CN103973121A - Single-phase power electronic transformer - Google Patents
Single-phase power electronic transformer Download PDFInfo
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- CN103973121A CN103973121A CN201410135384.8A CN201410135384A CN103973121A CN 103973121 A CN103973121 A CN 103973121A CN 201410135384 A CN201410135384 A CN 201410135384A CN 103973121 A CN103973121 A CN 103973121A
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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 power technology field, relate in particular to a kind of Monophase electric power electronic transformer.
Background technology
Transformer, since 19th century were invented, has become one of most important component devices of fundamental sum of electric power system, is widely used in distribution system, realizes electric pressure conversion and isolation.But there is shortcomings in traditional transformer: (1) bulky, and along with the raising of electric pressure, the volume and weight of transformer sharply increases; (2) responsive to the quality of power supply, while connecing nonlinear-loads such as not controlling rectification, the distortion current of generation can enter into electrical network by the coupling of transformer, and bus electrical network is polluted, and causes power supply quality to decline; (3) during load side generation ground short circuit fault, traditional transformer is isolated fault effectively, causes fault coverage to expand; (4) need special protective relaying device to protect, when transformer core is saturated, easily produce larger magnetizing inrush current, to electric power system, bring harm; (5) transformer noload losses is larger, easily causes the decline of output voltage during overload; (6) function singleness, does not have the functions such as voltage-regulation, power factor correction and power flow control, cannot meet the demand that intelligent grid is built.
Electric power electric transformer (PET) is the novel electric power transformer progressively growing up along with the development of high-power electric and electronic technology in recent years, and it can overcome the shortcoming of traditional transformer, and utilizes the advantage of electronic power convertor and high frequency transformer.Electric power electric transformer, realizing on the basis of the basic functions such as conventional electric power transformer transformation, isolation and transferring energy, can also be realized Fault Isolation, and the quality of power supply is controlled, the functions such as distributed DC power supply access.
PET is applied to high voltage power distribution occasion, generally uses traditional many level topological structure, but along with the increase of electric pressure and level number, the complexity of required power electronic device and topology all will increase greatly.And modularization multi-level converter (modular multilevelconverter, SM) topology, the brachium pontis of converter is not directly in series by a plurality of switching devices, but has adopted the mode of submodule cascade, is particularly suitable for high pressure applications.And lower bridge arm voltage rate of change (dv/dt) and current changing rate (di/dt) greatly reduce the stress that switching device bears, each harmonic containing ratio and total percent harmonic distortion also reduce greatly, thereby can reduce even to save jumbo alternating current filter.Modular structure also make capacity expand and Redundancy Design more easy.
Electronic power transformer of the prior art generally comprises Cascade H bridge rectifier, isolation level and inverter, and small part has been applied modular multilevel rectifier, but is also only limited to three-phase three bridge arm circuit structures, cannot be applied in single phase system.
Summary of the invention
The object of the present invention is to provide a kind of Monophase electric power electronic transformer that can be applied in single phase system.
In order to achieve the above object, the invention provides Monophase electric power electronic transformer, comprising:
Input stage circuit, intermediate isolating level and DC-AC inverter;
Wherein, described input stage circuit comprises that parallel connection is linked into the first brachium pontis and the second brachium pontis between the positive-negative input end of high voltage dc bus; Described the first brachium pontis comprises two connected electric capacity, and the connecting line between two electric capacity is connected with an input of high-voltage alternating; Described the second brachium pontis comprises the modular multilevel SM of a plurality of series connection, and first brachium pontis is connected with another input of high-voltage alternating with the connecting line between second brachium pontis; Described intermediate isolating level comprises a plurality of DC-DC isolators, and each DC-DC isolator is connected with a SM, and the output parallel connection of a plurality of DC-DC isolators outputs to DC-AC inverter; Described DC-AC inverter is connected with low-voltage alternating-current output.
Preferably, described DC-DC isolator is two-way full-bridge converter DAB.
Preferably, first brachium pontis of described the second brachium pontis and described second brachium pontis all also comprise a current limiting reactor, and one end of described current-limiting impedance device is connected with the input of high-voltage alternating, and the other end is connected with the SM of series connection.
Preferably, described DC-DC isolator comprises inverter, intermediate frequency transformer and rectifier, and the DC side of described inverter is connected with the DC output end of described SM, and AC connects the former side of described intermediate frequency transformer; The AC of described rectifier connects the pair side of described intermediate frequency transformer, and the DC side of described rectifier is connected with described DC-AC inverter.
