Electrified railway regenerative electric energy new energy auxiliary power supply system and control method

Abstract

The invention discloses an electrified railway regenerative electric energy new energy auxiliary power supply system and a control method. The system comprises a main power supply circuit and a standby power supply circuit. In the main power supply circuit, regenerative electric energy utilization and new energy power generation equipment is electrically connected with an inverter, the inverter is electrically connected with a main supply transformer, and the main supply transformer is electrically connected with the input end of an alternating current and direct current screen cabinet through a change-over switch; in the standby power supply circuit, the public power grid is electrically connected with a standby power supply transformer, and the standby power supply transformer is electrically connected with the input end of the AC / DC screen cabinet through a change-over switch; and the regenerative electric energy utilization and new energy power generation equipment and the inverter are connected with the controller. Through the unique circuit design and the rigorous control process, the problems that a traditional auxiliary power supply is high in cost, low in reliability, dependent on a public power grid and the like are effectively solved, remarkable economic benefits and social benefits are achieved, and wide application prospects are achieved in the technical field of electrified railway traction power supply.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrified railway traction power supply, and in particular to a new energy auxiliary power supply system and control method for regenerative electric energy in electrified railways. Background Art

[0002] With the rapid development of the railway system, electrified railways have become the main form of railway transportation. As the core part of railway operation, the traction power supply system of electrified railways has a very high energy consumption ratio, accounting for about 90% of the total railway electricity consumption. Facing the increasingly severe energy and environmental pressures, the railway department is actively seeking effective ways to save energy and reduce carbon emissions.

[0003] In the traction power supply system of electrified railways, the traction substation converts the three-phase alternating current of high voltage such as 110 kV in the public power grid into voltages such as 27.5 kV and sends it to the catenary for the use of train traction loads. For other railway loads, 10 kV power supply is adopted, which is divided into self-closed lines and through lines. The self-closed line is specially used to supply power to railway signal equipment. The through line supplies power to loads along the railway, railway station yard loads, and distribution substation loads, etc.

[0004] During the operation of electric locomotives in pulling trains, electric braking is often carried out, which will generate a large amount of regenerative electric energy. The traditional method is to directly feed back this part of regenerative electric energy to the public power grid, but this method will not only cause waste of electric energy, but also may have an adverse impact on the stable operation of the power grid. In order to effectively utilize this part of regenerative electric energy, in recent years, the railway department has begun to install regenerative electric energy utilization systems in traction substations and section posts (pavilions). This system can recover the regenerative electric energy generated during the braking of electric locomotives and store or reuse it, thus significantly reducing the energy consumption of the traction power supply system.

[0005] At the same time, the rapid development of new energy power generation technology has also provided new energy options for the railway traction power supply system. New energy power generation systems such as solar energy and wind energy, which are green and carbon-free, are gradually being introduced into the railway power supply system, jointly constituting a diversified energy supply system with the regenerative electric energy utilization system. The introduction of these new energy power generation systems not only helps to reduce the carbon emissions of the railway power supply system, but also improves the energy utilization efficiency of the system.

[0006] However, in practical applications, the operation of the regenerative power utilization system and the new energy power generation system still faces some challenges. On the one hand, these systems require a supporting auxiliary power supply to support their normal operation. The load power of the auxiliary power supply in some projects reaches 100 - 200 kW, and the auxiliary power supply mainly relies on the 10 kV power through line along the railway after voltage reduction for power supply, and its electricity price is relatively high, increasing the operation cost of the railway department. On the other hand, how to effectively dispatch and utilize the recycled regenerative power and new energy power generation to meet the self - power demand of traction substations and section posts (pavilions), while reducing the dependence on the public power grid, is also an urgent problem to be solved currently. Summary of the Invention

[0007] The purpose of the present invention is to provide an auxiliary power supply system and control method for regenerative power and new energy in electrified railways, so as to solve the problems of low reliability of the existing regenerative power utilization system and new energy power generation system and dependence on the public power grid.

