CN102832815A - Three-phase electric and electronic transformer based on multi-level multi-module cascade structure - Google Patents
Three-phase electric and electronic transformer based on multi-level multi-module cascade structure Download PDFInfo
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Abstract
The invention discloses a three-phase electric and electronic transformer based on a multi-level multi-module cascade structure. The three-phase electric and electronic transformer has three levels, i.e. an input level, an isolation level and an output level. An output end of an input-level power converter is connected with an input end of a high-frequency DC/AC (direct current/alternating current) link power converter; an output end of the high-frequency DC/AC link power converter is connected with the primary side of a high-frequency transformer; the secondary side of the high-frequency transformer is connected with the input end of the high-frequency DC/AC link power converter; the output end of the high-frequency DC/AC link power converter is connected with an input end of an output-level power converter; an output end of the output-level power converter is connected with an input end of an LC wave filter; and the LC wave filter is connected with a three-phase power supply network. Basic functions, such as transformation, isolation and energy transfer of the traditional electric transformer can be realized, and for the input voltage with different levels, corresponding voltage can be born only by calculating the corresponding number of input-level serial modules and serial connection according to corresponding module number.
Description
Technical field
The invention belongs to the electric power electric transformer technical field, relate to three-phase power electronic transformer based on multistage multi-module cascade structure.
Background technology
In electric power system, the conventional electric power transformer that mainly plays transformation and buffer action is widely used.On the one hand, the conventional electric power transformer has the efficient height, cost is low, reliability is high, advantages of simple structure and simple; On the other hand, it also has significant disadvantages, and is heavy, volume is big, no-load loss is big, and function singleness uses transformer oil that environment structure is threatened, and distortion current can pollute electrical network during the band nonlinear load, and electrical network can influence load or the like again when fluctuation is arranged.Along with power system development; Especially the development of distributed generation system and new forms of energy; Press for a kind of new device for converting electric energy and except realizing electrical isolation and transformation function, can also realize load-side pressure regulation, Active PFC, the inhibition of input and output both sides harmonic wave or the like function, volume is little, in light weight simultaneously, no-load loss is little.Obviously, the conventional electric power transformer can't satisfy these application requirements.
Along with the development of power electronic technology, the notion of electric power electric transformer (PET-Power electronic transformer) or solid-state transformer (SST-Solid-state transformer) is suggested with solving the insurmountable problem of these conventional electric power transformers.PET has experienced desultory development in 40 years after being suggested the beginning of the seventies in last century, many topologys are suggested.These topologys can be divided into single step arrangement, two-layer configuration and tertiary structure from the progression angle of cascade; Can be divided into based on full bridge structure with based on two types on diode clamp or striding capacitance structure from the modularization angle.See that from the progression angle of cascade the progression of cascade is many more, the function that PET can realize is just many more, thereby now mainly based on tertiary structure; See, than based on diode clamp or striding capacitance structure bigger advantage is arranged from the modularization angle, thereby also be the main flow of studying now based on full bridge structure for high-power high voltage voltage application scenario.
At present, because existing power electronic device cost comparatively speaking than higher, wants high a lot of with respect to the conventional electric power transformer on the overall cost of electric power electric transformer.Along with power electronic device level and high frequency transformer Development of Materials, electric power electric transformer will progressively substitute the position of conventional electric power transformer in electric power system.
Summary of the invention
The problem that the present invention solves is to provide a kind of three-phase power electronic transformer based on multistage multi-module cascade structure, not only can realize the function of traditional transformer voltage transformation, electrical isolation and energy bi-directional, and is convenient to produce, debugs and safeguards.
