CN205811511U - A kind of protection circuit of capacitive faults - Google Patents
A kind of protection circuit of capacitive faults Download PDFInfo
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- CN205811511U CN205811511U CN201620662137.8U CN201620662137U CN205811511U CN 205811511 U CN205811511 U CN 205811511U CN 201620662137 U CN201620662137 U CN 201620662137U CN 205811511 U CN205811511 U CN 205811511U
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Abstract
This utility model relates to the protection circuit of a kind of capacitive faults, and in electricity generation system, electricity generation system includes connecting DC source, semiconductor inverter by dc bus, and the inverter other end connects AC；The electric capacity with buffering and filter function it is in series with more than 2 or 2 between dc bus；Protection circuit includes sample circuit, comparator and reference voltage module；Sample circuit is attached with the point that concatenates of dc bus and series capacitance, and carries out voltage sample；Comparator connects sample circuit and reference voltage module respectively.During use, on the one hand it can cut off direct current supply path and the AC supply access of rear class of prime, the electric energy in DC side and AC in electricity generation system of on the other hand releasing, it is to avoid in electricity generation system, the electric energy of DC side and AC pours into remaining electric capacity.
Description
Technical field
This utility model relates to a kind of protection circuit, the protection circuit of a kind of capacitive faults, is particularly well-suited to new
In energy electricity generation system.
Background technology
Along with the efficiency of grid-connected power generation system requires little by little to improve, most important to the efficiency of grid-connected power generation system
The semiconductor power converter of core component and system line loss have higher requirement.And reduce electric current in circuit,
It it is one of the measure of most effective improving energy efficiency.Then the DC bus-bar voltage in grid-connected power generation system is the most gradually raised, from
600V is lifted to 1000V, is even improved 1500V, to reduce input current further, reduces line loss, promotes system
System efficiency.
Fig. 1 show typical grid-connected power generation system circuit block diagram, mainly by the DC source of grid-connected power generation system, electricity
Solving electric capacity CE1 and CE2, and semiconductor inverter three part composition, wherein the DC source of grid-connected power generation system is with follow-up
Semiconductor inverter is required for jumbo dc bus electrochemical capacitor and buffers and filter.The highest due to electrolysis condenser
Pressure for 500V, for meeting the requirement of the input voltage constantly raised, usual employing can be gone here and there by least 2 500V electrochemical capacitors
Connection, as shown in CE1 and CE2 in Fig. 1, is respectively connecting to dc bus (+) anode and dc bus (-) after CE1 and CE2 series connection
Negative terminal, then level is coupled to semiconductor inverter, generates electricity connecting AC.
For meeting 1500V input voltage or the requirement of higher input voltage, it is necessary to multiple 500V electrolysis condenser
Connect, such as 3,4 series connection or more series connection, as in figure 2 it is shown, many by electrochemical capacitor CE1, CE2 ... and CEn
Between bridging and dc bus after the series connection of individual electrochemical capacitor (+) anode and dc bus (-) negative terminal.
It addition, the semiconductor inverter in Fig. 1 and Fig. 2 can be single-phase inverter, it is also possible to for three-phase inverter.
Below first as a example by the grid-connected power generation system circuit of 2 electrochemical capacitors concatenation typical shown in Fig. 1, illustrate mesh
The safety failure of front grid-connected power generation system existence and life safety problem.
Broke down, when short circuit phenomenon occurs, as shown in Figure 3 when the electrochemical capacitor CE1 in Fig. 1 loses efficacy.Dc bus electricity
Pressure will the most all add to CE2, and in simultaneity factor, DC side and all of electric energy of AC all can gather to electrochemical capacitor
On CE2, electrochemical capacitor CE2 individually undertake, so can at least cause electrochemical capacitor CE2 over-voltage breakdown to burst, even smolder and
Phenomenon on fire, causes safety failure and personal safety.But, it is straight that such safety failure is but not enough to trigger electrochemical capacitor prime
Stream power supply and the protective measure action of semiconductor inverter rear class AC routine, cut off unidirectional current source and inverter ac side
Electric energy pour into normal electrolysis condenser CE2.
When CE2 breaks down, and short circuit phenomenon occurs, as shown in Figure 4, being also same case, DC bus-bar voltage will
Directly all adding to CE1, in simultaneity factor, DC side and all of electric energy of AC all can gather to electrochemical capacitor CE1,
Individually undertaken by electrochemical capacitor CE1, so can at least cause electrochemical capacitor CE1 over-voltage breakdown to burst, even smolder and on fire existing
As, cause safety failure and personal safety.But, such safety failure is also not enough to trigger electrochemical capacitor prime DC source
The protective measure action conventional with semiconductor inverter rear class AC, cuts off unidirectional current source and the electric energy of inverter ac side
Pour into electrolysis condenser CE1.
