CN110224581A - A kind of common-mode voltage inhibition system - Google Patents
A kind of common-mode voltage inhibition system Download PDFInfo
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- CN110224581A CN110224581A CN201910454232.7A CN201910454232A CN110224581A CN 110224581 A CN110224581 A CN 110224581A CN 201910454232 A CN201910454232 A CN 201910454232A CN 110224581 A CN110224581 A CN 110224581A
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Classifications
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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Abstract
A kind of common-mode voltage inhibits system, and the input terminal of electric power electric transformer is connect with mesohigh power grid in system, and output end is connect with the low-voltage direct bus；The input terminal of the low pressure inverter DC/AC device is connect with the low-voltage direct bus, and output end and low-voltage alternating-current load connect；The non-isolation type DC/DC device input terminal is parallel to the low-voltage direct bus, and output end loads with low-voltage direct connect respectively；The outlet side of the low pressure inverter DC/AC device is connect with the input side of the non-isolation type DC/DC device, constructs the low-impedance path of common-mode voltage.Pass through the input side of outlet side and the non-isolation type DC/DC device in low pressure inverter DC/AC device in this programme, construct the low-impedance path of common-mode voltage, DC side can effectively inhibit exchange side common-mode voltage, solve the problems, such as that non-isolation type ac-dc power supply circuit common-mode voltage is excessive and interferes power supply process.
Description
Technical field
The present invention relates to alternating current-direct current electricity supply and use technology fields, and in particular to a kind of common-mode voltage inhibition system.
Background technique
Supplied by AC/DC electricity system is the core of the following alternating current-direct current power distribution network that will be risen, and is responsible for transformation of electrical energy
The key player of (including voltage class transformation, frequency transformation, supplied by AC/DC electricity mode conversion etc.) and electric energy supply, core skill
Art is power electronics equipment technology.Practical application design when, in order to improve equipment power density, reduce equipment manufacture at
This considers that the low-voltage alternating-current side being often equipped with mostly uses high power three-phase three-wire system non-isolation type in view of other design factors
Inverter is powered to low-voltage alternating-current load, the low-voltage direct side of equipment mostly uses high-power non-isolation type direct-current/direct current (DC/DC)
Converter is powered to low-voltage direct load.
However, being mostly three-phase and four-line (or Three-phase five-wire) in the power supply mode of connection that most occasion low-voltage alternating-current loads need
System, and the earthing mode of low-voltage direct load is mostly that (I=power end is earth-free or through high resistance grounding by IT；T=electric device
Exposed conductive part be directly grounded, this grounding point is electrically independently of the grounding point of power end) Contact patch.In this feelings
If do not handled the mode of connection of supplied by AC/DC electricity system under condition, will lead to can not give four phase of low voltage three-phase (or three-phase
Five lines) AC load processed power supply, in addition, if not on low-voltage AC/DC bus because converter device uses PWM (pulse width
Modulation) technology generate common-mode voltage handled, then excessively high common-mode voltage will damage low-voltage AC/DC load.
Summary of the invention
It not can be carried out three-phase and four-line or three-phase five-wire mode power supply to solve existing system in the presence of the prior art, and hand over
There is common mode interference in DC side, the present invention provides a kind of common-mode voltages to inhibit system.
Present invention provide the technical scheme that
A kind of common-mode voltage inhibition system, the system, comprising:
Electric power electric transformer, low-voltage direct bus, low pressure inverter DC/AC device and non-isolation type DC/DC device；
The input terminal of the electric power electric transformer is connect with mesohigh power grid, and output end and the low-voltage direct bus connect
It connects；
The input terminal of the low pressure inverter DC/AC device is connect with the low-voltage direct bus, and output end and low pressure are handed over
Current load connection；
The non-isolation type DC/DC device input terminal is parallel to the low-voltage direct bus, output end respectively with low-pressure direct
Current load connection；
The outlet side of the low pressure inverter DC/AC device is connect with the input side of the non-isolation type DC/DC device, structure
Build the low-impedance path of common-mode voltage.
