JP7119483B2 - power generation system - Google Patents

Description

The present invention relates to power generation systems.

Patent Document 1 below discloses a power generation system that converts the power generated by a single rotating electric machine (generator) into power by a single power converter and supplies it to a load such as a battery or power system. .

By the way, in order to mount a power generation system on a vehicle, an aircraft, or the like, it becomes an important problem how to reduce the size of the power generation system.

Japanese Unexamined Patent Application Publication No. 2004-40987

Accordingly, the inventor has come up with the idea of connecting a plurality of power converters in parallel and downsizing each of the power converters connected in parallel to reduce the size of the entire power generation system.

However, when the power converters are connected in parallel, it is necessary to divide the electric power generated by the single rotating electric machine and supply it to each power converter. It is necessary to suppress the cross current between the split paths. Therefore, simply connecting the power converters in parallel limits the size reduction of the power generation system, and it is difficult to further reduce the size of the power generation system.

The present invention has been made in view of such circumstances, and its object is to provide a power generation system in which power of a single rotating electric machine is converted by a plurality of power converters connected in parallel with each other. It is downsizing.

According to one aspect of the present invention, a single rotating electric machine in which a plurality of winding groups each having multiphase windings connected thereto are provided independently of each other and connected in parallel to each other to convert power of the rotating electric machine and a plurality of power converters, wherein one or more of the power converters are electrically connected to each of the winding groups.

One aspect of the present invention is the power generation system described above, in which the number of power converters is N (N≧2) and the number of winding groups is M (M≧2), the windings The number of said power converters connected to each of the groups is (N/M).

One aspect of the present invention is the power generation system described above, wherein N and M are the same number.

One aspect of the present invention is the power generation system described above, wherein the number of power converters is N (N≧2) and the number of winding groups is M (M≧2), The number of winding groups connected to each of the units is (M/N), which is two or more.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to reduce the size of a power generation system in which power of a single rotating electric machine is converted by a plurality of power converters connected in parallel with each other.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of schematic structure of the electric power generation system which concerns on 1st Embodiment. 1 is a diagram showing a configuration of a power generation system 100 using a conventional power generator 110; FIG. It is a figure which shows an example of schematic structure of the electric power generation system which concerns on 2nd Embodiment. It is a figure which shows an example of schematic structure of the electric power generation system which concerns on 3rd Embodiment.

A power generation system according to an embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings, the same or similar parts may be denoted by the same reference numerals, and duplicate description may be omitted. Also, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

(First embodiment)
FIG. 1 is a diagram showing an example of a schematic configuration of a power generation system according to a first embodiment. As shown in FIG. 1 , the power generation system A includes a generator 1 and a power conversion device 2 .

The generator 1 is one of rotating electric machines, and is an AC generator that generates electric power (hereinafter referred to as “generated power”) by being rotationally driven by renewable energy, a steam turbine, or the like.

In this generator 1, a plurality of winding groups 11 (11-1, 11-2, . It is Here, "independent" means a state of being electrically insulated from each other. The configuration of the generator 1 of the present invention will be specifically described below. . . , 11-M are simply referred to as "winding group 11" when they are not distinguished from each other.

The generator 1 includes a stator on which M winding groups 11 are wound independently, and a rotor provided to be rotatable relative to the stator. That is, in the generator 1, windings wound around the stator are divided into M winding groups 11 and multiplexed.

Each winding group 11 includes polyphase windings (hereinafter “polyphase windings”) 12 . In this embodiment, the number of phases of the multiphase winding 12 is three, but the present embodiment is not limited to this, and may have multiple phases other than three.

Each winding group 11 includes a U-phase winding 12u that is a U-phase winding, a V-phase winding 12v that is a V-phase winding, and a W-phase winding 12w that is a W-phase winding. The U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w are connected in a star connection.

Specifically, one ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w are connected to the neutral point P, respectively. Further, the other ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12 are connected to the power converter 2, respectively.

The power conversion device 2 converts AC power generated by the generator 1 into DC power, and supplies the DC power to the load F. This load F may be a power supply device or an electric power system.

The power conversion device 2 according to this embodiment will be specifically described below.

The power converter 2 includes N power converters 21 (21-1, 21-2, . . . , 21-N (N: an integer equal to or greater than 2)). Note that when the N power converters 21-1, 21-2, . For example, power converter 21 is a converter.

