Alternating current and direct current interconnected intermediate frequency power supply system

Abstract

The utility model relates to the technical field of intermediate frequency power supplies, and discloses an alternating current and direct current interconnected intermediate frequency power supply system, which comprises a plurality of alternating current and direct current power supply units which are mutually redundant, a direct current bus unit and a plurality of inversion intermediate frequency units which are mutually redundant, and the direct current bus unit comprises a first direct current bus and a second direct current bus which are mutually redundant. The input end of the AC-DC power supply unit is connected with the medium-voltage power supply, and the output end is connected with the DC bus unit. The input end of the inversion intermediate frequency unit is connected with the DC bus unit, and the output end is connected with a process load. The AC / DC interconnected intermediate-frequency power supply system is provided with interfaces capable of effectively accessing an AC power supply and a DC power supply, so that effective access of various power supplies can be realized, and the capacity and capability of the power supply system are ensured; the system has the characteristic of multi-stage interconnection and intercommunication, meets the requirement of high-reliability operation of a process system, and has relatively high system reliability; and a parallel operation control mode is adopted, so that the system economy is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of intermediate frequency power supply, specifically to an AC-DC interconnected intermediate frequency power supply system. BACKGROUND

[0002] In order to guarantee the safety of energy supply and realize the sustainable development and utilization of energy, China's nuclear power industry has been vigorously supported and developed rapidly, and the demand for nuclear fuel is increasing. The construction of uranium isotope separation engineering will continue to expand.

[0003] The main process production line of the active uranium isotope separation engineering has a special power supply system, which is manifested as follows: a plurality of main process transformers are arranged in the main process workshop substation, and a plurality of variable frequency power supplies are loaded on the low voltage side of each main process transformer feeder cabinet; the plurality of main process transformers are connected through the contact cabinet at the low voltage side, and are mutually (public) standby, and the capacity of one main process transformer can load all the loads of the fault (maintenance) transformer.

[0004] On the load side, a plurality of variable frequency power supplies are combined into an intermediate frequency power supply unit to supply power to the process main machine; the operation model has a "4 standby 2", "4 standby 1" redundancy mode and a "plurality of variable frequency power supplies in parallel operation" mode. However, no matter in which mode, the power supply side of the variable frequency power supply in the intermediate frequency power supply unit comes from a plurality of main process transformers of different bus sections, and the AC power from the main process transformer is directly supplied to the load after frequency conversion by the variable frequency power supply. This power supply mode requires multiple devices, multiple backups and high complex operation to realize stable and reliable operation of the power supply system, the internal redundancy structure of the power supply system is complex, the equipment cost is high, the production and maintenance cost is high and the maintenance difficulty is great.

[0005] Therefore, how to effectively improve and optimize the power supply system structure of the uranium isotope separation engineering and improve the reliability and economy of the power supply system has become an urgent problem to be solved in the low-carbon development of the uranium isotope separation engineering. UTILITY MODEL CONTENTS

[0006] In order to overcome the problems in the related art, the utility model provides an AC-DC interconnected intermediate frequency power supply system, which has the characteristics of multi-level interconnection and intercommunication, and gradually improves the current situation that the existing main process power supply system improves the stable and reliable operation of the system through device backup and complex operation; the control mode of parallel operation of power supplies is adopted to improve the redundancy and reliability of the system, and meet the requirements of high reliable operation of the process system.

[0007] The utility model adopts the technical scheme: an AC-DC interconnected intermediate frequency power supply system, comprising a plurality of AC-DC power supply units which are redundant to each other, a DC bus unit, and a plurality of inverter intermediate frequency units which are redundant to each other.

[0008] The direct current bus unit comprises a first direct current bus and a second direct current bus which are redundant to each other;

[0009] The AC / DC power supply unit comprises a plurality of process transformers, a low-voltage AC bus, and a plurality of rectifiers, an input end of the process transformer is connected with a medium-voltage power supply, an output end of the process transformer is connected with the low-voltage AC bus, an input end of the rectifier is connected with the low-voltage AC bus, and an output end of the rectifier is connected with the first direct current bus and the second direct current bus respectively;

[0010] An input end of the inverter intermediate frequency unit is connected with the direct current bus unit, and an output end of the inverter intermediate frequency unit is connected with a process load.