[0008] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions: An auxiliary power supply system for regenerative power and new energy in electrified railways includes a main power supply circuit and a standby power supply circuit; In the main power supply circuit, the regenerative power utilization and new energy power generation equipment is electrically connected to an inverter, the inverter is electrically connected to a main power supply transformer, and the main power supply transformer is electrically connected to the input end of an AC - DC switch cabinet through a transfer switch; In the standby power supply circuit, the public power grid is electrically connected to a standby power supply transformer, and the standby power supply transformer is electrically connected to the input end of the AC - DC switch cabinet through a transfer switch; Both the regenerative power utilization and new energy power generation equipment and the inverter are connected to a controller.

[0009] Further, a main power supply disconnector is connected between the regenerative power utilization and new energy power generation equipment and the inverter.

[0010] Further, a standby power supply disconnector is connected between the public power grid and the standby power supply transformer.

[0011] Further, a circuit breaker is connected between the transfer switch and the input end of the AC - DC switch cabinet.

[0012] Further, an energy storage unit is arranged in the regenerative power utilization and new energy power generation equipment, and the energy storage unit is connected to the controller.

[0013] Further, the inverter is connected to the DC link of the regenerative power utilization and new energy power generation equipment.

[0014] Further, a storage battery is arranged in the AC - DC switch cabinet, and the storage battery is connected to the regenerative power utilization and new energy power generation equipment through a current conversion device in the cabinet.

[0015] Furthermore, the output terminal of the AC-DC switch cabinet is connected to the regenerative energy utilization and new energy power generation equipment and the electrical equipment within the traction substation.

[0016] A control method for the regenerative energy and new energy auxiliary power supply system of the electrified railway includes: Start the regenerative energy and new energy auxiliary power supply system of the electrified railway. The controller controls the output power of the inverter according to the required real-time power and outputs it through the main power supply circuit from the AC-DC switch cabinet; The controller monitors the operating state of the main power supply circuit in real time and determines whether the inverter is faulty. If so, close the transfer switch, switch the power supply to the standby power supply circuit, and output it through the standby power supply circuit from the AC-DC switch cabinet; If the inverter is not faulty, determine whether the main power supply transformer is faulty. If so, close the transfer switch, switch the power supply to the standby power supply circuit, and output it through the standby power supply circuit from the AC-DC switch cabinet; If the main power supply transformer is not faulty, determine whether the energy storage unit of the regenerative energy utilization and new energy power generation equipment is being charged. If so, control the output power of the inverter according to the first working condition and output it through the main power supply circuit from the AC-DC switch cabinet; If not, determine whether the SOC in the energy storage unit of the regenerative energy utilization and new energy power generation equipment is less than 0.2. If the SOC is not, control the output power of the inverter according to the second working condition and output it through the main power supply circuit from the AC-DC switch cabinet; If the SOC is, control the output power of the inverter according to the third working condition and output it through the main power supply circuit from the AC-DC switch cabinet.

[0017] Furthermore, the output power of the first working condition is:

[0018] Wherein, is the output power, is the regenerative power generation, is the photovoltaic power generation, is the charging power of the energy storage unit; The output power of the second working condition is:

[0019] Wherein, is the output power, is the discharge power of the energy storage unit, is the photovoltaic power generation, is the power consumption of the 27.5 kV catenary; The output power of the third working condition is:

[0020] Among them, is the output power, is the photovoltaic power generation, is the power taken from the 27.5 kV catenary.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a new energy auxiliary power supply system for regenerative electric energy of electrified railways. By setting up two circuits, namely the main power supply circuit and the standby power supply circuit, the main power supply circuit takes power from the intermediate DC link of the regenerative electric energy utilization and new energy power generation equipment itself, is electrically connected to an inverter, converts DC power into AC power, and then is electrically connected to a main power supply transformer. The main power supply transformer is electrically connected to an AC / DC switch cabinet through a transfer switch, and outputs common auxiliary power supplies of AC 380V and DC 110V; the standby power supply circuit takes power from the 10 kV public power grid, is electrically connected to a standby power supply transformer, and then is electrically connected to the AC / DC switch cabinet through a transfer switch, and outputs standby auxiliary power supplies of AC 380V and DC 110V. It provides auxiliary power for the system itself and supplies power to all electrical equipment in the traction substation. Compared with the traditional circuit, the circuit of the present invention mainly takes power from the intermediate DC link of the regenerative electric energy utilization and new energy power generation equipment itself, maximally utilizes the locomotive braking regenerative electric energy and new energy power generation, greatly reduces the power consumption of taking power from the 10 kV public power grid, reduces the dependence on the public power grid, and avoids paying high auxiliary power supply electricity bills, thereby realizing the minimization of the self-use electricity cost of the traction substation and the section post (booth), which helps to save energy, reduce emissions and improve economic benefits in the railway transportation industry. At the same time, the present invention adopts two redundant circuits, namely the main power supply circuit and the standby power supply circuit. When the main power supply circuit fails, it can be timely switched to the standby auxiliary power supply, greatly improving the reliability of the auxiliary power supply system and ensuring the stable operation of the regenerative electric energy utilization and new energy power generation equipment.

[0022] The present invention also provides a control method for a new energy auxiliary power supply system for regenerative electric energy of electrified railways. By starting the new energy auxiliary power supply system for regenerative electric energy of electrified railways, the controller controls the output power of the inverter according to the required real-time power, and then outputs it from the AC / DC switch cabinet in the main power supply circuit to support the long-term normal operation of the new energy auxiliary power supply system for regenerative electric energy of electrified railways and supply power to the electrical equipment in the traction substation for a long time normally. At the same time, the controller monitors the operating state of the main power supply circuit in real time, and sequentially judges the state and SOC value of the energy storage unit of the inverter, the main power supply transformer, the regenerative electric energy utilization and new energy power generation equipment, so as to decide whether to switch to the standby auxiliary power supply or control the output auxiliary power supply power of the inverter according to the corresponding working conditions, thereby ensuring the reliability of the auxiliary power supply and realizing the efficient utilization and reasonable distribution of energy.

[0023] Through unique circuit design and rigorous control processes, the present invention effectively solves problems existing in traditional auxiliary power supplies, such as high cost, low reliability, and dependence on the public power grid, and has significant economic and social benefits, with broad application prospects in the field of electrified railway traction power supply technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a diagram of the new energy auxiliary power supply system for regenerative electric energy of electrified railways of the present invention.

[0026] Figure 2 It is a diagram of the control method for the new energy auxiliary power supply system for regenerative electric energy of electrified railways of the present invention.

[0027] Wherein: 1 - regenerative electric energy utilization and new energy power generation equipment, 2 - controller, 3 - main power supply disconnector, 4 - inverter, 5 - main power supply transformer, 6 - change-over switch, 7 - circuit breaker, 8 - AC / DC switch cabinet, 9 - standby power supply disconnector, 10 - standby power supply transformer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0032] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0033] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] The following further describes the present invention in detail with reference to the drawings: See Figure 1 , the present invention provides a new energy auxiliary power supply system for regenerative electric energy of electrified railways, including a main power supply circuit and a standby power supply circuit. In the main power supply circuit, the regenerative electric energy utilization and new energy power generation device 1 is electrically connected to the input end of the main supply disconnector 3, the inverter 4, the main supply transformer 5, the changeover switch 6, the circuit breaker 7, and the AC / DC switch cabinet 8 in sequence. In the standby power supply circuit, the 10 kV of the public power grid is electrically connected to the input end of the standby supply disconnector 9, the standby supply transformer 10, the changeover switch 6, the circuit breaker 7, and the AC / DC switch cabinet 8 in sequence. Among them, both the regenerative electric energy utilization and new energy power generation device 1 and the inverter 4 are connected to the controller 2. A energy storage unit is provided in the regenerative electric energy utilization and new energy power generation device 1, and the energy storage unit is connected to the controller 2. A storage battery is provided in the AC / DC switch cabinet 8, and the storage battery is connected to the regenerative electric energy utilization and new energy power generation device 1 through the in-cabinet current conversion device. When the new energy auxiliary power supply system for regenerative electric energy of electrified railways is started, it is powered by the storage battery to provide a starting power supply for the regenerative electric energy utilization and new energy power generation device 1 and the controller 2.

