Electrified railway energy router system and control method therefor

Abstract

The present invention relates to the technical field of electrified railway traction power supply. Disclosed are an electrified railway energy router system and a control method therefor. A back-to-back inverter BTB consists of an inverter BTBα on an α-phase circuit side and an inverter BTBβ on a β-phase circuit side, and direct current sides of a cross-phase inverter IBI, the inverter BTBα and the inverter BTBβ are all connected to a direct current bus DCB to form a star structure. A controller CC monitors and analyzes traction load operation parameters by means of a bidirectional signal port and controls renewable energy output power in a direct current source DS, charging and discharging of an energy storage device, and working states of the cross-phase inverter IBI and the back-to-back inverter BTB. The problems of high cost and difficulty in engineering applications of traditional back-to-back structured railway energy routers are solved.

Description

An electrified railway energy router system and control method thereof Technical Field

[0001] The present invention belongs to the technical field of electrified railway traction power supply, and in particular relates to an electrified railway energy router system and a control method thereof. Background Art

[0002] my country has made remarkable progress in rail electrification, with over 146,000 kilometers of electrified railway mileage. This translates into significant carbon emissions and electricity demand. Optimizing the energy structure of electrified railways is crucial for achieving carbon neutrality. Therefore, integrating green renewable energy with electrified railways and technologies such as energy storage to recover regenerative braking energy from trains are becoming key trends in electrified railway technology development.

[0003] The existing electrified railway traction power supply system uses a railway energy router (RER) to integrate new energy access, recover train regenerative braking energy, and improve the reactive power and negative sequence problems of the traction power supply system. As a multi-port energy hub, the RER does not need to change the structure of the existing traction power supply system. The traditional RER adopts a back-to-back structure. The AC measurement of two sets of converters is connected to the α and β phases of the traction bus power supply arm respectively through two sets of step-down transformers. Its four-quadrant working mode can realize flexible power flow between the two phases of the traction bus, the new energy power supply and the energy storage system. However, the traditional back-to-back structure RER contains two sets of converters and transformers, which have strict requirements on the tolerance level of power electronic devices and high transformer capacity occupation fee, resulting in high actual engineering costs and difficulties in promotion and application.

[0004] The invention patent "A power integration device for electrified railway traction power supply substations (application number: 2022101262947)" proposes a power integration device for substations. It adds a set of transformers and AC / DC converters to the traditional substation power integration device, reducing the equipment capacity and cost. However, this patent is only applicable to substations where the voltages of the adjacent power supply arms are in the same phase, and does not meet the conditions for universal promotion.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide an electrified railway energy router system and its control method, which can effectively solve the technical problem of integrating renewable energy such as photovoltaic and wind power and energy storage systems into the traction power supply system (including traction substations and substations).

[0007] To achieve the above-mentioned object, the technical solution of the present invention is: an electrified railway energy router system, comprising an α-phase circuit and a β-phase circuit arranged on two power supply arms of a traction substation or a substation, an inter-phase inverter IBI, a back-to-back inverter BTB, a DC source DS, and a controller CC, wherein the back-to-back inverter BTB is composed of an inverter BTB on one side of the α-phase circuit. α and the inverter BTB on the β-phase circuit side β Composition, inter-phase inverter IBI, inverter BTB α and inverter BTB β The DC side of the inverter is connected to the DC bus DCB of the parallel DC source DS and the capacitor DFC to form a star structure; the AC side of the inter-phase inverter IBI is connected across the α1 of the α phase circuit and the β1 of the β phase circuit respectively; the inverter BTB α One end of the AC side is connected to α2 of the α phase circuit, and the other end is connected to the rail X α Grounded at the inverter BTB β One end of the AC side is connected to β2 of the β phase circuit, and the other end is connected to the rail X β The bidirectional signal ports of the controller CC are connected to the inter-phase inverter IBI and inverter BTB respectively. α , inverter BTB β , the signal end of the DC source DS is connected, and the unidirectional signal port in1 and port in2 of the controller CC are respectively connected to the traction load information output ends of the α-phase circuit and the β-phase circuit. The controller CC realizes reasonable distribution of active power and power quality compensation by monitoring and analyzing the operating parameters of the traction load and controlling the renewable energy output and charging and discharging of the energy storage device in the DC source DS, as well as the working status of the inter-phase inverter IBI and the back-to-back inverter BTB.