Each power converter 21 is provided corresponding to each winding group 11-1, 11-2, . . . , 11-M. Specifically, in the first embodiment, the power converter 2 includes the same number (N=M) of power converters 21-1, 21 as the winding groups 11-1, 11-2, . . . , 11-M. -2, . . . , 21-N, and each winding group 11-1, 11-2, . are electrically connected at

The power converter 21-1 is electrically connected to the other ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w in the winding group 11-1. The power converter 21-1 generates power generated in the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w of the winding group 11-1 as the rotor of the generator 1 rotates. It converts the electric power into direct current and supplies it to the load F.

The power converter 21-2 is electrically connected to the other ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w in the winding group 11-2. Power converter 21-2 generates power generated in U-phase winding 12u, V-phase winding 12v, and W-phase winding 12w of winding group 11-2 as the rotor of generator 1 rotates. It converts the electric power into direct current and supplies it to the load F.

The power converter 21-N is electrically connected to the other ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w in the winding group 11-M. Then, the power converter 21-N generates power generated in the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w of the winding group 11-M as the rotor of the generator 1 rotates. It converts the electric power into direct current and supplies it to the load F.

Next, effects of the configuration of the power generation system according to the first embodiment will be described. FIG. 2 is a diagram showing the configuration of a power generation system 100 using a conventional generator 110. As shown in FIG.

In the power generation system 100 of FIG. 2, the power generated by the single power generator 110 is converted into direct current by the plurality of power converters 120 and supplied to the load F. The phase windings 12u of the power generator 1, By branching the power transmission paths from each of the V-phase winding 12v and the W-phase winding 12w to each power converter 120, generated power is distributed to each power converter 120 connected in parallel.

In the above-described power distribution by branching of the power transmission paths, due to differences in the resistance value, inductance value, etc. due to the path length of each power transmission path and the individual differences of each power converter 120, cross currents flow between the power transmission paths after branching. flows. Therefore, in order to suppress the cross current, each of the branched power transmission paths requires a reactor 130 large enough to ignore the individual difference. However, the addition of this reactor 130 prevents further miniaturization of the power generation system 100 .

On the other hand, the power generation system A according to the first embodiment includes the same number of independent multiphase windings 12 (winding group 11 −1, 11-2, . . . , 11-M (M=N)).

. . , 21-N from the phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w of the generator 1 to the power converters 21-1, 21-2, . No need to branch. Therefore, no cross-current flows, and the reactor 130 need not be provided. Therefore, the power generation system A can be made smaller and lighter than the power generation system 100 . Furthermore, even if a failure such as disconnection occurs in one of the multiphase windings 12, it is possible to generate power with an independent multiphase winding 12 that is different from the multiphase winding 12 in which the failure occurred. This makes it possible to improve redundancy and reliability.

(Second embodiment)
A power generation system B according to the second embodiment will be described below with reference to FIG.
FIG. 3 is a diagram showing an example of a schematic configuration of a power generation system B according to the second embodiment. As shown in FIG. 3 , the power generation system B includes a generator 1 , a power conversion device 2B, and multiple reactors 3 .

The power converter 2B includes N power converters 21B (21B-1, 21B-2, . . . , 21B-N).

Two power converters 21B are provided for each of the winding groups 11-1, 11-2, . . . , 11-M. Specifically, in the second embodiment, the power conversion device 2 is a power converter having twice the number of winding groups 11-1, 11-2, . . . , 11-M (N=2×M). , 21B-1, 21B-2, . . . , 21B-N, winding groups 11-1, 11-2, . and are electrically connected at a ratio of 1:2.

Specifically, the power transmission path Wu from the other end of the U-phase winding 12u in the winding group 11-1 branches into branch paths W1 and W2 at the branch point Su, and the branch path W1 is connected to the power converter 21B-. 1, and the branch path W2 is connected to the power converter 21B-2.
Further, the power transmission path Wv from the other end of the V-phase winding 12v in the winding group 11-1 branches into branch paths W3 and W4 at the branch point Sv, and the branch path W3 is connected to the power converter 21B-1. , and the branch path W4 is connected to the power converter 21B-2.
Further, the power transmission path Ww from the other end of the W-phase winding 12w in the winding group 11-1 branches into branch paths W5 and W6 at the branch point Sw, and the branch path W5 is connected to the power converter 21B-1. , and the branch path W6 is connected to the power converter 21B-2.

