CN115001294A - Circulating pulse high-power degaussing main power system - Google Patents
Circulating pulse high-power degaussing main power system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 46
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 20
- 230000001939 inductive effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000000630 rising effect Effects 0.000 claims description 13
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- 238000013016 damping Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 238000012937 correction Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 claims description 3
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- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000005347 demagnetization Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a cyclic pulse high-power degaussing main power supply system which comprises a transformer, a three-phase rectifier, a battery energy storage unit, a DC/DC buck-boost converter and a chopping commutation unit, wherein the transformer is connected with the three-phase rectifier; the input end of the three-phase rectifier is connected with the commercial power, and the output end of the three-phase rectifier is connected with the input end of the battery energy storage unit; the output end of the battery energy storage unit is connected with the input end of the DC/DC buck-boost converter, the output end of the DC/DC buck-boost converter is connected with the input end of the chopping commutation unit, the output end of the chopping commutation unit is connected with the input end of the large-inductance load, and an energy leakage device is arranged between the DC/DC buck-boost converter and the chopping commutation unit; the quick release of the load current can be ensured, and the damage to circuit components in the energy release loop due to the overhigh terminal voltage at the two ends of the inductor can be avoided; the demand of a power supply system on the capacity of a power grid is effectively reduced, the impact on the power grid is avoided, and the power supply quality is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a cyclic pulse high-power main power supply system.
Background
When a ship is influenced by geomagnetism, and is impacted by magnetic fields and stress in the process of construction and navigation, and the like, a magnetic field can be generated in the space around the ship, and the magnetic field becomes an important threat source for the ship to be attacked by magnetic exploration and magnetic weapons. Therefore, the demagnetizing device has important safety and strategic significance for demagnetizing ships, defending the ships from being discovered by detecting instruments or attacked by magnetic weapons in water, improving the safety of the ships in and out of bases, ports, navigation and activities in a war area, and improving the magnetic protection capability of the ships and the important guarantee of the ship vitality and fighting capacity.
Usually, the purpose of degaussing a ship is achieved by generating a magnetic field through an electrified coil. The pulse power supply can generate various power supplies with strong electric pulse power output, so that the working current required by ship degaussing is provided for the coil through the pulse power supply. With the use of large ships, the attack required by the demagnetization system is larger and larger, and when the power supply system is applied to a high-power and frequent charge and discharge field, if the pulse power required by the working load is input by the power grid, the requirements on the power grade and the power supply capacity of the power supply system are higher, and impact and harmonic pollution can be brought to the power grid.
The traditional pulse power supply adopts a mode of a power frequency transformer and silicon controlled rectifier rectification, and in the mode, the power required by the load is completely provided by the power supply, so that the requirement of equipment with medium and low power grades can be met. However, for a high-power-class device, the work load needs an intermittent pulse current with a sufficiently large pulse amplitude, and if the pulse power is input by the mains supply, the intermittent pulse current puts higher requirements on the power class and the power supply capacity of the power supply system, and can bring impact and harmonic pollution to the power grid. In order to meet the requirement of high power grade in a working load, a power supply system is provided with a plurality of motor amplifier parts, but a mechanical rotating part improves the control time constant and the adjusting time of the whole system, so that the system has poor reliability, the device has large volume and low efficiency, and the design, the maintenance, the miniaturization and the motorization of the whole power supply system are not facilitated.
Disclosure of Invention
The invention aims to solve the problems that the existing high-power demagnetization main power supply system brings impact and harmonic pollution to a power grid, and has poor system reliability, large device volume and low efficiency.
