CN102195494B - Power converter - Google Patents
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- CN102195494B CN102195494B CN201110054909.1A CN201110054909A CN102195494B CN 102195494 B CN102195494 B CN 102195494B CN 201110054909 A CN201110054909 A CN 201110054909A CN 102195494 B CN102195494 B CN 102195494B
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Abstract
The present invention provides a power converter. The task of the invention is to restrain application of a high voltage between adjacent secondary windings of a transformer which is connected with a plurality of single-phase three-level inverter units thereby simplifying an insulation structure and minimizing the transformer. A settlement solution of the invention is characterized in that: when at least first AC input terminals (11-14) of a first single-phase three-level inverter unit (S1) and a second single-phase three-level inverter unit (S2) are connected with secondary windings (Ls1-Ls4) of the transformer (2), a first AC input terminal and a second AC input terminal are connected with opposed secondary windings for each single-phase three-level inverter unit; and for the other single-phase three-level inverter unit, the first AC input terminal and the second AC input terminal are connected with secondary windings which are crossed, thereby restricting application of the high voltage between the adjacent secondary windings.
Description
Technical field
The present invention relates to a kind of power inverter with the structure that single-phase three-level inverter (inverter) is connected in series.
Background technology
As this power inverter, for example known have following so high-voltage inverted apparatus: will have the single-phase inverter unit U1～U6 of forward type converter section and reverse type converter section, V1～V6, W1～W6 is connected in series a plurality of, forward type converter section to each single-phase inverter unit passes through two input transformer input AC electric power, and be accommodated in dish, in this high-voltage inverted apparatus, in the mode that can keep insulation distance ground freely to draw by the insulation supporter frame being located in dish, support each single-phase inverter unit, fixing from two input transformers the lead distribution of each single-phase inverter unit and the distribution between each single-phase inverter unit by the supporting above in dish, by the fixing optical cable as holding wire of insulation supporter frame supporting, wherein, the holding wire that described holding wire is the controller of the thyristor of each single-phase inverter unit of guiding control formation (for example, with reference to patent documentation 1).
As the single-phase inverter unit using in this high-voltage inverted apparatus, as shown in figure 11, be suitable for and have single-phase three-level inverter unit.This single-phase three-level inverter unit has direct current converter section 107, this direct current converter section 107 comprises the first forward converter 102 being connected with the first AC input terminal 101, the first smmothing capacitor 103 being connected with the outlet side of this first forward converter 102, the second forward converter 105 being connected with the second AC input terminal 104, the second smmothing capacitor 106 being connected with outlet side with this second forward converter 105.In this direct current converter section 107, by the first forward converter 102 and being connected in series of the second forward converter 105 and being connected in series of smmothing capacitor 103 and 106, from the series circuit of smmothing capacitor 103 and 106, derive high potential output line Lp, neutral dotted line Lm and electronegative potential output line Ln.
And the upper switch arm 109 that is connected in series with two switch elements is connected between high potential output line Lp and the first ac output end 108.In addition, the lower switch arm 110 that is connected in series with two switch elements is connected between the first ac output end 108 and electronegative potential output line Ln.And then diode 111 is connected between the connection mid point and neutral dotted line Lm of switch arm 109, diode 112 is connected between the connection mid point and neutral dotted line Lm of lower switch arm 110.
Similarly, the upper switch arm 115 that has an identical formation with upper switch arm 109 is connected between high potential output line Lp and the second ac output end 114.In addition, the lower switch arm 116 that has an identical formation with lower switch arm 110 is connected between the second ac output end 114 and electronegative potential output line Ln.And then diode 117 is connected between the connection mid point and neutral dotted line Lm of switch arm 115, diode 118 is connected between the connection mid point and neutral dotted line Lm of lower switch arm 116.
And, there is the single-phase three-level inverter cell S 1 of above-mentioned formation and S2 as shown in figure 12, it connects with following relation: a winding of transformer 120 is connected with AC power 119, the first AC input terminal 101 of S1 and the second AC input terminal 104 respectively with the secondary winding 121 of transformer 120,122 connect, the first AC input terminal 101 of S2 and the second AC input terminal 104 connect with the secondary winding 123,124 of transformer 120 respectively.In addition, the second ac output end 114 of single-phase three-level inverter cell S 1 and the first ac output end 108 of single-phase three-level inverter cell S 2 are connected.
[patent documentation 1] TOHKEMY 2006-254673 communique
But, in example under the prior art shown in Figure 11 and Figure 12, a winding of transformer 120 is connected with AC power 119, the first AC input terminal 101 of single-phase three-level inverter cell S 1 and S2 and the second AC input terminal 104 respectively with the secondary winding 121 of transformer 120, 122 and 123, 124 connect, therefore, when the voltage between terminals of above-mentioned smmothing capacitor 103 and 106 is made as to Edc, because the pattern of single-phase three-level inverter cell S 1 and S2 is applied to the high voltage that voltage between adjacent secondary winding reaches 4Edc sometimes, there is the problem that there is no as follows solution: between secondary winding, be necessary to guarantee the insulation corresponding with ceiling voltage, the size of transformer maximizes.
Summary of the invention
The present invention is directed to above-mentioned prior art example does not have the problem solving and puts forward, its object is, the situation that can suppress between adjacent secondary winding that high voltage is applied to the transformer that is connected with a plurality of single-phase three-level inverters unit is provided, makes insulation system simplify, make the power inverter of transformer miniaturization.
