CN104868538A - Method for determining energy-storage capacitance and filter inductance and capacitance of energy-storage demagnetization power supply - Google Patents

Abstract

The invention discloses a method for determining the energy-storage capacitance and filter inductance and capacitance of an energy-storage demagnetization power supply, and the method comprises the following steps: (1) calculating the theoretical energy of a pulse; (2) determining rated voltage of an energy-storage capacitor module group, and the number of capacitor monomers in series connection; (3) calculating the capacity of an energy-storage capacitor, wherein the capacity is matched with a supply power of a power station and meets the requirements of all pulses; (4) grouping the energy-storage capacitor module group and a rear-stage converter, and making a scheme of pulse discharge according to the grouping results; (5) carrying out gradual calculation according to the scheme of pulse discharge, and obtaining the proper filter inductance value and capacitance value. The method employs a multi-redundancy mechanism, and guarantees that a total output circuit and the interior of the converter have safe redundancy. A small-current special group guarantees the precision of a small pulse current, the total inductance value is reduced, and the device cost is reduced.

Description

A kind of storage capacitor of energy storage demagnetization power supply and filter inductance, electric capacity defining method

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 defining method.

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 defining method 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 defining method 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 defining method, 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 I}for 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-nonuniformity}calculate 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-nonuniformity}for 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, X 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, discharged by large group of comprising X/2 storage capacitor working group;

When the theoretical discharge electric current I of i-th pulse _ibe greater than I ₁/ 8 and be less than I ₁when/4, discharged by the group comprising X/4 storage capacitor working group;

When the theoretical discharge electric current I of i-th pulse _ibe less than I ₁when/8, discharged by single small area analysis specific group, now, if the ceiling capacity can discharging to all storage capacitor working groups of i-th pulse power supply is greater than from the individual pulse energy sum to xth-1 pulse of i-th (i<x-1), then power station just no longer provides any energy to storage capacitor and load, and wherein x is the sequence number of the 1st pulse that small area analysis specific group is powered;

(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-beforewith the single storage capacitor working group voltage U before the electric discharge of the 1st the pulse x powered by small area analysis specific group _x-beforeby formula U _1-before=U _x-before=U _c-Ncalculate, the energy that single storage capacitor working group corresponding before this two pulsed discharge stores presses formula Q _1-before=Q _x-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 X, X/2, X/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-x-1}time or small area analysis specific group electric discharge time W _g-off-oneget 0, by formula W in other situation _g-off-one=P _grid× T _off÷ X × 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 Q _i-c-M=0.5 × c _{single-module}× (U ² _i-before-U ² _x-1-c-min) calculate, Q _{i-sum-back-x-1}for from i-th (i>=x-1) individual pulse to all pulse energy sums of xth-1 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-x-1}time or small area analysis specific group electric discharge time, W _g-on-offerget 0, in other situations, get W _g-on-offer=P _grid÷ X × M _i× T _on× η _g-load, Q _c-one-maxby formula $Q_{c-\mathrm{one}-\max }=\frac{1}{2}\&times;c_{\sin \mathrm{gle}-\mathrm{mod}\mathrm{ule}}\&times;{U^2}_{c-N}$ Calculate;

(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-correction}for 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 divided into X normal working group and Y redundancy of effort group by " X+Y " scheme, each working group forms an independently module, each block configuration is charger and independently rear class converter independently, the backward load in parallel of rear class converter provides pulse current, X normal working group is divided into two large group, each large Zu YouX/2Ge storage capacitor working group, Liang Ge group is divided into again by one large group, there be X/4 storage capacitor working group in each group, Y redundancy of effort group forms Y small area analysis specific group respectively, wherein Y>=2, X+Y=N _converter.