A power transmission path Wu from the other end of the U-phase winding 12u in the winding group 11-2 branches into branch paths W7 and W8 at a branch point Su, and the branch path W7 is connected to the power converter 21B-3. , the branch path W8 is connected to the power converter 21B-4.
Further, the power transmission path Wv from the other end of the V-phase winding 12v in the winding group 11-2 branches into branch paths W9 and W10 at the branch point Sv, and the branch path W9 is connected to the power converter 21B-3. , and the transmission path W10 is connected to the power converter 21B-4.
Further, the power transmission path Ww from the other end of the W-phase winding 12w in the winding group 11-2 branches into branch paths W11 and W12 at the branch point Sw, and the branch path W11 is connected to the power converter 21B-3. , and the branch path W12 is connected to the power converter 21B-4.

A power transmission path Wu from the other end of the U-phase winding 12u in the winding group 11-M branches into branch paths W13 and W14 at a branch point Su, and the branch path W13 is connected to the power converter 21B-(N-1 ), and the branch path W14 is connected to the power converter 21B-N.
Further, the power transmission path Wv from the other end of the V-phase winding 12v in the winding group 11-M branches into branch paths W15 and W16 at the branch point Sv, and the branch path W15 is the power converter 21B-(N -1), and the transmission path W16 is connected to the power converter 21B-N.
Further, the power transmission path Ww from the other end of the W-phase winding 12w in the winding group 11-M branches into branch paths W17 and W18 at the branch point Sw, and the branch path W17 is the power converter 21B-(N -1), and the branch path W18 is connected to the power converter 21B-N.

Reactors 3 are provided in all branch paths W1 to W18. That is, reactors 3 are provided in all the branch paths of the power transmission path between each winding group 11 and each power converter 21B. Then, the reactor 3 suppresses cross currents between the branch paths W1 to W18.

In the second embodiment, the number N of power converters 21B-1, 21B-2, . Although the case of the double value ((N/M)=2) has been described, the present invention is not limited to this. For example, the value of (N/M) should be 2 or more.

As described above, in the power generation system B according to the second embodiment, the number of power converters 21B connected in parallel is N (N≧2), and the number of winding groups 11 is M (M≧2). In the case, the number of power converters 21B connected to each winding group 11 is (N/M) and is two or more.

With such a configuration, each power converter 21B can be made smaller than before, so that the entire power generation system B can be made smaller. In addition, the degree of freedom of arrangement (degree of design freedom) of each power converter 21B connected in parallel can be improved. Furthermore, even if a failure such as disconnection occurs in one of the multiphase windings 12, it is possible to generate power with an independent multiphase winding 12 that is different from the multiphase winding 12 in which the failure occurred. This makes it possible to improve redundancy and reliability.

(Third embodiment)
A power generation system C according to the third embodiment will be described below with reference to FIG.
FIG. 4 is a diagram showing an example of a schematic configuration of a power generation system C according to the third embodiment. As shown in FIG. 4 , the power generation system C includes a power generator 1C and a power conversion device 2 .

The generator 1C is provided with a plurality of winding groups 11C (11C-1, 11C-2, . ing. The configuration of the generator 1 of the present invention will be specifically described below. . . , 11C-M are simply referred to as "winding group 11C".

The generator 1C includes a stator around which M winding groups 11 are wound independently, and a rotor provided rotatably relative to the stator. That is, in the generator 1, windings wound around the stator are divided into M winding groups 11C and multiplexed.

Each winding group 11</b>C includes polyphase windings (hereinafter referred to as “polyphase windings”) 12 . In this embodiment, the number of phases of the multiphase winding 12 is three, but the present embodiment is not limited to this, and may have multiple phases other than three.

Each winding group 11C includes a U-phase winding 12u, a V-phase winding 12v, and a W-phase winding 12w. The U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w are connected in a star connection.

Specifically, one ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w are connected to the neutral point P, respectively. Further, the other ends of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12 are connected to the power converter 2, respectively.

The power converter 2 includes N power converters 21 (21-1, 21-2, . . . , 21-N (N: an integer equal to or greater than 2)). Note that when the N power converters 21-1, 21-2, . For example, power converter 21 is a converter.

