CN104882949B - Storage capacitor and filter inductance, the electric capacity method for selecting of a kind of energy storage demagnetization power supply - Google Patents
Storage capacitor and filter inductance, the electric capacity method for selecting of a kind of energy storage demagnetization power supply Download PDFInfo
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Abstract
The invention discloses a kind of storage capacitor of energy storage demagnetization power supply and filter inductance, electric capacity method for selecting, step are as follows：(1) pulse theory energy balane, is carried out；(2) rated voltage and the monomer series-connected number of electric capacity of storage capacitor module, are determined；(3), calculate and meet all pulse request storage capacitor capacity with power station power supply power match；(4), storage capacitor module number and rear class converter are grouped, and pulsed discharge scheme is formulated according to group result；(5) step by step calculation, is carried out according to discharge scheme, obtains suitable filter inductance, capacitance.The present invention uses multiple redundancy mechanism, ensures inside total output circuit and converter all Safety Redundancies.
Description
Technical Field
The invention belongs to the field of ship demagnetization, and particularly relates to an energy storage capacitor, a filter inductor and a capacitor selection method of an energy storage demagnetization power supply.
Background
The earth is a huge magnet, steel is a material easy to be magnetized, and ships or submarines constructed by steel can be magnetized when being in the magnetic field of the earth for a long time. As long as the naval vessel is sailing on the ocean, the magnetized naval vessel must generate a magnetic field, and if the magnetic field is not eliminated, the magnetized naval vessel is easily attacked by weapons such as a magnetic torpedo, a torpedo and the like or becomes a target of magnetic detection equipment. The naval vessel has two magnetic fields, one is an induction magnetic field, and the magnetic field is counteracted by a self-demagnetizing system on the naval vessel; the other is a fixed magnetic field which is periodically removed by powering on a degaussing station or vessel.
The installation of a degaussing system on a ship is the most effective means for protecting the magnetism of the ship. The ship demagnetizing system mainly comprises a ship demagnetizing winding, demagnetizing control equipment and a demagnetizing power supply. The demagnetizing power supply is a power amplifier of demagnetizing equipment, and it provides a controllable DC current to the ship demagnetizing winding according to the control signal output by the controller, and it is an important component of demagnetizing equipment. The demagnetizing power supply is generally used on warships and submarines of military, and must have extremely high reliability, especially in wartime. In a degaussing power supply which relies on super capacitor energy storage and power station power supply, there are two energy sources providing energy to the pulse discharge, one being the power station and one being the super capacitor. The sum of pulse discharge energy is unchanged, and the power of the power station can be reduced by increasing the capacity of the super capacitor; conversely, the capacity of the super capacitor can be reduced by increasing the capacity of the power station. The power of the power station and the number of the groups of the super capacitors must be reasonably designed, so that the capacities of the power station and the super capacitors are perfectly matched, the impact on a power grid when the demagnetizing power supply is started is reduced, and meanwhile, the extremely high reliability and redundancy of the demagnetizing power supply must be ensured.
In view of the above performance requirements for the degaussing power supply, it is necessary to provide a method for selecting the capacity of the energy storage capacitor, the filter inductor and the capacitor, which can ensure that the degaussing power supply has extremely high redundancy reliability.
Disclosure of Invention
The technical problem is as follows: the invention provides a method for selecting a filter inductor and a capacitor of a post-stage converter, which can obtain the capacity of an energy storage capacitor matched with the power of a preceding-stage power station according to different pulse parameter requirements of a demagnetizing power supply and meet the requirements of pulse discharge. The method designs a capacitor module discharging scheme adopting a multiple redundancy mechanism, so that the total filter inductance is reduced, more importantly, the reliability of the degaussing power supply is greatly improved, and the requirements of military industry are met.
The technical scheme is as follows: the energy storage degaussing power supply aimed at by the method of the invention consists of a rectifier, a charging controller, an energy storage super capacitor, a post-stage constant current converter, a current reversing device and a system monitor; the system monitor is communicated with the charging controller, the energy storage super capacitor, the rear constant current converter and the current reversing device through communication lines; the degaussing power supply system receives alternating current energy of an alternating current power station, and provides intermittent pulse current with alternating positive and negative and gradual attenuation for a load after links of rectification, energy storage, conversion, commutation and the like.
The invention relates to a method for selecting an energy storage capacitor, a filter inductor and a capacitor of an energy storage degaussing power supply, which comprises the following steps:
(1) Calculating the accumulated energy E from the 1 st pulse to the ith pulse of the energy-storing degaussing power supply i The concrete mode is as follows:
according to formula I i ＝I 1 ×(1-k ΔI ) i-1 Calculating theoretical discharge current I of ith pulse in exponential decay mode i Or according to formula I i ＝I 1 Theoretical discharge current I of ith pulse in (I-1) multiplied by Delta I calculation equal difference attenuation mode i ；
According to the formula U i ＝I i ×R L Calculating the theoretical discharge voltage U of the ith pulse i According to the formula P i ＝U i ×I i Calculating theoretical discharge power P of ith pulse i According to the formula Q i ＝P i ×T on Calculating theoretical energy Q of ith pulse i According to the formulaCalculating the cumulative energy E from the 1 st pulse to the ith pulse i ；
Wherein i is a pulse serial number and has a value range of 1-N pulse ，N pulse Is the total number of pulses, I 1 First pulse theoretical discharge current, k ΔI Is the exponential decay coefficient of the pulse current, delta I is the current equal difference decay tolerance, R L Is a load resistance, T on The value range of the single pulse discharge time, namely the pulse width, j is the pulse serial number, and is 1-i;
(2) The rated voltage of the energy storage capacitor module and the number of the capacitor monomers connected in series are determined, and the specific mode is as follows:
according to the formula U ic-b-min ＝(U i /d buck-max +Δu)×k R Calculating the minimum discharge voltage U of the ith pulse allowed energy storage capacitor module when the post-stage converter adopts a voltage reduction mode ic-b-min Or according to the formula U ic-b-b-min ＝[(1-d b-b-max )×U i ÷d b-b-max +Δu]×k R Calculating the post-stage variationThe minimum discharge voltage U of the ith pulse allowed energy storage capacitor module when the converter adopts a buck-boost mode ic-b-b-min ；
The rated voltage U of the single energy storage capacitor module is determined according to the following mode c-N : according to the formula U c-N-b ＝U 1c-b-min ×K safe-u-b Calculating the rated voltage U of a single energy storage capacitor module when the post-converter adopts a voltage reduction mode c-N-b Or according to the formula U c-N-b-b ＝U 1c-b-b-min ×K safe-u-b-b Calculating the rated voltage U of a single energy storage capacitor module when the post-stage converter adopts a buck-boost mode c-N-b-b Or taking nominal voltage U directly c-N-b-b ＝U c-N-b ；