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 _x-1-Lvbo] get maximum and obtain inductance value L corresponding to normal working group _normal, to array $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ 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 $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ Get maximum and obtain filtering capacitance C corresponding to small area analysis specific group _special;

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, K _{Δ U}allow to be voltage fluctuation coefficient for pulsed discharge, array [L _1-Lvbol _2-Lvboggg L _x-1-Lvbo] for meeting the minimum filter inductance array of normal working group continuous current mode, i.e. [L _1-Lvbo-buckl _2-Lvbo-buckgggL _{x-1-Lvbo-buck}] or [L _1-Lvbo-b-bl _2-Lvbo-b-bgggL _x-1-Lvbo-b-b], array $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ For meeting the minimum filter inductance array of small area analysis specific group continuous current mode, namely $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}-\mathrm{buck}}& L_{x+1-\mathrm{Lvbo}-\mathrm{buck}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}-\mathrm{buck}}\end{array}\right]$ Or $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}-b-b}& L_{x+1-\mathrm{Lvbo}-b-b}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}-b-b}\end{array}\right],$ Array [C _1-Lvboc _2-LvbogggC _x-1-Lvbo] for meeting the minimum filter capacitor array of normal working group voltage fluctuation requirement, i.e. [C _1-Lvbo-bc _2-Lvbo-bgggC _x-1-Lvbo-b] or [C _1-Lvbo-b-bc _2-Lvbo-b-bgggC _x-1-Lvbo-b-b], array $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ For meeting the minimum filter capacitor array of small area analysis specific group voltage fluctuation requirement, namely $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}-b}& L_{x+1-\mathrm{Lvbo}-b}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}-b}\end{array}\right]$ Or $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}-b-b}& L_{x+1-\mathrm{Lvbo}-b-b}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}-b-b}\end{array}\right].$

Further, in step (8), rear class converter adopts N _{inter-parallel}the buck circuit of road crisscross parallel or N _{inter-parallel}during 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 $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ 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 $\left[\begin{array}{cccc}{L}_{x-\mathrm{Lvbo}}& L_{x+1-\mathrm{Lvbo}}& \mathrm{ggg}& L_{N_{\mathrm{pulse}}-\mathrm{Lvbo}}\end{array}\right]$ 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, mutual standby redundancy between regular picture group, mutual standby redundancy between small area analysis specific group, rear class constant-current converter inside equally also adds redundancy scheme, namely adopts N _{inter-parallel}+ No. 1 converter 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 booster 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.The particularly setting of small area analysis specific group, not only ensures the precision of the electric current when small-pulse effect discharges, and reduces the inductance value of filter inductance, and the volume of demagnetization power supply is reduced.

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 10+2 discharge scheme electric capacity module grouping schematic diagram that Fig. 8 designs for the present invention;

" 2+3 " electric capacity module grouping schematic diagram in single large group in the 10+2 discharge scheme that Fig. 9 designs for the present invention;

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 the design of storage capacitor capacity and filter inductance, 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-nonuniformity}calculate 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 10+2 electric capacity mould splits prescription case schematic diagram.10 groups is normal working group, and 2 groups is redundancy group.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.10 storage capacitor working groups are divided into two large group, and often group has 5 storage capacitor working groups; Each large group is divided into again 2 groups, and there are 2 or 3 storage capacitor working groups in each group; Remaining 2 storage capacitor working groups (" 2 " in 10+2 scheme) form small area analysis specific group, are called small area analysis specific group A and small area analysis specific group B.

(6) carry out process of pulse discharge design, concrete mode is:

When pulse current is greater than 2000A, 10 storage capacitor working groups all participate in electric discharge; 10 storage capacitor working groups are divided into two large group, and often group has 5 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 2 or 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; Remaining 2 storage capacitor working groups (" 2 " in 10+2 scheme) form small area analysis specific group, be called small area analysis specific group A and small area analysis specific group B, when discharging current is less than 500A, 1 group of electric capacity is only had to participate in electric discharge, the filter inductance of this group electric capacity is through particular design, can current precision be ensured, turn reduce the total inductance value of filter inductance.