Aiming at the problems, the technical scheme adopted by the invention is as follows:
a cyclic pulse high-power degaussing main power supply system comprises a transformer, a three-phase rectifier, a battery energy storage unit, a DC/DC buck-boost converter and a chopping commutation unit; the input end of the three-phase rectifier is connected with the commercial power, and the output end of the three-phase rectifier is connected with the input end of the battery energy storage unit; the output end of the battery energy storage unit is connected with the input end of the DC/DC buck-boost converter, the output end of the DC/DC buck-boost converter is connected with the input end of the chopping commutation unit, the output end of the chopping commutation unit is connected with the input end of the large-inductance load, and an energy leakage device is arranged between the DC/DC buck-boost converter and the chopping commutation unit;
a transformer: the voltage class is used for converting commercial power into voltage class required by a three-phase rectification circuit;
three-phase rectifier: the active damping feedback control of the capacitor current is adopted and used for converting three-phase alternating current after voltage reduction of the transformer into direct current, the direct current and the battery energy storage device supply power to a large-inductance load at the rising stage of the pulse current, and the direct current supplies power to a rear-stage battery energy storage device during the pulse current in the pulse gap period, so that the battery energy storage device stores energy and prepares for supplying power to the load when the next pulse current rises;
a battery energy storage device: the required working current is provided for the load, and the working requirement of the load is met; when the instantaneous power required by the load supplied by the main power supply system reaches megawatt level, the power level required by the load cannot be met only by supplying power to the load by the three-phase rectification circuit, so that higher requirements can be provided for the power level of the main power supply system and the capacity of a power supply, and impact and harmonic pollution can be brought to a power grid. The battery energy storage device is connected to the direct current side of the three-phase rectifier of the main power supply system, so that the working current requirement required by a load is met, the requirement on the capacity of a power grid is reduced, the working current requirement required by the load is met, and the power grid is prevented from being impacted; when the pulse working current is in a rising or stable stage, the three-phase rectifier and the battery energy storage device jointly supply power to the inductive load; when the pulse working current is in a descending stage, the battery energy storage device is charged through the three-phase rectifier, the state of charge of the energy storage device is maintained within a certain range, and preparation is made for the next pulse current to ascend. The battery energy storage device is a high-safety high-multiplying-power lithium iron phosphate battery pack and is formed by connecting a plurality of battery monomers in series and parallel, the state quantity in the use process of the battery is monitored in real time through a battery management system, the safety of the use process of the battery is guaranteed, and the use efficiency of the battery is improved. The energy storage system has bidirectional power regulation capability, and the energy storage element is utilized to flexibly store and release electric energy, so that real-time power balance in the system can be ensured, the frequency characteristic is improved, and the problem of voltage fluctuation is solved;
DC/DC buck-boost converter: the method comprises the following steps that a triple double-tube Buck-Boost topological structure and a double-tube simultaneous-on and simultaneous-off control strategy are adopted, boosting or reducing voltage is carried out on input direct-current voltage, and a voltage grade required by a load is output;
a chopping and reversing unit: the alternating current source is used for carrying out positive and negative commutation on the input current and providing positive and negative alternating current for a load;
the energy leakage device comprises: the device is used for realizing the rapid absorption of the energy of the large-inductance load in a mode of segmented switching of the resistor in the pulse current reduction stage; when the energy leakage device is connected to a power supply system, load current and the load form a follow current loop through the energy leakage device and the chopping commutation unit, the energy stored in the inductive load is absorbed by the energy leakage device, and the inductive current is reduced.
The main power supply system receives alternating current energy of an alternating current power grid, and after links of voltage reduction, rectification, energy storage, conversion, reversing and the like, intermittent pulse current with alternating positive and negative and attenuation change according to rules is provided for a large inductance load, and the high-power-density and high-energy-density alternating current power supply system has the characteristics of high power density and high energy density. The amplitude and duration of the main power supply output current may be adjusted and controlled by a controller or the like of the main power supply system.
Further, the three-phase rectifier comprises a rectifier side inductor L 1 Filter capacitor C f And network side inductance L 2 Rectifier side inductance L 1 Filter capacitor C f And network side inductance L 2 Together forming an LCL filter; compared with the L filter, the LCL filter comprises a filter capacitor C f The bypass path is provided for high-frequency harmonic current, and on the premise of realizing the same filtering effect, the sum of two inductance values in the LCL filter is smaller than the inductance value of a single inductance value in the L filter, so that the size is smaller and the cost is lower.
Further, the method for the three-phase rectifier to adopt the capacitance current active damping feedback control comprises the following steps: the suppression of the resonance peak of the LCL filter is realized through the capacitance current; physical quantities under the abc coordinate system are converted into an alpha beta coordinate system to be controlled, so that active and reactive decoupling is realized; and (3) introducing capacitance current feedback by controlling the side current of the alternating current network, wherein Hi1 is a feedback coefficient of the capacitance current feedback, and finally outputting a PWM control signal to control the on-off of a switching tube of the three-phase rectifier bridge.
