Electrified railway energy router system and control method thereof

Abstract

The invention discloses an electrified railway energy router system and a control method thereof, and relates to the technical field of electrified railway traction power supply. The back-to-back inverter BTB is composed of an inverter BTBalpha on the alpha-phase circuit side and an inverter BTBbeta on the beta-phase circuit side, and the direct current side of the cross-phase inverter IBI, the direct current side of the inverter BTBalpha and the direct current side of the inverter BTBbeta are all connected into the direct current bus DCB to form a star-shaped structure. The controller CC monitors and analyzes operation parameters of the traction load through a bidirectional signal port and controls output of renewable energy sources in the direct current source DS, charging and discharging of the energy storage device and working states of the cross-phase inverter IBI and the back-to-back inverter BTB, and the problems that a traditional back-to-back structure railway energy router is high in cost and difficult in engineering application are solved.

Description

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 achievements in rail electrification development. The domestic electrified railway mileage has exceeded 146,000 kilometers, with huge carbon emissions and electricity demand. The optimization of the energy structure of electrified railways is of great significance to achieving "carbon neutrality". Therefore, the integration of green renewable energy and electrified railways, energy storage and recovery of train regenerative braking energy and other technologies have become the development trend of electrified railway technology.

[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, 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 the 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 occupancy fees, resulting in high actual engineering costs and difficulties in promotion and application.

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

[0005] The purpose of the present invention is to provide an electrified railway energy router system and a control method thereof, 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).

[0006] 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 sideβ 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 to 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 the α2 of the α phase circuit, and the other end is connected to the rail X α Grounding at the inverter BTB β One end of the AC side is connected to the 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 the inverter BTB respectively. α 、Inverter BTB β , the signal end of the DC source DS, 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 active power distribution and power quality compensation by monitoring and analyzing the operating parameters of the traction load and controlling the renewable energy output and the charging and discharging of the energy storage device in the DC source DS, as well as the working states of the inter-phase inverter IBI and the back-to-back inverter BTB.

[0007] 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.

[0008] 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 αOne 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.

[0009] 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 each inverter 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 β1 The 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 IBIn The DC side of the n and capacitor DFC n DC bus DCB n .

[0010] 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.

[0011] Furthermore, a control method for an electrified railway energy router system is provided, wherein the controller CC includes an energy management layer and an equipment 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 inside 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 carrying out energy management based on the goals of renewable energy consumption, regenerative braking energy recovery and power quality compensation, and determining 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 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.

[0012] 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:

[0013]

[0014] Where P α , P β They represent the target active power values ​​transferred to the α-phase circuit and the β-phase circuit, respectively. Lα , P Lβ Respectively represent the active power of the α-phase circuit and the β-phase circuit traction load, PPV 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 system, 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]

[0017] 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 Respectively represent the voltage effective value of the α phase circuit and the β phase circuit, I IBI It represents the effective value of the current of the cross-phase inverter IBI, It indicates that the current of the inter-phase inverter IBI lags behind the voltage of the α-phase circuit; at this time, the extra reactive power generated by the inter-phase inverter IBI is:

[0018]

[0019] In the formula, 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;

[0020] In addition, the inter-phase inverter IBI, inverter BTB α and inverter BTB β The relationship between the active power transferred is:

[0021]

[0022] Where P BTBα , P BTBβ Respectively represent inverter BTB α and inverter BTB β Active power injected into the α-phase circuit and the β-phase circuit;

[0023] IBI inverter, BTB inverter α and inverter BTB β The relationship between the reactive power is:

[0024]

[0025] In the formula, Q BTBα , Q BTBβ Respectively represent inverter BTBα 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.