[0011] Further, a low-voltage tie switch is arranged between the low-voltage AC buses of the AC / DC power supply unit.

[0012] Further, the rectifier is connected with the low-voltage AC bus through a rectifier input connection line which is connected with a rectifier input switch in series.

[0013] Further, the AC / DC power supply unit is two, and the AC / DC power supply unit comprises one process transformer and two rectifiers.

[0014] Further, an intermediate frequency AC bus unit is further included, the inverter intermediate frequency unit comprises an inverter intermediate frequency power supply and a load unit, an input end of the inverter intermediate frequency power supply is connected with the first direct current bus and the second direct current bus respectively, an output end of the inverter intermediate frequency power supply is connected to an input end of the intermediate frequency AC bus unit and the load unit respectively, the input end of the load unit is further connected with the intermediate frequency AC bus unit, and an output end of the load unit is connected with the process load.

[0015] Further, the intermediate frequency AC bus unit comprises a first intermediate frequency AC bus and a second intermediate frequency AC bus which are redundant to each other;

[0016] An input end of the inverter intermediate frequency power supply is connected with the first direct current bus through a first AC / DC connection line which is connected with a first input switch in series, and an input end of the inverter intermediate frequency power supply is connected with the second direct current bus through a second AC / DC connection line which is connected with a second input switch in series.

[0017] An output end of the inverter intermediate frequency power supply is connected with the first intermediate frequency AC bus through a first AC connection line which is connected with a first output switch in series, an output end of the inverter intermediate frequency power supply is connected with the second intermediate frequency AC bus through a second AC connection line which is connected with a second output switch in series, and the output end of the inverter intermediate frequency power supply is connected to the load unit through a third AC connection line.

[0018] Further, the load unit comprises a load cabinet, the load cabinet is provided with a single-head double-throw switch and an electronic switch, an input end of the electronic switch is connected with the intermediate-frequency alternating-current bus unit, input ends of the single-head double-throw switch are connected with output ends of the electronic switch and the inverter intermediate-frequency power supply respectively, and an output end of the single-head double-throw switch is connected with the process load through a load power supply cable.

[0019] Further, the direct-current bus unit is provided with a plurality of photovoltaic power generation system PCS interfaces, and is connected with the photovoltaic power generation system through a power supply connecting line.

[0020] Further, the medium-voltage power supply is alternating-current commercial power, the voltage is 10kV or 35kV, and the two alternating-current direct-current power supply units are connected with alternating-current commercial power of different bus sections.

[0021] The AC / DC interconnected intermediate-frequency power supply system has the following technical effects: (1) a plurality of AC / DC power supply units, a direct-current bus unit and a plurality of inverter intermediate-frequency units are configured in redundancy. The AC / DC power supply unit comprises a plurality of process transformers, a low-voltage alternating-current bus and a plurality of rectifiers. Low-voltage interconnection switches are arranged between the low-voltage alternating-current buses of the AC / DC power supply unit to realize the interconnection and intercommunication between the low-voltage alternating-current buses. The direct-current bus unit comprises a first direct-current bus and a second direct-current bus in redundancy. The rectifiers have double direct-current output interfaces. The rectifiers of the plurality of AC / DC power supply units are connected with the first direct-current bus and the second direct-current bus respectively to realize the interconnection and intercommunication between the direct-current buses. The plurality of AC / DC power supply units are connected with the first direct-current bus and the second direct-current bus respectively. In this way, the AC / DC interconnected intermediate-frequency power supply system realizes the interconnection and intercommunication among multiple levels, has double redundant standby system channels, gradually improves the current situation that the existing main process power supply system improves the stable and reliable operation of the system through equipment standby and complex operation, meets the requirement of high reliable operation of the process system, and has high system reliability.

[0022] (2) The control mode of parallel operation is adopted between each power supply, so that the deployment optimization management of the power supply system is more operable. The use frequency of each unit in the power supply system can be dynamically adjusted according to the operation and maintenance requirement, the utilization rate of each unit of the power supply system is improved, the whole power supply system is always in the best operation state, and the system economy is higher.

