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CN111994128A - Grid-connected control method and system for auxiliary inverter of urban rail train - Google Patents

Grid-connected control method and system for auxiliary inverter of urban rail train Download PDF

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CN111994128A
CN111994128A CN202010832587.8A CN202010832587A CN111994128A CN 111994128 A CN111994128 A CN 111994128A CN 202010832587 A CN202010832587 A CN 202010832587A CN 111994128 A CN111994128 A CN 111994128A
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acu
starting
bus
signal
time
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CN111994128B (en
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尹龙龙
徐磊
李文正
王曙
李德祥
李然
唐化勇
张程
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CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
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CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L15/00—Indicators provided on the vehicle or train for signalling purposes
    • B61L15/0063—Multiple on-board control systems, e.g. "2 out of 3"-systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L15/00—Indicators provided on the vehicle or train for signalling purposes
    • B61L15/0081—On-board diagnosis or maintenance
    • 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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  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a grid-connected control method and a grid-connected control system for an auxiliary inverter of an urban rail train, wherein the method comprises the following steps: the TCMS sends a starting signal of the ACU to the ACU in a circulating mode according to the starting time T when the 1500V direct-current bus of the train is electrified; when a certain ACU detects that both 1500V direct current buses and 380V alternating current buses have electric signals in the starting time T, the ACU is started in the starting time T, the ACU is set as a main ACU, and meanwhile, the ACU sends out ACU bus activating signals to other ACUs; when a certain ACU detects that 1500V direct current bus has an electric signal and detects an ACU bus activation signal at the same time, starting time T is set at intervals0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU; the starting of all the ACUs of the train is completed in the mode. The invention can greatly shorten the starting time on the basis of ensuring the smooth starting of the ACU.

Description

Grid-connected control method and system for auxiliary inverter of urban rail train
Technical Field
The invention belongs to the technical field of rail transit, relates to an inverter control technology, and particularly relates to a grid-connected control method and system for an auxiliary inverter of an urban rail train.
Background
The design, debugging and application of the train tend to be intelligentized, informationized and automated more and more in combination with the development of the current rail transit industry, and the train needs to be additionally provided with more and more vehicle-mounted equipment to realize the functions. The newly added devices put forward a higher requirement on the power supply of the train, that is, in the design stage of the train, an Auxiliary inverter (ACU) needs to fully consider the influence of the newly added devices on the overall power supply condition of the train, and the main technical parameters include voltage, impact current, power and the like.
In the early development stage of rail transit, the quantity of equipment needing power supply in the train-mounted equipment is small, the power supply requirement of the whole train can be met by arranging two ACUs in each train, and the normal working mode is as follows: when the pantograph rises or the current collector is electrified, the high-voltage bus of the vehicle is electrified, the two ACUs are started simultaneously, and high voltage is inverted. However, with the increase of the number of the vehicle-mounted devices, especially the air conditioning system and the door system, the solution of providing two ACUs cannot meet the power supply requirement of the whole vehicle. According to the current conventional consist design, a six-consist vehicle is generally provided with four ACUs, and an eight-consist vehicle is provided with five ACUs, the settings being shown in table 1.
TABLE 1
Figure BDA0002638529710000011
Figure BDA0002638529710000021
Remarking:
Figure BDA0002638529710000022
representing the vehicle layout ACU.
If the train is an eight-marshalling train, according to a conventional ACU starting method, when a high-voltage bus of the train is electrified, five ACUs are started simultaneously, and because the output state of each ACU is unknown, the five ACUs are connected to the grid simultaneously, the problems of overlarge three-phase voltage difference value, inconsistent phase sequence, difference value backflow and the like between two or more ACUs can occur, so that the ACUs are not started successfully, the ACUs are burnt more seriously, and immeasurable economic loss is caused. To solve this problem, the following control method may be adopted: the ACUs need to be started at a polling interval, the starting time of a common ACU is 5 seconds, so that the starting time of each ACU is fixed to be 6 seconds, the starting condition of the ACU can be met, if the ACU is not started successfully within 6 seconds, the next ACU is polled to be started, and according to the normal condition, 5 ACUs of the whole train need to be started successfully within 30 seconds.
Although the method can ensure that ACUs are started successfully, the starting time of 30 seconds is too long, and the method is not applicable to leaving a driver from a garage for a short time, so that an effective ACU starting method is urgently needed, and the method not only ensures that 5 ACUs are started successfully, but also ensures that the time is fast.