Further, the DC/DC Buck-Boost converter adopts a triple double-tube Buck-Boost topological structure to perform Boost/Buck conversion on the output voltage of the energy storage device so as to drive a load inductor; when the pulse working current is in a rising stage, the Buck-Boost circuit works in the mode of Buck and Buck-Boost; when the pulse working current is in a steady-state stage, the Boost-Buck circuit works in a Buck-Boost mode and a Buck mode; when the pulse load current is in the rising and stable stage, the double-tube Buck-Boost circuit works, and when the pulse current is in the falling and intermittent stage, the circuit device is turned off. The double-tube Buck-Boost lifting piezoelectric device not only has the function of lifting voltage, but also has the advantages of low voltage stress of a power device, few passive elements, same input and output polarities and the like, and is suitable for occasions with wider input voltage change range.
Further, the two-tube on-off control strategy is as follows: working in a Buck-Boost mode; electricity at a given currentAn in-stream loop count; given value of current I o_ref And the converter output current i o A correction part of the given value of the current inner ring after passing through the PI controller obtains a converter duty ratio signal through the current inner ring controller and the three-phase current-sharing controller; i.e. i Lave Is the average current in a single switching cycle, where I L Can be calculated from the following formula:
in the formula I o_ref Is a given value of current, D is a duty ratio, M ref For a given modulation ratio, V in Inputting voltage for a double-tube Buck-Boost converter; r L The equivalent internal resistance L of the inductor is the inductor, and d is a differential symbol;
in order to avoid the voltage jump at two ends of the load inductor and the oscillation of the output capacitor and the load inductor, the given waveform of the inductive current is designed into a piecewise function with continuous first-order derivative; linear setting is adopted in the initial stage of rising, the voltage of a direct current bus is fully utilized, and the rated current can be ensured to be achieved within 1 s; when the load is close to the rated current, the load is switched to a trigonometric function, the voltage at two ends of the load inductor is ensured to be continuous, and the numerical expression of the function is as follows:
x is a dimensionless quantity characterizing the current; y is a dimensionless quantity characterizing the voltage.
Furthermore, the energy leakage device comprises a capacitor energy leakage circuit, wherein the capacitor energy leakage circuit comprises 4 resistor segmented switching branch circuits, 1 resistor branch circuit and a freewheeling diode Dmm; the resistance subsection switching branch circuit and the resistance branch circuit form a plurality of paths and are connected in parallel and then are connected in series with the fly-wheel diode Dm, the circuit after series connection is connected on a main circuit between the external DC/DC buck-boost converter and the chopping commutation unit, and a main circuit switching tube Sm is further arranged on the main circuit close to the fly-wheel diode Dm; each resistor subsection switching branch circuit is provided with a resistor element and a branch switching tube element in series; a resistance element is arranged on the resistance branch circuit; and a switching tube element on the resistor subsection switching branch circuit is connected with the anode end of the fly-wheel diode Dm.
Further, said S m A fully-controlled device is adopted for a main circuit switch tube of the energy discharging device; by controlling S m To realize the connection or disconnection of the energy leakage device in the power supply system; d m Is a freewheeling diode, when the energy-discharging device absorbs the load energy, the inductive current passes through the resistor and D m Afterflow; the energy release device comprises four resistance branches and an energy consumption resistor R 1 、R 2 、R 3 、R 4 Connected in parallel, wherein the energy-consuming resistor R 1 、R 2 、R 3 Respectively in fully-controlled switching devices S 1 、S 2 、S 3 Are connected in series; by controlling S 1 、S 2 、S 3 The on and off of the energy release device are used for adjusting the total resistance of the energy release device circuit;
the front stage of the energy discharging device is connected with the DC/DC buck-boost converter, and the rear stage of the energy discharging device is connected with a large inductance load through a chopping commutation unit; when the pulse current rises and maintains a fixed amplitude for a period of time, the main circuit switch tube S of the energy discharging device m The energy leakage device is always in a conducting state and is in a standby state; when the pulse current is in a descending stage, a switching tube in the energy discharging device acts, and the device enters a working state; meanwhile, in order to meet the reduction rate that the current is reduced to 0 in a short time, the inductance energy leakage is realized in a resistor segmented switching mode; the energy-saving control circuit can rapidly absorb all energy of a large inductive load in a short time and ensure the safe operation of a switching device in an energy-discharging loop.
When the inductive current is reduced to 0, the energy-releasing deviceCentral switch tube S 1 、S 2 、S 3 All are turned off, the main circuit switch tube S m And the load inductor is in a conducting state again, the energy leakage of the load inductor is completed, and the energy leakage device is in a standby state.
Furthermore, the chopping commutation unit comprises an H-bridge structure formed by 4 thyristors and outputs a pulse type current waveform with alternating positive and negative and regular amplitude attenuation; when the thyristors VT1 and VT4 are conducted, positive pulse current is output; when the thyristors VT2, VT3 are turned on, a negative pulse current is output.