The present invention realizes through following technical scheme:
First kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity between two outputs of each input stage power inverter; Whenever the total AC side of input stage power inverter that is in series is connected with reactor, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter of high frequency transformer connection and the power inverter of high-frequency AC/DC link; Each high frequency DC/AC link power inverter of every phase connects one to one with the corresponding input stage power inverter mutually of input stage;
In the three-phase of output stage; The power inverter of the output-stage power converter of every phase and high-frequency AC/DC link connects one to one; Be parallel with output stage dc energy storage electric capacity between two inputs of each the output-stage power converter in N, AC side is connected with the LC filter;
Accumulate a phase, b phase and c respectively mutually after the parallel connection behind the output connection LC of the output-stage power converter of each phase, another output of all output-stage power converters comes together in the n point.
The power inverter and the output-stage power converter of described input stage power inverter, high frequency DC/AC link power inverter, high-frequency AC/DC link all adopt full-control type single-phase full bridge power inverter.
Described input stage power inverter output is connected with the input of high frequency DC/AC link power inverter;
The former limit of the output termination high frequency transformer of high frequency DC/AC link power inverter, the secondary of high frequency transformer connects the input of the power inverter of high-frequency AC/DC link;
The output of the power inverter of high-frequency AC/DC link is connected with the input of output-stage power converter; The output of output-stage power converter connects the input of LC filter, and the LC filter connects the three phase supply network.
Second kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity between two outputs of each input stage power inverter; Whenever the total AC side of input stage power inverter that is in series is connected with reactor, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter of high frequency transformer connection and the power inverter of high-frequency AC/DC link; Each high frequency DC/AC link power inverter of every phase connects one to one with the corresponding input stage power inverter mutually of input stage;
In the three-phase of output stage; The power inverter of the output-stage power converter of every phase and high-frequency AC/DC link connects one to one; Be parallel with output stage dc energy storage electric capacity between two inputs of each the output-stage power converter in N; Three outputs of the output-stage power converter of each phase all connect the LC filter, accumulate a phase, b phase, c phase through the parallel connection of LC filter.
The power inverter of described input stage power inverter, high frequency DC/AC link power inverter and high-frequency AC/DC link all adopts full-control type single-phase full bridge power inverter; Output-stage power converter using full-control type three-phase three brachium pontis power inverters.
The third is based on the three-phase power electronic transformer of multistage multi-module cascade structure, and its topological structure comprises input stage, isolation level, output stage, and every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity between two outputs of each input stage power inverter; Whenever the total AC side of input stage power inverter that is in series is connected with reactor, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter of high frequency transformer connection and the power inverter of high-frequency AC/DC link; Each high frequency DC/AC link power inverter of every phase connects one to one with the corresponding input stage power inverter mutually of input stage;
Be connected with corresponding output-stage power converter mutually after the power inverter parallel connection of two high-frequency AC/DC link in every isolated level; Be parallel with output stage dc energy storage electric capacity between two inputs of each output-stage power converter; An output of the output-stage power converter of each phase accumulates a phase, b phase, c phase respectively through the parallel connection of LC filter, and another output of all output-stage power converters accumulates the n point.
The power inverter and the output-stage power converter of described input stage power inverter, high frequency DC/AC link power inverter, high-frequency AC/DC link all adopt full-control type single-phase full bridge power inverter.
The 4th kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity between two outputs of each input stage power inverter; Whenever the total AC side of input stage power inverter that is in series is connected with reactor, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter of high frequency transformer connection and the power inverter of high-frequency AC/DC link; Each high frequency DC/AC link power inverter of every phase connects one to one with the corresponding input stage power inverter mutually of input stage;
Be connected with corresponding output-stage power converter mutually after the power inverter parallel connection of two high-frequency AC/DC link in every isolated level; Be parallel with output stage dc energy storage electric capacity between two inputs of each the output-stage power converter in N; Three outputs of the output-stage power converter of each phase all connect the LC filter, accumulate a phase, b phase, c phase through the parallel connection of LC filter.
The power inverter of described input stage power inverter, high frequency DC/AC link power inverter and high-frequency AC/DC link all adopts full-control type single-phase full bridge power inverter; Output-stage power converter using full-control type three-phase three brachium pontis power inverters.