Disclosure of Invention
The invention provides a grid-connected control method and system for an auxiliary inverter of an urban rail train, aiming at the problems of unsuccessful starting, long starting time and the like in the grid-connected control process of the conventional auxiliary inverter, and can solve the problem of grid-connected failure caused by overlarge three-phase voltage difference, inconsistent phase sequence and the like in the ACU grid-connected process and has short starting time.
In order to achieve the aim, the invention provides a grid-connected control method of an auxiliary inverter of an urban rail train, which comprises the following specific steps:
s1, the TCMS system detects that the 1500V direct current bus of the train is electrified, the TCMS system sends out a starting signal of the ACU according to the starting time T, and sends the starting signal of the ACU to N in a circulating mode, wherein N is more than or equal to 3 and less than or equal to 6 ACUs;
s2, the ith, i ═ 1, 2., where N ACUs detect that there is an electrical signal in the dc bus at 1500V within the start time T, and detect that there is an electrical signal in the ac bus at 380V at the same time, start the ACU within the start time T, set the ACU as the main ACU, and at the same time, the ACU sends out an ACU bus activation signal to other ACUs;
s3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has the electric signal, and simultaneously detects the ACU bus activation signal, then the start time T is separated0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s4, starting time T at interval0When the system is finished, the TCMS system sends a starting signal of the ACU to a second ACU behind an ith ACU according to the starting time T, the ACU detects that the 1500V direct current bus has an electric signal, and simultaneously detects an ACU bus activation signal, and then the system is started at the interval starting time T0Internally starting the ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s5, starting the rest N-3 ACUs in the mode of the step S4.
In order to achieve the purpose, the invention also provides a grid-connected control method of the urban rail train auxiliary inverter, which comprises the following steps:
s1, detecting that the whole train is divided into 2 sections or 3 sections of any section of direct current bus on 1500V direct current bus by N, N is more than or equal to 3 and less than or equal to 6 ACUs by the TCMS system, sending a starting signal of the ACUs by the TCMS system according to the starting time T, and sending the starting signal of the ACUs to the N ACUs in a circulating mode;
s2, the ith, i ═ 1, 2., where N ACUs detect that there is an electrical signal in the dc bus at 1500V within the start time T, and detect that there is an electrical signal in the ac bus at 380V at the same time, start the ACU within the start time T, set the ACU as the main ACU, and at the same time, the ACU sends out an ACU bus activation signal to other ACUs;
s3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has an electric signal, and simultaneously detects that the ACU bus is excitedActive signal, then at interval starting time T0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s4, starting time T at interval0When the system is finished, the TCMS system sends a starting signal of the ACU to a second ACU behind an ith ACU according to the starting time T, the ACU detects that the 1500V direct current bus has an electric signal, and simultaneously detects an ACU bus activation signal, and then the system is started at the interval starting time T0Internally starting the ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s5, starting the third to the N-1 ACUs after the ith ACU according to the mode of the step S4.
Preferably, if any ACU behind the ith ACU detects that a 1500V direct current bus has an electric signal, but does not detect that a 380V alternating current bus has an electric signal, the ACU sends an ACU master-slave signal to the rest of the non-started ACUs within the starting time T, and the ACU master-slave signal cancels the master identity of the ACU after the starting time T; if the ACU does not detect that the 1500V direct current bus has the electric signal, but detects that the 380V alternating current bus has the electric signal, the starting time T or the interval starting time T of the started ACU on the ACU0When the cycle is finished, the ACU is prohibited to be started, and the next cycle period is waited; if the ACU does not detect the electric signal of the 1500V direct current bus and does not detect the electric signal of the 380V alternating current bus, the starting time T or the interval starting time T of the started ACU on the ACU0At the end, the ACU is disabled from starting and waits for the next cycle period.
In order to achieve the above object, the present invention further provides an urban rail train auxiliary inverter grid-connected control system, including:
the direct current detection module is used for detecting whether a 1500V direct current bus of the train is electrified or not;
the TCMS is provided with an ACU starting signal module connected with the direct current detection module and used for sending an ACU starting signal according to the starting time T when detecting that a 1500V direct current bus of the train is electrified and sending the ACU starting signal to the ACU in a circulating mode;
the ACU starting module is arranged in the ACU, is respectively connected with the direct current detection module and the ACU starting signal module, and is used for starting the ACU when detecting that the 1500V direct current bus of the train is electrified and receiving a starting signal of the ACU;
the ACU bus activation module is arranged in the ACU, is connected with the ACU starting module and is used for sending an ACU bus activation signal to other ACUs after the ACU is started;
the interval starting module is arranged in the ACU, is connected with the direct current detection module and is used for starting time T at intervals when detecting that the 1500V direct current bus of the train is electrified and simultaneously detecting an ACU bus activation signal0，T0<ACU is started in T/2.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) the invention alternates a time sequence of interval starting time in fixed starting time, without considering the state of the AC bus contactor, can start smoothly when the ACUs meet the starting condition, and greatly shortens the starting time, the starting time of each ACU is calculated as 6s, the interval starting time is 1s, and the time for normally starting 5 ACUs is 30s by taking 5 ACUs as an example.