Preferably, the inverter DC/AC device, comprising:
DC side DC support capacitor, power semiconductor switch and exchange side LC filter；
The DC side DC support capacitor and the power semiconductor switch are successively attempted by the low-voltage direct bus
On；
Exchange side LC filter is connected between the power semiconductor switch and low-voltage alternating-current load；
The exchange side LC filter is also connect with the input side of the non-isolation type DC/DC device, constructs common-mode voltage
Low-impedance path.
Preferably, exchange side LC filter, comprising:
Three filter reactances, three filter capacitors and tank capacitance；
The filter reactance is connect with the semiconductor switch；
After the filter capacitor star-like connection, and the filter reactance and connect；
The input terminal of the neutral point of the filter capacitor star-like connection and the non-isolation type DC/DC device is returned by described
Road capacitance connection.
Preferably, the non-isolation type DC/DC device, comprising:
Input side DC support capacitor, power semiconductor switch and outlet side LC filter；
The power semiconductor switch is attempted by the input side DC support capacitor；
The input terminal of the outlet side LC filter is connect with the power semiconductor switch, output end with it is described low
The connection of straightening current load.
Preferably, the system, further includes:
Common mode reactance, to exchange side common mode capacitance and common mode capacitance over the ground；
The input terminal of the common mode reactance is attempted by the low-voltage direct bus, and output end successively and connects described pair of exchange
Side common mode capacitance and the common mode capacitance over the ground；
Described pair of exchange side common mode capacitance is connect by the tank capacitance with the neutral point, and the low of common-mode voltage is constructed
Impedance path；
The ground connection of common mode capacitance over the ground.
Preferably, described pair of exchange side common mode capacitance, comprising:
First common mode capacitance and the second common mode capacitance；
After first common mode capacitance and the second common mode capacitance concatenation, it is integrally connected to the output end of common mode reactance；
The midpoint of described pair of exchange side common mode capacitance is connect with the neutral point, constructs the low-impedance path of common-mode voltage.
Preferably, the common mode capacitance over the ground, comprising:
First common mode capacitance and the second common mode capacitance over the ground over the ground；
Described first common mode capacitance and second over the ground after common mode capacitance concatenation over the ground, whole with described pair to exchange side common mode electric
Hold in parallel；
The connection neutral earthing of described first common mode capacitance and the second common mode capacitance over the ground over the ground.
Preferably, the system, further includes:
Z-type grounding transformer, ground connection become coupled voltages filter capacitor, alternating-current switch, low-voltage alternating current power supply and zero curve；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and alternating-current switch is attempted by the phase three-wire three
On output end；
The alternating-current switch is connect with the low-voltage alternating current power supply；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and low-voltage alternating current power supply jointly with the zero curve
Connection；
The zero curve and low-voltage alternating-current load connect, and constitute three-phase four-line system；
The zero curve can be also grounded, and constitute three-phase five-wire mode circuit.
Preferably, the ground connection becomes coupled voltages filter capacitor, comprising:
Three capacitors；
After the capacitor star-like connection, and the output end for exchanging side LC filter and connect；
The neutral point of the capacitor star-like connection is connect with the zero curve.
Preferably, the electric power electric transformer device, comprising:
High-voltage alternating reactance device, high voltage direct current reactance device, high-voltage alternating unit, high voltage direct current unit, high frequency transformer every
From unit and low-voltage direct unit；
Described high-voltage alternating reactance device one end is connect with high-voltage ac power, and the other end is connect with high-voltage alternating unit；
Described high voltage direct current reactance device one end is connect with high-voltage DC power supply, and the other end is connect with high voltage direct current unit；
The high-voltage alternating unit and high-voltage DC power supply pass through the high frequency transformer isolated location and the low-pressure direct
Flow unit connection；
The low-voltage direct unit is attempted by the low-voltage direct bus.
