CN110626220B - Flexible automatic passing neutral section system and control method thereof - Google Patents
Flexible automatic passing neutral section system and control method thereof Download PDFInfo
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- CN110626220B CN110626220B CN201810644298.8A CN201810644298A CN110626220B CN 110626220 B CN110626220 B CN 110626220B CN 201810644298 A CN201810644298 A CN 201810644298A CN 110626220 B CN110626220 B CN 110626220B
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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
- B60M3/04—Arrangements for cutting in and out of individual track sections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a flexible automatic passing neutral section system, which comprises a train position identification subsystem, a signal acquisition subsystem and a signal processing subsystem, wherein the train position identification subsystem is used for detecting the position of a train on a track; the power regulation subsystem is used for receiving the detection signal to realize automatic passing through of the split phase of the train, power quality control and power fusion between the two phase power supply arms; and the energy storage device is used for absorbing braking energy and supplying power to the neutral zone in cooperation with the other phase power supply arm or independently when the power supply arm fails. The invention also discloses a control method, which comprises the following steps: s01, monitoring whether the power supply of the two-phase power supply arm is normal or not in real time when the train passes through the neutral section; s02, when one phase of power supply arm fails, the other phase of power supply arm supplies power to the neutral zone; if the other phase power supply arm can not meet the power supply requirement, the energy storage device is put into cooperation with the other phase power supply arm to supply power; when both sides power supply arm all can't provide the power supply for neutral region, directly provide the power supply for neutral region by energy memory. The system and the method have the advantages of high reliability and the like.
Description
Technical Field
The invention mainly relates to the technical field of rail transit, in particular to a flexible automatic passing neutral section system and a control method thereof.
Background
At present, the electrified railway adopts a single-phase power supply mode, and a neutral zone is inevitably formed between two power supply arms for electric isolation between the power supply arms. The railway company in China commonly uses a vehicle-mounted automatic neutral section passing mode, traction force can be lost to a certain extent when the railway company passes through a neutral section without electricity, so that speed loss is caused, and the influence is more serious particularly in some climbing sections. The high-speed railway in China has the characteristics of large scale and long distance. The number of passing neutral section points of a long-distance line is large, on one hand, the power loss of a train is obvious, the shortening of the running time of the train and the improvement of the efficiency are limited, and on the other hand, the problems of large maintenance workload and long maintenance time of a high-speed train are caused by the existing vehicle-mounted automatic passing neutral section scheme. Therefore, there is a need to develop a device and a scheme for uninterrupted passing phase. Many scholars and companies have studied in this respect, but from the perspective of existing research and devices, there is often a lack of a certain backup means for failure, and if the power supply side of the device fails, the device needs to quit operation in its entirety, thereby causing loss or even risk to the train passing through the phase separation.
The main categories of the method are mainly divided into a power-off passing neutral section and a charged passing neutral section according to whether a vehicle-mounted main circuit breaker of the electric locomotive is disconnected when the electric locomotive passes through the neutral section.
(I) automatic passing neutral section in case of power failure
According to the mode, the train detects the ground sensor signal, the locomotive output is adjusted, and the main breaking and the closing are carried out, so that the automatic power failure of the train is realized and the train passes through a neutral zone.
1) The main advantages are that: the train automatically completes the operation of the main breaker and the traction circuit without manual intervention, thereby reducing the labor intensity of a driver and avoiding the damage caused by misoperation of the driver; the technology is mature, and the requirements of low-speed, normal-speed, quasi-high-speed and high-speed trains can be met;
2) The main disadvantages are that: the outage interval is longer, and the defects of train traction reduction, large speed loss, overvoltage impact and the like exist. When the large slope runs at a low speed, the time between the automatic split-phase power-off and the switching-on is long, the speed loss of the locomotive is large, and the traction loss is serious; the speed attenuation is large after the train passes through the phase separation area, and the electric energy consumption is large in the process of re-acceleration; meanwhile, the circuit breaker is limited by the mechanical life, so that the circuit breaker is frequently switched on and off, the service life of the circuit breaker is greatly shortened, and the maintenance amount is large. Meanwhile, with the development of fast railways and heavy haul railways in China, the requirements of the fast railways and the heavy haul railways cannot be met more and more by the power-off and phase-passing mode.