(2) The invention is based on a TCMS system, the TCMS system participates in the ACU grid-connected process in a full scale, the TCMS system continuously sends out the ACU starting signal in the vehicle-like operation process in a circulating mode in the whole ACU starting time sequence period, and the TCMS system only sends out the ACU starting signal in each starting period, and does not introduce the ACU starting signal and realize grid-connected signal into the control logic, namely, whether the ACU is really started or not is not considered, and the ACU starting safety is ensured.
(3) The invention can well protect the ACU from being damaged by short circuit through the short circuit detection control logic, greatly reduce economic loss and improve the availability and reliability of the system.
Drawings
FIG. 1 is a structural block diagram of an urban rail train auxiliary inverter grid-connected control system according to the invention;
fig. 2 is a power supply topology diagram of an ACU of a certain train project according to an embodiment of the present invention;
fig. 3 is a timing diagram of the ACU grid connection under a normal working condition of the ac bus contactor according to the embodiment of the present invention;
fig. 4 is a timing diagram of the ACU grid connection under the fault condition of the ac bus contactor according to the embodiment of the present invention.
In the figure, 1, a direct current detection module, 2, a TCMS system, 201, an ACU starting signal module, 3, an ACU, 301, an ACU starting module, 302, an ACU bus activating module, 303, an interval starting module, 4, alternating current bus contactors 1 and 5 and an alternating current bus contactor 2.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
The invention provides a grid-connected control method for an auxiliary inverter of an urban rail train, which comprises the following specific steps:
and S1, the TCMS system detects that the 1500V direct current bus of the train is electrified, the TCMS system sends out a starting signal of the ACUs according to the starting time T and sends the starting signal to N in a circulating mode, and N is more than or equal to 3 and less than or equal to 6 ACUs.
S2, the ith, i ═ 1, 2., N ACU detect that there is an electric signal in 1500V dc bus in the start time T, and detect that there is an electric signal in 380V ac bus at the same time, then start the ith ACU in the start time T, and the ith ACU sends out an ACU bus activation signal to other ACU at the same time.
S3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has the electric signal, and simultaneously detects the ACU bus activation signal, then the start time T is separated0，T0<And starting the ACU in T/2, and simultaneously sending an ACU bus bar activation signal to other ACUs by the ACU.
S4, starting time T at interval0At the end, TCMS isThe system sends out a starting signal of the ACU to a second ACU behind an ith ACU according to the starting time T, the ACU detects that a 1500V direct current bus has an electric signal, and simultaneously detects an ACU bus activation signal, and then the ACU starts the time T at intervals0，T0<And starting the ACU in T/2, and simultaneously sending an ACU bus bar activation signal to other ACUs by the ACU.
S5, starting the rest N-3 ACUs in the mode of the step S4.
In the control method, if any ACU does not detect the electric signal of the 1500V direct current bus within the starting time T, the ACU is prohibited to be started within the starting time T, and the next cycle period is waited. Specifically, in step S2, if the ith ACU does not detect the 1500V dc bus electrical signal, the ACU is prohibited from being started for the start time T, and the next cycle is waited. In step S3, if the first ACU after the ith ACU does not detect that the 1500V dc bus has the electrical signal, the ACU is prohibited from being started within the starting time T after the starting time T of the ith ACU, and waits for the next cycle period, and the rest of the process is repeated when other ACUs do not detect that the 1500V dc bus has the electrical signal.
In the control method, in order to shorten the starting time, the ACU which is started in one cycle sends an ACU bus activation signal to the TCMS system, and in the next cycle, the TCMS system sends the starting signal of the ACU according to the starting time T and only sends the starting signal to the ACU which is not started. Taking 5 ACUs in the whole train as an example, the ACU-1, the ACU-2, the ACU-3, the ACU-4 and the ACU-5 are respectively, if the ACU-1 and the ACU-3 are started in one cycle period, in the next cycle period, the TCMS system sends out a starting signal of the ACU according to the starting time T and only sends the starting signal to the ACU-2, the ACU-4 and the ACU-5, the cycle time can be reduced, and the starting time of the whole train for starting the 5 ACUs is further reduced.
