CN113507219A - Water-cooling high-power medium-high frequency power supply device - Google Patents

Water-cooling high-power medium-high frequency power supply device Download PDF

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Publication number
CN113507219A
CN113507219A CN202111029560.6A CN202111029560A CN113507219A CN 113507219 A CN113507219 A CN 113507219A CN 202111029560 A CN202111029560 A CN 202111029560A CN 113507219 A CN113507219 A CN 113507219A
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phase
terminal
contact
circuit
bridge arm
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CN202111029560.6A
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CN113507219B (en
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虞大力
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JIANGSU EASTONE TECHNOLOGY CO LTD
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JIANGSU EASTONE TECHNOLOGY CO LTD
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • 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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20927—Liquid coolant without phase change

Abstract

The invention discloses a water-cooling high-power medium-high frequency power supply device, which comprises: the input end of the three-phase rectification circuit is connected with a three-phase power grid; the three-phase rectification circuit is connected to the first alternating current interface through a first switch K1; the input end of the three-phase inverter circuit is connected with the direct-current bus of the output end of the three-phase rectification circuit, and the output end of the three-phase inverter circuit is connected to the second alternating-current interface through a second switch K2; the first storage battery pack E1 and the second storage battery pack E2 are connected in series between the direct current buses, and a first chopper circuit is connected in parallel at two ends of the second storage battery pack E2; a first terminal of the direct current interface is connected with the output end of the first chopper circuit, a second terminal of the direct current interface is connected with the negative electrode of the direct current bus, and a third terminal of the direct current interface is connected with the positive electrode of the direct current bus through a first controllable switch Q1; and the compensation loop is used for stabilizing the voltage at the input end of the three-phase rectification circuit and is connected between the output end of the three-phase inversion circuit and the input end of the three-phase rectification circuit. The invention solves the technical problem of unstable output power supply of the medium-high frequency power supply device.

Description

Water-cooling high-power medium-high frequency power supply device
Technical Field
The invention relates to the technical field of power distribution and energy storage, in particular to a water-cooling high-power medium-high frequency power supply device.
Background
The medium-high frequency power supply device is mainly used for energy-using equipment with high voltage stability requirements, for example, the power supply is used as a power supply of a single crystal furnace, the single crystal furnace has very high control requirements on a temperature field in the operation process, and once the temperature field deviates, defects exist in the monocrystalline silicon and the monocrystalline silicon is easily scrapped.
In the prior art, in the long growth process of monocrystalline silicon, if a phase failure occurs in a three-phase power grid, basically, a furnace product is scrapped, and great loss is caused.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide a water-cooled high-power medium-high frequency power supply apparatus, which stabilizes the dc bus voltage by the energy storage battery on the dc bus, thereby ensuring the output voltage to be stable. On the other hand, when the power grid has a phase failure, the power grid is supported to be stable through the energy storage battery, and the stable operation of the power supply device is ensured. The invention solves the technical problem of unstable output power supply of the medium-high frequency power supply device.
To achieve these objects and other advantages in accordance with the present invention, there is provided a water-cooled high-power medium-high frequency power supply apparatus, comprising:
the input end of the three-phase rectifying circuit is connected with a three-phase power grid; the three-phase rectification circuit is connected to the first alternating current interface through a first switch K1;
the input end of the three-phase inverter circuit is connected with the direct-current bus of the output end of the three-phase rectification circuit, and the output end of the three-phase inverter circuit is connected to the second alternating-current interface through a second switch K2;
the first storage battery pack E1 and the second storage battery pack E2 are connected in series between the direct current buses, and a first chopper circuit is connected in parallel at two ends of the second storage battery pack E2;
a first terminal of the direct current interface is connected with the output end of the first chopper circuit, a second terminal of the direct current interface is connected with the negative electrode of a direct current bus, and a third terminal of the direct current interface is connected with the positive electrode of the direct current bus through a first controllable switch Q1;
and the compensation loop is used for stabilizing the voltage at the input end of the three-phase rectification circuit and is connected between the output end of the three-phase inverter circuit and the input end of the three-phase rectification circuit.
