CN103973121B - single-phase power electronic transformer - Google Patents
single-phase power electronic transformer Download PDFInfo
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- CN103973121B CN103973121B CN201410135384.8A CN201410135384A CN103973121B CN 103973121 B CN103973121 B CN 103973121B CN 201410135384 A CN201410135384 A CN 201410135384A CN 103973121 B CN103973121 B CN 103973121B
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Abstract
The invention provides a single-phase power electronic transformer. The single-phase power electronic transformer comprises an input-stage circuit, a middle isolating-stage circuit and a DC-AC (direct current-alternating current) inverter, wherein the input-stage circuit comprises a first bridge arm and a second bridge arm; the first bridge arm and the second bridge arm are connected between a positive input end and a negative input end of a high-voltage direct-current bus; the first bridge arm comprises two capacitors which are connected with each other; a connecting line between the two capacitors is connected with an input end of a high-voltage alternating-current bus; an upper half bridge arm and a lower half bridge arm of the second bridge arm comprise a plurality of modular multi-level SM (signal modules); and a connecting line between the upper half bridge arm and the lower half bridge arm is connected with another input end of the high-voltage alternating-current bus. A single-phase half-bridge rectifying circuit is formed by the whole input-stage circuit. The single-phase power electronic transformer is suitable for a high-voltage single-phase rectifier system. Moreover, the power electronic transformer is provided with an alternating-current and direct-current mixed input interface, not only is suitable for an independent alternating-current or direct-current power distribution system, but also is suitable for an alternating-current and direct-current mixed power distribution system. Functions of transformation isolation and power transmission between power grids with different types and voltage classes can be fulfilled.
Description
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of Monophase electric power electronic transformer.
Background technology
Transformator from 19th century by invention since, it has also become one of most basic and most important component devices of power system,
It is widely used in distribution system, realizes electric pressure conversion and isolate.But there are shortcomings in traditional transformer：（1）Volume
It is huge, and with the raising of electric pressure, the volume and weight of transformator is sharply increased；（2）It is sensitive to the quality of power supply, connect and do not control
During the nonlinear-loads such as rectification, the distortion current of generation can be entered into by the coupling of transformator in electrical network, make bus
Electrical network is contaminated, and causes power supply quality to decline；（3）When load side occurs ground short circuit failure, traditional transformer can not be effective
Ground isolated fault, causes fault coverage to expand；（4）Special protective relaying device is needed to be protected, transformer core saturation
When, larger excitation surge current is easily produced, and harm is brought to power system；（5）Transformer noload losses is larger, holds during overload
Easily cause the decline of output voltage；（6）The work(such as single function, the control of no voltage-regulation, PFC and power flow
Can, it is impossible to meet the demand of intelligent grid construction.
Electric power electric transformer（PET）It is progressively to grow up recently as the development of high-power electric and electronic technology
Novel electric power transformator, it can overcome the shortcoming of traditional transformer, and using electronic power convertor and high frequency transformer
Advantage.Electric power electric transformer on the basis of realizing traditional power transformer transformation, isolation and transmitting the basic function such as energy,
The functions such as Fault Isolation, utility power quality control, distributed DC power access can also be realized.
PET is applied to high voltage power distribution occasion, generally uses traditional many level topological structure, but with electric pressure and electricity
The complexity for equalling the increase of number, required power electronic devices and topology will all be greatly increased.And modular multilevel is changed
Stream device (modular multilevel converter, SM) topology, the bridge arm of inverter is not direct by multiple switch device
It is in series, but the mode of sub-module cascade is employed, it is particularly suitable for high pressure applications.And relatively low bridge arm voltage becomes
Rate (dv/dt) and current changing rate (di/dt) cause the stress that switching device bears to be greatly lowered, each harmonic containing ratio and
Total harmonic distortion factor is greatly reduced, such that it is able to reduce or even save jumbo alternating current filter.Modular structure
So that capacity is expanded and Redundancy Design is more easy.
