CN111817366B - Medium-voltage direct-current input double-output three-level phase-shift full-bridge charging device and online charging control method - Google Patents

Medium-voltage direct-current input double-output three-level phase-shift full-bridge charging device and online charging control method Download PDF

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CN111817366B
CN111817366B CN202010496955.6A CN202010496955A CN111817366B CN 111817366 B CN111817366 B CN 111817366B CN 202010496955 A CN202010496955 A CN 202010496955A CN 111817366 B CN111817366 B CN 111817366B
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branch
input
medium
diode
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CN111817366A (en
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杨国润
范学鑫
肖飞
常永昊
王路
王瑞田
李广波
王玉杰
朱俊杰
聂子玲
许金
王海超
张新生
熊又星
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Naval University of Engineering PLA
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Naval University of Engineering PLA
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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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs

Abstract

The invention discloses a medium-voltage direct-current input double-output three-level phase-shifting full-bridge charging device which comprises an input loop, a three-level inverter assembly, a three-winding intermediate-frequency transformer, a rectifier assembly and an output loop, wherein the input loop obtains electricity from a medium-voltage direct-current power grid and transmits the electricity to the three-level inverter assembly, the three-level inverter assembly converts direct current into intermediate-frequency alternating current and transmits the intermediate-frequency alternating current to the three-winding intermediate-frequency transformer, the intermediate-frequency alternating current is subjected to voltage reduction by the three-winding intermediate-frequency transformer and then is transmitted to the rectifier assembly in two ways, the rectifier assembly converts the two ways of intermediate-frequency alternating current into two ways of direct current and transmits the two ways of direct current to the output loop, and the output loop charges two ways of super capacitors after filtering the two ways of direct current. By adopting an isolated three-level topological structure based on a three-winding medium-frequency transformer, multiple requirements of medium-voltage direct-current input, double output, input and output electrical isolation, simple structure, high power density, high reliability and the like are met, and the problem of rapid online charging of a super capacitor in an electromagnetic emission process is solved.

Description

Medium-voltage direct-current input double-output three-level phase-shift full-bridge charging device and online charging control method
Technical Field
The invention belongs to the technical field of power electronic electric energy conversion devices, and particularly relates to a medium-voltage direct-current input double-output three-level phase-shift full-bridge charging device and an online charging control method.
Background
With the continuous progress of the technical level in recent years, electromagnetic emission gradually goes to engineering practice from a completely new concept of emission mode, and the electromagnetic emission has huge potential advantages and wide application prospects in the fields of military and civil use. The electromagnetic emission process needs extremely large instantaneous power, and the capacity of a power grid cannot meet the requirement, so an energy storage system must be configured in the electromagnetic emission device to reduce the instantaneous power requirement of high-power continuous emission on the power grid.
The super capacitor energy storage has the advantages of high power density, short energy storage period, long cycle life, wide use temperature range and the like, and is very suitable for electromagnetic emission and other application occasions requiring high power density and rapid energy storage/release. When the super capacitor is used for storing energy, a charging device is required to be configured in the energy storage system, and the charging device has the main function of charging the super capacitor and supplementing the electric energy consumed in the transmitting process. The current converter topology suitable for charging the super capacitor is divided into a non-isolated topology and an isolated topology, and the non-isolated topology has small power level and low safety; the two-level structure in the isolation topology has low voltage level, and the series-parallel combination and the modular multilevel structure based on the two-level structure are too complex. Electromagnetic emission usually stores energy with relatively small power before emission, and a charging device stops in the emission process, however, in the application occasion of rapid and continuous emission, the charging device needs to charge a super capacitor on line in the emission process so as to rapidly supplement electric energy consumed in the emission process and meet the requirement of next emission.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a medium-voltage direct-current input double-output three-level phase-shift full-bridge charging device and an online charging control method which simultaneously meet the requirements of medium-voltage direct-current input, single-input double-output and input-output electrical isolation.
