Multi-source fusion flexible power transformation device of electrified railway substation

Abstract

The invention provides a multi-source fusion flexible power transformation device for an electrified railway substation, and relates to the technical field of electrified railway power supply. Firstly, power is supplied to each transformer circuit and an electric energy router circuit connected with the transformer circuit respectively through a three-phase high-voltage wire inlet circuit and a high-voltage bus circuit; the first electric energy router circuit and the second electric energy router circuit are connected into a medium-voltage common bus to supply power to a train traction load contact network, a high-voltage bus circuit is further connected with a medium-voltage bus circuit through a transformer power supply circuit, and the transformer power supply circuit is matched with the electric energy routers and is compatible with an out-phase power supply mode and an in-phase power supply mode. Flexible power transformation of an electrified railway substation is realized; the wind-solar power generation device is connected to the integrated flexible multi-port electric energy router integrating traction power supply and power distribution, the control method is expanded, access of distributed renewable energy sources is supported, cooperative control of clean energy and train traction load and power load is achieved, and the new energy access requirement is effectively met.

Description

Technical Field

[0001] The present invention relates to the technical field of electrified railway power supply, and particularly relates to a multi-source fusion flexible power conversion device for an electrified railway substation. Background Art

[0002] The railway power supply system consists of two core modules: the traction power supply system and the power distribution system. The traction power supply system uses single-phase AC 25 kV as the standardized system, and relies on traction substations to complete the conversion and transmission of high-voltage electrical energy. However, its power supply mode of phase separation or zoning based on phase sequence rotation inevitably generates electric phase separation areas within the system. This structural defect not only leads to frequent power supply island phenomena, affecting the train operation efficiency, but also severely restricts the energy interaction ability between different power supply intervals, ultimately resulting in a double decline in the system energy efficiency level and equipment utilization rate. In addition, the traditional system adopts a passive power supply architecture and lacks dynamic energy scheduling capabilities. When dealing with new power demands such as renewable energy grid connection and sudden emergency power supply, the system regulation margin and operation flexibility are significantly insufficient, and it is difficult to be compatible with the development trends of modern railway greening and intelligentization.

[0003] To solve the above problems, there are currently two main power supply methods for the power distribution loads inside traction substations and along railway lines: one is to use an independent power through line for power supply. However, the power through line power supply method cannot utilize the regenerative braking energy in the traction power supply system and requires additional independent power supply equipment, resulting in poor overall economy. If power is taken from the traction network through a transformer with a special wiring form to supply the power distribution load, the power supply quality cannot be guaranteed, and there are usually serious power quality problems such as a large voltage fluctuation range and complex harmonic content. The other method is to supply power to the power distribution loads along the railway line by newly building substations. This method is currently mostly used in intercity and suburban railways. Usually, the substation equipment for power distribution load power supply and the traction power supply equipment are built together to form a main substation. However, in fact, the designs of the traction power supply and the power distribution system are relatively independent and resource sharing cannot be achieved.

[0004] The prior art discloses a bilateral through-phase power supply system and control method, which uses a through-phase power supply device to switch between three-phase power supply and single-phase power supply. When the external power supply does not meet the bilateral power supply requirements, the system can still operate in bilateral through-phase mode, improving the catenary voltage level, ensuring the power supply quality while extending the substation spacing, reducing the number of substations, and improving the economy. However, this solution focuses on through-phase power supply and only adjusts the power supply mode under specific conditions, lacking flexibility. In addition, this solution relies on traditional circuit breakers to achieve power supply adjustment under different working conditions, and the control method is single. Finally, this solution is difficult to recover regenerative braking energy, does not meet the access requirements of renewable energy such as solar energy and wind energy, and has a strong dependence on traditional energy sources. Summary of the Invention

[0005] To solve the problems of insufficient system flexibility, single control method and inability to meet the access requirements of new energy in the above-mentioned existing technologies, the present invention proposes a multi-source fusion flexible power conversion device for electrified railway substations, which is compatible with different-phase power supply and in-phase power supply modes, enhancing the flexibility of power conversion; constructs an integrated flexible multi-port power router that integrates traction power supply and power distribution, expands the control method, supports the access of distributed renewable energy, and effectively meets the access requirements of new energy.

[0006] In order to achieve the above technical effects, the technical solution of the present invention is as follows:

[0007] A multi-source fusion flexible power conversion device for electrified railway substations, comprising:

[0008] Three-phase high-voltage incoming line circuit, high-voltage bus circuit, first transformer circuit, second transformer circuit, transformer power supply circuit, third transformer circuit, fourth transformer circuit, first power router circuit, second power router circuit, and a medium-voltage common bus for supplying power to the catenary of train traction loads;

[0009] The three-phase high-voltage incoming line circuit is connected to the input end of the high-voltage bus circuit, and the output ends of the high-voltage bus circuit are respectively connected to the input ends of the first transformer circuit, the second transformer circuit, the transformer power supply circuit, the third transformer circuit, and the fourth transformer circuit. The output ends of the first transformer circuit and the second transformer circuit are respectively connected to the input ends of the first power router circuit, and the output ends of the third transformer circuit and the fourth transformer circuit are respectively connected to the input ends of the second power router circuit. The output ends of the first power router circuit, the transformer power supply circuit, and the second power router circuit are respectively connected to the input ends of the medium-voltage common bus;

[0010] The first power router circuit and the second power router circuit are also connected to distribution loads and distributed new energy devices for supplying power to the distribution loads and exchanging energy with the distributed new energy devices.

[0011] In this technical solution, first, through the three-phase high-voltage incoming line circuit and the high-voltage bus circuit, power is supplied to each transformer circuit and the power router circuits connected to the transformer circuits respectively. The first and second power router circuits are connected to the medium-voltage common bus to supply power to the catenary of train traction loads. The high-voltage bus circuit is also connected to the medium-voltage bus circuit through the transformer power supply circuit. The transformer power supply circuit and the power router cooperate with each other to be compatible with different-phase power supply and in-phase power supply modes, realizing flexible power conversion of electrified railway substations; connecting the wind-solar power generation device to the integrated flexible multi-port power router that integrates traction power supply and power distribution, expanding the control method, supporting the access of distributed renewable energy, realizing the coordinated control of clean energy with train traction loads and power loads, and effectively meeting the access requirements of new energy.

[0012] Preferably, the three-phase high-voltage incoming line circuit includes a first three-phase high-voltage incoming line, a second three-phase high-voltage incoming line, a first high-voltage circuit breaker QFA, and a second high-voltage circuit breaker QFB. One end of the first three-phase high-voltage incoming line is connected to one end of the first high-voltage circuit breaker QFA, one end of the second three-phase high-voltage incoming line is connected to one end of the second high-voltage circuit breaker QFB, and the other ends of the first high-voltage circuit breaker QFA and the second high-voltage circuit breaker QFB are respectively connected to the high-voltage bus circuit.