[0008] The cross-phase inverter IBI has two structures: parallel and cascade. The parallel structure of the cross-phase inverter IBI is to connect the cross-phase inverters IBI1, IBI2, ..., IBI n The AC side is connected to the isolation transformer MT IBI The corresponding n secondary windings, isolation transformer MT IBI One end of the primary winding is connected to the α phase circuit at α1, and the other end is connected to the β phase circuit at β1; the cascade structure of the cross-phase inverter IBI is to connect the cross-phase inverters IBI1, IBI2, ..., IBI n The AC sides of the circuits are cascaded in sequence and connected across α1 of the α phase circuit and β1 of the β phase circuit respectively; wherein n is a positive integer.

[0009] The inverter BTB α and inverter BTB β There are two structures: parallel and cascade; the inverter BTB αThe parallel structure is to connect the inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the isolation transformer MT on the α phase circuit side. α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The inverter BTB α The cascade structure is to connect the inverter BTB α1 、BTB α2 ,...,BTB αn The AC side of the α phase circuit is connected in cascade and connected to α2 of the α phase circuit and the rail X α The inverter BTB β The parallel structure is to connect the inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is connected to the isolation transformer MT on the β phase circuit side. β The corresponding n secondary windings, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the β phase circuit at β2. β The inverter BTB β The cascade structure is to connect the inverter BTB β1 、BTB β2 ,...,BTB βn The AC side of the β phase circuit is connected in cascade and connected to β2 of the β phase circuit and the rail X β Place.

[0010] The DC bus DCB has two structures: single bus and multi-bus. The single bus structure of the DC bus DCB is a DC bus DCB with only one parallel DC source DS and capacitor DFC, and an inverter BTB. α1 、BTB α2 ,...,BTB αn 、BTB β1 、BTB β2 ,...,BTB βn and inter-phase inverters IBI1, IBI2, ..., IBI n The DC side of the DC bus is connected to the DC bus DCB at the same time; the multi-bus structure of the DC bus DCB is that there are n DC buses DCB1, DCB2, ..., DCBn, and the inverter BTB α1 , inverter BTB β1The DC side of the inter-phase inverter IBI1 is connected to the DC bus DCB1 of the parallel DC source DS1 and the capacitor DFC1, and the inverter BTB α2 , inverter BTB β2 The DC side of the inter-phase inverter IBI2 is connected to the DC bus DCB2 of the parallel DC source DS2 and the capacitor DFC2, ..., the inverter BTB αn , inverter BTB βn and inter-phase inverter IBI n The DC side of the DS is connected to the parallel DC source DS n and capacitor DFC n DC bus DCB n .

[0011] The DC source DS includes but is not limited to energy storage devices, photovoltaic, fuel cells and other new energy sources and other power sources converted into DC output through conversion.

[0012] Furthermore, a control method for an electrified railway energy router system is provided, wherein the controller CC includes an energy management layer and a device control layer, wherein the energy management layer has the function of coordinating the real-time power interaction between the α-phase circuit and the β-phase circuit, the inter-phase inverter IBI, the inverter BTB α , inverter BTB β The real-time power interaction between each other and between the α-phase circuit, β-phase circuit and DC source DS, and the real-time power interaction between renewable energy and energy storage devices within the DC source DS; the energy management layer has the function of detecting the real-time operating status of each inverter, judging whether it is faulty, and promptly removing the faulty equipment; the energy management layer has the function of monitoring the real-time voltage, current, power of the traction load of the α-phase circuit and the β-phase circuit, the real-time power of renewable energy in the DC source DS, and the real-time operating status of the energy storage device in the DC source DS, and carries out energy management based on the goals of renewable energy consumption, regenerative braking energy recovery and power quality compensation, and determines the current operating mode of the electrified railway energy router system and the cross-phase inverter IBI and inverter BTB. α , inverter BTB β Transfer the reference values ​​of active power and reactive power, calculate the reference values ​​of renewable energy output and energy storage device charging and discharging power in DC source DS, and then send the results to the device control layer; the device control layer adopts the control strategy to control the cross-phase inverter IBI and inverter BTB α , inverter BTB β , renewable energy, and the operating status of energy storage devices, where control strategies include but are not limited to voltage / current / power closed-loop control and model predictive control.