Compared with prior art, the three-phase power electronic transformer based on multistage multi-module cascade structure provided by the invention has following beneficial technical effects:
1, can realize transformation, isolation, NE BY ENERGY TRANSFER or the like the basic function of conventional electric power transformer;
2, input stage adopts the tandem modularized power inverter of three-phase structure, in the face of the input voltage of different brackets, only needs to calculate corresponding serial module structure number, joins according to the respective modules string and just can bear corresponding voltage;
3, the whole modularization of the present invention is convenient to produce, debugging and safeguarding;
4, the present invention can realize the isolation of load and electric power system, to load protective effect is provided, and can improve the electrical network quality of power supply and operational reliability as required for grid side provides reactive power compensation or active power filtering function;
5, the present invention can regulate the supply power voltage of output stage, the amplitude and the phase place of electric current automatically, solves that line voltage falls temporarily, power quality problems such as liter, fluctuation and flickering temporarily;
6, a part of topology among the present invention can be handled asymmetric load preferably;
7, DC side of the present invention can insert new energy resources system such as solar energy, wind energy;
8, four kinds of topological structures of the present invention can and be controlled order ground and flexible Application according to the different power grade.
Description of drawings
Fig. 1 is based on one of topological overall structure block diagram of the three-phase power electronic transformer of multistage multi-module cascade structure;
Fig. 2 is based on two of the topological overall structure block diagram of the three-phase power electronic transformer of multistage multi-module cascade structure;
Fig. 3 is based on three of the topological overall structure block diagram of the three-phase power electronic transformer of multistage multi-module cascade structure;
Fig. 4 is based on four of the topological overall structure block diagram of the three-phase power electronic transformer of multistage multi-module cascade structure;
Fig. 5 is the circuit structure diagram of full-bridge power converter unit;
Fig. 6 is the circuit structure diagram of full-control type three-phase three brachium pontis power inverters.
Wherein, 1 is that reactor, 2 is that input stage power inverter, 3 is that input stage dc energy storage electric capacity, 4 is that high frequency DC/AC link power inverter, 5 is that high frequency transformer, 6 is that high-frequency AC/DC link power inverter, 7 is that output stage dc energy storage electric capacity, 8 is that output-stage power converter, 9 is the LC filter;
11 is that first input end, 12 is that second input, 13 is that first output, 14 is second output;
21 is that first input end, 22 is that second input, 23 is that first output, 24 is second output; 25 is the 3rd output.
Embodiment
Three-phase power electronic transformer based on multistage multi-module cascade structure provided by the invention adopts high-pressure side series connection, the parallelly connected technical scheme of low-pressure side, and three-phase structure is identical and independent.Four kinds of all topological overall structures are divided into three grades: input stage, isolation level and output stage.Below in conjunction with concrete embodiment and accompanying drawing the present invention is done further detailed description, said is to explanation of the present invention rather than qualification.
The three-phase power electronic transformer series topology that the present invention is based on multistage multi-module cascade structure adopts the technical scheme of high-pressure side series connection, low-pressure side parallel connection; Three-phase structure is identical and independent; Wherein first kind of topology is as shown in Figure 1, and second kind of topology is as shown in Figure 2, and the third topology is as shown in Figure 3; The 4th kind of topology is as shown in Figure 4; The power inverter physical circuit of four kinds of inner each Sub1 types of topology is as shown in Figure 5, and the power inverter physical circuit of Sub2 type is as shown in Figure 6, and all four kinds of topological overall structures are divided into three grades: input stage, isolation level and output stage.
Referring to Fig. 1, a kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter 2 that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity 3 between two outputs of each input stage power inverter 2; Whenever the total AC side of input stage power inverter that is in series is connected with reactor 1, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter 4 of high frequency transformer 5 connections and the power inverter 6 of high-frequency AC/DC link; Each high frequency DC/AC link power inverter 4 of every phase connects one to one with the corresponding input stage power inverter 2 mutually of input stage;
In the three-phase of output stage; The output-stage power converter 8 of every phase connects one to one with the power inverter 6 of high-frequency AC/DC link; Be parallel with output stage dc energy storage electric capacity (7) between two inputs of each the output-stage power converter 8 in N, AC side is connected with LC filter 9;
An output of the output-stage power converter 8 of each phase accumulates a phase, b phase and c respectively mutually after connecting the 9 back parallel connections of LC filter, and another output of all output-stage power converters 8 comes together in the n point.
