CN107742879B - Control method of rail potential limiting device of urban rail transit power supply system - Google Patents
Control method of rail potential limiting device of urban rail transit power supply system Download PDFInfo
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- CN107742879B CN107742879B CN201711154829.7A CN201711154829A CN107742879B CN 107742879 B CN107742879 B CN 107742879B CN 201711154829 A CN201711154829 A CN 201711154829A CN 107742879 B CN107742879 B CN 107742879B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 rail potential limiting device and a control method of an urban rail transit power supply system, wherein the rail potential limiting device comprises a PLC control system, a trigger circuit and a voltage monitoring circuit which are all connected with the PLC control system; the trigger circuit is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor arranged between the steel rail and the ground; the two ends of the contactor are connected with overvoltage suppression modules in parallel; the overvoltage suppression module is connected with the PLC control system; the filter module is connected with the PLC control system; the invention reduces the action times and misoperation of the rail potential limiting device, avoids the traction reflux from flowing into the ground for a long time, reduces the harm of stray current, and meets the actual requirements of rapid development and large-scale opening operation of the current urban rail transit.
Description
Technical Field
The invention relates to a steel rail potential limiting device, in particular to a control method of a steel rail potential limiting device of an urban rail transit power supply system.
Background
In the current urban rail transit traction power supply system, a steel rail provides a passage for current flowing through a locomotive to return to the negative electrode of a traction substation; due to the influence of the self-impedance characteristic of the steel rail and stray current, a higher potential difference, namely the steel rail potential, can be generated between the steel rail and the ground in the running process of the locomotive; in order to prevent the rail from damaging the person possibly caused by too high ground potential, rail potential limiting devices (Over-Voltage Protection Device, OVPD) are arranged in each station and parking lot; the device is used for monitoring the voltage between the steel rail and the ground, and when the potential of the steel rail is too high, the steel rail is grounded to play a role in limiting the potential of the steel rail; the personal safety of staff and platform passengers is ensured; the frequent action of the rail potential limiting device causes part of traction reflux current to leak into the ground through the OVPD, so that stray current is formed, equipment and buildings such as buried metal pipelines, concrete reinforcing structures near subways, subway facilities and the like are corroded, and serious consequences can be caused by long-term corrosion.
The actual backflow current flowing through the steel rail fluctuates severely, and the current direction also changes frequently due to the moment change of the locomotive position and the change of the running state in the traction power supply system, so that the backflow current becomes a transient time-varying variable with certain alternating current characteristics; therefore, the alternating current component in the reflux current is an important influencing factor for the potential of the steel rail to be too high; in addition, the misoperation of the device is frequently caused by the operation overvoltage generated in the action process of the contactor in the steel rail potential limiting device (for example, the misoperation of a protection second section and even a third section caused by the protection first section of action); the contactor is locked, and the reflux current in the steel rail directly flows into the ground for a long time, so that the damage of stray current is aggravated; therefore, a certain technical measure is necessary to perfect the existing steel rail potential limiting device and control method, the alternating current component contained in the steel rail reflux current is reduced, overvoltage generated in the switching-on and switching-off processes of the contactor is reduced, and the harm of stray current is further reduced.
Disclosure of Invention
The invention provides a control method of a rail potential limiting device of an urban rail transit power supply system, which reduces rail potential and stray current.