[0013] The controller CC controls the active power transferred to the α-phase circuit and the β-phase circuit by the electrified railway energy router system, preferably:

[0014] Where, P α 、P β They represent the target active power values ​​transferred to the α-phase circuit and the β-phase circuit, P Lα 、P Lβ They represent the active power of the α-phase circuit and the β-phase circuit pulling the load, P PV Represents the output power of renewable energy in DC source DS, P ESS represents the output power of the energy storage device in the DC source DS;

[0015] Based on the theory of electrified railway traction power supply systems, there is a 60° phase difference between the α-phase circuit and the β-phase circuit. The inter-phase inverter IBI connected across the two phases can inject active power into the α-phase circuit and the β-phase circuit as follows:

[0016] Where, P IBIα 、P IBIβ They represent the active power injected into the α-phase circuit and the β-phase circuit by the inter-phase inverter IBI, V mα 、V mβ Represent the effective values ​​of the voltage of the α-phase circuit and the β-phase circuit, I IBI Indicates the effective value of the current of the cross-phase inverter IBI, The phase difference between the current of the inter-phase inverter IBI and the voltage of the α-phase circuit is represented by:

[0017] Where Q IBIα , Q IBIβ They represent the reactive power injected into the α-phase circuit and the β-phase circuit by the inter-phase inverter IBI respectively;

[0018] In addition, cross-phase inverter IBI, inverter BTB α and inverter BTB β The relationship between the transferred active power is:

[0019] Where, P BTBα 、P BTBβ Represents inverter BTB α and inverter BTB β Active power injected into the α-phase circuit and the β-phase circuit;

[0020] Inter-phase inverter IBI, inverter BTB α and inverter BTB β The relationship between the reactive power is:

[0021] Where Q BTBα , Q BTBβ Represents inverter BTB α and inverter BTB β Reactive power injected into the α-phase circuit and the β-phase circuit; Q Tα and Q Tβ They represent the reactive power injected by the traction transformer into the α-phase circuit and the β-phase circuit respectively; Q Lα and Q Lβ represents the reactive power generated by the traction load of the α-phase circuit and the β-phase circuit respectively.

[0022] The beneficial effects of adopting this technical solution are:

[0023] (1) The present invention proposes a star-shaped structure of an electrified railway energy router system composed of a hybrid topology of cross-phase inverters and back-to-back inverters, which can realize all the functions of active power integration, negative sequence suppression, reactive power compensation and recycling of regenerative braking energy in a traction power supply system (including traction depots and sub-stations) containing renewable energy and energy storage devices based on traditional back-to-back inverter railway energy routers;

[0024] (2) The present invention proposes a star-shaped structure for an electrified railway energy router system, which fully takes into account the advantages of the small hardware capacity of the cross-phase inverter railway energy router and the flexible and controllable advantages of the back-to-back inverter railway energy router. It also overcomes the shortcomings of the cross-phase inverter railway energy router, which requires an additional reactive power compensation device, and the large hardware capacity of the back-to-back inverter railway energy router. It solves the problems of large hardware capacity, high cost, and difficulty in engineering application in the existing railway energy router system.

[0025] (3) The present invention has a simple structure and is easy to control. It can effectively access and absorb renewable energy along the railway line; effectively recycle and utilize the regenerative braking energy of the train; effectively control the power quality problems such as reactive power and negative sequence current in the traction power supply system; and its modular design effectively reduces the hardware capacity of the equipment, improves the capacity utilization rate and system fault tolerance, and reduces the equipment capacity occupation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a star structure topology diagram of the present invention;

[0027] FIG2 is a block diagram of a system structure of a first embodiment of the present invention;

[0028] FIG3 is a block diagram of a system structure of a second embodiment of the present invention;

[0029] FIG4 is a block diagram of a system structure of a third embodiment of the present invention;

[0030] FIG5 is a block diagram of a system structure of a fourth embodiment of the present invention;

[0031] FIG6 is a block diagram of a system structure of a fifth embodiment of the present invention;

[0032] FIG7 is a block diagram of a system structure of a sixth embodiment of the present invention; DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings of specific embodiments. Obviously, the embodiments described below are some embodiments of the present invention, but not all embodiments. In addition to the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on the principles of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0034] The working principle of the present invention is: the back-to-back inverter railway energy router BTB consists of two sets of single-phase four-quadrant inverters BTB α 、BTB β The back-to-back structure forms a dynamic power distribution between the two phases of the traction power supply system and between the DC source DS and the two phases of the traction power supply system, and has the comprehensive power quality compensation capability. The AC side of the inter-phase inverter railway energy router IBI, which shares the DC bus with the back-to-back inverter railway energy router BTB, is connected across the α-phase circuit and the β-phase circuit, providing another power exchange channel between the two phases of the traction power supply system and between the DC source DS and the two phases of the traction power supply system.