Also have another kind of situation that the over-voltage breakdown of electrochemical capacitor also can be caused to burst, ultimately result in and smolder and phenomenon on fire.
When electrochemical capacitor CE1 and CE2 elapses over time, and electrolyte can constantly volatilize, the capacitance of electrochemical capacitor is caused to reduce, but
It is the most different that CE1 and CE2 capacity reduces degree, even if using equalizer circuit, but electrochemical capacitor volume change is beyond equal piezoelectricity
After the limit of power on road, the voltage difference mutation that CE1 and CE2 also can be caused to undertake is big, the volume that one of them electrolysis condenser exceeds
Determine voltage 500V, cause the over-voltage breakdown of relevant electrochemical capacitor to burst phenomenon, also result in and smolder and phenomenon on fire, cause safety
Fault and personal safety.Same such safety failure is also not enough to trigger conventional protective measure action, cuts off direct current input
The electric energy of side and inverter ac side pours into the electrolysis condenser not lost efficacy.
Utility model content
The purpose of this utility model is to provide the protection circuit of a kind of capacitive faults, is mainly used in solving electricity generation system electricity
The safety problem that in road, the failure of removal of the electric capacity of DC side causes, during use, it can give the unidirectional current of prime electricity generation system
Source and rear class semiconductor inverter send triggering signal and implement electrochemical capacitor defencive function；When one of them in series capacitance
When electrochemical capacitor lost efficacy, on the one hand cut off direct current supply path and the AC supply access of rear class of prime, on the other hand let out
Put the electric energy in DC side and AC in electricity generation system, it is to avoid in electricity generation system, the electric energy of DC side and AC pours into remaining
Electric capacity, there is the phenomenon that bursts of over-voltage breakdown, to realize the protection to remaining electric capacity, it is to avoid occurs more serious safety former
Barrier and human safety issues.
For achieving the above object, this utility model is realized in.
The protection circuit of a kind of capacitive faults, in electricity generation system, described electricity generation system includes passing through dc bus
Connecting DC source, semiconductor inverter, the inverter other end connects AC；More than 2 or 2 tools it are in series with between dc bus
There is the electric capacity of buffering and filter function；It is characterized in that: described protection circuit includes sample circuit, comparator and reference voltage
Module；Wherein:
Described sample circuit is attached with the point that concatenates of dc bus and series capacitance, and carries out voltage sample；
Described comparator connects sample circuit and reference voltage module respectively, by judging the sampling that sample circuit gathers
Whether voltage exceedes the reference voltage range arranged in reference voltage module is done protection judgement, the most then trigger protection function.
The protection circuit of described capacitive faults, it is characterised in that: described defencive function includes being sent by comparator
Protection trigger the supply access of DC source of signal cut prime and the supply access of the AC of rear class.
The protection circuit of described capacitive faults, it is characterised in that: described defencive function includes being sent by comparator
Protection trigger signal and control bridging and the conducting of the transistor brachium pontis of dc bus in rear class semiconductor inverter, release and send out
Electric energy in DC side and AC in electricity system, it is to avoid in electricity generation system, the electric energy of DC side and AC pours into remaining electricity
Hold.
The protection circuit of described capacitive faults, it is characterised in that: described semiconductor inverter be single-phase inverter or
Three-phase inverter.
Capacitive faults protection circuit in the electricity generation system that the utility model proposes, can solve protection circuit and the dress of routine
Putting cannot the defect of identification capacitive faults, it is ensured that electricity generation system safe operation；The protection circuit simultaneously increased is simple and reliable easily
Realize, be the solution that a kind of cost performance is high.
Accompanying drawing explanation
Fig. 1 is existing grid-connected power generation system circuit block diagram.
Fig. 2 is the grid-connected power generation system circuit block diagram of existing multiple electrolysis condenser concatenation.
Fig. 3 is the grid-connected power generation system circuit block diagram under CE1 failure of removal short circuit.
Fig. 4 is the grid-connected power generation system circuit block diagram under CE2 failure of removal short circuit.
Fig. 5 is that this utility model protection circuit is applied to grid-connected power generation system circuit block diagram.
