CN103368427A - Single-phase inverter and system thereof and three-phase inverter and system thereof - Google Patents
Single-phase inverter and system thereof and three-phase inverter and system thereof Download PDFInfo
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- CN103368427A CN103368427A CN201210100586XA CN201210100586A CN103368427A CN 103368427 A CN103368427 A CN 103368427A CN 201210100586X A CN201210100586X A CN 201210100586XA CN 201210100586 A CN201210100586 A CN 201210100586A CN 103368427 A CN103368427 A CN 103368427A
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Abstract
The invention relates to a single-phase inverter and system thereof and a three-phase inverter and system thereof. The single-phase inverter comprises a first single-phase inverter circuit, a second single-phase inverter circuit, a drive circuit, a first coupling inductor and a second coupling inductor. The first single-phase inverter circuit and the second single-phase inverter circuit are configured to be connected in parallel with two ends of a DC source and are identical in structure. The drive circuit is configured in a way that the first single-phase inverter circuit is driven by a first drive signal, and the second single-phase inverter circuit is driven by a second drive signal, wherein the first drive signal is formed by modulating a first modulated wave and a first carrier wave, the second drive signal is formed by modulating a second modulated wave and a second carrier wave, and the phase of the first modulated wave is identical to the phase of the second modulated wave. The input end of the first coupling inductor receives the current outputted by the first single-phase inverter circuit, and the input end of the second coupling inductor receives the current outputted by the second single-phase inverter circuit. Besides, the first coupling inductor and the second coupling inductor are reversely coupled with each other, and the output end of the first coupling inductor and the output end of the second coupling inductor are connected with each other.
Description
Technical field
The present invention relates to inverter, be specifically related to single-phase inverter and system thereof and three-phase inverter and system thereof.
Background technology
Inverter plays a part direct current is converted to alternating current.Inverter is the important component part in the electricity generation system.Efficient is one of most important performance index of inverter.If improved efficiency then can be brought appreciable economic benefit.
Power device in the inverter and the loss of output inductor have limited the raising of inverter efficiency.The rise of the prices of raw and semifnished materials such as the Japanese TV play of market competition fierceness and iron and steel copper has brought very large cost pressure for inverter producer simultaneously.Owing to be subjected to the restriction of power device performance, the power device of traditional inverter topology and the loss of filter inductance have been difficult to reduce at present.In addition, the filter inductance volume is large, and cost is high.Therefore the inverter of developing high-performance and low-cost becomes the target of each inverter producer.
Traditional 2 level topology inverter is because after device for power switching opened, tube voltage drop was large, and on-state loss and switching loss are all very large, cause the total losses of device for power switching large, thereby have reduced the efficient of whole system.
Neutral-point-clamped type (Neutral point clamped, NPC) topology since device for power switching many with increased clamp diode and caused that total losses are large, efficient is low.
Therefore, expectation provides a kind of inverter that can reduce the loss of device for power switching and reduce inductor loss and cost.
Summary of the invention
Provide hereinafter about brief overview of the present invention, in order to basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is that the form of simplifying provides some concept, with this as the in greater detail preorder of discussing after a while.
A main purpose of the present invention is, single-phase inverter and system thereof and three-phase inverter and system thereof are provided.
According to an aspect of the present invention, provide a kind of single-phase inverter, having comprised: the first single-phase inversion circuit and the second single-phase inversion circuit, it is identical to be configured to be parallel to DC source two ends and structure; Drive circuit, be configured to described the first single-phase inversion circuit of the first drive and with the second drive the second single-phase inversion circuit, described first drives signal is formed by the first modulating wave and first carrier modulation, described second drives signal is formed by the second modulating wave and the second carrier modulation, and described the first modulating wave is identical with the phase place of described the second modulating wave; And first coupling inductor and the second coupling inductor, the input of described the first coupling inductor receives the electric current of described the first single-phase inversion circuit output, the input of described the second coupling inductor receives the electric current of described the second single-phase inversion circuit output, and described the first coupling inductor and described the second coupling inductor reverse coupled and its output link together.
According to another aspect of the present invention, a kind of single-phase inverter system is provided, comprise K aforesaid single-phase inverter, K is the integer more than or equal to 1, and wherein the output of K described the first coupling inductor and K described the second coupling inductor links together.