[0035] As shown in FIG1 , a star-shaped topology diagram of an electrified railway energy router system of the present invention is shown, wherein the railway energy router system includes an α-phase circuit and a β-phase circuit, an inter-phase inverter IBI, a back-to-back inverter BTB, a DC source DS, and a controller CC, which are arranged on two power supply arms of a traction substation or a substation. The back-to-back inverter BTB is composed of an inverter BTB on the α-phase circuit side. α and the inverter BTB on the β-phase circuit side β Composition, and cross-phase inverter IBI, inverter BTB on the α phase circuit side α and the inverter BTB on the β-phase circuit side β The DC side of the inverter is connected to the DC bus DCB of the parallel capacitor DFC to form a star structure. At the same time, the DC bus DCB is connected to the DC source DS. The AC side of the inter-phase inverter IBI is connected across the α1 of the α phase circuit and the β1 of the β phase circuit of the traction power supply system. The inverter BTB α One end of the AC side is connected to the α2 of the α phase circuit, and the other end is connected to the rail X α Grounded; Inverter BTB β One end of the AC side is connected to β2 of the β phase circuit, and the other end is connected to the rail X βThe bidirectional signal ports of the controller CC are connected to the cross-phase inverter IBI and the α-phase circuit side inverter BTB respectively. α , β-phase circuit side inverter BTB β , the signal end of the DC source DS is connected, and the unidirectional signal port in1 and port in2 of the controller CC are respectively connected to the traction load information output ends of the α-phase circuit and the β-phase circuit of the traction power supply system. The controller CC monitors and analyzes the operating parameters of the traction load and controls the renewable energy output and energy storage device charging and discharging in the DC source DS, as well as the working states of the inter-phase inverter IBI and the back-to-back inverter BTB, to achieve reasonable active power distribution and power quality compensation.

[0036] Furthermore, the present invention also proposes a control method for an electrified railway energy router system: the controller CC performs energy management based on the goals of renewable energy consumption, regenerative braking energy recovery and power quality compensation, and obtains the renewable energy output P in the DC source DS. PV , energy storage device charging and discharging power P ESS , the active power P transferred to the α-phase circuit by the star-structure railway energy router system α , the active power P transferred to the β-phase circuit by the star-structure railway energy router system β , the reactive power Q transferred to the α phase circuit by the star-structure railway energy router system α , the reactive power Q transferred to the β-phase circuit by the star-structure railway energy router system β , and satisfy the following equation:

[0037] Where, P IBIα 、P IBIβ They represent the active power injected into the α-phase circuit and the β-phase circuit by the inter-phase inverter IBI, Q IBIα , Q IBIβ They represent the reactive power injected into the α-phase circuit and the β-phase circuit by the inter-phase inverter IBI, P BTBα 、P BTBβ They represent the inverter BTB on the α-phase circuit side α Injection α-phase circuit and β-phase circuit side inverter BTB β Active power injected into the β phase circuit, Q BTBα , Q BTBβ They represent the inverter BTB on the α-phase circuit side α Injection α-phase circuit and β-phase circuit side inverter BTB β The reactive power injected into the β phase circuit; at the same time, preferably, satisfying:

[0038] Where, P Lα 、P LβThey represent the active power of the α-phase circuit and the β-phase circuit traction load respectively;

[0039] Preferably, based on the theory of electrified railway traction power supply systems, there is a 60° phase difference between the α-phase circuit and the β-phase circuit, resulting in the inter-phase inverter IBI connected across the two phases being able to inject active power into the α-phase circuit and the β-phase circuit as follows:

[0040] Where, I IBI Indicates the effective value of the current of the cross-phase inverter IBI, The phase difference between the current of the inter-phase inverter IBI and the voltage of the α-phase circuit is represented by:

[0041] Preferably, the α-phase circuit side inverter BTB is required α and β-phase circuit side inverter BTB β The compensated reactive power is:

[0042] Where Q Tα and Q Tβ They represent the reactive power injected by the traction transformer into the α-phase circuit and the β-phase circuit respectively; Q Lα and Q Lβ The reactive power generated by the traction load of the α-phase circuit and the β-phase circuit is represented by the controller CC. Then, the controller CC determines P IBIα 、P IBIβ , Q IBIα , Q IBIβ 、P BTBα 、P BTBβ , Q BTBα , Q BTBβ , to realize the operation control of the star-structured railway energy router system.

