CN211183416U - Rectification and composite energy storage integrated direct current power generation system - Google Patents
Rectification and composite energy storage integrated direct current power generation system Download PDFInfo
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- CN211183416U CN211183416U CN202020031506.XU CN202020031506U CN211183416U CN 211183416 U CN211183416 U CN 211183416U CN 202020031506 U CN202020031506 U CN 202020031506U CN 211183416 U CN211183416 U CN 211183416U
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Abstract
The utility model discloses a rectification and compound energy storage integration direct current power generation system, include: the multi-level rectifier comprises an alternating current generator set and a composite energy storage type modular multi-level rectifier, wherein the composite energy storage type modular multi-level rectifier comprises m-phase circuits, each phase circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm is formed by sequentially connecting the output ends of n energy storage sub-modules in series and then connecting bridge arm reactors in series, and the lower bridge arm is formed by sequentially connecting bridge arm reactors in series with the output ends of the n energy storage sub-modules; the upper end of an upper bridge arm of each phase circuit is connected with the positive pole of a direct current power grid, the lower end of a lower bridge arm of each phase circuit is connected with the negative pole of the direct current power grid, the lower end of the upper bridge arm of each phase circuit is connected with the upper end of the lower bridge arm to form an alternating current output end of the phase, the alternating current output ends of m phase circuits are connected with the output end of an alternating current generator set, and m and n are positive integers. The system is flexible in control and high in integration level, and is suitable for occasions such as direct-current micro-grids, ship medium-voltage direct-current comprehensive power systems and the like.
Description
Technical Field
The utility model relates to a naval vessel middling pressure direct current synthesizes electric power system technical field, in particular to direct current power generation system who has rectification and compound energy storage function simultaneously.
Background
With the rapid development of power electronic technology, the direct current power distribution is more and more widely valued and applied due to the advantages of power density, electric energy quality and the like, such as regional power distribution networks, micro-grids, ship integrated power systems and the like. In order to meet the direct current power generation requirement in the medium-voltage direct current integrated power system of the ship, a diesel generator or a turbine generator and a rectifying device are generally required to be equipped. The conventional diode rectification system has low output voltage, large current harmonic wave and poor voltage stability, and the adoption of a Pulse Width Modulation (PWM) rectification technology is the development direction in the future.
On one hand, in order to stabilize the power fluctuation of the pulse load and improve the system stability and the power supply reliability, an energy storage system with a certain capacity is required to be equipped. Especially in the comprehensive power system of a ship, the impact of the use of a large number of high-energy pulse weapons on the power system is great, and the energy storage system plays an increasingly critical role. However, the conventional large-scale energy storage requires a large number of battery cells connected in series and parallel, which not only has low efficiency and poor reliability, but also requires an additional energy management system for SOC (State of charge) equalization control.
On the other hand, an energy storage system composed of a single type of energy storage element is difficult to meet the requirements for instantaneous high-power fluctuation and long-time continuous power supply, a composite energy storage system needs to be developed, and energy storage elements with different characteristics are reasonably used to meet different requirements of a power grid. In order to meet the requirements of the medium-voltage direct-current integrated power system of the ship, a PWM rectifying device and various energy storage devices are generally required to be equipped, but the total cost of a large number of medium-voltage direct-current converters is high, the size is large, and the occasions with high requirements on the volume power density of the medium-voltage direct-current integrated power system of the ship and the like are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the utility model aims to provide a rectification and compound energy storage integration direct current power generation system, this system have PWM rectification and compound energy storage function concurrently simultaneously, can stabilize the impulse load to the impact of electric wire netting and generating set, and control is nimble, and the integrated level is high, is applicable to occasions such as direct current microgrid, naval vessel middling pressure direct current comprehensive power system.