The invention has the advantages and characteristics that:
1. the cycle pulse high-power degaussing main power supply system has the characteristics of high power density and high energy density, and the requirement of the power supply system on the capacity of a power grid is effectively reduced by accessing the battery energy storage device, so that the impact on the power grid is avoided, and the power supply quality is improved. The battery energy storage device has bidirectional power regulation capacity, and the energy storage element is used for flexibly storing and releasing electric energy, so that real-time power balance in the system can be ensured, the frequency characteristic is improved, and the problem of voltage fluctuation is solved.
2. According to the circulating pulse high-power demagnetization main power supply system, the rectification circuit adopts LCL type high-frequency rectification to convert alternating-current voltage after the voltage of the main power transformer is reduced into input direct-current voltage of the energy storage device, and provides proper charging current for the energy storage device, so that the functions of stabilizing current and limiting voltage are achieved.
3. According to the circulating pulse high-power degaussing main power supply system, the battery energy storage device is connected into the main power supply system, and the energy storage device can realize peak clipping and valley filling of electric power and improve the contradiction between power supply and demand. Therefore, the requirement of the power system on the capacity of the power grid can be reduced by adding the battery energy storage device into the power system, the impact on the power grid is avoided, and the power supply quality is improved. Meanwhile, the storage device system has bidirectional power regulation capability, and the energy storage element is used for flexibly storing and releasing electric energy, so that real-time power balance in the system can be ensured, the frequency characteristic is improved, and the problem of voltage fluctuation is solved. The energy storage device adopts a high-safety high-multiplying-power lithium iron phosphate battery pack, is improved in charging and discharging efficiency, safety performance and service life, is high in energy density and long in energy storage time, and is mainly used for storing and releasing energy required by load work.
4. According to the circulating pulse high-power degaussing main power supply system, the DC/DC voltage increasing and reducing device adopts a triple double-pipe Buck-Boost voltage increasing and reducing circuit. The double-tube Buck-Boost voltage-boosting circuit not only has the function of voltage boosting and reducing, but also has the advantages of low voltage stress of a power device, few passive elements, same input and output polarities and the like, and is suitable for occasions with wider input voltage change range.
5. According to the circulating pulse high-power degaussing main power supply system, the chopping commutation unit adopts an H-bridge topological structure consisting of 4 thyristors, and the thyristors are conducted in sequence according to control signals to complete the conversion of the positive direction and the negative direction of pulse working current.
6. According to the circulating pulse high-power demagnetization main power supply system, the energy leakage device in the main power supply system adopts the multi-stage resistor branches which are connected in parallel, and the resistance value of the loop resistor is gradually increased in the working stage, so that the rapid release of load current can be ensured, and the circuit components in the energy leakage loop are prevented from being damaged by overhigh terminal voltage at two ends of the inductor.
Drawings
FIG. 1 is a block diagram of the main power system topology of the preferred embodiment of the present invention;
FIG. 2 is a diagram of a three-phase rectifier topology according to a preferred embodiment of the present invention;
FIG. 3 is a control block diagram of a three-phase rectifier in accordance with a preferred embodiment of the present invention;
FIG. 4 is a block diagram of a topology of a DC/DC buck-boost converter in accordance with a preferred embodiment of the present invention;
fig. 5 is a control block diagram of a DC/DC buck-boost converter according to a preferred embodiment of the present invention;
FIG. 6 is a topology diagram of a power dissipation device in accordance with a preferred embodiment of the present invention;
FIG. 7 is a block diagram of a chopper commutation cell topology according to a preferred embodiment of the present invention;
the specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a block diagram of a topology of a main power supply system in an embodiment of the present invention. The power supply system mainly comprises subsystems such as a three-phase rectifier, a battery energy storage unit, a DC/DC buck-boost converter, an energy discharging device and a chopper unit. The AC mains supply is stepped down by the transformer and converted into the input voltage grade required by the three-phase converter. The three-phase rectifier is responsible for charging the battery energy storage device and supplying power to the large inductance load at the pulse current rising stage. The DC/DC buck-boost converter converts voltage, and the output direct current of the DC/DC buck-boost converter is commutated by the chopper commutator to provide positive and negative alternate pulse current for a large inductance load. The energy leakage device can shorten the pulse current descending time, so that the pulse descending time meets the design requirements of practical engineering. In which the inductive load is replaced by an equivalent RL series branch.