Fig. 6 is the internal circuit block diagram of protection circuit in this utility model.
Fig. 7 is the structural representation of this utility model embodiment 1.
Fig. 8 is the structural representation of this utility model embodiment 2.
Fig. 9 is the structural representation of this utility model embodiment 3.
Figure 10 is the structural representation of this utility model embodiment 4.
In figure: A: the DC source of grid-connected power generation system；M: dc bus (+)；N: dc bus (-)；C: quasiconductor is inverse
Become device (single-phase or three-phase inverter)；B: AC；1: protection circuit；11: trigger signal；21: electrochemical capacitor CE1；22: electrolysis
Electric capacity CE2；23: electrochemical capacitor CEn-1；24: electrochemical capacitor CEn；31: reference voltage Vref；32: comparator；33: sample circuit；
34: protection circuit；51: semiconductor inverter；52: drive circuit；53: panel；61: transistor Q1；62: transistor Q2；63:
Transistor Q3；64: transistor Q4；65: inductance L1；66: electric capacity C1；71: brachium pontis A；72: brachium pontis B；73: brachium pontis C；81: transistor
Qa1；82: transistor Qb1；83: transistor Qc1；84: transistor Qa2；85: transistor Qb2；86: transistor Qc2；91: inductance
La；92: inductance Lb；93: inductance Lc；94: electric capacity Ca；95: electric capacity Cb；96: electric capacity Cc.
Detailed description of the invention
The utility model discloses the protection circuit of a kind of DC generation side electrochemical capacitor fault, as shown in Figure 5: this protection
Circuit is by detecting the junction point voltage V of each series connection electrolysis electric capacity of DC bus-bar voltage Vinc1、Vc2、Vcn-1And Vcn, with protection
Protection point in circuit arranges scope and compares, to DC source and the rear level semiconductor inversion of prime grid-connected power generation system
Device sends triggering signal and implements electrochemical capacitor defencive function；When one of them electrochemical capacitor in series connection electrolysis electric capacity lost efficacy
Time, each junction point voltage can be beyond the protection domain arranged in protection circuit, and protection circuit will be to prime generation of electricity by new energy system
The DC source of system and rear class semiconductor inverter output " triggering signal ", on the one hand cut off direct current supply path and the rear class of prime
AC supply access, on the other hand control the transistor brachium pontis of bridging and dc bus in rear class semiconductor inverter the most simultaneously
Conducting, the electric energy in DC side and AC in electricity generation system of releasing, it is to avoid DC side and AC in electricity generation system
Electric energy pours into remaining electrochemical capacitor, and the phenomenon that over-voltage breakdown bursts occurs, and to realize the protection to remaining electrochemical capacitor, keeps away
Exempt from more serious safety failure and human safety issues.Semiconductor inverter shown in Fig. 5 can be single-phase inverter, also
It can be three-phase inverter.
For solving grid-connected power generation system bridges the safety problem that the electrochemical capacitor failure of removal of dc bus causes, this
Utility model proposes the protection circuit of a kind of dc bus electrochemical capacitor failure of removal, and concrete with grid-connected power generation system is connected
Mode as it is shown in fig. 7, wherein protection circuit one end and dc bus (+) voltage " Vin" and the junction point of each electrochemical capacitor
Vc2、……Vcn-1And VcnBeing connected, the other end is inverse with the quasiconductor of the DC source of the grid-connected power generation system of prime and rear class respectively
The driver becoming the panel in device or transistor is connected.
The protection circuit that the utility model proposes by sampling dc bus (+) voltage " Vin" and multiple series connection electrolysis electric capacity
Junction point voltage V corresponding between CE1, CE2 ... CEn-1 and CEnc2、……Vcn-1And Vcn, through the ratio within protection circuit
Relatively device, the protection domain that arrange internal with protection circuit compares judgement, when each junction point voltage is beyond the protection model arranged
After enclosing, protection circuit will export " triggering signal " to the DC source of prime DC power generation system and rear class semiconductor inverter,
On the one hand direct current supply path and the AC supply access of DC side, level semiconductor inversion after the most simultaneously controlling are cut off
The conducting of transistor brachium pontis between bridging and dc bus in device, with DC side in grid-connected power generation system of releasing and AC
Dump energy, it is to avoid in electricity generation system, the dump energy of DC side and AC pours into remaining electrochemical capacitor, occurs overvoltage to hit
Wear the phenomenon burst, cause safety failure and personal safety, to realize remaining electrochemical capacitor is protected, it is to avoid occur more
Serious safety failure and human safety issues.