In order to achieve the above object, the utility model provides a rectification and compound energy storage integration direct current power generation system, include: an alternating current generator set; the composite energy storage type modular multilevel rectifier comprises m-phase circuits, wherein each phase circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm is formed by sequentially connecting the output ends of n energy storage sub-modules in series and then connecting bridge arm reactors in series, and the lower bridge arm is formed by sequentially connecting bridge arm reactors in series and the output ends of n energy storage sub-modules; the upper end of the upper bridge arm of each phase circuit is connected with the positive pole of a direct current power grid, the lower end of the lower bridge arm of each phase circuit is connected with the negative pole of the direct current power grid, the lower end of the upper bridge arm of each phase circuit is connected with the upper end of the lower bridge arm to form an alternating current output end of the phase, the alternating current output end of the m-phase circuit is connected with the output end of the alternating current generator set, and m and n are positive integers.
The rectification and composite energy storage integrated direct current power generation system has the functions of PWM rectification and hybrid energy storage, so that a set of converter can realize two functions of rectification power generation and energy storage simultaneously, and the cost is saved; because the super capacitor has high charging and discharging response speed and is suitable for providing high-frequency charging and discharging power, the battery has long continuous power supply time and is suitable for providing low-frequency charging and discharging power, the battery and the super capacitor are used for storing energy in a composite manner, the impact of a pulse load on a generator set can be reduced, and the service life of the battery can be prolonged; the three-winding high-frequency transformer is adopted, so that the insulation problem of the battery connected to a high-voltage power grid is solved, the complementary characteristic of the charge and discharge power of the super capacitor and the battery composite energy storage is fully utilized, and the number, the volume and the cost of the transformer are reduced; by adopting distributed energy storage, each energy storage element can independently control the charging and discharging current, the SOC balance among the energy storage elements can be realized through a control algorithm, and the large-scale series-parallel connection of the energy storage elements is avoided.
Further, the energy storage sub-module includes: the system comprises a first super capacitor, a first battery, a first three-winding high-frequency transformer, a first and a second primary side DC/AC converters, a secondary side AC/DC converter and an MMC submodule, wherein direct current input ends X1+, X1-X2 + and X2-of the first and the second primary side DC/AC converters are respectively connected with the first battery and the first super capacitor in parallel, alternating current output ends are respectively connected with two primary side windings of the first three-winding high-frequency transformer in parallel, an alternating current input end of the secondary side AC/DC converter is connected with a secondary side winding of the first three-winding high-frequency transformer in parallel, direct current output ends X3+ and X3-are connected with the direct current input end of the MMC submodule, and output ends X4+ and X4-of the MMC submodule form the output end of the energy storage submodule.
Optionally, the primary side DC/AC converter in the energy storage sub-module is in a two-level half-bridge configuration or a two-level full-bridge configuration.
Optionally, the secondary side AC/DC converter adopts a two-level half-bridge structure or a two-level full-bridge structure.
Optionally, the MMC sub-module in the energy storage sub-module employs a two-level half-bridge converter, or a two-level full-bridge converter, or a mixture of two-level half-bridge and full-bridge converters.
Further, the energy storage sub-module includes: the three-level MMC submodule comprises a second super capacitor, a second battery, a second three-winding high-frequency transformer, third and fourth primary side DC/AC converters, a secondary side three-level AC/DC converter and a three-level MMC submodule, wherein an alternating current input end of the secondary side AC/DC converter is connected with a secondary side winding of the second three-winding high-frequency transformer in parallel, three direct current output ends X3+, X3 and X3 are respectively connected with three direct current input ends of the three-level MMC submodule, and output ends X4+, X4-of the three-level MMC submodule form an output end of the energy storage submodule.