Preferably, described SM and coupled inverter share an electric capacity.
Preferably, described rectifier and output stage share an electric capacity.
In Monophase electric power electronic transformer provided by the invention, between the positive-negative input end of high voltage dc bus, be also connected with the first brachium pontis, described the first brachium pontis comprises two connected electric capacity, and the connecting line between two electric capacity is connected with an input of high-voltage alternating, make like this input stage integral body form single-phase semi-bridge rectification circuit, be applicable to high-voltage one-phase commutation system.Simultaneously, electric power electric transformer provided by the invention possesses alternating current-direct current and sneaks into input interface, can adapt to independent interchange or direct-flow distribution system, also can be adapted to alternating current-direct current and mix distribution system, realize transformation isolation and power delivery function between multi-form and electric pressure electrical network.
Accompanying drawing explanation
The structural representation of a kind of Monophase electric power electronic transformer that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the structural representation of a kind of preferred SM in Monophase electric power electronic transformer provided by the invention;
Fig. 3 is the structural representation of a kind of preferred DC-DC isolator in Monophase electric power electronic transformer provided by the invention;
Fig. 4 is the another kind of structural representation of a kind of Monophase electric power electronic transformer provided by the invention;
Control principle drawing to SM in the control method of Fig. 5 a kind of Monophase electric power electronic transformer provided by the invention;
Fundamental diagram to interior ring controller in SM control procedure in the control method of Fig. 6 a kind of Monophase electric power electronic transformer provided by the invention;
Schematic diagram to DC voltage control in SM control procedure in the control method of Fig. 7 a kind of Monophase electric power electronic transformer provided by the invention;
Control principle drawing to intermediate isolating level in the control method of Fig. 8 a kind of Monophase electric power electronic transformer provided by the invention;
Control principle drawing to output stage in the control method of Fig. 9 a kind of Monophase electric power electronic transformer provided by the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Embodiment mono-
The embodiment of the present invention one provides a kind of Monophase electric power electronic transformer, as shown in Figure 1, comprising:
Input stage circuit, intermediate isolating level and DC-AC inverter 300;
Wherein, input stage circuit comprises that parallel connection is linked into the first brachium pontis and the second brachium pontis between the positive-negative input end of high voltage dc bus; Described the first brachium pontis comprises two connected electric capacity 111 and 112, and the connecting line between two electric capacity is connected with an input of high-voltage alternating; The second brachium pontis comprises the modular multilevel SM(120 of a plurality of series connection), and first brachium pontis is connected with another input of high-voltage alternating with the connecting line between second brachium pontis; Intermediate isolating level comprises a plurality of DC-DC isolators 200, and each DC-DC isolator 200 is connected with a SM120, and the output parallel connection of a plurality of DC-DC isolators 200 outputs to DC-AC inverter 300; DC-AC inverter 300 is connected with low-voltage alternating-current output.
In Monophase electric power electronic transformer provided by the invention, between the positive-negative input end of high voltage dc bus, be also connected with the first brachium pontis, described the first brachium pontis comprises two connected electric capacity, and the connecting line between two electric capacity is connected with an input of high-voltage alternating, make like this input stage integral body form single-phase semi-bridge rectification circuit, be applicable to high-voltage one-phase commutation system.Simultaneously, electric power electric transformer provided by the invention possesses alternating current-direct current and sneaks into input interface, can adapt to independent interchange or direct-flow distribution system, also can be adapted to alternating current-direct current and mix distribution system, realize transformation isolation and power delivery function between multi-form and electric pressure electrical network.
In practical application, first brachium pontis of described the second brachium pontis and second brachium pontis should comprise the SM that quantity is equal, and the structure of each SM is consistent, and the capacity of two electric capacity of other the first brachium pontis is identical.
As shown in Figure 2, structural representation for a kind of preferred SM in Monophase electric power electronic transformer provided by the invention, the power device 121 and 122 that comprises two series connection, an and DC energy storage electric capacity 123, each power device comprises an insulated gate bipolar transistor and a fly-wheel diode, and the insulated gate bipolar transistor of each power device becomes H bridge construction to be connected with fly-wheel diode.