Compared with prior art, the invention has the benefit that
Technical solution provided by the invention, comprising: electric power electric transformer, low-voltage direct bus, low pressure inverter DC/AC
Device and non-isolation type DC/DC device；The input terminal of the electric power electric transformer is connect with mesohigh power grid, output end and institute
State the connection of low-voltage direct bus；The input terminal of the low pressure inverter DC/AC device is connect with the low-voltage direct bus, output
End is connected with low-voltage alternating-current load；The non-isolation type DC/DC device input terminal is parallel to the low-voltage direct bus, output end
It loads and connects with low-voltage direct respectively；The outlet side and the non-isolation type DC/DC device of the low pressure inverter DC/AC device
Input side connection, construct the low-impedance path of common-mode voltage.Pass through the output in low pressure inverter DC/AC device in this programme
The input side of side and the non-isolation type DC/DC device, constructs the low-impedance path of common-mode voltage, can be by DC side to exchange side
Common-mode voltage is effectively inhibited, and it is excessive and interfere power supply process to solve non-isolation type ac-dc power supply circuit common-mode voltage
Problem.
In the present solution, the power supply mode of three-phase and four-line or three-phase five-wire mode is constructed by low pressure inverter DC/AC device, to
Low-voltage alternating-current load supplying；Non-isolation type DC/DC device in this programme can construct the power supply of three-phase and four-line or three-phase five-wire mode
Mode solves the power demands of low-voltage alternating-current load to low-voltage direct load supplying.
Detailed description of the invention
Fig. 1 is that common-mode voltage of the invention inhibits system schematic.
Specific embodiment
For a better understanding of the present invention, the contents of the present invention are done further with example with reference to the accompanying drawings of the specification
Explanation.
Embodiment 1:
A kind of common-mode voltage inhibition system is present embodiments provided, common-mode voltage inhibits system schematic, as shown in Figure 1,
Usually it is made of electric power electric transformer device, inverter DC/AC device and DC/DC device etc..
Electric power electric transformer device is usually isolated by high-voltage alternating unit, high voltage direct current unit, high frequency transformer in figure
Unit, low-voltage direct unit, high-voltage alternating reactance device Lac, high voltage direct current smoothing reactor LdcDeng composition；Electric power electric transformer
Pass through reactor Lac, alternating-current switch QF1 connect with high-voltage ac power, and pass through smoothing reactor Ldc, dc switch QS1
It is connect with high-voltage DC power supply；Low-voltage direct unit is connected with low-voltage direct bus.Electric power electric transformer is responsible for voltage herein
The transformation of grade and the transformation of voltage alternating current-direct current form, and the energy between high-voltage alternating, high voltage direct current and low-voltage direct
Trend can mutually flow.
Figure mesolow inverter DC/AC device is usually by DC support capacitor, power semiconductor switch group and LC type
Filter composition (low pressure inverter DC/AC herein is three-phase three-wire system), is responsible for the transformation of low-voltage power supply alternating current-direct current form, electricity
Energy energy can mutually flow between AC and DC side.Low pressure inverter DC/AC device exchanges side and passes through Z-type grounding transformer
Three-phase firewire A, B, the C for constructing zero curve N, zero curve N and low pressure inverter DC/AC output constitute three-phase four-wire power supply mode, such as
Fruit zero curve N is connected with ground wire again, constitutes three-phase five-wire mode power supply mode；Low pressure inverter DC/AC device can also be opened by exchange
Pass QF2 is connected with low-voltage alternating current power supply carries out parallel running.
Non-isolation type DC/DC device is usually by the DC support capacitor of input side, power semiconductor switch assembly
And outlet side LC mode filter composition, it is responsible for the transformation of low-voltage DC supply voltage class, electric energy energy can be single-phase or double
To flowing.
The present invention installs one group of Z-type grounding transformer (this transformation additional in low pressure inverter DC/AC device exchange outlet side first
Device input terminal is connected with three-phase low-voltage ac bus A, B, C, and output end is connected with zero curve N and the earth) and one group of transformer coupling
Close voltage filter capacitor Cf(three phase capacitance is connected in parallel on the input/output terminal of Z-type grounding transformer respectively, connects for filtering out Z-type
Ground becomes induced voltage caused by input and output coupling leakage inductance), and install one additional at the three phase capacitance centerline O of LC mode filter
The one end a capacitor C, capacitor C is connected with neutral point O；In addition female in the low-voltage direct of each non-isolation type DC/DC device input side
Install one group of common mode inductance Ln, one group of common mode capacitance C to exchange side on line additionaln1、Cn2And one group of common mode capacitance C over the groundn3、
Cn4；The capacitor C wherein installed additional on the other end of capacitor C and each isolated form DC/DC device input side low-voltage direct busn1、Cn2
The neutral point O n of formation is connected；Furthermore the common mode over the ground installed additional on each isolated form DC/DC device input side low-voltage direct bus
Capacitor Cn3、Cn4The neutral point of formation is directly connected with the earth grounding point.