In order to achieve the purpose, the medium-voltage direct-current input double-output three-level phase-shifting full-bridge charging device comprises an input loop, a three-level inverter assembly, a three-winding intermediate frequency transformer, a rectifier assembly and an output loop, wherein the input loop obtains electricity from a medium-voltage direct-current power grid and transmits the electricity to the three-level inverter assembly, the three-level inverter assembly converts direct current into intermediate-frequency alternating current and transmits the intermediate-frequency alternating current to the three-winding intermediate frequency transformer, the intermediate-frequency alternating current is subjected to voltage reduction by the three-winding intermediate frequency transformer and then is transmitted to the rectifier assembly in two ways, the rectifier assembly converts the two ways of intermediate-frequency alternating current into two ways of direct current and transmits the two ways of direct current to the output loop, and the output loop charges two ways of supercapacitors after filtering the two ways of direct current.
The three-level inverter is characterized by further comprising a control system, wherein the control system is in bidirectional communication with the input circuit, the three-level inverter assembly, the three-winding intermediate frequency transformer, the rectifying assembly and the output circuit respectively.
Furthermore, the closed circulating cooling water circuit is used for taking away heat generated in the operation process of the input circuit, the three-level inverter assembly, the three-winding intermediate frequency transformer, the rectifying assembly and the output circuit.
Further, the input circuit 1 includes an input fuse F1, an input fuse F2, an input contactor K1, an input smoothing reactor L1, an input smoothing reactor L2, an input diode D1, a support capacitor C1, a support capacitor C2, a voltage equalizing resistor Rj1, a voltage equalizing resistor Rj2, and a charging and discharging component composed of a charging switch Kc1, a charging resistor Rc1, a charging reactor Lc1, a charging switch Kc2, a charging resistor Rc2, a charging reactor Lc2, a discharging switch Kd, and a discharging resistor Rd; and the input contactor K1 is a mechanical holding type, and the contact is not opened when the power failure is controlled.
Further, the three-level inverter component comprises an IGBT-T1, an IGBT-T2, an IGBT-T3, an IGBT-T4, an IGBT-T5, an IGBT-T6, an IGBT-T7, an IGBT-T8, a clamping diode Dc1, a clamping diode Dc2, a clamping diode Dc3, a clamping diode Dc4, an inner tube protection resistor Rj3, an inner tube protection resistor Rj4, an absorption capacitor Cs1 and an absorption capacitor Cs 2.
Further, the three-winding intermediate frequency transformer comprises 1 primary winding and 2 secondary windings; the rectifying assembly comprises a rectifying diode Dr1, a rectifying diode Dr2, a rectifying diode Dr3, a rectifying diode Dr4 and a resistance-capacitance absorption circuit.
Further, the output loop comprises an output filter reactor L3, an output filter reactor L4, an output diode D2, an output fuse F3 and an output fuse F4.
Furthermore, the control system comprises a top layer controller and a bottom layer controller, wherein the top layer controller and the bottom layer controller are connected through a CAN bus and a hard wire; the top layer controller is used for providing a man-machine interaction control interface, receiving a superior system control instruction, sending a control instruction to the charging and discharging assembly and the input contactor K1, and sending a control instruction to the bottom layer controller; and the bottom layer controller is used for collecting voltage and current data to complete closed-loop operation according to the received control instruction, and realizing on-off control of the IGBT in the three-level inverter assembly.
Further, the closed circulating cooling water path comprises a main water inlet pipe, a main water drainage pipe, an input diode D1 branch, a three-level inverter component water cooling plate, a three-winding intermediate frequency transformer branch, a rectifier component water cooling plate, a rectifier component branch, an output filter reactor branch, an output diode D2 branch, an output diode D2 water cooling plate and a water-air heat exchanger branch, wherein a water inlet of the input diode D1 branch, a water inlet of the three-level inverter component branch, a water inlet of the rectifier component branch, a water inlet of the output filter reactor branch, a water inlet of the output diode D2 branch, a water inlet of the three-winding intermediate frequency transformer branch and a water-air heat exchanger branch are all connected with the main water inlet pipe, a water outlet of the input diode D1 branch, a water outlet of the three-level inverter component branch, a water outlet of the rectifier component branch, The water outlet of the output filter reactor branch, the water outlet of the output diode D2 branch, the water outlet of the three-winding intermediate frequency transformer branch and the water outlet of the water-air heat exchanger branch are all connected with the main drainage pipe, the three-level inverter assembly water cooling plate is connected with the three-level inverter assembly branch, the rectifier assembly water cooling plate is connected with the rectifier assembly branch, and the output diode D2 water cooling plate is connected with the output diode D2 branch.