Be illustrated in figure 3 the structural representation of a kind of preferred DC-DC isolator in Monophase electric power electronic transformer provided by the invention, comprise inverter 230, intermediate frequency transformer 240 and rectifier 250, the DC side parallel of described inverter 230 has described the second electric capacity 220, the DC side of described inverter 230 is connected with the DC output end of described modular multilevel SM120, the AC of described inverter 230 connects the former side of described intermediate frequency transformer 240, the AC of described rectifier 250 connects the pair side of described intermediate frequency transformer 240, the DC side parallel of described rectifier 250 has described the first electric capacity 210, the DC side of described rectifier 250 connects described low-voltage direct electrical network.
As shown in Figure 3, in a preferred embodiment, inverter 230 comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
Preferably, described DC-DC isolator is two-way full-bridge converter DAB.As shown in Figure 3, in an embodiment, rectifier 250 comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
As shown in Figure 1, first brachium pontis of the second brachium pontis 110 and described second brachium pontis all also comprise a current limiting reactor 122, and 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 bis-
The difference of the embodiment of the present invention and embodiment mono-is, the SM in input stage and coupled inverter share an electric capacity.
Embodiment tri-
The embodiment of the present invention and embodiment mono-or twos' difference is, the rectifier of intermediate isolating level and DC-AC inverter share an electric capacity.
The electronic power transformer that Fig. 4 provides shows the situation that SM in input stage and coupled inverter share an electric capacity and intermediate isolating level and the shared electric capacity of DC-AC inverter.
Its specific implementation process is:
(1) input stage
As shown in Figure 5, it is comprised of links such as interior circular current controller, outer shroud direct current voltage regulator, Phase-Locked Synchronous link and trigger impulse generations input stage SM control system structure.Interior circular current controller is realized the direct control of converter ac-side current waveform and phase place, with quick track reference electric current.Outer shroud DC voltage control is according to the system-level control realization of goal of SM constant DC voltage control.The phase signal of phase-locked link output is for providing the directed control of voltage vector and trigger impulse to generate required reference phase.
Interior circular current controller adopts to be realized PI comparatively easily and controls, and considers in the Mathematical Modeling of SM and has coupling between d, q axle variable, also has in addition u
d, u
qdisturbing signal, considers to adopt Feedforward Decoupling strategy, introduces voltage compensating for coupling item ω Li
d, ω Li
qand ac grid voltage feedforward term u
d, u
q, interior ring controller as shown in Figure 6.
In figure, current controller output variable v
dref, v
qrefd axle and the q axle component of the sinusoidal reference fundamental voltage of the corresponding SM desired output of difference.Current reference value i in figure
dref, i
qrefcan obtain from outer ring controller output, interior circular current is controlled and is adopted current feedback and voltage feed-forward control, has improved the tracking response characteristic of current controller, has eliminated again the steady-state error of current tracking simultaneously by pi regulator.
Outer shroud direct current voltage regulator is according to controlling requirement, and circular current reference value in generating, realizes DC voltage control.Fig. 7 has provided the DC voltage controller using, and the comparison of direct voltage and set point thereof and PI link are used for making direct voltage U
dcfollow the tracks of its reference value U
dcref.DC voltage control is by regulating AC system to be input to the electric energy of submodule DC energy storage electric capacity, thereby maintains certain direct voltage.So, also introduced submodule capacitance voltage balance and controlled, realize the balance charge/discharge of N submodule in each brachium pontis, reach the in a basic balance of capacitance voltage.
(2) intermediate isolating level
DAB is used phase shifting control to make low-pressure side direct voltage reach designated value, as shown in Figure 8.First, compare low-pressure side direct voltage and set reference value, obtain their difference, by PI controller, according to voltage difference, regulate phase shifting angle again, thereby reach the object of controlling low-pressure side direct voltage, when imbalance occurs high-pressure side system, low-pressure side system still can maintain original poised state.
