CN213341661U - Distributed AC/DC hybrid micro-grid - Google Patents
Distributed AC/DC hybrid micro-grid Download PDFInfo
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- CN213341661U CN213341661U CN202022292160.1U CN202022292160U CN213341661U CN 213341661 U CN213341661 U CN 213341661U CN 202022292160 U CN202022292160 U CN 202022292160U CN 213341661 U CN213341661 U CN 213341661U
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Abstract
The utility model discloses a distributed AC/DC hybrid micro-grid, which comprises a distributed power generation unit, a DC bus, a user power supply unit and a commercial power supplement unit; the distributed power generation unit is connected with the direct current bus; the direct current bus and the commercial power supplementary unit are respectively connected with the user power supply unit; the distributed power generation unit comprises distributed alternating current power generation equipment, a three-phase rectifier filter, a one-way boosting pulse square wave inverter and an amorphous alloy boosting pulse transformer which are sequentially connected in series; the user power supply unit comprises a one-way step-down pulse square wave inverter, an amorphous alloy step-down transformer and a power frequency sine wave inverter; the commercial power supplementary unit comprises a commercial power rectifier and an energy storage unit. Has the advantages that: this device adopts high frequency metallic glass pulse transformer to realize that the square wave steps up and down, directly reduced inverter's the technical degree of difficulty and promoted the reliability, uses high frequency metallic glass transformer to realize the square wave contravariant, therefore equipment volume diminishes, cost reduction, keeps higher transmission efficiency simultaneously.
Description
The technical field is as follows:
the utility model relates to an electric power transmission system especially relates to a little electric wire netting is mixed to distributing type alternating current-direct current.
Background art:
in a new energy distributed power generation system, a mode of firstly inverting and then connecting to the grid is generally adopted, and the transmission needs to be boosted again. The system has the advantages that the conventional technology and equipment are adopted, additional technical research and development are not needed, but the popularization and the application are directly influenced due to the high equipment cost and the high reliability requirement of the grid-connected equipment and the phenomena of equipment damage, electricity abandonment and the like easily occur in the application.
The utility model has the following contents:
an object of the utility model is to provide a low-cost, highly reliable and easily incorporate new power generation facility's distributed AC/DC hybrid microgrid.
The utility model discloses by following technical scheme implement: the distributed alternating current-direct current hybrid micro-grid comprises more than one distributed power generation unit, a direct current bus, a user power supply unit and a mains supply supplement unit; more than one distributed power generation unit is connected with the direct current bus; the direct current bus and the commercial power supplementary unit are respectively connected with the user power supply unit; each distributed power generation unit comprises distributed alternating current power generation equipment, a three-phase rectifier filter, a one-way boosting pulse square wave inverter and an amorphous alloy boosting pulse transformer which are sequentially connected in series; the output end of the amorphous alloy boosting pulse transformer is connected with the direct current bus; the user power supply unit comprises two unidirectional step-down pulse square wave inverters, two amorphous alloy step-down transformers and a power frequency sine wave inverter; the input ends of the two unidirectional voltage reduction pulse square wave inverters are respectively connected with the direct current bus; the output ends of the two unidirectional step-down pulse square wave inverters are respectively connected with the input end of one amorphous alloy step-down transformer; the output ends of the two amorphous alloy step-down transformers are connected with the input end of the power frequency sine wave inverter; the commercial power supplementary unit comprises a commercial power rectifier and an energy storage unit; and the output end of the commercial power rectifier is connected with the input end of the power frequency sine wave inverter.
Preferably, an overrun protection load is connected to the output end of the unidirectional boost pulse square wave inverter.
Preferably, the commercial power supplementary unit further comprises a backup battery, and an output end of the backup battery is connected with an input end of the power frequency sine wave inverter.
Preferably, the unidirectional boost pulse square wave inverter and the unidirectional buck pulse square wave inverter are both provided with an IGBT module therein.
The utility model has the advantages that: compared with the prior art, the device adopts the high-frequency amorphous alloy pulse transformer to realize the square wave voltage boosting and reducing, directly reduces the technical difficulty of the inverter and improves the reliability, and the high-frequency amorphous alloy transformer is used for realizing the square wave inversion, so that the equipment volume is reduced, the cost is reduced, and meanwhile, higher transmission efficiency is kept. Meanwhile, a direct-current grid-connected mode is adopted, so that new power generation equipment is simple to incorporate into the microgrid. The maximum power regulation function is adopted in the square wave inverter device, and the utilization efficiency of new energy is directly improved.
Description of the drawings:
fig. 1 is a schematic diagram of the system connection of the present invention.
The system comprises a distributed power generation unit 1, distributed alternating-current power generation equipment 11, a three-phase rectifier filter 12, a unidirectional boost pulse square wave inverter 13, an amorphous alloy boost pulse transformer 14, a direct-current bus 2, a user power supply unit 3, a unidirectional buck pulse square wave inverter 31, an amorphous alloy buck transformer 32, a power frequency sine wave inverter 33, a commercial power supplement unit 4, a commercial power rectifier 41 and a backup battery 42.