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 10 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 5 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 2 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 small area analysis specific 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 20th pulse energy accumulation sum, then discharged by complete electric capacity module, do not reoffer any energy with power station afterwards, until complete all pulsed discharges.

(7) process of pulse discharge calculating is carried out;

The electric current that when table 5 is depicted as voltage, each pulsed discharge before and after the single electric capacity module pulsed discharge that calculated by process of pulse discharge, single channel rear class converter flows through.

Table 5 process of pulse discharge result of calculation

(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 6, 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 6 power station

To front 20 the inductance value maximizings calculated, the inductance value L of the correspondence of normal working group group can be obtained _normal=114.45 (μ H) 30 inductance value maximizing, can obtain the inductance value L of the correspondence of small area analysis specific group _special=16.13 (μ H), wherein get K _l=2.In this scheme, the rear class converter often organizing module is made up of 6 step-up/step-down circuit crisscross parallels, Figure 10 shows that the heavy chopper circuit of 6 phases 6.5 tunnels normally work, and 1 tunnel is for subsequent use as redundancy, each switching tube electric current 100A, and 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 ' _normal=L _normal/ 25 × 2=9.16 (μ H), L ' _special=L _special/ 6=1.29 (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 7.

Electric capacity of voltage regulation value during table 7 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, the filtering capacitance C ' that normal working group is corresponding _normal=319498 ÷ 25 × 1.2=15336 μ F and filtering capacitance C ' corresponding to small area analysis specific group _special=13691087 ÷ 25 × 1.2=657172 μ F, 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 and do not consider the demagnetization power supply exemplary pulse current output waveform figure that the specific embodiment of the invention designs that paired pulses carries out positive and negative checker temporarily in emulation, 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, mutual standby redundancy between small area analysis specific 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 600A, real work maximum current is 400A, 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 defining method, 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 correction, 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 small area analysis specific 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 individual to the pulse energy sum of individual pulse, then power station just no longer provides any energy to storage capacitor and load, wherein for the sequence number of the 1st pulse that small area analysis specific group is powered, ;

(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 with the 1st pulse of being powered by small area analysis specific group electric discharge before single storage capacitor working group voltage by formula calculate, the energy that single storage capacitor working group corresponding before this two 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 or small area analysis specific group electric discharge 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 is to the all pulse energy sums of individual 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 or small area analysis specific group electric discharge time, get 0, get in other situations , by formula calculate;

(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 defining method, 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 defining method, 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 presses " " scheme is divided into individual normal working group and individual redundancy of effort group, each working group forms an independently module, and each block configuration is charger and independently rear class converter independently, and the backward load in parallel of rear class converter provides pulse current, 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, individual redundancy of effort group is formed respectively individual small area analysis specific group, wherein , .

4. the storage capacitor of the energy storage demagnetization power supply according to claim 1,2 or 3 and filter inductance, electric capacity defining method, it is characterized in that, in described 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 , to array get maximum and obtain inductance value corresponding to small area analysis specific group , by minimum inductance during step-down mode or substitute into formula respectively 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 , to array get maximum and obtain filtering capacitance corresponding to small area analysis specific 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 for meeting the minimum filter inductance array of normal working group continuous current mode, namely or , array for meeting the minimum filter inductance array of small area analysis specific group continuous current mode, namely or , array for meeting the minimum filter capacitor array of normal working group voltage fluctuation requirement, namely or , array for meeting the minimum filter capacitor array of small area analysis specific 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 defining method, is characterized in that, in described 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 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;

or ;

During for rear class converter employing buck, by the filter capacitor of mode correction below: by revised filter inductance value bring formula into again the filtering capacitance that normal working group is corresponding is asked for the filtering capacitance corresponding with small area analysis specific group ;

Step-down/up type is adopted for rear class converter, by the filter capacitor of mode correction below:

；

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.