CN115173397A - Railway energy router circuit topology, power supply system and control method - Google Patents
Railway energy router circuit topology, power supply system and control method Download PDFInfo
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- CN115173397A CN115173397A CN202210680751.7A CN202210680751A CN115173397A CN 115173397 A CN115173397 A CN 115173397A CN 202210680751 A CN202210680751 A CN 202210680751A CN 115173397 A CN115173397 A CN 115173397A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The technology belongs to the technical field of rail transit traction power supply, and discloses a railway energy router circuit topology, a power supply system and a control method. The system comprises a flexible power supply converter unit, a power supply unit and a control unit, wherein the flexible power supply converter unit is used for flexibly supplying power to a train in a neutral zone; the new energy access unit transmits the new energy electric energy to the direct current bus; the energy storage unit is connected to the direct current bus to realize energy interaction with other units; the alternating current-direct current-alternating current bidirectional converter unit is used for reactive compensation and energy fusion between power supply arms and energy interaction between the flexible power supply converter unit and the energy storage unit and between the flexible power supply converter unit and new energy; and the control protection system controls the working state of the corresponding unit according to the voltage and the current of the power supply arm and the neutral zone and the position of the locomotive. The invention realizes the electric energy quality control of the traction power supply system, the flexible passing of the train through the neutral section, the local absorption of new energy, the utilization of regenerative braking energy and the peak clipping and valley filling of power, and comprehensively solves various problems of the traction power supply system of the electrified railway.
Description
Technical Field
The technology belongs to the technical field of rail transit traction power supply, and particularly relates to a railway energy router circuit topology, a power supply system and a control method.
Background
The electrified railway adopts a single-phase, power-frequency and alternating-current power supply system, mainly comprises a traction substation and a contact network, and is shown in figure 1. A three-phase 110kV or 220kV power supply of a public power grid is converted into a two-phase 25kV power supply through a traction transformer to supply power to a power supply arm a and a power supply arm b respectively, and the traditional power supply mode is simple and reliable in structure, but has the following problems:
1) The phase and amplitude of the voltage of the contact network of the power supply arm a and the power supply arm b are different, so that an electric split phase must be arranged between the two phases, the train needs to be powered off and passes through the electric split phase, the traction and speed loss exists, and the operation efficiency and safety of the train are influenced.
2) The train is a nonlinear load, the problems of low power factor, harmonic distortion, voltage fluctuation and other electric energy quality exist, and the loads of the power supply arm a and the power supply arm b are generally unequal, so that the problem of three-phase imbalance of the public power grid is serious.
3) The train is a movable and intermittent load, the load fluctuation of a power supply arm is large, the impact is large, and the adverse effect is caused on a power grid.
4) The regenerative braking energy of the train is low in absorption and utilization rate of other trains on the same power supply arm, most of the regenerative braking energy is fed back to the traction network, so that the power grid is polluted, and economic benefits are not generated on the railway.
5) The new energy resources such as photovoltaic and wind power along the railway are rich, but the new energy resources along the railway and the railway traction power utilization are not effectively developed and utilized at present.
The above-mentioned individual problems are solved in the prior art by the following corresponding measures. For example, in order to solve the problems of power quality and electric phase splitting, the prior art provides an in-phase power supply system which can cancel the electric phase splitting of a substation, so that the voltage phase and amplitude obtained by a locomotive in the running process are kept continuous without sudden change, and the power is not required to be cut off when the phase splitting is carried out. The power supply of the traction network of the system is mainly provided by a traction transformer direct supply loop, and the compensation loop converts an out-of-phase power supply into a power supply with the same voltage phase and amplitude as the direct supply loop through a converter, so that in-phase power supply is realized. The converter compensation loop mainly realizes negative sequence management, a power supply of a traction network is mainly provided by a direct supply loop, and the voltage amplitude of the direct supply loop is fixed and uncontrollable. In addition, a full-power through in-phase power supply device is provided, an incoming line power supply of the system is supplied to a traction network after passing through an AC-DC-AC converter, and the mode can realize voltage phase and amplitude adjustment, but the full-power through in-phase power supply has high investment cost and large loss.