[0013] Preferably, the high-voltage bus circuit includes a first high-voltage bus, a third high-voltage circuit breaker QFAB, and a second high-voltage bus. The first high-voltage bus is respectively connected to the output end of the first high-voltage circuit breaker QFA, the input end of the first transformer circuit, the input end of the second transformer circuit, the input end of the transformer power supply circuit, and one end of the third high-voltage circuit breaker QFAB. The second high-voltage bus is respectively connected to the output end of the second high-voltage circuit breaker QFB, the input end of the third transformer circuit, the input end of the fourth transformer circuit, the input end of the transformer power supply circuit, and the other end of the third high-voltage circuit breaker QFAB.

[0014] Preferably, the first transformer circuit includes a fourth high-voltage circuit breaker QF1, a first three-phase transformer T1, and a fifth high-voltage circuit breaker QF7. The first high-voltage bus is connected to one end of the fourth high-voltage circuit breaker QF1, the other end of the fourth high-voltage circuit breaker QF1 is connected to the input end of the first three-phase transformer T1, the output end of the first three-phase transformer T1 is connected to one end of the fifth high-voltage circuit breaker QF7, and the other end of the fifth high-voltage circuit breaker QF7 is connected to the first power router circuit.

[0015] Preferably, the second transformer circuit includes a sixth high-voltage circuit breaker QF2 and a second three-phase transformer T2. The first high-voltage bus is connected to one end of the sixth high-voltage circuit breaker QF2, the other end of the sixth high-voltage circuit breaker QF2 is connected to the input end of the second three-phase transformer T2, and the output end of the second three-phase transformer T2 is connected to the first power router circuit.

[0016] Preferably, the transformer power supply circuit includes a seventh high-voltage circuit breaker QF3, an eighth high-voltage circuit breaker QF4, a first single-phase transformer T5, a second single-phase transformer T6, a ninth high-voltage circuit breaker QF-VA1, a tenth high-voltage circuit breaker QF-VB1, an eleventh high-voltage circuit breaker QF-VA2, and a twelfth high-voltage circuit breaker QF-VB2. One end of the seventh high-voltage circuit breaker QF3 is connected to the first high-voltage bus, and the other end of the seventh high-voltage circuit breaker QF3 is connected to the input end of the first single-phase transformer T5. The output end of the first single-phase transformer T5 is respectively connected to one ends of the ninth high-voltage circuit breaker QF-VA1 and the tenth high-voltage circuit breaker QF-VB1. One end of the eighth high-voltage circuit breaker QF4 is connected to the second high-voltage bus, and the other end of the eighth high-voltage circuit breaker QF4 is connected to the input end of the second single-phase transformer T6. The output end of the second single-phase transformer T6 is respectively connected to one ends of the eleventh high-voltage circuit breaker QF-VA2 and the twelfth high-voltage circuit breaker QF-VB2. The other ends of the ninth high-voltage circuit breaker QF-VA1, the tenth high-voltage circuit breaker QF-VB1, the eleventh high-voltage circuit breaker QF-VA2, and the twelfth high-voltage circuit breaker QF-VB2 are respectively connected to the medium-voltage common bus.

[0017] Preferably, the third transformer circuit includes a thirteenth high-voltage circuit breaker QF5 and a third three-phase transformer T3. One end of the second high-voltage bus is connected to the thirteenth high-voltage circuit breaker QF5, and the other end of the thirteenth high-voltage circuit breaker QF5 is connected to the input end of the third three-phase transformer T3. The output end of the fourth three-phase transformer T2 is connected to the second power router circuit.

[0018] Preferably, the fourth transformer circuit includes a fourteenth high-voltage circuit breaker QF6, a fourth three-phase transformer T4, and a fifteenth high-voltage circuit breaker QF8. One end of the second high-voltage bus is connected to the fourteenth high-voltage circuit breaker QF6, and the other end of the fourteenth high-voltage circuit breaker QF6 is connected to the input end of the fourth three-phase transformer T4. The output end of the fourth three-phase transformer T4 is connected to one end of the fifteenth high-voltage circuit breaker QF8, and the other end of the fifteenth high-voltage circuit breaker QF8 is connected to the second power router circuit.

[0019] Preferably, the first power router circuit includes a sixteenth high-voltage circuit breaker QF9, a seventeenth high-voltage circuit breaker QF10, an eighteenth high-voltage circuit breaker QF11, a nineteenth high-voltage circuit breaker QF12, a twentieth high-voltage circuit breaker QF13, a twenty-first high-voltage circuit breaker QF14, a twenty-second high-voltage circuit breaker QF15, a twenty-third high-voltage circuit breaker QF16, a twenty-fourth high-voltage circuit breaker QF25, a fifth three-phase transformer T7, a seventh single-phase transformer T9, a first medium-voltage AC bus, a first medium-low-voltage DC bus, and a first power router;

[0020] The first power router includes a first AC / DC converter C1, a second AC / DC converter C2, a third AC / DC converter C3, and a first DC / DC converter C4;

[0021] The distributed new energy device includes a substation wind-solar power generation device and a new energy storage equipment;

[0022] The first medium-voltage AC bus is respectively connected to the other end of the fifth high-voltage circuit breaker QF7, the sixteenth high-voltage circuit breaker QF9, the seventeenth high-voltage circuit breaker QF10, the eighteenth high-voltage circuit breaker QF11, and the nineteenth high-voltage circuit breaker QF12. The other end of the sixteenth high-voltage circuit breaker QF9 is connected to the new energy storage equipment. The other end of the seventeenth high-voltage circuit breaker QF10 is connected to the wind-solar power generation device. The other end of the eighteenth high-voltage circuit breaker QF11 is connected to the substation distribution load. The other end of the nineteenth high-voltage circuit breaker QF12 is connected to the input end of the fifth three-phase transformer T7. The output end of the fifth three-phase transformer T7 is connected to the AC end of the first AC / DC converter C1. The AC end of the second AC / DC converter C2 is connected to the output end of the second three-phase transformer T2. The DC end of the first AC / DC converter C1, the DC end of the second AC / DC converter C2, the DC end of the third AC / DC converter C3, and one DC end of the first DC / DC converter C4 are respectively connected to a DC bus. The other DC end of the first DC / DC converter C4 is connected to one end of the twentieth high-voltage circuit breaker QF13. The other end of the twentieth high-voltage circuit breaker QF13, one end of the twenty-first high-voltage circuit breaker QF14, one end of the twenty-second high-voltage circuit breaker QF15, and one end of the twenty-third high-voltage circuit breaker QF16 are respectively connected to the first medium-low voltage DC bus. The other end of the twenty-first high-voltage circuit breaker QF14 is connected to the new energy storage equipment. The other end of the twenty-second high-voltage circuit breaker QF15 is connected to the wind-solar power generation device. The other end of the twenty-third high-voltage circuit breaker QF16 is connected to the substation distribution load. The AC end of the third AC / DC converter C3 is connected to the input end of the seventh three-phase transformer T9. The output end of the seventh single-phase transformer T9 is connected to one end of the twenty-fourth high-voltage circuit breaker QF25. The other end of the twenty-fourth high-voltage circuit breaker QF25 is connected to the medium-voltage common bus;