According to a further aspect of the invention, a kind of three-phase inverter is provided, comprise: the first three-phase inverting circuit and the second three-phase inverting circuit, it is identical to be configured to be parallel to DC source two ends and structure, wherein, described the first three-phase inverting circuit comprises mutually inverter circuit of an A phase inverter circuit, a B phase inverter circuit and a C, and described the second three-phase inverting circuit comprises mutually inverter circuit of the 2nd A phase inverter circuit, the 2nd B phase inverter circuit and the 2nd C; Drive circuit, be configured to drive mutually signal with an A respectively, the one B drives the mutually described A phase inverter circuit of drive of signal and a C mutually, a described B phase inverter circuit and a described C be inverter circuit mutually, and drive mutually signal with the 2nd A respectively, the 2nd B drives mutually described the 2nd A phase inverter circuit of drive of signal and the 2nd C mutually, described the 2nd B phase inverter circuit and described the 2nd C be inverter circuit mutually, modulating a described A drives mutually the used A phase modulating wave of signal and described the 2nd A of modulation to drive mutually the phase place of the 2nd used A phase modulating wave of signal identical, modulate a described B and drive mutually the used B phase modulating wave of signal and described the 2nd B of modulation to drive mutually the phase place of the 2nd used B phase modulating wave of signal identical, modulate a described C and drive mutually the used C phase modulating wave of signal to drive mutually the phase place of the 2nd used C phase modulating wave of signal identical with modulating described the 2nd C; Comprise an A the be coupled A filter circuit mutually of inductor of inductor and the 2nd A that is coupled; Comprise a B the be coupled B filter circuit mutually of inductor of inductor and the 2nd B that is coupled; Comprise a C the be coupled C filter circuit mutually of inductor of inductor and the 2nd C that is coupled; Wherein, the input of described coupling inductor receives respectively a described A phase inverter circuit, described the 2nd A phase inverter circuit, a described B phase inverter circuit, described the 2nd B phase inverter circuit, a described C phase inverter circuit and described the 2nd C be the corresponding output current of inverter circuit mutually, a described A be coupled inductor reverse coupled and its output of inductor and described the 2nd A that be coupled links together, a described B be coupled inductor reverse coupled and its output of inductor and described the 2nd B that be coupled links together, and a described C be coupled inductor coupled in reverse wi and its output of inductor and described the 2nd C that be coupled links together.
According to a further aspect of the invention, a kind of three-phase inverter system is provided, comprise: K aforesaid three-phase inverter, K is the integer more than or equal to 1, wherein, a K described A the be coupled output of inductor of inductor and K described the 2nd A that is coupled links together, a K described B the be coupled output of inductor of inductor and K described the 2nd B that is coupled links together, and K described C be coupled output of inductor of inductor and K described the 2nd C that is coupled links together.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing to the embodiment of the invention, can understand more easily above and other purpose of the present invention, characteristics and advantage.Parts in the accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, same or similar technical characterictic or parts will adopt identical or similar Reference numeral to represent.
Figure 1A is the diagram that illustrates according to an embodiment of the invention based on the single-phase inverter of the T-shaped topology of three level;
Figure 1B is the oscillogram that illustrates for carrier wave, modulating wave, driving signal and the voltage of the T-shaped topological T101 of the one or three level of Figure 1A;
Fig. 2 is the diagram that illustrates according to an embodiment of the invention based on the single-phase inverter of three level NPC topologys;
Fig. 3 illustrates the single-phase inverter system that is made of a plurality of topological structures according to an embodiment of the invention;
Fig. 4 A to 4C illustrates the according to an embodiment of the invention diagram of the various examples of filter circuit;
Fig. 5 illustrates the according to an embodiment of the invention diagram of three-phase inverter;
Fig. 6 illustrates the according to an embodiment of the invention block diagram of three-phase inverter system; And
Fig. 7 illustrates the according to an embodiment of the invention block diagram of three-phase inverter system.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.The element of describing in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with element and the feature shown in one or more other accompanying drawing or the execution mode.Should be noted that for purpose clearly, omitted expression and the description of parts that have nothing to do with the present invention, known to persons of ordinary skill in the art and processing in accompanying drawing and the explanation.
At first with reference to Figure 1A and 1B single-phase inverter 100 based on the T-shaped topology of three level is described according to an embodiment of the invention.
Shown in Figure 1A, single-phase inverter 100 comprises two T-shaped topologys of three level that are connected in parallel on DC source Udc two ends, the i.e. T-shaped topological T101 of the one or three level and the T-shaped topological T101 ' of the two or three level.Particularly, the T-shaped topological T101 of the one or three level comprises diode D101, D102, D103 and D104, device for power switching (hereinafter to be referred as switch) S101, S102, S103 and S104, and capacitor C101 and C102.The T-shaped topological T101 ' of the two or three level comprises diode D101 ', D102 ', D103 ' and D104 ', switch S 101 ', S102 ', S103 ' and S104 ', and capacitor C101 ' and C102 '.
Single-phase inverter 100 also comprises the first coupling inductor L101 that is connected with the output P2 of the T-shaped topological T101 of the one or three level and the second coupling inductor L101 ' that is connected with the output P2 ' of the T-shaped topological T101 ' of the two or three level.
(a) among Figure 1B shows the oscillogram of the driving signal a1, a2, a3 and the a4 that drive the T-shaped topological T101 of the one or three level.Wherein, drive signal a1 and be used for driving switch S101, drive signal a2 and be used for driving switch S102, drive signal a3 and be used for driving switch S103, drive signal a4 and be used for driving switch S104.