Specifically, in the next cycle period, the TCMS system sends a start signal of the ACU to only the non-started ACU according to the start time T, and if a certain ACU detects an electrical signal of the 1500V dc bus and an electrical signal of the 380V ac bus within the start time T, the ACU is started within the start time T, and at the same time, the ACU sends an ACU bus activation signal to other non-started ACUs to start other non-started ACUs according to the steps S3 and S4.
In order to better protect the ACU from being damaged by a short circuit due to the risk of an internal short circuit and an external short circuit existing in the ACU during use, in a specific embodiment, in a normal starting process, if any one ACU reports an external short circuit signal, the TCMS system will report a time T after the external short circuit signal is reporteda，TaSending out ACU start signal in less than or equal to 2s to prohibit all ACU from starting, and maintaining time T for external short circuit signalb，TbDisconnecting the 380V alternating current bus after more than or equal to 5s and maintaining the disconnection time Tc，TcAfter the time is more than or equal to 2s, 380V alternating current is switched on to restart the ACU starting, and in the whole starting process, the ACU reporting the starting fault is prohibited to be started. Through the short circuit detection control logic, the ACU can be well protected from being damaged due to short circuit, economic loss is greatly reduced, and the availability and reliability of the grid connection of the ACU are improved.
The invention also provides a grid-connected control method of the urban rail train auxiliary inverter, which comprises the following steps:
s1, detecting that the whole train is divided into 2 sections or 3 sections of any section of direct current bus on 1500V direct current bus by N, N is more than or equal to 3 and less than or equal to 6 ACUs by the TCMS system, and sending a starting signal of the ACUs by the TCMS system according to the starting time T to the N ACUs in a circulating mode;
s2, the ith, i ═ 1, 2., where N ACUs detect that there is an electrical signal in the dc bus at 1500V within the start time T, and detect that there is an electrical signal in the ac bus at 380V at the same time, start the ACU within the start time T, set the ACU as the main ACU, and at the same time, the ACU sends out an ACU bus activation signal to other ACUs;
s3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has the electric signal, and simultaneously detects the ACU bus activation signal, then the start time T is separated0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s4, starting time T at interval0At the end, the TCMS systemSending a starting signal of the ACU to a second ACU behind the ith ACU according to the starting time T, detecting that the 1500V direct current bus has an electric signal by the ACU, and simultaneously detecting an ACU bus activation signal, and starting the ACU at the interval of the starting time T0Internally starting the ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s5, starting the rest N-3 ACUs in the mode of the step S4.
In the control method, if any ACU does not detect the electric signal of the 1500V direct current bus within the starting time T, the ACU is prohibited to be started within the starting time T, and the next cycle period is waited. Specifically, in step S2, if the ith ACU does not detect the 1500V dc bus electrical signal, the ACU is prohibited from being started for the start time T, and the next cycle is waited. In step S3, if the first ACU after the ith ACU does not detect that the 1500V dc bus has the electrical signal, the ACU is prohibited from being started within the starting time T after the starting time T of the ith ACU, and waits for the next cycle period, and the rest of the process is repeated when other ACUs do not detect that the 1500V dc bus has the electrical signal.
In the control method, if any ACU behind the ith ACU detects that a 1500V direct current bus has an electric signal but does not detect an ACU bus activation signal, the ACU is started within the starting time T, the ACU is set as a main ACU, meanwhile, the ACU sends an ACU bus activation signal to other ACUs, and under normal conditions, other ACUs can receive the bus activation signal sent by the ACU which is successfully started (the signal indicates that the ACU is successfully started), and then the other ACUs are started according to the slave mode; if the ACU does not detect the electric signal of the 1500V direct current bus but detects the ACU bus activation signal, the starting time T or the interval starting time T of the ACU which is started on the ACU0When the cycle is finished, the ACU is prohibited to be started, and the next cycle period is waited; if the ACU does not detect the electric signal of the 1500V direct current bus and does not detect the ACU bus activation signal, the starting time T or the interval starting time T of the ACU which is started on the ACU0At the end, the ACU is disabled from starting and waits for the next cycle period.
Specifically, when the started ACU is the master ACU, the master identity thereof is cancelled after the start time T. The main identity of the ACU is cancelled after the starting time, so that the problem that other ACUs receive ACU bus activation signal information for a long time to generate misjudgment is avoided, and protection is made to prevent the ACUs from being started normally.