[0023] The second power router circuit includes the twenty-fifth high-voltage circuit breaker QF24, the twenty-sixth high-voltage circuit breaker QF23, the twenty-seventh high-voltage circuit breaker QF22, the twenty-eighth high-voltage circuit breaker QF21, the twenty-ninth high-voltage circuit breaker QF20, the thirtieth high-voltage circuit breaker QF19, the thirty-first high-voltage circuit breaker QF18, the thirty-second high-voltage circuit breaker QF17, the thirty-third high-voltage circuit breaker QF26, the sixth three-phase transformer T8, the eighth single-phase transformer T10, the second medium-voltage AC bus, the second medium- and low-voltage DC bus, and the second power router;

[0024] The second power router includes the second DC / DC converter C5, the fourth AC / DC converter C6, the fifth AC / DC converter C7, and the sixth AC / DC converter C8;

[0025] The second medium-voltage AC bus is respectively connected to the other end of the fifteenth high-voltage circuit breaker QF8, one end of the twenty-fifth high-voltage circuit breaker QF24, one end of the twenty-sixth high-voltage circuit breaker QF23, one end of the twenty-seventh high-voltage circuit breaker QF22, and one end of the twenty-eighth high-voltage circuit breaker QF21. The other end of the twenty-fifth high-voltage circuit breaker QF24 is connected to the substation distribution load. The other end of the twenty-sixth high-voltage circuit breaker QF23 is connected to the wind-solar power generation device. The other end of the twenty-seventh high-voltage circuit breaker QF22 is connected to the new energy storage equipment. The other end of the twenty-eighth high-voltage circuit breaker QF21 is connected to the input end of the sixth three-phase transformer T8. The output end of the sixth three-phase transformer T8 is connected to the AC end of the sixth AC / DC converter C8. The AC end of the fourth AC / DC converter C6 is connected to the output end of the third three-phase transformer T3. One DC end of the second DC / DC converter C5, the DC end of the fourth AC / DC converter C6, the DC end of the fifth AC / DC converter C7, and the DC end of the sixth AC / DC converter C8 are respectively connected to a DC bus. The other DC end of the second DC / DC converter C5 is connected to one end of the twenty-ninth high-voltage circuit breaker QF20. The other end of the twenty-ninth high-voltage circuit breaker QF20, one end of the thirtieth high-voltage circuit breaker QF19, one end of the thirty-first high-voltage circuit breaker QF18, and one end of the thirty-second high-voltage circuit breaker QF17 are respectively connected to the second medium- and low-voltage DC bus. The other end of the thirtieth high-voltage circuit breaker QF19 is connected to the new energy storage equipment. The other end of the thirty-first high-voltage circuit breaker QF18 is connected to the wind-solar power generation device. The other end of the thirty-second high-voltage circuit breaker QF17 is connected to the substation distribution load. The AC end of the fifth AC / DC converter C7 is connected to the input end of the eighth single-phase transformer T10. The output end of the eighth single-phase transformer T10 is connected to one end of the thirty-third high-voltage circuit breaker QF26. The other end of the thirty-third high-voltage circuit breaker QF26 is connected to the medium-voltage common bus.

[0026] Preferably, the medium-voltage common busbar includes a first medium-voltage common busbar, a thirty-fourth high-voltage circuit breaker QF27, a second medium-voltage common busbar, a thirty-fifth high-voltage circuit breaker QF28, and a thirty-sixth high-voltage circuit breaker QF29. The first medium-voltage common busbar is respectively connected to the other end of the twenty-fourth high-voltage circuit breaker QF25, the other end of the ninth high-voltage circuit breaker QF-VA1, the other end of the tenth high-voltage circuit breaker QF-VB1, one end of the thirty-third high-voltage circuit breaker QF27, and one end of the thirty-fourth high-voltage circuit breaker QF28. The second medium-voltage common busbar is respectively connected to the other end of the eleventh high-voltage circuit breaker QF-VA2, the other end of the twelfth high-voltage circuit breaker QF-VB2, the other end of the thirty-third high-voltage circuit breaker QF26, the other end of the thirty-third high-voltage circuit breaker QF27, and one end of the thirty-fifth high-voltage circuit breaker QF29;

[0027] The other end of the thirty-fourth high-voltage circuit breaker QF28 is connected to the other end of the thirty-fifth high-voltage circuit breaker QF29 to contact the catenary of the train traction load.

[0028] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows:

[0029] The present invention provides a multi-source fusion flexible power conversion device for an electrified railway substation. Firstly, through a three-phase high-voltage incoming line circuit and a high-voltage busbar circuit, power is supplied to each transformer circuit and the power router circuit connected to the transformer circuit respectively. The first and second power router circuits are connected to the medium-voltage common busbar to supply power to the catenary of the train traction load. The high-voltage busbar circuit is also connected to the medium-voltage busbar circuit through a transformer power supply circuit. The transformer power supply circuit and the power router cooperate with each other to be compatible with different-phase power supply and same-phase power supply modes, realizing flexible power conversion of the electrified railway substation; the wind-solar power generation device is connected to an integrated flexible multi-port power router that integrates traction power supply and power distribution, expanding the control method, supporting the access of distributed renewable energy, and realizing the coordinated control of clean energy with the train traction load and the power load, effectively adapting to the access requirements of new energy. Description of the Drawings

[0030] Figure 1 It shows a schematic structural diagram of a multi-source fusion flexible power conversion device for an electrified railway substation proposed in Embodiment 1 of the present invention;

[0031] Figure 2 It shows another schematic structural diagram of a multi-source fusion flexible power conversion device for an electrified railway substation proposed in Embodiment 2 of the present invention.

[0032] 1. Three-phase high-voltage incoming line circuit; 2. High-voltage bus circuit; 3. First transformer circuit; 4. Second transformer circuit; 5. Transformer power supply circuit; 6. Third transformer circuit; 7. Fourth transformer circuit; 8. First power router circuit; 9. Second power router circuit; 10. Medium-voltage common bus. Detailed implementation manner

[0033] The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent;

[0034] For better illustration of this embodiment, some parts of the accompanying drawings are omitted, enlarged or reduced, and do not represent the actual size;

[0035] For those skilled in the art, it is understandable that some well-known content descriptions in the accompanying drawings may be omitted.