(II) charged automatic passing neutral section
In view of the main problems of power-off passing neutral section, the technical scheme of charged passing neutral section is developed. The charged passing neutral section mode mainly comprises two modes of an on-column type automatic passing neutral section device and a ground automatic passing neutral section device. The ground automatic neutral-section passing device is researched more.
The patent of 'method for realizing train electrified automatic passing through phase by adopting power electronic conversion device', adopts a phase-changing switch of a ground automatic passing through phase-changing device, introduces a power supply with power more than or equal to 12000kW from a power supply side of a power grid, provides a loop power supply for a neutral zone through AC-DC-AC conversion of the power electronic device, and can realize 27.5kV voltage full power output of any specified phase or target phase. The device can also ensure that the train runs in a neutral zone in an electrified way and passes through a phase separation zone without speed reduction. Compared with other existing passing neutral section modes, the train can smoothly transit between the power supply arm and the neutral section, has no operation overvoltage, and has the characteristic of flexible passing neutral section. However, compared with the design of the invention, the device of the patent is a single source, and the power supply channel is single, so that the reliability is difficult to ensure.
In the patent of traction network electric phase splitting non-outage flexible connection-compensation device and method, the device mainly comprises a two-phase back-to-back converter set, three position sensors and two single-phase step-down transformer sets. The device has two working modes, not only can realize the uninterrupted neutral section passing function of a train, but also has the functions of power transfer, reactive compensation and harmonic compensation, and can solve the problems of unbalanced three-phase voltage, voltage fluctuation, low power factor and harmonic pollution existing in a traction substation. Compared with most of the existing neutral section passing devices, the neutral section passing device is simpler in wiring, more complete in function and better in adaptability. But the device still has the shortcoming that unilateral power supply is not high in reliability.
The patent 'uninterruptible power supply passing through neutral section' adopts two single-phase transformers and a multi-winding transformer, three AC-DC converters sharing a DC bus and a plurality of isolating switches. The power supply arms on the two sides cooperatively supply power to the neutral section of the touch network through the device, and when the power supply arms on any side have faults, the device adopts a corresponding fault removal strategy to ensure that the device can normally realize the automatic neutral section passing function without power failure. The design method cooperatively utilizes the power supply arms at two sides to supply power to the neutral section, establishes an operation action strategy during fault, can safely and reliably complete the function of uninterrupted power supply neutral section passing, but has the defects of single function of the device, and is difficult to ensure timely adaptive adjustment in the face of different operation states of a traction power supply network.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a high-reliability flexible automatic passing neutral-section system and a control method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a flexible automatic passing neutral section system comprises a train position identification subsystem, a power regulation subsystem and an energy storage device;
the train position identification subsystem is used for detecting whether a train arrives at a designated position on a track, detecting the running direction of the train and whether a track detection section is occupied, and transmitting a detection signal to the power regulation subsystem;
the power regulation subsystem is used for receiving the detection signal of the train position identification subsystem and realizing automatic passing phase separation of the train, power quality control and power fusion between two phase power supply arms according to the detection signal;
the energy storage device is used for absorbing regenerative braking energy of the power supply arms and is matched with the other phase of power supply arm to jointly supply power to the neutral zone when one phase of power supply arm cannot supply power to the neutral zone; or when the two-phase power supply arms can not supply power to the neutral area, the power is supplied to the neutral area.
As a further improvement of the technical scheme:
the power regulation subsystem comprises a first power regulation loop, a second power regulation loop and a third power regulation loop; one end of each of the first power regulation loop and the second power regulation loop is connected with the neutral zone through a third power regulation loop; and the other ends of the first power regulating circuit and the second power regulating circuit are respectively connected with the two-phase power supply arm.
The first power regulating circuit comprises an isolating switch QS1, a circuit breaker QF1, an isolating transformer T1, a circuit breaker QF5, a converter 1# and a circuit breaker QF6 which are sequentially connected in series; the second power regulating circuit comprises an isolating switch QS2, a circuit breaker QF4, an isolating transformer T2, a circuit breaker QF8, a converter 2# and a circuit breaker QF7 which are sequentially connected in series; the third power regulating circuit comprises a breaker QF9, a converter 3# and a breaker QF10 which are sequentially connected in series and an isolation transformer T3.