Thus the connection relationship constituted meets access way (three-phase and four-line or the Three-phase five-wire of low-voltage alternating-current load first
System) it requires, and a ground connection reference potential N is provided for supplied by AC/DC electricity system, in addition this connection type can be DC side
Common mode current caused by common-mode voltage to exchange side establishes Low ESR flow cycle, because adding additional common mode in this circuit
Reactor Ln, so can filter DC side in this common mode reactor and exchange side LC to most of common-mode voltage landing of exchange side
In wave device reactance, to ensure that the input of non-isolation type DC/DC device and output bus make the inhibition of exchange side common-mode voltage
With；In addition to this, the common mode capacitance over the ground installed additional on the low-voltage direct bus of each non-isolation type DC/DC device input side
Cn3、Cn4A low-impedance path is also constituted with Z-type grounding transformer, this circuit can be by the big portion of low-voltage direct bus over the ground
Divide common-mode voltage to drop on common mode reactor Ln and exchange side LC filter reactance, further ensures non-isolation type DC/DC
The inhibiting effect of device input and outlet side common-mode voltage over the ground.
Embodiment two:
Present embodiments provide a kind of common-mode voltage inhibition system, the system, comprising:
Electric power electric transformer, low-voltage direct bus, low pressure inverter DC/AC device and non-isolation type DC/DC device；
The input terminal of the electric power electric transformer is connect with mesohigh power grid, and output end and the low-voltage direct bus connect
It connects；
The input terminal of the low pressure inverter DC/AC device is connect with the low-voltage direct bus, and output end and low pressure are handed over
Current load connection；
The non-isolation type DC/DC device input terminal is parallel to the low-voltage direct bus, output end respectively with low-pressure direct
Current load connection；
The outlet side of the low pressure inverter DC/AC device is connect with the input side of the non-isolation type DC/DC device, structure
Build the low-impedance path of common-mode voltage；
The mesohigh power grid is direct current mesohigh power grid or exchange mesohigh power grid.
The inverter DC/AC device, comprising:
DC side DC support capacitor, power semiconductor switch and exchange side LC filter；
The DC side DC support capacitor and the power semiconductor switch are successively attempted by the low-voltage direct bus
On；
Exchange side LC filter is connected between the power semiconductor switch and low-voltage alternating-current load；
The exchange side LC filter is also connect with the input side of the non-isolation type DC/DC device, constructs common-mode voltage
Low-impedance path.
Exchange side LC filter, comprising:
Three filter reactances, three filter capacitors and tank capacitance；
The filter reactance is connect with the semiconductor switch；
After the filter capacitor star-like connection, and the filter reactance and connect；
The input terminal of the neutral point of the filter capacitor star-like connection and the non-isolation type DC/DC device is returned by described
Road capacitance connection.
The non-isolation type DC/DC device, comprising:
Input side DC support capacitor, power semiconductor switch and outlet side LC filter；
The power semiconductor switch is attempted by the input side DC support capacitor；
The input terminal of the outlet side LC filter is connect with the power semiconductor switch, output end with it is described low
The connection of straightening current load.
The system, further includes:
Common mode reactance, to exchange side common mode capacitance and common mode capacitance over the ground；
The input terminal of the common mode reactance is attempted by the low-voltage direct bus, and output end successively and connects described pair of exchange
Side common mode capacitance and the common mode capacitance over the ground；
Described pair of exchange side common mode capacitance is connect by the tank capacitance with the neutral point, and the low of common-mode voltage is constructed
Impedance path；
The ground connection of common mode capacitance over the ground.