[0036] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] The description of the positional relationship in the accompanying drawings is only for illustrative purposes and should not be construed as a limitation of this patent;

[0038] Embodiment 1

[0039] This embodiment proposes a multi-source fusion flexible substation device for electrified railway substations. The structural schematic diagram of the device is as Figure 1 shown, including:

[0040] Three-phase high-voltage incoming line circuit 1, high-voltage bus circuit 2, first transformer circuit 3, second transformer circuit 4, transformer power supply circuit 5, third transformer circuit 6, fourth transformer circuit 7, first power router circuit 8, second power router circuit 9, and a medium-voltage common bus 10 for supplying power to the catenary of train traction loads;

[0041] The three-phase high-voltage incoming line circuit 1 is connected to the input end of the high-voltage bus circuit 2. The output end of the high-voltage bus circuit 2 is respectively connected to the input ends of the first transformer circuit 3, the second transformer circuit 4, the transformer power supply circuit 5, the third transformer circuit 6, and the fourth transformer circuit 7. The output ends of the first transformer circuit 3 and the second transformer circuit 4 are respectively connected to the input end of the first power router circuit 8. The output ends of the third transformer circuit 6 and the fourth transformer circuit 7 are respectively connected to the input end of the second power router circuit 9. The output ends of the first power router circuit 8, the transformer power supply circuit 5, and the second power router circuit 9 are respectively connected to the input end of the medium-voltage common bus 10;

[0042] The first power router circuit 8 and the second power router circuit 9 are also connected to the distribution load and the distributed new energy device, and are used for supplying power to the distribution load and performing energy exchange with the distributed new energy device.

[0043] In this embodiment, first, through the three-phase high-voltage incoming line circuit and the high-voltage bus circuit, power is supplied to each transformer circuit and the power router circuit connected to the transformer circuit respectively. The first and second power router circuits are connected to the medium-voltage common bus to supply power to the catenary of the train traction load. The high-voltage bus circuit is also connected to the medium-voltage bus circuit through the transformer power supply circuit. The transformer power supply circuit cooperates with the power router to be compatible with the different-phase power supply and the same-phase power supply methods of the traction substation, realizing flexible power transformation of the electrified railway substation; the wind-solar power generation device is connected to the integrated flexible multi-port power router that integrates traction power supply and power distribution, expanding the control method, supporting the access of distributed renewable energy, realizing the coordinated control of clean energy with the train traction load and the power load, and effectively meeting the access requirements of new energy.

[0044] Embodiment 2

[0045] In this embodiment, for the convenience of understanding, the explanations of some technical terms involved are as follows:

[0046] Electromagnetic loop network: An electromagnetic loop network refers to the parallel operation of two groups of lines with different voltage levels through the connection of the magnetic circuits of the transformers at both ends. The load transfer caused by the disconnection of the high-voltage line in the high-low voltage electromagnetic loop network is very likely to cause the expansion of the accident and the destruction of system stability, and the electromagnetic loop network will increase the system short-circuit current.

[0047] Power router: A multi-port intelligent power management device based on high-power variable current and its control technology, used for efficiently distributing and controlling the flow of electric energy between multiple nodes.

[0048] Catenary of train traction load: An overhead wire system that supplies electric energy to the locomotive through a pantograph, mainly composed of poles, foundations, support structures, and catenary suspension, etc.

[0049] See Figure 2 , in this embodiment, the three-phase high-voltage incoming line circuit 1 includes a first three-phase high-voltage incoming line, a second three-phase high-voltage incoming line, a first high-voltage circuit breaker QFA, and a second high-voltage circuit breaker QFB. One end of the first three-phase high-voltage incoming line is connected to one end of the first high-voltage circuit breaker QFA, one end of the second three-phase high-voltage incoming line is connected to one end of the second high-voltage circuit breaker QFB, and the other ends of the first high-voltage circuit breaker QFA and the second high-voltage circuit breaker QFB are respectively connected to the high-voltage bus circuit 2;

[0050] Specifically, the first three-phase high-voltage incoming line and the second three-phase high-voltage incoming line are 220 kV or 110 kV three-phase incoming lines.

[0051] See Figure 2, in this embodiment, the high-voltage bus circuit 2 includes a first high-voltage bus, a third high-voltage circuit breaker QFAB, and a second high-voltage bus. The first high-voltage bus is respectively connected to the output end of the first high-voltage circuit breaker QFA, the input end of the first transformer circuit 3, the input end of the second transformer circuit 4, the input end of the transformer power supply circuit 5, and one end of the third high-voltage circuit breaker QFAB. The second high-voltage bus is respectively connected to the output end of the second high-voltage circuit breaker QFB, the input end of the third transformer circuit 6, the input end of the fourth transformer circuit 7, the input end of the transformer power supply circuit 5, and the other end of the third high-voltage circuit breaker QFAB;

[0052] Specifically, the first high-voltage bus and the second high-voltage bus are 220 kV or 110 kV high-voltage buses.

[0053] See Figure 2 , in this embodiment, the first transformer circuit 3 includes a fourth high-voltage circuit breaker QF1, a first three-phase transformer T1, and a fifth high-voltage circuit breaker QF7. The first high-voltage bus is connected to one end of the fourth high-voltage circuit breaker QF1. The other end of the fourth high-voltage circuit breaker QF1 is connected to the input end of the first three-phase transformer T1. The output end of the first three-phase transformer T1 is connected to one end of the fifth high-voltage circuit breaker QF7. The other end of the fifth high-voltage circuit breaker QF7 is connected to the first power router circuit 8.

[0054] See Figure 2 , in this embodiment, the second transformer circuit 4 includes a sixth high-voltage circuit breaker QF2 and a second three-phase transformer T2. The first high-voltage bus is connected to one end of the sixth high-voltage circuit breaker QF2. The other end of the sixth high-voltage circuit breaker QF2 is connected to the input end of the second three-phase transformer T2. The output end of the second three-phase transformer T2 is connected to the first power router circuit 8.

[0055] See Figure 2, in this embodiment, the transformer power supply circuit 5 includes a seventh high-voltage circuit breaker QF3, an eighth high-voltage circuit breaker QF4, a first single-phase transformer T5, a second single-phase transformer T6, a ninth high-voltage circuit breaker QF-VA1, a tenth high-voltage circuit breaker QF-VB1, an eleventh high-voltage circuit breaker QF-VA2, and a twelfth high-voltage circuit breaker QF-VB2. One end of the seventh high-voltage circuit breaker QF3 is connected to the first high-voltage bus, and the other end of the seventh high-voltage circuit breaker QF3 is connected to the input end of the first single-phase transformer T5. The output end of the first single-phase transformer T5 is respectively connected to one ends of the ninth high-voltage circuit breaker QF-VA1 and the tenth high-voltage circuit breaker QF-VB1. One end of the eighth high-voltage circuit breaker QF4 is connected to the second high-voltage bus, and the other end of the eighth high-voltage circuit breaker QF4 is connected to the input end of the second single-phase transformer T6. The output end of the second single-phase transformer T6 is respectively connected to one ends of the eleventh high-voltage circuit breaker QF-VA2 and the twelfth high-voltage circuit breaker QF-VB2. The other ends of the ninth high-voltage circuit breaker QF-VA1, the tenth high-voltage circuit breaker QF-VB1, the eleventh high-voltage circuit breaker QF-VA2, and the twelfth high-voltage circuit breaker QF-VB2 are respectively connected to the medium-voltage common bus 10.