The invention also discloses a control method based on the flexible automatic passing neutral section system, which comprises the following steps:
s01, monitoring whether power supply of the two-phase power supply arm is normal when the train passes through a neutral section in real time in the running process of the train;
s02, when one phase of power supply arm cannot supply power to the neutral area, the other phase of power supply arm supplies power to the neutral area; if the other phase of power supply arm can not meet the power supply requirement of the neutral zone, the energy storage device is put into use to cooperate with the other phase of power supply arm to jointly supply power to the neutral zone;
when both sides power supply arm all can't be for neutral region power supply, put into energy memory, directly provide the power supply for neutral region by energy memory.
As a further improvement of the technical scheme:
in step S02, the situation that the power supply arm cannot supply power to the neutral zone includes a power supply arm failure or/and a power supply switch failure.
When no train passing neutral section exists, detecting whether energy feedback exists on the power supply arm in real time; when energy is fed back, the energy storage device stores the fed back energy.
When no train passes through neutral section and the power supply arm supplies power normally, the power quality between the two power supply arms is managed and the power is fused through the power regulation subsystem.
The active power, the reactive power and the harmonic decomposition are carried out by collecting the voltage and the current signals of the power supply bus so as to realize the management of the electric energy quality.
When passing through the neutral section, the power regulation subsystem enables the neutral section to be electrified, and the phase is consistent with the phase of the power supply arm at one side; when the train reaches the neutral zone, the phase shift control is carried out by taking the power supply phase of the power supply arm at the other side as a target, and the power supply phase shift is completed within fixed time, so that the power supply phase in the neutral zone is consistent with the power supply phase of the power supply arm at the other side.
In the passing phase separation process, voltage signals of a neutral zone are collected in real time, power output is adjusted in real time, output power changes along with the change of locomotive power, and the maximum value meets the maximum output power of a train.
Compared with the prior art, the invention has the advantages that:
according to the flexible automatic neutral section passing system and the control method thereof, a power supply mode of combining the double power supply arms and the energy storage device is adopted, so that the reliability of neutral section power supply can be improved, and the full-power, safe and stable passing of a locomotive through a neutral section is realized; in addition, the system does not change the protection parameters of the locomotive, the adaptability of the locomotive is strong, and the system also has the functions of electric energy quality control and power fusion; the energy storage device has a regenerative braking energy storage function, and the energy storage device is used for storing and utilizing energy, so that the energy utilization rate of the railway power supply network is improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic diagram of the system of the present invention when passing neutral.
Fig. 3 is a schematic diagram of the system of the present invention during power integration.
Fig. 4 is a block diagram of the system of the present invention.
FIG. 5 is a flow chart of a control method of the present invention.
Detailed Description
The invention is further described below in conjunction with the drawings and the detailed description of the invention.
As shown in fig. 1, the flexible automatic passing neutral section system of the present embodiment includes a train position identification subsystem, a power regulation subsystem and an energy storage device;
the train position identification subsystem is used for detecting whether a train arrives at a designated position on a track, detecting the running direction of the train and whether a track detection interval is occupied, and transmitting a detection signal to the power regulation subsystem;
the power regulation subsystem is used for receiving the detection signal of the train position identification subsystem and realizing automatic passing phase of the train, electric energy quality control between two phase power supply arms and power fusion according to the detection signal;
the energy storage device is used for absorbing regenerative braking energy of the power supply arms and is matched with the other phase power supply arm to jointly supply power to the neutral zone when one phase power supply arm cannot supply power to the neutral zone; or when the two-phase power supply arms can not supply power to the neutral area, the power is supplied to the neutral area.
The flexible automatic neutral-section passing system adopts a power supply mode of combining the double power supply arms and the energy storage device, can improve the reliability of neutral-section power supply, and realizes that a locomotive passes through a neutral-section safely and stably in full power; in addition, the system does not change the protection parameters of the locomotive, the adaptability of the locomotive is strong, and the system also has the functions of electric energy quality control and power fusion; the energy storage device has a regenerative braking energy storage function, and the energy storage device is used for storing and utilizing energy, so that the energy utilization rate of the railway power supply network is improved.
In this embodiment, the power conditioning subsystem includes a first power conditioning loop, a second power conditioning loop, and a third power conditioning loop; one end of each of the first power regulation loop and the second power regulation loop is connected with the neutral zone through a third power regulation loop; the other ends of the first power regulating circuit and the second power regulating circuit are respectively connected with the two-phase power supply arm. The first power regulating circuit comprises an isolating switch QS1, a circuit breaker QF1, an isolating transformer T1, a circuit breaker QF5, a converter 1# and a circuit breaker QF6 which are sequentially connected in series; the second power regulating circuit comprises an isolating switch QS2, a circuit breaker QF4, an isolating transformer T2, a circuit breaker QF8, a converter 2# and a circuit breaker QF7 which are sequentially connected in series; the third power regulating circuit comprises a breaker QF9, a converter 3# and a breaker QF10 which are sequentially connected in series and an isolation transformer T3.