(b) among Figure 1B shows modulating wave (sine wave) and triangular wave 1 and triangular wave 2.Modulating wave and triangular wave 1 modulation generate the driving signal a1 that is used for driving switch S101 and the driving signal a3 that is used for driving switch S103.Modulating wave and triangular wave 2 are adjusted and are generated the driving signal a2 that is used for driving switch S102 and the driving signal a4 that is used for driving switch S104.
(c) among Figure 1B shows the T-shaped topological T101 of the one or three level voltage waveform from the output of P2 point under the driving that drives signal a1, a2, a3 and a4.
Although each parameter in Figure 1B is shown having special value, be to be understood that these numerical value only are concrete examples, and are not for specific restriction.
With regard to the T-shaped topological T101 of the one or three level, when switching between positive level voltage and zero level voltage, switch S 101 is moved under the driving that drives signal a1, and switch S 104 is normal open under the driving that drives signal a4.Particularly, when switch S 101 was connected, electric current flow through from DC source Udc positive bus-bar BUSP, switch S 101, some P2 and the first coupling inductor L101 flowed to load R always, and be positive level voltage for a some P2 place this moment.When switch S 101 disconnected, electric current flow through from mid point P1 diode D103, switch S 104, some P2 and the first coupling inductor L101 flowed to load R always, and this time point P2 is zero level voltage.
Similarly, when switching between negative level voltage and zero level voltage, switch S 102 is moved under the driving that drives signal a2, and switch S 103 is normal open under the driving that drives signal a3.Particularly, when switch S 102 was connected, electric current flow through from load R the first coupling inductor L101, some P2 and switch S 102 flowed to negative busbar BUSN always, and be negative level voltage for a some P2 place this moment.When switch S 102 disconnected, electric current flow through from load R the first coupling inductor L101, point, P2, diode D104 and switch S 103 flowed to mid point P1 always, and this time point P2 is zero level voltage.
The driving signal that is used for the T-shaped topological T101 ' of the two or three level and the driving class signal that is used for the T-shaped topological T101 of the one or three level are seemingly.It is all identical with the phase place of the modulating wave of the driving signal that is used for the T-shaped topological T101 of the one or three level for modulation for the modulating wave of the driving signal of the T-shaped topological T101 ' of the two or three level to be used for modulation.Like this, in the situation of coupling inductor L201 and L201 ' reverse coupled, coupling inductor L201 and L201 ' can fully offset from the electric current of P2 point output and the magnetic field that produces from the fundamental frequency of the electric current of P2 ' some output.
Be used for the carrier wave that modulation is used for the driving signal of the T-shaped topological T101 ' of the two or three level and can differ 180 degree with the phase place of carrier wave that is used for modulation and is used for the driving signal of the T-shaped topological T101 of the one or three level.Like this, coupling inductor L201 and L201 ' can partly offset from the electric current of P2 point output and the magnetic field that produces from the harmonic wave of the electric current of P2 ' some output.
The T-shaped topological T101 ' of the two or three level and the T-shaped topological T101 of the one or three level have similar structure, so operation principle is similar, does not repeat them here.
Switch on the auxiliary brachium pontis of the T-shaped topological T101 of the one or three level and the T-shaped topological T101 ' of the two or three level, it is switch S 103, S104, S103 ' and S104 ' only bear half when switching busbar voltage, therefore in loss far below 2 level topological sum NPC topology, can improve the operating efficiency of inverter.Thereby the T-shaped topology of three level is preferred.But, can find out that from description after a while thought of the present invention also can be applied to 2 level topology, perhaps be applied to other three level topologys, for example three level NPC topology.
In addition, shown in Figure 1A, single-phase inverter 100 can also comprise inductor L and capacitor C.In this case, the bank of inductors that the first coupling inductor L101 and the second coupling inductor L101 ' consist of has formed the LCL filter circuit with inductor L and capacitor C, is used for the electric current of the T-shaped topological T101 of the one or three level and the T-shaped topological T101 ' output of the two or three level is carried out filtering.
Alternatively, single-phase inverter 100 can not comprise inductance L and capacitor C, perhaps can include only capacitor C.In the situation that includes only a capacitor C, the bank of inductors that the first coupling inductor L101 and the second coupling inductor L101 ' consist of and capacitor C form the LC filter circuit.
Referring to Fig. 2 diagram based on the single-phase inverter 200 of three level NPC topologys is described according to an embodiment of the invention.
As shown in Figure 2, single-phase inverter 200 comprises two three level NPC types topologys that are connected in parallel on DC source Udc two ends, i.e. the one or three level NPC type topology N201 and the two or three level NPC type topology N201 '.Particularly, the one or three level NPC type topology N201 comprises diode D201, D202, D203, D204, D205 and D206, device for power switching (hereinafter to be referred as switch) S201, S202, S203 and S204, and capacitor C201 and C202.The two or three level NPC type topology N201 ' comprises diode D201 ', D202 ', D203 ', D204 ', D205 ' and D206 ', switch S 201 ', S202 ', S203 ' and S204 ', and capacitor C201 ' and C202 '.