As shown in fig. 2, a topological block diagram of the three-phase rectifier of the main power supply system is provided. Wherein L is 1 Is a rectifier side inductor, C f Is a filter capacitor, L 2 Are network side inductors, which constitute the LCL filter. Compared with the L filter, the LCL filter comprises a filter capacitor C f The bypass path is provided for high-frequency harmonic current, and on the premise of realizing the same filtering effect, the sum of two inductance values in the LCL filter is smaller than the inductance value of a single inductance value in the L filter, so that the size is smaller and the cost is lower.
FIG. 3 is a control block diagram of a three-phase rectifier (where u is gα 、u gβ Alpha and beta axis grid voltages, u, respectively dc Is a DC bus voltage i 2α 、i 2β Is input current of alpha and beta axes of the rectifier) and the control target is to control the side current i of the converter 2 Make the rest of the network voltage U g And (6) synchronizing. U shape g The phase is obtained by a phase locked loop. General control can be divided into passive damping and active damping, butThe passive damping can bring extra power loss to the system while realizing the control target of the system, so that the controller adopts capacitance current active damping feedback control. And the suppression of the resonance peak of the LCL filter is realized through the capacitance current. According to the controller in the figure, the physical quantity under the abc coordinate system is converted into the alpha-beta coordinate system for control, and active power and reactive power are decoupled mutually. By controlling the side current of the AC network, capacitive current feedback, H, is introduced i1 And finally, outputting a PWM control signal to control the on-off of a three-phase rectifier bridge switching tube for a feedback coefficient.
As shown in fig. 4, a topology diagram (D in the figure) of a DC/DC buck-boost converter of the main power supply system is provided 11 -D 13 、D 21 -D 23 Representing diodes at different locations; s. the 11 -S 13 、S 21 -S 23 Indicating switching tubes at different positions; vin represents the input terminal voltage, V. Representing the output terminal voltage, C. Representing the output capacitance, i L1 、i L2 、i L3 Both representing inductor current). The DC/DC Buck-Boost converter adopts a triple double-tube Buck-Boost topological structure, performs Boost/Buck conversion on the output voltage of the energy storage device, and drives a load inductor. When the pulse load current is in the rising and stable stage, the double-tube Buck-Boost circuit works, and when the pulse current is in the falling and intermittent stage, the circuit device is turned off.
Fig. 5 shows a control strategy structure of the DC/DC buck-boost converter. The DC/DC Buck-Boost converter adopts a double-tube same-switch control strategy and works in a Buck-Boost mode. I is L Calculating a current inner loop under the current given current condition; given value of current I o_ref And the converter output current i o And a part of the correction to the given value of the current inner ring after passing through the PI controller obtains a converter duty ratio signal through the current inner ring controller and the three-phase current-sharing controller. i.e. i Lave Is the average current in a single switching cycle, where I L Can be calculated from the following formula.
In addition, in order to avoid voltage jump between two ends of the load inductor and cause oscillation of the output capacitor and the load inductor, the given waveform of the inductor current is designed into a piecewise function with continuous first-order derivatives. Linear setting is adopted in the initial stage of rising, the voltage of a direct current bus is fully utilized, and the rated current can be guaranteed to be achieved within 1 s. When the load is close to the rated current, the load is switched into a trigonometric function to ensure that the voltages at two ends of the load inductor are continuous, and the numerical expression of the function is
In addition, during the discharge phase of the operating coil, S 21 ～S 23 And opening the switch to provide a follow current path for the inductor current.
As shown in fig. 6, a topology of the discharging device of the main power supply system is provided. In the circuit of the energy discharge device, S m A full-control device is adopted for a main circuit switching tube of the energy leakage device. By controlling S m To realize the connection or disconnection of the energy leakage device in the power supply system; d m Is a freewheeling diode, when the energy-discharging device absorbs the load energy, the inductive current passes through the resistor and D m Afterflow; the energy release device comprises four resistance branches and an energy consumption resistor R 1 、R 2 、R 3 、R 4 Connected in parallel, wherein the energy-consuming resistor R 1 、R 2 、R 3 Respectively in fully-controlled switching devices S 1 、S 2 、S 3 Are connected in series. By controlling S 1 、S 2 、S 3 The on/off of the energy leakage device is used for adjusting the total resistance of the circuit of the energy leakage device.