In order to better protect the ACU from being damaged by a short circuit due to the risk of an internal short circuit and an external short circuit existing in the ACU during use, in a specific embodiment, in a normal starting process, if any one ACU reports an external short circuit signal, the TCMS system will report a time T after the external short circuit signal is reporteda，TaSending out ACU start signal in less than or equal to 2s to prohibit all ACU from starting, and maintaining time T for external short circuit signalb，TbDisconnecting the 380V alternating current bus after more than or equal to 5s and maintaining the disconnection time Tc，TcAnd after the time is more than or equal to 2s, the 380V alternating current is switched on to restart the ACU starting, and in the whole starting process, the ACU reporting the starting fault is prohibited to be started. Through the short circuit detection control logic, the ACU can be well protected from being damaged due to short circuit, economic loss is greatly reduced, and the availability and reliability of the grid connection of the ACU are improved.
In the control method, in order to shorten the starting time, the ACU which is started in one cycle sends an ACU bus activation signal to the TCMS system, and in the next cycle, the TCMS system sends the starting signal of the ACU according to the starting time T and only sends the starting signal to the ACU which is not started. Taking 5 ACUs in the whole train as an example, the ACU-1, the ACU-2, the ACU-3, the ACU-4 and the ACU-5 are respectively, if the ACU-1 and the ACU-3 are started in one cycle period, in the next cycle period, the TCMS system sends out a starting signal of the ACU according to the starting time T and only sends the starting signal to the ACU-2, the ACU-4 and the ACU-5, the cycle time can be reduced, and the starting time of the whole train for starting the 5 ACUs is further reduced.
Specifically, in the next cycle period, the TCMS system sends a start signal of the ACU to only the non-started ACU according to the start time T, and if a certain ACU detects an electrical signal of the 1500V dc bus and an electrical signal of the 380V ac bus within the start time T, the ACU is started within the start time T, and at the same time, the ACU sends an ACU bus activation signal to other non-started ACUs to start other non-started ACUs according to the steps S3 and S4.
Referring to fig. 1, the invention also provides an urban rail train auxiliary inverter grid-connected control system, which comprises:
the direct current detection module 1 is used for detecting whether a 1500V direct current bus of the train is electrified or not;
the TCMS system 2 is provided with an ACU starting signal module 201 connected with the direct current detection module 1, and is used for sending an ACU starting signal according to the starting time T when detecting that a 1500V direct current bus of the train is electrified, and sending the ACU starting signal to the ACU in a circulating mode;
the ACU starting module 301 is arranged in the ACU3, is respectively connected with the direct current detection module and the ACU starting signal module, and is used for starting the ACU when detecting that the 1500V direct current bus of the train is electrified and receiving a starting signal of the ACU;
the ACU bus activation module 302 is arranged in the ACU3, is connected with the ACU starting module, and is used for sending an ACU bus activation signal to other ACUs after the ACU is started;
the interval starting module 303 is arranged in the ACU3, is connected with the direct current detection module 1, and is used for starting time T at intervals when detecting that the direct current bus of the train 1500V is electrified and detecting an ACU bus activation signal at the same time0，T0<ACU is started in T/2.
In order to clearly illustrate the above control method and apparatus, the following detailed description is made with reference to specific embodiments.
Example (b): fig. 2 shows an ACU power supply topology of a train project, in which three pantographs are connected to a 1500V dc bus, and includes 5 auxiliary inverters ACU, and a 380V ac bus has two ac bus contactors divided into three sections, wherein pantograph 1 is connected to auxiliary inverter ACU-1 and auxiliary inverter ACU-2, pantograph 2 is connected to auxiliary inverter ACU-3, pantograph 3 is connected to auxiliary inverter ACU-4 and auxiliary inverter ACU-5, ac bus contactor 1 is disposed on the 380V ac bus between auxiliary inverter ACU-2 and auxiliary inverter ACU-3, and ac contactor 2 is disposed on the 380V ac bus between auxiliary inverter ACU-3 and auxiliary inverter ACU-4.
When controlling the grid connection, the starting time is set to be 6s, and the interval starting time is set to be 1 s.
The starting process of the first cycle period of the train ACU is as follows:
and S1, detecting that any one section of direct current bus on the 1500V direct current bus of the 3 sections of the whole train is electrified by the TCMS system, and sending a starting signal of the ACU to the ACU-1, the ACU-2, the ACU-3, the ACU-4 and the ACU-5 by the TCMS system according to the starting time T in a circulating mode. Specifically, in a cycle period, the first 6s of the TCMS system sends an ACU activation signal to ACU-1, the second 6s sends an ACU activation signal to ACU-2, the third 6s sends an ACU activation signal to ACU-3, the fourth 6s sends an ACU activation signal to ACU-4, and the 5 th 6s sends an ACU activation signal to ACU-5.