[0035] The main power supply circuit takes power from the intermediate DC link of the regenerative energy utilization and new energy power generation equipment 1. First, it passes through the main power supply disconnector 3, then connects to the inverter 4 to convert DC to AC. Then, the voltage is adjusted by the main power supply transformer 5, and then it connects to the transfer switch 6, and then connects to the circuit breaker 7. Finally, it connects to the AC / DC switch cabinet 8, thereby outputting AC380V and DC110V to provide a common auxiliary power supply for the regenerative energy utilization and new energy power generation equipment 1 and the electrical equipment in the traction substation.

[0036] The standby power supply circuit takes power from the 10kV public power grid. First, it passes through the standby power supply disconnector 9, connects to the standby power supply transformer 10 for voltage conversion, then connects to the transfer switch 6, then connects to the circuit breaker 7, and finally connects to the AC / DC switch cabinet 8 to output AC380V and DC110V as the standby auxiliary power supply for the regenerative energy utilization and new energy power generation equipment 1 and the electrical equipment in the traction substation.

[0037] Compared with the traditional circuit, the present invention mainly takes power from the intermediate DC link of the regenerative energy utilization and new energy power generation equipment itself, greatly reducing the power consumption of taking power from the 10kV public power grid, avoiding paying high auxiliary power supply electricity bills, effectively reducing the self - use electricity cost, and significantly improving the efficiency of the energy - saving system. In addition, by adopting two redundant circuits, namely the main power supply circuit and the standby power supply circuit, when the main power supply fails, it can be switched to the standby power supply in time, greatly improving the reliability of the auxiliary power supply system and ensuring the stable operation of the regenerative energy utilization and new energy power generation equipment 1.

[0038] The present invention also provides a control method for the auxiliary power supply system of the regenerative energy and new energy in electrified railways, as Figure 2 shown, which specifically includes the following steps: Start the auxiliary power supply system of the regenerative energy and new energy in electrified railways. First, it is temporarily powered by stepping down the 10kV power through - line connected to the traction substation, or powered by the battery in the AC / DC switch cabinet 8 to provide a start - up power supply for the regenerative energy utilization and new energy power generation equipment 1 and the controller 2.

[0039] The controller 2 samples and monitors the real - time power required by the auxiliary power supply in real time, and establishes real - time communication with the regenerative energy utilization and new energy power generation equipment 1. The controller 2 controls the real - time power output by the inverter 4 in real time, enables the flow of electric energy, and outputs through the main power supply circuit from the AC / DC switch cabinet 8, and the auxiliary power supply supplies power normally to support the long - term normal operation of the auxiliary power supply system of the regenerative energy and new energy in electrified railways and supply power to the electrical equipment in the traction substation for a long time. At the same time, the controller 2 monitors the operating status of each key component in the main power supply circuit in real time.

[0040] Determine whether the inverter 4 is faulty. If so, close the transfer switch 6 to switch the power supply to the backup power supply circuit, and output through the backup power supply circuit by the AC-DC panel cabinet 8 to ensure the continuous supply of the auxiliary power supply.

[0041] If the inverter 4 is not faulty, determine whether the main supply transformer 5 is faulty. If so, close the transfer switch 6 to switch the power supply to the backup power supply circuit, and output through the backup power supply circuit by the AC-DC panel cabinet 8 to prevent the interruption of the auxiliary power supply due to the failure of the main supply transformer.

[0042] If the main supply transformer 5 is not faulty, determine whether the energy storage unit of the regenerative energy utilization and new energy power generation equipment 1 is charged. If so, control the output power of the inverter 4 according to the first working condition, and output through the main power supply circuit by the AC-DC panel cabinet 8 to achieve precise regulation of the output power of the auxiliary power supply and meet the power consumption requirements of the regenerative energy utilization and new energy power generation equipment 1. The output power of the first working condition is:

[0043] Among them, is the output power, is the regenerative power generation, is the photovoltaic power generation, is the charging power of the energy storage unit. In this case, can be 0, indicating the working condition where the photovoltaic cells do not generate electricity.

