CN104882949A - Method for selecting energy-storage capacitance, filter inductance and filter capacitance of energy-storage degaussing power supply - Google Patents
Method for selecting energy-storage capacitance, filter inductance and filter capacitance of energy-storage degaussing power supply Download PDFInfo
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- CN104882949A CN104882949A CN201510244584.1A CN201510244584A CN104882949A CN 104882949 A CN104882949 A CN 104882949A CN 201510244584 A CN201510244584 A CN 201510244584A CN 104882949 A CN104882949 A CN 104882949A
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Abstract
The invention discloses a method for selecting energy-storage capacitance, filter inductance and filter capacitance of an energy-storage degaussing power supply. The method comprises the following steps: (1) calculating pulse theoretical energy; (2) determining nominal voltage of an energy-storage capacitor group and the number of parallel capacitors; (3) calculating energy-storage capacitance matching power supply power of a power station and satisfying the pulse requirement; (4) grouping the energy-storage capacitor group and later convertors, and making a pulse discharge scheme according to a grouping result; and (5) performing calculation step by step according to the discharge scheme to obtain suitable filter inductance and filter capacitance. A multi-redundant mechanism is adopted in the method, safe redundancy in a general output circuit and the convertors is ensured.
Description
Technical field
The invention belongs to ship degassing field, particularly a kind of storage capacitor of energy storage demagnetization power supply and filter inductance, electric capacity method for selecting.
Background technology
The earth is a huge magnet, and iron and steel is the material be easily magnetized, and the naval vessel that iron and steel is built or submarine are in the magnetic field of the earth for a long time, it will be magnetized.As long as ship navigating is on ocean, the naval vessels be magnetized just must produce magnetic field, if do not eliminate this magnetic field, the naval vessels be magnetized are easy to be subject to the weapon attacking such as magnetic mine, torpedo, or become the target of magnetic detecting equipment.Naval vessels itself have two magnetic fields, and one is induced field, and this magnetic field is by selfdemagnetization system offsets on naval vessels; Another is fixed magnetic field, and this magnetic field then will be leaned on degaussing stations or degaussing ship regularly to carry out energising to it and eliminate.
Naval vessel is installed the most effective means that eraser system is ship magnetic protection.Object is the vitality that prevention enemy's magnetic weapon attacking and magnetic detecting improve naval vessel, and ship deperming system is primarily of degaussing winding, Degaussing Control Equipment and demagnetization power unit composition in warship.Demagnetization power supply is the power amplifier device of Deperming Facility, and the control signal that it exports by controller provides direct current controllable current to ship deperming winding, is the important component part of Deperming Facility.Demagnetization power supply is generally all used on the naval vessel of army, submarine, must have high reliability, particularly in wartime.In the demagnetization power supply relying on super capacitor energy storage and power station power supply, have two energy sources to provide energy to pulsed discharge, one is power station, and one is super capacitor.Pulse discharging energy summation is constant, increases super capacitor capacity, just can reduce the power in power station; Otherwise increase the capacity that station capacity just can reduce super capacitor.Reasonably must design the group number of the power in power station and super capacitor, make power station and super capacitor capacity obtain splendid coupling, the impact to electrical network during reduction demagnetization power initiation, must ensure reliability, redundancy that demagnetization power supply is high simultaneously.
For the performance requirement offseting magnetoelectricity source above, propose a kind of can ensure demagnetization power supply possess the storage capacitor capacity of high redundant reliability and filter inductance, electric capacity method for selecting very necessary.
Summary of the invention
Technical problem: the invention provides a kind of can according to different demagnetization power pulse parameter requests, obtain the storage capacitor capacity matched with prime power station power, and meet rear class converter filter inductance, the electric capacity method for selecting of requirement of each pulsed discharge.The method devises the electric capacity module discharge scheme adopting multiple redundancy mechanism, not only makes total filtering inductance reduce, the more important thing is the reliability drastically increasing demagnetization power supply, more meet military project demand.
Technical scheme: the inventive method for energy storage demagnetization power supply be made up of rectifier, charge controller, energy storage super capacitor, rear class constant-current converter, electric current reversing arrangement, system monitor; Rectifier, charge controller, energy storage super capacitor, rear class constant-current converter, electric current reversing arrangement sequential concatenation, system monitor is communicated with charge controller, energy storage super capacitor, rear class constant-current converter, electric current reversing arrangement by order wire; Demagnetization power-supply system accepts the alternating current energy of AC power station, after the links such as over commutation, energy storage, conversion, commutation, for load provides the positive and negative intermittent pulse current replacing, progressively decay.