[0023] (3) The process transformer input end is connected with alternating-current commercial power, has an alternating-current power supply interface, the direct-current bus is provided with a PCS photovoltaic system interface, and is a direct-current power supply interface. The photovoltaic power generation system can be connected through a power supply connecting line. In this way, the AC / DC interconnected intermediate-frequency power supply system has interfaces for effectively connecting alternating-current power supply and direct-current power supply, can realize the effective connection of various power supplies, and ensures the capacity and ability of the power supply system.

[0024] The other features and advantages of the utility model will be explained in detail in the subsequent specific implementation mode part. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used to explain the present disclosure together with the specific implementation mode below, but do not constitute the limitation to the present disclosure.In the drawings:

[0026] Figure 1 It is the whole structure schematic diagram of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.

[0027] Figure 2 It is the structure schematic diagram of the AC-DC power supply unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.

[0028] Figure 3 It is the structure schematic diagram of the inverter medium frequency unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.

[0029] Fig. 10 is the structure schematic diagram of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 20 is the structure schematic diagram of the AC-DC power supply unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 30 is the structure schematic diagram of the inverter medium frequency unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 40 is the structure schematic diagram of the AC-DC power supply unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 50 is the structure schematic diagram of the inverter medium frequency unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 60 is the structure schematic diagram of the AC-DC power supply unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment.Fig. 70 is the structure schematic diagram of the inverter medium frequency unit of an AC-DC interconnected medium frequency power supply system according to an exemplary embodiment. DETAILED DESCRIPTION

[0030] The specific implementation mode of the utility model disclosed in the following will be explained in detail in conjunction with the drawings.It should be understood that the specific implementation mode described here is only used to explain and interpret the present disclosure, and is not used to limit the present disclosure.

[0031] AsFigures 1 to 3 The utility model discloses an AC-DC interconnected intermediate frequency power supply system 10, including a plurality of redundancy AC-DC power supply units 20, DC bus unit 30 and a plurality of redundancy inverter intermediate frequency units 40;DC bus unit 30 includes redundancy first DC bus 31 and second DC bus 32;AC-DC power supply unit 20 includes a plurality of process transformers 21, low voltage AC bus 22 and a plurality of rectifiers 23, and the input end of process transformer 21 is connected with medium voltage power supply, and the output end of process transformer 21 is connected with low voltage AC bus 22, and the input end of rectifier 23 is connected with low voltage AC bus 22, and the output end of rectifier 23 is connected with first DC bus 31 and second DC bus 32 respectively;The input end of inverter intermediate frequency unit 40 is connected with DC bus unit 30, and the output end of inverter intermediate frequency unit 40 is connected with process load 70.

[0032] The utility model discloses an AC-DC interconnected intermediate frequency power supply system 10, including a plurality of redundancy AC-DC power supply units 20, DC bus unit 30 and a plurality of redundancy inverter intermediate frequency units 40;DC bus unit 30 includes redundancy first DC bus 31 and second DC bus 32;AC-DC power supply unit 20 includes a plurality of process transformers 21, low voltage AC bus 22 and a plurality of rectifiers 23, and the input end of process transformer 21 is connected with medium voltage power supply, and the output end of process transformer 21 is connected with low voltage AC bus 22, and the input end of rectifier 23 is connected with low voltage AC bus 22, and the output end of rectifier 23 is connected with first DC bus 31 and second DC bus 32 respectively;The input end of inverter intermediate frequency unit 40 is connected with DC bus unit 30, and the output end of inverter intermediate frequency unit 40 is connected with process load 70.