Meanwhile, in the prior art, an RPC + energy storage mode is adopted to realize electric energy quality control and regenerative braking energy utilization; the electric neutral section passing technology of the train is realized by adopting the ground automatic neutral section passing technology based on a power electronic switch and the flexible ground automatic neutral section passing technology, so that the electric neutral section problem of the railway is solved.
However, the above-mentioned technologies can only solve one or two problems of the traction power supply system of the electrified railway at the same time, and there is no comprehensive and systematic solution for the above-mentioned problems.
Disclosure of Invention
Aiming at the problems of electric energy quality, electric phase splitting, new energy utilization, regenerative braking energy utilization and the like of the traditional alternating current traction power supply system of the electrified railway and the current situation that no system solution exists at present, the invention provides a railway energy router circuit topology and a power supply system, wherein the system can realize the access of energy storage equipment to improve the regenerative braking energy utilization and the power peak clipping and valley filling, and simultaneously solves the problems of electric energy quality and electric phase splitting. The specific technical scheme is as follows:
a railway energy router circuit topology and power supply system comprises a control protection system, an alternating current-direct current-alternating current bidirectional converter unit, a flexible power supply converter unit, a new energy access unit and an energy storage unit, wherein the alternating current-direct current-alternating current bidirectional converter unit, the flexible power supply converter unit, the new energy access unit and the energy storage unit share a direct current bus; the alternating current, direct current and alternating current bidirectional converter unit is used for reactive compensation of power supply arms, energy fusion between the two power supply arms and energy interaction with the flexible power supply converter unit, the energy storage unit and the new energy access unit; the flexible power supply converter unit flexibly supplies power to the train in the neutral zone of the electric split phase; the new energy access unit transmits the electric energy of the new energy to the direct current bus; the energy storage unit is used for carrying out energy interaction with other units; and the control protection system controls the working state of the corresponding unit according to the voltage and the current of the power supply arm and the neutral zone and the position of the locomotive.
Preferably, the ac-dc-ac bidirectional converter unit includes two step-down transformers and an ac-dc-ac bidirectional converter; the alternating current-direct current-alternating current bidirectional converter is a back-to-back structure formed by two alternating current-direct current converters sharing a direct current side, and alternating current sides of the two alternating current-direct current converters are respectively connected to two power supply arms through step-down transformers.
Preferably, the flexible power supply converter unit comprises a flexible power supply converter and a step-up transformer; the flexible power supply converter and the AC-DC-AC bidirectional converter share a DC bus, and the AC side of the flexible power supply converter is connected into a neutral zone through a step-up transformer.
Preferably, the new energy access unit comprises an access converter and a new energy; the new energy is connected with the direct current bus through the access converter.
Preferably, the energy storage unit comprises an energy storage medium and a DC/DC converter; the energy storage medium is connected with the direct current bus through the DC/DC converter.
Preferably, the control protection system comprises a master controller and a slave controller; the master controller comprises an information acquisition unit and a control protection unit; the master controller collects the voltage and current of the power supply arm and the neutral zone and the position information of the electric split-phase section train through the information collection unit, controls the slave controller through the control protection unit according to the collected information so as to control the working state of each converter in real time, and realizes corresponding device protection.
Preferably, the slave controllers comprise a first slave controller, a second slave controller, a third slave controller and a fourth slave controller, which are respectively used for controlling the ac-DC-ac bidirectional converter, the flexible power supply converter, the DC/DC converter and the access converter.
The invention also aims to provide a control method of the railway energy router circuit topology and the power supply system, which applies the railway energy router circuit topology and the power supply system; the control method comprises the following steps:
s1, flexible power supply control: when no train passes through the neutral zone of the electric split phase, the flexible power supply converter unit is controlled to be in a standby state so that no voltage is output; when a train is about to pass through a neutral zone of the electric phase splitting, the flexible power supply converter outputs alternating current, the alternating current is boosted by the booster transformer and then outputs voltage to the neutral zone to supply power to the train, and the phase and amplitude of the output voltage are continuously adjusted;
s2, energy storage control: when the sum of the power of the two power supply arms, the new energy power generation power and the flexible power supply power is less than 0, controlling the energy storage unit to absorb energy for storage; when the sum of the power of the two power supply arms, the new energy power generation power and the flexible power supply power is larger than 0 and the power of any power supply arm is larger than a set peak value, the energy storage unit is controlled to release energy to carry out peak clipping and valley filling.