The invention relates to a control method of a rail potential limiting device of an urban rail transit power supply system, which comprises a PLC control system, a trigger circuit and a voltage monitoring circuit, wherein the trigger circuit and the voltage monitoring circuit are connected with the PLC control system; the trigger circuit is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor arranged between the steel rail and the ground; the two ends of the contactor are connected with overvoltage suppression modules in parallel; the overvoltage suppression module is connected with the PLC control system; the filter module is connected with the PLC control system; the filtering module comprises a filtering communication module, a filtering controller and an alternating current component detection module which are sequentially connected; the filter control switch and the filter are connected with the filter controller; the filter control switch is connected with the filter; the filtering communication module is connected with the PLC control system. The method comprises the following steps:
step 1: monitoring and acquiring current and potential data of a steel rail in real time;
step 2: judging whether the monitored rail potential reaches or exceeds a set value U 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if yes, judging the state of the filtering module; if the filter module is in the input state, the step 3 is carried out; if the filtering module is in an uninjected state, the PLC control system sends out an instruction to control the input of the filtering module, and sets input parameters; simultaneously feeding back to the PLC control system and returning to the step 1;
step 3: the PLC control system judges whether the contactor needs to be switched on or switched off according to a preset protection strategy; if not, after the interval T1, the PLC control system sends out a filtering module cutting command and feeds back a result; returning to the step 1; judging the state of the overvoltage suppression module if the overvoltage suppression module is needed; if the overvoltage suppression module is put into operation, the step 4 is shifted to; if the overvoltage suppression module is not put into operation, the PLC control system sends out an instruction to control the overvoltage suppression module to be put into operation; the overvoltage suppression module feeds back the state of the overvoltage suppression module to the PLC control system; turning to step 4;
step 4: the PLC control system sends a contactor switching-on or switching-off instruction; after the interval T2, the PLC control system sends out an instruction to cut off the overvoltage suppression module; the overvoltage suppression module feeds back the working state of the overvoltage suppression module to the PLC control system.
The invention relates to a control method of a rail potential limiting device of an urban rail transit power supply system, which comprises a PLC control system, a trigger circuit and a voltage monitoring circuit, wherein the trigger circuit and the voltage monitoring circuit are connected with the PLC control system; the trigger circuit is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor arranged between the steel rail and the ground; the two ends of the contactor are connected with overvoltage suppression modules in parallel; the overvoltage suppression module is connected with the PLC control system; the filter module is connected with the PLC control system; the filtering module comprises a filtering communication module, a filtering controller and an alternating current component detection module which are sequentially connected; the filter control switch and the filter are connected with the filter controller; the filter control switch is connected with the filter; the filtering communication module is connected with the PLC control system; the overvoltage suppression module comprises an overvoltage suppression communication module, an overvoltage suppression controller, an overvoltage suppression control switch and an overvoltage suppression circuit which are connected in sequence. The method comprises the following steps:
step 1: monitoring and acquiring current and potential data of a steel rail in real time;
step 2: judging whether the monitored rail potential reaches or exceeds a set value U 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if yes, judging the state of the filter, if the filter is in an unexpended state, sending steel rail current data and a filter input control instruction to a filter controller by a PLC control system through a filter communication module; the filter controller controls the alternating current component detection module to complete alternating current component detection and feeds the frequency spectrum back to the filter controller; the filter controller sets filter parameters according to feedback data of the alternating current component detection module, controls a filter control switch to be closed, and inputs the filter; meanwhile, the filter controller feeds back the state and parameters of the filter to the PLC control system through the filter communication module;
step 3: if the filter state is judged to be the input state in the step 2, the PLC control system judges whether the contactor needs to be switched on or switched off according to a preset protection strategy; if not, after the interval T1, the PLC control system sends an instruction for cutting off the filter to the filter controller; the filter controller controls the filter to control the switch to be closed, and feeds back a result to the PLC control system; returning to the step 1;
step 4: if the contactor is judged to be in need of closing or opening in the step 3; the PLC control system judges the state of the overvoltage suppression module according to a preset protection strategy; if the overvoltage suppression module is in the input state, the PLC control system controls the contactor to be switched on or switched off; turning to step 6;
step 5: if the overvoltage suppression module is in an uninjected state in the step 4; the PLC control system sends data and input instructions to the overvoltage suppression controller through the overvoltage suppression communication module; the overvoltage suppression controller controls the overvoltage suppression control switch to be closed, and the overvoltage suppression circuit is put into the overvoltage suppression circuit; the overvoltage suppression controller feeds back the input state of the overvoltage suppression circuit to the PLC control system through the overvoltage suppression communication module; the PLC control system sends a contactor switching-on or switching-off instruction; turning to step 6;
step 6: after the interval T2, the PLC control system sends an instruction to the overvoltage suppression controller to cut off the overvoltage suppression circuit; the overvoltage suppression circuit feeds back the working state of the overvoltage suppression circuit to the PLC control system.