[0033] Exemplarily, as Figure 1 , Figure 2As shown in the drawings, the low-voltage interconnection switch 25 is arranged between the low-voltage AC bus 22 of the AC-DC power supply unit 20. By arranging the low-voltage interconnection switch 25, the interconnection and intercommunication of the low-voltage AC bus 22 at this level between the several AC-DC power supply units 20 in the AC-DC interconnected intermediate frequency power supply system 10 are realized. Further, the rectifier 23 is connected to the low-voltage AC bus 22 through the rectifier input connection line 231 with the rectifier input switch 232 connected in series. By arranging the rectifier input switch 232, the AC-DC interconnected intermediate frequency power supply system 10 can realize effective scheduling of the rectifier 23, and optimize the deployment management. The output end of the rectifier 23 of the several AC-DC power supply units 20 is connected to the first DC bus 31 and the second DC bus 32 through the rectifier output connection line 233, respectively, so as to realize the interconnection and intercommunication and redundancy of the first DC bus 31 and the second DC bus 32 at this level.

[0034] Specifically, as shown in the drawings, Figure 1 , Figure 2 In the example embodiment of the present disclosure, the AC-DC interconnected intermediate frequency power supply system 10 of the utility model has two AC-DC power supply units 20, each of which includes one process transformer 21 and two rectifiers 23. In the AC-DC interconnected intermediate frequency power supply system 10, the two AC-DC power supply units 20 are main and standby to each other and can be operated side by side. The input end of the process transformer 21 of the AC-DC power supply unit 20 is connected to the medium-voltage power supply, which is the AC commercial power 24 with a voltage of 10kV or 35kV, and the two AC-DC power supply units 20 are connected to the AC commercial power 24 of different bus sections. Connecting the process transformers 21 of the two AC-DC power supply units 20 to the AC commercial power 24 of different bus sections realizes the redundancy of external power supply access. In each AC-DC power supply unit 20, the two rectifiers 23 are main and standby to each other and are connected to the low-voltage AC bus 22 through the rectifier input connection line 231 with the rectifier input switch 232 connected in series, and the access of the rectifier 23 can be adjusted and controlled through the rectifier input switch 232.

[0035] For example, as shown in the drawings, Figure 1 , Figure 3 In the example embodiment of the present disclosure, the AC-DC interconnected intermediate frequency power supply system 10 of the utility model further includes an intermediate frequency AC bus unit 50, the inverter intermediate frequency unit 40 includes an inverter intermediate frequency power supply 41 and a load unit 42, the input end of the inverter intermediate frequency power supply 41 is connected to the first DC bus 31 and the second DC bus 32, respectively, the output end of the inverter intermediate frequency power supply 41 is connected to the input end of the intermediate frequency AC bus unit 50 and the load unit 42, respectively, the input end of the load unit 42 is also connected to the intermediate frequency AC bus unit 50, and the output end of the load unit 42 is connected to the process load 70.

[0036] In the exemplary embodiments of the present disclosure, the input ends of the inverter intermediate frequency power supply 41 are connected to the first DC bus 31 and the second DC bus 32 respectively, realizing the redundant backup of the input ends of the inverter intermediate frequency power supply 41. The low-voltage DC current of the DC bus unit 30 is converted into low-voltage intermediate frequency AC current by the inverter intermediate frequency power supply 41.

[0037] Specifically, the intermediate frequency AC bus unit 50 includes a first intermediate frequency AC bus 51 and a second intermediate frequency AC bus 52 which are redundant to each other; the input ends of the inverter intermediate frequency power supply 41 are connected to the first DC bus 31 through the first AC-DC connection line 411 which is connected in series with the first input switch 412, and are connected to the second DC bus 32 through the second AC-DC connection line 413 which is connected in series with the second input switch 414; the output ends of the inverter intermediate frequency power supply 41 are connected to the first intermediate frequency AC bus 51 through the first AC connection line 415 which is connected in series with the first output switch 416, are connected to the second intermediate frequency AC bus 52 through the second AC connection line 417 which is connected in series with the second output switch 418, and are connected to the load unit 42 through the third AC connection line 419.