According to a formula N' series ＝U c-N /U c-single ×K c-nonuniformity Calculating serial number N 'of capacitor monomers of single energy storage capacitor module' series If N' series If not, rounding and correcting the capacitor towards the positive infinite direction to obtain the corrected serial number N of the energy storage capacitor monomers series ；
Wherein d is buck-max Is the maximum duty ratio of the switching tube in the voltage reduction mode, d b-b-max For the maximum duty ratio of the switching tube in the buck-boost mode, delta u is the input and output voltage difference compensation of the converter, k R For the internal resistance of the energy storage capacitor and the voltage drop coefficient of the transmission copper bar, U 1c-b-min The minimum voltage, K, of the energy storage capacitor module which is allowed by the first pulse when the voltage reduction mode is adopted by the post converter safe-u-b Rated voltage safety factor of energy storage capacitor module when voltage reduction mode is adopted for post converter, U 1c-b-b-min The energy storage capacitor module allowed by the first pulse discharges the minimum voltage K when the backward converter adopts a voltage increasing and reducing mode safe-u-b-b Rated voltage safety factor of energy storage capacitor module when buck-boost mode is adopted for post converter, U c-N For a rated voltage of a single energy-storage capacitor module, i.e. U c-N Is U c-N-b Or U c-N-b-b ，K c-nonuniformity For the series voltage non-uniformity coefficient of the energy storage capacitor unit, U c-single The voltage resistance value of the energy storage capacitor monomer is set;
(3) Preliminarily calculating the capacity value c 'of an energy storage capacitor matched with the power supply power of the power station' sum The concrete mode is as follows:
according to the formula W 1c-offer ＝Q 1 -W g-on-max Calculating the energy W required to be supplied to the first pulse by the energy storage capacitor module 1c-offer Then according to the formulaPreliminarily calculating the power P of the power station grid Matched energy storage capacitor capacity value c' sum ；
Wherein, U 1c-min Minimum discharge voltage, eta, of energy-storage capacitor module allowed by first pulse c-load Efficiency of discharging a load for an energy storage capacitor module, Q 1 Theoretical energy of first pulse, W g-on-max For the maximum energy supplied by the station to the pulse during the pulse discharge, from the formula W g-on-max ＝P grid ×T on ×η g-load Determination of eta g-load The efficiency of supplying energy to a load by a power station through a front-stage charging controller and a rear-stage constant current converter;
(4) The energy storage capacitor capacity value c 'obtained in the step (3) in a preliminary calculation way' sum Checking and correcting, and determining the total number N of the energy storage capacitor modules c-sum ；
(5) To the total number N of the energy storage capacitor modules c-sum The method for correcting and grouping comprises the following specific steps:
number of lines N of post-stage converter adopted according to demagnetizing power supply converter Will N c-sum The energy storage capacitor module is divided into N converter Groups, each group containing N parallel ＝N c-sum /N converter Group energy storage capacitor module, N parallel Should be a positive integer greater than 1, and the number of the energy storage capacitor modules configured in each post-stage converter is consistent if N is parallel If the two requirements are not met, the capacity c of the energy storage capacitor monomer is set single And (4) after correction according to the following formula, returning to the step (4): c. C single ＝c single ×k c-single Wherein k is c-single The correction coefficient is the monomer capacity of the energy storage capacitor;
if N is present parallel Satisfy the above two requirements, then from N parallel The energy storage capacitor module is electrically connected in parallel to form a capacitor with a capacity of c single-module ＝N parallel ×c single /N series Rated voltage of U c-N Then grouping all the obtained single energy storage capacitor working groups;
(6) The pulse discharge process is designed in the following specific mode:
theoretical discharge current I when the ith pulse i Is greater than I 1 At 2, N converter All the normal working groups participate in discharging;
theoretical discharge current I when the ith pulse i Is greater than I 1 A/4 to less than I 1 At/2, from the group consisting of N converter Discharging a large group of/2 working groups of energy storage capacitors;
theoretical discharge current I when the ith pulse i Is greater than I 1 8 to less than I 1 At/4, from the group consisting of N converter Discharge is carried out on a subgroup of 4 working groups of energy storage capacitors;
theoretical discharge current I when the ith pulse i Is less than I 1 At/8, discharging is carried out by a single energy storage capacitor working group, and at the moment, if the maximum energy which can be released by all the energy storage capacitor working groups for supplying power to the ith pulse is larger than the sum of pulse energies of the ith pulse to the last pulse, the power station does not provide any energy for the energy storage capacitor and the load any more, wherein i<N pulse ；
(7) Calculating the pulse discharge process, wherein the specific mode is as follows:
according to the formulaCalculating the energy Q stored by a single energy storage capacitor working group after the discharge of the ith pulse i-after According to the formulaCalculating the voltage U of a single energy storage capacitor working group after the discharge of the ith pulse i-after According to the formula Q i-before ＝Q i-1-after +W g-off-one Calculating the energy Q stored by a single energy storage capacitor working group before the discharge of the ith pulse i-before If Q is i-before Greater than the maximum stored energy Q of a single working group of energy storage capacitors one-max Then according to Q i-before ＝Q c-one-max Correction of Q i-before ；
According to the formulaCalculating the voltage U of a single energy storage capacitor working group before the discharge of the ith pulse i-before For the voltage U before the first pulse discharge 1-before According to formula U 1-before ＝U c-N Calculating the energy stored by the working group of the single energy storage capacitor before the discharge of the first pulse according to the formula Q 1-before ＝Q c-one-max Taking values according to formula I i-single ＝I i /M i Calculating the current flowing through the single-path post-stage converter during the ith pulse discharge;
wherein Q is i-before Energy stored by a single working bank of storage capacitors before discharge of the ith pulse, M i Number of working groups of energy-storage capacitors participating in energy supply during discharge of ith pulse, M i Value of N converter 、N converter /2、N converter /4 or 1,W g-off-one Providing energy for the power station to the working group of the single energy storage capacitor in the pulse discharge interval time when the normal group is discharged and Q is i-c-M ×η c-load ≥K Q ×Q i-sum-back-last Time W g-off-one Take 0 otherwise by the formula W g-off-one ＝P grid ×T off ÷N converter ×M i ×η g-c Calculated as Q i-c-M For the ith pulse time M i The maximum energy which can be released by each energy storage capacitor working group is represented by a formulaCalculated as Q i-sum-back-last Is the sum of all pulse energies from the ith pulse to the last pulse, i is more than or equal to N pulse ，K Q Independent discharge safety factor of energy storage capacitor, W g-on-offer Supplying the power station with pulsed energy during the pulse discharge time, likewise, discharging in the normal group and Q i-c-M ×η c-load ≥K Q ×Q i-sum-back-last Time W g-on-offer Take 0, otherwise take W g-on-offer ＝P grid ×T on ÷N converter ×M i ×η g-load ，Q c-one-max By the formula Q c-one-max ＝12×c single-module ×U 2 c-N The calculation is carried out to obtain the total weight of the material,discharging the minimum voltage for the energy storage capacitor module allowed by the last pulse;
(8) And solving a filter inductance value and a filter capacitance value according to the calculation result of the pulse discharge process.