To achieve these goals, the power inverter that a mode of the present invention relates to comprises a plurality of N single-phase three-level inverter unit, above-mentioned single-phase three-level inverter unit has the first AC input terminal and second AC input terminal of input AC, and the first ac output end and the second ac output end that output single-phase exchanges are sub;
It has following structure: have the secondary winding of transformer and the first AC input terminal of above-mentioned N single-phase three-level inverter unit and the second ac input end sub-connection of a winding and a plurality of 2N secondary winding, ac output end of this N single-phase three-level inverter unit is connected in series.
And then, above-mentioned N the single-phase three-level inverter unit that above-mentioned ac output end is connected in series according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the secondary winding of above-mentioned transformer according to the locations of structures of the secondary winding of above-mentioned transformer be sequentially made as first secondary winding, second secondary winding, the 3rd secondary winding ..., a 2N-1 secondary winding, a 2N secondary winding.
And the annexation of the secondary winding of above-mentioned transformer and above-mentioned single-phase three-level inverter unit is:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, the integer that M is 1～N.As this method of attachment, there are the first method of attachment and the second method of attachment, select wherein any method.
In the first method of attachment, the unit that is odd number about M, makes the first ac input end sub-connection of 2M-1 secondary winding and unit, makes the second ac input end sub-connection of 2M secondary winding and unit.On the other hand, the unit that is even number about M, makes the second ac input end sub-connection of 2M-1 secondary winding and unit, makes the first ac input end sub-connection of 2M secondary winding and unit.
In the second method of attachment, the unit that is odd number about M, makes the second ac input end sub-connection of 2M-1 secondary winding and unit, makes the first ac input end sub-connection of 2M secondary winding and unit.On the other hand, the unit that is even number about M, makes the first ac input end sub-connection of 2M-1 secondary winding and unit, makes the second ac input end sub-connection of 2M secondary winding and unit.
In addition, form following power inverter: the first AC input terminal and second AC input terminal of single-phase three-level inverter unit with a plurality of N * K phase of above-mentioned formation is connected with the secondary winding of transformer with the secondary winding of a winding and a plurality of 2N * K phase, a side's separately of the K group circuit that ac output end of this N single-phase three-level inverter unit of K phase is connected in series lead-out terminal is connected jointly, and another lead-out terminal is made as to the high voltage that each exports K phase.
And then, above-mentioned N the single-phase three-level inverter unit that above-mentioned ac output end is connected jointly according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the locations of structures of the secondary winding of the K phase of above-mentioned transformer be sequentially made as respectively first secondary winding, second secondary winding, the 3rd secondary winding ..., a 2N-1 secondary winding, a 2N secondary winding.
And the annexation of the secondary winding of above-mentioned transformer and above-mentioned single-phase three-level inverter unit is:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, the integer that M is 1～N.As this method of attachment, there are the 3rd method of attachment and the 4th method of attachment, select wherein any method.
In the 3rd method of attachment, the unit that is odd number about M, makes the first ac input end sub-connection of 2M-1 secondary winding and unit, makes the second ac input end sub-connection of 2M secondary winding and unit.On the other hand, the unit that is even number about M, makes the second ac input end sub-connection of 2M-1 secondary winding and unit, makes the first ac input end sub-connection of 2M secondary winding and unit.
In the 4th method of attachment, the unit that is odd number about M, makes the second ac input end sub-connection of 2M-1 secondary winding and unit, makes the first ac input end sub-connection of 2M secondary winding and unit.On the other hand, the unit that is even number about M, makes the first ac input end sub-connection of 2M-1 secondary winding and unit, makes the second ac input end sub-connection of 2M secondary winding and unit.
Above-mentioned single-phase three-level inverter cell formation is as follows.That is, comprise the first forward converter that the alternating voltage from above-mentioned the first AC input terminal input is converted to direct current; Make the first level and smooth smmothing capacitor of output voltage of this forward converter; Alternating voltage from above-mentioned the second AC input terminal input is converted to the second forward converter of direct current; Second smmothing capacitor level and smooth with the output voltage that makes this forward converter, the low potential side of above-mentioned the first smmothing capacitor is connected with the hot side of the second smmothing capacitor, forms the DC series circuit with hot side, neutral point and low potential side.Between the hot side of this DC series circuit and the first ac output end, be connected with the upper arm that the parallel circuits of two thyristors and anti-paralleled diode is connected in series.In addition, between above-mentioned the first ac output end and above-mentioned low potential side, be connected with the underarm that the parallel circuits of two thyristors and anti-paralleled diode is connected in series.And then, between each intermediate connection points of two series circuits of above-mentioned each arm and above-mentioned neutral point, be connected with respectively diode.These upper arm and underarm and diode form the first output circuit.
On the other hand, two of the parallel circuitss of thyristor and anti-paralleled diode are connected in series to formation upper arm, this upper arm is connected between above-mentioned hot side and above-mentioned the second ac output end.And, two of the parallel circuitss of thyristor and anti-paralleled diode are connected in series to formation underarm, this underarm is connected between above-mentioned the second ac output end and above-mentioned low potential side.And then, diode is connected between each intermediate connection point and above-mentioned neutral point of two series circuits of above-mentioned each arm.These above-mentioned upper arm and underarm and diode form the second output circuit.