[0038] In the exemplary embodiments of the present disclosure, the output ends of the inverter intermediate frequency power supply 41 of several inverter intermediate frequency units 40 inside the AC-DC interconnected intermediate frequency power supply system 10 are connected to the first intermediate frequency AC bus 51 and the second intermediate frequency AC bus 52 respectively, realizing the redundant interconnection of the first intermediate frequency AC bus 51 and the second intermediate frequency AC bus 52. After the inverter intermediate frequency power supply 41 takes power from the DC bus unit 30, the current is converted into low-voltage intermediate frequency AC current and then input to the first intermediate frequency AC bus 51 and the second intermediate frequency AC bus 52. The first input switch 412 and the second input switch 414 are arranged between the input ends of the inverter intermediate frequency power supply 41 and the DC bus unit 30, realizing efficient switching of different transmission lines between the inverter intermediate frequency power supply 41 and the DC bus unit 30, so that the inverter intermediate frequency power supply 41 can quickly select to access different upper connection power sources. The first output switch 416 and the second output switch 418 are arranged between the output ends of the inverter intermediate frequency power supply 41 and the intermediate frequency AC bus unit 50, so that the inverter intermediate frequency power supply 41 can select different transmission lines or all lines to supply power to the intermediate frequency AC bus unit 50.

[0039] Specifically, the load unit 42 includes a load cabinet, the load cabinet is provided with a single-head double-throw switch 421 and an electronic switch 422, the input end of the electronic switch 422 is connected to the intermediate frequency AC bus unit 50, the input end of the single-head double-throw switch 421 is connected to the output end of the electronic switch 422 and the output end of the inverter intermediate frequency power supply 41 respectively, and the output end of the single-head double-throw switch 421 is connected to the process load 70 through the load power supply cable 71.

[0040] In an exemplary embodiment of this disclosure, the electronic switch 422 includes a first electronic switch 4221 and a second electronic switch 4222. The input terminal of the first electronic switch 4221 is connected to the first intermediate frequency AC bus 51 via a first load unit input connection line 423, and the input terminal of the second electronic switch 4222 is connected to the second intermediate frequency AC bus 52 via a second load unit input connection line 424. The input terminal of the single-ended double-throw switch 421 includes a first input terminal and a second input terminal. The first input terminal is connected to the output terminals of the first electronic switch 4221 and the second electronic switch 4222, respectively. The second input terminal is connected to the output terminal of the inverter intermediate frequency power supply 41 via a third AC connection line 419. The output terminal of the single-ended double-throw switch 421 is connected to the process load 70 via a load power supply cable 71. The load unit 42 draws low-voltage intermediate frequency AC power from the first intermediate frequency AC bus 51, the second intermediate frequency AC bus 52 and the output terminal of the inverter intermediate frequency power supply 41 and supplies it to the process load 70. By changing the single-head double-throw switch 421, the process load 70 can be powered by the inverter intermediate frequency power supply 41 or the intermediate frequency AC bus unit 50, thereby realizing multi-channel power supply.

[0041] For example, such as Figure 1 As shown in the exemplary embodiment of this disclosure, the DC bus unit 30 is provided with a plurality of photovoltaic power generation system PCS interfaces 33, which are connected to the photovoltaic power generation system 60 through power connection lines 34. The photovoltaic power generation system 60 is connected to the AC / DC interconnected intermediate frequency power supply system 10 to realize the utilization of multiple energy sources, ensure the safe, economical, stable, and reliable power supply of the AC / DC interconnected intermediate frequency power supply system 10, and meet the low-carbon construction and operation development needs of uranium isotope separation projects.

[0042] In summary, the AC / DC interconnected intermediate frequency power supply system 10 of this utility model adopts bus power supply in its front-end, middle-end, and back-end, which can effectively reduce transmission loss and improve transmission efficiency. The AC / DC interconnected intermediate frequency power supply system 10 includes several redundant AC / DC power supply units 20, DC bus units 30, and several redundant inverter intermediate frequency units 40. Within the power supply system, it achieves a multi-level interconnected power supply structure with redundant electrical components and buses at the same level. This power supply structure has dual-redundant backup system channels, meeting the high reliability requirements of the process system. Multiple control switches are set at the same level or between different levels to meet the efficient switching between units of the power supply system, ensuring the continuity and stability of the power supply system. The multi-channel interconnection between power supply systems and the corresponding control switches make the allocation and optimization management of the power supply system more operable. The usage frequency of each unit within the power supply system can be dynamically adjusted according to the operation and maintenance needs of the process load 70, improving the utilization rate of each unit and ensuring that the entire power supply system is always in optimal operating condition, further improving the economic efficiency of the power supply system.