The maximum value of two paths of output currents is used as feedback current to participate in PI operation to obtain a left bridge arm phase shift angle and a right bridge arm phase shift angle of a three-level inversion assembly, the charging device keeps constant current output by adjusting the phase shift angle, and the maximum value of two paths of output voltages is used for participating in hysteresis loop judgment to prevent overvoltage of a super capacitor; when the voltage of the super capacitor is smaller than a threshold value 1, enabling the PI regulator, and outputting two paths of constant current to charge the super capacitor by the charging device; and when the voltage of the super capacitor is greater than or equal to a threshold value 2, the PI regulator is forbidden, and the charging device stops charging, wherein the threshold value 2 is greater than a threshold value 1.
Compared with the prior art, the invention has the following advantages:
1) an isolated three-level topological structure based on a three-winding medium-frequency transformer is adopted, multiple requirements of medium-voltage direct-current input, double output, input and output electrical isolation, simple structure, high power density, high reliability and the like are met, and the problem of rapid online charging of a super capacitor in an electromagnetic emission process is solved;
2) because the direct current output adopts the reactor for filtering, the charging current ripple is small, the temperature fluctuation of the super capacitor is reduced, and the service life of the super capacitor is prolonged;
3) the input circuit adopts the contactor and the fuse, provides a new idea of short-circuit protection, and simultaneously improves the flexibility and the reliability of the parallel operation of the input side.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Fig. 3 is a structural view of the closed-cycle cooling water circuit of the present invention.
FIG. 4 is a schematic diagram of the control system of the present invention.
Fig. 5 is a control block diagram of the online charging control method according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the medium-voltage direct-current input dual-output three-level phase-shift full-bridge charging device includes an input loop 1, a three-level inverter component 2, a three-winding intermediate frequency transformer 3, a rectifier component 4, an output loop 5, a closed circulation cooling water circuit 6 and a control system 7, wherein the relationship among the seven components is mainly divided into an energy flow, an information flow and a cooling water flow, and the energy flow direction is as follows: when the super capacitor is charged each time, the input loop 1 gets electricity from a medium-voltage direct-current power grid and transmits the electricity to the three-level inversion assembly 2, the three-level inversion assembly 2 converts direct current into medium-frequency alternating current and transmits the medium-frequency alternating current to the three-winding medium-frequency transformer 3, the medium-frequency alternating current is subjected to voltage reduction by the three-winding medium-frequency transformer 3 and then is transmitted to the rectification assembly 4 in two ways, the rectification assembly 4 converts the two ways of medium-frequency alternating current into two ways of direct current and transmits the two ways of direct current to the output loop 5, and the output loop 5 filters the two ways of direct current and then charges the two ways of super capacitor; the information flow direction is: the control system 7 collects state data of the input loop 1, the three-level inversion component 2, the three-winding intermediate frequency transformer 3, the rectification component 4 and the output loop 5, sends different control instructions to the input loop 1 and the three-level inversion component 2, controls each part of the energy flow to be executed according to a preset program, and can diagnose each part of the energy flow and the health state of the energy flow in real time; the cooling water flow is as follows: the deionized water is divided into a plurality of branches flowing to each part of the energy flow after flowing into the main water inlet pipe, and then flows out after converging in the main water outlet pipe. The functions of each part are as follows:
the input loop 1 is used for getting electricity from a medium-voltage direct-current power grid, filtering the electricity by a support capacitor and then transmitting the electricity to the three-level inverter assembly 2; the input contactor is adopted, so that a plurality of inputs can run in parallel conveniently; and a fuse and an input diode are adopted to realize short-circuit protection. And the three-level inversion component 2 is used for converting the input direct current into intermediate frequency alternating current and outputting the intermediate frequency alternating current to the three-winding intermediate frequency transformer. And the three-winding medium-frequency transformer 3 is used for reducing the medium-frequency alternating current and then transmitting the reduced medium-frequency alternating current to the rectifying component 4 in two paths. And the rectifying component 4 is used for converting the two paths of intermediate frequency alternating current into two paths of direct current and transmitting the two paths of direct current to the output loop 5. And the output loop 5 is used for charging the two paths of direct currents to the two paths of super capacitors after the two paths of direct currents are filtered by the output reactor. And the closed circulating cooling water path 6 is used for taking away heat generated in the operation process of the input loop 1, the three-level inverter component 2, the three-winding intermediate frequency transformer 3, the rectifying component 4 and the output loop 5.