Furthermore, the three-level MMC sub-module structure in the energy storage sub-module is composed of a first switching device, a second switching device, a third switching device, a fourth switching device, a third switching device and a fourth switching device, wherein the collector of the first switching device is connected with the direct current output end X3+ of the secondary side three-level AC/DC converter, the emitter of the first switching device is connected with the collector of the second switching device and then is used as the positive output end X4+ of the three-level MMC submodule, the emitter of the second switching device is connected with the collector of the third switching device and then is connected with the direct current output end X3 of the secondary side three-level AC/DC converter, the emitter of the third switching device is connected with the collector of the fourth switching device and then is used as the negative output end X4-of the three-level MMC sub-module, the emitter of the fourth switching device is connected with the direct current output end X3-of the secondary side three-level AC/DC converter.
Optionally, the secondary side three-level AC/DC converter in the energy storage submodule has a flying capacitor type three-level half-bridge structure, or a diode clamping type three-level half-bridge structure, or an active clamping type three-level half-bridge structure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a rectification and composite energy storage integrated direct current power generation system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the internal components of an energy storage submodule according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an energy storage submodule of a primary DC/AC converter according to an embodiment of the present invention, which adopts a two-level half-bridge structure;
fig. 4 is a schematic structural diagram of an energy storage submodule of a primary DC/AC converter according to an embodiment of the present invention, which adopts a two-level full-bridge structure;
fig. 5 is a schematic structural diagram of an energy storage submodule of a secondary AC/DC converter adopting a two-level half-bridge structure according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an energy storage submodule of a secondary AC/DC converter adopting a two-level full-bridge structure according to an embodiment of the present invention;
fig. 7 is according to the utility model discloses one of MMC submodule structure among energy storage submodule piece: a schematic diagram of a half-bridge converter;
fig. 8 is according to the utility model discloses one of MMC submodule structure among energy storage submodule piece: the structural schematic diagram of the full-bridge converter;
fig. 9 is a schematic diagram of the internal components of an energy storage sub-module in which a three-level AC/DC converter and a three-level MMC sub-module are used as a secondary side according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a three-level MMC submodule according to an embodiment of the present invention;
fig. 11 is a diagram of one of the secondary side three-level AC/DC converter structures according to an embodiment of the present invention: schematic structural diagram of flying capacitor type three-level half-bridge;
fig. 12 is a diagram of one of the secondary side three-level AC/DC converter structures according to an embodiment of the present invention: a schematic diagram of a diode-clamped tri-level half bridge;
fig. 13 is a diagram of one of the secondary side three-level AC/DC converter structures according to an embodiment of the present invention: schematic diagram of an active clamping type tri-level half-bridge structure.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The rectification and composite energy storage integrated direct current power generation system provided according to the embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a rectification and composite energy storage integrated dc power generation system according to an embodiment of the present invention.
As shown in fig. 1, the rectification and composite energy storage integrated dc power generation system 10 includes: an ac generator set 100 and a composite energy storage type modular multilevel rectifier 200.
The composite energy storage type modular multilevel rectifier 200 comprises m-phase circuits, wherein each phase circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm is formed by sequentially connecting output ends of n energy storage sub-modules in series and then connecting the output ends of the n energy storage sub-modules in series with a bridge arm reactor, and the lower bridge arm is formed by sequentially connecting the bridge arm reactor and the output ends of the n energy storage sub-modules in series; the upper end of an upper bridge arm of each phase circuit is connected with the positive pole of a direct current power grid, the lower end of a lower bridge arm of each phase circuit is connected with the negative pole of the direct current power grid, the lower end of the upper bridge arm of each phase circuit is connected with the upper end of the lower bridge arm to form an alternating current output end of the phase, the alternating current output ends of m phase circuits are connected with the output end of an alternating current generator set, and m and n are positive integers. The utility model discloses system 10 has PWM rectification and compound energy storage function concurrently simultaneously, can stabilize pulse load and to the impact of electric wire netting and generating set, and control is nimble, and the integrated level is high, is applicable to occasions such as direct current microgrid, naval vessel middling pressure direct current comprehensive power system.