And, with the first forward converter, the second forward converter, the first smmothing capacitor, the second smmothing capacitor, the first output circuit, the second output circuit, form single-phase three-level inverter unit.
The following describes effect of the present invention
According to the present invention, as mentioned above, the AC input terminal of a plurality of single-phase three-level inverters unit is being connected, ac output end is connected in series and is produced in high-tension power inverter with the secondary side of transformer, by selecting any method in the first method of attachment and the second method of attachment, can suppress between adjacent secondary winding that high voltage is applied to transformer, insulation system is simplified, can be made transformer miniaturization.
Accompanying drawing explanation
Accompanying drawing explanation
Fig. 1 means the block diagram of the power inverter of first embodiment of the invention.
Fig. 2 means the circuit diagram of concrete formation of the single-phase three-level inverter unit of Fig. 1.
Fig. 3 means the block diagram of the power inverter in the situation of the connection identical with prior art example.
Fig. 4 means a side second lead-out terminal of single-phase three-level inverter unit of prior art example and the key diagram of the output potential of the first lead-out terminal of the opposing party combination.
Fig. 5 means with first of Fig. 3～three output potential and combines between corresponding unit input terminal the key diagram of voltage between voltage mode and each input terminal.
Fig. 6 means with the four～six output potential of Fig. 3 and combines between corresponding unit input terminal the key diagram of voltage between voltage mode and each input terminal.
Fig. 7 means with the seven～nine output potential of Fig. 3 and combines between corresponding unit input terminal the key diagram of voltage between voltage mode and each input terminal.
Fig. 8 means the block diagram of second embodiment of the invention.
Fig. 9 means the block diagram of third embodiment of the invention.
Figure 10 means the block diagram of four embodiment of the invention.
Figure 11 means the circuit diagram of the concrete formation of single-phase three-level inverter of the prior art unit.
Figure 12 means the block diagram of the power inverter of prior art example.
Description of symbols is as follows:
1 ... AC power,
2 ... transformer,
Lf ... a winding,
Ls1～Ls4 ... secondary winding,
S1, S2 ... single-phase three-level inverter unit,
11 ... the first AC input terminal,
12 ... the second AC input terminal,
13 ... the first AC input terminal,
14 ... the second AC input terminal,
15 ... the first ac output end,
16 ... the second ac output end,
17 ... the first ac output end,
18 ... the second ac output end,
21 ... the first forward converter,
22 ... the second forward converter,
23 ... the first smmothing capacitor,
24 ... the second smmothing capacitor,
25 ... direct current converter section,
Lp ... high potential side line,
Lm ... neutral dotted line,
Ln ... electronegative potential side line,
30 ... upper switch arm,
31,33 ... thyristor,
32,34 ... anti-paralleled diode,
36 ... lower switch arm,
37,39 ... thyristor,
38,40 ... anti-paralleled diode,
50 ... upper switch arm,
51,53 ... thyristor,
52,54 ... anti-paralleled diode,
56 ... lower switch arm,
57,59 ... thyristor,
58,60 ... anti-paralleled diode,
61～64 ... diode,
PT1 ... first-phase electric power converter section,
PT2 ... second-phase electric power converter section,
PT3 ... third phase electric power converter section,
Ls11～Ls14, Ls21～Ls24, Ls31～Ls34 ... secondary winding.
Embodiment
Embodiment of the present invention is described with reference to the accompanying drawings.At this, the circuit that exemplifies single-phase output describes.
Fig. 1 means the block diagram of the power inverter of first embodiment of the invention.In figure, 1 represents AC power, a winding L f of the alternating electromotive force input transformer 2 of exporting from this AC power 1.Secondary side at transformer 2 is provided with four secondary winding Ls1～Ls4.And the first single-phase three-level inverter cell S 1 is connected with Ls2 with secondary winding Ls1, the second single-phase three-level inverter cell S 2 is connected with Ls4 with secondary winding Ls3.
Single-phase three-level inverter cell S 1 comprises the first AC input terminal 11, the second AC input terminal 12, the first ac output end 15 and the second ac output end 16.In addition, single-phase three-level inverter cell S 2 comprises the first AC input terminal 13, the second AC input terminal 14, the first ac output end 17 and the second ac output end 18.
And the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is connected with the secondary winding Ls1 of transformer 2, the second AC input terminal 12 is connected with the secondary winding Ls2 of transformer 2.In addition, the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the secondary winding Ls4 of transformer, and the second AC input terminal 14 is connected with the secondary winding Ls3 of transformer.
And then the first ac output end 17 of second ac output end the 16 and second single-phase three-level inverter cell S 2 of the first single-phase three-level inverter cell S 1 is connected in series.
The first ac output end 15 of the first single-phase three-level inverter cell S 1 and the second ac output end 18 of the second single-phase three-level inverter cell S 2 are connected with single-phase loads such as thering is no illustrated motor (motor).
And each single-phase three-level inverter cell S 1 forms as shown in Figure 2.That is, the first AC input terminal 11 is connected with the first forward converter 21 that interchange is converted to direct current, and the second AC input terminal 12 is connected with the second forward converter 22 that interchange is converted to direct current.The first smmothing capacitor 23 is connected with the outlet side of the first forward converter 21, and the second smmothing capacitor 24 is connected with the outlet side of the second forward converter 22.