[0044] If not, determine whether the SOC in the energy storage unit of the regenerative energy utilization and new energy power generation equipment 1 is less than 0.2. If the SOC is not, control the output power of the inverter 4 according to the second working condition, and output through the main power supply circuit by the AC-DC panel cabinet 8, and reasonably adjust the output power according to the remaining power of the energy storage unit to ensure the stable output of the auxiliary power supply. The output power of the second working condition is:

[0045] Among them, is the output power, is the discharge power of the energy storage unit, is the photovoltaic power generation, is the power consumption of the 27.5kV catenary. In this case, can be 0, indicating the working condition where the photovoltaic cells do not generate electricity.

[0046] If the SOC is less than 0.2, it means that the power of the energy storage unit is too low. At this time, it is necessary to protect the energy storage unit and not allow the energy storage unit to discharge. Then control the output power of the inverter 4 according to the third working condition, and output through the main power supply circuit by the AC-DC panel cabinet 8. The output power of the third working condition is:

[0047] Among them, is the output power, is the photovoltaic power generation, is the power taken from the 27.5 kV catenary. In this case, can be 0, indicating the condition where the photovoltaic cells are not generating electricity.

[0048] The present invention monitors the real-time power required by the entire auxiliary power supply in real time through the controller 2, and establishes real-time communication with the regenerative energy utilization and new energy power generation device 1. Then, the controller 2 controls the inverter 4 to output the required real-time power in real time, enabling the flow of electric energy. The main power supply circuit takes power from the intermediate DC link of the regenerative energy utilization and new energy power generation device 1, passes through the main power supply disconnector 3, the inverter 4, and then through the main power supply transformer 5 for voltage conversion, provides input to the AC-DC switch cabinet 8, and finally the AC-DC switch cabinet 8 outputs the AC380V and DC110V auxiliary power supplies. At this time, it is normal power supply to support the long-term normal operation of the regenerative energy new energy auxiliary power supply system for electrified railways and to supply power to the electrical equipment in the traction substation for a long time. At the same time, the controller 2 monitors the operating status of each key component in the main power supply circuit in real time.

[0049] When a fault occurs in the inverter 4, the controller 2 quickly detects the fault signal and immediately closes the transfer switch 6 in accordance with the process in the control method to switch the power supply to the standby power supply circuit. The standby power supply circuit takes power from the 10 kV public grid, and after conversion by devices such as the standby power supply disconnector 9 and the standby power supply transformer 10, provides input to the AC-DC switch cabinet 8, and the AC-DC switch cabinet 8 outputs stable AC380V and DC110V auxiliary power supplies to ensure that the regenerative energy new energy auxiliary power supply system for electrified railways does not stop working due to a fault in the main power supply circuit.

[0050] In various other cases, such as when judging whether the main power supply transformer 5 is faulty and the state of the energy storage unit of the regenerative energy utilization and new energy power generation device 1, the controller 2 also makes accurate judgments and operations according to the steps in the above control method. By monitoring the SOC value of the energy storage unit and flexibly selecting the operating condition of controlling the output auxiliary power supply power according to the remaining power, the controller 2 controls the inverter 4 to output the auxiliary power supply power required by the corresponding system load in real time, thereby realizing the efficient utilization and reasonable distribution of energy while ensuring the reliability of the auxiliary power supply.