Fig. 6 is the internal circuit block diagram of protection circuit, including voltage sampling circuit, reference voltage VrefAnd comparator
Three parts.The protection circuit that the utility model proposes by sampling dc bus (+) voltage " Vin" and each junction point of electrochemical capacitor
Voltage Vc2、……Vcn-1And VcnAfter, it is respectively connecting to comparator after sampled processing of circuit, then by comparator and reference voltage
VrefThe protection domain arranged compares judgement, when the protection domain that the sampled voltage of each junction point is arranged beyond protection circuit
Time, comparator will export " triggering signal " to the DC source of prime DC power generation system of prime and rear level semiconductor inversion
Device, on the one hand cuts off direct current supply path and the AC supply access of DC side, level semiconductor after the most simultaneously controlling
The conducting of the transistor brachium pontis of bridging and dc bus in inverter, with DC side in electricity generation system of releasing and the residue of AC
Electric energy, it is to avoid in electricity generation system, the dump energy of DC side and AC pours into remaining electrochemical capacitor, occurs over-voltage breakdown to explode
The phenomenon split, to realize protecting remaining electrochemical capacitor, it is to avoid occur more serious safety failure and personal safety to ask
Topic.
The wherein reference voltage V in Fig. 6refArrange protection domain for from central value be VrefVoltage change range, than
As from 50%VrefTo 150%VrefExcursion.
The wherein reference voltage V in Fig. 6refCan be fixing reference voltage, it is also possible to for Vin/ n, VinFor dc bus
Voltage, " n " is number n of bridging and the series connection electrolysis electric capacity of dc bus.Work as reference voltage Vref=VinDuring/n, reference voltage
VrefWill be along with DC bus-bar voltage VinChange and change, so protection circuit can be made to be more suitable on a large scale and input
Change in voltage is applied.
Wherein the point of the sampled voltage in Fig. 6 can need not to gather simultaneously dc bus (+) voltage VinWith series connection electrolysis electricity
Hold all each point voltage V of junction pointc2、……Vcn-1And VcnEven if only including fractional-sample point and can also realizing same guarantor
Protective function.
Wherein the comparator in Fig. 6 can realize multilevel iudge function by hardware, it is also possible to realizes comparing by software
Arbitration functions.
Embodiment 1
Fig. 7 is the block diagram of electrochemical capacitor fault secure circuit in a kind of single-phase new forms of energy DC power generation system band, wherein wraps
Include four parts: the DC source of grid-connected power generation system, electrochemical capacitor CE1 and CE2, semiconductor inverter and protection circuit.Electrolysis
Electric capacity CE1 and CE2 concatenation after bridging with dc bus between, the positive pole of electrochemical capacitor CE1 connect dc bus (+), electrochemical capacitor
The negative pole of CE2 connect positive pole connect dc bus (-)；The prime of electrochemical capacitor CE1 and CE2 connects the DC source of grid-connected power generation system,
Rear class connects single-phase full-bridge inverter, then the wave filter consisted of inductance L1 and electric capacity C1 is connected to the live wire L of AC electrical network
With zero line N, or load；The positive pole of electrochemical capacitor CE1 and dc bus (+) junction point voltage " Vin", and electrochemical capacitor CE1 and
The concatenation mid-point voltage V of CE2c2, the sample circuit that is respectively connecting in protection circuit, with reference voltage after sampled processing of circuit
VrefThe protection domain arranged compares the scope of seeing if fall out；In protection circuit, the output of comparator is connected to new forms of energy and sends out
Panel in the DC source of electricity system and semiconductor inverter or drive circuit, to control DC source current supply circuit as required
With the cut-out of semiconductor inverter AC current supply circuit, and the conducting of semiconductor inverter bridge arm transistor.
In Fig. 7, semiconductor inverter is single-phase full-bridge inverter, transistor Q1 and Q4, Q2 and Q3 separately constitute 2 bridges
Between arm bridging and dc bus.The brachium pontis A being made up of transistor Q1 and Q4, the midpoint of brachium pontis A be connected to electric capacity C1 and
AC zero line N；Another brachium pontis B being made up of transistor Q2 and Q3, after the midpoint of brachium pontis B is connected with inductance L1, through inductance
L1 and electric capacity C1 is connected to AC live wire L after connecting.Transistor Q1, Q2, Q3 and Q4 by drive circuit according to panel or guarantor
The signal of protection circuit controls being turned on and off of transistor.