Preferably, the first ac interface is connected to an isolation transformer, and an output terminal of the isolation transformer is connected to an ac load; the first end of the second alternating current interface is connected to the output end of the three-phase inverter circuit through the second switch K2, and the second end of the second alternating current interface is directly connected to an alternating current load.
Preferably, the first terminal and the second terminal are connected to a secondary dc load, and the third terminal and the second terminal are connected to a primary dc load.
Preferably, the first controllable switch Q1 is connected to a dc bus at the output end of the three-phase rectification circuit, a second controllable switch Q2 is connected in series to the positive pole of the dc bus between the first battery pack E1 and the first controllable switch Q1, and a second chopper circuit is arranged on the dc bus between the battery pack and the three-phase inverter circuit.
Preferably, the compensation circuit comprises a connection terminal, three connection points on a first side of the connection terminal are connected to three phases at the input end of the three-phase rectification circuit one by one, and a connection point on a second side of the connection terminal is connected with the output end of the three-phase inverter circuit.
Preferably, when a single-phase loss occurs in a three-phase power grid, a second contact at the second side of the wiring terminal is connected to the center of a first bridge arm of the three-phase inverter circuit, the center of a third bridge arm of the three-phase inverter circuit is connected with a neutral line, the second contact at the second side of the wiring terminal is connected to a phase line of the three-phase power grid where the phase loss occurs through a selection switch, the voltage amplitude of the second contact at the second side of the wiring terminal is adjusted by controlling a first chopper circuit and a second chopper circuit, and the voltage frequency of the second contact at the second side of the wiring terminal is adjusted by controlling the switching frequency of the first bridge arm and the third bridge arm of the three-phase inverter circuit;
when two-phase loss occurs in a three-phase power grid, a third contact of a second side of the wiring terminal is connected to a normal phase line of the three-phase power grid through a selector switch, the third contact of the second side of the wiring terminal is connected with a first side of a primary side of a conversion transformer, a second contact of the second side of the wiring terminal is connected with a second side of the primary side of the conversion transformer, the third side of the primary side of the conversion transformer is connected with a neutral line, a first side of a secondary side of the conversion transformer is connected with the neutral line, a second side of the secondary side of the conversion transformer is connected with a first contact of the second side of the wiring terminal, and the first contact of the second side of the wiring terminal is connected to a phase line of the other phase loss of the three-phase power grid through the selector switch;
when a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and the first storage battery pack E1 and the second storage battery pack E2 are used for supplying power.
Preferably, the converter transformer includes:
the primary side of the first adjustable transformer is connected with a third contact of which the first side is connected with the second side of the wiring terminal, and the second side of the primary side of the first adjustable transformer is connected with a neutral wire;
the primary side of the second adjustable transformer is connected with a second contact point of which the first side is connected with the second side of the wiring terminal, and the secondary side of the primary side of the first adjustable transformer is connected with a neutral line;
the first side of the secondary side of the first adjustable transformer is connected with the neutral line, the second side of the secondary side of the first adjustable transformer is connected with the first side of the secondary side of the second adjustable transformer, and the second side of the secondary side of the second adjustable transformer is connected with the first contact of the second side of the wiring terminal.
Preferably, the direct-current bus further comprises an external inverter bridge arm, the center of the external inverter bridge arm and the center of a third bridge arm of the three-phase inverter circuit are connected to a neutral line through a fourth switch K4, and two ends of an upper bridge arm of the external inverter bridge arm are respectively connected in parallel with a first absorption capacitor C2 and a fourth switch Q4 which is controlled to be conducted to the positive electrode of the direct-current bus;
two ends of a lower bridge arm of the external inverter bridge arm are connected with a second absorption capacitor C3 in parallel, the anode of the second absorption capacitor C3 is connected to the cathode of a direct current bus through a second diode D2, the cathode of the second diode D2 is connected with the anode of the second absorption capacitor C3, the cathode of the second absorption capacitor C3 is connected to the centers of three bridge arms of the three-phase inverter circuit one by one in a one-way mode through a third switch K3, the centers of the three bridge arms of the three-phase inverter circuit are connected to the anode of the first absorption capacitor C2 one by one in a one-way mode, the cathode of the first absorption capacitor C2 is connected to the cathode of the direct current bus through a switch, and the anode of the second absorption capacitor C3 is connected to the anode of the direct current bus through a switch.
