CN102820666B - Three-phase power electronic transformer capable of balancing asymmetric load - Google Patents
Three-phase power electronic transformer capable of balancing asymmetric load Download PDFInfo
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- CN102820666B CN102820666B CN201210315989.6A CN201210315989A CN102820666B CN 102820666 B CN102820666 B CN 102820666B CN 201210315989 A CN201210315989 A CN 201210315989A CN 102820666 B CN102820666 B CN 102820666B
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Abstract
The invention discloses a three-phase power electronic transformer capable of balancing asymmetric load. The transformer is divided into an input level, an isolation level and an output level, output ends of input-level power converters are connected with input ends of high-frequency DC (direct current)/AC (alternating current) link power converters, output ends of the high-frequency DC/AC link power converters are connected with primary sides of high-frequency transformers, secondary sides of the high-frequency transformers are connected with the input ends of the high-frequency DC/AC link power converters, the output ends of the high-frequency DC/AC link power converters are connected with input ends of output-level power converters, and output ends of the output-level power converters are connected with input ends of LC filters which are connected with a three-phase power supply network. The three-phase power electronic transformer capable of balancing asymmetric load can realize basic functions of transformation, isolation, energy transfer and the like of conventional power transformers, and as for input voltages of different levels, the serial module number of corresponding input levels only needs to be calculated, and corresponding voltage can be borne by serial connection according to corresponding module number.
Description
Technical field
The invention belongs to electric power electric transformer technical field, relate to a kind of three-phase power electronic transformer of the balanced asymmetric load based on multistage multi-module cascade structure.
Background technology
In electric power system, the main traditional power transformer playing transformation and buffer action is widely used.On the one hand, traditional power transformer has that efficiency is high, cost is low, reliability is high, advantages of simple structure and simple; On the other hand, it also has obvious shortcoming, heavy, volume is large, no-load loss is large, function singleness, uses transformer oil to threaten environment structure, and when being with nonlinear load, distortion current can pollute electrical network, and electrical network has during fluctuation can affect load etc. again.Along with the development of electric power system, especially the development of distributed generation system and new forms of energy, can also realize load-side pressure regulation, Active PFC, input and output both sides harmonics restraint etc. function in the urgent need to a kind of new device for converting electric energy except realizing electrical isolation and transformation function, volume is little, lightweight simultaneously, no-load loss is little.Obviously, traditional power transformer cannot meet these application requirements.
Along with the development of power electronic technology, the concept 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 traditional power transformer.PET is after the beginning of the seventies in last century is suggested, and experienced by desultory development in 40 years, many topologys are suggested.These topologys, from the progression angle of cascade, can be divided into single step arrangement, two-layer configuration and tertiary structure; Can be divided into based on full bridge structure with based on diode clamp or striding capacitance structure two class from modularization angle.From the progression angle of cascade, the progression of cascade is more, and the function that PET can realize is more, thus now mainly based on tertiary structure; From modularization angle, for high-power high-voltage voltage application scenario, having larger advantage based on full bridge structure than based on diode clamp or striding capacitance structure, is thus also the main flow of research now.
At present, because existing power electronic device cost is higher comparatively speaking, the overall cost of electric power electric transformer wants high a lot of relative to traditional power transformer.Along with the development of power electronic device level and high frequency transformer material, electric power electric transformer will progressively substitute the position of traditional power transformer in electric power system.
Summary of the invention
The problem that the present invention solves is the three-phase power electronic transformer providing a kind of balanced asymmetric load based on multistage multi-module cascade structure, the function of traditional transformer voltage transformation, electrical isolation and Two-way energy transfer can not only be realized, and be convenient to produce, debug and safeguard.