Further, in an embodiment of the present invention, as shown in fig. 2, the energy storage sub-module includes a super capacitor, a battery, a three-winding high frequency transformer, two primary DC/AC converters, a secondary AC/DC converter, and an MMC sub-module. The direct-current input ends X1+, X1-X2 + and X2-of the two primary side DC/AC converters are respectively connected with the battery and the super capacitor in parallel, and the alternating-current output ends are respectively connected with the two primary side windings of the three-winding high-frequency transformer in parallel. The alternating current input end of the secondary AC/DC converter is connected with the secondary winding of the three-winding high-frequency transformer in parallel, the direct current output ends X3+ and X3-are connected with the direct current input end of the MMC sub-module, and the output ends X4+ and X4-of the MMC sub-module form the output end of the energy storage sub-module.
Alternatively, in an embodiment of the present invention, the primary DC/AC converter in the energy storage submodule may adopt a two-level half-bridge structure shown in fig. 3, and may also adopt a two-level full-bridge structure shown in fig. 4. The secondary side AC/DC converter may adopt a two-level half-bridge structure as shown in fig. 5, or may adopt a two-level full-bridge structure as shown in fig. 6. The MMC submodule in the energy storage submodule employs a two-level half-bridge converter as shown in fig. 7 or a two-level full-bridge converter as shown in fig. 8 or a mixture of two-level half-bridge and full-bridge converters.
Further, in an embodiment of the present invention, in order to reduce the number of the energy storage sub-modules, the sub-side AC/DC converter may be replaced by a sub-side three-level AC/DC converter, and the MMC sub-module may be replaced by a three-level MMC sub-module, as shown in fig. 9. The alternating current input end of the secondary AC/DC converter is connected with the secondary winding of the three-winding high-frequency transformer in parallel, three direct current output ends X3+, X3 and X3-are respectively connected with three direct current input ends of the three-level MMC sub-module, and the output ends X4+, X4-of the three-level MMC sub-module form the output end of the energy storage sub-module.
Further, in an embodiment of the present invention, the three-level MMC submodule structure in the energy storage submodule is as shown in fig. 10, and is composed of four switching devices S1-S4, the collector of S1 is connected to the DC output terminal X3+ of the secondary-side three-level AC/DC converter, the emitter of S1 is connected to the collector of S2 and then serves as the positive output terminal X4+ of the three-level MMC submodule, the emitter of S2 is connected to the collector of S3 and then is connected to the DC output terminal X3 of the secondary-side three-level AC/DC converter, the emitter of S3 is connected to the collector of S4 and then serves as the negative output terminal X4-of the three-level MMC submodule, and the emitter of S4 is connected to the DC output terminal X3-of the secondary-side three-level AC/DC converter.
Optionally, in an embodiment of the present invention, the secondary side three-level AC/DC converter in the energy storage submodule may adopt a flying capacitor type three-level half-bridge structure shown in fig. 11, may also adopt a diode clamping type three-level half-bridge structure shown in fig. 12, and may also adopt an active clamping type three-level half-bridge structure shown in fig. 13.