Preferably, the method for adjusting the phase and amplitude of the output voltage includes: when the train is about to pass through a neutral zone of the electric phase splitting, the flexible power supply converter unit is controlled to start, the phase and amplitude of the output voltage of the flexible power supply converter unit are completely consistent with the phase and amplitude of the voltage of the initial power supply arm, and the train enters the neutral zone in an electrified mode; when the train completely enters the neutral zone, the flexible power supply converter unit is controlled to gradually adjust the amplitude and the phase of the output voltage by taking the voltage of the terminal power supply arm as a target, so that the phase and the amplitude of the voltage output to the neutral zone are completely equal to the phase and the amplitude of the voltage of the terminal power supply arm before the train exits from the neutral zone, and the train enters the terminal power supply arm in an electrified mode.
Preferably, the method for gradually adjusting the amplitude and the phase of the output voltage by taking the voltage of the end-point power supply arm as a target includes: starting the adjustment at time t0, when Ud0= Ua; the output voltage of the flexible power supply converter unit is regulated to Ub from Ua in n periods T, the regulation quantity of each period is delta u, and Udn = Ua + n delta u = Ub in the nth period T;
wherein t0 is the time when the train completely enters the neutral zone, and tn is the time before the train exits the neutral zone; and Ud0 and Udn are output voltages of the flexible power supply converter unit when T0 and tn are respectively, ua and Ub are voltages of a starting power supply arm and an end power supply arm respectively, and delta u is a phase and amplitude difference in 1 period T of train operation.
Compared with the prior art, the invention has the following beneficial effects:
the railway energy router circuit topology and the power supply system can realize the functions of electric energy quality control, train flexible passing neutral section, new energy local absorption, regenerative braking energy utilization, power peak clipping and valley filling and the like of a traction power supply system, and comprehensively solve various problems of the traction power supply system of the electrified railway. All the units share a direct current bus, energy is coupled with one another, and the utilization rate of electric energy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic drawing of traction power supply of an electrified railway in the prior art.
Fig. 2 is a schematic structural diagram of a circuit topology and a power supply system of the railway energy router according to embodiment 1.
Fig. 3 is a schematic diagram of a topology of a two-level ac-dc-ac converter according to embodiment 1.
Fig. 4 is a schematic structural diagram of the control protection system according to embodiment 1.
Fig. 5 is a voltage output phasor diagram of a flexible power supply converter unit in embodiment 1.
Fig. 6 is a schematic diagram illustrating the division of the operation intervals of the energy storage unit in embodiment 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 2, the present embodiment provides a circuit topology and a power supply system of a railway energy router, which includes a control protection system, an ac-dc-ac bidirectional converter unit, a flexible power supply converter unit, a new energy access unit, and an energy storage unit. The AC-DC-AC bidirectional converter unit is used for reactive compensation and energy fusion between power supply arms and energy interaction between the AC-DC-AC bidirectional converter unit and the flexible power supply converter unit, the energy storage unit and new energy; the flexible power supply converter unit flexibly supplies power to the train in the neutral zone of the electric split phase; the new energy access unit transmits the new energy electric energy to the direct current bus; the energy storage unit is connected to the direct current bus to realize energy interaction with other units, and the functions of energy storage and reutilization, peak clipping and valley filling are realized; all the units share a direct current bus; and the control protection system controls the working state of the corresponding unit according to the voltage and the current of the power supply arm and the neutral zone and the position of the locomotive.
In a preferred embodiment, the ac-dc-ac bidirectional converter unit includes a step-down transformer T1, a step-down transformer T2 and an ac-dc-ac bidirectional converter. As shown in fig. 3, the ac-dc-ac bidirectional converter is a back-to-back structure formed by a grid-side converter U1 and a grid-side converter U2 sharing a dc side. The ac-dc-ac bidirectional converter has a two-level structure, and it can be understood that the ac-dc-ac bidirectional converter may also have a three-level structure. The component devices of the AC-DC-AC bidirectional converter comprise one or more of an IGBT, an IEGT and an IGCT.