The present invention is achieved through the following technical solutions:
First the first topological structure is proposed:
Balance a three-phase power electronic transformer for asymmetric load, it is characterized in that, its topological structure comprises input stage, isolation level, output stage, and the power inverter of every grade includes two inputs and two outputs;
In the three-phase of input stage, often comprise the input stage power inverter of the individual identical series connection of 3N mutually, N is natural number, is parallel with DC energy storage electric capacity between two outputs of each input stage power inverter; The total AC of the input stage power inverter be often in series is connected with reactor, then is connected mutually with one of input electrical network, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, often comprise the power inverter of high frequency DC/AC link power inverter that 3N connected by high frequency transformer and high-frequency AC/DC link mutually; Each high frequency DC/AC link power inverter of every phase connects one to one with the input stage power inverter of the corresponding phase 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 output-stage power converter in 3N, AC is connected with LC filter;
Every mutually in all have an output of the output-stage power converter of 1/3 by LC filter respectively interconnection come together in a phase, b phase and c phase, another output of all output-stage power converters comes together in n point.
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 LC filter connects three phase supply network.
Described from input stage, isolation level to output stage, the change of interchange, direct current is followed successively by:
In input stage, input electrical network exchanges input and converts direct current to through input stage power inverter, and passes to isolation level by DC energy storage electric capacity;
In isolation level, direct current input converts interchange to by isolation level high frequency DC/AC link power inverter, and the power inverter of high-frequency AC/DC link is passed to by high frequency transformer, convert direct current to by the power inverter of high-frequency AC/DC link again, and pass to output stage by DC energy storage electric capacity;
In output stage, direct current input converts interchange to by output-stage power converter, and by LC filter passes to three phase supply network.
Described output stage DC energy storage electric capacity both sides can also connect the generating network of solar energy or wind energy by power inverter.
The present invention proposes the second topological structure further:
Can balance a three-phase power electronic transformer for asymmetric load based on multistage multi-module cascade structure, its topological structure comprises input stage, isolation level, output stage, and the power inverter of every grade includes two inputs and two outputs;
In the three-phase of input stage, often comprise the input stage power inverter of the individual identical level series connection of 6N mutually, N is natural number, is parallel with DC energy storage electric capacity between two outputs of each input stage power inverter; The total AC of the input stage power inverter be often in series is connected with reactor, then is connected mutually with one of input electrical network, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, often comprise the power inverter of high frequency DC/AC link power inverter that 6N connected by high frequency transformer and high-frequency AC/DC link mutually; Each high frequency DC/AC link power inverter of every phase connects one to one with the input stage power inverter of the corresponding phase of input stage; Output stage DC energy storage electric capacity is parallel with between the output of the power inverter of high-frequency AC/DC link;
In the three-phase of output stage, often be provided with 2N output-stage power converter mutually, one of every phase in three-phase, be connected with the input of an output-stage power converter after the output interconnection of the three-phase power inverter of three high-frequency AC/DC links altogether collects, its output is connected with LC filter, an output of the output-stage power converter of every phase is collected by LC filter, three-phase comes together in a phase, b phase and c phase respectively, and another output of all output-stage power converters comes together in n point.
Described can balance in the three-phase power electronic transformer of asymmetric load based on multistage multi-module cascade structure, one is extracted from the power inverter of every phase 6N high-frequency AC/DC link corresponding to input stage, three-phase totally three connect in parallel, and then connect the power inverter of output stage, be connected in the same way every mutually in other the power inverter of 6N-1 high-frequency AC/DC link, mode in parallel is adopted to connect the filter capacitor of rear connection LC filter the output of every filter inductance of interior 2N group output stage mutually again, thus the phase forming output stage total exports.