As shown in fig. 1, the system is mainly divided into two subsystems according to functions: the train position identification subsystem and the power regulation subsystem.
(1) Train position identification subsystem
The functions are as follows: the train position identification system mainly realizes train section position identification and is used for detecting whether a train arrives at a designated position on a railway track, detecting the running direction of the train and whether a track detection section is occupied or not, generating a train section position signal according to a signal state after detection and processing, and transmitting the train section position signal to a control system of a power regulation subsystem. The train position identification subsystem consists of a train position sensor (CGn) and a related power supply line.
(2) Power conditioning subsystem
The functions are as follows: and receiving a detection signal of the train position identification subsystem, and realizing the transfer of electric energy from the power supply arm and the energy storage device to the neutral zone and the transfer of energy between the two power supply arms and the energy storage device by controlling the converter unit and the energy storage device, thereby realizing the safe and stable passing of the train through the phase separation zone. When no train passes through, the on-off state of the control circuit breaker is changed, so that the quality control and the power fusion between the two power supply arms are realized, and the energy storage device can be used for storing the feedback energy when the feedback energy exists in the power supply arms. Under the condition that one side of the device fails in power supply, the effects of passing through the neutral section and controlling the quality of electric energy are achieved through the access of stored energy. The power regulation subsystem consists of switching equipment (QSn, QFN), detection and protection equipment (YHn, TANn, BLn), power regulation devices (converters n #, TCn), a control system and related power supply circuits.
Wherein the code descriptions of the devices in FIG. 1 are shown in Table 1:
table 1:
| serial number | (Code) | Device name | Remarks to note |
| 1 | YH1、YH2、YH3 | Voltage transformer | And detecting the bus voltage of the two power supply arms. |
| 2 | QF1、QF2、QF3、QF4 | Circuit breaker | The system is used for switching in and switching out the power regulation subsystem. |
| 3 | QF5~QF11 | Circuit breaker | Switching-in and switching-out converter and energy storage |
| 4 | QS1、QS2 | Isolating switch | Use of a service power conditioning subsystem |
| 5 | TA11、TA21、TA31 | Current transformer | Detect the current of the power supply line for system protection and measurement control. |
| 6 | T1~T5 | Single-phase transformer | Step-up and step-down voltage for realizing power supply voltage |
| 7 | CG1~CG4 | Train position sensor | The device is arranged on two sides of a rail and used for detecting information such as whether a train arrives or not, the direction of the train coming and the like. |
The passing neutral section system of the patent has the following functions:
(1) Ground flexible automatic passing neutral section function
As shown in figure 2, when a train is about to pass through a neutral section, circuit breakers QF 1-QF 10 are closed, isolating switches QS 1-QS 2 are closed, and the whole device is started to be put into operation. Taking a left-side coming train as an example, when the sensor CG1 detects that a train passes through, the CG1 outputs a high-level signal to a controller of the power regulation subsystem, and controls the power regulation subsystem by detecting a left-side bus voltage signal (YH 1), so as to output a voltage in the same phase as the left side, and the neutral section is electrified. The output power is not less than the total power of the long-grouping locomotive, so that the locomotive can enter a neutral zone stably and safely without load shedding;
when the electric locomotive enters a neutral zone and reaches a CG2, the CG2 outputs a high-level signal to a controller of a power regulation subsystem, and the power supply phase of the neutral zone is gradually and smoothly regulated by detecting the phase of a power supply of a right power supply arm, so that the power supply phase of the neutral zone is consistent with the power supply phase of a right bus before the electric locomotive reaches a CG3, and the safe, stable and non-load-shedding driving away from the neutral zone of the locomotive is realized;
when the electric locomotive reaches CG4, the full flow of the electrified automatic passing neutral section of the electric locomotive is completed, and at the moment, the switches QF2 and QF3 are disconnected, so that the converter 3# is stopped. And subsequently, the converter 1# and the converter 2# are utilized to enter an electric energy quality treatment and power fusion mode of the two power supply arms, and the standby vehicle is close to the neutral zone again.