When in Fig. 7 electrochemical capacitor CE1 and CE2 one of them break down inefficacy time, the voltage of electrochemical capacitor junction point Vc1
Signal can exceed reference voltage VrefAfter the protection domain arranged, the comparator in protection circuit in Fig. 7 will be to prime direct current
The DC source of electricity generation system and rear class single-phase full-bridge inverter output " triggering signal ", on the one hand cut off the direct current supply of DC side
Path and AC supply access, control to bridge in rear class single-phase full-bridge inverter one with dc bus the most simultaneously
Or the conducting of 2 transistor brachium pontis, with DC side in electricity generation system of releasing and the dump energy of AC, it is to avoid in electricity generation system
The dump energy of DC side and AC pours into remaining electrochemical capacitor, and the phenomenon that over-voltage breakdown bursts occurs, to realize surplus
Under electrochemical capacitor protect, it is to avoid there is more serious safety failure and human safety issues.
The wherein reference voltage V in Fig. 7refArrange protection domain for from central value be VrefVoltage change range, than
As from 50%VrefTo 150%VrefExcursion.
The wherein reference voltage V in Fig. 7refCan be fixing reference voltage, it is also possible to for Vin/ 2, VinFor dc bus
Voltage.Work as reference voltage Vref=VinWhen/2, reference voltage VrefWill be along with DC bus-bar voltage VinChange and change, this
Sample can make protection circuit be more suitable for large-scale input voltage change application.
Wherein the point of the sampled voltage in Fig. 7 can need not to gather simultaneously dc bus (+) voltage VinWith series connection electrolysis electricity
Hold the V of junction pointC2Even if only including fractional-sample point voltage and can also realizing same defencive function.
Wherein the comparator in Fig. 7 can realize multilevel iudge function by hardware, it is also possible to realizes comparing by software
Arbitration functions.
Embodiment 2
When the DC bus-bar voltage in new forms of energy DC power generation system is increased to use more than 2 electrochemical capacitor concatenations
When reaching the dc bus pressure requirement of insulation, the failure of removal detection to concatenation electrochemical capacitor is particularly important, it is necessary to use
Special protection circuit carries out failure of removal protection.
Fig. 8 is the block diagram of multiple electrochemical capacitor fault secure circuits in a kind of single-phase new forms of energy DC power generation system band, its
Include four parts: the DC source of grid-connected power generation system, multiple electrochemical capacitor CE1, CE2 ..., CEn-1 and CEn, quasiconductor
Inverter and protection circuit.After electrochemical capacitor CE1, CE2 ..., CEn-1 and CEn concatenation between bridging and dc bus, electrolysis electricity
Hold CE1 positive pole connect dc bus (+), the negative pole of electrochemical capacitor CEn connect positive pole connect dc bus (-)；Electrochemical capacitor CE1 arrives
The prime of CEn composition electrochemical capacitor string connects the DC source of grid-connected power generation system, and rear class connects single-phase full-bridge inverter, then by electricity
The wave filter of sense L1 and electric capacity C1 composition is connected to the live wire L and zero line N of AC electrical network, or load；Electrochemical capacitor CE1 is just
Pole and dc bus (+) junction point voltage Vin, electrochemical capacitor CE1 and CE2 concatenate mid-point voltage Vc2 ..., electrochemical capacitor
The concatenation midpoint Vcn of the concatenation midpoint Vcn-1 and electrochemical capacitor CEn-1 and CEn of CEn-2 and CEn-1 is respectively connected to protection circuit
In sample circuit, with reference voltage V after sampled processing of circuitrefThe protection domain arranged compares and sees if fall out
Scope；Panel during the output of comparator is connected to the DC source of grid-connected power generation system and semiconductor inverter in protection circuit
Or drive circuit, to control DC source current supply circuit and the cut-out of semiconductor inverter AC current supply circuit as required, and
The conducting of semiconductor inverter bridge arm transistor.
In Fig. 8, semiconductor inverter is single-phase full-bridge inverter, transistor Q1 and Q4, Q2 and Q3 separately constitute 2 bridges
Between arm bridging and dc bus.The brachium pontis A being made up of transistor Q1 and Q4, the midpoint of brachium pontis A be connected to electric capacity C1 and
AC zero line N；Another brachium pontis B being made up of transistor Q2 and Q3, after the midpoint of brachium pontis B is connected with inductance L1, through inductance
L1 and electric capacity C1 is connected to AC live wire L after connecting.Transistor Q1, Q2, Q3 and Q4 by drive circuit according to panel or guarantor
The signal of protection circuit controls being turned on and off of transistor.