Compared with prior art, the three-phase power electronic transformer that can balance asymmetric load based on multistage multi-module cascade structure provided by the invention has following useful technique effect:
1, transformation, isolation, energy transferring etc. the basic function of traditional power transformer can be realized;
2, input stage adopts the tandem type modular power converters of three-phase structure, in the face of the input voltage of different brackets, only needs to calculate corresponding input stage serial module structure number, just can bear corresponding voltage according to respective modules string connection;
3, the present invention can whole modularizations, are convenient to produce, debugging and safeguarding;
4, the present invention can realize the isolation of load and electric power system, provides protective effect to load, as required for grid side provides reactive power compensation or active power filtering function, can improve the electrical network quality of power supply and operational reliability;
5, the present invention can the supply power voltage of regulation output level, the amplitude of electric current and phase place automatically, solves line voltage and falls temporarily, rises temporarily, fluctuates and the power quality problem such as flickering;
6, the present invention can tackle asymmetric load well, the asymmetric connection by topology of load-side is transformed into net side naturally symmetrical; The threephase load side maximum degree of unbalance of power calculates by following formula;
Suppose that output stage three phase supply power is for (aP, bP, cP), wherein P is rated power, and a, b, c are for supplying electrostrictive coefficient, and a, b, c are less than or equal to 1 for being more than or equal to 0, and wherein a is more than or equal to b and c.
Wherein V
gridfor line voltage, m is input stage power inverter modulation degree, and ω is electrical network angular frequency, and L is reactor inductance value, I
gridfor rated current, V
dcfor input stage direct current energy storage capacitors voltage, u
unbalancefor the maximum degree of unbalance of other two-phase power.
7, DC side of the present invention can be accessed by the new energy resources system such as solar energy, wind energy;
8, two kinds of topological structures of the present invention according to different power grades and can control order ground and flexible Application.
Accompanying drawing explanation
Fig. 1 is one of topological overall structure block diagram of three-phase power electronic transformer based on multistage multi-module cascade structure;
Fig. 2 is the topological overall structure block diagram two of the three-phase power electronic transformer based on multistage multi-module cascade structure;
Fig. 3 is the circuit structure diagram of full-bridge power converter unit;
Wherein, 1 be reactor, 2 be input stage power inverter, 3 be input stage DC energy storage electric capacity, 4 be high frequency DC/AC link power inverter, 5 be high frequency transformer, 6 be high-frequency AC/DC link power inverter, 7 be output stage DC energy storage electric capacity, 8 be output-stage power converter, 9 for LC filter;
11 is the second output for first input end, 12 be the second input, 13 is the first output, 14.
Embodiment
The three-phase power electronic transformer that can balance asymmetric load based on multistage multi-module cascade structure provided by the invention, adopt the technical scheme of high-pressure side series connection, low-pressure side parallel connection, three-phase structure is identical and independent.Two kinds of all topological overall structures are divided into three grades: input stage, isolation level and output stage.Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail, and the explanation of the invention is not limited.
Embodiment 1
Can balance the three-phase power electronic transformer of asymmetric load based on multistage multi-module cascade structure, adopt topological structure as described in Figure 1, comprise input stage, isolation level, output stage, the power inverter of every grade includes two inputs and two outputs;
Concrete each power inverter is the full-control type single-phase full bridge power inverter of four wholly-controled device compositions, and its structure is illustrated in figure 3 the full-control type single-phase full bridge power inverter of Sub representative.The total series connection reactor of the power inverter AC that each is in series is to realize AC harmonics restraint.The Capacitor banks of certain capacity in parallel between company's end line of the DC side of single-phase fully controlled bridge power inverter.
In the three-phase of input stage, the input stage power inverter 2, N often comprising the individual identical series connection of 3N is mutually natural number, is parallel with DC energy storage electric capacity 3 between two outputs of each input stage power inverter 2; The total AC of the input stage power inverter be often in series is connected with reactor 1, then is connected mutually with one of input electrical network, and triangle connects or Y-connection between phase and phase;
By input voltage grade and selected power electronic device level, the series connection number of the power inverter of input stage is determined that (as: input voltage is 11kV, select the IGBT of switching device 1.7kV/400A and to set DC side be 1kV time, often need 18 converters series connection mutually).