The storage capacitor of energy storage demagnetization power supply of the present invention and filter inductance, electric capacity method for selecting, comprise the steps:
(1) the cumlative energy E of energy storage demagnetization power supply the 1st pulse to i-th pulse is calculated
i, concrete mode is:
According to formula I
i=I
1× (1-k
Δ I)
i-1the theoretical discharge electric current I of lower i-th pulse of gauge index damped manner
i, or according to formula I
i=I
1-(i-1) × Δ I calculates the theoretical discharge electric current I of lower i-th pulse of equal difference damped manner
i;
According to formula U
i=I
i× R
lcalculate the theoretical discharge voltage U of i-th pulse
i, according to formula P
i=U
i× I
icalculate the theoretical discharge power P of i-th pulse
i, according to formula Q
i=P
i× T
oncalculate the theoretical energy Q of i-th pulse
i, according to formula
calculate the cumlative energy E from the 1st pulse to i-th pulse
i;
Wherein, i is pulse sequence number, span 1 ~ N
pulse, N
pulsefor pulse sum, I
1headed by pulse theory discharging current, k
Δ Ifor pulse current exponential damping coefficient, Δ I is electric current equal difference decay tolerance, R
lfor load resistance, T
onfor individual pulse discharge time, i.e. pulse duration, j is all pulse sequence number, span 1 ~ i;
(2) determine rated voltage and the monomer series-connected number of electric capacity of storage capacitor module, concrete mode is:
According to formula U
ic-b-min=(U
i/ d
buck-max+ Δ u) × k
rcalculate the storage capacitor module electric discharge minimum voltage U of i-th pulse permission during rear class converter employing step-down mode
ic-b-min, or according to formula U
ic-b-b-min=[(1-d
b-b-max) × U
i÷ d
b-b-max+ Δ u] × k
rcalculate the storage capacitor module electric discharge minimum voltage U of i-th pulse permission during rear class converter employing buck mode
ic-b-b-min;
Determine the rated voltage U of single storage capacitor module in such a way
c-N: according to formula U
c-N-b=U
1c-b-min× K
safe-u-bcalculate the rated voltage U of single storage capacitor module during rear class converter employing step-down mode
c-N-b, or according to formula U
c-N-b-b=U
1c-b-b-min× K
safe-u-b-bcalculate the rated voltage U of single storage capacitor module during rear class converter employing buck mode
c-N-b-b, or directly get rated voltage U
c-N-b-b=U
c-N-b;
According to formula N '
series=U
c-N/ U
c-single× K
c-nonuniformitycalculate the monomer series-connected number N ' of electric capacity of single storage capacitor module
seriesif, N '
seriesnot integer, then to positive infinity direction, correction is rounded to it, obtain the monomer series-connected number N of revised storage capacitor
series;
Wherein, d
buck-maxfor the maximum duty cycle of switching tube under step-down mode, d
b-b-maxfor the maximum duty cycle of switching tube under buck mode, Δ u is that converter input and output voltage difference compensates, k
rfor storage capacitor internal resistance and electric transmission copper row pressure-drop coefficient, U
1c-b-minfor the storage capacitor module electric discharge minimum voltage that first pulse during rear class converter employing step-down mode allows, K
safe-u-bfor storage capacitor module rated voltage coefficient of safety during rear class converter employing step-down mode, U
1c-b-b-minfor the storage capacitor module electric discharge minimum voltage that first pulse during rear class converter employing buck mode allows, K
safe-u-b-bfor storage capacitor module rated voltage coefficient of safety during rear class converter employing buck mode, U
c-Nfor the rated voltage of single storage capacitor module, i.e. U
c-Nfor U
c-N-bor U
c-N-b-b, K
c-nonuniformityfor the monomer series-connected voltage nonuniformity coefficient of storage capacitor, U
c-singlefor storage capacitor monomer withstand voltage;
(3) the storage capacitor capability value c ' of primary Calculation and power station power supply power match
sum, concrete mode is:
According to formula W
1c-offer=Q
1-W
g-on-maxcalculate the energy W that storage capacitor module needs to supply to first pulse
1c-offer, then according to formula
primary Calculation goes out and power station power supply power P
gridthe storage capacitor capability value c ' matched
sum;
Wherein, U
1c-minheaded by pulse allow storage capacitor module electric discharge minimum voltage, η
c-loadfor storage capacitor module is to the efficiency of load discharge, Q
1headed by pulse theory energy, W
g-on-maxfor in power station is during pulsed discharge to the ceiling capacity of pulse supply, by formula W
g-on-max=P
grid× T
on× η
g-loaddetermine, η
g-loadfor power station through prime charge controller and rear class constant-current converter to the efficiency of load energy supply;
(4) to the storage capacitor capability value c ' that described step (3) is tentatively calculated
sumcarry out verification correction, and determine storage capacitor module sum N
c-sum;
(5) to storage capacitor module sum N
c-sumcarry out revising and dividing into groups, concrete mode is:
According to the way N of demagnetization power acquisition with rear class converter
converterby N
c-sumgroup storage capacitor module is divided into N altogether
convertergroup, often group comprises N
parallel=N
c-sum/ N
convertergroup storage capacitor module, N
parallelshould be greater than 1 positive integer, and the storage capacitor module number of each road rear class converters wants consistent, if N
paralleldo not meet above-mentioned two requirements, then to storage capacitor monomer capacity c
singleafter revising according to the following formula, return step (4): c
single=c
single× k
c-single, wherein k
c-singlefor storage capacitor monomer cubage correction coefficient;
If N
parallelmeet above-mentioned two requirements, then by N
parallelgroup storage capacitor module electrically and to be unified into capacitance be c
single-module=N
parallel× c
single/ N
series, rated voltage is U
c-Nsingle storage capacitor working group, then all single storage capacitor working group obtained is divided into groups;
(6) carry out process of pulse discharge design, concrete mode is:
When the theoretical discharge electric current I of i-th pulse
ibe greater than I
1when/2, N
converterindividual normal working group all participates in electric discharge;
When the theoretical discharge electric current I of i-th pulse
ibe greater than I
1/ 4 and be less than I
1when/2, by comprising N
converterlarge group of/2 storage capacitor working groups is discharged;
When the theoretical discharge electric current I of i-th pulse
ibe greater than I
1/ 8 and be less than I
1when/4, by comprising N
converterthe group of/4 storage capacitor working groups discharges;
When the theoretical discharge electric current I of i-th pulse
ibe less than I
1when/8, discharged by single storage capacitor working group, now, if the ceiling capacity can discharging to all storage capacitor working groups of i-th pulse power supply is greater than the pulse energy sum from i-th to last pulse, then power station just no longer provides any energy to storage capacitor and load, wherein i<N
pulse;
(7) carry out process of pulse discharge calculating, concrete mode is:
According to formula
the energy Q that after calculating i-th pulsed discharge, single storage capacitor working group stores
i-after, according to formula