And the first forward converter 21 and the second forward converter 22 are connected in series, meanwhile, the first smmothing capacitor 23 and the second smmothing capacitor 24 are connected in series, and form direct current converter section 25.From this direct current converter section 25, specifically, from the anodal outlet side of the first forward converter 21 and the tie point of smmothing capacitor 23, derive high potential side line Lp, from the tie point of the first smmothing capacitor 23 and the second smmothing capacitor 24, derive neutral dotted line Lm, from the negative side of the second forward converter 22 and the tie point of the second smmothing capacitor 24, derive electronegative potential side line Ln.
And upper switch arm 30 is connected between high potential side line Lp and the first ac output end 15.On this, switch arm 30 has the parallel circuits that the thyristor being connected with high potential side line Lp 31 and anti-paralleled diode 32 are formed, and the structure that is connected in series of the parallel circuits that forms of thyristor 33 and anti-paralleled diode 34.
In addition, lower switch arm 36 is connected between the first ac output end 15 and electronegative potential side line Ln.This lower switch arm 36 has the parallel circuits forming with the first ac output end 15 thyristors that are connected 37 and anti-paralleled diode 38, and the structure that is connected in series of the parallel circuits of thyristor 39 and anti-paralleled diode 40 compositions.
And then upper switch arm 50 is connected between high potential side line Lp and the second ac output end 16.On this, switch arm 50 has the parallel circuits that the thyristor being connected with high potential side line Lp 51 and anti-paralleled diode 52 are formed, and the structure that is connected in series of the parallel circuits that forms of thyristor 53 and anti-paralleled diode 54.
And lower switch arm 56 is connected between the second ac output end 16 and electronegative potential side line Ln.This lower switch arm 56 has the parallel circuits forming with the second ac output end 16 thyristors that are connected 57 and anti-paralleled diode 58, and the structure that is connected in series of the parallel circuits of thyristor 59 and anti-paralleled diode 60 compositions.
And then diode 61 is connected between the tie point of parallel circuits of neutral dotted line Lm and upper switch arm 30, diode 62 is connected between the tie point of parallel circuits of neutral dotted line Lm and lower switch arm 36.
And diode 63 is connected between the tie point of parallel circuits of neutral dotted line Lm and upper switch arm 50, diode 64 is connected between the tie point of parallel circuits of neutral dotted line Lm and lower switch arm 56.In addition,, as thyristor, can be suitable for the switch elements such as IGBT (insulated gate bipolar transistor), power MOSFET (mos field effect transistor).
In addition, the second single-phase three-level inverter cell S 2 also has the formation identical with Fig. 2.
And, by the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 and first secondary winding Ls1 of transformer 2 are connected, the second AC input terminal 12 is connected with second secondary winding Ls2 of transformer, the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 and the 4th secondary winding Ls4 of transformer 2 are connected, the second AC input terminal 14 is connected with the 3rd secondary winding Ls3 of transformer 2, suppresses high voltage and be applied between the adjacent secondary winding of transformer 2.
, identical with Fig. 8 (Figure 12) of above-mentioned prior art example, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is connected with second secondary winding Ls2 with first secondary winding Ls1 of transformer 2 with the second AC input terminal 12, the 3rd secondary winding Ls3 of the first AC input terminal 13 that makes the second single-phase three-level inverter cell S 2 and the second AC input terminal 14 and transformer 2 is with in the 4th situation that secondary winding Ls4 is connected, according to the output potential combination of the pattern of the first single-phase three-level inverter cell S 1 and the second single-phase three-level inverter cell S 2, become 9 kinds shown in Fig. 4.That is,, when the output potential of the lead-out terminal 16 of the first single-phase three-level inverter cell S 1 is high potential P, the output potential of the lead-out terminal 17 of the second single-phase three-level inverter cell S 2 becomes these 3 kinds of high potential P, neutral potential M and electronegative potential N.Equally, when the output potential of the lead-out terminal 16 of the first single-phase three-level inverter cell S 1 is neutral potential M and during electronegative potential N, the output potential of the lead-out terminal 17 of the second single-phase three-level inverter cell S 2 also becomes these 3 kinds of high potential P, neutral potential M and electronegative potential N.
If the voltage between terminals of the first smmothing capacitor 23 and the second smmothing capacitor 24 is made as to Edc, when the output potential of the second ac output end 16 of the first single-phase three-level inverter cell S 1 is high potential P, between the input terminal of the single-phase three-level inverter unit of each combination of above-mentioned output potential, between voltage mode and input electronics, voltage becomes combination shown in Fig. 5 (a)～(c).
Now, when the output potential of the first lead-out terminal 17 of the second single-phase three-level inverter cell S 2 becomes in the situation of high potential P, become annexation shown in Fig. 5 (a), between input terminal, voltage is as follows: the voltage between terminals that input terminal is 11～13 becomes Edc, the voltage between terminals that input terminal is 11～14 becomes 2Edc, the voltage between terminals that input terminal is 12～13 becomes 2Edc, and the voltage between terminals that input terminal is 12～14 becomes Edc.