In the three-phase of isolation level, be divided into three parts: as the power inverter 6 of high frequency DC/AC link power inverter 4, high frequency transformer 5 and high-frequency AC/DC link; The direct voltage of input is modulated into the high-frequency signal (switching device that specifically will adopt according to DC/AC link and AC/DC link power inverter is determined) of more than 1kHz by high frequency DC/AC link power inverter 4, and being delivered to high-frequency AC/DC link converter 6 interchange end by high frequency transformer 5, the high frequency ac signal that high frequency transformer exports is reduced to direct current by high-frequency AC/6, DC link converter.High frequency transformer 5 mainly plays the effect of voltage transformation and electrical isolation.
In the three-phase of isolation level, often comprise the power inverter 6 of high frequency DC/AC link power inverter 4 that 3N connected by high frequency transformer 5 and high-frequency AC/DC link mutually; Each high frequency DC/AC link power inverter 4 of every phase connects one to one with the input stage power inverter 2 of the corresponding phase of input stage;
Concrete, isolation level forms by with input stage string the same number of full-control type single-phase full bridge power inverter near input stage part, the full-control type single-phase full bridge power inverter of each converter all for being made up of four full-controlled switch devices, its two terminated line is connected with the corresponding end line of input stage; Isolation level is also the full-control type single-phase full bridge power inverter be made up of four full-controlled switch devices near the converter of output stage part, its number is also identical with the full-control type single-phase full bridge power inverter number of input stage series connection, and the DC side of this full-control type single-phase full bridge power inverter exports and connects output stage DC energy storage electric capacity.
Corresponding output-stage power converter is connected respectively after the isolation level AC/DC power inverter DC side of output stage DC side exports connection output stage DC side storage capacitor;
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 output-stage power converter 8 in 3N, AC is connected with filter inductance one end of LC filter 9(AC series LC filter);
Every mutually in all have an output of the output-stage power converter 8 of 1/3 by LC filter 9 respectively interconnection come together in a phase, b phase and c phase, another output of all output-stage power converters 8 comes together in n point.
Concrete, the three-phase of described input stage is respectively A phase, B phase, C phase, and output-stage power converter 8 one outputs corresponding to every phase 1/3 in the three-phase of A phase, B phase, C phase in output stage come together in a phase by the interconnection of LC filter; Output-stage power converter 8 one outputs corresponding to phase 1/3 every in the three-phase of A phase, B phase, C phase come together in b phase by the interconnection of LC filter; Output-stage power converter 8 one outputs corresponding to phase 1/3 every in the three-phase of A phase, B phase, C phase come together in c phase by the interconnection of LC filter; Another output of all output-stage power converters 8 comes together in n point.
Or, after output-stage power converter corresponding to every phase input stage cascade module connects filter inductance one end of respective LC filter, connect a total filter capacitor together with the other end filter inductance be connected with power inverter of number such as choosing from three-phase is symmetrically parallel to, thus form a total phase and export.
Embodiment 2
The three-phase power electronic transformer of asymmetric load can be balanced based on multistage multi-module cascade structure, adopt the second topological structure as shown in Figure 2, comprise input stage, isolation level, output stage, the power inverter of every grade includes two inputs and two outputs;
The connected mode that the connection of input stage, isolation level is identical with embodiment 1 and be 6N by the number of variations of power inverter, difference is the connected mode of output stage:
In the three-phase of output stage, often be provided with 2N output-stage power converter 8 mutually, one of every phase in three-phase, be connected with the input of an output-stage power converter 8 after the output interconnection of the three-phase power inverter 6 of three high-frequency AC/DC links altogether collects, its output is connected with LC filter 9, an output of the output-stage power converter 8 of every phase collects, and three-phase comes together in a phase, b phase and c phase respectively, and another output of all output-stage power converters 8 comes together in n point.
The high frequency transformer of isolation level is 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 cascade.
The corresponding isolation level AC/DC power inverter DC side near low-voltage direct side of every phase input stage power inverter exports by waiting number to be divided into several groups equably, and the power inverter number such as taking out symmetrically from AC/DC power inverter group corresponding to three-phase input stage power inverter is parallel to the input that DC energy storage electric capacity connects output-stage power converter again.