(3) output stage
Single-phase full-bridge inverter is used two closed-loop controls of ring output voltage outer ring in inductive current, realizes the constant frequency and constant voltage of output, and control block diagram as shown in Figure 9.With reference to value vref, compare with output voltage, error signal is circular current reference value in the output of voltage pi regulator, then current reference value is compared with inductive current, errors signal is through electric current loop pi regulator, output modulating wave, carries out SPWM modulation, produces pulsed drive.In inductive current, ring can suppress load disturbance impact fast, obtains good system dynamic response performance.Outer voltage can be improved output voltage waveforms, improves output accuracy.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a Monophase electric power electronic transformer, is characterized in that, comprising: input stage circuit, intermediate isolating level and DC-AC inverter;
Wherein, described input stage circuit comprises that parallel connection is linked into the first brachium pontis and the second brachium pontis between the positive-negative input end of high voltage dc bus; Described the first brachium pontis comprises two connected electric capacity, and the connecting line between two electric capacity is connected with an input of high-voltage alternating; Described the second brachium pontis comprises the modular multilevel submodule SM of a plurality of series connection, and first brachium pontis is connected with another input of high-voltage alternating with the connecting line between second brachium pontis; Described intermediate isolating level comprises a plurality of DC-DC isolators, and each DC-DC isolator is connected with a SM, and the output parallel connection of a plurality of DC-DC isolators outputs to DC-AC inverter; Described DC-AC inverter is connected with low-voltage alternating-current output.
2. transformer as claimed in claim 1, is characterized in that, described DC-DC isolator is two-way full-bridge converter DAB.
3. transformer as claimed in claim 1, it is characterized in that, first brachium pontis of described the second brachium pontis and described second brachium pontis all also comprise a current limiting reactor, and one end of described current-limiting impedance device is connected with the input of high-voltage alternating, and the other end is connected with the SM of series connection.
4. transformer as claimed in claim 1, is characterized in that, described DC-DC isolator comprises inverter, intermediate frequency transformer and rectifier, and the DC side of described inverter is connected with the DC output end of described SM, and AC connects the former side of described intermediate frequency transformer; The AC of described rectifier connects the pair side of described intermediate frequency transformer, and the DC side of described rectifier is connected with described DC-AC inverter.
5. transformer as claimed in claim 4, is characterized in that, the coupled inverter of described modular multilevel submodule SM shares an electric capacity.
6. transformer as claimed in claim 4, is characterized in that, described rectifier and output stage share an electric capacity.
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| CN201410135384.8A CN103973121B (en) | 2014-04-04 | 2014-04-04 | single-phase power electronic transformer |
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| CN201410135384.8A CN103973121B (en) | 2014-04-04 | 2014-04-04 | single-phase power electronic transformer |
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| CN104143775A (en) * | 2014-08-18 | 2014-11-12 | 国家电网公司 | Power electronic transformer substation |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module 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 |
| CN105553304A (en) * | 2016-01-15 | 2016-05-04 | 湖南大学 | Novel modular multi-level solid-state transformer and internal model control method thereof |
| 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 |
| CN109104076A (en) * | 2017-06-21 | 2018-12-28 | 张东胜 | A kind of electronic potential device |
| CN110112918A (en) * | 2019-04-18 | 2019-08-09 | 国网江苏省电力有限公司 | A kind of how active bridge control method based on primary side phase shifting angle |
| CN110504718A (en) * | 2018-05-18 | 2019-11-26 | 中国石油化工股份有限公司 | A kind of charge-discharge controller and method |
| CN110943634A (en) * | 2018-09-25 | 2020-03-31 | 中国电力科学研究院有限公司 | Energy type router and soft charging control method and system thereof |
| CN110995030A (en) * | 2019-12-02 | 2020-04-10 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| CN104143775B (en) * | 2014-08-18 | 2016-04-20 | 国家电网公司 | A kind of power electronic transformer substation |
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| 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 |
| CN105553304A (en) * | 2016-01-15 | 2016-05-04 | 湖南大学 | Novel modular multi-level solid-state transformer and internal model control method thereof |
| 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 |
| CN109104076A (en) * | 2017-06-21 | 2018-12-28 | 张东胜 | A kind of electronic potential device |
| CN110504718A (en) * | 2018-05-18 | 2019-11-26 | 中国石油化工股份有限公司 | A kind of charge-discharge controller and method |
| 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 |
| CN110943634A (en) * | 2018-09-25 | 2020-03-31 | 中国电力科学研究院有限公司 | Energy type router and soft charging control method and system thereof |
| 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 |
| CN110112918A (en) * | 2019-04-18 | 2019-08-09 | 国网江苏省电力有限公司 | A kind of how active bridge control method based on primary side phase shifting angle |
| CN110995030A (en) * | 2019-12-02 | 2020-04-10 | 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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