Further, the specific content of step (4) is as follows:
a) Starting from the first pulse, the sum W of the maximum energy which can be provided by the power station in the pulse discharge interval and the maximum energy which can be provided in the pulse discharge period g-offer-max ＝W g-off-max +W g-on-max With theoretical energy Q of each pulse i Comparison until W g-offer-max Greater than or equal to the theoretical energy Q of the ith pulse i To give p-c' sum The number N of pulses needing to be checked in each cycle of checking check ＝i-1；
b) One capacity is c' sum Rated voltage of U c-N The energy storage capacitor is used as an energy storage module of the demagnetizing power supply, and the module is subjected to gradual discharge calculation;
c) Checking whether the voltage of the energy storage module after each discharge meets the minimum discharge voltage of the energy storage capacitor module which is greater than or equal to the pulse permission calculated in the step (2), and if not, according to c' sum ＝c′ sum ×(1+K c-sum-correction ) C 'is corrected' sum And then, returning to the step b) until the first N in the current round of verification check D) until the minimum discharge voltage of the energy storage capacitor module allowed by each pulse is less than or equal to the voltage of the energy storage module after discharge, and entering the step d);
d) According to formula N' c-sum ＝(N seires ×c′ sum )/c single Calculating initial value N 'of total number of energy storage capacitor modules' c-sum N 'is' c-sum Multiplying by K safe-c-N And rounding to obtain the power P of the power station grid Matched energy storage capacitor module total number N considering certain safety redundancy c-sum And then obtaining the energy storage capacitance C considering certain safety redundancy sum ＝N c-sum ×c single ÷N series ；
Wherein, W g-off-max The maximum energy supplied to the energy storage capacitor module by the power station in the pulse discharge interval is represented by the formula W g-off-max ＝P grid ×T off ×η g-c Determination of T off For the pulse discharge interval time, η g-c Efficiency, K, for charging the energy-storage capacitor module from the pre-charge controller of the power station c-sum-correction For the required correction factor of the capacity of the storage capacitor, c single For preliminarily selected individual capacity, K, of the energy-storing capacitor safe-c-N The safe redundancy coefficient is the number of the energy storage capacitor modules, and the value of the safe redundancy coefficient is larger than 1.
Further, all the obtained single energy storage capacitor working groups are grouped according to the following method in the step (5): will N converter All the energy storage capacitor working groups are regarded as normal working groups, N converter The normal working groups are divided into two groups, each group has N converter 2 working groups of energy storage capacitors, and dividing one large group into two small groups, each group having N converter 4 working groups of energy storage capacitors, and dividing each group into N converter And the minimum group is a single energy storage capacitor working group.
Further, in step (8), the post-stage converter does not adopt an interleaved parallel circuit, and the filter inductance and the filter capacitance are obtained as follows:
according to the formulaCalculating the minimum filter inductance L which meets the requirement of continuous inductance current when the ith pulse of the post-stage converter adopts a voltage reduction mode to discharge i-Lvbo-buck Or according to a formulaCalculating the minimum filter inductance L meeting the continuity of the inductive current when the ith pulse of the post-stage converter discharges in a buck-boost mode i-Lvbo-b-b ；
Pair array [ L 1-Lvbo L 2-Lvbo ggg L Npulse-Lvbo ]Obtaining the inductance L corresponding to the normal working set by taking the maximum value normal The minimum inductance L in the step-down mode min ＝L normal Substitution formulaWhen the post-stage converter adopts a voltage reduction mode, the requirement that the fluctuation of each pulse voltage is delta U is solved i Required minimum filter capacitance value C i-Lvbo-b Or according toObtaining the minimum filter capacitance C when the post converter adopts the buck-boost mode i-Lv-b-b Logarithmic set [ C ] 1-Lvbo C 2-Lvbo ggg C Npulse-Lvbo ]Taking the maximum value to obtain the filter capacitance value C corresponding to the normal working group normal ；
Wherein, U i-in-max Maximum input voltage, U, of the subsequent converter during discharge of the ith pulse i-in-max By the formula U i-in-max ＝U i-before /k R To obtain U i-in-min Minimum input voltage, U, of the subsequent converter at discharge of the ith pulse i-in-min By the formula U i-in-min ＝U i-after /k R To obtain T s Switching period, K, of the subsequent converter L For safety redundancy factor of inductance, Δ U i-ripple The allowable voltage fluctuation value for the ith pulse theoretical discharge voltage is represented by the formula delta U i-ripple ＝K ΔU ×U i Calculated, array [ L 1-Lvbo L 2-Lvbo ggg L Npulse-Lvbo ]Minimum filter inductance array satisfying continuity of all active set inductor currents, i.e. [ L ] 1-Lvbo-buck L 2-Lvbo-buck gggL Npulse-Lvbo-buck ]Or [ L 1-Lvbo-b-b L 2-Lvbo-b-b gggL Npulse-Lvbo-b-b ]Array [ C ] 1-Lvbo C 2-Lvbo ggg C Npulse-Lvbo ]Minimum filter capacitor array satisfying voltage ripple requirements of all banks, i.e. [ C ] 1-Lvbo-b C 2-Lvbo-b ggg C Npulse-Lvbo-b ]Or [ C 1-Lvbo-b-b C 2-Lvbo-b-b ggg C Npulse-Lvbo-b-b ]。
Further, in step (8), the post-converter adopts N inter-parallel Buck circuit or N with staggered and parallel paths inter-parallel When the buck-boost circuits are connected in parallel in a staggered mode, the filter inductance and the filter capacitance are obtained according to the following mode:
firstly, preliminarily calculating a filter inductance value and a filter capacitance according to the following mode:
according to the formulaCalculating the minimum filter inductance L which meets the requirement of continuous inductance current when the ith pulse of the post-stage converter adopts a voltage reduction mode to discharge i-Lvbo-buck Or according to a formulaCalculating the minimum filter inductance L meeting the continuity of the inductive current when the ith pulse of the post-stage converter discharges in a buck-boost mode i-Lvbo-b-b ；
Pair array [ L 1-Lvbo L 2-Lvbo gggL x-1-Lvbo ]Obtaining the inductance L corresponding to the normal working set by taking the maximum value normal To the array [ L ] x-Lvbo L x+1-Lvbo ggg L Npulse-Lvbo ]Obtaining inductance L corresponding to the special group of small current by taking the maximum value special The minimum inductance L in the step-down mode min ＝L normal Or L min ＝L special Respectively substituted into the formulasWhen the post-stage converter adopts a voltage reduction mode, the requirement that the fluctuation of each pulse voltage is delta U is solved i Required minimum filter capacitance value C i-Lvbo-b Or according toObtaining the minimum filter capacitance C when the post converter adopts the buck-boost mode i-Lv-b-b ；