Single-phase inverter 200 also comprises the first coupling inductor L201 that is connected with the output P2 of the one or three level NPC type topology N201 and the second coupling inductor L201 ' that is connected with the output P2 ' of the two or three level NPC type topology N201 '.
With regard to the one or three level NPC type topology N201, when between positive level voltage and zero level voltage, switching, switch S 201 actions, switch S 202 normal opens.Particularly, because switch S 202 normal opens, when switch S 201 is connected, electric current from DC source Udc, flow through positive bus-bar BUSP, switch S 201, switch S 202, some P2 and the first coupling inductor L201, flow to load R, at this moment, some P2 place is positive level voltage always.And because switch S 202 normal opens, when switch S 201 disconnected, electric current flow through from mid point P1 diode D205, switch S 202, some P2 and the first coupling inductor L201 flowed to load R always, and this time point P2 is zero level voltage.
When between negative level voltage and zero level voltage, switching, switch S 204 actions, switch S 203 normal opens.Particularly, because switch S 203 normal opens, when switch S 204 was connected, electric current flow through from load R the first coupling inductor L201, some P2, switch S 203 and switch S 204 flowed to negative busbar BUSN always, and at this moment, some P2 place is negative level voltage.And because switch S 203 normal opens, when switch S 204 disconnected, electric current flow through from load R the first coupling inductor L201, some P2, switch S 203 and diode D206 flowed to mid point P1 always, and this time point P2 is zero level voltage.
The two or three level NPC type topology N201 ' and the one or three level NPC type topology N201 have similar structure, so operation principle is similar, does not repeat them here.
Switch S 201 ', S202 ', S203 ', S204 ', S205 ' and the S206 ' of switch S 201, S202, S203, S204, S205 and the S206 of the one or three level NPC type topology N201 and the two or three level NPC type topology N201 ' switches under the driving from the respective drive signal of drive circuit (not shown in Fig. 2).
According to present embodiment, the phase place of modulating wave of driving signal of switch S 201, S202, S203 and S204 that is used for the one or three level NPC type topology N201 is identical with the phase place of the modulating wave of the switch S 201 ', S202 ', S203 ' and the S204 ' that are used for the topological N201 ' of the two or three level NPC type.The mutually phasic difference certain angle of phase place and the carrier wave of the switch S 201 ', S202 ', S203 ' and the S204 ' that are used for the topological N201 ' of the two or three level NPC type of carrier wave of driving signal that is used for switch S 201 ', S202 ', S203 ' and the S204 ' of the one or three level NPC type topology N201.Preferably, differ 180 degree, that is, and the angle that 360 degree obtain divided by the quantity (that is, 2) of three level NPC type topologys.
Preferably, the first coupling inductor L201 and the second coupling inductor L201 ' can be arranged to reverse coupled.By reverse coupled this two coupling inductor L201 and L201 ', can fully offset from magnetic field that electric current and the fundamental frequency from the electric current of P2 ' some output of P2 point output produce and magnetic field that the harmonic wave of partly offsetting these two output currents produces.
Be similar to the single-phase inverter 100 shown in Figure 1A and Figure 1B, single-phase inverter 200 can also comprise inductor L and capacitor C.In this case, the bank of inductors that the first coupling inductor L201 and the second coupling inductor L201 ' consist of has formed the LCL filter circuit with inductor L and capacitor C, is used for the electric current of the one or three level NPC type topology N201 and the two or three level NPC type topology N201 ' output is carried out filtering.
Be similar to the single-phase inverter 100 shown in Figure 1A, single-phase inverter 200 can not comprise inductance L and capacitor C, perhaps can include only capacitor C.
Abovely describe the single-phase inverter that is consisted of by two T-shaped topologys of three level with reference to Figure 1A, and described the single-phase inverter that is consisted of by two three level NPC topologys with reference to Fig. 2.But, be appreciated that, can use the T-shaped topological structure of three level more than two, or the single-phase inverter system that consists of more than two three level NPC topological structures.Perhaps, can use more than two two level topological structures or the single-phase inverter system that consists of more than two two level topological structures.
Referring to Fig. 3 the single-phase inverter system 300 that is made of a plurality of topological structures according to the embodiment of the invention is described.As shown in Figure 3, single-phase inverter system 300 comprises 2K single-phase inversion module, and wherein K is the integer more than or equal to 1.Each to the single-phase inversion module 2K of single-phase inversion module 1 can be the T-shaped topological structures of three level.Perhaps, each to the single-phase inversion module 2K of single-phase inversion module 1 can be three level NPC topologys.Perhaps each to the single-phase inversion module 2K of single-phase inversion module 1 can be two level topological structures.
Single-phase inverter system 300 also comprises filter circuit.Filter circuit can have the structure shown in Fig. 4 A, namely comprises 2K coupling filter inductor.Perhaps, filter circuit can have the structure shown in Fig. 4 B, comprises that namely 2K coupling filter inductor and capacitor C are to consist of the LC filter circuit.Perhaps filter circuit can have the structure shown in Fig. 4 C, comprises that namely 2K coupling filter inductor and capacitor C and inductor L are to consist of the LCL filter circuit.