the voltage U of single storage capacitor working group after calculating i-th pulsed discharge
i-after, according to formula Q
i-before=Q
i-1-after+ W
g-off-onethe energy Q that before calculating i-th pulsed discharge, single storage capacitor working group stores
i-beforeif, Q
i-beforebe greater than the maximum storage energy Q of single storage capacitor working group
one-max, then according to Q
i-before=Q
c-one-maxrevise Q
i-before;
According to formula
the voltage U of single storage capacitor working group before calculating i-th pulsed discharge
i-before, for the voltage U before first pulsed discharge
1-beforeby formula U
1-before=U
c-Ncalculate, the energy that the single storage capacitor working group before first pulsed discharge stores presses formula Q
1-before=Q
c-one-maxvalue, according to formula I
i-single=I
i/ M
ithe electric current that during calculating i-th pulsed discharge, single channel rear class converter flows through;
Wherein, Q
i-beforethe energy that before being i-th pulsed discharge, single storage capacitor working group stores, M
ithe storage capacitor working group group number of energy supply is participated in, M when being i-th pulsed discharge
ivalue is N
converter, N
converter/ 2, N
converter/ 4 or 1, W
g-off-onefor the energy that power station provides within the discharge interval time single storage capacitor working group, when normal group is discharged and Q
i-c-M× η
c-load>=K
q× Q
i-sum-back-lasttime W
g-off-oneget 0, by formula W in other situation
g-off-one=P
grid× T
off÷ N
converter× M
i× η
g-ccalculate, Q
i-c-Mm when being i-th pulse
ithe ceiling capacity that individual storage capacitor working group can discharge, by formula
calculate, Q
i-sum-back-lastfor from i-th pulse to all pulse energy sums of last pulse, i>=N
pulse, K
qfor storage capacitor independently discharges coefficient of safety, W
g-on-offerfor power station supplies the energy of pulse in pulse discharge time, same, discharge and Q in normal group
i-c-M× η
c-load>=K
q× Q
i-sum-back-lasttime W
g-on-offerget 0, in other situations, get W
g-on-offer=P
grid× T
on÷ N
converter× M
i× η
g-load, Q
c-one-maxby formula Q
c-one-max=12 × c
single-module× U
2 c-Ncalculate,
for the storage capacitor module electric discharge minimum voltage that last pulse allows;
(8) filter inductance and filtering capacitance is asked for according to process of pulse discharge result of calculation.
Further, the particular content of step (4) is:
A) from first pulse, the ceiling capacity sum W that can provide in during the ceiling capacity that power station can be provided in discharge interval and pulsed discharge
g-offer-max=W
g-off-max+ W
g-on-maxwith the theoretical energy Q of each pulse
irelatively, until W
g-offer-maxbe more than or equal to the theoretical energy Q of i-th pulse
itill, then obtain c '
sumeach circulation of verification needs the pulse number N carrying out verifying
check=i-1;
B) be c ' by a capacity
sum, rated voltage is U
c-Nstorage capacitor as the energy storage module of demagnetization power supply, and progressively discharge calculation is carried out to this module;
C) after discharging to this energy storage module, the whether satisfied storage capacitor module electric discharge minimum voltage being more than or equal to the pulse permission calculated in step (2) of voltage verifies, if do not met, then according to c ' at every turn
sum=c '
sum× (1+K
c-sum-correction) revise c '
sumafter, return step b), until N before in epicycle verification
checkstorage capacitor module that individual pulse allows electric discharge minimum voltage is all less than or equal to after the electric discharge of energy storage module till voltage, and enters steps d);
D) according to formula N '
c-sum=(N
seires× c '
sum)/c
singlecalculate storage capacitor module sum initial value N '
c-sum, by N '
c-sumbe multiplied by K
safe-c-Nand round, just obtain and power station power P
gridthe storage capacitor module sum N of the certain Safety Redundancy of consideration of coupling
c-sum, then obtain the storage capacitor capacity C considering certain Safety Redundancy
sum=N
c-sum× c
single÷ N
series;
Wherein, W
g-off-maxfor power station supplies the ceiling capacity of storage capacitor module, by formula W in discharge interval
g-off-max=P
grid× T
off× η
g-cdetermine, T
offfor the discharge interval time, η
g-cfor the efficiency charged to storage capacitor module through prime charge controller in power station, K
c-sum-correctionfor the storage capacitor cubage correction coefficient needed, c
singlefor tentatively selected storage capacitor monomer capacity, K
safe-c-Nfor storage capacitor module number Safety Redundancy coefficient, its value is greater than 1.
Further, as follows all single storage capacitor working group obtained is divided into groups in step (5): by N
converterindividual storage capacitor working group is all considered as normal working group, N
converterindividual normal working group is divided into two large group, and each large group has N
converter/ 2 storage capacitor working groups, then be divided into Liang Ge group by one large group, there is N in each group
converter/ 4 storage capacitor working groups, more each group is divided into N
converter/ 4 smallest group, smallest group is single storage capacitor working group.
Further, in step (8), rear class converter does not adopt crisscross parallel circuit, asks for filter inductance and filtering capacitance in the following manner:
According to formula
calculate rear class converter and adopt the minimum filter inductance L meeting continuous current mode during step-down lower i-th pulsed discharge of mode
i-Lvbo-buck, or according to formula
calculate rear class converter and adopt the minimum filter inductance L meeting continuous current mode during buck lower i-th pulsed discharge of mode
i-Lvbo-b-b;
To array [L
1-Lvbol
2-Lvboggg L
npulse-Lvbo] get maximum and obtain inductance value L corresponding to normal working group
normal, by minimum inductance L during step-down mode
min=L
normalsubstitute into formula
meeting the fluctuation of each pulse voltage when trying to achieve rear class converter employing step-down mode is Δ U
ithe minimum filtering capacitance C required
i-Lvbo-b, or according to
try to achieve minimum filtering capacitance C during rear class converter employing buck mode
i-Lv-b-b, to array [C
1-Lvboc
2-Lvboggg C
npulse-Lvbo] get maximum and obtain filtering capacitance C corresponding to normal working group
normal;
Wherein, U
i-in-maxthe maximum input voltage of rear class converter when being i-th pulsed discharge, U
i-in-maxby formula U
i-in-max=U
i-before/ k
rtry to achieve, U
i-in-minthe minimum input voltage of rear class converter when being i-th pulsed discharge, U
i-in-minby formula U
i-in-min=U
i-after/ k
rtry to achieve, T
sthe switch periods of rear class converter, K
lfor inductance Safety Redundancy coefficient, Δ U
i-ripplebe the magnitude of a voltage fluctuation that i-th pulse theory discharge voltage allows, by formula Δ U
i-ripple=K
Δ U× U
icalculate, array [L
1-Lvbol
2-Lvboggg L
npulse-Lvbo] meet the minimum filter inductance array of all working group continuous current mode, i.e. [L
1-Lvbo-buckl
2-Lvbo-buckgggL
npulse-Lvbo-buck] or [L
1-Lvbo-b-bl
2-Lvbo-b-bgggL
npulse-Lvbo-b-b], array [C
1-Lvboc
2-Lvboggg C
npulse-Lvbo] meet the minimum filter capacitor array of all working group voltage fluctuation requirement, i.e. [C
1-Lvbo-bc
2-Lvbo-bggg C
npulse-Lvbo-b] or [C
1-Lvbo-b-bc
2-Lvbo-b-bggg C
npulse-Lvbo-b-b].