Electronic power transformer of the prior art generally comprises cascaded H-bridges commutator, isolation level and inverter, small part
Modular multilevel commutator is applied, but is also only limited to three bridge arm circuit structure of three-phase, it is impossible to be applied in monophase system.
The content of the invention
It is an object of the invention to provide a kind of Monophase electric power electronic transformer that can be applied in monophase system.
In order to achieve the above object, the invention provides Monophase electric power electronic transformer, including：
Input stage circuit, intermediate isolating level and DC-AC inverter；
Wherein, the input stage circuit includes the first bridge being coupled in parallel between the positive-negative input end of high voltage dc bus
Arm and the second bridge arm；First bridge arm includes connecting line and high-voltage alternating between two connected electric capacity, and two electric capacity
An input be connected；Second bridge arm includes the modular multilevel SM of multiple series connection, and upper half bridge arm and lower half-bridge
Connecting line between arm is connected with another input of high-voltage alternating；The intermediate isolating level includes multiple DC-DC isolators,
Each DC-DC isolator is connected with a SM, and the outfan Parallel opertation of multiple DC-DC isolators is to DC-AC inverter；Institute
State DC-AC inverter to be connected with low-voltage alternating-current outfan.
Preferably, the DC-DC isolators are two-way full-bridge converter DAB.
Preferably, the upper half bridge arm of second bridge arm and the lower half bridge arm also include a current-limiting reactor, institute
State one end of current-limiting impedance device to be connected with the input of high-voltage alternating, the other end is connected with the SM of series connection.
Preferably, the DC-DC isolators include inverter, intermediate-frequency transformer and commutator, the direct current of the inverter
Side is connected with the DC output end of the SM, and AC connects the original side of the intermediate-frequency transformer；The AC of the commutator
Connect the assistant formula of the intermediate-frequency transformer, the DC side of the commutator is connected with the DC-AC inverter.
Preferably, the SM shares an electric capacity with coupled inverter.
Preferably, the commutator shares an electric capacity with output stage.
In the Monophase electric power electronic transformer that the present invention is provided, it is also associated between the positive-negative input end of high voltage dc bus
First bridge arm, first bridge arm include the one of the connecting line between two connected electric capacity, and two electric capacity and high-voltage alternating
Individual input is connected, and so makes input stage that single-phase semi-bridge rectification circuit has been integrally formed, it is adaptable to high-voltage one-phase commutation system.Together
When, the electric power electric transformer that the present invention is provided possesses alternating current-direct current and is mixed into input interface, has both adapted to single AC or DC
Distribution system, also adapts to mix distribution system in alternating current-direct current, realizes the transformation isolation between multi-form and electric pressure electrical network
And power transmission function.
Description of the drawings
Fig. 1 is a kind of structural representation of Monophase electric power electronic transformer provided in an embodiment of the present invention；
A kind of structural representation of preferred SM in the Monophase electric power electronic transformer that Fig. 2 is provided for the present invention；
A kind of structural representation of preferred DC-DC isolators in the Monophase electric power electronic transformer that Fig. 3 is provided for the present invention
Figure；
A kind of another kind of structural representation of Monophase electric power electronic transformer that Fig. 4 is provided for the present invention；
Control principle drawing in a kind of control method of Monophase electric power electronic transformer that Fig. 5 present invention is provided to SM；
To internal ring control in SM control process in a kind of control method of Monophase electric power electronic transformer that Fig. 6 present invention is provided
The fundamental diagram of device processed；
To unidirectional current in SM control process in a kind of control method of Monophase electric power electronic transformer that Fig. 7 present invention is provided
The schematic diagram of voltage-controlled system；
It is former to the control of intermediate isolating level in a kind of control method of Monophase electric power electronic transformer that Fig. 8 present invention is provided
Reason figure；
Control principle in a kind of control method of Monophase electric power electronic transformer that Fig. 9 present invention is provided to output stage
Figure.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is further described.Following examples are only
For clearly illustrating technical scheme, and can not be limited the scope of the invention with this.