[0051] The present invention effectively solves the problems of high cost, low reliability, and dependence on the public grid existing in traditional auxiliary power supplies through a unique circuit design and a rigorous control process, is more economical, reliable, and environmentally friendly, has significant economic and social benefits, and has broad application prospects in the field of electrified railway traction power supply technology.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An auxiliary power supply system for regenerative electric energy of electrified railways, characterized in that, It includes a main power supply circuit and a backup power supply circuit; In the main power supply circuit, a regenerative energy utilization and new energy power generation device (1) is electrically connected to an inverter (4), the inverter (4) is electrically connected to a main power supply transformer (5), and the main power supply transformer (5) is electrically connected to the input end of an AC-DC switch cabinet (8) through a changeover switch (6); In the backup power supply circuit, the public power grid is electrically connected to a backup power supply transformer (10), and the backup power supply transformer (10) is electrically connected to the input end of the AC-DC switch cabinet (8) through a changeover switch (6); Both the regenerative energy utilization and new energy power generation device (1) and the inverter (4) are connected to a controller (2).

2. The new energy auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, wherein A main power supply disconnecting switch (3) is connected between the regenerative energy utilization and new energy power generation device (1) and the inverter (4).

3. An auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, characterized in that A backup power supply disconnecting switch (9) is connected between the public power grid and the backup power supply transformer (10).

4. An auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, characterized in that, A circuit breaker (7) is connected between the changeover switch (6) and the input end of the AC-DC switch cabinet (8).

5. An auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, characterized in that, An energy storage unit is arranged in the regenerative energy utilization and new energy power generation device (1), and the energy storage unit is connected to the controller (2).

6. The new energy auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, characterized in that, The inverter (4) is connected to the DC link of the regenerative energy utilization and new energy power generation device (1).

7. An auxiliary power supply system for regenerative electric energy of electrified railways according to claim 1, characterized in that, A storage battery is arranged in the AC-DC switch cabinet (8), and the storage battery is connected to the regenerative energy utilization and new energy power generation device (1) through a converter device in the cabinet.

8. An auxiliary power supply system for new energy of regenerative electric energy in electrified railways according to claim 1, characterized in that, The output end of the AC-DC switch cabinet (8) is connected to the regenerative energy utilization and new energy power generation device (1) and the electrical equipment in the traction substation.

9. A control method for the new energy auxiliary power supply system of the regenerative electric energy of an electrified railway according to any one of claims 1 to 8, characterized in that, It includes: Start the regenerative energy and new energy auxiliary power supply system for electrified railways. The controller (2) controls the output power of the inverter (4) according to the required real-time power and outputs it from the AC-DC switch cabinet (8) through the main power supply circuit; The controller (2) monitors the operating state of the main power supply circuit in real time and judges whether the inverter (4) is faulty. If so, close the changeover switch (6) to switch the power supply to the backup power supply circuit and output it from the AC-DC switch cabinet (8) through the backup power supply circuit; If the inverter (4) is not faulty, judge whether the main power supply transformer (5) is faulty. If so, close the changeover switch (6) to switch the power supply to the backup power supply circuit and output it from the AC-DC switch cabinet (8) through the backup power supply circuit; If the main power supply transformer (5) is not faulty, judge whether the energy storage unit of the regenerative energy utilization and new energy power generation device (1) is charged. If so, control the output power of the inverter (4) according to the first working condition and output it from the AC-DC switch cabinet (8) through the main power supply circuit; If not, judge whether the SOC in the energy storage unit of the regenerative energy utilization and new energy power generation device (1) is less than 0.

2. If the SOC is not, control the output power of the inverter (4) according to the second working condition and output it from the AC-DC switch cabinet (8) through the main power supply circuit; If the SOC is, control the output power of the inverter (4) according to the third working condition and output it from the AC-DC switch cabinet (8) through the main power supply circuit.

10. The control method of the new energy auxiliary power supply system for the regenerative electric energy of electrified railways according to claim 9, characterized in that, The output power of the first working condition is: Among them, is the output power, is the regenerative power generation, is the photovoltaic power generation, is the charging power of the energy storage unit; The output power of the second working condition is: Among them, is the output power, is the discharge power of the energy storage unit, is the photovoltaic power generation, is the power consumption of the 27.5 kV catenary; The output power of the third working condition is: Among them, is the output power, is the photovoltaic power generation, is the power taken from the 27.5 kV catenary.

Images