Further, the filter is one of a direct current filter and a band-stop filter.
Further, the overvoltage suppression circuit is an RC overvoltage suppression circuit.
Further, the filter module is arranged between the steel rail and the ground.
The beneficial effects of the invention are as follows:
(1) The invention is provided with the filtering module, which can filter the alternating current component in the steel rail reflux current, reduce the steel rail potential and reduce the action times of the steel rail potential limiting device;
(2) The overvoltage suppression circuit is arranged, so that the operation overvoltage generated by the action of the contactor can be suppressed, the misoperation of the device protection caused by the overvoltage is prevented, the damage caused by the overvoltage and the overcurrent in the switching process of the contactor is reduced, and the service life of the device is prolonged;
(3) The invention can reduce the action times and misoperation of the rail potential limiting device, avoid the traction reflux from flowing into the ground for a long time, reduce the harm of stray current and meet the actual requirements of rapid development and large-scale opening operation of the current urban rail transit.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic structural diagram of a filtering module and an overvoltage suppression module according to the present invention.
FIG. 3 is a flow chart of a control method of the present invention.
Fig. 4 is backflow test data of a traction substation of an urban rail transit power supply system according to an embodiment of the invention.
Fig. 5 is actual measurement data of the overvoltage at both ends of the contactor during the protection operation of the present invention.
Fig. 6 is a simulation result of the operation overvoltage across the contactor when the overvoltage suppression module is not employed.
Fig. 7 is a simulation result of the operation overvoltage at both ends of the contactor in the embodiment of the invention.
Detailed Description
The invention will be further described with reference to the drawings and specific examples.
As shown in fig. 1-2, the rail potential limiting device of the urban rail transit power supply system comprises a PLC control system 4, a trigger circuit 6 and a voltage monitoring circuit 3 which are all connected with the PLC control system; the trigger circuit 6 is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor 5 arranged between the steel rail and the ground; the two ends of the contactor 5 are connected with overvoltage suppression modules 2 in parallel; the overvoltage suppression module 2 is connected with the PLC control system 4; the device also comprises a filtering module 1 connected with the PLC control system 4; the filtering module 1 comprises a filtering communication module 1-1, a filtering controller 1-2 and an alternating current component detection module 1-3 which are sequentially connected; the filter control device also comprises a filter control switch 1-4 and a filter 1-5 which are connected with the filter controller 1-2; the filter control switch 1-4 is connected with the filter 1-5; the filtering communication module 1-1 is connected with the PLC control system 4; the overvoltage suppression module 2 comprises an overvoltage suppression communication module 2-1, an overvoltage suppression controller 2-2, an overvoltage suppression control switch 2-3 and an overvoltage suppression circuit 2-4 which are connected in sequence; the filter 1-5 is one of a direct current filter and a band elimination filter; the overvoltage suppression circuit 2-4 is an RC overvoltage suppression circuit; the filter module 1 is arranged between the steel rail and the ground, and is arranged in the existing steel rail potential limiting device or along the line; the PLC control system 4 is also connected to a device operating status display 7.