Concrete, the power inverter 6 and the output-stage power converter 8 of described input stage power inverter 2, high frequency DC/AC link power inverter 4, high-frequency AC/DC link all adopt full-control type single-phase full bridge power inverter.
Described input stage power inverter 2 outputs are connected with the input of high frequency DC/AC link power inverter 4;
The former limit of the output termination high frequency transformer 5 of high frequency DC/AC link power inverter 4, the secondary of high frequency transformer 5 connects the input of the power inverter 6 of high-frequency AC/DC link;
The output of the power inverter 6 of high-frequency AC/DC link is connected with the input of output-stage power converter 8; The output of output-stage power converter 8 connects the input of LC filter 9, and LC filter 9 connects the three phase supply network.
Referring to Fig. 2, second kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter 2 that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity 3 between two outputs of each input stage power inverter 2; Whenever the total AC side of input stage power inverter that is in series is connected with reactor 1, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter 4 of high frequency transformer 5 connections and the power inverter 6 of high-frequency AC/DC link; Each high frequency DC/AC link power inverter 4 of every phase connects one to one with the corresponding input stage power inverter 2 mutually of input stage;
In the three-phase of output stage; The output-stage power converter 8 of every phase connects one to one with the power inverter 5 of high-frequency AC/DC link; Be parallel with output stage dc energy storage electric capacity 7 between two inputs of each the output-stage power converter 8 in N; Three outputs of the output-stage power converter 8 of each phase all connect LC filter 9, accumulate a phase, b phase, c phase through 9 parallel connections of LC filter.
Concrete, the power inverter 6 of input stage power inverter 2, high frequency DC/AC link power inverter 4 and high-frequency AC/DC link all adopts full-control type single-phase full bridge power inverter (Sub1); Output-stage power converter 8 adopts control type three-phase three brachium pontis power inverters (Sub2).
Referring to Fig. 3, the third is based on the three-phase power electronic transformer of multistage multi-module cascade structure, and its topological structure comprises input stage, isolation level, output stage, and every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter 2 that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity 3 between two outputs of each input stage power inverter 2; Whenever the total AC side of input stage power inverter that is in series is connected with reactor 1, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter 4 of high frequency transformer 5 connections and the power inverter 6 of high-frequency AC/DC link; Each high frequency DC/AC link power inverter 4 of every phase connects one to one with the corresponding input stage power inverter 2 mutually of input stage;
The power inverter 6 parallel connection backs of two high-frequency AC/DC link in every isolated level are connected with corresponding output-stage power converter 8 mutually; Be parallel with output stage dc energy storage electric capacity 7 between two inputs of each output-stage power converter 8; An output of the output-stage power converter 8 of each phase accumulates a phase, b phase, c phase respectively through the parallel connection of LC filter, and another output of all output-stage power converters 8 accumulates the n point.
Referring to Fig. 4, the 4th kind of three-phase power electronic transformer based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter 2 that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity 3 between two outputs of each input stage power inverter 2; Whenever the total AC side of input stage power inverter that is in series is connected with reactor 1, is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter 4 of high frequency transformer 5 connections and the power inverter 6 of high-frequency AC/DC link; Each high frequency DC/AC link power inverter 4 of every phase connects one to one with the corresponding input stage power inverter 2 mutually of input stage;
The power inverter 6 parallel connection backs of two high-frequency AC/DC link in every isolated level are connected with corresponding output-stage power converter 8 mutually; Be parallel with output stage dc energy storage electric capacity 7 between two inputs of each the output-stage power converter 8 in N; Three outputs of the output-stage power converter 8 of each phase all connect LC filter 9, accumulate a phase, b phase, c phase through 9 parallel connections of LC filter.