And the control system 7 is used for acquiring state data of the input loop 1, the three-level inverter component 2, the three-winding intermediate frequency transformer 3, the rectifier component 4 and the output loop 5, sending different control instructions to the input loop 1 and the three-level inverter component 2, controlling the charging device to execute according to a preset program and charging the super capacitor. The control system 7 provides a human-computer interface for an operator and a system device, receives a control command of a superior system, and uploads state data to the superior system.
As shown in fig. 2, the input circuit 1 includes an input fuse F1, an input fuse F2, an input contactor K1, an input smoothing reactor L1, an input smoothing reactor L2, an input diode D1, a support capacitor C1, a support capacitor C2, a voltage equalizing resistor Rj1, a voltage equalizing resistor Rj2, and a charge/discharge module including a charge switch Kc1, a charge resistor Rc1, a charge reactor Lc1, a charge switch Kc2, a charge resistor Rc2, a charge reactor Lc2, a discharge switch Kd, and a discharge resistor Rd. The three-level inverter component 2 comprises an IGBT-T1, an IGBT-T2, an IGBT-T3, an IGBT-T4, an IGBT-T5, an IGBT-T6, an IGBT-T7, an IGBT-T8, a clamp diode Dc1, a clamp diode Dc2, a clamp diode Dc3, a clamp diode Dc4, an inner tube protection resistor Rj3, an inner tube protection resistor Rj4, an absorption capacitor Cs1 and an absorption capacitor Cs 2. The three-winding intermediate frequency transformer 3 comprises 1 primary winding and 2 secondary windings. The rectifying component 4 includes a rectifying diode Dr1, a rectifying diode Dr2, a rectifying diode Dr3, a rectifying diode Dr4, and a resistance-capacitance absorption circuit. The output circuit 5 includes an output filter reactor L3, an output filter reactor L4, an output diode D2, an output fuse F3, and an output fuse F4.
As shown in fig. 3, the closed circulation cooling water path 6 includes a main water inlet pipe 8, a main water discharge pipe 9, an input diode D1 branch 10, a three-level inverter assembly branch 19, a three-level inverter assembly water cooling plate 15, a three-winding intermediate frequency transformer branch 16, a rectifier assembly water cooling plate 14, a rectifier assembly branch 18, an output filter reactor branch 13, an output diode D2 branch 17, an output diode D2 water cooling plate 12 and a water-air heat exchanger branch 13, a water inlet of the input diode D1 branch 10, a water inlet of the three-level inverter assembly branch 19, a water inlet of the rectifier assembly branch 18, a water inlet of the output filter reactor branch 13, a water inlet of the output diode D2 branch 17, a water inlet of the three-winding intermediate frequency transformer branch 16 and a water inlet of the water-air heat exchanger branch 13 are all connected to the main water inlet pipe 8, a water outlet of the input diode D1 branch 10 and a water outlet of the three-level inverter assembly branch 19, The water outlet of the rectifying component branch 18, the water outlet of the output filter reactor branch 13, the water outlet of the output diode D2 branch 17, the water outlet of the three-winding intermediate frequency transformer branch 16 and the water outlet of the water-air heat exchanger branch 13 are all connected with the main drainage pipe 9, the three-level inverter component water cooling plate 15 is connected with the three-level inverter component branch 19, the rectifying component water cooling plate 14 is connected with the rectifying component branch 18, and the output diode D2 water cooling plate 12 is connected with the output diode D2 branch 17.