S2, ACU-1 start control
If the ACU-1 detects that 1500V direct current buses have electric signals in the first 6s and 380V alternating current buses have electric signals at the same time, the ACU-1 is started in the first 6s, the ACU-1 is set as a main ACU, the ACU-1 sends ACU bus activation signals to the ACU-2, the ACU-3, the ACU-4 and the ACU-5 at the same time, and the ACU-1 main identity is cancelled when the first 6s is finished.
If the ACU-1 does not detect the 1500V direct current bus electrical signal in the first 6s, the ACU-1 is prohibited from starting in 6s and waits for the next period.
S3, ACU-2 Start control
At the end of the first 6s of ACU-1, the TCMS system signals the ACU's activation to ACU-2 according to the second 6 s.
If the ACU-2 detects that the 1500V direct current bus has an electric signal and simultaneously detects an ACU bus activation signal, the ACU-2 is started in the first 1s, and simultaneously the ACU-2 sends the ACU bus activation signal to the ACU-3, the ACU-4, the ACU-5 and the ACU-1.
And if the ACU-2 detects that the 1500V direct current bus has an electric signal but does not detect the ACU bus activation signal, starting the ACU-2 in the second 6s, setting the ACU-2 as a main ACU, and canceling the ACU-2 main identity when the second 6s is finished.
And if the ACU-2 does not detect the 1500V direct current bus electrical signal in the second 6s, but detects the ACU bus activation signal, the ACU bus activation signal is prohibited from being started after the first 6s, and the next period is waited.
And if the ACU-2 does not detect the electric signal of the 1500V direct current bus in the second 6s and does not detect the ACU bus activation signal, the ACU-2 is prohibited from starting after the first 6s, and waits for the next period.
S4, ACU-3 Start control
At the end of the second 6s or first 1s of ACU-2, the TCMS system signals ACU activation to ACU-3 according to the third 6 s.
If the ACU-3 detects that the 1500V direct current bus has an electric signal and simultaneously detects an ACU bus activation signal, the ACU-3 is started in the second 1s, and simultaneously the ACU-3 sends the ACU bus activation signal to the ACU-4, the ACU-5, the ACU-1 and the ACU-2.
And if the ACU-3 detects that the 1500V direct current bus has an electric signal but does not detect the ACU bus activation signal, starting the ACU-3 in the third 6s, setting the ACU-3 as a main ACU, and canceling the ACU-3 main identity when the third 6s is finished.
And if the ACU-3 does not detect the 1500V direct current bus electrical signal in the third 6s but detects the ACU bus activation signal, the ACU bus activation signal is prohibited to start after the second 6s or the first 1s, and the next period is waited.
And if the ACU-3 does not detect the electric signal of the 1500V direct current bus in the third 6s and does not detect the ACU bus activation signal, the ACU-3 is prohibited from starting after the second 6s or the first 1s, and waits for the next period.
S5, ACU-4 start control
At the end of the third 6s or second 1s of ACU-3, the TCMS system signals ACU activation to ACU-4 according to the fourth 6 s.
If the ACU-4 detects that the 1500V direct current bus has an electric signal and simultaneously detects an ACU bus activation signal, the ACU-4 is started in the third 1s, and simultaneously the ACU-4 sends the ACU bus activation signal to the ACU-5, the ACU-1, the ACU-2 and the ACU-3.
And if the ACU-4 detects that the 1500V direct current bus has an electric signal but does not detect the ACU bus activation signal, starting the ACU-4 in the fourth 6s, setting the ACU-4 as a main ACU, and canceling the ACU-4 main identity when the fourth 6s is finished.
And if the ACU-4 does not detect the 1500V direct current bus electrical signal in the fourth 6s but detects the ACU bus activation signal, the ACU bus activation signal is prohibited from being started after the third 6s or the second 1s, and the next period is waited.
And if the ACU-4 does not detect the electric signal of the 1500V direct current bus in the fourth 6s and does not detect the ACU bus activation signal, the ACU-4 is prohibited from starting after the third 6s or the second 1s, and waits for the next period.
ACU-5 Start control
At the end of the fourth 6s or third 1s of ACU-4, the TCMS system signals the ACU to ACU-5 for the fifth 6 s.
If the ACU-5 detects that the 1500V direct current bus has an electric signal and simultaneously detects an ACU bus activation signal, the ACU-5 is started in the fourth 1s, and simultaneously the ACU-5 sends the ACU bus activation signal to the ACU-1, the ACU-2, the ACU-3 and the ACU-4.
And if the ACU-5 detects that the 1500V direct current bus has an electric signal but does not detect the ACU bus activation signal, starting the ACU-5 in the fifth 6s, setting the ACU-5 as the main ACU, and canceling the ACU-5 main identity when the fifth 6s is finished.