Described pair of exchange side common mode capacitance, comprising:
First common mode capacitance and the second common mode capacitance；
After first common mode capacitance and the second common mode capacitance concatenation, it is integrally connected to the output end of common mode reactance；
The midpoint of described pair of exchange side common mode capacitance is connect with the neutral point, constructs the low-impedance path of common-mode voltage.
The common mode capacitance over the ground, comprising:
First common mode capacitance and the second common mode capacitance over the ground over the ground；
Described first common mode capacitance and second over the ground after common mode capacitance concatenation over the ground, whole with described pair to exchange side common mode electric
Hold in parallel；
The connection neutral earthing of described first common mode capacitance and the second common mode capacitance over the ground over the ground.
The system, further includes:
Z-type grounding transformer, ground connection become coupled voltages filter capacitor, alternating-current switch, low-voltage alternating current power supply and zero curve；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and alternating-current switch is attempted by the phase three-wire three
On output end；
The alternating-current switch is connect with the low-voltage alternating current power supply；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and low-voltage alternating current power supply jointly with the zero curve
Connection；
The zero curve and low-voltage alternating-current load connect, and constitute three-phase four-line system；
The zero curve can be also grounded, and constitute three-phase five-wire mode circuit.
The ground connection becomes coupled voltages filter capacitor, comprising:
Three capacitors；
After the capacitor star-like connection, and the output end for exchanging side LC filter and connect；
The neutral point of the capacitor star-like connection is connect with the zero curve.
The electric power electric transformer device, comprising:
High-voltage alternating reactance device, high voltage direct current reactance device, high-voltage alternating unit, high voltage direct current unit, high frequency transformer every
From unit and low-voltage direct unit；
Described high-voltage alternating reactance device one end is connect with high-voltage ac power, and the other end is connect with high-voltage alternating unit；
Described high voltage direct current reactance device one end is connect with high-voltage DC power supply, and the other end is connect with high voltage direct current unit；
The high-voltage alternating unit and high-voltage DC power supply pass through the high frequency transformer isolated location and the low-pressure direct
Flow unit connection；
The low-voltage direct unit is attempted by the low-voltage direct bus.
Obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, all other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (10)
1. a kind of common-mode voltage inhibits system, which is characterized in that the system, comprising:
Electric power electric transformer, low-voltage direct bus, low pressure inverter DC/AC device and non-isolation type DC/DC device；
The input terminal of the electric power electric transformer is connect with mesohigh power grid, and output end is connect with the low-voltage direct bus；
The input terminal of the low pressure inverter DC/AC device is connect with the low-voltage direct bus, and output end and low-voltage alternating-current are negative
Carry connection；
The non-isolation type DC/DC device input terminal is parallel to the low-voltage direct bus, and output end is negative with low-voltage direct respectively
Carry connection；
The outlet side of the low pressure inverter DC/AC device is connect with the input side of the non-isolation type DC/DC device, and building is altogether
The low-impedance path of mode voltage.
2. the system as claimed in claim 1, which is characterized in that the inverter DC/AC device, comprising:
DC side DC support capacitor, power semiconductor switch and exchange side LC filter；
The DC side DC support capacitor and the power semiconductor switch are successively attempted by the low-voltage direct bus；
Exchange side LC filter is connected between the power semiconductor switch and low-voltage alternating-current load；
The exchange side LC filter is also connect with the input side of the non-isolation type DC/DC device, constructs the low of common-mode voltage
Impedance path.
3. system as claimed in claim 2, which is characterized in that exchange side LC filter, comprising:
Three filter reactances, three filter capacitors and tank capacitance；
The filter reactance is connect with the semiconductor switch；
After the filter capacitor star-like connection, and the filter reactance and connect；
The input terminal of the neutral point of the filter capacitor star-like connection and the non-isolation type DC/DC device passes through the circuit electricity
Hold connection.