(2) Power fusion and electric energy quality control function
As shown in FIG. 3, when the locomotive is not close to the neutral zone, the complete sets QF1, QF4 and QF 5-QF 8 are closed, and the system is equivalent to a direct-hanging railway power regulator. The converter 1# and the converter 2# are controlled, so that the output voltage is adjusted, and the purposes of adjusting the power of each arm and compensating harmonic waves are achieved.
(3) Energy feedback storage function
When redundant regenerative braking energy exists in the two power supply arms, the energy can be stored in the energy storage device through the converter 1# or the converter 2# and the active energy is output under the traction working condition of the train, so that the aims of energy management and energy saving are fulfilled. The function is suitable for the working conditions of passing neutral section, power fusion and electric energy management.
In summary, as shown in fig. 4, the train position recognition system collects the train position sensor signal, and transmits the signal to the control system to perform the switching between the passing phase function and the power quality management function and the phase shift control during the passing phase function. Under the over-phase working mode, the control system judges whether the running state of the device is normal according to the collected voltage signals (YH 1, YH2 and YH 3) and current signals (TA 11, TA21 and TA 31), and controls the converter to realize the access states of energy transfer, power phase shift phase change and energy storage in a corresponding mode. In the power quality control mode, the control system carries out active, reactive and harmonic decomposition by collecting bus current signals (TA 01 and TA 02) and bus voltage signals (YH 1 and YH 3) and controls the output of the converter and the access state of the stored energy to realize the power quality control function. If the power supply arm has electric energy feedback, the control system accesses the energy storage device to charge the energy storage device. The control system can collect switch state signals (QSn and QFN) and control the on-off of the circuit breaker. The protection system carries out real-time protection by collecting the current signals (TA 1n and TA2 n) of the complete device. The states of the line and the locomotive are judged by collecting bus current signals (TA 01 and TA 02) and bus voltage signals (YH 1 and YH 3), and the control is adjusted to be a set device operation mode.
Three control logics of the system and the control method of the invention are described below with reference to a specific embodiment:
the total control logic is as follows: the coming direction is judged according to train position sensors CG1 and CG4, the running state of a power supply network is judged according to real-time monitoring of TA01, TA02, YH1 and YH3, and a set of device is adjusted to enter a corresponding functional mode.
(1) Split phase mode control logic:
the complete set of device judges the coming direction according to the train position sensors CG1 and CG4, judges the running state of the power supply network according to the real-time monitoring of TA01, TA02, YH1 and YH3, and is adjusted to enter a corresponding functional mode. When the train needs to be subjected to neutral passing, the power regulation subsystem takes the power supply arms on the two sides as power supplies to enable the voltage and the phase of the neutral section to be consistent with the phase of the power supply arm in the coming direction (acquiring signals of the voltage transformers YH1, YH2 and YH3 synchronously and comparing in real time), taking the left coming train as an example, when the train reaches CG1, the train starts to enter a neutral passing mode, the power regulation subsystem enables the neutral section to be electrified, and the phase is consistent with the phase of the power supply arm on the left side. When the train reaches CG2, the phase shift control is carried out by taking the power phase of the right power supply arm as a target, and the power phase shift is finished within fixed time, so that the power phase in the neutral zone is consistent with the power phase of the right power supply arm. During the period, the control system adjusts the power output in real time by acquiring voltage signals in the neutral zone in real time, the output power changes along with the change of the locomotive power, and the maximum value meets the maximum output power of the long marshalling train. When the electric locomotive reaches CG4, the full flow of the electrified automatic passing neutral section of the electric locomotive is completed, at the moment, the switches QF2, QF3, QS9 and QS10 are disconnected, the neutral zone is connected with the converter to be switched into the right power supply arm, the electric energy quality control and power fusion mode of the two power supply arms is subsequently entered, and the standby locomotive is close to the neutral zone again.
(2) The power quality governance control logic: the control device detects the current (TA 01 and TA 02) of the traction power supply bus and the voltage (YH 1 and YH 3) of the bus, calculates the active power, the reactive power and the harmonic wave of the system in real time, outputs the reactive power and the harmonic wave current which have opposite phases and equal amplitudes through the power regulating unit, ensures the high power factor and the low harmonic wave content operation of the two power supply arms, simultaneously transfers half of the power difference value of one side with large active power to one side with small active power, realizes the fusion of the active power, improves the utilization rate of the transformer and inhibits the negative sequence.