Pair array [ C 1-Lvbo C 2-Lvbo ggg C x-1-Lvbo ]Taking the maximum value to obtain the filter capacitance value C corresponding to the normal working group normal Logarithmic set [ C ] x-Lvbo C x+1-Lvbo ggg C Npulse-Lvbo ]Taking the maximum value to obtain the filter capacitance C corresponding to the special group of small current special ；
The filter inductance and filter capacitance are then modified as follows:
the filter inductance value obtained in the above manner is corrected according to the following equation:
L′ normal ＝L normal /N 2 inter-parallel ×K parallel-L or L' special ＝L special /N 2 inter-parallel ×K parallel-L ；
When the post converter adopts a step-down type, the filter capacitor is corrected according to the following mode: the corrected filter inductance value L min ＝L′ normal Substituting into formulaRe-calculating the filter capacitance C corresponding to the normal working group normal Filter capacitance value C corresponding to special set of small currents special ；
For the post converter, a buck-boost converter is adopted, and the filter capacitor is corrected according to the following mode:
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-L Factor of safety, K, of the inductance when the converter is in a staggered parallel connection parallel-C The redundancy coefficient of the capacitor is obtained when the buck-boost type post-stage converter adopts a staggered parallel connection mode.
Has the beneficial effects that: compared with the prior art, the invention has the following advantages:
the invention considers certain safety redundancy when determining the number of the super capacitor groups, each discharging stage comprises a redundancy mechanism when designing the discharging scheme of the super capacitor module, the normal discharging groups have mutual standby redundancy, and the inside of the post converter is also added with the redundancy mechanism, namely N inner-parallel The + 1-path parallel redundancy mechanism further improves the reliability of the degaussing power supply, namely each converter circuit has redundancy, the total output circuit has redundancy, and the reliability is very high. Theoretically, the maximum pulse rate (the ratio of the pulse amplitude to the average value) of the total output current of the multiphase multiple chopper circuit is inversely proportional to the square of the number of phases, and the pulse frequency is increased, so that when the maximum pulse rate of the output current is controlled to be constant, the inductance of a smoothing reactor required by the multiphase multiple chopper circuit is greatly reduced compared with that of a single-unit chopper circuit. The average current born by each step-down circuit or step-up and step-down circuit is small, the switching device is easy to select, the switching frequency is correspondingly improved, and the requirement of the filter inductance can be further reduced.
Drawings
FIG. 1 is a logic block diagram of a degaussing power supply system according to the present invention;
FIG. 2 illustrates a schematic diagram of a degaussing power supply system according to the present invention;
FIG. 3 is a flowchart of the process of the present invention;
FIG. 4 is a discharge diagram of the present invention when calculating the capacity value of the energy storage capacitor matching the power supply of the power station;
FIG. 5 is a schematic diagram of capacitor module grouping according to the present invention;
FIG. 6 is a typical output current waveform of a degaussing power supply according to the present invention;
FIG. 7 is a diagram of the relationship between the required power of the power station and the number of capacitor banks according to the present invention;
FIG. 8 is a schematic diagram of a capacitor module grouping according to a discharge scheme of the present invention;
FIG. 9 is a schematic diagram of the grouping of "3+3" capacitor modules within a single large group in a discharge scheme designed in accordance with the present invention;
FIG. 10 is a schematic diagram of a six-phase, six-fold buck-boost circuit in an interleaved parallel configuration in accordance with the present invention;
fig. 11 is a waveform diagram of a degaussing power supply simulation pulse current output designed according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further specifically described below with reference to the drawings and examples.
The high-reliability energy-storage degaussing power supply aimed by the method consists of a rectifier 1, a charging controller 2, an energy-storage super capacitor 3, a post-stage constant-current converter 4, a current reversing device 5 and a system monitor 6; the rectifier 1, the charging controller 2, the energy storage super capacitor 3, the post-stage constant current converter 4 and the current commutation device 5 are sequentially connected in series, the system monitor 6 is communicated with the charging controller 2, the energy storage super capacitor 3, the post-stage constant current converter 4 and the current commutation device 5 through communication lines, and the structure diagram is shown in fig. 1. The degaussing power supply system receives alternating current energy of an alternating current power station, and provides intermittent pulse current with alternating positive and negative and gradual attenuation for a load after links of rectification, energy storage, conversion, commutation and the like.
Fig. 5 shows a typical output current waveform of a degaussing power supply. The technical method of the present invention will be described below by selecting and designing an energy storage capacitor, a filter inductor, and a capacitor for a degaussing power supply with the following performance indexes.
Performance indexes are as follows: a. output current: 50-4000A is continuously adjustable;
b. output voltage: the voltage is continuously adjustable from 0VDC to 650 VDC;
c. load resistance: less than or equal to 0.1625 omega;
d. output current waveform: pulse type positive and negative alternation, gradual attenuation according to an equal difference or exponential law, overshoot: less than or equal to 2% (as a single pulse);
e. pulse width: 5-10s;
f. pulse interval: 15-20s;
g. the number of pulses is: 50, the number of the channels is 50;
(1) Calculating the cumulative energy E from the 1 st pulse to the 50 th pulse of the energy storage degaussing power supply i ；
The parameters used were: first pulse theoretical discharge current I 1 =4000A, current equal difference attenuation tolerance Δ I =80A, load resistance R L =0.1625 Ω, single pulse discharge time T on =10s, exponential decay coefficient of pulse current k ΔI =0.1, total number of pulses N pulse =50. The pulse energy data calculated according to the arithmetic difference shown in table 1 and the theoretical pulse data calculated according to the attenuation coefficient 0.1 shown in table 2 were obtained by calculation.