And if the ACU-5 does not detect the 1500V direct current bus electrical signal in the fifth 6s but detects the ACU bus activation signal, the ACU bus activation signal is prohibited from being started after the fourth 6s or the third 1s, and the next period is waited.
And if the ACU-5 does not detect the electric signal of the 1500V direct current bus in the fifth 6s and does not detect the ACU bus activation signal, the ACU-5 is prohibited from starting after the fourth 6s or the third 1s, and waits for the next period.
The timing sequence of the ac bus contactor 1 and the ac bus contactor 2 when they are connected to the ac grid under the normal and fully closed condition is shown in fig. 3. As can be seen from FIG. 3, under normal operating conditions, 5 ACUs can complete the whole startup within 10s, which greatly shortens the startup time compared with the prior control method in which 30s is required for the whole startup group of 5 ACUs.
The time sequence of the ACU grid connection under the working condition that the AC bus contactor 1 and the AC bus contactor 2 are all disconnected in fault is shown in figure 4. As can be seen from FIG. 4, under the fault condition, 5 ACUs can complete the whole startup within 20s, and compared with the prior control method that the whole startup group of 5 ACUs needs 30s, the startup time is also greatly shortened.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are possible within the spirit and scope of the claims.

Claims (14)

1. The grid-connected control method for the auxiliary inverter of the urban rail train is characterized by comprising the following steps of:
s1, the TCMS system detects that a 1500V direct current bus of the train is electrified, the TCMS system sends out a starting signal of the ACU according to the starting time T, and sends the starting signal of the ACU to N in a circulating mode, wherein N is more than or equal to 3 and less than or equal to 6 ACUs;
s2, the ith, i ═ 1, 2., where N ACUs detect that there is an electrical signal in the dc bus at 1500V within the start time T, and detect that there is an electrical signal in the ac bus at 380V at the same time, start the ACU within the start time T, set the ACU as the main ACU, and at the same time, the ACU sends out an ACU bus activation signal to other ACUs;
s3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has the electric signal, and simultaneously detects the ACU bus activation signal, then the start time T is separated0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s4, starting time T at interval0When the system is finished, the TCMS system sends a starting signal of the ACU to a second ACU behind an ith ACU according to the starting time T, the ACU detects that the 1500V direct current bus has an electric signal, and simultaneously detects an ACU bus activation signal, and then the system is started at the interval starting time T0Internally starting the ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s5, starting N-3 ACUs according to the mode of the step S4.
2. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 1, wherein if any ACU does not detect an electric signal of the 1500V direct current bus within the starting time T, the ACU is prohibited from being started within the starting time T, and the next cycle period is waited.
3. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 1, wherein the ACU which is started in one cycle sends an ACU bus activation signal to the TCMS system, and in the next cycle, the TCMS system sends a starting signal of the ACU according to the starting time T and only sends the starting signal to the ACU which is not started.
4. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 3, wherein in the next cycle period, the TCMS system sends out a start signal of the ACU according to the start time T and only sends the ACU to the non-started ACU, if a certain ACU detects 1500V DC bus electric signals in the start time T and 380V AC bus electric signals at the same time, the ACU is started in the start time T, and simultaneously sends out ACU bus activation signals to other non-started ACUs and starts other non-started ACUs according to the manners of steps S3 and S4.
5. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 4, wherein when the started ACU is a main ACU, the main identity of the started ACU is cancelled after the starting time T.
6. The grid-connected control method for the auxiliary inverter of the urban rail train according to any one of claims 1 to 5, characterized in that in the normal starting process, if any one ACU reports an external short circuit signal, the TCMS system will report the time T after the external short circuit signal is reporteda，TaSending out ACU start signal in less than or equal to 2s to prohibit all ACU from starting, and maintaining time T for external short circuit signalb，TbDisconnecting the 380V alternating current bus after more than or equal to 5s and maintaining the disconnection time Tc，TcAfter the time is more than or equal to 2s, 380V alternating current is switched on to restart the ACU starting, and in the whole starting process, the ACU reporting the starting fault is prohibited to be started.