The grid-side converter U1 and the grid-side converter U1 are AC-DC converters, the AC side of the grid-side converter U1 is connected to the power supply arm a through a step-down transformer T1 and a switch Ka, and the AC side of the grid-side converter U2 is connected to the power supply arm b through a step-down transformer T2 and a switch Kb.
The flexible power supply converter unit comprises a flexible power supply converter U3 and a booster transformer T3; the flexible power supply converter U3 is an inverter; the direct current side of the flexible power supply converter U3 is connected with the direct current bus L, and the alternating current side of the flexible power supply converter U3 is connected into a neutral zone through the step-up transformer T3 and the switch Kd.
The new energy access unit comprises an access converter U5 and new energy; the new energy is connected with the direct current bus through the access converter U5. In this embodiment, the new energy is photovoltaic power generation and/or wind power generation. The access converter is a DC/DC converter and/or an AC/DC converter.
The energy storage unit comprises an energy storage medium and a DC/DC converter U4; the energy storage medium is connected with the direct current bus L through the DC/DC converter U4. The energy storage medium can be one or more of lithium batteries, super capacitors, flywheels and other energy storage devices.
As shown in fig. 4, the control and protection system includes a master controller and a slave controller. The master controller comprises an information acquisition unit and a control protection unit, wherein the information acquired by the information acquisition unit comprises voltage signals PTa, PTb and PTd of a power supply arm a, a power supply arm b and a neutral zone, current signals CTa and CTb of the power supply arm a and the power supply arm b and a direct current bus voltage signal Udc, and position information PS1, PS2 and PS3 of a train about to enter, completely enter and leave the neutral zone. The master controller sends control instructions to the corresponding converter units through the slave controllers so as to control the working state of each converter in real time and carry out corresponding device protection. Specifically, the slave controllers comprise a first slave controller, a second slave controller, a third slave controller and a fourth slave controller, and are respectively used for controlling a grid-side converter U1, a grid-side converter U2, a flexible power supply converter U3, a DC/DC converter U4 and an access converter U5 of the AC-DC-AC bidirectional converter.
The railway energy router circuit topology and power supply system of the embodiment can realize the functions of electric energy management, neutral zone flexible power supply, new energy access and energy storage, and the specific working principle is as follows.
(1) Electric energy management function
On one hand, the network side converter U1 and the network side converter U2 can respectively compensate the reactive power of the power supply arm a and the power supply arm b, so that the power factor is improved and the network voltage of the power supply arm is stabilized; on the other hand, active power can be fused between the grid-side converter U1 and the grid-side converter U2, and power balance of the two power supply arms is realized, so that a three-phase imbalance management function is realized. If Pa is greater than Pb, the fusion power Pc is (Pa-Pb)/2, namely the Pc is transferred from the power supply arm b to the power supply arm a, so that the active power of the two power supply arms is balanced, and the power factor is 1. Pa and Pb are powers of the power supply arm a and the power supply arm b, respectively.
(2) Neutral zone flexible power supply function
The flexible power supply converter unit realizes that an alternating current power supply Ud is output to a neutral region of an electric split phase, and provides power for a train in the neutral region. The flexible power supply converter U3 is powered from the direct current side of the flexible power supply converter U3, and when no train passes through a neutral zone, the flexible power supply converter U3 is controlled to be in a standby state and no voltage is output; when a train is about to pass through the electric split phase, the alternating current output by the flexible power supply converter U3 is boosted by the transformer T3, then the output voltage Ud is output to the neutral region to supply power to the train, and the phase and amplitude of the output voltage Ud are continuously adjusted to realize the flexible split phase passing of the train.
Taking the example that the train drives from the power supply arm a to the power supply arm b, the specific control method of the neutral zone flexible power supply is as follows: when the train reaches the PS1 position, the flexible power supply converter unit starts to work, the phase and amplitude of the output voltage Ud of the flexible power supply converter unit are completely consistent with the phase and amplitude of the voltage of the power supply arm a, and the train enters a neutral zone in an electrified mode; when the train completely enters the neutral zone PS2, the amplitude and the phase of the Ud are gradually adjusted by the flexible power supply converter unit by taking the voltage of the power supply arm b as a target, so that the phase and the amplitude of the voltage Ud output to the neutral zone are completely equal to the phase and the amplitude of the voltage of the power supply arm b before the train exits from the neutral zone, and the train enters the power supply arm b in an electrified mode.