And, when the output potential of the lead-out terminal 17 of the second single-phase three-level inverter cell S 2 becomes neutral potential M, become annexation shown in Fig. 5 (b), between input terminal, voltage is as follows: the voltage between terminals that input terminal is 11～13 becomes 2Edc, the voltage between terminals that input terminal is 11～14 becomes Edc, the voltage between terminals that input terminal is 12～13 becomes 2Edc, and the voltage between terminals that input terminal is 12～14 becomes 2Edc.
And then, when the output potential of the lead-out terminal 17 of the second single-phase three-level inverter cell S 2 becomes electronegative potential N, become annexation shown in Fig. 5 (c), between input terminal, voltage is as follows: the voltage between terminals that input terminal is 11～13 becomes 3Edc, the voltage between terminals that input terminal is 11～14 becomes 2Edc, the voltage between terminals that input terminal is 12～13 becomes 4Edc, and the voltage between terminals that input terminal is 12～14 becomes 3Edc.
The combination of other current potentials is also as shown in Fig. 6 (a)～(c) and Fig. 7 (a)～(c), and result is, the situation that between input terminal, voltage maximum becomes 4Edc is only two kinds of the combinations of the combination of Fig. 5 (c) and Fig. 7 (a).
; in Fig. 5 (c); the second ac output end 16 that becomes the first single-phase three-level inverter cell S 1 is high potential P; the first ac output end 17 of the second single-phase three-level inverter cell S 2 is the combination of electronegative potential N, and between the input terminal that input terminal is at this moment 12～13, voltage becomes 4Edc.And, in Fig. 7 (a), the second lead-out terminal 16 that becomes the first single-phase three-level inverter cell S 1 is electronegative potential N, the first lead-out terminal 17 of the second single-phase three-level inverter cell S 2 is the combination of high potential P, and between the input terminal that input terminal is at this moment 11～14, voltage becomes ceiling voltage 4Edc.
At this, Fig. 7 (a) in the situation that, 11～14 of input terminals, if observe at the secondary winding place of transformer 2, between first secondary winding Ls1 and the 4th secondary winding Ls4, do not apply high voltage to adjacent secondary winding, therefore, no problem.But Fig. 5 (c) in the situation that, 12～13 of input terminals are adjacent, the secondary winding of transformer 2 also, between adjacent second secondary winding Ls2 and the 3rd secondary winding Ls3, is applied with high voltage.Therefore, must reach the proof voltage value corresponding with voltage between terminals 4Edc, need to guarantee high insulating properties, like this, the height of transformer 2 uprises, and causes maximizing.
Therefore, in the present embodiment, produce between the input terminal of maximum voltage between terminals 4Edc and have two kinds, between the actual input terminal that becomes problem, it is input terminal 12～13, therefore, by input terminal 13 is connected with the 4th secondary winding Ls4 of transformer 2, input terminal 14 is connected with the 3rd secondary winding Ls3, as shown in above-mentioned Fig. 5 (c), even if input terminal 12 and 13 s' voltage between terminals becomes 4Edc, also can prevent from being applied between adjacent secondary winding at transformer 2 side high voltages, voltage between terminals between adjacent secondary winding Ls2 and Ls3 can be suppressed to 3Edc from 4Edc.
Therefore, between the adjacent secondary winding of transformer 2, can reduce necessary proof voltage value, prevent that the height of transformer 2 from uprising, can make the overall structure miniaturization of power inverter.
In this first execution mode, the situation that is two to the single-phase three-level inverter unit being connected in series is illustrated, but, the present invention is not limited thereto, when the single-phase three-level inverter unit being connected in series is that N is individual, the secondary winding number of transformer 2 is 2N occasion, wherein N is positive integer, becomes following state.That is, the unit that is odd number about the M of the single-phase three-level inverter unit of M, makes the secondary winding of 2M-1 and the first ac input end sub-connection of single-phase three-level inverter unit.And, make the secondary winding of 2M and the second ac input end sub-connection of single-phase three-level inverter unit.On the other hand, the single-phase three-level inverter unit that is even number about M, makes the secondary winding of 2M-1 and the second ac input end sub-connection of single-phase three-level inverter unit.And, by making the secondary winding of M and the first ac input end sub-connection of single-phase three-level inverter unit, can implement the first method of attachment.
Below, with reference to Fig. 8, second embodiment of the invention is described.
In this second execution mode, contrary with above-mentioned the first execution mode, about the first single-phase three-level inverter cell S 1, the first AC input terminal 11 is connected with second secondary winding Ls2 of transformer 2, the second AC input terminal 12 is connected with first secondary winding Ls1 of transformer 2.On the other hand, for the second single-phase three-level inverter cell S 2, the first AC input terminal 13 is connected with the 3rd secondary winding Ls3 of transformer, the second AC input terminal 14 is connected with the 4th secondary winding Ls4 of transformer, be made as the second method of attachment.
According to this second execution mode, in the first single-phase three-level inverter cell S 1 side, to becoming the secondary winding of transformer 2 of the connecting object of the first AC input terminal 11 and the second AC input terminal 12, replace, therefore, identical with above-mentioned the first execution mode, between the input terminal of Fig. 5 (c), voltage becomes the input terminal 12 of 4Edc of peak and 13 connecting object, become secondary winding Ls1 and Ls3, can between adjacent secondary winding, not apply high voltage, can suppress proof voltage value, prevent that the height of transformer from uprising.