When one of them electrolysis condenser in the electrochemical capacitor string of electrochemical capacitor CE1 to CEn composition in Fig. 8 breaks down
During short-circuit failure, the voltage signal of the junction point that electrochemical capacitor is corresponding can exceed reference voltage VrefAfter the protection domain arranged, figure
The comparator in protection circuit in 8 will export to the DC source of prime DC power generation system and rear class single-phase full-bridge inverter
" triggering signal ", on the one hand cuts off direct current supply path and the AC supply access of DC side, after controlling the most simultaneously
The conducting of the transistor brachium pontis of bridging and dc bus in level single-phase full-bridge inverter, with DC side and friendship in electricity generation system of releasing
The dump energy of stream side, it is to avoid in electricity generation system, the dump energy of DC side and AC pours into remaining electrochemical capacitor, occurs
The phenomenon that over-voltage breakdown bursts, with realize remaining electrochemical capacitor is protected, it is to avoid occur more serious safety failure and
Human safety issues.
The wherein reference voltage V in Fig. 8refArrange protection domain for from central value be VrefVoltage change range, than
As from 50%VrefTo 150%VrefExcursion.
The wherein reference voltage V in Fig. 8refCan be fixing reference voltage, it is also possible to for Vin/ n, VinFor dc bus
Voltage, " n " is number n of bridging and the series connection electrolysis electric capacity of dc bus.Work as reference voltage Vref=VinDuring/n, reference voltage
VrefWill be along with DC bus-bar voltage VinChange and change, so protection circuit can be made to be more suitable on a large scale and input
Change in voltage is applied.
Wherein the point of the sampled voltage in Fig. 8 can need not to gather simultaneously dc bus (+) voltage VinWith series connection electrolysis electricity
Hold all each point voltage V of junction pointC2..., Vcn-1 and Vcn, even if only including fractional-sample point can also realize same guarantor
Protective function.
Wherein the comparator in Fig. 8 can realize multilevel iudge function by hardware, it is also possible to realizes comparing by software
Arbitration functions.
Embodiment 3
Fig. 9 is the block diagram of electrochemical capacitor fault secure circuit in a kind of three-phase new forms of energy DC power generation system band, wherein wraps
Include four parts: the DC source of grid-connected power generation system, electrochemical capacitor CE1 and CE2, semiconductor inverter and protection circuit.Electrolysis
Electric capacity CE1 and CE2 concatenation after bridging with dc bus between, the positive pole of electrochemical capacitor CE1 connect dc bus (+), electrochemical capacitor
The negative pole of CE2 connect positive pole connect dc bus (-)；The prime of electrochemical capacitor CE1 and CE2 connects the DC source of grid-connected power generation system,
Rear class connects three-phase full-bridge inverter, then by inductance La, inductance Lb, inductance Lc, electric capacity Ca, electric capacity Cb and the filter of electric capacity Cc composition
Ripple device is connected to AC UVW three phase network or load；The positive pole of electrochemical capacitor CE1 and dc bus (+) junction point voltage
The sample circuit that the concatenation mid-point voltage Vc2 of Vin and electrochemical capacitor ce1 and ce2 is respectively connected in protection circuit, sampled circuit
With reference voltage V after processrefThe protection domain arranged compares the scope of seeing if fall out；Comparator in protection circuit
Output is connected to the panel in the DC source of grid-connected power generation system and semiconductor inverter or drive circuit, to cut as required
While disconnected DC source current supply circuit and semiconductor inverter AC current supply circuit, and semiconductor inverter bridge arm transistor
Conducting.
In Fig. 9, semiconductor inverter is three-phase full-bridge inverter, by transistor Qa1 and Qa2, Qb1 and Qb2, Qc1 and Qc2
Separately constitute 3 brachium pontis A, B and C, between bridging and dc bus；The brachium pontis A of transistor Qa1 and Qa2 composition, in brachium pontis A
After point is connected with inductance La, it is connected through inductance La and electric capacity Ca, electric capacity Cc and AC U phase；Transistor Qb1 and Qb2 composition
Brachium pontis B, after the midpoint of brachium pontis B is connected with inductance Lb, is connected through inductance Lb and electric capacity Ca, electric capacity Cb and AC V phase；Transistor
The brachium pontis C of Qc1 and Qc2 composition, after the midpoint of brachium pontis C is connected with inductance Lc, through inductance Lb and electric capacity Cb, electric capacity Cc and AC
W phase is connected.