Preferably, when a single-phase loss occurs in a three-phase power grid, a second contact at the second side of the connecting terminal is connected to the center of a first bridge arm of the three-phase inverter circuit, the second contact at the second side of the connecting terminal is connected to a phase line of the three-phase power grid where the phase loss occurs through a selection switch, the voltage amplitude of the second contact at the second side of the connecting terminal is adjusted by controlling a first chopper circuit and a second chopper circuit, and the voltage frequency of the second contact at the second side of the connecting terminal is adjusted by controlling the switching frequency of the first bridge arm and a third bridge arm of the three-phase inverter circuit;
when two-phase loss occurs in a three-phase power grid, a first contact at the second side of the wiring terminal is connected to the center of a second bridge arm of the three-phase inverter circuit, and the first contact at the second side of the wiring terminal is connected to a phase line of the other phase loss of the three-phase power grid through a selection switch; the voltage frequency of a first contact on the second side of the wiring terminal is adjusted by controlling the switching frequency of a second bridge arm of the three-phase inverter circuit and the switching frequency of an external inverter bridge arm;
when a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and the first storage battery pack E1 and the second storage battery pack E2 are used for supplying power.
Preferably, the power supply device further comprises a water cooling loop for cooling the heating element inside the power supply device, and a water pump in the water cooling loop is connected with the first alternating current interface and the second alternating current interface simultaneously.
The invention at least comprises the following beneficial effects:
1. when the voltage of a power grid or a load fluctuates, the voltage of the direct current bus is stabilized through an energy storage battery on the direct current bus, so that the output voltage is ensured to be continuously stable;
2. when the power grid has a phase failure, the power grid is supported to be stable through the energy storage battery, so that the stable operation of the power supply device is ensured, and the fault-tolerant capability of the power supply device is improved;
3. in the phase-lack operation process of the power grid, the counter electromotive force generated by the inductive load in the circuit can be recycled into the energy storage battery, and the cruising ability of the system is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a circuit diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a converter transformer;
fig. 3 is a circuit diagram of a second embodiment of the invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in the figure, the invention provides a water-cooling high-power medium-high frequency power supply device which mainly comprises a three-phase rectification circuit, an inverter circuit, a direct-current bus voltage regulating circuit, an energy storage battery and a compensation loop for supporting a phase line where a power grid is in a phase failure.
The three-phase rectification and inversion circuit consists of three pairs of upper and lower bridge arms, the schematic of the circuit is given in the attached drawing, specifically, the three-phase rectification circuit can adopt a three-phase full-bridge controllable rectification circuit, the three-phase inversion circuit can adopt an IGBT full-bridge inversion circuit, and the input end of the three-phase rectification circuit is connected with a three-phase power grid; the three-phase rectification circuit is connected to a first alternating current interface through a first switch K1, the first alternating current interface is connected with an isolation transformer, and the output end of the isolation transformer is connected with an alternating current load; when the power grid is in a normal state, the alternating current load is connected to the output end of the isolation transformer, the power is directly supplied by the alternating current power supply of the power grid, the isolation transformer plays a role in isolating the influence of the fluctuation of the alternating current load to cause the fluctuation of the power grid, and the stability of the direct current voltage output by the power supply device is guaranteed.
The input end of the three-phase inverter circuit is connected with the direct current bus of the output end of the three-phase rectification circuit, and the output end of the three-phase inverter circuit is connected to the second alternating current interface through a second switch K2; the first end of the second alternating current interface is connected to the output end of the three-phase inverter circuit through the second switch K2, and the second end of the second alternating current interface is directly connected to an alternating current load. When the power grid is in a single-phase or two-phase open-phase state, the alternating current load is connected to the output end of the isolation transformer, and the power is directly supplied by a power grid alternating current power supply; when the three-phase-loss state of the power grid is realized, the output end of the alternating current load inverter circuit is powered by the energy storage battery.
The ac load includes a rotation device in the single crystal furnace, a cooling system in the power supply device, and the like.