(3) Regenerative braking energy storage function: when the system detects that energy feedback exists on the power supply arm, the energy storage mode of energy storage is entered, and the energy storage device is charged to prepare for the supplement and standby power supply of the former two modes. And if the energy storage device reaches a full charge state, feeding the electric energy back to the power supply arm on the other side.
As shown in fig. 5, the present invention also correspondingly discloses a control method based on the above-mentioned flexible automatic passing neutral section system, which comprises the following steps:
s01, monitoring whether power supply of the two-phase power supply arm is normal when the train passes through a neutral section in real time in the running process of the train;
s02, when one phase of power supply arm cannot supply power to the neutral area, the other phase of power supply arm supplies power to the neutral area; if the other phase of power supply arm can not meet the power supply requirement of the neutral zone, the energy storage device is put into use to cooperate with the other phase of power supply arm to jointly supply power to the neutral zone;
when both sides power supply arm all can't be for neutral region power supply, put into energy memory, directly provide the power supply for neutral region by energy memory.
In the neutral-section passing mode, the energy storage device mainly plays the roles of power supply supplement and standby. The power regulation subsystem is controlled, under the condition that the two power supply arms are normal and sufficient in power supply, the energy storage device is in a waiting isolation state, and power supply is performed for the neutral section only through the two power supply arms; when the power supply arm is short of power supply or the power supply input fault at one side of the device is cut off, the energy storage device is put into use to ensure that the over-phase separation function of the train is completed. Taking a left-side vehicle as an example, if a left-side power supply switch or a converter of the device fails, the QF1, the QF2, the QF5 and the QF6 are closed, a left-side power supply line of the device is cut off, and at the moment, if the right-side power supply can meet the power supply requirement of a neutral section, the disconnection state of the QF11 is continuously kept (namely, the energy storage device is not put into use), and the right-side line of the device is used for supplying power to the neutral section; and if the power supply on the right side cannot meet the power supply requirement of the neutral section, the QF11 is closed, the energy storage device is connected, and the power is supplied to the neutral section by cooperating with the right line of the device. When the power supply input at the two sides is cut off due to faults, the energy storage device is directly connected to supply power to the neutral section. The power of the energy storage device needs to meet the maximum output power of the long marshalling train, and the capacity of the energy storage device needs to meet the maximum power supply capacity needed when the long marshalling train passes through.
Under the mode of power quality management, the energy storage device mainly plays a role in power supply supplement and standby. Because energy memory can only export active power, consequently there is active not enough or one side power supply arm active not enough when power supply arm active power fuses, and when device opposite side power supply was amputated because of the trouble, input energy memory, for power supply arm compensation active power.
When the train is not close to the neutral zone, the electric energy quality control and the active power fusion of the two power supply arms are realized through the switch switching. Under the power fusion mode, due to the existence of the energy storage device, the capacity and the range of power regulation are greatly increased, and the regulation effect is better. When the energy feedback of the power supply network is detected, the excess energy can be absorbed and stored by the energy storage device in time, so that standby electric energy is provided for the split-phase passing mode and the power fusion mode, and the energy utilization rate of the railway power supply network is improved.
Under normal conditions, the power supply arms on two sides are used for supplying power to the neutral section, and even if the fault of a power supply line on one side of the device is cut off, the power supply of passing neutral sections of the train can be completed through the power supply line on the other side; even if the power supply of the power supply lines on the two sides of the device to the neutral section fails in the most serious fault, the temporary power supply of passing neutral sections of the train can be completed through the energy storage device.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. A flexible automatic passing neutral section system is characterized by comprising a train position identification subsystem, a power regulation subsystem and an energy storage device;
the train position identification subsystem is used for detecting whether a train arrives at a designated position on a track, detecting the running direction of the train and whether a track detection section is occupied, and transmitting a detection signal to the power regulation subsystem;
the power regulation subsystem is used for receiving the detection signal of the train position identification subsystem and realizing automatic passing phase of the train, power quality control and power fusion between two power supply arms according to the detection signal;
the energy storage device is used for absorbing regenerative braking energy of the power supply arms and is matched with the other phase power supply arm to jointly supply power to the neutral region when one phase power supply arm cannot supply power to the neutral region; or when the two-phase power supply arms can not supply power to the neutral area, the power is supplied to the neutral area;
the power regulation subsystem comprises a first power regulation loop, a second power regulation loop and a third power regulation loop; one end of each of the first power regulating circuit and the second power regulating circuit is connected with the neutral zone through a third power regulating circuit; and the other ends of the first power regulating circuit and the second power regulating circuit are respectively connected with the two-phase power supply arms.