The front stage of the energy release device is connected with the DC/DC buck-boost converter, and the rear stage is connected with the DC/DC buck-boost converterThe stage is connected with a large inductance load through a chopping commutation unit. When the pulse current rises and maintains a fixed amplitude for a period of time, the main circuit switch tube S of the energy discharging device m The energy leakage device is always in a conducting state and is in a standby state; when the pulse current is in a descending stage, a switching tube in the energy discharging device acts, and the device enters a working state. Meanwhile, in order to meet the reduction rate that the current is reduced to 0 in a short time, the inductance energy leakage is realized in a resistor segmented switching mode.
When the inductive current drops to 0, the switch tube S in the energy discharging device 1 、S 2 、S 3 All are turned off, the main circuit switch tube S m And the load inductor is in a conducting state again, the energy leakage of the load inductor is completed, and the energy leakage device is in a standby state.
Fig. 7 shows a circuit topology structure diagram of the chopper commutation unit. The structure mainly adopts an H-bridge structure consisting of 4 thyristors, and the H-bridge structure outputs a pulse type current waveform with positive and negative alternation and regular amplitude attenuation. When the first thyristor VT1 and the fourth thyristor VT4 are switched on, positive pulse current is output; when the second thyristor VT2 and the third thyristor VT3 are conducted, negative pulse current is output.
The foregoing shows and describes the general principles and features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the structural relationship and principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A cyclic pulse high-power degaussing main power supply system is characterized by comprising a transformer, a three-phase rectifier, a battery energy storage unit, a DC/DC buck-boost converter and a chopping commutation unit; the input end of the three-phase rectifier is connected with the commercial power, and the output end of the three-phase rectifier is connected with the input end of the battery energy storage unit; the output end of the battery energy storage unit is connected with the input end of the DC/DC buck-boost converter, the output end of the DC/DC buck-boost converter is connected with the input end of the chopping commutation unit, the output end of the chopping commutation unit is connected with the input end of the large-inductance load, and an energy leakage device is arranged between the DC/DC buck-boost converter and the chopping commutation unit;
a transformer: the three-phase rectifier circuit is used for converting commercial power into voltage levels required by the three-phase rectifier circuit;
three-phase rectifier: the active damping feedback control of the capacitance current is adopted and used for converting three-phase alternating current after voltage reduction of the transformer into direct current, the direct current and the battery energy storage device supply power to a large-inductance load at the rising stage of the pulse current, and the direct current supplies power to a battery energy storage device at the later stage during the pulse gap period of the pulse current, so that the battery energy storage device stores energy and prepares for supplying power to the load when the next pulse current rises;
a battery energy storage device: the required working current is provided for the load, and the working requirement of the load is met; when the instantaneous power required by the load supplied by the main power supply system reaches megawatt level, the power level required by the load cannot be met only by supplying power to the load by the three-phase rectification circuit, so that higher requirements can be provided for the power level of the main power supply system and the capacity of a power supply, and impact and harmonic pollution can be brought to a power grid. The battery energy storage device is connected to the direct current side of the three-phase rectifier of the main power supply system, so that the working current requirement required by a load is met, the requirement on the capacity of a power grid is reduced, the working current requirement required by the load is met, and the power grid is prevented from being impacted; when the pulse working current is in a rising or stable stage, the three-phase rectifier and the battery energy storage device jointly supply power to the inductive load; when the pulse working current is in a descending stage, the battery energy storage device is charged through the three-phase rectifier, the state of charge of the energy storage device is maintained within a certain range, and preparation is made for the next pulse current to ascend.
DC/DC buck-boost converter: the method comprises the following steps that a triple double-tube Buck-Boost topological structure and a double-tube simultaneous-on and simultaneous-off control strategy are adopted, boosting or reducing voltage is carried out on input direct-current voltage, and a voltage grade required by a load is output;
a chopping and reversing unit: the alternating current source is used for carrying out positive and negative commutation on the input current and providing positive and negative alternating current for a load;
the energy leakage device comprises: the device is used for realizing the rapid absorption of the energy of the large-inductance load in a mode of segmented switching of the resistor in the pulse current reduction stage; when the energy leakage device is connected to a power supply system, load current and the load form a follow current loop through the energy leakage device and the chopping commutation unit, the energy stored in the inductive load is absorbed by the energy leakage device, and the inductive current is reduced.
The main power supply system receives alternating current energy of an alternating current power grid, and provides intermittent pulse current with alternating positive and negative and changing attenuation according to a rule for a large inductance load after links such as voltage reduction, rectification, energy storage, conversion and reversing, and the main power supply system has the characteristics of high power density and high energy density. The amplitude and duration of the main power supply output current may be adjusted and controlled by a controller or the like of the main power supply system.