The specific implementation mode is as follows:
example 1: as shown in fig. 1, the distributed ac/dc hybrid microgrid includes more than one distributed power generation unit 1, a dc bus 2, a user power supply unit 3, and a utility power supplement unit 4; each distributed power generation unit 1 comprises distributed alternating current power generation equipment 11, a three-phase rectifier filter 12, a one-way boost pulse square wave inverter 13 and an amorphous alloy boost pulse transformer 14 which are sequentially connected in series; the distributed ac power generation equipment 11 is any one of distributed power generation devices such as a wind power generator or a tidal power generator; the distributed AC power generation equipment 11 generates three-phase AC power, and the output voltage range is 100-800V. The output of each generator rectifies and filters alternating current generated by the distributed alternating current power generation equipment 11 into direct current of 200-800V through a three-phase rectifier filter 12; the unidirectional boost pulse square wave inverter 13 with an IGBT module arranged inside converts direct current into square waves with the frequency of 20KHz and the frequency of 50KVA, and has the function of maximum power regulation, and the output power is regulated by regulating the pulse width; the amorphous alloy boosting pulse transformer 14 boosts the input direct current, the transformer adopts an amorphous alloy magnetic core, can work at higher frequency and has high efficiency, rectification is carried out after boosting, the output end of the amorphous alloy boosting pulse transformer 14 is connected with the direct current bus 2 to carry out high-voltage transmission, the transmission efficiency is ensured, and the transmission voltage of the direct current bus 2 is +/-1500V; the user power supply unit 3 comprises two one-way step-down pulse square wave inverters 31 with IGBT modules arranged inside, two amorphous alloy step-down transformers 32 and a power frequency sine wave inverter 33; the output ends of the two unidirectional step-down pulse square wave inverters 31 are respectively connected with the input end of an amorphous alloy step-down transformer 32; the output ends of the two amorphous alloy step-down transformers 32 are both connected with the input end of the power frequency sine wave inverter 33; the input ends of the two unidirectional voltage reduction pulse square wave inverters 31 are respectively connected with the direct current bus 2; the +/-1500V voltage on the direct current bus 2 is converted into square waves through two symmetrical unidirectional voltage reduction pulse square wave inverters 31, the square waves are respectively reduced in voltage through amorphous alloy step-down transformers 32, the voltage is reduced to 600V and then rectified, and two rectified direct currents are connected in parallel and output to a power frequency sine wave inverter 33; the power frequency sine wave inverter 33 converts the input direct current into alternating current for users to use; the mains supply supplementary unit 4 comprises a mains supply rectifier 41 and a backup battery 42; the output end of the commercial power rectifier 41 and the output end of the backup battery 42 are respectively connected with the input end of the power frequency sine wave inverter 33; when the electric energy generated by the distributed ac power generation equipment 11 cannot meet the load demand, the electric energy can be supplemented by commercial power, and the commercial power is rectified by the commercial power rectifier 41 to obtain 510V direct current which is converged to the power frequency sine wave inverter 33; and in order to satisfy a load of a large current for a short time, the system is provided with a backup battery 42. The voltage stability at this point is ensured by three sources of the distributed alternating current power generation equipment 11, the commercial power and the backup battery 42, and the voltage can be continuously supplied to the user side load.
Claims (4)
1. The distributed alternating current-direct current hybrid micro-grid is characterized by comprising more than one distributed power generation unit, a direct current bus, a user power supply unit and a mains supply supplement unit; more than one distributed power generation unit is connected with the direct current bus; the direct current bus and the commercial power supplementary unit are respectively connected with the user power supply unit; each distributed power generation unit comprises distributed alternating current power generation equipment, a three-phase rectifier filter, a one-way boosting pulse square wave inverter and an amorphous alloy boosting pulse transformer which are sequentially connected in series; the output end of the amorphous alloy boosting pulse transformer is connected with the direct current bus; the user power supply unit comprises two unidirectional step-down pulse square wave inverters, two amorphous alloy step-down transformers and a power frequency sine wave inverter; the input ends of the two unidirectional voltage reduction pulse square wave inverters are respectively connected with the direct current bus; the output ends of the two unidirectional step-down pulse square wave inverters are respectively connected with the input end of one amorphous alloy step-down transformer; the output ends of the two amorphous alloy step-down transformers are connected with the input end of the power frequency sine wave inverter; the commercial power supplementary unit comprises a commercial power rectifier and an energy storage unit; and the output end of the commercial power rectifier is connected with the input end of the power frequency sine wave inverter.
2. The distributed alternating current-direct current hybrid microgrid of claim 1, wherein an overrun protection load is connected to an output end of the unidirectional boost pulse square wave inverter.
3. The distributed ac-dc hybrid microgrid of claim 1, wherein the utility power supply supplementing unit further comprises a backup battery, and an output end of the backup battery is connected with an input end of the power frequency sine wave inverter.
4. The distributed ac-dc hybrid microgrid of claim 1, wherein IGBT modules are disposed in both said unidirectional boost pulse square wave inverter and said unidirectional buck pulse square wave inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022292160.1U CN213341661U (en) | 2020-10-14 | 2020-10-14 | Distributed AC/DC hybrid micro-grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022292160.1U CN213341661U (en) | 2020-10-14 | 2020-10-14 | Distributed AC/DC hybrid micro-grid |
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| CN213341661U true CN213341661U (en) | 2021-06-01 |
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| CN202022292160.1U Active CN213341661U (en) | 2020-10-14 | 2020-10-14 | Distributed AC/DC hybrid micro-grid |
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