[0043] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and all these simple modifications shall fall within the protection scope of the present disclosure.

[0044] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present disclosure.

[0045] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as it does not deviate from the idea of the present disclosure, and it should be considered as disclosed by the present disclosure.

Claims

1. An AC / DC interconnected intermediate frequency power supply system, characterized in that, The application relates to a power supply system for process load, comprising: a plurality of AC / DC power supply units in redundancy, a DC bus unit, and a plurality of inverter intermediate frequency units in redundancy; the DC bus unit comprises a first DC bus and a second DC bus in redundancy; the AC / DC power supply unit comprises a plurality of process transformers, a low-voltage AC bus, and a plurality of rectifiers, the input end of the process transformer is connected with a medium-voltage power supply, the output end of the process transformer is connected with the low-voltage AC bus, the input end of the rectifier is connected with the low-voltage AC bus, and the output end of the rectifier is connected with the first DC bus and the second DC bus respectively; the input end of the inverter intermediate frequency unit is connected with the DC bus unit, and the output end of the inverter intermediate frequency unit is connected with a process load.

2. The AC / DC hybrid medium frequency power supply system of claim 1, wherein, A low-voltage tie switch is arranged between the low-voltage AC buses of the AC / DC power supply units.

3. The AC / DC hybrid medium frequency power supply system of claim 1, wherein, The rectifier is connected with the low-voltage AC bus through a rectifier input connection line with a rectifier input switch connected in series.

4. The AC / DC hybrid medium frequency power supply system of claim 1, wherein, The AC / DC power supply unit is two, and the AC / DC power supply unit comprises one process transformer and two rectifiers.

5. The AC / DC hybrid medium frequency power supply system of claim 1, wherein, The application further comprises an intermediate frequency AC bus unit, the inverter intermediate frequency unit comprises an inverter intermediate frequency power supply and a load unit, the input end of the inverter intermediate frequency power supply is connected with the first DC bus and the second DC bus respectively, the output end of the inverter intermediate frequency power supply is connected with the input end of the intermediate frequency AC bus unit and the load unit respectively, the input end of the load unit is further connected with the intermediate frequency AC bus unit, and the output end of the load unit is connected with the process load.

6. The AC / DC hybrid medium frequency power supply system of claim 5, wherein, The intermediate frequency AC bus unit comprises a first intermediate frequency AC bus and a second intermediate frequency AC bus in redundancy; the input end of the inverter intermediate frequency power supply is connected with the first DC bus through a first AC / DC connection line with a first input switch connected in series, and the input end of the inverter intermediate frequency power supply is connected with the second DC bus through a second AC / DC connection line with a second input switch connected in series; the output end of the inverter intermediate frequency power supply is connected with the first intermediate frequency AC bus through a first AC connection line with a first output switch connected in series, the output end of the inverter intermediate frequency power supply is connected with the second intermediate frequency AC bus through a second AC connection line with a second output switch connected in series, and the output end of the inverter intermediate frequency power supply is connected with the load unit through a third AC connection line.

7. The AC / DC hybrid medium frequency power supply system of claim 5, wherein, The load unit comprises a load cabinet, the load cabinet is provided with a single-head double-throw switch and an electronic switch, the input end of the electronic switch is connected with the intermediate frequency AC bus unit, the input end of the single-head double-throw switch is connected with the output end of the electronic switch and the output end of the inverter intermediate frequency power supply respectively, and the output end of the single-head double-throw switch is connected with the process load through a load power supply cable.

8. The AC / DC hybrid medium frequency power supply system of claim 1, wherein, The DC bus unit is provided with a plurality of photovoltaic power generation system PCS interfaces and is connected with a photovoltaic power generation system through a power supply connection line.

9. The AC / DC hybrid medium frequency power supply system of claim 4, wherein, The medium-voltage power supply is an AC commercial power supply, the voltage is 10kV or 35kV, and two AC / DC power supply units are connected with AC commercial power supplies of different bus sections respectively.

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