The first storage battery pack E1 and the second storage battery pack E2 are connected between the direct-current buses in series, and the stored energy of the first storage battery pack E1 and the stored energy of the second storage battery pack E2 are used for stabilizing the voltage of the direct-current buses, so that the stability of direct current output by a power supply is ensured, and meanwhile, when a power grid is in a phase failure, a support is provided for a failed phase, and the power output of the power supply device is stabilized.
A first chopper circuit Z is connected in parallel with two ends of the second battery pack E2, a first terminal O1 of a direct current interface is connected with the output end of the first chopper circuit Z, a second terminal O2 of the direct current interface is connected with the negative electrode of a direct current bus, and a third terminal O3 of the direct current interface is connected with the positive electrode of the direct current bus through a first controllable switch Q1; the voltage between the first terminal O1 and the second terminal O2 is the voltage across the second battery pack E2, and the first chopper circuit Z functions to appropriately adjust the output voltage between the first terminal O1 and the second terminal O2. The voltage between the third terminal O3 and the second terminal O2 is the voltage across the first battery pack E1 and the second battery pack E2, and is also generally the voltage between the dc buses.
Therefore, the invention provides two direct current voltages, the higher direct current voltage is used for a main power supply of direct current loads such as a single crystal furnace and the like, namely for supplying power to a primary direct current load, and the lower direct current voltage is used for supplying a power supply for control, namely for supplying power to a secondary direct current load. The dc output voltage can be adjusted by the first chopper circuit Z and the second chopper circuit.
The first controllable switch Q1 is connected on a direct current bus at the output end of the three-phase rectifying circuit, a second controllable switch Q2 is connected in series on the positive electrode of the direct current bus between the first storage battery pack E1 and the first controllable switch Q1, and when the voltage of a power grid is unavailable, the storage battery pack is isolated from the power grid through the second controllable switch Q2, so that the influence on the storage battery pack is avoided. And a second chopper circuit is arranged on a direct current bus between the storage battery pack and the three-phase inverter circuit, and the second chopper circuit comprises an inductor L, a switch Q3, a capacitor C1 and a diode D1.
And the compensation loop is used for stabilizing the voltage at the input end of the three-phase rectification circuit and is connected between the output end of the three-phase inverter circuit and the input end of the three-phase rectification circuit. Specifically, the compensation circuit includes a binding post Lo, the three contact of binding post Lo first side is connected to one by one the three-phase of three-phase rectifier circuit input, the contact of binding post Lo second side with the three-phase inverter circuit output is connected. The connecting terminal Lo is sequentially provided with a first contact to a third contact from left to right.
Example one
As shown in fig. 1-2, when a single-phase loss occurs in a three-phase power grid, the second contact at the second side of the connecting terminal Lo is connected to the center of the first bridge arm of the three-phase inverter circuit, the center of the third bridge arm of the three-phase inverter circuit is connected to a neutral line, and a support is provided for a phase line where the phase loss occurs in the power grid through a single-phase inverter circuit composed of the first bridge arm and the third bridge arm of the three-phase inverter circuit. Specifically, a second contact of the second side of the connecting terminal Lo is connected to a phase line of the phase-lack position of the three-phase power grid through a selection switch in the connecting terminal Lo, the voltage amplitude of the second contact of the second side of the connecting terminal Lo is adjusted by controlling a first chopper circuit Z and a second chopper circuit, the voltage frequency of the second contact of the second side of the connecting terminal Lo is adjusted by controlling the switching frequency of a first bridge arm and a third bridge arm of a three-phase inverter circuit, the output voltage of the storage battery pack is connected to the phase line of the phase-lack position of the power grid through the selection switch in a proper phase after amplitude modulation and frequency modulation, the stability of the three-phase power grid power supply is ensured, the phase-lack power supply is compensated through the energy storage of the storage battery, other two paths of normal power supplies of the power grid are effectively utilized, the burden of the storage battery pack is reduced, and the endurance supporting capability is improved.