When the intelligent control system is used, the filter controller 1-2 receives real-time rail potential, rail current and a filter 1-5 switching instruction sent by the PLC control system 4 through the filter communication module 1-1, and sends state feedback information of the filter 1-5 to the PLC control system 4; the filter controller 1-2 sends steel rail backflow data to the alternating current component detection module 1-3, controls the steel rail backflow data to finish alternating current component detection and feeds back the detected alternating current component frequency spectrum to the filter controller 1-2; the filter controller 1-2 can set the filter parameters of the filter 1-5 according to the frequency spectrum of the alternating current component; the filter controller 1-2 sends the filter parameters of the filter 1-5 to the filter control switch 1-4; the filter controller 1-2 sends a filter 1-5 throwing or cutting instruction to the filter control switch 1-4 to control throwing or cutting of the filter 1-5 between the steel rail and the ground; the overvoltage suppression modules 2 are arranged at two ends of the contactor 5 in parallel and are put into operation before the contactor 5 acts; the overvoltage suppression controller 2-2 receives an overvoltage suppression module switching instruction sent by the PLC control system 4 through the overvoltage suppression communication module 2-1, and sends state feedback information of the overvoltage suppression module 2 to the PLC control system; the overvoltage suppression controller 2-2 sends an input or cut-off command of the overvoltage suppression circuit 2-4 to the overvoltage suppression control switch 2-3, and the overvoltage suppression control switch 2-3 controls the input or cut-off of the overvoltage suppression circuit 2-4 after receiving the operation command.
A control method of a rail potential limiting device of an urban rail transit power supply system comprises the following steps:
step 1: monitoring and acquiring current and potential data of a steel rail in real time;
step 2: judging whether the monitored rail potential reaches or exceeds a set value U 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if yes, judging the state of the filtering module 1; if the filter module 1 is in the input state, the step 3 is carried out; if the filter module 1 is in an uninjected state, the PLC control system 4 sends out an instruction to control the input of the filter module and sets input parameters; meanwhile, the feedback is sent back to the PLC control system 4, and the step 1 is returned;
step 3: the PLC control system 4 judges whether the contactor 5 needs to be switched on or switched off according to a preset protection strategy; if not, after the interval T1, the PLC control system 4 sends out a command for cutting off the filter module 1 and feeds back the result; returning to the step 1; judging the state of the overvoltage suppression module 2 if necessary; if the overvoltage suppression module 2 is put into operation, the step 4 is shifted to; if the overvoltage suppression module 2 is not put into operation, the PLC control system 4 sends out an instruction to control the overvoltage suppression module 2 to be put into operation; the overvoltage suppression module (2) feeds back the state of the overvoltage suppression module to the PLC control system 4; turning to step 4;
step 4: the PLC control system 4 sends a closing or opening instruction of the contactor 5; after the interval T2, the PLC control system 4 sends out an instruction to cut off the overvoltage suppression module 2; the overvoltage suppression module 2 feeds back its operating state to the PLC control system 4.
As shown in fig. 3, a control method of a rail potential limiting device of an urban rail transit power supply system comprises the following steps:
step 1: monitoring and acquiring current and potential data of a steel rail in real time; acquiring steel rail current data from a traction substation negative electrode cabinet (or a reflux tank), acquiring steel rail potential data through a voltage monitoring circuit 3, and realizing real-time updating of the data;
step 2: judging whether the monitored rail potential reaches or exceeds a set value U 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if yes, judging the state of the filter 1-5, if the filter 1-5 is in an unexpended state, sending steel rail current data and an input control instruction of the filter 1-5 to the filter controller 1-2 by the PLC control system 4 through the filter communication module 1-1; the filter controller 1-2 controls the alternating current component detection module 1-3 to finish alternating current component detection and feeds back the detected alternating current component frequency spectrum to the filter controller 1-2; by wavelet analysis as in example 1 below, rail current can be decomposed into various kinds of ac components as shown in table 1 and uploaded to the filter controller 1-2; the filter controller 1-2 sets parameters of the filter 1-5 according to feedback data of the alternating current component detection module 1-3, controls the filter control switch 1-4 to be closed, and inputs the filter 1-5; filtering alternating current components in the steel rail current; for example, after filtering the 0.1-2Hz AC component in Table 1, rail potential can be reduced by 27.6%; meanwhile, the filter controller 1-2 feeds back the state and parameters of the filter 1-5 to the PLC control system 4 through the filter communication module 1-1; updating the monitored rail current and rail potential again;