2. The flexible automatic passing neutral section system of claim 1, wherein the first power regulating circuit comprises a disconnecting switch QS1, a circuit breaker QF1, an isolating transformer T1, a circuit breaker QF5, a converter 1# and a circuit breaker QF6 which are connected in series in sequence; the second power regulating circuit comprises an isolating switch QS2, a circuit breaker QF4, an isolating transformer T2, a circuit breaker QF8, a converter 2# and a circuit breaker QF7 which are sequentially connected in series; the third power regulating circuit comprises a breaker QF9, a converter 3# and a breaker QF10 which are sequentially connected in series and an isolation transformer T3.
3. A control method of a flexible automatic passing neutral section system according to any one of claims 1 to 2, comprising the steps of:
s01, monitoring whether power supply of the two-phase power supply arm is normal when the train passes through a neutral section in real time in the running process of the train;
s02, when one phase of power supply arm cannot supply power to the neutral area, the other phase of power supply arm supplies power to the neutral area; if the other phase of power supply arm can not meet the power supply requirement of the neutral zone, the energy storage device is put into use to cooperate with the other phase of power supply arm to jointly supply power to the neutral zone; when the power supply arms on the two sides can not supply power to the neutral zone, the energy storage device is put into use and directly supplies power to the neutral zone; when no train passes through neutral section and the power supply arm supplies power normally, the power quality between the two power supply arms is controlled and the power is fused through the power regulation subsystem.
4. A control method according to claim 3, characterized in that in step S02, the situation where the supply arm is unable to supply power to the neutral zone comprises a supply arm failure or/and a supply switch failure.
5. The control method of claim 3, wherein when there is no train passing split phase, detecting whether there is energy feedback on the power supply arm in real time; when energy is fed back, the energy storage device stores the fed back energy.
6. The control method according to claim 3, characterized in that the active, reactive and harmonic decomposition is carried out by collecting the voltage and current signals of the power supply bus to realize the power quality management.
7. The control method of any one of claims 3 to 6, wherein in passing the split phase, the power conditioning subsystem causes the neutral zone to be charged with a phase that is in phase with the one-sided supply arm power supply; when the train reaches the neutral zone, the phase shift control is carried out by taking the power supply phase of the power supply arm at the other side as a target, and the power supply phase shift is completed within fixed time, so that the power supply phase in the neutral zone is consistent with the power supply phase of the power supply arm at the other side.
8. The control method according to claim 7, wherein in the passing phase separation process, the voltage signal of the neutral zone is collected in real time, the power output is adjusted in real time, the output power changes along with the change of the locomotive power, and the maximum value meets the maximum output power of the train.
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| CN111361463B (en) * | 2020-03-02 | 2022-09-23 | 株洲中车时代电气股份有限公司 | Flexible bilateral power supply power flow control system of alternating current traction network |
| CN111319517B (en) * | 2020-03-04 | 2022-05-10 | 西南交通大学 | Method for detecting position of train pantograph in virtual in-phase power supply system |
| CN111267676B (en) * | 2020-03-11 | 2021-08-24 | 中车株洲电力机车研究所有限公司 | Train power supply network and traction system for automatic passing through neutral section of subarea thereof |
| CN112014675B (en) * | 2020-09-02 | 2023-08-29 | 中车大同电力机车有限公司 | Detection circuit and detection device of automatic passing neutral section system |
| CN112172618B (en) * | 2020-09-28 | 2022-06-07 | 郑州铁路职业技术学院 | High-reliability power supply method for electric locomotive |
| CN113183832B (en) * | 2021-05-18 | 2022-08-12 | 中铁二院工程集团有限责任公司 | Power balance cooperative flexible neutral section passing device for electrified railway and control method |
| CN113752922A (en) * | 2021-10-21 | 2021-12-07 | 株洲中车时代电气股份有限公司 | Flexible interconnected power supply system of electrified railway |
| CN114157163A (en) * | 2021-12-07 | 2022-03-08 | 西南交通大学 | Protection method of multi-station comprehensive renewable energy utilization system of heavy haul railway |
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