Further, in step (8), rear class converter adopts N
inter-parallelthe buck circuit of road crisscross parallel or N
inter-parallelduring the buck-boost circuit of road crisscross parallel, ask for filter inductance and filtering capacitance in the following manner:
First in the following manner filter inductance value and filter capacitor is tentatively asked for:
According to formula
calculate rear class converter and adopt the minimum filter inductance L meeting continuous current mode during step-down lower i-th pulsed discharge of mode
i-Lvbo-buck, or according to formula
calculate rear class converter and adopt the minimum filter inductance L meeting continuous current mode during buck lower i-th pulsed discharge of mode
i-Lvbo-b-b;
To array [L
1-Lvbol
2-LvbogggL
x-1-Lvbo] get maximum and obtain inductance value L corresponding to normal working group
normal, to array [L
x-Lvbol
x+1-Lvboggg L
npulse-Lvbo] get maximum and obtain inductance value L corresponding to small area analysis specific group
special, by minimum inductance L during step-down mode
min=L
normalor L
min=L
specialsubstitute into formula respectively
meeting the fluctuation of each pulse voltage when trying to achieve rear class converter employing step-down mode is Δ U
ithe minimum filtering capacitance C required
i-Lvbo-b, or according to
try to achieve minimum filtering capacitance C during rear class converter employing buck mode
i-Lv-b-b;
To array [C
1-Lvboc
2-Lvboggg C
x-1-Lvbo] get maximum and obtain filtering capacitance C corresponding to normal working group
normal, to array [C
x-Lvboc
x+1-Lvboggg C
npulse-Lvbo] get maximum and obtain filtering capacitance C corresponding to small area analysis specific group
special;
Then filter inductance value and filter capacitor is revised in the following manner:
According to following formula, the filter inductance value of trying to achieve in aforesaid way is revised:
L '
normal=L
normal/ N
2 inter-parallel× K
parallel-Lor L '
special=L
special/ N
2 inter-parallel× K
parallel-L;
During for rear class converter employing buck, by the filter capacitor of mode correction below: by revised filter inductance value L
min=L '
normalbring formula into
again the filtering capacitance C that normal working group is corresponding is asked for
normalthe filtering capacitance C corresponding with small area analysis specific group
special;
Step-down/up type is adopted for rear class converter, by the filter capacitor of mode correction below:
C′
normal＝C
normal/N
2 inter-parallel×K
parallel-C
C′
special＝C
special/N
2 inter-parallel×K
parallel-C；
Wherein, K
parallel-Lfor the coefficient of safety of inductance during converter employing crisscross parallel mode, K
parallel-Cfor the redundancy coefficient of electric capacity during step-down/up type rear class converter employing crisscross parallel mode.
Beneficial effect: the present invention compared with prior art, has the following advantages:
The present invention is carrying out considering certain Safety Redundancy when super capacitor group number is determined, when carrying out the design of super capacitor module discharge scheme, each discharge regime comprises redundancy scheme, the mutual standby redundancy between regular picture group, rear class converter inside equally also adds redundancy scheme, i.e. N
inner-parallel+ 1 road parallel redundancy mechanism, the reliability of demagnetization power supply improved further, being equivalent to each converter circuit has redundancy, and total output circuit has redundancy again, and reliability is very high.The maximum pulsation rate ratio of mean value (the pulsation amplitude with) that heterogeneous multiple chopper circuit exports total current is in theory inversely proportional to the number of phases square, and ripple frequency improves, therefore, when maximum pulsation rate one timing of control output current, the smoothing reactor inductance value required for heterogeneous multiple chopper circuit greatly reduces than individual unit chopper circuit.The average current that every road reduction voltage circuit or step-up/step-down circuit are born is less, and switching device is easily selected, the corresponding raising of switching frequency, can reduce the requirement of filtering inductance further.
Accompanying drawing explanation
Fig. 1 is demagnetization power-supply system logic diagram of the present invention;
Fig. 2 is demagnetization power system approach of the present invention;
Fig. 3 is program flow diagram of the present invention;
Discharge principle figure when Fig. 4 is the storage capacitor capability value of calculating of the present invention and power station power supply power match;
Fig. 5 is that the present invention carries out electric capacity module grouping schematic diagram;
Fig. 6 is demagnetization power supply typical output current waveform of the present invention;
Fig. 7 is demand power station power supply power of the present invention and capacitance group number graph of a relation;
The discharge scheme electric capacity module grouping schematic diagram that Fig. 8 designs for the present invention;
" 3+3 " electric capacity module grouping schematic diagram in the discharge scheme that Fig. 9 designs for the present invention in single large group;
The six phase sixfold step-up/step-down circuit crisscross parallel circuit diagrams that Figure 10 designs for the present invention;
The demagnetization power supply exemplary pulse current output waveform figure that Figure 11 designs for the specific embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
The inventive method for high reliability energy storage demagnetization power supply be made up of rectifier 1, charge controller 2, energy storage super capacitor 3, rear class constant-current converter 4, electric current reversing arrangement 5, system monitor 6; Rectifier 1, charge controller 2, energy storage super capacitor 3, rear class constant-current converter 4, electric current reversing arrangement 5 sequential concatenation, system monitor 6 is communicated with charge controller 2, energy storage super capacitor 3, rear class constant-current converter 4, electric current reversing arrangement 5 by order wire, and structure chart as shown in Figure 1.Demagnetization power-supply system accepts the alternating current energy of AC power station, after the links such as over commutation, energy storage, conversion, commutation, for load provides the positive and negative intermittent pulse current replacing, progressively decay.