In Fig. 9, transistor Qa1, Qa2, Qb1, Qb2, Qc1 and the Qc2 in three-phase full-bridge inverter by drive circuit according to
The signal of panel or protection circuit controls being turned on and off of transistor.
When in Fig. 9 electrochemical capacitor CE1 and CE2 one of them break down inefficacy time, the voltage of electrochemical capacitor junction point Vc2
Signal can exceed reference voltage VrefAfter the protection domain arranged, the comparator in protection circuit in Fig. 9 will be to prime direct current
The DC source of electricity generation system and rear class three-phase full-bridge inverter output " triggering signal ", on the one hand cut off the direct current supply of DC side
Path and AC supply access, control to bridge in rear class three-phase full-bridge inverter one with dc bus the most simultaneously
Or the conducting of multiple transistor brachium pontis, with DC side in electricity generation system of releasing and the dump energy of AC, it is to avoid electricity generation system
The dump energy of middle DC side and AC pours into remaining electrochemical capacitor, and the phenomenon that over-voltage breakdown bursts occurs, right to realize
Remaining electrochemical capacitor is protected, it is to avoid more serious safety failure and human safety issues occur.
The wherein reference voltage V in Fig. 9refArrange protection domain for from central value be VrefVoltage change range, than
As from 50%VrefTo 150%VrefExcursion.
The wherein reference voltage V in Fig. 9refCan be fixing reference voltage, it is also possible to for Vin/ 2, VinFor dc bus
Voltage.Work as reference voltage Vref=VinWhen/2, reference voltage VrefWill be along with DC bus-bar voltage VinChange and change, this
Sample can make protection circuit be more suitable for large-scale input voltage change application.
Wherein the point of the sampled voltage in Fig. 9 can need not to gather simultaneously dc bus (+) voltage VinWith series connection electrolysis electricity
Hold the voltage V of junction pointC2Even if only including fractional-sample point and can also realizing same defencive function.
Wherein the comparator in Fig. 9 can realize multilevel iudge function by hardware, it is also possible to realizes comparing by software
Arbitration functions.
Embodiment 4
When the DC bus-bar voltage in new forms of energy DC power generation system is increased to use more than 2 electrochemical capacitor concatenations
When reaching the dc bus pressure requirement of insulation, the failure of removal detection to concatenation electrochemical capacitor is particularly important, it is necessary to use
Special protection circuit carries out failure of removal protection.
Figure 10 is the block diagram of multiple electrochemical capacitor fault secure circuits in a kind of three-phase new forms of energy DC power generation system band, its
Include four parts: the DC source of grid-connected power generation system, multiple electrochemical capacitor CE1, CE2 ..., Cn-1 and Cn, quasiconductor are inverse
Become device and protection circuit.After electrochemical capacitor CE1, CE2 ..., Cn-1 and Cn concatenation between bridging and dc bus, electrochemical capacitor
The positive pole of CE1 connect dc bus (+), the negative pole of electrochemical capacitor CEn connect positive pole connect dc bus (-)；Electrochemical capacitor CE1 to CEn
The prime of composition electrochemical capacitor string connects the DC source of grid-connected power generation system, and rear class connects three-phase full-bridge inverter, then passes through inductance
The wave filter of La, inductance Lb, inductance Lc, electric capacity Ca, electric capacity Cb and electric capacity Cc composition is connected to AC UVW three phase network or negative
Carry；Electrochemical capacitor CE1 positive pole and dc bus (+) junction point voltage Vin, electrochemical capacitor CE1 and CE2 concatenate mid-point voltage
Vc2 ..., the concatenation mid-point voltage Vcn-1 of electrochemical capacitor CEn-2 and CEn-1, the concatenation midpoint electricity of electrochemical capacitor CEn-1 and CEn
The sample circuit that pressure Vcn is respectively connected in protection circuit, the protection model arranged with reference voltage V ref after sampled processing of circuit
Enclose and compare the scope of seeing if fall out；In protection circuit the output of comparator be connected to grid-connected power generation system DC source and
Panel in semiconductor inverter or drive circuit, to control DC source current supply circuit and semiconductor inverter friendship as required
The cut-out of stream side current supply circuit, and the conducting of semiconductor inverter bridge arm transistor.