[0043] As shown in FIG2 , the present invention specifically provides a technical implementation scheme of a first system structure, wherein the cross-phase inverter IBI adopts a parallel structure, and the cross-phase inverters IBI1, IBI2, ..., IBI n The AC side is connected to the isolation transformer MT IBI The corresponding n secondary windings, isolation transformer MT IBI One end of the primary winding is connected to the α phase circuit at α1, and the other end is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the α phase circuit side isolation transformer MTα The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The β phase circuit side inverter BTB β Use parallel structure to connect the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is connected to the β side isolation transformer MT β The corresponding n secondary windings, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the primary winding at the rail X β At the same time, the cross-phase inverters IBI1, IBI2, ..., IBI n , α-phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn , β-phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn , whose DC sides are connected to the DC bus DCB of the parallel DC source DS and the capacitor DFC. Wherein, n is a positive integer.

[0044] As shown in FIG3 , the present invention specifically provides a technical implementation scheme of a second system structure, wherein the cross-phase inverter IBI adopts a cascade structure, connecting the cross-phase inverters IBI1, IBI2, ..., IBI n The AC sides of the cross-phase inverters IBI1 are connected in cascade in sequence, that is, one end of the AC side of the cross-phase inverter IBI1 is connected to the α-phase circuit at α1, the other end of the AC side of the cross-phase inverter IBI1 is connected to one end of the AC side of the cross-phase inverter IBI2, the other end of the AC side of the cross-phase inverter IBI2 is connected to one end of the AC side of the cross-phase inverter IBI3, ..., the cross-phase inverter IBI n-1 The other end of the AC side is connected to the inter-phase inverter IBI n One end of the AC side is connected to the cross-phase inverter IBI n The other end of the AC side is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the α phase circuit side isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail Xα The β phase circuit side inverter BTB β Use parallel structure to connect the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is connected to the β side isolation transformer MT β Corresponding secondary winding, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the primary winding at the rail X β At the same time, the cross-phase inverters IBI1, IBI2, ..., IBI n , α-phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn , β-phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn , and their DC sides are connected to a DC bus DCB with a DC source DS and a capacitor DFC in parallel.

[0045] As shown in FIG4 , the present invention specifically provides a technical implementation scheme of a third system structure, wherein the cross-phase inverter IBI adopts a parallel structure, and the cross-phase inverters IBI1, IBI2, ..., IBI n The AC side is connected to the isolation transformer MT IBI The corresponding n secondary windings, isolation transformer MT IBI One end of the primary winding is connected to the α phase circuit at α1, and the other end is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the α phase circuit side isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The β phase circuit side inverter BTB β Use parallel structure to connect the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is connected to the β side isolation transformer MT β The corresponding n secondary windings, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the primary winding at the rail Xβ At the same time, the cross-phase inverter IBI1 and the α-phase circuit side inverter BTB α1 , β-phase circuit side inverter BTB β1 The DC side of the inverter is connected to the DC bus DCB1 with the DC source DS1 and the capacitor DFC1 in parallel, the inter-phase inverter IBI2, the α-phase circuit side inverter BTB α2 , β-phase circuit side inverter BTB β2 The DC side of the inverter is connected to the DC bus DCB2 with the DC source DS2 and the capacitor DFC2 in parallel, ..., the inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the DS is connected in parallel with the DC source DS n and capacitor DFC n DC bus DCB n .

[0046] As shown in FIG5 , the present invention specifically provides a technical implementation scheme of a fourth system structure, wherein the cross-phase inverter IBI adopts a cascade structure, connecting the cross-phase inverters IBI1, IBI2, ..., IBI n The AC sides of the cross-phase inverters IBI1 are connected in cascade in sequence, that is, one end of the AC side of the cross-phase inverter IBI1 is connected to the α-phase circuit at α1, the other end of the AC side of the cross-phase inverter IBI1 is connected to one end of the AC side of the cross-phase inverter IBI2, the other end of the AC side of the cross-phase inverter IBI2 is connected to one end of the AC side of the cross-phase inverter IBI3, ..., the cross-phase inverter IBI n-1 The other end of the AC side is connected to the inter-phase inverter IBI n One end of the AC side is connected to the cross-phase inverter IBI n The other end of the AC side is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the α phase circuit side isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The β phase circuit side inverter BTB β Use parallel structure to connect the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is connected to the β side isolation transformer MTβ The corresponding n secondary windings, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the primary winding at the rail X β At the same time, the cross-phase inverter IBI1 and the α-phase circuit side inverter BTB α1 , β-phase circuit side inverter BTB β1 The DC side of the inverter is connected to the DC bus DCB1 with the DC source DS1 and the capacitor DFC1 in parallel, the inter-phase inverter IBI2, the α-phase circuit side inverter BTB α2 , β-phase circuit side inverter BTB β2 The DC side of the inverter is connected to the DC bus DCB2 with the DC source DS2 and the capacitor DFC2 in parallel, ..., the inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the DS is connected in parallel with the DC source DS n and capacitor DFC n DC bus DCB n .