Figure 5 shows that demagnetization power supply typical output current waveform.The demagnetization power supply following to performance index is carried out storage capacitor and filter inductance, the selected design of electric capacity below, with this, technical method of the present invention is described.
Performance index: a. output current: 50-4000A continuously adjustabe;
B. output voltage: 0-650VDC continuously adjustabe;
C. load resistance :≤0.1625 Ω;
D. output current wave: pulsed is positive and negative alternately, by equal difference or the decay of exponential law successive, overshoot :≤2% (by individual pulse);
E. pulse duration: 5-10s;
F. the pulse spacing: 15-20s;
G. pulse number: 50;
(1) the cumlative energy E of energy storage demagnetization power supply the 1st pulse to the 50th pulse is calculated
i;
The parameter used: first pulse theory discharging current I
1=4000A, electric current equal difference decay tolerance Δ I=80A, load resistance R
l=0.1625 Ω, individual pulse T discharge time
on=10s, pulse current exponential damping coefficient k
Δ I=0.1, pulse sum N
pulse=50.Calculate shown in table 1 and carry out by equal difference the theoretical pulse data that shown in the pulse energy data that calculate and table 2, table 2 calculates by attenuation coefficient 0.1.
Table 1 carries out the pulse energy data calculated by equal difference
The theoretical pulse data that table 2 calculates by attenuation coefficient 0.1
(2) determine rated voltage and the monomer series-connected number of electric capacity of storage capacitor module, concrete mode is:
Bring first pulse theory discharge voltage into formula U
1c-b-min=(U
1/ d
buck-max+ Δ u) × k
rcalculate the capacitor discharge minimum voltage U of first pulse permission during rear class converter employing step-down mode
1c-b-min=703.6V, makes the rated voltage U of single storage capacitor module
c-N=U
1c-b-min× K
safe-u-b=864V, according to formula N
seires=U
c-N/ U
c-single× K
c-nonuniformitycalculate the monomer series-connected number N ' of electric capacity of single storage capacitor module
series=318.42, the monomer series-connected number N of revised storage capacitor
series=320, wherein, d
buck-max=0.97, Δ u=0, k
r=1.05, K
c-nonuniformity=1.22, U
c-single=2.7V, K
safe-u-b=1.228.
(3) the storage capacitor capability value c ' of primary Calculation and power station power supply power match
sum.
Select current index decay, rear class converter buck mode below, power station power supply power P
gridelecting 1000kW as is the design that example carries out next step filter inductance, electric capacity.
According to formula W
1c-offer=Q
1-W
g-on-maxcalculate the energy W that storage capacitor module needs to supply to first pulse
1c-offer=17900kJ; Again according to formula
primary Calculation goes out and power station power supply power P
gridthe storage capacitor capability value c ' matched
sum=60.18F;
Wherein, the storage capacitor module electric discharge minimum voltage U of first pulse permission
1c-min=292.5V, storage capacitor module is to the efficiency eta of load discharge
c-load=0.9, power station through prime charge controller and rear class constant-current converter to the efficiency eta of load energy supply
g-load=0.81;
4) to the storage capacitor capability value c ' that described step (3) is tentatively calculated
sumcarry out verification correction, and determine storage capacitor module sum N
c-sum:
According to formula W
g-offer-max=W
g-off-max+ W
g-on-maxcalculate power station in discharge interval and during pulsed discharge in the ceiling capacity sum W that can provide
g-offer-max=20150kJ, this energy has been greater than the theoretical energy Q of the 3rd pulse under exponential damping
3, only need to verify the first two pulse, i.e. N
check=2;
As shown in Figure 4, be c ' by a capacity
sum, rated voltage is U
c-Nstorage capacitor as the energy storage module of demagnetization power supply, and progressively discharge calculation is carried out to this module, and to capacity c '
sumcarry out verifying and by storage capacitor cubage correction COEFFICIENT K
c-sum-correction=0.1 revises, and obtains revised c '
sum=72.82F;
According to formula N '
c-sum=(N
seires× c '
sum)/c
singlecalculate storage capacitor module sum initial value N '
c-sum=8, by N '
c-sumbe multiplied by storage capacitor module number Safety Redundancy COEFFICIENT K
safe-c-N=1.4 and round, just obtain and power station power P
gridthe storage capacitor module sum N of the certain Safety Redundancy of consideration of coupling
c-sum=12, then obtain the storage capacitor capacity C considering certain Safety Redundancy
sum=N
c-sum× c
single÷ N
series=112.5F.
Calculate the demand output power in electric current equal difference decay rear class converter step-down mode, electric current equal difference decay rear class converter buck mode, current index decay rear class converter step-down mode, current index decay rear class converter buck mode four kinds of situations and capacitance group number relation (not considering Safety Redundancy) respectively, as shown in table 3, table 4 and Fig. 7.Wherein electric capacity monomer capacity is c
single=3000F, and by first pulse power P
1with power station power supply power P
gridratio be defined as power stage and compare K
p, i.e. K
p=P
1/ P
grid.
The demand output power that table 3 step-down mode calculates and capacitance group number
The demand output power that table 4 buck mode calculates and capacitance group number
(5) to storage capacitor module sum N
c-sum=12 carry out revising and dividing into groups:
According to the way N of demagnetization power acquisition with rear class converter
converter=12 by N
c-sumgroup storage capacitor module is divided into altogether 12 groups, and does not need to revise.Fig. 8 and Figure 9 shows that storage capacitor mould splits prescription case schematic diagram.Each storage capacitor working group forms an independently module, each independently block configuration independently charger, independently rear class converter, and the backward load in parallel of rear class converter provides discharge pulse current.12 storage capacitor working groups are divided into two large group, and often group has 6 storage capacitor working groups; Each large group is divided into again 2 groups, and there are 3 storage capacitor working groups in each group.