The vector of the control and regulation process of the output voltage Ud of the flexible power supply converter unit is shown in fig. 5, the regulation time is from t0, t1 … … tm to tn, and the corresponding output voltage is from Ud0, ud1 … … Udm to Udn. Specifically, the adjustment is started at time t0, when Ud0= Ua; the output voltage Ud of the flexible power supply converter unit is regulated to Ub from Ua in n periods T; the regulated variable is Δ u per cycle, i.e. the output voltage Ud1= Ua + Δ u after 1 cycle T, and at the nth cycle T, udn = Ua + n Δ u = Ub, and before the train exits the neutral zone, the flexible power supply converter unit output voltage Ud and the power supply arm b voltage reach the same level. In this example, T is 20ms.
Wherein t0 is the time when the train completely enters the neutral zone, and tn is the time before the train exits the neutral zone; ud0 and Udn are output voltages of the flexible power supply converter unit when t0 and tn are respectively, ua and Ub are voltages of a starting power supply arm a and an end power supply arm b respectively, and delta u is a phase and amplitude difference in 1 period of train operation.
(3) New energy access function
Photovoltaic power generation along the railway is connected into a direct current bus through a DC/DC converter, wind power generation is connected into the direct current bus through an AC/DC converter, and then new energy power is transmitted to two power supply arms through a grid-side converter U1 and a grid-side converter U2; and when the sum of the loads of the two power supply arms is less than the new energy power, the energy storage unit stores the sum.
(4) Energy storage function
The energy storage unit is a power buffer between the traction power supply system and the new energy, and has the main functions of further improving the railway regenerative braking energy and the new energy utilization rate and reducing the railway energy consumption.
The energy storage medium of this embodiment takes battery energy storage as an example, the operation interval of the energy storage unit is shown in fig. 6, and the minimum value SOC of the battery energy is preset according to the energy Bat_min Low battery energy SOC Bat_low High value SOC of battery energy Bat_up And maximum battery energy SOC Bat_max Energy absorption or release is performed. The operating conditions are shown in table 1. The energy storage function control method specifically comprises the following steps: when the sum of the power Pa of the power supply arm a, the power Pb of the power supply arm b, the new energy power generation power P3 and the flexible power supply power P5 is less than 0 and the energy storage medium is not full, the energy storage unit absorbs power; when the sum of the power Pa of the power supply arm a, the power Pb of the power supply arm b, the new energy power generation power P3 and the flexible power supply power P5 is greater than 0, and the energy storage medium stores energy, the energy storage unit releases the energy.
The circuit topology of the railway energy router and the units of the power supply system are all provided with the direct current buses, energy is mutually coupled, and functions of electric energy quality control, neutral zone flexible power supply, new energy access, energy storage and the like of the electrified railway can be realized, so that various problems of traction power supply of the electrified railway are comprehensively solved.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection of the claims of the present invention.
Claims (10)
1. A railway energy router circuit topology and power supply system is characterized by comprising a control protection system, an AC-DC-AC bidirectional converter unit sharing a DC bus, a flexible power supply converter unit, a new energy access unit and an energy storage unit; the alternating current, direct current and alternating current bidirectional converter unit is used for reactive compensation of power supply arms, energy fusion between the two power supply arms and energy interaction with the flexible power supply converter unit, the energy storage unit and the new energy access unit; the flexible power supply converter unit flexibly supplies power to the train in the neutral zone of the electric split phase; the new energy access unit transmits the electric energy of the new energy to the direct current bus; the energy storage unit is used for carrying out energy interaction with other units; and the control protection system controls the working state of the corresponding unit according to the voltage and the current of the power supply arm and the neutral zone and the position of the locomotive.
2. The railroad energy router circuit topology and power supply system of claim 1, wherein the ac-dc-ac bidirectional converter unit comprises two step-down transformers and an ac-dc-ac bidirectional converter; the alternating current-direct current-alternating current bidirectional converter is a back-to-back structure formed by two alternating current-direct current converters sharing a direct current side, and alternating current sides of the two alternating current-direct current converters are respectively connected to two power supply arms through step-down transformers.