TABLE 1 pulse energy data calculated by arithmetic mean
TABLE 2 theoretical pulse data calculated as attenuation coefficient 0.1
(2) The rated voltage of the energy storage capacitor module and the number of the capacitor monomers connected in series are determined, and the specific mode is as follows:
substituting the first pulse theoretical discharge voltage into the formula U 1c-b-min ＝(U 1 /d buck-max +Δu)×k R Calculating to obtain the minimum capacitor discharge voltage U allowed by the first pulse when the post-stage converter adopts a voltage reduction mode 1c-b-min =703.6V, rated voltage U of single energy 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 Calculating serial number N 'of capacitor monomers of single energy storage capacitor module' series =318.42, corrected number N of energy storage capacitor monomers connected in series series =320, wherein d buck-max ＝0.97，Δu＝0，k R ＝1.05，K c-nonuniformity ＝1.22，U c-single ＝2.7V，K safe-u-b ＝1.228。
(3) Preliminarily calculating an energy storage capacitor capacity value c 'matched with power supply power of a power station' sum 。
The current exponential attenuation and the voltage increase and decrease mode of the post converter are selected, and the power supply power P of the power station grid And selecting 1000kW as an example to design the filter inductance and the filter capacitance in the next step.
According to the formula W 1c-offer ＝Q 1 -W g-on-max Calculating the energy W required to be supplied to the first pulse by the energy storage capacitor module 1c-offer =17900kJ; according to the formulaPreliminarily calculating the power P of the power station grid Matched energy storage capacitor capacity value c' sum ＝60.18F；
Wherein, the energy storage capacitor module permitted by the first pulse discharges the minimum voltage U 1c-min =292.5V, efficiency eta of energy storage capacitor module to load discharge c-load =0.9, efficiency eta of power station supplying energy to load via front-stage charging controller and rear-stage constant current converter g-load ＝0.81；
4) The energy storage capacitor capacity value c 'obtained in the step (3) in a preliminary calculation way' sum Checking and correcting, and determining the total number N of the energy storage capacitor modules c-sum ：
According to the formula W g-offer-max ＝W g-off-max +W g-on-max Calculating the sum W of the maximum energy provided by the power station in the pulse discharge interval and the pulse discharge period g-offer-max =20150kJ, this energy has been greater than the theoretical energy Q of the 3 rd pulse under exponential decay 3 Only the first two pulses need to be checked, i.e. N check ＝2；
As shown in FIG. 4, one capacity is c' sum Rated voltage of U c-N The energy storage capacitor is used as an energy storage module of the demagnetization power supply, the module is subjected to gradual discharge calculation, and the capacity c 'is calculated' sum Checking and correcting coefficient K according to capacity of energy storage capacitor c-sum-correction Correction is carried out for =0.1 to obtain c 'after correction' sum ＝72.82F；
According to formula N' c-sum ＝(N seires ×c′ sum )/c single Calculating initial value N 'of total number of energy storage capacitor modules' c-sum =8, N' c-sum Multiplying the safety redundancy coefficient K by the number of the energy storage capacitor module safe-c-N The power P of the power station is obtained by rounding off the integer of =1.4 grid Matching the total number N of energy storage capacitor modules considering certain safety redundancy c-sum =12, then get the energy storage capacitance C considering certain safety redundancy sum ＝N c-sum ×c single ÷N series ＝112.5F。
The relation between the required power supply and the number of capacitor sets (without considering safety redundancy) under four conditions of the voltage reduction mode of the current equal-difference attenuation rear-stage converter, the voltage increase/decrease mode of the current equal-difference attenuation rear-stage converter, the voltage reduction mode of the current exponential attenuation rear-stage converter and the voltage increase/decrease mode of the current exponential attenuation rear-stage converter is respectively calculated, as shown in table 3, table 4 and fig. 7. Wherein the capacity of the capacitor is c single =3000F, and the first pulse power P 1 With the power supply power P of the plant grid The ratio is defined as the power output ratio K p I.e. K p ＝P 1 /P grid 。
TABLE 3 required power supply and number of capacitor banks calculated by voltage reduction
TABLE 4 required power supply and number of capacitor banks calculated in buck-boost manner
(5) To the total number N of the energy storage capacitor modules c-sum =12 correction and grouping:
number of lines N of post-stage converter adopted according to demagnetizing power supply converter =12 will N c-sum The group energy storage capacitor modules are divided into 12 groups in total and do not need to be corrected. Fig. 8 and fig. 9 are schematic diagrams illustrating a grouping scheme of the energy storage capacitor modules. Each energy storage capacitor working group forms an independent module, each independent module is provided with an independent charger and an independent post converter, and the post converters are connected in parallel to provide discharge pulse current for a load. The 12 energy storage capacitor working groups are divided into two large groups, and each group is provided with 6 energy storage capacitor working groups; each large group is divided into 2 small groups, and each small group has 3 working groups of energy storage capacitors.
(6) The pulse discharge process is designed in the following specific mode:
when the pulse current is larger than 2000A, the 12 energy storage capacitor working groups are all in discharge; the 12 energy storage capacitor working groups are divided into two large groups, each group is provided with 6 energy storage capacitor working groups, the pulse current is less than 2000A, and when the pulse current is more than 1000A, only one of the two large groups participates in discharging; each large group is divided into 2 small groups, each small group is provided with 3 energy storage capacitor working groups, the pulse current is less than 1000A, and when the pulse current is more than 500A, only one of the two small groups participates in discharging; when the discharge current is less than 500A, only 1 group of capacitors participate in the discharge.
According to the above capacitor module grouping scheme, the current data in the theoretical pulse data table calculated from the previous attenuation coefficient of 0.1 can be obtained: (1) stage one: from the 1 st pulse to the 7 th pulse, the total number of the 7 pulses is supplied by 12 groups of energy storage capacitor working groups; (2) and a second stage: from the 8 th pulse to the 14 th pulse, 7 pulses are counted, and 6 groups of energy storage capacitor working groups participate in energy supply; (3) and a third stage: from the 15 th pulse to the 20 th pulse, 6 pulses are counted, and 3 groups of energy storage capacitor working groups participate in energy supply; (4) and a fourth stage: from the 21 st pulse to the 50 th pulse, a total of 30 pulses are completely independently powered by a single working group of storage capacitors. And in the first 3 stages, if the energy which can be released by the capacitor module currently participating in discharging is larger than the accumulated sum of the energy of the current pulse to the 18 th pulse, the capacitor module is completely discharged, and the power station does not provide any energy any more until all pulses are discharged.
(7) Calculating a pulse discharge process;
table 5 and table 6 show the voltage before and after pulse discharge of a single capacitor module calculated in the pulse discharge process, respectively, and table 7 shows the current flowing through the single-circuit post-stage converter during discharge of each pulse calculated in the pulse discharge process.