(6) carry out process of pulse discharge design, concrete mode is:
When pulse current is greater than 2000A, 12 storage capacitor working groups all participate in electric discharge; 12 storage capacitor working groups are divided into two large group, and often group has 6 storage capacitor working groups, and pulse current is less than 2000A, when being greater than 1000A, only have one of them large group to participate in electric discharge in two large group; Each large group is divided into again 2 groups, and there are 3 storage capacitor working groups in each group, and pulse current is less than 1000A, when being greater than 500A, only has a group to participate in electric discharge in Liang Ge group; When discharging current is less than 500A, 1 group of electric capacity is only had to participate in electric discharge.
According to electric capacity mould splits prescription case above, can obtain according to the current data in the theoretical pulse data form calculated by attenuation coefficient 0.1 above: the 1. stage one: from the 1st pulse to the 7th pulse, amount to 7 pulses, participate in energy supply by 12 groups of storage capacitor working groups; 2. in the stage two: from the 8th pulse to the 14th pulse, amount to 7 pulses, participate in energy supply by 6 groups of storage capacitor working groups; 3. in the stage three: from the 15th pulse to the 20th pulse, amount to 6 pulses, participate in energy supply by 3 groups of storage capacitor working groups; 4. in the stage four: from the 21st pulse to the 50th pulse, 30 pulses are amounted to, by the complete independence energy supply of single storage capacitor working group.And in front 3 stages, if the energy that the current electric capacity module participating in electric discharge can discharge is greater than current PRF to the 18th pulse energy accumulation sum, then discharged by complete electric capacity module, sum power station does not reoffer any energy, until complete all pulsed discharges.
(7) process of pulse discharge calculating is carried out;
Be respectively the single electric capacity module pulse calculated by process of pulse discharge shown in table 5, table 6 and put the rear voltage of front electricity, the electric current that when table 7 is each pulsed discharge calculated by process of pulse discharge, single channel rear class converter flows through.
Voltage before the pulsed discharge of table 5 single electric capacity module
Voltage after the pulsed discharge of table 6 single electric capacity module
The electric current that during table 7 each pulsed discharge, single channel rear class converter flows through
(8) filter inductance and filtering capacitance is asked for according to the process of pulse discharge result of calculation of described step (7):
Go out the front and back voltage of each pulsed discharge according to above-mentioned discharge process designing and calculating, and bring formula into
in, calculate the minimum inductance L of i-th pulsed discharge requirement during rear class converter employing buck mode
i-Lvbo-b-b, computed information is as shown in table 8, and wherein the operating frequency of switching tube is set to f=6kHz, switch periods T
s=1/f.
The inductance value calculated under the power 1000kW current index attenuation transform device buck mode of table 8 power station
To 50 the inductance value maximizings calculated, the inductance value L=114.45 (μ H) of the correspondence of normal working group group can be obtained, wherein get K
l=2.In this scheme, the rear class converter often organizing module is made up of 6 Buck-boost circuit crisscross parallels, form the heavy chopper circuit of 6 phases 6,5 tunnels normally work, 1 tunnel is for subsequent use as redundancy, each switching tube electric current 100A, the switching tube operating frequency of this level currents can be higher, and the heavy chopper circuit of 6 phases 6 reduces the requirement to filter inductance further.Therefore tackle above-mentioned inductance value of trying to achieve and revise: L '=L/25 × 2=9.16 (μ H).According to formula
ask for electric capacity of voltage regulation during rear class converter employing buck mode, the capacitance of trying to achieve is as shown in table 9.
Electric capacity of voltage regulation value during table 9 power station power 1000kW current index decay rear class converter employing buck mode
When can obtain power station power 1000kW, current index decay, rear class converter employing buck mode, filtering capacitance C '=3150172 ÷ 25 × 1.2=151208 (μ F) that normal working group is corresponding, wherein step-down/up type rear class converter adopt crisscross parallel mode time electric capacity redundancy COEFFICIENT K
parallel-C=1.2.
Figure 11 shows that demagnetization power supply stage four the first two pulse current Output simulation oscillogram that the specific embodiment of the invention designs, paired pulses electric current commutates, can find out that the rising edge of pulse and trailing edge all meet the requirement being less than 1s.
The advantage of scheme is that redundancy properties is good, carrying out considering at least 40% Safety Redundancy when super capacitor group number is determined, when carrying out the design of super capacitor module discharge scheme, each discharge regime comprises redundancy scheme, mutual standby redundancy between regular picture group, rear class converter inside equally also adds redundancy scheme, i.e. 5+1 road parallel redundancy mechanism, further the reliability of demagnetization power supply is improved, be equivalent to each converter circuit and have redundancy, total output circuit has redundancy again, and reliability is very high.The design current of each module is 500A, real work maximum current is 333A, the switching tube range of choice of module is very large, operating frequency can be higher, the numerical value of filter inductance can be reduced like this, super capacitor only deposits series voltage equalization problem in addition, there is not parallel-current equalization problem, can reduce the hardware cost of the balanced aspect of super capacitor.