In summary, the rectification and composite energy storage integrated direct current power generation system provided by the embodiment of the utility model has both the PWM rectification and hybrid energy storage functions, so that one set of converter can simultaneously realize the rectification power generation and energy storage functions, thereby saving the cost; because the super capacitor has high charging and discharging response speed and is suitable for providing high-frequency charging and discharging power, the battery has long continuous power supply time and is suitable for providing low-frequency charging and discharging power, the battery and the super capacitor are used for storing energy in a composite manner, the impact of a pulse load on a generator set can be reduced, and the service life of the battery can be prolonged; the three-winding high-frequency transformer is adopted, so that the insulation problem of the battery connected to a high-voltage power grid is solved, the complementary characteristic of the charge and discharge power of the super capacitor and the battery composite energy storage is fully utilized, and the number, the volume and the cost of the transformer are reduced; by adopting distributed energy storage, each energy storage element can independently control the charging and discharging current, the SOC balance among the energy storage elements can be realized through a control algorithm, and the large-scale series-parallel connection of the energy storage elements is avoided.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (8)
1. A rectification and composite energy storage integrated direct current power generation system is characterized by comprising:
an alternating current generator set;
the composite energy storage type modular multilevel rectifier comprises m-phase circuits, wherein each phase circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm is formed by sequentially connecting the output ends of n energy storage sub-modules in series and then connecting bridge arm reactors in series, and the lower bridge arm is formed by sequentially connecting bridge arm reactors in series and the output ends of n energy storage sub-modules; the upper end of the upper bridge arm of each phase circuit is connected with the positive pole of a direct current power grid, the lower end of the lower bridge arm of each phase circuit is connected with the negative pole of the direct current power grid, the lower end of the upper bridge arm of each phase circuit is connected with the upper end of the lower bridge arm to form an alternating current output end of the phase, the alternating current output end of the m-phase circuit is connected with the output end of the alternating current generator set, and m and n are positive integers.
2. The system of claim 1, wherein the energy storage sub-module comprises:
the system comprises a first super capacitor, a first battery, a first three-winding high-frequency transformer, a first and a second primary side DC/AC converters, a secondary side AC/DC converter and an MMC submodule, wherein direct current input ends X1+, X1-X2 + and X2-of the first and the second primary side DC/AC converters are respectively connected with the first battery and the first super capacitor in parallel, alternating current output ends are respectively connected with two primary side windings of the first three-winding high-frequency transformer in parallel, an alternating current input end of the secondary side AC/DC converter is connected with a secondary side winding of the first three-winding high-frequency transformer in parallel, direct current output ends X3+ and X3-are connected with the direct current input end of the MMC submodule, and output ends X4+ and X4-of the MMC submodule form the output end of the energy storage submodule.
3. The system of claim 2, wherein the primary side DC/AC converter in the energy storage sub-module is in a two-level half-bridge configuration or a two-level full-bridge configuration.
4. The system of claim 2, wherein the secondary side AC/DC converter employs a two-level half-bridge configuration or a two-level full-bridge configuration.
5. The system of claim 2, wherein the MMC sub-module of the energy storage sub-module employs a two-level half-bridge converter, or a two-level full-bridge converter, or a mixture of two-level half-bridge and full-bridge converters.
6. The system of claim 1, wherein the energy storage sub-module comprises:
the three-level MMC submodule comprises a second super capacitor, a second battery, a second three-winding high-frequency transformer, third and fourth primary side DC/AC converters, a secondary side three-level AC/DC converter and a three-level MMC submodule, wherein an alternating current input end of the secondary side AC/DC converter is connected with a secondary side winding of the second three-winding high-frequency transformer in parallel, three direct current output ends X3+, X3 and X3 are respectively connected with three direct current input ends of the three-level MMC submodule, and output ends X4+, X4-of the three-level MMC submodule form an output end of the energy storage submodule.
7. The system of claim 6, wherein the three-level MMC sub-module structure in the energy storage sub-module is composed of first to fourth switching devices, the collector of the first switching device is connected with the DC output X3+ of the secondary side three-level AC/DC converter, the emitter of the first switching device is connected with the collector of the second switching device and then is used as the positive output end X4+ of the three-level MMC submodule, the emitter of the second switching device is connected with the collector of the third switching device and then is connected with the direct current output end X3 of the secondary side three-level AC/DC converter, the emitter of the third switching device is connected with the collector of the fourth switching device and then is used as the negative output end X4-of the three-level MMC sub-module, the emitter of the fourth switching device is connected with the direct current output end X3-of the secondary side three-level AC/DC converter.
8. The system of claim 7, wherein the secondary side tri-level AC/DC converter in the energy storage sub-module has a flying capacitor tri-level half bridge configuration, or a diode clamped tri-level half bridge configuration, or an active clamped tri-level half bridge configuration.
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