The connected mode of input stage, isolation level is identical in four kinds of topological structures, and its difference is that the number of multistage multimode can have any different and change, and the variation of output stage is 1) dissimilar power inverters; Wherein first, the third adopts Sub1, second, the 4th kind adopt Sub2; 2) the power inverter difference causes the variation that output stage connects.
Concrete; Input stage is in series by many groups power inverter; The series connection number determines that by input voltage grade and the power electronic device level of being selected for use (as: input voltage is 11kV; Select the IGBT of switching device 3.3kV/400A for use and set DC side when being 2.2kV, 8 converters series connection of every needs mutually).The power inverter of each series connection is the full-control type single-phase full bridge power inverter that four full-control type devices are formed, and is illustrated in figure 5 as the full-control type single-phase full bridge power inverter of Sub1 representative.The total reactor of series connection of the power inverter AC side that each is in series suppresses to realize the AC side harmonic wave.The capacitor group of a parallelly connected constant volume between two end lines of the DC side of single-phase fully controlled bridge power inverter.
Isolation level is divided into three parts: as the power inverter of high frequency DC/AC link, high frequency transformer with as the power inverter of high-frequency AC/DC link.High frequency DC/AC link power inverter is modulated into high-frequency signal more than the 1kHz (specifically definite according to the switching device that DC/AC link and AC/DC link power inverter are adopted) with the direct voltage of input; And be delivered to high-frequency AC/DC link converter through high frequency transformer and exchange end, high-frequency AC/DC link converter then is reduced to direct current with the high frequency ac signal of high frequency transformer output.High frequency transformer mainly plays the effect of voltage transformation and electrical isolation.Isolation level is made up of the same number of single-phase full bridge converter of connecting with input stage near the high-pressure side part; Each converter is the full-control type single-phase full bridge power inverter for being made up of four full-controlled switch devices all, and the corresponding end line of its two terminated line and input stage is connected; Isolation level also is the full-control type single-phase full bridge power inverter of being made up of four full-controlled switch devices near the converter of low-pressure side part; Its number also full-control type single-phase full bridge power inverter number with the high-pressure side series connection is identical, and the DC side output of this full-control type single-phase full bridge power inverter connects output stage dc energy storage electric capacity.
Wherein for first kind of second kind of topology, connect corresponding output-stage power converter respectively after the isolation level AC/DC power inverter DC side output connection output stage DC side storage capacitor near the low-voltage direct side; For the three or four kind of topology; Every mutually in input stage power inverter correspondence (as: input stage is every to need 8 power inverters series connection mutually by waiting number near the output of the isolation level AC/DC power inverter DC side of low-voltage direct side; Can 8 isolation level AC/DC power inverters near the low-voltage direct side of correspondence be divided into two groups so, every group each 4; Perhaps can 8 power inverters be divided into one group) be divided into several groups and be parallel to dc energy storage electric capacity respectively.For all four kinds of topologys of the present invention, the high frequency transformer of isolation level is the separate single phase transformer, and its quantity is identical with the full-control type single-phase full bridge power inverter number of high-pressure side series connection.These four kinds of topological structures are high modularization all, is convenient to design, produces, installs, debugs and safeguards.
Output stage is made up of many groups inverter power converter; The inverter power converter can be the Sub1 full-control type single-phase full bridge power inverter of being made up of four full-control type devices as shown in Figure 5; Also can be the Sub2 full-control type three-phase three brachium pontis power inverters of forming by six full-control type devices as shown in Figure 6; The two ends of the DC side of inverter power converter should connect prior to the DC side terminal pair of isolating transformer near low-pressure side, and AC side connects filter inductance one end of LC filter.
