012-12-13 | Chain type SVG device capable of improving utilization rate of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105780061A (en) |
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2012
- 2012-12-13 CN CN201610244526.3A patent/CN105780061A/en not_active Withdrawn
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Application publication date: 20160720 |