Such as: input stage often needs 6 power inverter cascades mutually, so the isolation level AC/DC power inverter of a close low-voltage direct side, 6 of correspondence can be divided into two groups equably and often organize each 3, or 6 power inverters can be divided into one group; Input stage often needs 9 power inverter cascades mutually, so the isolation level AC/DC power inverter of a close low-voltage direct side, 9 of correspondence can be divided into three groups equably and often organize each 3, or 9 power inverters can be divided into one group.
Or, total output-stage power converter is divided into three groups, after power inverter often in group connects filter inductance one end of respective LC filter, the mode of the inductance other end one parallel connection connect be connected to total LC filter filter capacitor on, thus the total phase forming output stage exports.
Embodiment 1 and the two kinds of topological structures all high modularizations described in embodiment 2, be convenient to design, produce, install, debug and safeguard, according to different power grades and can control order ground and flexible Application.
Claims (4)
1. can balance a three-phase power electronic transformer for asymmetric load, it is characterized in that, its topological structure comprises input stage, isolation level, output stage, and the power inverter of every grade includes two inputs and two outputs;
In the three-phase of input stage, every input stage power inverter (2) comprising the individual identical level series connection of 6N mutually, N is natural number, is parallel with DC energy storage electric capacity (3) between two outputs of each input stage power inverter (2); The total AC of the input stage power inverter be often in series is connected with reactor (1), then is connected mutually with one of input electrical network, and triangle connects or Y-connection between phase and phase;
In the three-phase of isolation level, often comprise the power inverter (6) of high frequency DC/AC link power inverter (4) that 6N connected by high frequency transformer (5) and high-frequency AC/DC link mutually; Each high frequency DC/AC link power inverter (4) of every phase connects one to one with the input stage power inverter (2) of the corresponding phase of input stage; Output stage DC energy storage electric capacity (7) is parallel with between the output of the power inverter (6) of high-frequency AC/DC link;
In the three-phase of output stage, often be provided with 2N output-stage power converter (8) mutually, one of every phase in three-phase, be connected with the input of an output-stage power converter (8) after the output interconnection of the three-phase power inverter (6) of three high-frequency AC/DC links altogether collects, output-stage power converter (8) output is connected with LC filter (9), an output of the output-stage power converter (8) of every phase is collected by LC filter (9), three-phase comes together in a phase respectively, b phase and c phase, another output of all output-stage power converters (8) comes together in n point.
2. can balance the three-phase power electronic transformer of asymmetric load as claimed in claim 1, it is characterized in that, one is extracted from the power inverter (6) of every phase 6N high-frequency AC/DC link corresponding with input stage, three-phase totally three connect in parallel, and then connect output-stage power converter (8), the power inverter (6) of all the other 6N-1 high-frequency AC/DC links of every phase that is connected in the same way, mode in parallel is adopted to connect the filter capacitor of rear connection LC filter (9) output of every filter inductance of the LC filter (9) of interior 2N output stage mutually again, thus the phase forming output stage total exports.
3. can balance the three-phase power electronic transformer of asymmetric load as claimed in claim 1, it is characterized in that, 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.
4. can balance the three-phase power electronic transformer of asymmetric load as claimed in claim 1, it 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) 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 three phase supply network.
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| CN201210315989.6A CN102820666B (en) | 2012-08-30 | 2012-08-30 | Three-phase power electronic transformer capable of balancing asymmetric load |
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Families Citing this family (5)
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| CN103516230B (en) * | 2013-10-14 | 2016-08-10 | 国家电网公司 | Many level that bi-directional current controls balance solid-state transformer and its implementation mutually |
| 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 |
| 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 |
| CN107104443B (en) * | 2017-06-21 | 2023-05-23 | 西南交通大学 | Power electronic transformer |
| CN108551266A (en) * | 2018-05-11 | 2018-09-18 | 燕山大学 | A kind of self-balancing electric power electric transformer and control method adapting to asymmetric load |
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