In this second execution mode, the situation that is two to the single-phase three-level inverter unit being connected in series is illustrated, but, the present invention is not limited thereto, when the single-phase three-level inverter unit being connected in series is that N is individual, the secondary winding number of transformer 2 is in the individual situation of 2N, wherein N is positive integer, becomes following state.That is, the unit that is odd number about the M of the single-phase three-level inverter unit of M, makes the secondary winding of 2M-1 and the second ac input end sub-connection of single-phase three-level inverter unit.And, make the secondary winding of 2M and the first ac input end sub-connection of single-phase three-level inverter unit.On the other hand, the single-phase three-level inverter unit that is even number about M, makes the secondary winding of 2M-1 and the first ac input end sub-connection of single-phase three-level inverter unit.And, by making the secondary winding of M and the second ac input end sub-connection of single-phase three-level inverter unit, can implement the second method of attachment.
Below, with reference to Fig. 9, third embodiment of the invention is described.
In the 3rd execution mode, be provided with the single-phase three-level inverter unit of a plurality of N * K phase, represent the circuit of N=2, K=3.
; in the 3rd execution mode; power inverter as shown in Figure 9; be provided with first-phase electric power converter section PT1; second-phase electric power converter section PT2; with third phase electric power converter section PT3, amount to three electric power converter sections, each power converting section does not comprise single-phase three-level inverter cell S 1 and the S2 of the first execution mode.
And, for first-phase electric power converter section PT1, identical with above-mentioned the first execution mode, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is connected with the secondary winding Ls11 of transformer 2, and the second AC input terminal 12 is connected with the secondary winding Ls12 of transformer 2.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the secondary winding Ls14 of transformer, the second AC input terminal 14 is connected with the secondary winding Ls13 of transformer.
Similarly, for second-phase electric power converter section PT2, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is also connected with the secondary winding Ls21 of transformer 2, and the second AC input terminal 12 is also connected with the secondary winding Ls22 of transformer 2.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the secondary winding Ls24 of transformer, the second AC input terminal 14 is connected with the secondary winding Ls23 of transformer.
And then for third phase electric power converter section PT3, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is also connected with the secondary winding Ls31 of transformer 2, the second AC input terminal 12 is also connected with the secondary winding Ls32 of transformer 2.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the secondary winding Ls34 of transformer, the second AC input terminal 14 is connected with the secondary winding Ls33 of transformer.
And then, the second lead-out terminal 16 of the first single-phase three-level inverter cell S 1 of each electric power converter section PT1～PT3 is connected with the first lead-out terminal 17 of the second single-phase three-level inverter cell S 2, and the second lead-out terminal 18 of the second single-phase three-level inverter cell S 2 of each electric power converter section PT1～PT3 is common connection mutually.
And the first lead-out terminal 15 of the first single-phase three-level inverter cell S 1 of each electric power converter section PT1～PT3 is connected with threephase loads such as thering is no illustrated threephase motor.
According to the 3rd execution mode, each electric power converter section PT1～PT3 has identical formation with above-mentioned the first execution mode, therefore can access the action effect identical with above-mentioned the first execution mode.
In the above-described 3rd embodiment, about each electric power converter section PT1～PT3, identical with above-mentioned the first execution mode, the single-phase three-level inverter unit being connected in series can be made as N, wherein N is positive integer, and the secondary winding number of transformer 2 can be made as 2N, implements the first method of attachment.
And in the above-described 3rd embodiment, the situation that is three-phase to the number of phases is illustrated, still, the present invention is not limited thereto, also can be for four mutually or four above any numbers of phases mutually.
Below, with reference to Figure 10, four embodiment of the invention is described.
The 4th execution mode is identical with above-mentioned the 3rd execution mode, is provided with the single-phase three-level inverter unit of a plurality of N * K phase, represents the circuit of N=2, K=3.
; in the 4th execution mode; power inverter as shown in figure 10; identical with above-mentioned the 3rd execution mode; be provided with first-phase electric power converter section PT1, second-phase electric power converter section PT2, and third phase electric power converter section PT3; amount to three electric power converter sections, each power converting section does not comprise single-phase three-level inverter cell S 1 and the S2 of the first execution mode.
And, for first-phase electric power converter section PT1, identical with above-mentioned the second execution mode, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is connected with second secondary winding Ls12 of transformer 2, and the second AC input terminal 12 is connected with first secondary winding Ls11 of transformer 2.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the 3rd secondary winding Ls13 of transformer, the second AC input terminal 14 is connected with the 4th secondary winding Ls14 of transformer.
Equally, for second-phase electric power converter section PT2, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is also connected with the 6th secondary winding Ls22 of transformer 2, and the second AC input terminal 12 is also connected with the 5th secondary winding Ls21 of transformer.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the 7th secondary winding Ls23 of transformer, the second AC input terminal 14 is connected with the 8th secondary winding Ls24 of transformer.
And then, for third phase electric power converter section PT3, the first AC input terminal 11 of the first single-phase three-level inverter cell S 1 is also connected with the tenth secondary winding Ls32 of transformer 2, and the second AC input terminal 12 is also connected with the 9th secondary winding Ls31 of transformer.And the first AC input terminal 13 of the second single-phase three-level inverter cell S 2 is connected with the 11 secondary winding Ls33 of transformer, the second AC input terminal 14 is connected with the 12 secondary winding Ls34 of transformer.