For first kind of the 3rd topology; Its output-stage power converter all is a full-control type single-phase full bridge power inverter; After the corresponding output-stage power converter of every phase input stage serial module structure connected filter inductance one end of LC filter separately, the other end of filter inductance was parallel to together and connects the filter capacitor of a total LC filter, thereby forms total output mutually; Corresponding three-phase constitutes three-phase four-wire system output, and is as shown in figures 1 and 3;
For second, for the 4th kind of topology; Its output-stage power converter all is full-control type three-phase three brachium pontis power inverters; After each output-stage power converter connects filter inductance one end of LC filter separately; Be connected to the filter capacitor of total LC filter after the corresponding separately parallel connection of the inductance other end, thereby form three-phase three-wire system output.
Described three-phase power electronic transformer series topology based on multistage multi-module cascade structure, input stage uses full-control type single-phase full bridge power inverter to be in series; The high frequency DC/AC link of isolation level and high-frequency AC/DC link power inverter all adopts full-control type single-phase full bridge power inverter; For first the third topology, output stage adopts the full-control type single-phase full bridge power inverter back independent three that respectively is in parallel to be combined to total three-phase output and to connect the three phase supply network; For the two or four kind of topology, output stage adopts full-control type three-phase three brachium pontis power inverter parallel-connection structures, and these four kinds of topologys can satisfy the needs of different voltages with different electric current and control and different qualities load.
Described three-phase power electronic transformer series topology based on multistage multi-module cascade structure, first the third topological output stage is applicable to three-phase three-wire system and three-phase four-wire system; And the power inverter of second kind of the 4th kind of topological output stage adopts full-control type three-phase three brachium pontis power inverters to be applicable to the three-phase three-wire system system, if also be applicable to three-phase four-wire system when adopting full-control type three-phase four-arm power inverter.
Claims (9)
1. the three-phase power electronic transformer based on multistage multi-module cascade structure is characterized in that its topological structure comprises input stage, isolation level, output stage, and every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter (2) that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity (3) between two outputs of each input stage power inverter (2); Whenever the total AC side of input stage power inverter that is in series is connected with reactor (1), is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter (4) of high frequency transformer (5) connection and the power inverter (6) of high-frequency AC/DC link; Each high frequency DC/AC link power inverter (4) of every phase connects one to one with the corresponding input stage power inverter (2) mutually of input stage;
In the three-phase of output stage; The output-stage power converter (8) of every phase connects one to one with the power inverter (6) of high-frequency AC/DC link; Be parallel with output stage dc energy storage electric capacity (7) between two inputs of each the output-stage power converter (8) in N, AC side is connected with LC filter (9);
Accumulate a phase, b phase and c respectively mutually after the parallel connection behind the output connection LC of the output-stage power converter (8) of each phase, another output of all output-stage power converters (8) comes together in the n point.
2. the three-phase power electronic transformer based on multistage multi-module cascade structure as claimed in claim 1; It is characterized in that the power inverter (6) and the output-stage power converter (8) of described input stage power inverter (2), high frequency DC/AC link power inverter (4), high-frequency AC/DC link all adopt full-control type single-phase full bridge power inverter.
3. the three-phase power electronic transformer based on multistage multi-module cascade structure as claimed in claim 1 is characterized in that, described input stage power inverter (2) output is connected with the input of high frequency DC/AC link power inverter (4);
The former limit of the output termination high frequency transformer (5) of high frequency DC/AC link power inverter (4), the secondary of high frequency transformer (5) connect the input of the power inverter (6) of high-frequency AC/DC link;
The output of the power inverter (6) of high-frequency AC/DC link is connected with the input of output-stage power converter (8); The output of output-stage power converter (8) connects the input of LC filter (9), and LC filter (9) connects the three phase supply network.