Embodiment one
The embodiment of the present invention one provides a kind of Monophase electric power electronic transformer, as shown in figure 1, including：
Input stage circuit, intermediate isolating level and DC-AC inverter 300；
Wherein, input stage circuit include the first bridge arm for being coupled in parallel between the positive-negative input end of high voltage dc bus and
Second bridge arm；First bridge arm includes two connected electric capacity 111 and 112, and the connecting line and high pressure between two electric capacity
One input of exchange is connected；Second bridge arm includes the modular multilevel SM of multiple series connection（120）, and upper half bridge arm is with
Connecting line between half bridge arm is connected with another input of high-voltage alternating；Intermediate isolating level includes multiple DC-DC isolators
200, each DC-DC isolator 200 is connected with a SM120, and the outfan Parallel opertation of multiple DC-DC isolators 200 is arrived
DC-AC inverter 300；DC-AC inverter 300 is connected with low-voltage alternating-current outfan.
In the Monophase electric power electronic transformer that the present invention is provided, it is also associated between the positive-negative input end of high voltage dc bus
First bridge arm, first bridge arm include the one of the connecting line between two connected electric capacity, and two electric capacity and high-voltage alternating
Individual input is connected, and so makes input stage that single-phase semi-bridge rectification circuit has been integrally formed, it is adaptable to high-voltage one-phase commutation system.Together
When, the electric power electric transformer that the present invention is provided possesses alternating current-direct current and is mixed into input interface, has both adapted to single AC or DC
Distribution system, also adapts to mix distribution system in alternating current-direct current, realizes the transformation isolation between multi-form and electric pressure electrical network
And power transmission function.
In practical application, the upper half bridge arm and lower half bridge arm of second bridge arm should include the equal SM of quantity, and each
The structure of SM is consistent, and the capacity of the two of the first bridge arm electric capacity is identical in addition.
As shown in Fig. 2 a kind of structural representation of preferred SM in the Monophase electric power electronic transformer provided for the present invention,
Including the power devices 121 and 122 of two series connection, an and DC energy storage electric capacity 123, each power device include one absolutely
Edge grid bipolar transistor and a fly-wheel diode, and two pole of insulated gate bipolar transistor and afterflow of each power device
Pipe connects into H bridge constructions.
A kind of knot of preferred DC-DC isolators in the Monophase electric power electronic transformer of present invention offer is provided
Structure schematic diagram, including inverter 230, intermediate-frequency transformer 240 and commutator 250, the DC side parallel of the inverter 230 is
The second electric capacity 220 is stated, the DC side of the inverter 230 is connected with the DC output end of the modular multilevel SM120, institute
The AC for stating inverter 230 connects the original side of the intermediate-frequency transformer 240, and the AC connection of the commutator 250 is described
The assistant formula of intermediate-frequency transformer 240, the DC side parallel of the commutator 250 have first electric capacity 210, the commutator 250
DC side connect the low-voltage direct electrical network.
As shown in figure 3, wherein in a preferred embodiment, inverter 230 includes four groups of insulated gate bipolar crystal
Pipe and fly-wheel diode, four groups of insulated gate bipolar transistors and the fly-wheel diode connect into H bridge constructions.
Preferably, the DC-DC isolators are two-way full-bridge converter DAB.As shown in figure 3, one embodiment wherein
In, commutator 250 includes four groups of insulated gate bipolar transistors and fly-wheel diode, four groups of insulated gate bipolar transistors
Connect into H bridge constructions with the fly-wheel diode.
As shown in figure 1, the upper half bridge arm of the second bridge arm 110 and the lower half bridge arm also include a current-limiting reactor
122, one end of current-limiting impedance device 122 is connected with the input of high-voltage alternating, and the other end is connected with the SM of series connection.
Embodiment two
The embodiment of the present invention is that the SM in input stage is with coupled inverter altogether with the difference of embodiment one
With an electric capacity.
Embodiment three
The embodiment of the present invention is that the commutator of intermediate isolating level is inverse with DC-AC with the difference of embodiment one or two
Become device and share an electric capacity.