And then, the second lead-out terminal 16 of the first single-phase three-level inverter cell S 1 of each electric power converter section PT1～PT3 is connected with the first lead-out terminal 17 of the second single-phase three-level inverter cell S 2, and the second lead-out terminal 18 of the second single-phase three-level inverter cell S 2 of each electric power converter section PT1～PT3 is common connection mutually.
And the first lead-out terminal 15 of the first single-phase three-level inverter cell S 1 of each electric power converter section PT1～PT3 is connected with threephase loads such as thering is no illustrated threephase motor.
According to the 4th execution mode, each electric power converter section PT1～PT3 has identical formation with above-mentioned the second execution mode, therefore can access the action effect identical with above-mentioned the second execution mode.
In the above-described 4th embodiment, for each electric power converter section PT1～PT3, identical with above-mentioned the first execution mode, the single-phase three-level inverter unit being connected in series can be made as N, wherein N is positive integer, and the secondary winding number of transformer 2 can be made as 2N, implements the second method of attachment.
And in the above-described 4th embodiment, the situation that is three-phase to the number of phases is illustrated, still, the present invention is not limited thereto, also can be for four mutually or four above any numbers of phases mutually.
And, the formation of single-phase three-level inverter unit is not limited to above-mentioned formation, on each, the thyristor number of switch arm and lower switch arm can be set as any even number, and also can be suitable for the switching circuit that carries out conducting control while wishing, replaces diode 61～64.
Above with reference to accompanying drawing, embodiments of the invention have been described, but the present invention is not limited to above-described embodiment.In the technology of the present invention thought range, can do all changes, they all belong to protection scope of the present invention.
Claims (5)
1. a power inverter, is characterized in that:
This power inverter comprises a plurality of N single-phase three-level inverter unit, described single-phase three-level inverter unit has the first AC input terminal and second AC input terminal of input AC, and the first ac output end and the second ac output end that output single-phase exchanges are sub
The secondary winding of transformer and the first AC input terminal of described N single-phase three-level inverter unit and the second ac input end sub-connection with a winding and a plurality of 2N secondary winding, ac output end of this N single-phase three-level inverter unit is connected in series
Described single-phase three-level inverter unit comprises the first forward converter and the second forward converter being connected in series, described the first forward converter and described the first ac input end sub-connection, described the second forward converter and described the second ac input end sub-connection
Described N the single-phase three-level inverter unit that described ac output end is connected in series according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the secondary winding of described transformer according to the locations of structures of the secondary winding of described transformer be sequentially made as first secondary winding, second secondary winding, the 3rd secondary winding ..., during a 2N-1 secondary winding, 2N secondary winding, the annexation of the secondary winding of described transformer and described single-phase three-level inverter unit is as follows:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, M is the integer of 1～N, as this method of attachment, the unit that is odd number about M, make the first ac input end sub-connection of 2M-1 secondary winding and unit, make the second ac input end sub-connection of 2M secondary winding and unit, the unit that is even number about M, make the second ac input end sub-connection of 2M-1 secondary winding and unit, make the first ac input end sub-connection of 2M secondary winding and unit.
2. a power inverter, is characterized in that:
This power inverter comprises a plurality of N single-phase three-level inverter unit, described single-phase three-level inverter unit has the first AC input terminal and second AC input terminal of input AC, and the first ac output end and the second ac output end that output single-phase exchanges are sub
The secondary winding of transformer and the first AC input terminal of described N single-phase three-level inverter unit and the second ac input end sub-connection with a winding and a plurality of 2N secondary winding, ac output end of this N single-phase three-level inverter unit is connected in series
Described single-phase three-level inverter unit comprises the first forward converter and the second forward converter being connected in series, described the first forward converter and described the first ac input end sub-connection, described the second forward converter and described the second ac input end sub-connection
Described N the single-phase three-level inverter unit that described ac output end is connected in series according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the secondary winding of described transformer according to the locations of structures of the secondary winding of described transformer be sequentially made as first secondary winding, second secondary winding, the 3rd secondary winding ..., during a 2N-1 secondary winding, 2N secondary winding, the annexation of the secondary winding of described transformer and described single-phase three-level inverter unit is as follows:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, M is the integer of 1～N, as this method of attachment, the unit that is odd number about M, make the second ac input end sub-connection of 2M-1 secondary winding and unit, make the first ac input end sub-connection of 2M secondary winding and unit, the unit that is even number about M, make the first ac input end sub-connection of 2M-1 secondary winding and unit, make the second ac input end sub-connection of 2M secondary winding and unit.