4. the three-phase power electronic transformer based on multistage multi-module cascade structure is characterized in that its topological structure comprises input stage, isolation level, output stage, and the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter (2) that comprises N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity (3) between two outputs of each input stage power inverter (2); Whenever the total AC side of input stage power inverter that is in series is connected with reactor (1), is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every N that comprises mutually is individual through the high frequency DC/AC link power inverter (4) of high frequency transformer (5) connection and the power inverter (6) of high-frequency AC/DC link; Each high frequency DC/AC link power inverter (4) of every phase connects one to one with the corresponding input stage power inverter (2) mutually of input stage;
In the three-phase of output stage; The output-stage power converter (8) of every phase connects one to one with the power inverter (6) of high-frequency AC/DC link; Be parallel with output stage dc energy storage electric capacity (7) between two inputs of each the output-stage power converter (8) in N; Three outputs of the output-stage power converter (8) of each phase all connect LC filter (9), accumulate a phase, b phase, c phase through LC filter (9) parallel connection.
5. the three-phase power electronic transformer based on multistage multi-module cascade structure as claimed in claim 4; It is characterized in that the power inverter (6) of described input stage power inverter (2), high frequency DC/AC link power inverter (4) and high-frequency AC/DC link all adopts full-control type single-phase full bridge power inverter; Output-stage power converter (8) adopts full-control type three-phase three brachium pontis power inverters.
6. the three-phase power electronic transformer based on multistage multi-module cascade structure is characterized in that its topological structure comprises input stage, isolation level, output stage, and every grade power inverter includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter (2) that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity (3) between two outputs of each input stage power inverter (2); Whenever the total AC side of input stage power inverter that is in series is connected with reactor (1), is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter (4) of high frequency transformer (5) connection and the power inverter (6) of high-frequency AC/DC link; Each high frequency DC/AC link power inverter (4) of every phase connects one to one with the corresponding input stage power inverter (2) mutually of input stage;
Power inverter (6) the parallel connection back of two high-frequency AC/DC link in every isolated level is connected with corresponding output-stage power converter (8) mutually; Be parallel with output stage dc energy storage electric capacity (7) between two inputs of each output-stage power converter (8); An output of the output-stage power converter (8) of each phase accumulates a phase, b phase, c phase respectively through the parallel connection of LC filter, and another output of all output-stage power converters (8) accumulates the n point.
7. the three-phase power electronic transformer based on multistage multi-module cascade structure as claimed in claim 6; It is characterized in that the power inverter (6) and the output-stage power converter (8) of described input stage power inverter (2), high frequency DC/AC link power inverter (4), high-frequency AC/DC link all adopt full-control type single-phase full bridge power inverter.
8. the three-phase power electronic transformer based on multistage multi-module cascade structure is characterized in that its topological structure comprises input stage, isolation level, output stage, and the power inverter of input stage, isolation level includes two inputs and two outputs; The power inverter of output stage comprises two inputs and three outputs;
In the three-phase of input stage, every input stage power inverter (2) that comprises 2N identical series connection mutually, N is a natural number, is parallel with dc energy storage electric capacity (3) between two outputs of each input stage power inverter (2); Whenever the total AC side of input stage power inverter that is in series is connected with reactor (1), is connected mutually with one of input electrical network again, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, every 2N that comprises mutually is individual through the high frequency DC/AC link power inverter (4) of high frequency transformer (5) connection and the power inverter (6) of high-frequency AC/DC link; Each high frequency DC/AC link power inverter (4) of every phase connects one to one with the corresponding input stage power inverter (2) mutually of input stage;
Power inverter (6) the parallel connection back of two high-frequency AC/DC link in every isolated level is connected with corresponding output-stage power converter (8) mutually; Be parallel with output stage dc energy storage electric capacity (7) between two inputs of each the output-stage power converter (8) in N; Three outputs of the output-stage power converter (8) of each phase all connect LC filter (9), accumulate a phase, b phase, c phase through LC filter (9) parallel connection.