[0056] See Figure 2 , in this embodiment, the third transformer circuit 6 includes a thirteenth high-voltage circuit breaker QF5 and a third three-phase transformer T3. The second high-voltage bus is connected to one end of the thirteenth high-voltage circuit breaker QF5, and the other end of the thirteenth high-voltage circuit breaker QF5 is connected to the input end of the third three-phase transformer T3. The output end of the third three-phase transformer T3 is connected to the second power router circuit 9.

[0057] See Figure 2 , in this embodiment, the fourth transformer circuit 7 includes a fourteenth high-voltage circuit breaker QF6, a fourth three-phase transformer T4, and a fifteenth high-voltage circuit breaker QF8. The second high-voltage bus is connected to one end of the fourteenth high-voltage circuit breaker QF6, and the other end of the fourteenth high-voltage circuit breaker QF6 is connected to the input end of the fourth three-phase transformer T4. The output end of the fourth three-phase transformer T4 is connected to one end of the fifteenth high-voltage circuit breaker QF8, and the other end of the fifteenth high-voltage circuit breaker QF8 is connected to the second power router circuit 9.

[0058] See Figure 2, in this embodiment, the first power router circuit 8 includes the sixteenth high-voltage circuit breaker QF9, the seventeenth high-voltage circuit breaker QF10, the eighteenth high-voltage circuit breaker QF11, the nineteenth high-voltage circuit breaker QF12, the twentieth high-voltage circuit breaker QF13, the twenty-first high-voltage circuit breaker QF14, the twenty-second high-voltage circuit breaker QF15, the twenty-third high-voltage circuit breaker QF16, the twenty-fourth high-voltage circuit breaker QF25, the fifth three-phase transformer T7, the seventh single-phase transformer T9, the first medium-voltage AC bus, the first medium-low-voltage DC bus, and the first power router;

[0059] The first power router includes a first AC / DC converter C1, a second AC / DC converter C2, a third AC / DC converter C3, and a first DC / DC converter C4;

[0060] The distributed new energy device includes a substation wind-solar power generation device and a new energy storage device;

[0061] The other end of the first medium-voltage AC bus is respectively connected to the other end of the fifth high-voltage circuit breaker QF7, the sixteenth high-voltage circuit breaker QF9, the seventeenth high-voltage circuit breaker QF10, the eighteenth high-voltage circuit breaker QF11, and the nineteenth high-voltage circuit breaker QF12. The other end of the sixteenth high-voltage circuit breaker QF9 is connected to the new energy storage equipment. The other end of the seventeenth high-voltage circuit breaker QF10 is connected to the wind-solar power generation device. The other end of the eighteenth high-voltage circuit breaker QF11 is connected to the substation distribution load. The other end of the nineteenth high-voltage circuit breaker QF12 is connected to the input end of the fifth three-phase transformer T7. The output end of the fifth three-phase transformer T7 is connected to the AC end of the first AC / DC converter C1. The AC end of the second AC / DC converter C2 is connected to the output end of the second three-phase transformer T2. The DC end of the first AC / DC converter C1, the DC end of the second AC / DC converter C2, the DC end of the third AC / DC converter C3, and one DC end of the first DC / DC converter C4 are respectively connected to a DC bus. The other DC end of the first DC / DC converter C4 is connected to one end of the twentieth high-voltage circuit breaker QF13. The other end of the twentieth high-voltage circuit breaker QF13, one end of the twenty-first high-voltage circuit breaker QF14, one end of the twenty-second high-voltage circuit breaker QF15, and one end of the twenty-third high-voltage circuit breaker QF16 are respectively connected to the first medium-low voltage DC bus. The other end of the twenty-first high-voltage circuit breaker QF14 is connected to the new energy storage equipment. The other end of the twenty-second high-voltage circuit breaker QF15 is connected to the wind-solar power generation device. The other end of the twenty-third high-voltage circuit breaker QF16 is connected to the substation distribution load. The AC end of the third AC / DC converter C3 is connected to the input end of the seventh single-phase transformer T9. The output end of the seventh single-phase transformer T9 is connected to one end of the twenty-fourth high-voltage circuit breaker QF25. The other end of the twenty-fourth high-voltage circuit breaker QF25 is connected to the medium-voltage common bus 10;

[0062] The second power router circuit 9 includes the twenty-fifth high-voltage circuit breaker QF24, the twenty-sixth high-voltage circuit breaker QF23, the twenty-seventh high-voltage circuit breaker QF22, the twenty-eighth high-voltage circuit breaker QF21, the twenty-ninth high-voltage circuit breaker QF20, the thirtieth high-voltage circuit breaker QF19, the thirty-first high-voltage circuit breaker QF18, the thirty-second high-voltage circuit breaker QF17, the thirty-third high-voltage circuit breaker QF26, the sixth three-phase transformer T8, the eighth single-phase transformer T10, the second medium-voltage AC bus, the second medium-low voltage DC bus, and the second power router;

[0063] The second power router includes the second DC / DC converter C5, the fourth AC / DC converter C6, the fifth AC / DC converter C7, and the sixth AC / DC converter C8;

[0064] The second medium-voltage AC bus is respectively connected to the other end of the fifteenth high-voltage circuit breaker QF8, the twenty-fifth high-voltage circuit breaker QF24, the twenty-sixth high-voltage circuit breaker QF23, the twenty-seventh high-voltage circuit breaker QF22, and the one end of the twenty-eighth high-voltage circuit breaker QF21. The other end of the twenty-fifth high-voltage circuit breaker QF24 is connected to the substation distribution load. The other end of the twenty-sixth high-voltage circuit breaker QF23 is connected to the wind-solar power generation device. The other end of the twenty-seventh high-voltage circuit breaker QF22 is connected to the new energy storage equipment. The other end of the twenty-eighth high-voltage circuit breaker QF21 is connected to the input end of the sixth three-phase transformer T8. The output end of the sixth three-phase transformer T8 is connected to the AC end of the sixth AC / DC converter C8. The AC end of the fourth AC / DC converter C6 is connected to the output end of the third three-phase transformer T3. One DC end of the second DC / DC converter C5, the DC end of the fourth AC / DC converter C6, the DC end of the fifth AC / DC converter C7, and the DC end of the sixth AC / DC converter C8 are respectively connected to a DC bus. The other DC end of the second DC / DC converter C5 is connected to one end of the twenty-ninth high-voltage circuit breaker QF20. The other end of the twenty-ninth high-voltage circuit breaker QF20, one end of the thirtieth high-voltage circuit breaker QF19, one end of the thirty-first high-voltage circuit breaker QF18, and one end of the thirty-second high-voltage circuit breaker QF17 are respectively connected to the second medium-low voltage DC bus. The other end of the thirtieth high-voltage circuit breaker QF19 is connected to the new energy storage equipment. The other end of the thirty-first high-voltage circuit breaker QF18 is connected to the wind-solar power generation device. The other end of the thirty-second high-voltage circuit breaker QF17 is connected to the substation distribution load. The AC end of the fifth AC / DC converter C7 is connected to the input end of the eighth single-phase transformer T10. The output end of the eighth single-phase transformer T10 is connected to one end of the thirty-third high-voltage circuit breaker QF26. The other end of the thirty-third high-voltage circuit breaker QF26 is connected to the medium-voltage common bus 10.