3. a power inverter, is characterized in that:
This power inverter comprises the single-phase three-level inverter unit of a plurality of N * K phase, described single-phase three-level inverter unit has the first AC input terminal and second AC input terminal of input AC, and the first ac output end and the second ac output end that output single-phase exchanges are sub
Have a winding and a plurality of 2N * K secondary winding transformer K phase secondary winding respectively with the first AC input terminal and the second ac input end sub-connection of described N single-phase three-level inverter unit, a lead-out terminal separately of the K group circuit that ac output end of this N single-phase three-level inverter unit is connected in series is connected jointly, and another lead-out terminal is made as to each output to carry out K and exports mutually
Described single-phase three-level inverter unit comprises the first forward converter and the second forward converter being connected in series, described the first forward converter and described the first ac input end sub-connection, described the second forward converter and described the second ac input end sub-connection
Described N the single-phase three-level inverter unit that described ac output end is connected jointly according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the locations of structures of the secondary winding of the K phase of described transformer be sequentially made as respectively first secondary winding, second secondary winding, the 3rd secondary winding ..., during a 2N-1 secondary winding, 2N secondary winding, the annexation of the secondary winding of described transformer and described single-phase three-level inverter unit is as follows:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, M is the integer of 1～N, as this method of attachment, the unit that is odd number about M, make the first ac input end sub-connection of 2M-1 secondary winding and unit, make the second ac input end sub-connection of 2M secondary winding and unit, the unit that is even number about M, make the second ac input end sub-connection of 2M-1 secondary winding and unit, make the first ac input end sub-connection of 2M secondary winding and unit.
4. a power inverter, is characterized in that:
This power inverter comprises the single-phase three-level inverter unit of a plurality of N * K phase, described single-phase three-level inverter unit has the first AC input terminal and second AC input terminal of input AC, and the first ac output end and the second ac output end that output single-phase exchanges are sub
Have a winding and a plurality of 2N * K secondary winding transformer K phase secondary winding respectively with the first AC input terminal and the second ac input end sub-connection of described N single-phase three-level inverter unit, a lead-out terminal separately of the K group circuit that ac output end of this N single-phase three-level inverter unit is connected in series is connected jointly, and another lead-out terminal is made as to each output to carry out K and exports mutually
Described single-phase three-level inverter unit comprises the first forward converter and the second forward converter being connected in series, described the first forward converter and described the first ac input end sub-connection, described the second forward converter and described the second ac input end sub-connection
Described N the single-phase three-level inverter unit that described ac output end is connected jointly according to the order of connection be made as first module, second unit, Unit the 3rd ..., N unit, by the locations of structures of the secondary winding of the K phase of described transformer be sequentially made as respectively first secondary winding, second secondary winding, the 3rd secondary winding ..., during a 2N-1 secondary winding, 2N secondary winding, the annexation of the secondary winding of described transformer and described single-phase three-level inverter unit is as follows:
Make two ac input end sub-connections of 2M-1 secondary winding and 2M secondary winding and M unit, wherein, M is the integer of 1～N, as this method of attachment, the unit that is odd number about M, make the second ac input end sub-connection of 2M-1 secondary winding and unit, make the first ac input end sub-connection of 2M secondary winding and unit, the unit that is even number about M, make the first ac input end sub-connection of 2M-1 secondary winding and unit, make the second ac input end sub-connection of 2M secondary winding and unit.
5. as the power inverter as described in any in claim 1～4, it is characterized in that:
Described the first forward converter will be converted to direct current from the alternating voltage of described the first AC input terminal input, and described the second forward converter will be converted to direct current from the alternating voltage of described the second AC input terminal input,
Described single-phase three-level inverter unit also comprises: the first level and smooth smmothing capacitor of output voltage that makes this forward converter; Second smmothing capacitor level and smooth with the output voltage that makes this forward converter,
The low potential side of described the first smmothing capacitor is connected with the hot side of the second smmothing capacitor, forms the DC series circuit with hot side, neutral point and low potential side,
Described single-phase three-level inverter unit also comprises:
The first output circuit, it comprises: the upper arm that is connected in series with the parallel circuits of two thyristors and anti-paralleled diode between the hot side of described DC series circuit and described the first ac output end, between described the first ac output end and described low potential side, be connected in series with the underarm of the parallel circuits of two thyristors and anti-paralleled diode, and the diode connecting respectively between each intermediate connection points of two series circuits of described each arm and described neutral point, and
The second output circuit, it comprises: the upper arm that is connected in series with the parallel circuits of two thyristors and anti-paralleled diode between described hot side and described the second ac output end, between described the second ac output end and described low potential side, be connected in series with the underarm of the parallel circuits of two thyristors and anti-paralleled diode, and the diode connecting respectively between each intermediate connection points of two series circuits of described each arm and described neutral point.
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| JP5855891B2 (en) * | 2011-10-07 | 2016-02-09 | 東芝三菱電機産業システム株式会社 | Power converter |
| JP6119458B2 (en) * | 2013-06-25 | 2017-04-26 | 富士電機株式会社 | Power converter |
| JP6385056B2 (en) * | 2013-12-25 | 2018-09-05 | 川崎重工業株式会社 | Power converter control method and power converter |
| CN106688170B (en) * | 2014-09-11 | 2020-03-13 | 飞利浦照明控股有限公司 | Charge pump effect compensation for high frequency isolation transformers in lighting device power supplies |
| CN112671256B (en) * | 2020-12-26 | 2023-12-15 | 张卓凡 | Transformer integrated multi-level battery energy storage power conversion device |
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| JP4581761B2 (en) * | 2005-03-14 | 2010-11-17 | 株式会社明電舎 | High voltage inverter device |
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| 《高频开关电源功率变压器线圈优化设计技术》;毛行奎等;《电气应用》;20051231;第24卷(第2期);77-79，85 * |
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