[0047] As shown in FIG6 , the present invention specifically provides a technical implementation scheme of a fifth system structure, wherein the cross-phase inverter IBI adopts a parallel structure, and the cross-phase inverters IBI1, IBI2, ..., IBI n The AC side is connected to the isolation transformer MT IBI The corresponding n secondary windings, isolation transformer MT IBI One end of the primary winding is connected to the α phase circuit at α1, and the other end is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αn The AC side is connected to the α phase circuit side isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The β phase circuit side inverter BTB β Adopting cascade structure, the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is cascaded in sequence, that is, the β phase circuit side inverter BTB β1 One end of the AC side is connected to the β phase circuit at β2, and the β phase circuit side inverter BTB β1The other end of the AC side is connected to the β phase circuit side inverter BTB β2 One end of the AC side is connected to the inverter BTB on the β phase circuit side β2 The other end of the AC side is connected to the β phase circuit side inverter BTB β3 One end of the AC side is connected to ..., the β-phase circuit side inverter BTB βn-1 The other end of the AC side is connected to the β phase circuit side inverter BTB βn One end of the AC side is connected to the inverter BTB on the β phase circuit side βn The other end of the AC side is connected to the rail X β At the same time, the cross-phase inverter IBI1 and the α-phase circuit side inverter BTB α1 , β-phase circuit side inverter BTB β1 The DC side of the inverter is connected to the DC bus DCB1 with the DC source DS1 and the capacitor DFC1 in parallel, the inter-phase inverter IBI2, the α-phase circuit side inverter BTB α2 , β-phase circuit side inverter BTB β2 The DC side of the inverter is connected to the DC bus DCB2 with the DC source DS2 and the capacitor DFC2 in parallel, ..., the inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the DS is connected in parallel with the DC source DS n and capacitor DFC n DC bus DCB n .

[0048] As shown in FIG7 , the present invention specifically provides a technical implementation scheme of a sixth system structure, wherein the cross-phase inverter IBI adopts a cascade structure, connecting the cross-phase inverters IBI1, IBI2, ..., IBI n The AC sides of the cross-phase inverters IBI1 are connected in cascade in sequence, that is, one end of the AC side of the cross-phase inverter IBI1 is connected to the α-phase circuit at α1, the other end of the AC side of the cross-phase inverter IBI1 is connected to one end of the AC side of the cross-phase inverter IBI2, the other end of the AC side of the cross-phase inverter IBI2 is connected to one end of the AC side of the cross-phase inverter IBI3, ..., the cross-phase inverter IBI n-1 The other end of the AC side is connected to the inter-phase inverter IBI n One end of the AC side is connected to the cross-phase inverter IBI n The other end of the AC side is connected to the β phase circuit at β1; the α phase circuit side inverter BTB α Use parallel structure to connect the α phase circuit side inverter BTB α1 、BTB α2 ,...,BTB αnThe AC side is connected to the α phase circuit side isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The β phase circuit side inverter BTB β Adopting cascade structure, the β phase circuit side inverter BTB β1 、BTB β2 ,...,BTB βn The AC side is cascaded in sequence, that is, the β phase circuit side inverter BTB β1 One end of the AC side is connected to the β phase circuit at β2, and the β phase circuit side inverter BTB β1 The other end of the AC side is connected to the β phase circuit side inverter BTB β2 One end of the AC side is connected to the inverter BTB on the β phase circuit side β2 The other end of the AC side is connected to the β phase circuit side inverter BTB β3 One end of the AC side is connected to ..., the β-phase circuit side inverter BTB βn-1 The other end of the AC side is connected to the β phase circuit side inverter BTB βn One end of the AC side is connected to the inverter BTB on the β phase circuit side βn The other end of the AC side is connected to the rail X β At the same time, the cross-phase inverter IBI1 and the α-phase circuit side inverter BTB α1 , β-phase circuit side inverter BTB β1 The DC side of the inverter is connected to the DC bus DCB1 with the DC source DS1 and the capacitor DFC1 in parallel, the inter-phase inverter IBI2, the α-phase circuit side inverter BTB α2 , β-phase circuit side inverter BTB β2 The DC side of the inverter is connected to the DC bus DCB2 with the DC source DS2 and the capacitor DFC2 in parallel, ..., the inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the DS is connected in parallel with the DC source DS n and capacitor DFC n DC bus DCB n .