step 3: if the state of the filter 1-5 is judged to be the input state in the step 2, the PLC control system 4 judges whether the contactor 5 needs to be switched on or switched off according to a preset protection strategy; if not, the input of the filter 1-5 effectively reduces the potential of the steel rail; after the interval T1, the PLC control system 4 sends an instruction for cutting off the filter 1-5 to the filter controller 1-2; the filter controller 1-2 controls the filter control switch 1-4 to be closed, and returns the working state of the filter module to the PLC control system 4; returning to the step 1, and updating the monitored steel rail current and steel rail potential again;
step 4: if the contactor 5 is judged to be in need of closing or opening in the step 3; the PLC control system 4 judges the state of the overvoltage suppression module 2 according to a preset protection policy; if the overvoltage suppression module 2 is in the on state, the contactor 5 can be operated at this time; the PLC control system 4 controls the contactor 5 to be switched on or switched off; the contactor 5 is operated, and the overvoltage suppression circuit 1-4 suppresses the operation overvoltage thereof; in the following embodiment, an RC circuit is used, and the parameter is set to r=7Ω and c=1.2×10 -6 F, the operation overvoltage can obtain the suppression effect as shown in fig. 6; turning to step 6;
step 5: if the overvoltage suppression module 2 is in the non-input state in the step 4; the PLC control system 4 sends data and input instructions to the overvoltage suppression controller 2-2 through the overvoltage suppression communication module 2-1; the overvoltage suppression controller 2-2 controls the overvoltage suppression control switch 2-3 to be closed, and the overvoltage suppression circuit 2-4 is put into operation; the overvoltage suppression controller 2-2 feeds back the input state of the overvoltage suppression circuit 2-4 to the PLC control system 4 through the overvoltage suppression communication module 2-1; the PLC control system 4 sends a closing or opening instruction of the contactor 5; turning to step 6;
step 6: after the interval T2, the PLC control system 4 sends an instruction to the overvoltage suppression controller 2-2 to cut off the overvoltage suppression circuit 2-4; the overvoltage suppression circuit 2-4 feeds back its operating state to the PLC control system 4.
Example 1
The reflux test data of a traction substation of a city track traffic power supply station system is shown in figure 4, and the rail potential limiting device and the control method of the city track traffic power supply system are adopted; the wavelet decomposition results of the above-mentioned reflux signals are shown in table 1, and it can be seen from the decomposition results that the low-frequency alternating current component of 0.1-2Hz in the rail current is more remarkable.
TABLE 1 Total reflux wavelet decomposition results for a traction substation
The low-frequency component of the current of the rail potential generates a certain alternating current rail potential, as shown in table 2, the effective value of the alternating current component of the rail potential of a certain traction substation, which is 0.1-2Hz, is 20.89V, and the direct current component is 54.78V; after the 0.1-2Hz alternating current component is filtered out by setting the parameters of the filter 1-5, the rail electric potential can be reduced by 27.6%; therefore, the rail potential caused by alternating current components can be effectively reduced by utilizing the filtering module.
TABLE 2 measurement of frequency content of rail potential by OVPD at certain traction substation
In addition, when the existing steel rail potential limiting device performs one-stage protection action, the actual measurement result of the operation overvoltage generated at the two ends of the contactor 5 is shown in fig. 5, the overvoltage amplitude can reach 818V, and the operation overvoltage exceeds the three-stage voltage protection action threshold value 600V in the existing protection strategy, so that the misoperation locking of the contactor 5 is caused; by establishing a simulation model of the urban rail transit reflux system, the simulation result of the operation overvoltage is shown in fig. 6 when the overvoltage suppression module 2 is not adopted at the two ends of the contactor 5; the overvoltage amplitude is 647V; the overvoltage suppression module 2 of the inventive structure (for example, an RC circuit) is provided in a model, wherein the RC circuit parameters are set to r=7Ω, c=1.2×10 -6 F, simulation results of the operation time of the contactor 5 are shown in fig. 7; from the figure, the operation overvoltage is restrained to 68.8V at the action moment of the contactor 5, and the overvoltage restraining module 2 can realize good overvoltage restraining effect, so that the problem of protection misoperation of the steel rail potential limiting device is avoided.