The electronic power transformer that Fig. 4 is provided show SM in input stage and coupled inverter share one it is electric
Appearance and intermediate isolating level and DC-AC inverter share the situation of an electric capacity.
Its specific implementation process is：
（1）Input stage
Input stage SM Control system architecture as shown in figure 5, it by internal ring current controller, outer shroud direct current voltage regulator,
The link composition such as Phase-Locked Synchronous link and trigger pulse generation.Internal ring current controller realize inverter ac-side current waveform and
The direct control of phase place, with quick track reference electric current.Outer shroud DC voltage control is then realized according to the system-level control targes of SM
Constant DC voltage control.The phase signal of phaselocked loop section output is used to provide voltage vector oriented control and trigger pulse generates institute
The reference phase for needing.
Internal ring current controller is using realization conveniently PI controls, it is contemplated that d, q axle variable in the mathematical model of SM
Between exist coupling, additionally there are ud、uqDisturbing signal, it is considered to using Feedforward Decoupling strategy, introduces voltage compensating for coupling item ω
Lid、ωLiqAnd ac grid voltage feedforward term ud、uq, interior ring controller is as shown in Figure 6.
In figure, current controller output vdref、vqrefThe d of the sinusoidal reference fundamental voltage of SM desired outputs is corresponded to respectively
Axle and q axle components.Current reference value i in figuredref、iqrefCan obtain from outer ring controller output, internal ring current control is using electricity
Stream feedback and voltage feed-forward control, improve the tracking response characteristic of current controller, while eliminating further through pi regulator
The steady-state error of current tracking.
Outer shroud direct current voltage regulator requires according to control, generates internal ring current reference value, realize DC voltage control.Figure
7 comparisons for giving used DC voltage controller, DC voltage and its setting value and PI links are used for making DC voltage
UdcTrack its reference value Udcref.DC voltage control is to be input to submodule DC energy storage electric capacity by adjusting AC system
Electric energy, so as to maintain certain DC voltage.So, submodule capacitor voltage balance control is also introduced, each bridge arm is realized
In N number of submodule balance charge/discharge, reach the in a basic balance of capacitance voltage.
（2）Intermediate isolating level
DAB makes low-pressure side DC voltage reach designated value using phase shifting control, as shown in Figure 8.First, compare low-pressure side straight
Stream voltage and setting reference value, obtain their difference, then adjust phase shifting angle according to voltage difference by PI controllers, so as to reach
The purpose of control low-pressure side DC voltage, when high-side system occurs uneven, low pressure side system still can remain original
Poised state.
（3）Output stage
Double-closed-loop control of the single-phase full-bridge inverter using inductive current internal ring output voltage outer ring, realizes the constant frequency of output
Constant pressure, control block diagram are as shown in Figure 9.Reference value vref is compared with output voltage, error signal Jing voltage PI regulator is defeated
Go out internal ring current reference value, then current reference value is compared with inductive current, errors signal is adjusted through electric current loop PI
Device, exports modulating wave, carries out SPWM modulation, produces pulsed drive.Inductive current internal ring can quickly suppress load disturbance to affect,
Obtain preferable system dynamics response performance.Outer voltage can improve output voltage waveforms, improve output accuracy.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the technology of the present invention principle, some improvements and modifications can also be made, these improvements and modifications
Also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of Monophase electric power electronic transformer, it is characterised in that include：Input stage circuit, intermediate isolating level and DC-AC inversions
Device；
Wherein, the input stage circuit include the first bridge arm for being coupled in parallel between the positive-negative input end of high voltage dc bus and
Second bridge arm；First bridge arm includes the one of the connecting line between two connected electric capacity, and two electric capacity and high-voltage alternating
Individual input is connected；Second bridge arm includes the modular multilevel submodule SM of multiple series connection, and upper half bridge arm and lower half
Connecting line between bridge arm is connected with another input of high-voltage alternating；The intermediate isolating level includes multiple DC-DC isolation
Device, each DC-DC isolator are connected with a SM, and the outfan Parallel opertation of multiple DC-DC isolators is to DC-AC inversions
Device；The DC-AC inverter is connected with low-voltage alternating-current outfan；
The upper half bridge arm and lower half bridge arm of second bridge arm includes the equal modular multilevel submodule SM of quantity, and each
The structure of modular multilevel submodule SM is identical.