[0049] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrified railway energy router system, comprising an α-phase circuit and a β-phase circuit arranged on two power supply arms of a traction substation or a section post, an interphase inverter IBI, a back-to-back inverter BTB, a DC source DS, and a controller CC, characterized in that: The back-to-back inverter BTB consists of the inverter BTB on one side of the α-phase circuit α and the inverter BTB on one side of the β-phase circuit β The DC sides of the trans-phase inverter IBI, the inverter BTB α and the inverter BTB β are all connected to the DC bus DCB of the parallel DC source DS and the capacitor DFC to form a star structure; the AC sides of the trans-phase inverter IBI are respectively connected across α1 of the α-phase circuit and β1 of the β-phase circuit; one end of the AC side of the inverter BTB α is connected to α2 of the α-phase circuit, and the other end is grounded through the rail X α ; one end of the AC side of the inverter BTB β is connected to β2 of the β-phase circuit, and the other end is grounded through the rail X β ; the bidirectional signal ports of the controller CC are respectively connected to the trans-phase inverter IBI, the inverter BTB α , the inverter BTB β , and the signal terminals of the DC source DS. The unidirectional signal ports in1 and in2 of the controller CC are respectively connected to the traction load information output terminals of the α-phase circuit and the β-phase circuit. The controller CC realizes the reasonable distribution of active power and the compensation of power quality by monitoring and analyzing the operation parameters of the traction load and controlling the output of renewable energy in the DC source DS, the charge and discharge of the energy storage device, and the working states of the trans-phase inverter IBI and the back-to-back inverter BTB.

2. The electrified railway energy router system according to claim 1, characterized in that: The cross-phase inverter IBI has two structures: parallel and cascaded. The parallel structure of the cross-phase inverter IBI is to connect the AC sides of the cross-phase inverters IBI1, IBI2,..., IBI n to the corresponding n secondary windings of the isolation transformer MT IBI respectively. One end of the primary winding of the isolation transformer MT IBI is connected to the α-phase circuit at α1, and the other end is connected to the β-phase circuit at β1. The cascaded structure of the cross-phase inverter IBI is to cascade the AC sides of the cross-phase inverters IBI1, IBI2,..., IBI n in sequence and then connect them across the α1 of the α-phase circuit and the β1 of the β-phase circuit respectively; where n is a positive integer.

3. The electrified railway energy router system according to claim 1, characterized in that: The inverter BTB α and inverter BTB β There are two structures: parallel and cascade; the inverter BTB α The parallel structure is to connect the inverter BTB α1 , BTB α2 , ..., BTB αn The AC side of the α phase circuit is connected to the isolation transformer MT α The corresponding n secondary windings, isolation transformer MT α One end of the primary winding is connected to the α phase circuit at α2, and the other end is connected to the rail X α The inverter BTB α The cascade structure is to connect the inverter BTB α1 , BTB α2 , ..., BTB αn The AC side of the α phase circuit is cascaded in sequence and connected across the α2 of the α phase circuit and the rail X α The inverter BTB β The parallel structure is to connect the inverter BTB β1 , BTB β2 , ..., BTB βn The AC side is connected to the isolation transformer MT on the β phase circuit side. β The corresponding n secondary windings, isolation transformer MT β One end of the primary winding is connected to the β phase circuit at β2, and the other end is connected to the β phase circuit at β2. β The inverter BTB β The cascade structure is to connect the inverter BTB β1 , BTB β2 , ..., BTB βn The AC side of the β2 phase circuit and the rail X2 phase circuit are connected in cascade. β Place.

4. The electrified railway energy router system according to claims 1 to 3, characterized in that: The DC bus DCB has two structures: single bus and multi - bus. The single - bus structure of the DC bus DCB is a DC bus DCB with only one parallel DC source DS and capacitor DFC, and the DC sides of inverters BTB α1 、BTB α2 、...、BTB αn 、BTB β1 、BTB β2 、...、BTB βn and cross - phase inverters IBI1, IBI2, ..., IBI n are all connected to the DC bus DCB at the same time; The multi - bus structure of the DC bus DCB means there are n DC buses DCB1, DCB2, …, DCBn, and the DC sides of inverter BTB α1 、inverter BTB β1 and cross - phase inverter IBI1 are all connected to the DC bus DCB1 with parallel DC source DS1 and capacitor DFC1. The DC sides of inverter BTB α2 、inverter BTB β2 and cross - phase inverter IBI2 are all connected to the DC bus DCB2 with parallel DC source DS2 and capacitor DFC2, …, the DC sides of inverter BTB αn 、inverter BTB βn and cross - phase inverter IBI n are all connected to the DC bus DCB n with parallel DC source DS n and capacitor DFC n .