When two-phase loss occurs in a three-phase power grid, a third contact on the second side of the connecting terminal Lo is connected to a normal phase line of the three-phase power grid through a selector switch, the third contact on the second side of the connecting terminal Lo is connected with the first side of the primary side of a conversion transformer Y, the second contact on the second side of the connecting terminal Lo is connected with the second side of the primary side of the conversion transformer Y, the third side of the primary side of the conversion transformer Y is connected with a neutral line, the first side of the secondary side of the conversion transformer Y is connected with the neutral line, the second side of the secondary side of the conversion transformer Y is connected with the first contact on the second side of the connecting terminal Lo, and the first contact on the second side of the connecting terminal Lo is connected to a phase line of another phase loss of the three-phase power grid through the selector switch, so that a support is provided for the phase line of the another phase loss of the three-phase power grid, the stability of the three-phase power grid power supply is guaranteed, and the two-phase loss power supply of the power grid is compensated through the energy stored by the storage battery, meanwhile, other normal power supplies of the power grid are effectively utilized, the burden of the storage battery pack is reduced, and the endurance supporting capability is improved.
When a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and only the first storage battery pack E1 and the second storage battery pack E2 can be used for supplying power, or other standby power supplies can be used for supplying power.
In the above technical solution, the converter transformer Y is used for shifting a phase to match a phase of a second-path phase voltage of a power grid, so as to ensure stability and availability of a three-phase input power supply, and specifically, the converter transformer Y includes a first adjustable transformer T1 and a second adjustable transformer T2, a primary side of the first adjustable transformer T1 is connected to a third connection point Lo3, where a first side of the first adjustable transformer T1 is connected to a second side of the connection terminal Lo, and a secondary side of the primary side of the first adjustable transformer T1 is connected to a neutral line.
The primary side of a second adjustable transformer T2 is connected with a second contact Lo2 of which the first side is connected with the second side of the wiring terminal Lo, and the secondary side of the primary side of the first adjustable transformer T1 is connected with a neutral line; the secondary side first side a1 of the first adjustable transformer T1 is connected with a neutral line, the secondary side second side of the first adjustable transformer T1 is connected with the secondary side first side of the second adjustable transformer T2, and the secondary side second side a2 of the second adjustable transformer T2 is connected with a first contact of the connecting terminal Lo second side. The first adjustable transformer T1 and the second adjustable transformer T2 can also participate in the voltage regulation process, so that the voltage phase and amplitude of the first contact at the second side of the wiring terminal Lo meet the requirements of a second open-phase line of the power grid, and the stability of power input and output is ensured.
Example two
In another embodiment, as shown in fig. 3, the dc bus further includes an external inverter bridge arm, a center of the external inverter bridge arm and a center of a third bridge arm of the three-phase inverter circuit are connected to a neutral line through a fourth switch K4, and two ends of an upper bridge arm of the external inverter bridge arm are respectively connected in parallel to a first absorption capacitor C2 and a fourth switch Q4 controlled to be turned on to the positive electrode of the dc bus; specifically, the positive electrode of the first absorption capacitor C2 is connected with the center of the upper bridge arm of the external inverter bridge arm, and the negative electrode of the first absorption capacitor C2 is connected to the positive electrode of the direct current bus through a diode.
Similarly, two ends of the lower bridge arm of the external inverter bridge arm are connected in parallel with a second absorption capacitor C3, the anode of the second absorption capacitor C3 is connected to the cathode of the direct-current bus through a second diode D2, the cathode of the second diode D2 is connected with the anode of the second absorption capacitor C3, the cathode of the second absorption capacitor C3 is sequentially connected to the centers of the three bridge arms of the three-phase inverter circuit in a one-way mode one by one through a diode and a third switch K3, and the first absorption capacitor C2 and the second absorption capacitor C3 are used for absorbing the back electromotive force of the inductive alternating-current load.
The centers of three bridge arms of the three-phase inverter circuit are connected to the anode of the first absorption capacitor C2 one by one in a one-way mode, and a switch K5 is arranged on a connecting line between the centers of the three bridge arms of the three-phase inverter circuit and the anode of the first absorption capacitor C2. The negative electrode of the first absorption capacitor C2 is connected to the negative electrode of the direct-current bus through a switch, the positive electrode of the second absorption capacitor C3 is connected to the positive electrode of the direct-current bus through a switch, when the positive electrode of the first absorption capacitor C2 is connected with the negative electrode of the second absorption capacitor C3, the first absorption capacitor C2 and the second absorption capacitor C3 are connected in series, the positive electrode of the capacitor after series connection is connected with the positive electrode of the direct-current bus, and the negative electrode of the capacitor after series connection is connected with the negative electrode of the direct-current bus, so that the energy stored in the series capacitor after boosting can be fed back to the storage battery pack on the direct-current bus, and the cruising ability of the storage battery pack during open-phase failure is improved.