7. The grid-connected control method for the auxiliary inverter of the urban rail train is characterized by comprising the following steps of:
s1, detecting that the whole train is divided into 2 sections or 3 sections of any section of direct current bus on 1500V direct current bus by N, N is more than or equal to 3 and less than or equal to 6 ACUs by the TCMS system, sending a starting signal of the ACUs by the TCMS system according to the starting time T, and sending the starting signal of the ACUs to the N ACUs in a circulating mode;
s2, the ith, i ═ 1, 2., where N ACUs detect that there is an electrical signal in the dc bus at 1500V within the start time T, and detect that there is an electrical signal in the ac bus at 380V at the same time, start the ACU within the start time T, set the ACU as the main ACU, and at the same time, the ACU sends out an ACU bus activation signal to other ACUs;
s3, when the start time T of the ith ACU is over, the TCMS system sends the start signal of the ACU to the first ACU behind the ith ACU according to the start time T, the ACU detects that the 1500V direct current bus has the electric signal, and simultaneously detects the ACU bus activation signal, then the start time T is separated0，T0<Starting the ACU in T/2, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s4, starting time T at interval0When the system is finished, the TCMS system sends a starting signal of the ACU to a second ACU behind an ith ACU according to the starting time T, the ACU detects that the 1500V direct current bus has an electric signal, and simultaneously detects an ACU bus activation signal, and then the system is started at the interval starting time T0Internally starting the ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU;
s5, starting the rest N-3 ACUs in the mode of the step S4.
8. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 7, wherein if any ACU does not detect an electric signal of the 1500V DC bus within the starting time T, the ACU is prohibited from being started within the starting time T, and the next cycle is waited.
9. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 8, wherein if any ACU after the ith ACU is connected to the grid-connected control device, the ACU is connected to the grid-connected control deviceWhen detecting that the 1500V direct current bus has an electric signal but not detecting an ACU bus activation signal, starting the ACU within the starting time T, setting the ACU as a main ACU, and simultaneously sending an ACU bus activation signal to other ACUs by the ACU; if the ACU does not detect the electric signal of the 1500V direct current bus but detects the ACU bus activation signal, the starting time T or the interval starting time T of the ACU which is started on the ACU0When the cycle is finished, the ACU is prohibited to be started, and the next cycle period is waited; if the ACU does not detect the electric signal of the 1500V direct current bus and does not detect the ACU bus activation signal, the starting time T or the interval starting time T of the ACU which is started on the ACU0At the end, the ACU is disabled from starting and waits for the next cycle period.
10. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 9, wherein when the started ACU is a master ACU, the master identity of the started ACU is cancelled after the starting time T.
11. The grid-connected control method for the auxiliary inverter of the urban rail train according to any one of claims 7 to 10, wherein in the normal starting process, if any one of the ACUs reports an external short-circuit signal, the TCMS system will report the time T after the external short-circuit signal is reporteda，TaSending out ACU start signal in less than or equal to 2s to prohibit all ACU from starting, and maintaining time T for external short circuit signalb，TbDisconnecting the 380V alternating current bus after more than or equal to 5s and maintaining the disconnection time Tc，TcAnd after the time is more than or equal to 2s, the 380V alternating current is switched on to restart the ACU starting, and in the whole starting process, the ACU reporting the starting fault is prohibited to be started.
12. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in any one of claims 7 to 10, wherein an ACU which has been started in one cycle sends an ACU bus activation signal to the TCMS system, and in the next cycle, the TCMS system sends a start signal of the ACU according to the start time T and only sends the ACU to an un-started ACU.
13. The grid-connected control method for the auxiliary inverter of the urban rail train as claimed in claim 12, wherein in the next cycle period, the TCMS system sends out a start signal of the ACU according to the start time T to only the non-started ACU, if a certain ACU detects 1500V dc bus electrical signals during the start time T and 380V ac bus electrical signals simultaneously, the ACU is started during the start time T, and at the same time, the ACU sends out an ACU bus activation signal to other non-started ACUs, and other non-started ACUs are started according to the steps S3 and S4.
14. The utility model provides a city rail train auxiliary inverter grid-connected control system which characterized in that includes:
the direct current detection module is used for detecting whether a 1500V direct current bus of the train is electrified or not;
the TCMS is provided with an ACU starting signal module connected with the direct current detection module and used for sending an ACU starting signal according to the starting time T when detecting that a 1500V direct current bus of the train is electrified and sending the ACU starting signal to the ACU in a circulating mode;
the ACU starting module is arranged in the ACU, is respectively connected with the direct current detection module and the ACU starting signal module, and is used for starting the ACU when detecting that the 1500V direct current bus of the train is electrified and receiving a starting signal of the ACU;
the ACU bus activation module is arranged in the ACU, is connected with the ACU starting module and is used for sending an ACU bus activation signal to other ACUs after the ACU is started;
the interval starting module is arranged in the ACU, is connected with the direct current detection module and is used for starting time T at intervals when detecting that the 1500V direct current bus of the train is electrified and simultaneously detecting an ACU bus activation signal0，T0<ACU is started in T/2.
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