5. The electrified railway energy router system according to claim 1, characterized in that The DC power source DS includes, but is not limited to, new energy sources such as energy storage devices, photovoltaics, fuel cells, and other power sources that are converted into DC output through transformation.

6. A control method for the electrified railway energy router system according to claim 1, characterized in that: The controller CC includes an energy management layer and a device control layer. The energy management layer is capable of coordinating the real-time power interaction between the α-phase circuit and the β-phase circuit, and the real-time power interaction between the cross-phase inverter IBI, the inverter BTB α , the inverter BTB β , and between each pair of them and the α-phase circuit, the β-phase circuit, and the DC source DS, as well as the real-time power interaction between the renewable energy and the energy storage device inside the DC source DS; the energy management layer also has the functions of detecting the real-time operating state of each inverter, judging whether there is a fault, and timely removing the faulty device; the energy management layer also monitors the real-time voltage, current, power of the traction load of the α-phase circuit and the β-phase circuit, and the real-time power of the renewable energy in the DC source DS and the real-time operating state of the energy storage device in the DC source DS, and conducts energy management based on the goals of renewable energy consumption, regenerative braking energy recovery and utilization, and power quality compensation, determines the current operating mode of the electrified railway energy router system and the reference values of the active power and reactive power transferred by the cross-phase inverter IBI, the inverter BTB α , the inverter BTB β , calculates the reference values of the output of the renewable energy in the DC source DS and the charging and discharging power of the energy storage device, and then sends the results to the device control layer; the device control layer adopts control strategies to control the operating states of the cross-phase inverter IBI, the inverter BTB α , the inverter BTB β , the renewable energy, and the energy storage device, where the control strategies include but are not limited to voltage / current / power closed-loop control and model predictive control.

7. The control method for the electrified railway energy router system according to claim 6, characterized in that: The controller CC controls the active power transferred to the α-phase circuit and the β-phase circuit of the electrified railway energy router system. Preferably: where P α and P β respectively represent the active power target values transferred to the α-phase circuit and the β-phase circuit, P Lα and P Lβ respectively represent the active powers of the traction loads in the α-phase circuit and the β-phase circuit, P PV represents the output power of renewable energy in the DC source DS, and P ESS represents the output power of the energy storage device in the DC source DS; Based on the theory of the electrified railway traction power supply system, there is a 60° phase difference between the α-phase circuit and the β-phase circuit. The interphase inverter IBI connected across the two phases can inject active power into the α-phase circuit and the β-phase circuit as follows: Wherein, P IBIα , P IBIβ respectively represent the active power injected into the α-phase circuit and the β-phase circuit of the interphase inverter IBI, V mα , V mβ respectively represent the effective values of the voltages of the α-phase circuit and the β-phase circuit, I IBI represents the effective value of the current of the interphase inverter IBI, Indicates the phase difference between the current of the interphase inverter IBI and the circuit voltage of phase α; at this time, the additional reactive power generated by the interphase inverter IBI is: where Q IBIα and Q IBIβ respectively represent the reactive power injected by the cross-phase inverter IBI into the α-phase circuit and the β-phase circuit; In addition, the relationship between the active power transferred by the interphase inverter IBI, the inverter BTB α and the inverter BTB β is as follows: Where, P BTBα , P BTBβ respectively represent the active power injected by the inverter BTB α and the inverter BTB β into the α-phase circuit and the β-phase circuit; Interphase inverter IBI, inverter BTB α and inverter BTB β The relationship between the reactive power is as follows: Where, Q BTBα and Q BTBβ respectively represent the reactive power injected by the inverter BTB α and the inverter BTB β into the α-phase circuit and the β-phase circuit; Q Tα and Q Tβ respectively represent the reactive power injected by the traction transformer into the α-phase circuit and the β-phase circuit; Q Lα and Q Lβ respectively represent the reactive power generated by the traction loads of the α-phase circuit and the β-phase circuit.

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