[0065] Specifically, the first medium-voltage AC bus and the second medium-voltage AC bus are 35KV medium-voltage AC buses, and the first medium-low voltage DC bus and the second medium-low voltage DC bus are 750 / 1500 / 3000V medium-low voltage DC buses;

[0066] See Figure 2, in this embodiment, the medium-voltage common bus 10 includes a first medium-voltage common bus, a thirty-fourth high-voltage circuit breaker QF27, a second medium-voltage common bus, a thirty-fifth high-voltage circuit breaker QF28, and a thirty-sixth high-voltage circuit breaker QF29. The first medium-voltage common bus is respectively connected to the other end of the twenty-fourth high-voltage circuit breaker QF25, the other end of the ninth high-voltage circuit breaker QF-VA1, the other end of the tenth high-voltage circuit breaker QF-VB1, one end of the thirty-third high-voltage circuit breaker QF27, and one end of the thirty-fourth high-voltage circuit breaker QF28. The second medium-voltage common bus is respectively connected to the other end of the eleventh high-voltage circuit breaker QF-VA2, the other end of the twelfth high-voltage circuit breaker QF-VB2, the other end of the thirty-third high-voltage circuit breaker QF26, the other end of the thirty-third high-voltage circuit breaker QF27, and one end of the thirty-fifth high-voltage circuit breaker QF29;

[0067] The other end of the thirty-fourth high-voltage circuit breaker QF28 is connected to the other end of the thirty-fifth high-voltage circuit breaker QF29 to the catenary of the train traction load;

[0068] Specifically, the first medium-voltage common bus and the second medium-voltage common bus are 27.5KV medium-voltage common buses.

[0069] Specifically, the multi-source fusion flexible power conversion device is compatible with the different-phase power supply and the same-phase power supply modes. The control method of the different-phase power supply mode is:

[0070] The high-voltage switch QF27 between the first medium-voltage common bus and the second medium-voltage common bus is in the open state. Only one of the two single-phase transformers T5 and T6 is in the running state to avoid forming a fixed electromagnetic loop network;

[0071] The first power router detects the power of the first three-phase transformer T1, the second three-phase transformer T2, the first single-phase transformer T5, the second single-phase transformer T6, the fifth three-phase transformer T7, and the seventh single-phase transformer T9 in real time. Through real-time and appropriate control, it uniformly adjusts the power of the AC ports of the first AC / DC converter C1, the second AC / DC converter C2, and the third AC / DC converter C3 of the first power router and the voltage of the first medium- and low-voltage DC bus to meet the safe, reliable, and efficient power supply / consumption requirements of the traction load, the power matching load, and the distributed new energy power generation.

[0072] The second power router detects in real time the power magnitudes of the third three-phase transformer T3, the fourth three-phase transformer T4, the first single-phase transformer T5, the second single-phase transformer T6, the sixth three-phase transformer T8, and the eighth single-phase transformer T10. Through real-time and adaptive control, it uniformly adjusts the power magnitudes of the AC ports of the three AC / DC converters C6, C7, and C8 of the second power router and the voltage of the second medium-voltage DC bus to meet the safe, reliable, and efficient power supply / consumption demands of traction loads, power-assisted loads, and distributed new energy generation.

[0073] Specifically, the control method of the in-phase power supply mode is as follows:

[0074] The high-voltage switch QF27 between the first medium-voltage common bus and the second medium-voltage common bus is in the closed state. Only one of the two single-phase transformers T5 and T6 is in the operating state, and only one low-voltage side winding of the traction transformer in the operating state supplies power to the medium-voltage common bus. That is, when QF-VA1 or QF-VA2 is in the closed state, QF-VB1 and QF-VB2 must both be in the open state to avoid out-of-phase short circuit of the traction transformer.

[0075] The first power router detects in real time the power magnitudes of the first three-phase transformer T1, the second three-phase transformer T2, the first single-phase transformer T5, the second single-phase transformer T6, the fifth three-phase transformer T7, and the seventh single-phase transformer T9. Through real-time and adaptive control, it uniformly adjusts the power magnitudes of the AC ports of the first AC / DC converter C1, the second AC / DC converter C2, and the third AC / DC converter C3 of the first power router and the voltage of the first medium-voltage DC bus to meet the safe, reliable, and efficient power supply / consumption demands of traction loads, power-assisted loads, and distributed new energy generation.

[0076] The second power router detects in real time the power magnitudes of the third three-phase transformer T3, the fourth three-phase transformer T4, the first single-phase transformer T5, the second single-phase transformer T6, the sixth three-phase transformer T8, and the eighth single-phase transformer T10. Through real-time and adaptive control, it uniformly adjusts the power magnitudes of the AC ports of the three AC / DC converters C6, C7, and C8 of the second power router and the voltage of the second medium-voltage DC bus to meet the safe, reliable, and efficient power supply / consumption demands of traction loads, power-assisted loads, and distributed new energy generation.

[0077] The first power router and the second power router are connected in parallel through the third AC / DC converter C3 and the fifth AC / DC converter C7 and via the first medium-voltage common bus and the second medium-voltage common bus to perform unified power flow control and energy management for the multi-source integrated flexible substation.

[0078] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. For example, the three-phase matching transformer in the power router has various wiring forms, and a split transformer or a non-split transformer can be used. The single-phase matching transformer in the power router can also use a split transformer or a non-split transformer. The multi-port converter in the power router has various topology schemes, such as two-level and three-level AC-DC-AC conversion topologies, high-voltage cascaded topologies, and high-voltage modular multilevel back-to-back topologies. As long as the topology can achieve multi-port AC-DC (including DC-DC) power conversion, it can meet the power conversion requirements of the power router. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A multi-source fusion flexible power conversion device for an electrified railway substation, characterized in that, Comprising: A three-phase high-voltage incoming line circuit (1), a high-voltage bus circuit (2), a first transformer circuit (3), a second transformer circuit (4), a transformer power supply circuit (5), a third transformer circuit (6), a fourth transformer circuit (7), a first power router circuit (8), a second power router circuit (9), and a medium-voltage common bus (10) for supplying power to the catenary of the train traction load; The input end of the three-phase high-voltage incoming line circuit (1) is connected to the input end of the high-voltage bus circuit (2), and the output ends of the high-voltage bus circuit (2) are respectively connected to the input ends of the first transformer circuit (3), the second transformer circuit (4), the transformer power supply circuit (5), the third transformer circuit (6), and the fourth transformer circuit (7). The output ends of the first transformer circuit (3) and the second transformer circuit (4) are respectively connected to the input end of the first power router circuit (8). The output ends of the third transformer circuit (6) and the fourth transformer circuit (7) are respectively connected to the input end of the second power router circuit (9). The output ends of the first power router circuit (8), the transformer power supply circuit (5), and the second power router circuit (9) are respectively connected to the input end of the medium-voltage common bus (10); The first power router circuit (8) and the second power router circuit (9) are also connected to the distribution load and the distributed new energy device, and are used for supplying power to the distribution load and exchanging energy with the distributed new energy device.