The invention can effectively reduce the rail potential of the traction substation and the station by filtering the alternating current component contained in the rail reflux; the rail potential limiting device is prevented from frequently acting, the overvoltage suppression module 2 is utilized to suppress the overvoltage of the operation of the contactor 5, and the rail potential limiting device is prevented from protecting misoperation, so that the aims of reducing the rail potential and reducing the stray current are fulfilled.
Claims (5)
1. A control method of a rail potential limiting device of an urban rail transit power supply system comprises a PLC control system (4), a trigger circuit (6) and a voltage monitoring circuit (3) which are all connected with the PLC control system; the trigger circuit (6) is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor (5) arranged between the steel rail and the ground; the two ends of the contactor (5) are connected with overvoltage suppression modules (2) in parallel; the overvoltage suppression module (2) is connected with the PLC control system (4); the system also comprises a filtering module (1) connected with the PLC control system (4); the filtering module (1) comprises a filtering communication module (1-1), a filtering controller (1-2) and an alternating current component detection module (1-3) which are connected in sequence; the filter control device also comprises a filter control switch (1-4) and a filter (1-5), which are all connected with the filter controller (1-2); the filter control switch (1-4) is connected with the filter (1-5); the filtering communication module (1-1) is connected with the PLC control system (4); the method is characterized by comprising the following steps of:
step 1: monitoring and acquiring current and potential data of a steel rail in real time;
step 2: judging whether the monitored potential of the steel rail reaches or exceeds a set valueU 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if yes, judging the state of the filtering module (1); if the filter module (1) is in the input state, the step 3 is carried out; if the filter module (1) is in an unexposure state, the PLC control system (4) sends out an instruction to control the exposure of the filter module, and input parameters are set; simultaneously, the feedback is fed back to the PLC control system (4) and the step 1 is returned;
step 3: the PLC control system (4) judges whether the contactor (5) needs to be switched on or switched off according to a preset protection strategy; if not, after the interval T1, the PLC control system (4) sends out a cutting command of the filtering module (1) and feeds back a result; returning to the step 1; judging the state of the overvoltage suppression module (2) if the overvoltage suppression module is needed; if the overvoltage suppression module (2) is put into operation, the step 4 is carried out; if the overvoltage suppression module (2) is not put into operation, the PLC control system (4) sends out a command to control the overvoltage suppression module (2) to be put into operation; the overvoltage suppression module (2) feeds back the state of the overvoltage suppression module to the PLC control system (4); turning to step 4;
step 4: the PLC control system (4) sends a closing or opening instruction of the contactor (5); after the interval T2, the PLC control system (4) sends out an instruction to cut off the overvoltage suppression module (2); the overvoltage suppression module (2) feeds back the working state of the overvoltage suppression module to the PLC control system (4).
2. The control method of a rail potential limiting device of an urban rail transit power supply system according to claim 1, wherein the filter (1-5) is one of a direct current filter and a band elimination filter.