When a single-phase failure occurs in a three-phase power grid, a second contact of a second side of the connecting terminal Lo is connected to the center of a first bridge arm of the three-phase inverter circuit, the second contact of the second side of the connecting terminal Lo is connected to a phase line where the phase failure of the three-phase power grid exists through a selection switch, the voltage amplitude of the second contact of the second side of the connecting terminal Lo is adjusted by controlling a first chopper circuit Z and a second chopper circuit, and the voltage frequency of the second contact of the second side of the connecting terminal Lo is adjusted by controlling the switching frequency of the first bridge arm and a third bridge arm of the three-phase inverter circuit;
the three-phase inverter circuit comprises a first bridge arm and a third bridge arm, wherein the first bridge arm and the third bridge arm form a single-phase inverter, the output voltage of the storage battery pack is connected to a phase line where the power grid is in a phase failure through a selection switch after amplitude modulation and frequency modulation, the stability of a three-phase power grid power supply is guaranteed, the phase failure power supply is compensated through the energy storage of the storage battery, other two paths of normal power supplies of the power grid are effectively utilized, the burden of the storage battery pack is reduced, and the endurance supporting capability is improved.
When two-phase loss occurs in a three-phase power grid, a first contact at the second side of the connecting terminal Lo is connected to the center of a second bridge arm of the three-phase inverter circuit, and the first contact at the second side of the connecting terminal Lo is connected to a phase line of the other phase loss of the three-phase power grid through a selection switch; the voltage frequency of a first contact on the second side of the connecting terminal Lo is adjusted by controlling the switching frequency of a second bridge arm of the three-phase inverter circuit and the switching frequency of an external inverter bridge arm;
the second bridge arm of the three-phase inverter circuit and the external inverter bridge arm form a single-phase inverter, the output voltage of the storage battery pack is connected to the phase line of the other phase-lacking position of the power grid through a selection switch at a proper phase after amplitude modulation and frequency modulation, the stability of the three-phase power grid is ensured, the phase-lacking power supply is compensated through the energy storage of the storage battery, other two paths of normal power supplies of the power grid are effectively utilized, the burden of the storage battery pack is reduced, and the endurance supporting capability is improved.
When a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and the first storage battery pack E1 and the second storage battery pack E2 are used for supplying power.
In the above technical solution, the power supply device further includes a water cooling circuit for cooling a heating element inside the power supply device, and specifically includes a rotating device and a cooling system in the electric heating device such as the single crystal furnace, and a cooling system in the power supply device, and power supply ends of these inductive ac devices are connected to the first ac interface and the second ac interface at the same time. When the power grid is in a normal state or single-phase and double-phase loss, the power is supplied through the first alternating current interface, and the counter electromotive force of the inductive alternating current load is not collected; when the power grid is in phase failure, the inductive load is supplied with power through the second alternating current interface, the counter electromotive force of the inductive load generated by the turn-off of the lower bridge arm of the three-phase inverter circuit is collected in the first absorption capacitor C2, the counter electromotive force of the inductive load generated by the turn-off of the upper bridge arm of the three-phase inverter circuit is collected in the second absorption capacitor C3, and when the first absorption capacitor C2 and the second absorption capacitor C3 are connected in series and fed back to a direct current bus, the storage battery pack can be charged.
When the power grid is in single-phase and double-phase loss, and the system consumes more energy, the inductive AC load is connected to the second AC interface, the back electromotive force is recovered for continuation of the journey of the storage battery pack, and when the system consumes less energy, the inductive AC load is connected to the first AC interface.