9. the three-phase power electronic transformer based on multistage multi-module cascade structure as claimed in claim 8; It is characterized in that the power inverter (6) of described input stage power inverter (2), high frequency DC/AC link power inverter (4) and high-frequency AC/DC link all adopts full-control type single-phase full bridge power inverter; Output-stage power converter (8) adopts full-control type three-phase three brachium pontis power inverters.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746393A (en) * | 2013-12-27 | 2014-04-23 | 西安交通大学 | A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| CN104201908A (en) * | 2014-09-24 | 2014-12-10 | 武汉大学 | Solid-state transformer based locomotive AC-DC-AC traction system and method |
| CN105164909A (en) * | 2013-02-27 | 2015-12-16 | 奥普蒂斯丁技术公司 | Method for DC-AC conversion |
| CN105591548A (en) * | 2015-12-31 | 2016-05-18 | 西安交通大学 | Self-balance type power electronic transformer based on multiport high-frequency transformer |
| CN107346887A (en) * | 2017-06-29 | 2017-11-14 | 西安交通大学 | The port flexibility multimode switch topology of middle pressure three based on electric power electric transformer |
| CN112928929A (en) * | 2021-01-28 | 2021-06-08 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1734914A (en) * | 2005-07-14 | 2006-02-15 | 华中科技大学 | Self-balanced electronic power transformer |
| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN101621254A (en) * | 2009-08-06 | 2010-01-06 | 东南大学 | Power electronic transformer applied to distribution network |
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN201623653U (en) * | 2009-11-20 | 2010-11-03 | 中国电力科学研究院 | Modularized electric power electronic transformer |
| CN201887672U (en) * | 2010-12-24 | 2011-06-29 | 东南大学 | High-power power electronic transformer based on fault-tolerant design |
| CN102130611A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Power electronic rectification transformer |
| JP2011182517A (en) * | 2010-02-26 | 2011-09-15 | Tokyo Institute Of Technology | Power converter |
-
2012
- 2012-08-30 CN CN2012103168768A patent/CN102832815A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1734914A (en) * | 2005-07-14 | 2006-02-15 | 华中科技大学 | Self-balanced electronic power transformer |
| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN101621254A (en) * | 2009-08-06 | 2010-01-06 | 东南大学 | Power electronic transformer applied to distribution network |
| CN201623653U (en) * | 2009-11-20 | 2010-11-03 | 中国电力科学研究院 | Modularized electric power electronic transformer |
| JP2011182517A (en) * | 2010-02-26 | 2011-09-15 | Tokyo Institute Of Technology | Power converter |
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN201887672U (en) * | 2010-12-24 | 2011-06-29 | 东南大学 | High-power power electronic transformer based on fault-tolerant design |
| CN102130611A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Power electronic rectification transformer |
Non-Patent Citations (2)
| Title |
|---|
| JIANJIANG SHI等: "Research on Voltage and Power Balance Control for Cascaded Modular Solid-State Transformer", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
| YU DU等: "High-voltage High-frequency Transformer Design for a 7.2kV to 120V/240V 20kVA Solid State Transformer", 《IEEE》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105164909A (en) * | 2013-02-27 | 2015-12-16 | 奥普蒂斯丁技术公司 | Method for DC-AC conversion |
| CN105164909B (en) * | 2013-02-27 | 2018-09-25 | Abb瑞士股份有限公司 | DC-AC conversion methods |
| CN103746393A (en) * | 2013-12-27 | 2014-04-23 | 西安交通大学 | A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range |
| CN103746393B (en) * | 2013-12-27 | 2016-01-13 | 西安交通大学 | The three-phase power electronic transformer of a kind of gamut autobalance asymmetric load |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| 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 |
| CN104201908A (en) * | 2014-09-24 | 2014-12-10 | 武汉大学 | Solid-state transformer based locomotive AC-DC-AC traction system and method |
| CN105591548A (en) * | 2015-12-31 | 2016-05-18 | 西安交通大学 | Self-balance type power electronic transformer based on multiport high-frequency transformer |
| CN107346887A (en) * | 2017-06-29 | 2017-11-14 | 西安交通大学 | The port flexibility multimode switch topology of middle pressure three based on electric power electric transformer |
| CN112928929A (en) * | 2021-01-28 | 2021-06-08 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
| CN112928929B (en) * | 2021-01-28 | 2022-05-20 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
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Application publication date: 20121219 |