TABLE 5 Single capacitor Module Pre-pulse discharge Voltage
TABLE 6 Voltage of single capacitor module after pulse discharge
TABLE 7 Current flowing through the one-way post-converter during each pulse discharge
(8) Calculating a filter inductance value and a filter capacitance value according to the pulse discharge process calculation result of the step (7):
calculating the voltage before and after each pulse discharge according to the discharge process design, and substituting into formulaIn the method, the minimum inductance L required by the ith pulse discharge when the post-stage converter adopts a buck-boost mode is calculated i-Lvbo-b-b The calculated data are shown in table 8, wherein the operating frequency of the switching tube is set to f =6kHz, and the switching period T is set to s ＝1/f。
TABLE 8 inductance value calculated in buck-boost mode of 1000kW power station current exponential decay converter
Obtaining the maximum value of the calculated 50 inductance values, and obtaining the corresponding inductance value L =114.45 (mu H) of the normal working group, wherein K is taken L And (2). In the scheme, the post-stage converter of each group of modules is formed by connecting 6 Buck-boost circuits in parallel in a staggered mode to form 6-phase 6-fold chopper circuits, 5 paths of Buck-boost circuits work normally, 1 path of Buck-boost circuits serves as redundant standby, the current of each switching tube is 100A, the working frequency of the switching tube of the current of the level can be higher, and the 6-phase 6-fold chopper circuits further reduce the requirements on filter inductance. Therefore, the inductance value obtained as above is corrected: l' = L/25 × 2=9.16 (μ H). According to the formulaThe voltage stabilizing capacitance when the subsequent converter employs the step-up/step-down method is obtained, and the obtained capacitance values are shown in table 9.
TABLE 9 Voltage-stabilizing capacitance value of 1000kW current exponential decay post-stage converter in power station power by adopting voltage boosting and reducing mode
The power of a power station can be obtained by 1000kW, the current index is attenuated, and when a back-stage converter adopts a voltage boosting and reducing mode, the filter capacitance value C' =3150172 ÷ 25 multiplied by 1.2=151208 (mu F) corresponding to a normal working group is obtained, wherein when the voltage boosting and reducing back-stage converter adopts an interleaving parallel mode, the redundancy coefficient K of a capacitor parallel-C ＝1.2。
Fig. 11 shows a simulation waveform diagram of two pulse current outputs at the first four stages of the degaussing power supply designed according to the embodiment of the present invention, where the pulse current has been commutated, and it can be seen that both the rising edge and the falling edge of the pulse meet the requirement of less than 1 s.
The scheme has the advantages that the redundancy characteristic is good, at least 40% of safety redundancy is considered when the number of the super capacitor groups is determined, when the discharge scheme of the super capacitor module is designed, each discharge stage comprises a redundancy mechanism, the normal discharge groups are mutually standby redundancy, the redundancy mechanism is also added in the post-stage converter, namely the 5+1-path parallel redundancy mechanism is added, the reliability of the demagnetizing power supply is further improved, namely, each converter circuit has redundancy, a total output circuit has redundancy, and the reliability is very high. The design current of each module is 500A, the actual working maximum current is 333A, the selection range of a switch tube of each module is large, and the working frequency can be higher, so that the numerical value of a filter inductor can be reduced, in addition, the super capacitor only has the problem of series voltage balance, the problem of parallel current balance does not exist, and the hardware cost in the aspect of super capacitor balance can be reduced.
Claims (5)
1. A method for selecting an energy storage capacitor, a filter inductor and a capacitor of an energy storage degaussing power supply is characterized by comprising the following steps:
(1) Calculating the accumulated energy E from the 1 st pulse to the ith pulse of the energy storage degaussing power supply i The concrete mode is as follows:
according to formula I i ＝I 1 ×(1-k ΔI ) i-1 Calculating theoretical discharge current I of ith pulse in exponential decay mode i Or according to formula I i ＝I 1 Theoretical discharge current I of ith pulse in (I-1) multiplied by Delta I calculation equal difference attenuation mode i ；
According to the formula U i ＝I i ×R L Calculating the theoretical discharge voltage U of the ith pulse i According to the formula P i ＝U i ×I i Calculating theoretical discharge power P of ith pulse i According to the formula Q i ＝P i ×T on Calculating theoretical energy Q of ith pulse i According to the formulaCalculating the cumulative energy E from the 1 st pulse to the ith pulse i ；
Wherein i is a pulse serial number and ranges from 1 to N pulse ，N pulse Is the total number of pulses, I 1 First pulse theoretical discharge current, k ΔI Is the exponential decay coefficient of the pulse current, delta I is the current equal difference decay tolerance, R L Is a load resistance, T on The value range of the single pulse discharge time, namely the pulse width, j is the pulse serial number, and is 1-i;
(2) The rated voltage of the energy storage capacitor module and the number of the capacitor monomers connected in series are determined, and the specific mode is as follows:
according to the formula U ic-b-min ＝(U i /d buck-max +Δu)×k R Calculating the minimum discharge voltage U of the ith pulse allowed energy storage capacitor module when the post-stage converter adopts a voltage reduction mode ic-b-min Or according to the formula U ic-b-b-min ＝[(1-d b-b-max )×U i ÷d b-b-max +Δu]×k R Calculating the minimum discharge voltage U of the ith pulse allowed energy storage capacitor module when the post-stage converter adopts a buck-boost mode ic-b-b-min ；
The rated voltage U of the single energy storage capacitor module is determined according to the following mode c-N : according to the formula U c-N-b ＝U 1c-b-min ×K safe-u-b Calculating the rated voltage U of a single energy storage capacitor module when the post-converter adopts a voltage reduction mode c-N-b Or according to the formula U c-N-b-b ＝U 1c-b-b-min ×K safe-u-b-b Calculating the rated voltage U of a single energy storage capacitor module when the post-stage converter adopts a buck-boost mode c-N-b-b Or taking nominal voltage U directly c-N-b-b ＝U c-N-b ；
According to a formula N' series ＝U c-N /U c-single ×K c-nonuniformity Calculating the number N 'of capacitor single bodies connected in series of single energy storage capacitor module' series If N' series If not, rounding and correcting the capacitor towards the positive infinite direction to obtain the corrected serial number N of the energy storage capacitor monomers series ；