As shown in fig. 4, the control system 7 includes a top controller and a bottom controller, and the top controller and the bottom controller are connected through a CAN bus and a hard wire. The top layer controller adopts a hardware scheme of PLC plus HMI, and the bottom layer controller adopts a hardware scheme of DSP plus FPGA.
The top layer controller is used for providing a man-machine interaction control interface, receiving a superior system control instruction, sending a control instruction to the charging and discharging assembly and the input contactor K1, sending a control instruction to the bottom layer controller, realizing receiving, processing and sending various instructions, controlling the charging device to complete operation according to a preset flow, having an interlocking function and preventing misoperation. The bottom layer controller is used for collecting voltage and current data to complete closed-loop operation according to the received control instruction, so that the on-off control of the IGBT in the three-level inverter assembly is realized, and software and hardware protection is performed during fault.
As shown in fig. 5, in the online charging control method, the maximum value of two output currents is used as a feedback current to participate in PI operation to obtain the phase shift angles of the left and right bridge arms of the three-level inverter assembly 2, the charging device keeps constant-current output by adjusting the phase shift angles, and the maximum value of two output voltages is used to participate in hysteresis judgment to prevent overvoltage of the super capacitor. When the voltage of the super capacitor is smaller than a threshold value 1, enabling the PI regulator, and outputting two paths of constant current by the charging device to charge the super capacitor; and when the voltage of the super capacitor is greater than or equal to a threshold value 2, the PI regulator is forbidden, and the charging device stops charging, wherein the threshold value 2 is greater than a threshold value 1.

Claims (8)

1. The utility model provides a medium voltage direct current input dual output three-level phase-shift full-bridge charging device which characterized in that: the high-frequency-conversion-efficiency energy-saving power supply system comprises an input loop (1), a three-level inverter assembly (2), a three-winding intermediate frequency transformer (3), a rectifier assembly (4) and an output loop (5), wherein the input loop (1) obtains power from a medium-voltage direct current power grid and conveys the power to the three-level inverter assembly (2), the three-level inverter assembly (2) converts direct current into medium-frequency alternating current and conveys the medium-frequency alternating current to the three-winding intermediate frequency transformer (3), the medium-frequency alternating current is subjected to voltage reduction by the three-winding intermediate frequency transformer (3) and then is conveyed to the rectifier assembly (4) in two ways, the rectifier assembly (4) converts the two ways of medium-frequency alternating current into two ways of direct current and conveys the two ways of direct current to the output loop (5), and the output loop (5) charges two ways of super capacitors after filtering the two ways of direct current;
the input circuit (1) comprises an input fuse F1, an input fuse F2, an input contactor K1, an input smoothing reactor L1, an input smoothing reactor L2, an input diode D1, a supporting capacitor C1, a supporting capacitor C2, a voltage equalizing resistor Rj1, a voltage equalizing resistor Rj2 and a charging and discharging component consisting of a charging switch Kc1, a charging resistor Rc1, a charging reactor Lc1, a charging switch Kc2, a charging resistor Rc2, a charging reactor Lc2, a discharging switch Kd and a discharging resistor Rd; the input contactor K1 is of a mechanical holding type, and the contact is controlled not to be opened when power is off;
the online charging control method of the medium-voltage direct-current input double-output three-level phase-shifted full-bridge charging device comprises the steps of taking the maximum value of two paths of output currents as feedback currents to participate in PI operation to obtain the phase shift angles of left and right bridge arms of a three-level inversion assembly (2), enabling the charging device to keep constant-current output by adjusting the phase shift angles, and taking the maximum value of two paths of output voltages to participate in hysteresis loop judgment to prevent overvoltage of a super capacitor; when the voltage of the super capacitor is smaller than a threshold value 1, enabling the PI regulator, and outputting two paths of constant current to charge the super capacitor by the charging device; and when the voltage of the super capacitor is greater than or equal to a threshold value 2, the PI regulator is forbidden, and the charging device stops charging, wherein the threshold value 2 is greater than a threshold value 1.
2. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 1, wherein: the three-level inverter is characterized by further comprising a control system (7), wherein the control system (7) is in bidirectional communication with the input circuit (1), the three-level inverter component (2), the three-winding intermediate frequency transformer (3), the rectifying component (4) and the output circuit (5) respectively.
3. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 1, wherein: the three-level inverter is characterized by further comprising a closed circulating cooling water path (6) for taking away heat generated in the operation process of the input circuit (1), the three-level inverter component (2), the three-winding intermediate frequency transformer (3), the rectifier component (4) and the output circuit (5).
4. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 1, wherein: the three-level inverter component (2) comprises an IGBT-T1, an IGBT-T2, an IGBT-T3, an IGBT-T4, an IGBT-T5, an IGBT-T6, an IGBT-T7, an IGBT-T8, a clamping diode Dc1, a clamping diode Dc2, a clamping diode Dc3, a clamping diode Dc4, an inner tube protection resistor Rj3, an inner tube protection resistor Rj4, an absorption capacitor Cs1 and an absorption capacitor Cs 2.
5. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 1, wherein: the three-winding intermediate frequency transformer (3) comprises 1 primary winding and 2 secondary windings; the rectifying component (4) comprises a rectifying diode Dr1, a rectifying diode Dr2, a rectifying diode Dr3, a rectifying diode Dr4 and a resistance-capacitance absorption circuit.
6. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 1, wherein: the output loop (5) comprises an output filter reactor L3, an output filter reactor L4, an output diode D2, an output fuse F3 and an output fuse F4.
7. The medium voltage dc input dual-output three-level phase-shifted full-bridge charging device according to claim 2, wherein: the control system (7) comprises a top layer controller and a bottom layer controller, and the top layer controller and the bottom layer controller are connected through a CAN bus and a hard wire; the top layer controller is used for providing a man-machine interaction control interface, receiving a superior system control instruction, sending a control instruction to the charging and discharging assembly and the input contactor K1, and sending a control instruction to the bottom layer controller; and the bottom layer controller is used for collecting voltage and current data to complete closed-loop operation according to the received control instruction, and realizing on-off control of the IGBT in the three-level inverter assembly.
8. The medium-voltage direct-current input dual-output three-level phase-shifted full-bridge charging device according to claim 3, wherein: the closed circulating cooling water channel (6) comprises a main water inlet pipe (8), a main water drainage pipe (9), an input diode D1 branch (10), a three-level inverter component branch (19), a three-level inverter component water cooling plate (15), a three-winding intermediate frequency transformer branch (16), a rectifier component water cooling plate (14), a rectifier component branch (18), an output filter reactor branch (13), an output diode D2 branch (17), an output diode D2 water cooling plate (12) and a water-air heat exchanger branch (13), wherein a water inlet of the input diode D1 branch (10), a water inlet of the three-level inverter component branch (19), a water inlet of the rectifier component branch (18), a water inlet of the output filter reactor branch (13), a water inlet of the output diode D2 branch (17), a water inlet of the three-winding intermediate frequency transformer branch (16) and a water inlet of the water-air heat exchanger branch (13) are all connected with the main water inlet pipe (8), the water outlet of the input diode D1 branch (10), the water outlet of the three-level inverter component branch (19), the water outlet of the rectifier component branch (18), the water outlet of the output filter reactor branch (13), the water outlet of the output diode D2 branch (17), the water outlet of the three-winding intermediate frequency transformer branch (16) and the water outlet of the water-air heat exchanger branch (13) are all connected with a main drainage pipe (9), the three-level inverter component water cooling plate (15) is connected with the three-level inverter component branch (19), the rectifier component water cooling plate (14) is connected with the rectifier component branch (18), and the output diode D2 water cooling plate (12) is connected with the output diode D2 branch (17).
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