2. The system of claim 1 wherein the three-phase rectifier includes a rectifier side inductor L 1 Filter capacitor C f And network side inductance L 2 Rectifier side inductance L 1 Filter capacitor C f And network side inductance L 2 together with Constituting an LCL filter.
3. The main power system for cyclic pulse high power degaussing according to claim 1, wherein the method for the three-phase rectifier using the active damping feedback control of the capacitor current comprises: the suppression of the resonance peak of the LCL filter is realized through the capacitance current; physical quantities in an abc coordinate system are converted into an alpha beta coordinate system to be controlled, so that active and reactive decoupling is realized; and the current at the side of the alternating current network is controlled, the feedback of the capacitance current is introduced, and finally, a PWM control signal is output to control the on-off of a three-phase rectifier bridge switching tube.
4. The cyclic pulse high-power degaussing main power supply system according to claim 1, wherein the DC/DC Buck-Boost converter adopts a triple double-tube Buck-Boost topological structure, and performs Boost/Buck conversion on the output voltage of an energy storage device to drive a load inductor; when the pulse working current is in a rising stage, the Buck-Boost circuit works in the modes of Buck and Buck-Boost; when the pulse working current is in a steady-state stage, the Boost-Buck circuit works in a Buck-Boost mode and a Buck mode; when the pulse load current is in the rising and stable stage, the double-tube Buck-Boost circuit works, and when the pulse current is in the falling and intermittent stage, the circuit device is turned off.
5. The cyclic pulse high power degaussing main power supply system according to claim 1, wherein the two-transistor on-off control strategy is: working in a Buck-Boost mode; i is L Calculating a current inner loop under the current given current condition; given value of current I o_ref And the converter output current i o A correction part of the given value of the current inner ring after passing through the PI controller obtains a converter duty ratio signal through the current inner ring controller and the three-phase current-sharing controller; i.e. i Lave Is the average current in a single switching cycle, where I L Can be calculated from the following formula:
in the formula I o_ref Is a given value of current, D is a duty ratio, M ref For a given modulation ratio, V in Inputting voltage for a double-tube Buck-Boost converter; r L The equivalent internal resistance L of the inductor is the inductor, and d is a differential sign;
in order to avoid voltage jump at two ends of a load inductor and cause oscillation of an output capacitor and the load inductor, a given waveform of an inductive current is designed into a piecewise function with continuous first-order derivatives; linear setting is adopted in the initial stage of rising, the voltage of a direct current bus is fully utilized, and the rated current can be ensured to be achieved within 1 s; when the load is close to the rated current, the load is switched to a trigonometric function, the voltage at two ends of the load inductor is ensured to be continuous, and the numerical expression of the function is as follows:
x is a dimensionless quantity characterizing the current; y is a dimensionless quantity characterizing the voltage.
6. The main power supply system for cyclic pulse high-power degaussing according to claim 1, wherein the energy discharge device comprises a capacitor energy discharge circuit, the capacitor energy discharge circuit comprises 4 resistor segmented switching branch circuits, 1 resistor branch circuit and a freewheeling diode Dm; the resistor subsection switching branch circuit and the resistor branch circuit form a plurality of paths and are connected in parallel and then are connected in series with the fly-wheel diode Dm, the circuit after series connection is connected on a main circuit between the external DC/DC buck-boost converter and the chopping commutation unit, and a main circuit switching tube Sm is further arranged on the main circuit close to the fly-wheel diode Dm; each resistor subsection switching branch circuit is provided with a resistor element and a branch switching tube element in series; a resistance element is arranged on the resistance branch circuit; and a switching tube element on the resistor subsection switching branch circuit is connected with the anode end of the fly-wheel diode Dm.