In single-phase inverter shown in Figure 3 300, single-phase inversion module 1 can be connected in parallel to DC source (not shown in Fig. 3) to single-phase inversion module 2K.The phase place of modulating wave of driving signal that be used for to drive each single-phase inversion module is identical, and the phase place that drives the carrier wave of signal differs predetermined angular successively.Predetermined angular is preferably 360 °/2K.The output of 2K coupling inductor (shown in Fig. 4 A to Fig. 4 C) links together.2K coupling inductor arranged with the magnetic field that fundamental frequency was produced of the output current of offsetting 2K single-phase inversion module fully with identical winding direction and also partly offset the magnetic field that harmonic wave was produced in the output current.
Referring to Fig. 5 according to an embodiment of the invention three-phase inverter 500 is described.
As shown in Figure 5, three-phase inverter 500 comprises two three-phase inversion modules that are connected in parallel on DC source Udc two ends, i.e. the first three-phase inversion module 501 and the second three-phase inversion module 501 '.Particularly, the first three-phase inversion module 501 comprises mutually inverter circuit of the A phase inverter circuit, B phase inverter circuit and the C that are made of the T-shaped topology of three level respectively.Similarly, the second three-phase inversion module 501 ' also comprises mutually inverter circuit of A ' the phase inverter circuit, B ' phase inverter circuit and the C ' that are made of the T-shaped topology of three level respectively.
In order not make the mark complicated of accompanying drawing, the label of each device for power switching and diode is not shown in Fig. 5.In addition, the device for power switching that in Fig. 5, adopts and diode can with the device for power switching that adopts at Figure 1A and diode-like seemingly, do not giving unnecessary details at this.
Three-phase inverter 500 also comprises coupling inductor LA, LA ', LB, LB ', LC and LC '.The output point PA of A phase inverter circuit is connected to coupling inductor LA, and the output point PB of B phase inverter circuit is connected to coupling inductor LB, and the output point PC of C phase inverter circuit is connected to coupling inductor LC.Similarly, the output point PA ' of A ' phase inverter circuit is connected to coupling inductor LA ', and the output point PB ' of B ' phase inverter circuit is connected to coupling inductor LB ', and the output point PC ' of C ' phase inverter circuit is connected to coupling inductor LC '.
The output of coupling inductor LA and LA ' links together, and the output of coupling inductor LB and LB ' links together, and the output of coupling inductor LC and LC ' links together.
As shown in Figure 5, the output of the output of coupling inductor LA and LA ', coupling inductor LB and LB ' and the output of coupling inductor LC and LC ' are connected respectively to corresponding inductor and capacitor C, correspondingly to consist of the LCL circuit.
As discussing before, alternatively, three-phase inverter system 500 can not comprise inductance L and capacitor C, perhaps can include only capacitor C.In the situation that includes only a capacitor C, form the LC filter circuit.
A phase inverter circuit, B phase inverter circuit, C phase inverter circuit, A ' phase inverter circuit, B ' phase inverter circuit and C ' phase inverter circuit are worked under the driving of separately driving signal respectively.Be used for the modulating wave of the driving signal of A phase inverter circuit, the modulating wave of driving signal that is used for B phase inverter circuit and the phase place of modulating wave that is used for the driving signal of C phase inverter circuit and differ successively 120 °.
The phase place of the modulating wave of the driving signal of A ' phase inverter circuit is identical with the phase place of the modulating wave of the driving signal of A phase inverter circuit.The phase place of the modulating wave of the driving signal of B ' phase inverter circuit is identical with the phase place of the modulating wave of the driving signal of B phase inverter circuit.The phase place of the modulating wave of the driving signal of C ' phase inverter circuit is identical with the phase place of the modulating wave of the driving signal of C phase inverter circuit.The phase place of the modulating wave related with A phase inverter circuit and A ' phase inverter circuit, differ successively 120 degree with the phase place of the related modulating wave of B phase inverter circuit and B ' phase inverter circuit and with the phase place of the related modulating wave of C phase inverter circuit and C ' phase inverter circuit.
Be used for A phase inverter circuit the driving signal carrier wave be used for the mutually phase phasic difference predetermined angular of the carrier wave of the driving signal of inverter circuit of A '.Be used for B phase inverter circuit the driving signal carrier wave be used for the mutually phase phasic difference predetermined angular of the carrier wave of the driving signal of inverter circuit of B '.Be used for C phase inverter circuit the driving signal carrier wave be used for the mutually phase phasic difference predetermined angular of the carrier wave of the driving signal of inverter circuit of C '.Preferably, this predetermined angular is 180 degree.
Preferably, the negative coupling of coupling inductor LA and coupling inductor LA ', the negative coupling of coupling inductor LB and coupling inductor LB ', the negative coupling of coupling inductor LC and coupling inductor LC '.
Although the above three-phase inverter 500 of having described the T-shaped topology formations of three level with reference to Fig. 5.But the description according to before is appreciated that, also can be by other three level topologys, and for example the NPC topology consists of three-phase inverter.Perhaps, also can consist of three-phase inverter by two level topologys.