According to the invention, when the power grid or the load voltage fluctuates, the voltage of the direct current bus is stabilized through the energy storage battery on the direct current bus, so that the output voltage is ensured to be continuously stable; when the power grid has a phase failure, the power grid is supported to be stable through the energy storage battery, so that the stable operation of the power supply device is ensured, and the fault-tolerant capability of the power supply device is improved; meanwhile, in the phase-loss operation process of the power grid, the counter electromotive force generated by the inductive load in the circuit can be recovered to the energy storage battery, and the cruising ability of the system is improved.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. A water-cooled high-power medium-high frequency power supply device is characterized by comprising:
the input end of the three-phase rectifying circuit is connected with a three-phase power grid; the three-phase rectification circuit is connected to the first alternating current interface through a first switch K1;
the input end of the three-phase inverter circuit is connected with the direct-current bus of the output end of the three-phase rectification circuit, and the output end of the three-phase inverter circuit is connected to the second alternating-current interface through a second switch K2;
the first storage battery pack E1 and the second storage battery pack E2 are connected in series between the direct current buses, and a first chopper circuit is connected in parallel at two ends of the second storage battery pack E2;
a first terminal of the direct current interface is connected with the output end of the first chopper circuit, a second terminal of the direct current interface is connected with the negative electrode of a direct current bus, and a third terminal of the direct current interface is connected with the positive electrode of the direct current bus through a first controllable switch Q1;
and the compensation loop is used for stabilizing the voltage at the input end of the three-phase rectification circuit and is connected between the output end of the three-phase inverter circuit and the input end of the three-phase rectification circuit.
2. The water-cooled high-power medium-high frequency power supply device as claimed in claim 1, wherein the first ac interface is connected to an isolation transformer, and an output terminal of the isolation transformer is connected to an ac load; the first end of the second alternating current interface is connected to the output end of the three-phase inverter circuit through the second switch K2, and the second end of the second alternating current interface is directly connected to an alternating current load.
3. The water-cooled high-power medium-high-frequency power supply device according to claim 2, wherein the first terminal and the second terminal are connected to a secondary dc load, and the third terminal and the second terminal are connected to a primary dc load.
4. The water-cooled high-power medium-high frequency power supply device as claimed in claim 3, wherein a first controllable switch Q1 is connected to a DC bus at the output end of the three-phase rectification circuit, a second controllable switch Q2 is connected in series to the positive pole of the DC bus between the first battery pack E1 and the first controllable switch Q1, and a second chopper circuit is arranged on the DC bus between the battery pack and the three-phase inverter circuit.
5. The water-cooled high-power medium-high frequency power supply device as claimed in claim 4, wherein the compensation circuit comprises a connection terminal, three connection points on a first side of the connection terminal are connected to three phases of the input end of the three-phase rectification circuit one by one, and a connection point on a second side of the connection terminal is connected to the output end of the three-phase inversion circuit.
6. The water-cooled high-power medium-high frequency power supply device as claimed in claim 5, wherein when a single-phase loss occurs in a three-phase power grid, the second contact of the second side of the connection terminal is connected to the center of the first bridge arm of the three-phase inverter circuit, the center of the third bridge arm of the three-phase inverter circuit is connected to a neutral line, the second contact of the second side of the connection terminal is connected to a phase line of the three-phase power grid where the phase loss occurs through a selection switch, the voltage amplitude of the second contact of the second side of the connection terminal is adjusted by controlling the first chopper circuit and the second chopper circuit, and the voltage frequency of the second contact of the second side of the connection terminal is adjusted by controlling the switching frequencies of the first bridge arm and the third bridge arm of the three-phase inverter circuit;
when two-phase loss occurs in a three-phase power grid, a third contact of a second side of the wiring terminal is connected to a normal phase line of the three-phase power grid through a selector switch, the third contact of the second side of the wiring terminal is connected with a first side of a primary side of a conversion transformer, a second contact of the second side of the wiring terminal is connected with a second side of the primary side of the conversion transformer, the third side of the primary side of the conversion transformer is connected with a neutral line, a first side of a secondary side of the conversion transformer is connected with the neutral line, a second side of the secondary side of the conversion transformer is connected with a first contact of the second side of the wiring terminal, and the first contact of the second side of the wiring terminal is connected to a phase line of the other phase loss of the three-phase power grid through the selector switch;
when a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and the first storage battery pack E1 and the second storage battery pack E2 are used for supplying power.