3. The railroad energy router circuit topology and power supply system of claim 2, wherein the flexible power converter unit comprises a flexible power converter and a step-up transformer; the flexible power supply converter and the AC-DC-AC bidirectional converter share a DC bus, and the AC side of the flexible power supply converter is connected into a neutral zone through a step-up transformer.
4. The railroad energy router circuit topology and power supply system of claim 3, wherein the new energy access unit comprises an access converter and a new energy source; the new energy is connected with the direct current bus through the access converter.
5. The railroad energy router circuit topology and power supply system of claim 4, wherein the energy storage unit comprises an energy storage medium and a DC/DC converter; the energy storage medium is connected with the direct current bus through the DC/DC converter.
6. The railway energy router circuit topology and power supply system of any one of claims 1 to 5, wherein the control protection system comprises a master controller and a slave controller; the master controller comprises an information acquisition unit and a control protection unit; the master controller collects the voltage and current of the power supply arm and the neutral zone and the position information of the electric split-phase section train through the information collection unit, controls the slave controller through the control protection unit according to the collected information so as to control the working state of each converter in real time, and realizes corresponding device protection.
7. The railroad energy router circuit topology and power supply system of claim 6, wherein the slave controllers comprise a first slave controller, a second slave controller, a third slave controller, and a fourth slave controller for controlling an AC-DC-AC bi-directional converter, a flexible power supply converter, a DC/DC converter, and an access converter, respectively.
8. A method for controlling a railway energy router circuit topology and power supply system, characterized in that the railway energy router circuit topology and power supply system according to any one of the claims 1 to 7 is applied; the control method comprises the following steps:
s1, flexible power supply control: when no train passes through the neutral zone of the electric split phase, the flexible power supply converter unit is controlled to be in a standby state so that no voltage is output; when a train is about to pass through a neutral zone of the electric phase splitting, the flexible power supply converter outputs alternating current, the alternating current is boosted by the booster transformer and then outputs voltage to the neutral zone to supply power to the train, and the phase and amplitude of the output voltage are continuously adjusted;
s2, energy storage control: when the sum of the power of the two power supply arms, the new energy power generation power and the flexible power supply power is less than 0, controlling the energy storage unit to absorb energy for storage; when the sum of the power of the two power supply arms, the new energy power generation power and the flexible power supply power is larger than 0 and the power of any power supply arm is larger than a set peak value, the energy storage unit is controlled to release energy to carry out peak clipping and valley filling.
9. The method for controlling the topology of a railway energy router circuit and the power supply system of claim 8, wherein the adjusting method of the phase and amplitude of the output voltage comprises: when the train is about to pass through a neutral zone of the electric split phase, the flexible power supply converter unit is controlled to start, the phase and amplitude of the output voltage of the flexible power supply converter unit are completely consistent with the phase and amplitude of the voltage of the initial power supply arm, and the train enters the neutral zone in an electrified mode; when the train completely enters the neutral zone, the flexible power supply converter unit is controlled to gradually adjust the amplitude and the phase of the output voltage by taking the voltage of the terminal power supply arm as a target, so that the phase and the amplitude of the voltage output to the neutral zone are completely equal to the phase and the amplitude of the voltage of the terminal power supply arm before the train exits from the neutral zone, and the train enters the terminal power supply arm in an electrified mode.
10. The method for controlling a railway energy router circuit topology and a power supply system according to claim 9, wherein the method for gradually adjusting the amplitude and phase of the output voltage with the voltage of the end point power supply arm as a target comprises: starting the adjustment at time t0, when Ud0= Ua; the output voltage of the flexible power supply converter unit is regulated to Ub from Ua within n periods T, the regulating quantity of each period is delta u, and Udn = Ua + n delta u = Ub in the nth period T;
wherein t0 is the time when the train completely enters the neutral zone, and tn is the time before the train exits the neutral zone; and Ud0 and Udn are output voltages of the flexible power supply converter unit when t0 and tn are respectively, ua and Ub are voltages of a starting power supply arm and an end power supply arm respectively, and delta u is a phase and amplitude difference in 1 period of train operation.
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