Referring to Fig. 6 the three-phase inverter system 600 that is made of a plurality of topological structures according to the embodiment of the invention is described.As shown in Figure 6, three-phase inverter system 600 comprises 2K three-phase inversion module, and wherein K is the integer more than or equal to 1.Each to the three-phase inversion module 2K of three-phase inversion module 1 can be three-phase inversion module 501 or the three-phase inversion module 501 ' that is similar to as shown in Figure 5.Perhaps, each to the three-phase inversion module 2K of three-phase inversion module 1 can be the three-phase inversion modules that three level NPC topology consists of.Perhaps each to the three-phase inversion module 2K of three-phase inversion module 1 can be the three-phase inversion module that two level topological structures consist of.
Three-phase inverter system 600 also comprises filter circuit A, filter circuit B and filter circuit C.Among filter circuit A, filter circuit B and the filter circuit C each can have the structure shown in Fig. 4 A, namely comprises 2K coupling filter inductor.Perhaps, each among filter circuit A, filter circuit B and the filter circuit C can have the structure shown in Fig. 4 B, comprises that namely 2K coupling filter inductor and capacitor C are to consist of the LC filter circuit.Perhaps each among filter circuit A, filter circuit B and the filter circuit C can have the structure shown in Fig. 4 C, comprises that namely 2K coupling filter inductor and capacitor C and inductor L are to consist of the LCL filter circuit.
In three-phase inverter shown in Figure 6 600, three-phase inversion module 1 can be connected in parallel to DC power supply (not shown in Fig. 6) to three-phase inversion module 2K.
The phase place of modulating wave of driving signal of A phase that be used for to drive three-phase inversion module 1 to 2K is identical, the phase place of modulating wave of driving signal of B phase that be used for to drive three-phase inversion module 1 to 2K is identical, the phase place of modulating wave of driving signal of C phase that be used for to drive three-phase inversion module 1 to 2K is identical, and differs 120 degree between these phase places.
The phase place of each carrier wave that respectively drives signal that be used for to drive each A phase of three-phase inversion module 1 to 2K differs predetermined angular successively.Similarly, the phase place of each carrier wave that respectively drives signal that be used for to drive each B phase of three-phase inversion module 1 to 2K differs predetermined angular successively, and the phase place of each carrier wave that respectively drives signal that is used for driving each B phase of three-phase inversion module 1 to 2K differs predetermined angular successively.Above-mentioned predetermined angular is preferably 360 °/2K.
Referring to Fig. 7 according to an embodiment of the invention three-phase inverter system 700 is described.The difference of Fig. 7 and Fig. 6 is that the filter circuit among Fig. 7 is different from the filter circuit among Fig. 6.Each filter circuit among Fig. 7 comprises two coupling inductors, and each filter circuit among Fig. 6 comprises 2K coupling inductor.Another difference of Fig. 7 and Fig. 6 is, the connected mode of filter circuit and load.The output of each filter circuit A among Fig. 7 links together, and the output of each filter circuit B links together, and the output of each filter circuit C links together.
Three-phase inversion module 1 to 2K among Fig. 7 and the function of the three-phase inversion module 1 to 2K among Fig. 6 and the driving class signal that adopts seemingly do not repeat them here.
The device for power switching (sometimes also being called for short switch) of describing herein can be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), mos field effect transistor (Metal-Oxide-Semiconductor Field Effect Transistor, MOSFET), can break thyristor (Gate Turn-off Thyristor, GTO) or any other suitable switching devices etc. of gate pole.
2 device for power switching of auxiliary brachium pontis can adopt common collector to connect in the middle of the above-mentioned T-shaped circuit topology, and perhaps common emitter connects.Module bus capacitor mid point can be connected to a bit up and down, also can not connect.In addition, the above-mentioned T-shaped topology that describes with reference to the accompanying drawings (no matter being single-phase or three-phase), the device for power switching parallel diode can the common anode utmost point or common cathode connection on the auxiliary brachium pontis.Module bus capacitor mid point can be connected to a bit up and down, also can not connect.Alternatively, output can connect a single-phase or three-phase transformer behind the single-phase or three-phase voltage output filtering.
In addition, inverter or inverter system can be applied to for example photovoltaic combining inverter according to an embodiment of the invention.
The present invention adopts coupling inductance PWM phase-shifting carrier wave technology, not only reduce the loss of power device, and the loss of decrease output inductor and cost, improved the efficient of inverter, reduce the complete machine cost of inverter, had great using value and wide market prospects.
Should emphasize that term " comprises/comprise " existence that refers to feature, key element, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.