In the third embodiment, the power converter 2 includes power converters 21-1, 21-2 whose number N is half the number M of the winding groups 11-1, 11-2, . . . , 11-M. , . . , 21-N, and each winding group 11-1, 11-2, . properly connected.

Specifically, power converter 21-1 connects the other end of U-phase winding 12u of winding group 11-1 and the other end of U-phase winding 12u of winding group 11-2, respectively. It is connected. Further, power converter 21-1 is connected to the other end of V-phase winding 12v of winding group 11-1 and the other end of V-phase winding 12v of winding group 11-2. there is Furthermore, power converter 21-1 is connected to the other end of W-phase winding 12w of winding group 11-1 and the other end of W-phase winding 12w of winding group 11-2. there is

Specifically, power converter 21-2 connects the other end of U-phase winding 12u of winding group 11-3 and the other end of U-phase winding 12u of winding group 11-4, respectively. It is connected. Power converter 21-2 is connected to the other end of V-phase winding 12v of winding group 11-3 and the other end of V-phase winding 12v of winding group 11-4. there is Further, power converter 21-2 is connected to the other end of W-phase winding 12w of winding group 11-3 and the other end of W-phase winding 12w of winding group 11-4. there is

Specifically, the power converter 21-M connects the other end of the U-phase winding 12u of the winding group 11-(M−1) and the other end of the U-phase winding 12u of the winding group 11-M. , respectively. Further, the power converter 21-M connects the other end of the V-phase winding 12v of the winding group 11-(M−1) and the other end of the V-phase winding 12v of the winding group 11-M. It is connected to the. Further, the power converter 21-M connects the other end of the W-phase winding 12w of the winding group 11-(M−1) and the other end of the W-phase winding 12w of the winding group 11-M. It is connected to the.

In the third embodiment, the case where the number of winding groups 11 connected to each of the power converters 21 is two has been described, but the present invention is not limited to this. It suffices that the number of winding groups 11 provided is two or more. That is, the number of winding groups 11 connected to each of power converters 21 is (M/N), which is two or more. However, both N and M are 2 or more.

As described above, in the power generation system C according to the third embodiment, the number of power converters 21 connected in parallel is N (N≧2), and the number of winding groups 11 is M (M≧2). In the case, the number of winding groups connected to each of the power converters 21 is (M/N), which is two or more.

With such a configuration, no cross current is generated, and the reactor 130 need not be provided. Therefore, the power generation system C can be further reduced in size and weight. Furthermore, even if a failure such as disconnection occurs in one of the multiphase windings 12, it is possible to generate power with an independent multiphase winding 12 that is different from the multiphase winding 12 in which the failure occurred. This makes it possible to improve redundancy and reliability.

As described above, the power generation systems in the first to third embodiments are a single rotating electric machine (generator and a plurality of power converters connected in parallel to each other to convert power of the rotating electric machine, and one or more power converters are electrically connected to each of the winding groups. there is

With such a configuration, it is possible to reduce the size of the power generation system in which the power of a single rotating electric machine is converted by a plurality of power converters connected in parallel with each other.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and designs and the like are included within the scope of the gist of the present invention.

A, B, C Power generation systems 1, 1C Generators 2, 2B Power converters 11, 11C Winding group 12 Multiphase windings 21, 21B Power converter

Claims (2)

a single rotating electric machine in which a plurality of winding groups each having multiphase windings connected thereto are provided independently of each other;
a plurality of power converters connected in parallel to each other and converting power of the rotating electric machine;
with
One or more of the power converters are electrically connected to each of the winding groups,
The number of power converters is N (N≧2),
The number M of the winding groups is an integer multiple of N equal to or greater than 2,
The power generation system , wherein the number of winding groups connected to each of the power converters is (M/N) . a single rotating electric machine in which a plurality of winding groups each having multiphase windings connected thereto are provided independently of each other;
a plurality of power converters connected in parallel to each other and converting power of the rotating electric machine;
with
One or more of the power converters are electrically connected to each of the winding groups,
The number of winding groups is M (M≧2),
The number N of the power converters is an integer multiple of M equal to or greater than 2,
The number of power converters connected to each of the winding groups is (N/M)
A power generation system characterized by:

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