2. The multi-source fusion flexible power conversion device for an electrified railway substation according to claim 1, wherein The three-phase high-voltage incoming line circuit (1) includes a first three-phase high-voltage incoming line, a second three-phase high-voltage incoming line, a first high-voltage circuit breaker QFA, and a second high-voltage circuit breaker QFB. One end of the first three-phase high-voltage incoming line is connected to one end of the first high-voltage circuit breaker QFA, and one end of the second three-phase high-voltage incoming line is connected to one end of the second high-voltage circuit breaker QFB. The other ends of the first high-voltage circuit breaker QFA and the second high-voltage circuit breaker QFB are respectively connected to the high-voltage bus circuit (2).

3. The multi-source integrated flexible power conversion device for electrified railway substations according to claim 2, characterized in that, The high-voltage bus circuit (2) includes a first high-voltage bus, a third high-voltage circuit breaker QFAB, and a second high-voltage bus. The first high-voltage bus is respectively connected to the output end of the first high-voltage circuit breaker QFA, the input end of the first transformer circuit (3), the input end of the second transformer circuit (4), the input end of the transformer power supply circuit (5), and one end of the third high-voltage circuit breaker QFAB. The second high-voltage bus is respectively connected to the output end of the second high-voltage circuit breaker QFB, the input end of the third transformer circuit (6), the input end of the fourth transformer circuit (7), the input end of the transformer power supply circuit (5), and the other end of the third high-voltage circuit breaker QFAB.

4. The multi-source fusion flexible power conversion device for an electrified railway substation according to claim 3, wherein, The first transformer circuit (3) includes a fourth high-voltage circuit breaker QF1, a first three-phase transformer T1, and a fifth high-voltage circuit breaker QF7. The first high-voltage bus is connected to one end of the fourth high-voltage circuit breaker QF1. The other end of the fourth high-voltage circuit breaker QF1 is connected to the input end of the first three-phase transformer T1. The output end of the first three-phase transformer T1 is connected to one end of the fifth high-voltage circuit breaker QF7. The other end of the fifth high-voltage circuit breaker QF7 is connected to the first power router circuit (8).

5. The multi-source fusion flexible power conversion device for an electrified railway substation according to claim 3, wherein The second transformer circuit (4) includes a sixth high-voltage circuit breaker QF2 and a second three-phase transformer T2. One end of the first high-voltage bus is connected to one end of the sixth high-voltage circuit breaker QF2, the other end of the sixth high-voltage circuit breaker QF2 is connected to the input end of the second three-phase transformer T2, and the output end of the second three-phase transformer T2 is connected to the first power router circuit (8).

6. The flexible power conversion device for multi-source integration of an electrified railway substation according to claim 3, wherein The transformer power supply circuit (5) includes a seventh high-voltage circuit breaker QF3, an eighth high-voltage circuit breaker QF4, a first single-phase transformer T5, a second single-phase transformer T6, a ninth high-voltage circuit breaker QF-VA1, a tenth high-voltage circuit breaker QF-VB1, an eleventh high-voltage circuit breaker QF-VA2, and a twelfth high-voltage circuit breaker QF-VB2. One end of the seventh high-voltage circuit breaker QF3 is connected to the first high-voltage bus, the other end of the seventh high-voltage circuit breaker QF3 is connected to the input end of the first single-phase transformer T5, and the output end of the first single-phase transformer T5 is respectively connected to one ends of the ninth high-voltage circuit breaker QF-VA1 and the tenth high-voltage circuit breaker QF-VB1. One end of the eighth high-voltage circuit breaker QF4 is connected to the second high-voltage bus, the other end of the eighth high-voltage circuit breaker QF4 is connected to the input end of the second single-phase transformer T6, and the output end of the second single-phase transformer T6 is respectively connected to one ends of the eleventh high-voltage circuit breaker QF-VA2 and the twelfth high-voltage circuit breaker QF-VB2. The other ends of the ninth high-voltage circuit breaker QF-VA1, the tenth high-voltage circuit breaker QF-VB1, the eleventh high-voltage circuit breaker QF-VA2, and the twelfth high-voltage circuit breaker QF-VB2 are respectively connected to the medium-voltage common bus (10).

7. The flexible substation device with multi-source integration for an electrified railway substation according to claim 3, characterized in that, The third transformer circuit (6) includes a thirteenth high-voltage circuit breaker QF5 and a third three-phase transformer T3. One end of the second high-voltage bus is connected to one end of the thirteenth high-voltage circuit breaker QF5, the other end of the thirteenth high-voltage circuit breaker QF5 is connected to the input end of the third three-phase transformer T3, and the output end of the third three-phase transformer T3 is connected to the second power router circuit (9).

8. The multi-source integrated flexible power conversion device for an electrified railway substation according to claim 3, wherein The fourth transformer circuit (7) includes a fourteenth high-voltage circuit breaker QF6, a fourth three-phase transformer T4, and a fifteenth high-voltage circuit breaker QF8. One end of the second high-voltage bus is connected to one end of the fourteenth high-voltage circuit breaker QF6, the other end of the fourteenth high-voltage circuit breaker QF6 is connected to the input end of the fourth three-phase transformer T4, the output end of the fourth three-phase transformer T4 is connected to one end of the fifteenth high-voltage circuit breaker QF8, and the other end of the fifteenth high-voltage circuit breaker QF8 is connected to the second power router circuit (9).