The present invention and advantage thereof still are to be understood that and can carry out various changes, alternative and conversion in the situations that does not exceed the spirit and scope of the present invention that limited by appended claim.And scope of the present invention is not limited only to the specific embodiment of the described process of specification, equipment, means, method and step.The one of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use according to the present invention carry out with this essentially identical function of corresponding embodiment or obtain result essentially identical with it, existing and want exploited process, equipment, means, method or step future.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (24)
1. single-phase inverter comprises:
The first single-phase inversion circuit and the second single-phase inversion circuit, it is identical to be configured to be parallel to DC source two ends and structure;
Drive circuit, be configured to described the first single-phase inversion circuit of the first drive and with the second drive the second single-phase inversion circuit, described first drives signal is formed by the first modulating wave and first carrier modulation, described second drives signal is formed by the second modulating wave and the second carrier modulation, and described the first modulating wave is identical with the phase place of described the second modulating wave; And
The first coupling inductor and the second coupling inductor, the input of described the first coupling inductor receives the electric current of described the first single-phase inversion circuit output, the input of described the second coupling inductor receives the electric current of described the second single-phase inversion circuit output, and described the first coupling inductor and described the second coupling inductor reverse coupled and its output link together.
2. single-phase inverter according to claim 1, wherein, mutually phasic difference 180 degree of the phase place of described first carrier and described the second carrier wave.
3. single-phase inverter according to claim 1, wherein, described the first single-phase inversion circuit and described the second single-phase inversion circuit are two level topology or three level topology.
4. single-phase inverter according to claim 3, wherein, described three level topologys are the T-shaped topology of three level or three level neutral-point-clamped types topology.
5. each described single-phase inverter in 4 according to claim 1 also comprises:
Capacitor is connected to the output that links together of described the first coupling inductor and described the second coupling inductor to consist of the LC filter circuit.
6. each described single-phase inverter in 4 according to claim 1 also comprises:
Capacitor and inductor all are connected to the output that links together of described the first coupling inductor and described the second coupling inductor to consist of the LCL filter circuit.
7. a single-phase inverter system comprises K single-phase inverter according to claim 1, and K is the integer more than or equal to 1, and wherein the output of K described the first coupling inductor and K described the second coupling inductor links together.
8. single-phase inverter according to claim 7 system, wherein, the phase place of K described first carrier and K described the second carrier wave differs the 360/K degree successively.
9. single-phase inverter according to claim 7 system, wherein, K described the first single-phase inversion circuit and K described the second single-phase inversion circuit are two level topology or three level topology.
10. single-phase inverter according to claim 9 system, wherein, described three level topologys are the T-shaped topology of three level or three level neutral-point-clamped types topology.
11. each described single-phase inverter system in 10 according to claim 7 also comprises:
Capacitor is connected to the output that links together of K described the first coupling inductor and K described the second coupling inductor to consist of the LC filter circuit.
12. each described single-phase inverter system in 10 according to claim 7 also comprises:
Capacitor and inductor all are connected to output that K described the first coupling inductor and K described the second coupling inductor links together to consist of the LCL filter circuit.
13. a three-phase inverter comprises:
The first three-phase inverting circuit and the second three-phase inverting circuit, it is identical to be configured to be parallel to DC source two ends and structure, wherein, described the first three-phase inverting circuit comprises mutually inverter circuit of an A phase inverter circuit, a B phase inverter circuit and a C, and described the second three-phase inverting circuit comprises mutually inverter circuit of the 2nd A phase inverter circuit, the 2nd B phase inverter circuit and the 2nd C;
Drive circuit, be configured to drive mutually signal with an A respectively, the one B drives the mutually described A phase inverter circuit of drive of signal and a C mutually, a described B phase inverter circuit and a described C be inverter circuit mutually, and drive mutually signal with the 2nd A respectively, the 2nd B drives mutually described the 2nd A phase inverter circuit of drive of signal and the 2nd C mutually, described the 2nd B phase inverter circuit and described the 2nd C be inverter circuit mutually, modulating a described A drives mutually the used A phase modulating wave of signal and described the 2nd A of modulation to drive mutually the phase place of the 2nd used A phase modulating wave of signal identical, modulating a described B drives mutually the used B phase modulating wave of signal and described the 2nd B of modulation to drive mutually the phase place of the 2nd used B phase modulating wave of signal identical, modulating a described C drives mutually the used C phase modulating wave of signal and described the 2nd C of modulation to drive mutually the phase place of the 2nd used C phase modulating wave of signal identical
Comprise an A the be coupled A filter circuit mutually of inductor of inductor and the 2nd A that is coupled;
Comprise a B the be coupled B filter circuit mutually of inductor of inductor and the 2nd B that is coupled;
Comprise a C the be coupled C filter circuit mutually of inductor of inductor and the 2nd C that is coupled;
Wherein, the input of described coupling inductor receives respectively a described A phase inverter circuit, described the 2nd A phase inverter circuit, a described B phase inverter circuit, described the 2nd B phase inverter circuit, a described C phase inverter circuit and described the 2nd C be the corresponding output current of inverter circuit mutually, a described A be coupled inductor reverse coupled and its output of inductor and described the 2nd A that be coupled links together, a described B be coupled inductor reverse coupled and its output of inductor and described the 2nd B that be coupled links together, and a described C be coupled inductor coupled in reverse wi and its output of inductor and described the 2nd C that be coupled links together.