Claims (5)
1. the storage capacitor of energy storage demagnetization power supply and filter inductance, an electric capacity method for selecting, it is characterized in that, the method comprises the steps:
(1) energy storage demagnetization power supply the 1st pulse is calculated to the
the cumlative energy of individual pulse
, concrete mode is:
According to formula
under gauge index damped manner
the theoretical discharge electric current of individual pulse
, or according to formula
to calculate under equal difference damped manner the
the theoretical discharge electric current of individual pulse
;
According to formula
calculate the
the theoretical discharge voltage of individual pulse
, according to formula
calculate the
the theoretical discharge power of individual pulse
, according to formula
calculate the
the theoretical energy of individual pulse
, according to formula
calculate from the 1st pulse to the
the cumlative energy of individual pulse
;
Wherein,
for pulse sequence number, span 1 ~
,
for pulse sum,
headed by pulse theory discharging current,
for pulse current exponential damping coefficient,
for electric current equal difference decay tolerance,
for load resistance,
for individual pulse discharge time, i.e. pulse duration,
be all pulse sequence number, span 1 ~
;
(2) determine rated voltage and the monomer series-connected number of electric capacity of storage capacitor module, concrete mode is:
According to formula
to calculate when rear class converter adopts step-down mode the
the storage capacitor module electric discharge minimum voltage that individual pulse allows
, or according to formula
to calculate when rear class converter adopts buck mode the
the storage capacitor module electric discharge minimum voltage that individual pulse allows
;
Determine the rated voltage of single storage capacitor module in such a way
: according to formula
calculate the rated voltage of single storage capacitor module during rear class converter employing step-down mode
, or according to formula
calculate the rated voltage of single storage capacitor module during rear class converter employing buck mode
, or directly get rated voltage
=
;
According to formula
calculate the monomer series-connected number of electric capacity of single storage capacitor module
if,
not integer, then to positive infinity direction, correction is rounded to it, obtain the monomer series-connected number of revised storage capacitor
;
Wherein,
for the maximum duty cycle of switching tube under step-down mode,
for the maximum duty cycle of switching tube under buck mode,
for converter input and output voltage difference compensates,
for storage capacitor internal resistance and electric transmission copper row pressure-drop coefficient,
for the storage capacitor module electric discharge minimum voltage that first pulse during rear class converter employing step-down mode allows,
for storage capacitor module rated voltage coefficient of safety during rear class converter employing step-down mode,
for the storage capacitor module electric discharge minimum voltage that first pulse during rear class converter employing buck mode allows,
for storage capacitor module rated voltage coefficient of safety during rear class converter employing buck mode,
for the rated voltage of single storage capacitor module, namely
for
or
,
for the monomer series-connected voltage nonuniformity coefficient of storage capacitor,
for storage capacitor monomer withstand voltage;
(3) the storage capacitor capability value of primary Calculation and power station power supply power match
, concrete mode is:
According to formula
calculate the energy that storage capacitor module needs to supply to first pulse
, then according to formula
primary Calculation goes out and power station power supply power
the storage capacitor capability value matched
;
Wherein,
headed by pulse allow storage capacitor module electric discharge minimum voltage,
for storage capacitor module is to the efficiency of load discharge,
headed by pulse theory energy,
for in power station is during pulsed discharge to the ceiling capacity of pulse supply, by formula
determine,
for power station through prime charge controller and rear class constant-current converter to the efficiency of load energy supply;
(4) to the storage capacitor capability value that described step (3) is tentatively calculated
carry out verification revise and determine storage capacitor module sum
;
(5) to storage capacitor module sum
carry out revising and dividing into groups, concrete mode is:
According to the way of demagnetization power acquisition with rear class converter
will
group storage capacitor module is divided into altogether
group, often group comprises
group storage capacitor module,
should be greater than 1 positive integer, and the storage capacitor module number of each road rear class converters wants consistent, if
do not meet above-mentioned two requirements, then to storage capacitor monomer capacity
after revising according to the following formula, return step (4):
, wherein
for storage capacitor monomer cubage correction coefficient;
If
meet above-mentioned two requirements, then by
group storage capacitor module electrically and be unified into capacitance and be
, rated voltage is
single storage capacitor working group, then all single storage capacitor working group obtained is divided into groups;
(6) carry out process of pulse discharge design, concrete mode is:
When
the theoretical discharge electric current of individual pulse
be greater than
time,
individual normal working group all participates in electric discharge;
When
the theoretical discharge electric current of individual pulse
be greater than
and be less than
time, by comprising
large group of individual storage capacitor working group is discharged;
When
the theoretical discharge electric current of individual pulse
be greater than
and be less than
time, by comprising
the group of individual storage capacitor working group discharges;
When
the theoretical discharge electric current of individual pulse
be less than
time, discharged by single storage capacitor working group, now, if give the
the ceiling capacity that all storage capacitor working groups of individual pulse power supply can discharge is greater than from
the individual pulse energy sum to last pulse, then power station just no longer provides any energy to storage capacitor and load, wherein
;
(7) carry out process of pulse discharge calculating, concrete mode is:
According to formula
calculate the
the energy that after individual pulsed discharge, single storage capacitor working group stores
, according to formula
calculate the
the voltage of single storage capacitor working group after individual pulsed discharge
, according to formula
calculate the
the energy that before individual pulsed discharge, single storage capacitor working group stores
if,
be greater than the maximum storage energy of single storage capacitor working group
, then basis
revise
;
According to formula
calculate the
the voltage of single storage capacitor working group before individual pulsed discharge
, for the voltage before first pulsed discharge
by formula
calculate, the energy that the single storage capacitor working group before first pulsed discharge stores presses formula
value, according to formula
calculate the
the electric current that during individual pulsed discharge, single channel rear class converter flows through;
Wherein,
be
the energy that before individual pulsed discharge, single storage capacitor working group stores,
be
the storage capacitor working group group number of energy supply is participated in during individual pulsed discharge,
value is
,
,
or 1,
for the energy that provides of single storage capacitor working group is given in power station within the discharge interval time, when normal group electric discharge and
time
get 0, by formula in other situation
calculate,
be
during individual pulse
the ceiling capacity that individual storage capacitor working group can discharge, by formula
calculate,
for from
individual pulse to all pulse energy sums of last pulse,
,
for storage capacitor independently discharges coefficient of safety,
for power station supplies the energy of pulse in pulse discharge time, same, normal group electric discharge and
time
get 0, get in other situations
,
by formula
calculate,
for the storage capacitor module electric discharge minimum voltage that last pulse allows;
(8) filter inductance and filtering capacitance is asked for according to the process of pulse discharge result of calculation of described step (7).