2. transformator as claimed in claim 1, it is characterised in that the DC-DC isolators are two-way full-bridge converter.
3. transformator as claimed in claim 1, it is characterised in that the upper half bridge arm of second bridge arm and the lower half bridge arm
Also include a current-limiting reactor, described one end of current-limiting impedance device is connected with the input of high-voltage alternating, the other end with go here and there
The input of the SM of connection is connected.
4. transformator as claimed in claim 1, it is characterised in that the DC-DC isolators include inverter, intermediate-frequency transformer
And commutator, the DC side of the inverter is connected with the DC output end of the SM, and AC connects the intermediate-frequency transformer
Former limit；The AC of the commutator connects the secondary of the intermediate-frequency transformer, the DC side of the commutator and the DC-
AC inverters are connected.
5. transformator as claimed in claim 4, it is characterised in that coupled inverse of the modular multilevel submodule SM
Become device and share an electric capacity.
6. transformator as claimed in claim 4, it is characterised in that the commutator shares an electric capacity with output stage.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104143775B (en) * | 2014-08-18 | 2016-04-20 | 国家电网公司 | A kind of power electronic transformer substation |
| CN104184356B (en) * | 2014-08-18 | 2017-07-14 | 国家电网公司 | A kind of power model group of three-phase power electronic transformer |
| CN104993505A (en) * | 2015-06-30 | 2015-10-21 | 湘潭大学 | Voltage and power balance control method for modular power electric transformer |
| CN105553304B (en) * | 2016-01-15 | 2018-10-02 | 湖南大学 | A kind of modular multilevel type solid-state transformer and its internal model control method |
| CN105610325A (en) * | 2016-01-28 | 2016-05-25 | 中国电力科学研究院 | Modular multilevel converter for middle-high voltage direct-current grid connection of high-power sodium-sulfur battery |
| CN106300310A (en) * | 2016-08-16 | 2017-01-04 | 河北五良盟合环保技术有限公司 | One has load current limliting constant voltage box type transformer |
| CN109104076B (en) * | 2017-06-21 | 2021-08-10 | 张东胜 | Electronic transformer |
| CN110504718B (en) * | 2018-05-18 | 2021-04-06 | 中国石油化工股份有限公司 | Charging and discharging control device and method |
| CN110943634B (en) * | 2018-09-25 | 2022-12-30 | 中国电力科学研究院有限公司 | Energy type router and soft charging control method and system thereof |
| CN110112918B (en) * | 2019-04-18 | 2021-05-28 | 国网江苏省电力有限公司 | Multi-active-bridge control method based on primary side phase shifting angle |
| CN110995030B (en) * | 2019-12-02 | 2020-12-15 | 上海交通大学 | Solid-state transformer with medium-voltage direct current and true-dual ultra-low-voltage direct current ports |
| CN112953281A (en) * | 2020-12-04 | 2021-06-11 | 武汉海德博创科技有限公司 | Digital frequency conversion and voltage regulation signal source control scheme and system |
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| CN103098329A (en) * | 2010-09-21 | 2013-05-08 | Abb技术有限公司 | An apparatus for controlling the electric power transmission in a HVDC power transmission system |
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| CN202076951U (en) * | 2011-03-03 | 2011-12-14 | 山东大学 | Integrated control system of modular multi-lever converter |
| CN103208929A (en) * | 2013-04-22 | 2013-07-17 | 广东电网公司电力科学研究院 | Electronic power transformer based on multi-media card (MMC) |
| CN203827195U (en) * | 2014-04-04 | 2014-09-10 | 广西电网公司电力科学研究院 | Single phase power electronic transformer |
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