14. three-phase inverter according to claim 13, wherein, modulate a described A and drive mutually the used A phase carrier wave of signal, modulate a described B and drive mutually the used B phase carrier wave of signal and the described C of modulation to drive mutually the phase place of the used C phase carrier wave of signal identical, modulate described the 2nd A and drive mutually the 2nd used A phase carrier wave of signal, modulate described the 2nd B drive mutually the 2nd used B phase carrier wave of signal and described the 2nd C of modulation drive mutually the phase place of the 2nd used C phase carrier wave of signal identical but with a described A phase carrier wave, described the 2nd A phase carrier wave and described the 3rd A be phase phasic difference 180 degree of carrier wave mutually.
15. three-phase inverter according to claim 13, wherein, a described A phase inverter circuit, a described B phase inverter circuit, a described C phase inverter circuit, described the 2nd A phase inverter circuit, described the 2nd B phase inverter circuit and described the 2nd C mutually inverter circuit be two level topologys or three level topology.
16. three-phase inverter according to claim 15, wherein, described three level topologys are the T-shaped topology of three level or three level neutral-point-clamped types topology.
17. each described three-phase inverter in 16 according to claim 13, wherein,
Described A phase filter circuit also comprises: A phase capacitor, and it is connected to be coupled inductor and described the 2nd A of a described A and is coupled the output that links together of inductor to consist of A LC filter circuit mutually;
Described B phase filter circuit also comprises: B phase capacitor, and it is connected to be coupled inductor and described the 2nd B of a described B and is coupled the output that links together of inductor to consist of B LC filter circuit mutually; And/or
Described C phase filter circuit also comprises: C phase capacitor, it is connected to be coupled inductor and described the 2nd C of a described C and is coupled the output that links together of inductor to consist of C LC filter circuit mutually.
18. each described three-phase inverter in 16 according to claim 13, wherein,
Described A phase filter circuit also comprises: A phase capacitor and A phase inductance device all are connected to be coupled inductor and described the 2nd A of a described A and are coupled the output that links together of inductor to consist of A LCL filter circuit mutually;
Described B phase filter circuit also comprises: B phase capacitor and B phase inductance device all are connected to be coupled inductor and described the 2nd B of a described B and are coupled the output that links together of inductor to consist of B LCL filter circuit mutually; And/or
Described C phase filter circuit also comprises: C phase capacitor and C phase inductance device all are connected to be coupled inductor and described the 2nd C of a described C and are coupled the output that links together of inductor to consist of C LCL filter circuit mutually.
19. three-phase inverter system, comprise: K three-phase inverter according to claim 13, K is the integer more than or equal to 1, wherein, a K described A the be coupled output of inductor of inductor and K described the 2nd A that is coupled links together, a K described B the be coupled output of inductor of inductor and K described the 2nd B that is coupled links together, and K described C be coupled output of inductor of inductor and K described the 2nd C that is coupled links together.
20. three-phase inverter according to claim 19 system, wherein, the phase place of carrier wave that is used for the driving signal of each A phase inverter circuit of modulation differs the 360/K degree successively, the phase place of carrier wave that is used for the driving signal of each B phase inverter circuit of modulation differs the 360/K degree successively, and the phase place of carrier wave that is used for the driving signal of each C phase inverter circuit of modulation differs the 360/K degree successively.
21. three-phase inverter according to claim 19 system, wherein, a K described A phase inverter circuit, a K described B phase inverter circuit, a K described C phase inverter circuit, K described the 2nd an A phase inverter circuit, K described the 2nd a B phase inverter circuit and K described the 2nd C mutually inverter circuit be two level topology or three level topology.
22. three-phase inverter according to claim 21 system, wherein, described three level topologys are the T-shaped topology of three level or three level neutral-point-clamped types topology.
23. each described three-phase inverter system in 22 according to claim 19 also comprises:
A phase capacitor is connected to be coupled inductor and K described the 2nd A of a K described A and is coupled the output that links together of inductor to consist of A LC filter circuit mutually;
B phase capacitor is connected to be coupled inductor and K described the 2nd B of a K described B and is coupled the output that links together of inductor to consist of B LC filter circuit mutually; And
C phase capacitor is connected to be coupled inductor and K described the 2nd C of a K described C and is coupled the output that links together of inductor to consist of C LC filter circuit mutually.
24. each described three-phase inverter system in 22 according to claim 19 also comprises:
A phase capacitor and A phase inductance device all are connected to be coupled inductor and K described the 2nd A of a K described A and are coupled the output that links together of inductor to consist of A LCL filter circuit mutually;
B phase capacitor and B phase inductance device all are connected to be coupled inductor and K described the 2nd B of a K described B and are coupled the output that links together of inductor to consist of B LCL filter circuit mutually; And
C phase capacitor and C phase inductance device all are connected to be coupled inductor and K described the 2nd C of a K described C and are coupled the output that links together of inductor to consist of C LCL filter circuit mutually.
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