[0026] The beneficial effects of adopting this technical solution are:

[0027] (1) The present invention proposes a star structure of an electrified railway energy router system composed of a cross-phase inverter and a back-to-back inverter hybrid topology, which can realize the full functions of active power integration, negative sequence suppression, reactive power compensation and recycling of regenerative braking energy of a traction power supply system (including traction stations and substations) containing renewable energy and energy storage devices based on a traditional back-to-back inverter railway energy router;

[0028] (2) The present invention proposes a star 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 back-to-back inverter railway energy router, and overcomes the shortcomings of the cross-phase inverter railway energy router requiring an additional reactive power compensation device and the large hardware capacity of the back-to-back inverter railway energy router, thus solving the problems of large hardware capacity, high cost and difficulty in engineering application in the existing railway energy router system;

[0029] (3) The present invention has a simple structure and is easy to control. It can effectively access and absorb renewable energy along the railway; 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 of 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 rate, and reduces the equipment capacity occupation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a star structure topology diagram of the present invention;

[0031] Figure 2 is a system structure block diagram of a first embodiment of the present invention;

[0032] Figure 3 is a system structure block diagram of a second embodiment of the present invention;

[0033] Figure 4 is a system structure block diagram of a third embodiment of the present invention;

[0034] Figure 5 is a system structure block diagram of a fourth embodiment of the present invention;

[0035] Figure 6 is a system structure block diagram of a fifth embodiment of the present invention;

[0036] Figure 7 is a system structure block diagram of a sixth embodiment of the present invention; DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be further described below in conjunction with the drawings of specific embodiments. Obviously, the embodiments described below are partial embodiments of the present invention, 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 creative work are within the scope of protection of the present invention.

[0038] 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 A back-to-back structure is formed, which can realize 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 cross-phase inverter railway energy router IBI, which shares the DC bus with the back-to-back inverter railway energy router BTB, is connected between the α-phase circuit and the β-phase circuit, providing another power interaction 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.

[0039] As attached Figure 1 As shown in the figure, it is a star structure topology diagram of an electrified railway energy router system of the present invention, wherein the railway energy router system includes 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, characterized in that: 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 The inverter IBI and the inverter BTB on the α-phase circuit side are composed of 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, and 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 Grounding at the inverter BTB β One end of the AC side is connected to the β2 of the β phase circuit, and the other end is connected to the rail Xβ The bidirectional signal port of the controller CC is connected to the inter-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, 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 realizes reasonable active power distribution and power quality compensation by monitoring and analyzing the traction load operating parameters and controlling 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.

[0040] 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 、Charging and discharging power of energy storage device P ESS , the active power P transferred to the α-phase circuit by the star-structured railway energy router system α , the active power P transferred to the β-phase circuit by the star-structured railway energy router system β , the reactive power Q transferred to the α-phase circuit by the star-structured railway energy router system α , the reactive power Q transferred to the β-phase circuit by the star-structured railway energy router system β , and satisfies the following equation:

[0041]

[0042] Where D 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 into the 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 into the 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, satisfies:

[0043]

[0044] Where P Lα , P Lβ They represent the active power of the traction load of the α-phase circuit and the β-phase circuit respectively;

[0045] Preferably, based on the theory of electrified railway traction power supply system, 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:

[0046]

[0047] In the formula, I IBI It represents the effective value of the current of the cross-phase inverter IBI, It indicates that the current of the inter-phase inverter IBI lags behind the phase difference of the α-phase circuit voltage. At this time, the extra reactive power generated by the inter-phase inverter IBI is:

[0048]

[0049] Preferably, the α-phase circuit side inverter BTB is required α and β-phase circuit side inverter BTB β The compensated reactive power is:

[0050]

[0051] In the formula, 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.

[0052] like Figure 2 As shown, the present invention specifically provides a technical implementation scheme of the 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 IBIOne 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 The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 The β-phase circuit side inverter BTB is connected in parallel. 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 , and the DC side thereof is connected to the DC bus DCB of the parallel DC source DS and the capacitor DFC. Wherein, n is a positive integer.