2. the storage capacitor of energy storage demagnetization power supply according to claim 1 and filter inductance, electric capacity method for selecting, it is characterized in that, the particular content of described step (4) is:
A) from first pulse, the ceiling capacity sum that can provide in during the ceiling capacity that power station can be provided in discharge interval and pulsed discharge
with the theoretical energy of each pulse
compare, until
be more than or equal to
the theoretical energy of individual pulse
till, it is right then to obtain
each circulation of verification needs the pulse number carrying out verifying
B) by a capacity be
, rated voltage is
storage capacitor as the energy storage module of demagnetization power supply, and progressively discharge calculation is carried out to this module;
C) after discharging to this energy storage module, whether voltage meets and is more than or equal to the storage capacitor module electric discharge minimum voltage that the pulse that calculates in step (2) allows and verifies at every turn, if do not met, then according to
revise
after, return step b), until before in epicycle verification
storage capacitor module that individual pulse allows electric discharge minimum voltage is all less than or equal to after the electric discharge of energy storage module till voltage, and enters step d);
D) according to formula
calculate storage capacitor module sum initial value
, will
be multiplied by
and round, just obtain and power station power
the storage capacitor module sum of the certain Safety Redundancy of consideration of coupling
, then obtain the storage capacitor capacity considering certain Safety Redundancy
;
Wherein,
for power station supplies the ceiling capacity of storage capacitor module, by formula in discharge interval
determine,
for the discharge interval time,
for the efficiency charged to storage capacitor module through prime charge controller in power station,
for the storage capacitor cubage correction coefficient needed,
for tentatively selected storage capacitor monomer capacity,
for storage capacitor module number Safety Redundancy coefficient, its value is greater than 1.
3. the storage capacitor of energy storage demagnetization power supply according to claim 1 and filter inductance, electric capacity method for selecting, is characterized in that, divide into groups as follows in described step (5) to all single storage capacitor working group obtained: will
individual storage capacitor working group is all considered as normal working group,
individual normal working group is divided into two large group, and each large group has
individual storage capacitor working group, then be divided into Liang Ge group by one large group, each group has
individual storage capacitor working group, more each group is divided into
individual smallest group, smallest group is single storage capacitor working group.
4. the storage capacitor of the energy storage demagnetization power supply according to claim 1,2 or 3 and filter inductance, electric capacity method for selecting, it is characterized in that, in described step step (8), rear class converter does not adopt crisscross parallel circuit, asks for filter inductance and filtering capacitance in the following manner:
According to formula
calculate rear class converter and to adopt under step-down mode the
the minimum filter inductance of continuous current mode is met during individual pulsed discharge
, or according to formula
calculate rear class converter and to adopt under buck mode the
the minimum filter inductance of continuous current mode is met during individual pulsed discharge
;
To array
get maximum and obtain inductance value corresponding to normal working group
, by minimum inductance during step-down mode
substitute into formula
meeting the fluctuation of each pulse voltage when trying to achieve rear class converter employing step-down mode is
the minimum filtering capacitance required
, or according to
try to achieve minimum filtering capacitance during rear class converter employing buck mode
, to array
get maximum and obtain filtering capacitance corresponding to normal working group
;
Wherein,
be
the maximum input voltage of rear class converter during individual pulsed discharge,
by formula
try to achieve,
be
the minimum input voltage of rear class converter during individual pulsed discharge,
by formula
try to achieve,
the switch periods of rear class converter,
for inductance Safety Redundancy coefficient,
be
the magnitude of a voltage fluctuation that individual pulse theory discharge voltage allows, by formula
calculate,
allow to be voltage fluctuation coefficient for pulsed discharge, array
meet the minimum filter inductance array of all working group continuous current mode, namely
or
, array
meet the minimum filter capacitor array of all working group voltage fluctuation requirement, namely
or
.
5. the storage capacitor of the energy storage demagnetization power supply according to claim 1,2 or 3 and filter inductance, electric capacity method for selecting, is characterized in that, in described step step (8), rear class converter adopts
the buck circuit of road crisscross parallel or
during the buck-boost circuit of road crisscross parallel, ask for filter inductance and filtering capacitance in the following manner:
First filter inductance value and filter capacitor is tentatively asked for according to the mode identical with method described in claim 4;
Then filter inductance value and filter capacitor is revised in the following manner:
According to following formula, the filter inductance value of trying to achieve in aforesaid way is revised:
；
When adopting buck for rear class converter, filter capacitor need by mode correction below: by revised filter inductance value
bring formula into
again minimum filtering capacitance during rear class converter employing step-down mode is tried to achieve, and to array
get maximum and obtain filtering capacitance corresponding to normal working group;
Adopt the filter capacitor of step-down/up type need by mode correction below for rear class converter:
；
Wherein,
for the coefficient of safety of inductance during converter employing crisscross parallel mode,
for the redundancy coefficient of electric capacity during step-down/up type rear class converter employing crisscross parallel mode.
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| WO2006090112A1 (en) * | 2005-02-24 | 2006-08-31 | Converteam Ltd | Exciter assemblies |
| CN103600823A (en) * | 2013-11-18 | 2014-02-26 | 东南大学 | Energy-storage demagnetizing module, demagnetizing power supply and charge and discharge control method |
| CN104360883A (en) * | 2014-11-12 | 2015-02-18 | 浪潮(北京)电子信息产业有限公司 | Method and system for configuring Raid (Redundant array of independent disks) |
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2015
- 2015-05-13 CN CN201510244584.1A patent/CN104882949B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006090112A1 (en) * | 2005-02-24 | 2006-08-31 | Converteam Ltd | Exciter assemblies |
| CN103600823A (en) * | 2013-11-18 | 2014-02-26 | 东南大学 | Energy-storage demagnetizing module, demagnetizing power supply and charge and discharge control method |
| CN104360883A (en) * | 2014-11-12 | 2015-02-18 | 浪潮(北京)电子信息产业有限公司 | Method and system for configuring Raid (Redundant array of independent disks) |
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