Wherein d is buck-max Is the maximum duty ratio of the switching tube in the voltage reduction mode, d b-b-max For the maximum duty ratio of the switching tube in the buck-boost mode, delta u is the input and output voltage difference compensation of the converter, k R For the internal resistance of the energy storage capacitor and the voltage drop coefficient of the transmission copper bar, U 1c-b-min The minimum voltage, K, of the energy storage capacitor module allowed by the first pulse when the post-stage converter adopts a voltage reduction mode safe-u-b Rated voltage safety factor of energy storage capacitor module when voltage reduction mode is adopted for post converter, U 1c-b-b-min The energy storage capacitor module allowed by the first pulse discharges the minimum voltage K when the backward converter adopts a voltage increasing and reducing mode safe-u-b-b Rated voltage safety factor of energy storage capacitor module when buck-boost mode is adopted for post converter, U c-N Rated for a single storage capacitor module, i.e. U c-N Is U c-N-b Or U c-N-b-b ，K c-nonuniformity For the non-uniform coefficient of series voltage of the energy storage capacitor monomer, U c-single For energy storage capacitor monomerA pressure value;
(3) Preliminarily calculating an energy storage capacitor capacity value c 'matched with power supply power of a power station' sum The concrete mode is as follows:
according to the formula W 1c-offer ＝Q 1 -W g-on-max Calculating the energy W required to be supplied to the first pulse by the energy storage capacitor module 1c-offer Then according to the formulaPreliminarily calculating the power P of the power station grid Matched energy storage capacitor capacity value c' sum ；
Wherein, U 1c-min Minimum discharge voltage, eta, of energy-storage capacitor module allowed by first pulse c-load Efficiency of discharging a load for an energy storage capacitor module, Q 1 Theoretical energy of first pulse, W g-on-max For the maximum energy supplied by the station to the pulse during the pulse discharge, from the formula W g-on-max ＝P grid ×T on ×η g-load Determination of eta g-load The efficiency of supplying energy to a load by a power station through a front-stage charging controller and a rear-stage constant current converter;
(4) The energy storage capacitor capacity value c 'preliminarily calculated in the step (3)' sum Checking and correcting and determining the total number N of the energy storage capacitor modules c-sum ；
(5) To the total number N of the energy storage capacitor modules c-sum The method for correcting and grouping comprises the following specific steps:
number of lines N of post-stage converter adopted according to demagnetizing power supply converter Will N c-sum The energy storage capacitor module is divided into N converter Groups, each group containing N parallel ＝N c-sum /N converter Group energy storage capacitor module, N parallel Should be a positive integer greater than 1, and the number of the energy storage capacitor modules configured in each post-stage converter is consistent if N is parallel If the two requirements are not met, the capacity c of the energy storage capacitor monomer is set single And (4) after correction according to the following formula, returning to the step (4): c. C single ＝c single ×k c-single Wherein k is c-single The correction coefficient is the monomer capacity of the energy storage capacitor;
if N is present parallel Satisfy the above two requirements, then from N parallel The energy storage capacitor module is electrically connected in parallel to form a capacitor with a capacity of c single-module ＝N parallel ×c single /N series Rated voltage of U c-N Then grouping all the obtained single energy storage capacitor working groups;
(6) The pulse discharge process is designed in the following specific mode:
theoretical discharge current I when the ith pulse i Is greater than I 1 At 2, N converter All the normal working groups participate in discharging;
theoretical discharge current I when the ith pulse i Is greater than I 1 A/4 to less than I 1 At/2, from the group consisting of N converter Discharging a large group of/2 working groups of energy storage capacitors;
theoretical discharge current I when the ith pulse i Is greater than I 1 8 to less than I 1 At/4, from the group consisting of N converter Discharge is carried out on a subgroup of 4 working groups of energy storage capacitors;
theoretical discharge current I when the ith pulse i Is less than I 1 At the time of/8, discharging is carried out by a single energy storage capacitor working group, at the time, if the maximum energy which can be released by all the energy storage capacitor working groups for supplying power to the ith pulse is larger than the sum of pulse energies of the ith pulse to the last pulse, the power station does not provide any energy for the energy storage capacitor and the load, wherein i is less than N pulse ；
(7) Calculating the pulse discharge process, wherein the specific mode is as follows:
according to the formulaCalculating the energy Q stored by a single energy storage capacitor working group after the discharge of the ith pulse i-after According to the formulaCalculating the voltage U of a single energy storage capacitor working group after the discharge of the ith pulse i-after According to the formula Q i-before ＝Q i-1-after +W g-off-one Calculating the energy Q stored by a single energy storage capacitor working group before the discharge of the ith pulse i-before ，Q i-1-after For the energy stored by the working group of single energy-storing capacitor after discharging the (i-1) th pulse, if Q i-before Greater than the maximum stored energy Q of a single working group of energy storage capacitors c-one-max Then according to Q i-before ＝Q c-one-max Correction of Q i-before ；
According to the formulaCalculating the voltage U of a single energy storage capacitor working group before the discharge of the ith pulse i-before For the voltage U before the discharge of the head pulse 1-before According to formula U 1-before ＝U c-N Calculating the energy stored by the working group of the single energy storage capacitor before the discharge of the first pulse according to the formula Q 1-before ＝Q c-one-max Taking values according to formula I i-sinale ＝I i /M i Calculating the current flowing through the single-path post-stage converter during the ith pulse discharge;
wherein Q is i-before Energy stored by a single working bank of storage capacitors before discharge of the ith pulse, M i Number of working groups of energy-storage capacitors participating in energy supply during discharge of ith pulse, M i Value of N converter 、N converter /2、N converter /4 or 1,W g-off-one Providing energy for the power station to the single energy storage capacitor working group in the pulse discharge interval time when the normal group is discharged and Q is i-c-M ×η c-load ≥K Q ×Q i-sum-back-last W during discharge of special groups of time or small current g-off-one Take 0 otherwise by the formula W g-off-one ＝P grid ×T off ÷N converter ×M i ×η g-c Calculated, Q i-c-M For the ith pulse time M i The maximum energy which can be released by the working group of the energy storage capacitor isFormula (II)Calculated as Q i-sum-back-last Is the sum of all pulse energies from the ith pulse to the last pulse, i is more than or equal to N pulse ，K Q Independent discharge safety factor of energy storage capacitor, W g-on-offer Supplying the power station with pulsed energy during the pulse discharge time, likewise, discharging in the normal group and Q i-c-M ×η c-load ≥K Q ×Q i-sum-back-last Time W g-on-offer Take 0, otherwise take W g-on-offer ＝P grid ×T on ÷N converter ×M i ×η g-load ，Q c-one-max By the formulaThe calculation is carried out to obtain the total weight of the material,minimum voltage, η, discharged for the energy-storage capacitor module allowed by the last pulse g-c The charging efficiency of the capacitor module is improved for the power grid through a charger;
(8) And (4) solving a filter inductance and a filter capacitance according to the pulse discharge process calculation result of the step (7).