7. The water-cooled high-power medium-high frequency power supply device according to claim 6, wherein the converter transformer comprises:
the primary side of the first adjustable transformer is connected with a third contact of which the first side is connected with the second side of the wiring terminal, and the second side of the primary side of the first adjustable transformer is connected with a neutral wire;
the primary side of the second adjustable transformer is connected with a second contact point of which the first side is connected with the second side of the wiring terminal, and the secondary side of the primary side of the first adjustable transformer is connected with a neutral line;
the first side of the secondary side of the first adjustable transformer is connected with the neutral line, the second side of the secondary side of the first adjustable transformer is connected with the first side of the secondary side of the second adjustable transformer, and the second side of the secondary side of the second adjustable transformer is connected with the first contact of the second side of the wiring terminal.
8. The water-cooled high-power medium-high frequency power supply device as claimed in claim 5, wherein the dc bus further comprises an external inverter bridge arm, the center of the external inverter bridge arm and the center of the third bridge arm of the three-phase inverter circuit are connected to a neutral line through a fourth switch K4, and two ends of the upper bridge arm of the external inverter bridge arm are respectively connected in parallel with a first absorption capacitor C2 and a fourth switch Q4 controlled to be conducted to the positive electrode of the dc bus;
two ends of a lower bridge arm of the external inverter bridge arm are connected with a second absorption capacitor C3 in parallel, the anode of the second absorption capacitor C3 is connected to the cathode of a direct current bus through a second diode D2, the cathode of the second diode D2 is connected with the anode of the second absorption capacitor C3, the cathode of the second absorption capacitor C3 is connected to the centers of three bridge arms of the three-phase inverter circuit one by one in a one-way mode through a third switch K3, the centers of the three bridge arms of the three-phase inverter circuit are connected to the anode of the first absorption capacitor C2 one by one in a one-way mode, the cathode of the first absorption capacitor C2 is connected to the cathode of the direct current bus through a switch, and the anode of the second absorption capacitor C3 is connected to the anode of the direct current bus through a switch.
9. The water-cooled high-power medium-high frequency power supply device as claimed in claim 8, wherein when a single-phase loss occurs in a three-phase power grid, the second contact of the second side of the connecting terminal is connected to the center of the first bridge arm of the three-phase inverter circuit, the second contact of the second side of the connecting terminal is connected to the phase line of the phase loss of the three-phase power grid through a selector switch, the voltage amplitude of the second contact of the second side of the connecting terminal is adjusted by controlling the first chopper circuit and the second chopper circuit, and the voltage frequency of the second contact of the second side of the connecting terminal is adjusted by controlling the switching frequency of the first bridge arm and the third bridge arm of the three-phase inverter circuit;
when two-phase loss occurs in a three-phase power grid, a first contact at the second side of the wiring terminal is connected to the center of a second bridge arm of the three-phase inverter circuit, and the first contact at the second side of the wiring terminal is connected to a phase line of the other phase loss of the three-phase power grid through a selection switch; the voltage frequency of a first contact on the second side of the wiring terminal is adjusted by controlling the switching frequency of a second bridge arm of the three-phase inverter circuit and the switching frequency of an external inverter bridge arm;
when a three-phase fault occurs in the three-phase power grid, the three-phase power grid is cut off, and the first storage battery pack E1 and the second storage battery pack E2 are used for supplying power.
10. The water-cooled high-power medium-high frequency power supply device as claimed in claim 6 or 8, further comprising a water-cooling loop for cooling internal heating elements of the power supply device, wherein a water pump in the water-cooling loop is connected with the first AC interface and the second AC interface at the same time.
CN202111029560.6A 2021-09-03 2021-09-03 Water-cooling high-power medium-high frequency power supply device Active CN113507219B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102299523A (en) * 2011-08-23 2011-12-28 武汉钢铁(集团)公司 Dynamic voltage restorer for three-phase four-line system power distribution network
CN105262204A (en) * 2015-09-10 2016-01-20 上海超硅半导体有限公司 Monocrystal silicon growth partitioned uninterruptable and stable power supply technology

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102299523A (en) * 2011-08-23 2011-12-28 武汉钢铁(集团)公司 Dynamic voltage restorer for three-phase four-line system power distribution network
CN105262204A (en) * 2015-09-10 2016-01-20 上海超硅半导体有限公司 Monocrystal silicon growth partitioned uninterruptable and stable power supply technology

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