7. The system according to claim 6, wherein S is the power supply system for degaussing in high power m A fully-controlled device is adopted for a main circuit switch tube of the energy discharge device; by controlling S m To realize the connection or disconnection of the energy leakage device in the power supply system; d m Is a freewheeling diode, when the energy-discharging device absorbs the load energy, the inductive current passes through the resistor and D m Afterflow; the energy release device comprises four resistance branches and an energy consumption resistor R 1 、R 2 、R 3 、R 4 Connected in parallel, wherein the energy-consuming resistor R 1 、R 2 、R 3 Respectively at allControl type switch device S 1 、S 2 、S 3 Are connected in series; by controlling S 1 、S 2 、S 3 The total resistance of the energy leakage device circuit is adjusted by switching on and off;
the front stage of the energy discharging device is connected with the DC/DC buck-boost converter, and the rear stage of the energy discharging device is connected with a large inductance load through a chopping commutation unit; when the pulse current rises and maintains a fixed amplitude for a period of time, the main circuit switch tube S of the energy discharging device m The energy leakage device is always in a conducting state and is in a standby state; when the pulse current is in a descending stage, a switching tube in the energy discharging device acts, and the device enters a working state; meanwhile, in order to meet the reduction rate that the current is reduced to 0 in a short time, the inductance energy leakage is realized in a resistor segmented switching mode; the energy-saving circuit can rapidly absorb all energy of a large inductive load in a short time and ensure the safe operation of a switching device in an energy-leakage loop.
When the inductive current drops to 0, the switch tube S in the energy discharging device 1 、S 2 、S 3 All are turned off, the main circuit switch tube S m And the load inductor is in a conducting state again, the energy leakage of the load inductor is completed, and the energy leakage device is in a standby state.
8. The main power supply system for cyclic pulse high-power degaussing according to claim 1, wherein the chopper commutation unit comprises an H-bridge structure formed by 4 thyristors, and outputs a pulse type current waveform with alternating positive and negative and regular amplitude attenuation; when the first thyristor VT1 and the fourth thyristor VT4 are switched on, forward pulse current is output; when the second thyristor VT2 and the third thyristor VT3 are conducted, negative pulse current is output.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865589A (en) * | 2023-05-18 | 2023-10-10 | 柔脉医疗(深圳)有限公司 | Portable electric conversion equipment and method based on inductance boost circuit |
| CN117937922A (en) * | 2023-12-21 | 2024-04-26 | 北京交通大学 | Buck-boost bidirectional converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935067A (en) * | 2015-07-06 | 2015-09-23 | 诸暨市沃思环保技术有限公司 | Environmental monitoring station power supply system |
| WO2016015329A1 (en) * | 2014-08-01 | 2016-02-04 | 冷再兴 | Dc-ac bi-directional power converter topology |
| WO2020157053A1 (en) * | 2019-02-01 | 2020-08-06 | ETH Zürich | Method for closed-loop control of a three-phase pulse rectifier system with current intermediate circuit |
| CN114499141A (en) * | 2022-01-28 | 2022-05-13 | 中国人民解放军海军工程大学 | Energy leakage device, energy leakage power supply system and energy leakage method adopting resistor segmented switching mode |
| CN114499139A (en) * | 2022-01-25 | 2022-05-13 | 中国人民解放军海军工程大学 | Energy discharge device, energy discharge power supply system and energy discharge method adopting capacitance resonance mode |
-
2022
- 2022-06-07 CN CN202210638955.4A patent/CN115001294B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015329A1 (en) * | 2014-08-01 | 2016-02-04 | 冷再兴 | Dc-ac bi-directional power converter topology |
| CN104935067A (en) * | 2015-07-06 | 2015-09-23 | 诸暨市沃思环保技术有限公司 | Environmental monitoring station power supply system |
| WO2020157053A1 (en) * | 2019-02-01 | 2020-08-06 | ETH Zürich | Method for closed-loop control of a three-phase pulse rectifier system with current intermediate circuit |
| CN114499139A (en) * | 2022-01-25 | 2022-05-13 | 中国人民解放军海军工程大学 | Energy discharge device, energy discharge power supply system and energy discharge method adopting capacitance resonance mode |
| CN114499141A (en) * | 2022-01-28 | 2022-05-13 | 中国人民解放军海军工程大学 | Energy leakage device, energy leakage power supply system and energy leakage method adopting resistor segmented switching mode |
Non-Patent Citations (1)
| Title |
|---|
| 洪峰;孙刚;蔡兆奇;王慧贞;严仰光;: "双Buck双向交流斩波器", 中国电机工程学报, no. 18, 25 June 2008 (2008-06-25) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865589A (en) * | 2023-05-18 | 2023-10-10 | 柔脉医疗(深圳)有限公司 | Portable electric conversion equipment and method based on inductance boost circuit |
| CN117937922A (en) * | 2023-12-21 | 2024-04-26 | 北京交通大学 | Buck-boost bidirectional converter |
| CN117937922B (en) * | 2023-12-21 | 2024-10-01 | 北京交通大学 | Buck-boost bidirectional converter |
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