[0053] like Figure 3 As shown, 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 cascaded 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 BTBα The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 The β-phase circuit side inverter BTB is connected in parallel. β1 , BTB β2 , ..., BTB βn The AC side is connected to the β side isolation transformer MT β The 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 The DC sides are all connected to a DC bus DCB connected in parallel with a DC source DS and a capacitor DFC.

[0054] like Figure 4 As shown, 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 The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 αThe β-phase circuit side inverter BTB β The β-phase circuit side inverter BTB is connected in parallel. 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 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 each inverter is connected to a DC bus DCB2 with a DC source DS2 and a capacitor DFC2 in parallel, ..., an inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the n and capacitor DFC n DC bus DCB n .

[0055] like Figure 5 As shown, 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 cascaded 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 The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 The β-phase circuit side inverter BTB is connected in parallel. 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 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 each inverter is connected to a DC bus DCB2 with a DC source DS2 and a capacitor DFC2 in parallel, ..., an inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the n and capacitor DFC n DC bus DCB n .

[0056] like Figure 6 As shown, 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 The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 αOne 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 The cascade structure is adopted to connect 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 each inverter is connected to a DC bus DCB2 with a DC source DS2 and a capacitor DFC2 in parallel, ..., an inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the n and capacitor DFC n DC bus DCB n .

[0057] like Figure 7 As shown, 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 nThe AC sides of the cross-phase inverters IBI1 are cascaded 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 The parallel structure is adopted to connect the inverter BTB on the α phase circuit side 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 The cascade structure is adopted to connect 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 β2The DC side of each inverter is connected to a DC bus DCB2 with a DC source DS2 and a capacitor DFC2 in parallel, ..., an inter-phase inverter IBI n , α-phase circuit side inverter BTB αn , β-phase circuit side inverter BTB βn The DC side of the n and capacitor DFC n DC bus DCB n .

[0058] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrified railway energy router system, comprising 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, arranged on two power supply arms of a traction substation or a substation, characterized in that: 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 to 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 the α2 of the α phase circuit, and the other end is connected to the rail X α Grounding at the inverter BTB β One end of the AC side is connected to the 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 the inverter BTB respectively. α 、Inverter BTB β , the signal end of the DC source DS, 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 active power distribution and power quality compensation by monitoring and analyzing the operating parameters of the traction load and controlling the renewable energy output and the charging and discharging of the energy storage device in the DC source DS, as well as the working states of the inter-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 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.

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 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 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 are connected in cascade. β Place.

4. An 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 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 each inverter 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 β1 The 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 n and capacitor DFC n DC bus DCB n .

5. The electrified railway energy router system according to claim 1, characterized in that: 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.

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 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 inside 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 carrying out energy management based on the goals of renewable energy consumption, regenerative braking energy recovery and power quality compensation, and determining 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 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.

7. The control method of an 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 by the electrified railway energy router system, preferably: Where P α , P β They represent the target active power values ​​transferred to the α-phase circuit and the β-phase circuit, respectively. Lα , P Lβ Respectively represent the active power of the α-phase circuit and the β-phase circuit traction 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; Based on the theory of electrified railway traction power supply system, 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: 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 voltage effective value of the α-phase circuit and the β-phase circuit, I IBI It represents the effective value of the current of the cross-phase inverter IBI, It indicates that the current of the inter-phase inverter IBI lags behind the phase difference of the α-phase circuit voltage; at this time, the inter-phase inverter IBI generates additional reactive power: In the formula, 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; In addition, the inter-phase inverter IBI, inverter BTB α and inverter BTB β The relationship between the transferred active power is: Where P BTBα , P BTBβ Respectively represent inverter BTB α and inverter BTB β Active power injected into the α-phase circuit and the β-phase circuit; IBI inverter, BTB inverter α and inverter BTB β The relationship between the reactive power is: In the formula, Q BTBα , Q BTBβ Respectively represent 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 Lββ represents the reactive power generated by the traction load of the α-phase circuit and the β-phase circuit respectively.

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