2. The method for selecting the energy storage capacitor, the filter inductor and the filter capacitor of the energy storage degaussing power supply according to claim 1, wherein the step (4) comprises the following specific steps:
a) Starting from the first pulse, the sum W of the maximum energy which can be provided by the power station in the pulse discharge interval and the maximum energy which can be provided in the pulse discharge period g-offer-max ＝W g-off-max +W g-on-max With theoretical energy Q of each pulse i Comparison until W g-offer-max Greater than or equal to the theoretical energy Q of the ith pulse i To give p c' sum The number N of pulses needing to be checked in each cycle of checking check ＝i-1
b) One capacity is c' sum Rated voltage of U c-N The energy storage capacitor is used as an energy storage module of the demagnetizing power supply, and the module is subjected to gradual discharge calculation;
c) Checking whether the voltage of the energy storage module after each discharge meets the minimum discharge voltage of the energy storage capacitor module which is greater than or equal to the pulse permission calculated in the step (2), and if not, according to c' sum ＝c′ sum ×(1+K c-sum-correction ) C 'is corrected' sum And then, returning to the step b) until the first N in the current round of verification check D) until the minimum discharge voltage of the energy storage capacitor module allowed by each pulse is less than or equal to the voltage of the energy storage module after discharge, and entering the step d);
d) According to a formula N' c-sum ＝(N series ×c′ sum )/c single Calculating an initial value N 'of the total number of the energy storage capacitor modules' c-sum N 'is' c-sum Multiplying by K safe-c-N And rounding to obtain the power P of the power station grid Matched energy storage capacitor module total number N considering certain safety redundancy c-sum Then obtaining the energy storage capacitance C considering certain safety redundancy sum ＝N c-sum ×c single ÷N series ；
Wherein, W g-off-max The maximum energy supplied to the energy storage capacitor module by the power station in the pulse discharge interval is represented by the formula W g-off-max ＝P grid ×T off ×η g-c Determination of T off Is the pulse discharge interval time, eta g-c Efficiency, K, for charging the energy-storage capacitor module from the pre-charge controller of the power station c-sum-correction For the required correction factor of the capacity of the storage capacitor, c sinqle For preliminarily selected individual capacity, K, of the energy-storing capacitor safe-c-N The safe redundancy coefficient is the number of the energy storage capacitor modules, and the value of the safe redundancy coefficient is larger than 1.
3. The method for selecting a storage capacitor, a filter inductor and a capacitor of a stored energy degaussing power supply according to claim 1, wherein the method for selecting a storage capacitor, a filter inductor and a filter capacitor of a stored energy degaussing power supply comprises the following steps in the step (5)All the single energy storage capacitor working groups are grouped: will N converter All the energy storage capacitor working groups are regarded as normal working groups, N converter The normal working groups are divided into two groups, each group has N converter 2 working groups of energy storage capacitors, and dividing one large group into two small groups, each group having N converter 4 working groups of energy storage capacitors, and dividing each group into N converter And the minimum group is a single energy storage capacitor working group.
4. The method for selecting the storage capacitor, the filter inductor and the filter capacitor of the energy storage degaussing power supply according to claim 1, 2 or 3, wherein in the step (8), the filter inductor and the filter capacitor are obtained by the following method without using an interleaved parallel circuit in the subsequent converter:
according to the formulaCalculating the minimum filter inductance L which meets the requirement of continuous inductance current when the ith pulse of the post-stage converter adopts a voltage reduction mode to discharge i-Lvbo-buck Or according to a formulaCalculating the minimum filter inductance L meeting the continuity of the inductive current when the ith pulse of the post-stage converter discharges in a buck-boost mode i-Lvbo-b-b ；
To arrayObtaining the inductance L corresponding to the normal working group by taking the maximum value, and obtaining the minimum inductance L in the voltage reduction mode min Formula of substituting = LObtaining the voltage fluctuation of each pulse as delta U when the post-stage converter adopts the voltage reduction mode i Required minimum filter capacitance value C i-Lvbo-b Or according toObtaining the minimum filter capacitance C when the post converter adopts the buck-boost mode i-Lv-b-b Logarithmic arrayTaking the maximum value to obtain a filter capacitance value C corresponding to the normal working group;
wherein, U i-in-max Maximum input voltage, U, of the subsequent converter during discharge of the ith pulse i-in-max By the formula U i-in-max ＝U i-before /k R To obtain U i-in-min Minimum input voltage, U, of the subsequent converter during discharge of the ith pulse i-in-min By the formula U i-in-min ＝U i-after /k R To obtain T s Switching period, K, of the subsequent converter L For safety redundancy factor of inductance, Δ U i-ripple The allowable voltage fluctuation value for the ith pulse theoretical discharge voltage is represented by a formula delta U i-ripple ＝K Δu ×U i Calculated as K ΔU Voltage ripple factor allowed for pulsed discharge, arrayMinimum filter inductance array for continuous inductor current for normal operation, i.e.OrArray of elementsMinimum filter capacitor arrays meeting all workgroup voltage ripple requirements, i.e.Or
5. The method for selecting the storage capacitor, filter inductor and capacitor of an energy storage degaussing power supply according to claim 1, 2 or 3, wherein in the step (8), the post-stage converter adopts N inter-parallel Buck circuit or N with staggered ways connected in parallel inter-parallel When the buck-boost circuits are connected in parallel in a staggered mode, the filter inductance and the filter capacitance are obtained according to the following mode:
firstly, preliminarily determining a filter inductance value and a filter capacitance in the same manner as the method described in claim 4;
the filter inductance and filter capacitance are then modified as follows:
the filter inductance value obtained in the above manner is corrected according to the following equation:
when the post-stage converter adopts the step-down type, the filter capacitor needs to be corrected according to the following mode: the corrected filter inductance value L min Equation of substitution of = LRe-calculating the minimum filter capacitance value when the post-stage converter adopts the voltage reduction mode, and counting the number of the groupsObtaining a filtering capacitance value corresponding to the normal working group by taking the maximum value;
for a post-stage converter, a buck-boost filter capacitor needs to be corrected according to the following mode:
wherein, K parallel-L Factor of safety of the inductor, K, when the converter is in a cross-parallel mode parallel-C Redundancy coefficient of capacitor when the buck-boost type post-stage converter adopts a staggered parallel connection mode, N inter-parallel The number of the staggered parallel circuits adopted by the post converter is L 'the filter inductance value obtained after correction, and C' the post converter obtained after correction adopts a buck-boost filter capacitor.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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Patent Citations (3)
| 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) |
Non-Patent Citations (1)
| Title |
|---|
| 一种用于电磁发射的电感电容混合型储能脉冲电源;刘秀成等;《弹道学报》;20090930;第21卷(第3期);全文 * |
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