3. A control method of a rail potential limiting device of an urban rail transit power supply system comprises a PLC control system (4), a trigger circuit (6) and a voltage monitoring circuit (3) which are all connected with the PLC control system; the trigger circuit (6) is connected with the control electrodes of the first thyristor TV1 and the second thyristor TV2 which are mutually connected in parallel; the device also comprises a contactor (5) arranged between the steel rail and the ground; the two ends of the contactor (5) are connected with overvoltage suppression modules (2) in parallel; the overvoltage suppression module (2) is connected with the PLC control system (4); the system also comprises a filtering module (1) connected with the PLC control system (4); the filtering module (1) comprises a filtering communication module (1-1), a filtering controller (1-2) and an alternating current component detection module (1-3) which are connected in sequence; the filter control device also comprises a filter control switch (1-4) and a filter (1-5), which are all connected with the filter controller (1-2); the filter control switch (1-4) is connected with the filter (1-5); the filtering communication module (1-1) is connected with the PLC control system (4); the overvoltage suppression module (2) comprises an overvoltage suppression communication module (2-1), an overvoltage suppression controller (2-2), an overvoltage suppression control switch (2-3) and an overvoltage suppression circuit (2-4) which are connected in sequence; the method is characterized by comprising the following steps of:
step 1: monitoring and acquiring current and potential data of a steel rail in real time;
step 2: judging whether the monitored potential of the steel rail exceeds a set valueU 1 The method comprises the steps of carrying out a first treatment on the surface of the If not, returning to the step 1; if the state of the filter (1-5) is judged, if the filter (1-5) is in an unexpended state, the PLC control system (4) sends steel rail current data and an unexpended control instruction of the filter (1-5) to the filter controller (1-2) through the filter communication module (1-1); the filter controller (1-2) controls the alternating current component detection module (1-3) to finish alternating current component detection and feeds the frequency spectrum back to the filter controller (1-2); the filter controller (1-2) sets parameters of the filter (1-5) according to feedback data of the alternating current component detection module (1-3), controls the filter to control the switch (1-4) to be closed, and inputs the filter (1-5); meanwhile, the filter controller (1-2) feeds back the state and parameters of the filter (1-5) to the PLC control system (4) through the filter communication module (1-1);
step 3: if the state of the filter (1-5) is judged to be the input state in the step 2, the PLC control system (4) judges whether the contactor (5) needs to be switched on or switched off according to a preset protection strategy; if not, after the interval T1, the PLC control system (4) sends an instruction for cutting off the filter (1-5) to the filter controller (1-2); the filter controller (1-2) controls the filter to control the switch (1-4) to be closed, and feeds back the result to the PLC control system (4); returning to the step 1;
step 4: if the contactor (5) is judged to be in need of closing or opening in the step 3; the PLC control system (4) judges the state of the overvoltage suppression module (2) according to a preset protection strategy; if the overvoltage suppression module (2) is in a put-in state, the PLC control system (4) controls the contactor to be switched on or off; turning to step 6;
step 5: if the overvoltage suppression module (2) is in an uninjected state in the step 4; the PLC control system (4) sends data and input instructions to the overvoltage suppression controller (2-2) through the overvoltage suppression communication module (2-1); the overvoltage suppression controller (2-2) controls the overvoltage suppression control switch (2-3) to be closed, and the overvoltage suppression circuit (2-4) is put into the overvoltage suppression circuit; the overvoltage suppression controller (2-2) feeds back the input state of the overvoltage suppression circuit (2-4) to the PLC control system (4) through the overvoltage suppression communication module (2-1); the PLC control system (4) sends a closing or opening instruction of the contactor (5); turning to step 6;
step 6: after the interval T2, the PLC control system (4) sends an instruction to the overvoltage suppression controller (2-2) to cut off the overvoltage suppression circuit (2-4); the overvoltage suppression circuit (2-4) feeds back the working state of the overvoltage suppression circuit to the PLC control system (4).
4. A control method of a rail potential limiting device of an urban rail transit power supply system according to claim 3, wherein the overvoltage suppressing circuit (2-4) is an RC overvoltage suppressing circuit.
5. A control method of a rail potential limiting device of an urban rail transit power supply system according to claim 1 or 3, characterized in that the filter module (1) is arranged between the rail and the ground.
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| CN109302811B (en) * | 2018-09-28 | 2023-08-22 | 天津斌德鑫力电子科技有限公司 | Suspension railway vehicle static debugging system |
| CN109066643B (en) * | 2018-09-29 | 2024-01-30 | 成都中工电气工程有限公司 | Rail potential limiting device |
| CN113036743B (en) * | 2020-05-25 | 2022-04-01 | 湖南恒创开拓电气有限公司 | Comprehensive treatment method and system for stray current and steel rail potential |
| CN112448381B (en) * | 2020-12-15 | 2023-03-03 | 通号（长沙）轨道交通控制技术有限公司 | Method for reducing steel rail potential and stray current corrosion of urban rail power supply system |
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