9. A multi-source integrated flexible power conversion device for an electrified railway substation according to any one of claims 4-8, characterized in that The first power router circuit (8) includes a sixteenth high-voltage circuit breaker QF9, a seventeenth high-voltage circuit breaker QF10, an eighteenth high-voltage circuit breaker QF11, a nineteenth high-voltage circuit breaker QF12, a twentieth high-voltage circuit breaker QF13, a twenty-first high-voltage circuit breaker QF14, a twenty-second high-voltage circuit breaker QF15, a twenty-third high-voltage circuit breaker QF16, a twenty-fourth high-voltage circuit breaker QF25, a fifth three-phase transformer T7, a seventh single-phase transformer T9, a first medium-voltage AC bus, a first medium-low-voltage DC bus, and a first power router; The first power router includes a first AC / DC converter C1, a second AC / DC converter C2, a third AC / DC converter C3, and a first DC / DC converter C4; The distributed new energy device includes a substation wind-solar power generation device and a new energy storage equipment; The first medium-voltage AC bus is respectively connected to the other end of the fifth high-voltage circuit breaker QF7, the sixteenth high-voltage circuit breaker QF9, the seventeenth high-voltage circuit breaker QF10, the eighteenth high-voltage circuit breaker QF11, and the nineteenth high-voltage circuit breaker QF12. The other end of the sixteenth high-voltage circuit breaker QF9 is connected to the new energy storage equipment, the other end of the seventeenth high-voltage circuit breaker QF10 is connected to the wind-solar power generation device, the other end of the eighteenth high-voltage circuit breaker QF11 is connected to the substation distribution load, the other end of the nineteenth high-voltage circuit breaker QF12 is connected to the input end of the fifth three-phase transformer T7, the output end of the fifth three-phase transformer T7 is connected to the AC end of the first AC / DC converter C1, the AC end of the second AC / DC converter C2 is connected to the output end of the second three-phase transformer T2, the DC end of the first AC / DC converter C1, the DC end of the second AC / DC converter C2, the DC end of the third AC / DC converter C3, and one DC end of the first DC / DC converter C4 are respectively connected to a DC bus. The other DC end of the first DC / DC converter C4 is connected to one end of the twentieth high-voltage circuit breaker QF13. The other end of the twentieth high-voltage circuit breaker QF13, one end of the twenty-first high-voltage circuit breaker QF14, one end of the twenty-second high-voltage circuit breaker QF15, and one end of the twenty-third high-voltage circuit breaker QF16 are respectively connected to the first medium-low voltage DC bus. The other end of the twenty-first high-voltage circuit breaker QF14 is connected to the new energy storage equipment, the other end of the twenty-second high-voltage circuit breaker QF15 is connected to the wind-solar power generation device, the other end of the twenty-third high-voltage circuit breaker QF16 is connected to the substation distribution load. The AC end of the third AC / DC converter C3 is connected to the input end of the seventh single-phase transformer T9, the output end of the seventh single-phase transformer T9 is connected to one end of the twenty-fourth high-voltage circuit breaker QF25, and the other end of the twenty-fourth high-voltage circuit breaker QF25 is connected to the medium-voltage common bus (10); The second power router circuit (9) includes a twenty-fifth high-voltage circuit breaker QF24, a twenty-sixth high-voltage circuit breaker QF23, a twenty-seventh high-voltage circuit breaker QF22, a twenty-eighth high-voltage circuit breaker QF21, a twenty-ninth high-voltage circuit breaker QF20, a thirtieth high-voltage circuit breaker QF19, a thirty-first high-voltage circuit breaker QF18, a thirty-second high-voltage circuit breaker QF17, a thirty-third high-voltage circuit breaker QF26, a sixth three-phase transformer T8, an eighth single-phase transformer T10, a second medium-voltage AC bus, a second medium-low voltage DC bus, and a second power router; The second power router includes a second DC / DC converter C5, a fourth AC / DC converter C6, a fifth AC / DC converter C7, and a sixth AC / DC converter C8; The second medium-voltage AC bus is respectively connected to the other end of the fifteenth high-voltage circuit breaker QF8, and the one ends of the twenty-fifth high-voltage circuit breaker QF24, the twenty-sixth high-voltage circuit breaker QF23, the twenty-seventh high-voltage circuit breaker QF22, and the twenty-eighth high-voltage circuit breaker QF21. The other end of the twenty-fifth high-voltage circuit breaker QF24 is connected to the substation distribution load, the other end of the twenty-sixth high-voltage circuit breaker QF23 is connected to the wind-solar power generation device, the other end of the twenty-seventh high-voltage circuit breaker QF22 is connected to the new energy storage equipment, the other end of the twenty-eighth high-voltage circuit breaker QF21 is connected to the input end of the sixth three-phase transformer T8, and the output end of the sixth three-phase transformer T8 is connected to the AC end of the sixth AC / DC converter C8. The AC end of the fourth AC / DC converter C6 is connected to the output end of the third three-phase transformer T3. One DC end of the second DC / DC converter C5, the DC end of the fourth AC / DC converter C6, the DC end of the fifth AC / DC converter C7, and the DC end of the sixth AC / DC converter C8 are respectively connected to a DC bus. The other DC end of the second DC / DC converter C5 is connected to the one end of the twenty-ninth high-voltage circuit breaker QF20. The other end of the twenty-ninth high-voltage circuit breaker QF20, the one end of the thirtieth high-voltage circuit breaker QF19, the one end of the thirty-first high-voltage circuit breaker QF18, and the one end of the thirty-second high-voltage circuit breaker QF17 are respectively connected to the second medium-low voltage DC bus. The other end of the thirtieth high-voltage circuit breaker QF19 is connected to the new energy storage equipment, the other end of the thirty-first high-voltage circuit breaker QF18 is connected to the wind-solar power generation device, and the other end of the thirty-second high-voltage circuit breaker QF17 is connected to the substation distribution load. The AC end of the fifth AC / DC converter C7 is connected to the input end of the eighth single-phase transformer T10, and the output end of the eighth single-phase transformer T10 is connected to the one end of the thirty-third high-voltage circuit breaker QF26. The other end of the thirty-third high-voltage circuit breaker QF26 is connected to the medium-voltage common bus (10).

10. A multi-source fusion flexible power transformation device for an electrified railway substation according to claim 9, characterized in that, The medium-voltage common bus (10) includes a first medium-voltage common bus, a thirty-fourth high-voltage circuit breaker QF27, a second medium-voltage common bus, a thirty-fifth high-voltage circuit breaker QF28, and a thirty-sixth high-voltage circuit breaker QF29. The first medium-voltage common bus is respectively connected to the other end of the twenty-fourth high-voltage circuit breaker QF25, the other end of the ninth high-voltage circuit breaker QF-VA1, the other end of the tenth high-voltage circuit breaker QF-VB1, the one end of the thirty-third high-voltage circuit breaker QF27, and the one end of the thirty-fourth high-voltage circuit breaker QF28. The second medium-voltage common bus is respectively connected to the other end of the eleventh high-voltage circuit breaker QF-VA2, the other end of the twelfth high-voltage circuit breaker QF-VB2, the other end of the thirty-third high-voltage circuit breaker QF26, the other end of the thirty-third high-voltage circuit breaker QF27, and the one end of the thirty-fifth high-voltage circuit breaker QF29; The other end of the thirty-fourth high-voltage circuit breaker QF28 is connected to the other end of the thirty-fifth high-voltage circuit breaker QF29 to contact the train traction load catenary.

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