In Figure 10, semiconductor inverter is three-phase full-bridge inverter, by transistor Qa1 and Qa2, Qb1 and Qb2, Qc1 and
Qc2 separately constitutes 3 brachium pontis A, B and C, between bridging and dc bus；The brachium pontis A of transistor Qa1 and Qa2 composition, brachium pontis A's
After midpoint is connected with inductance La, it is connected through inductance La and electric capacity Ca, electric capacity Cc and AC U phase；Transistor Qb1 and Qb2 forms
Brachium pontis B, after the midpoint of brachium pontis B is connected with inductance Lb, be connected through inductance Lb and electric capacity Ca, electric capacity Cb and AC V phase；Crystal
The brachium pontis C of pipe Qc1 and Qc2 composition, after the midpoint of brachium pontis C is connected with inductance Lc, through inductance Lb and electric capacity Cb, electric capacity Cc with exchange
Side W phase is connected.
When the electrochemical capacitor string that electrochemical capacitor CE1 to CEn in Figure 10 forms, one of them breaks down and lost efficacy, electrolysis electricity
The voltage signal holding corresponding junction point can exceed reference voltage VrefAfter the protection domain arranged, in the protection circuit in Figure 10
Comparator will export " triggering signal " to the DC source of prime DC power generation system and rear class three-phase full-bridge inverter, a side
Face cuts off direct current supply path and the AC supply access of DC side, controls rear class three-phase full-bridge inverter the most simultaneously
The conducting of the transistor brachium pontis of middle bridging and dc bus, with DC side in electricity generation system of releasing and the dump energy of AC,
Avoiding the dump energy of DC side and AC in electricity generation system to pour into remaining electrochemical capacitor, what generation over-voltage breakdown burst shows
As, to realize remaining electrochemical capacitor is protected, it is to avoid more serious safety failure and human safety issues occur.
The wherein reference voltage V in Figure 10refArrange protection domain for from central value be VrefVoltage change range, than
As from 50%VrefTo 150%VrefExcursion.
The wherein reference voltage V in Figure 10refCan be fixing reference voltage, it is also possible to for Vin/ n, VinFemale for direct current
Line voltage, " n " is number n of bridging and the series connection electrolysis electric capacity of dc bus.Work as reference voltage Vref=VinDuring/n, benchmark electricity
Pressure VrefWill be along with DC bus-bar voltage VinChange and change, so protection circuit can be made to be more suitable for the most defeated
Enter change in voltage application.
Wherein the point of the sampled voltage in Figure 10 can need not to gather simultaneously dc bus (+) voltage VinWith series connection electrolysis electricity
Hold all each point voltage V of junction pointC2..., Vcn-1 and Vcn, even if only including fractional-sample point can also realize same guarantor
Protective function.
Wherein the comparator in Figure 10 can realize multilevel iudge function by hardware, it is also possible to realizes comparing by software
Arbitration functions.
It is only preferred embodiment of the present utility model in sum, is not used for limiting enforcement model of the present utility model
Enclose.The most all equivalence changes made according to the content of this utility model claim and modification, all should be of the present utility model
Technology category.
Claims (2)
1. a protection circuit for capacitive faults, in electricity generation system, described electricity generation system includes by dc bus even
Connecing DC source, semiconductor inverter, the inverter other end connects AC；It is in series with more than 2 or 2 between dc bus to have
Buffering and the electric capacity of filter function；It is characterized in that: described protection circuit includes sample circuit, comparator and reference voltage mould
Block；Wherein:
Described sample circuit is attached with the point that concatenates of dc bus and series capacitance, and carries out voltage sample；
Described comparator connects sample circuit and reference voltage module respectively.
The protection circuit of capacitive faults the most according to claim 1, it is characterised in that: described semiconductor inverter is single
Phase inverter or three-phase inverter.
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| CN201620662137.8U CN205811511U (en) | 2016-06-29 | 2016-06-29 | A kind of protection circuit of capacitive faults |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620662137.8U CN205811511U (en) | 2016-06-29 | 2016-06-29 | A kind of protection circuit of capacitive faults |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116937692A (en) * | 2023-09-11 | 2023-10-24 | 杭州禾迈电力电子股份有限公司 | Inverter alternating-current side discharge control method and inverter |
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2016
- 2016-06-29 CN CN201620662137.8U patent/CN205811511U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116937692A (en) * | 2023-09-11 | 2023-10-24 | 杭州禾迈电力电子股份有限公司 | Inverter alternating-current side discharge control method and inverter |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20180629 |