4. system as claimed in claim 3, which is characterized in that the non-isolation type DC/DC device, comprising:
Input side DC support capacitor, power semiconductor switch and outlet side LC filter；
The power semiconductor switch is attempted by the input side DC support capacitor；
The input terminal of the outlet side LC filter is connect with the power semiconductor switch, output end and the low-pressure direct
Current load connection.
5. system as claimed in claim 4, which is characterized in that the system, further includes:
Common mode reactance, to exchange side common mode capacitance and common mode capacitance over the ground；
The input terminal of the common mode reactance is attempted by the low-voltage direct bus, and output end is successively and to connect described pair of exchange side total
Mould capacitor and the common mode capacitance over the ground；
Described pair of exchange side common mode capacitance is connect by the tank capacitance with the neutral point, and the Low ESR of common-mode voltage is constructed
Circuit；
The ground connection of common mode capacitance over the ground.
6. system as claimed in claim 5, which is characterized in that described pair of exchange side common mode capacitance, comprising:
First common mode capacitance and the second common mode capacitance；
After first common mode capacitance and the second common mode capacitance concatenation, it is integrally connected to the output end of common mode reactance；
The midpoint of described pair of exchange side common mode capacitance is connect with the neutral point, constructs the low-impedance path of common-mode voltage.
7. system as claimed in claim 5, which is characterized in that the common mode capacitance over the ground, comprising:
First common mode capacitance and the second common mode capacitance over the ground over the ground；
Described first over the ground common mode capacitance and second it is whole to exchange side common mode capacitance simultaneously with described pair over the ground after common mode capacitance concatenation
Connection；
The connection neutral earthing of described first common mode capacitance and the second common mode capacitance over the ground over the ground.
8. system as claimed in claim 2, which is characterized in that the system, further includes:
Z-type grounding transformer, ground connection become coupled voltages filter capacitor, alternating-current switch, low-voltage alternating current power supply and zero curve；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and alternating-current switch is attempted by the phase three-wire three output
On end；
The alternating-current switch is connect with the low-voltage alternating current power supply；
The Z-type grounding transformer, ground connection become coupled voltages filter capacitor and low-voltage alternating current power supply is connect with the zero curve jointly；
The zero curve and low-voltage alternating-current load connect, and constitute three-phase four-line system；
The zero curve can be also grounded, and constitute three-phase five-wire mode circuit.
9. system as claimed in claim 8, which is characterized in that the ground connection becomes coupled voltages filter capacitor, comprising:
Three capacitors；
After the capacitor star-like connection, and the output end for exchanging side LC filter and connect；
The neutral point of the capacitor star-like connection is connect with the zero curve.
10. the system as claimed in claim 1, which is characterized in that the electric power electric transformer device, comprising:
High-voltage alternating reactance device, high voltage direct current reactance device, high-voltage alternating unit, high voltage direct current unit, high frequency transformer isolation are single
Member and low-voltage direct unit；
Described high-voltage alternating reactance device one end is connect with high-voltage ac power, and the other end is connect with high-voltage alternating unit；
Described high voltage direct current reactance device one end is connect with high-voltage DC power supply, and the other end is connect with high voltage direct current unit；
The high-voltage alternating unit and high-voltage DC power supply pass through the high frequency transformer isolated location and the low-voltage direct list
Member connection；
The low-voltage direct unit is attempted by the low-voltage direct bus.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258620A (en) * | 2021-06-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Alternating current-direct current power supply system |
| US20230144906A1 (en) * | 2021-11-08 | 2023-05-11 | Pacific Fast Charge Corporation | Modular high power bi-directional half bridge buck/boost converter assembly |
| CN117476402A (en) * | 2023-12-28 | 2024-01-30 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
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2019
- 2019-05-29 CN CN201910454232.7A patent/CN110224581A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258620A (en) * | 2021-06-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Alternating current-direct current power supply system |
| US20230144906A1 (en) * | 2021-11-08 | 2023-05-11 | Pacific Fast Charge Corporation | Modular high power bi-directional half bridge buck/boost converter assembly |
| CN117476402A (en) * | 2023-12-28 | 2024-01-30 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
| CN117476402B (en) * | 2023-12-28 | 2024-03-12 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
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