CN101950166B - Track electric potential limiting device and control method thereof - Google Patents
Track electric potential limiting device and control method thereof Download PDFInfo
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- CN101950166B CN101950166B CN2010102748682A CN201010274868A CN101950166B CN 101950166 B CN101950166 B CN 101950166B CN 2010102748682 A CN2010102748682 A CN 2010102748682A CN 201010274868 A CN201010274868 A CN 201010274868A CN 101950166 B CN101950166 B CN 101950166B
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Abstract
The invention discloses a track electric potential limiting device and a control method thereof. The track electric potential limiting device consists of a voltage limiting circuit, a protection circuit, a multi-point voltage monitoring unit, a splitter, a shunt, a current monitoring unit, a PLC control system unit and a working state display instrument. The core part of the voltage limiting circuit is a combination switch; the multi-point voltage monitoring unit detects the voltage between the track and the ground at multiple points along the track in real time; the PLC control system unit performs data processing of the detected voltages and controls the action of the combination switch in the voltage limiting circuit by using a fuzzy control method; the current monitoring unit is used for monitoring a current flowing between the track and a grounded bus and controls the combination switch to turn off automatically; the protection circuit is used for eliminating an instantaneous high voltage generated when the combination switch is turned on and off; and the working state display instrument displays the working state parameters in real time. The device and the method have the advantages that: a multi-point monitoring mode is adopted; the test accuracy of the system is improved; the hazards caused by overhigh track electric potential are eliminated; the response is made in time and safety; and the reliability is high.
Description
Technical field
The present invention relates to a kind of track current potential restraint device and control method thereof, be specially adapted to adopt in subway, the light rail systems the too high track current potential of multiple spot monitoring mode restriction, the passenger that prevents to get on or off the bus comes to harm.
Background technology
In order to prevent the harm of stray current, need to guarantee enough big railway roadbed resistance, so in the subway DC traction power-supply system, the rail insulation against ground is installed, thereby form independent protection ground (ground, station) and track ground (traction ground) separately.Back flow current when train is exercised possibly make track that the earth is produced unusual too high voltage.When some fault took place, like contact net and the short circuit of rail generation Metal Contact, contact net was to aerial earth wire generation Metal Contact fault, and DC equipment generation framework leakage failure etc. all can cause the too high unusually of track current potential.And stop platform when train, may touch this dangerous voltage during passenger getting on/off and come to harm, in order to reduce touch voltage and the step voltage between car body and the ground; Generally track current potential restraint device is set at station that is provided with traction substation and parking lot; The real-time voltage between monitoring rail and the earth, if when this voltage surpasses setting value, the action of track current potential restraint device; With rail in short-term with ground connection busbar short circuit, reduce the track current potential by force.This is general in the world a kind of safeguard procedures of protecting personal safety.
What the track current potential restraint device that is coming into operation at present adopted is the traditional control method of producer with timing relay mostly, and control accuracy and dirigibility are not high, and actuation time is long, and has the possibility of tripping.What on the control method of track current potential restraint device, adopt mostly is single-point monitoring track current potential, when single-point monitoring track current potential is higher than setting value, and the action of track current potential restraint device.But not enough below the single-point monitoring and control method exists:
(1) measuring accuracy is low, is prone to cause the misoperation of track current potential restraint device;
(2) Monitoring and Controlling has the regular hour to postpone, and does not shift to an earlier date forecast function, when the track potential anomalies is too high, can not in time control the action of track current potential restraint device, can produce injury to human body;
(3) do not consider one section interval inner orbit current potential situation, only the track current potential through certain point on the monitoring track is not enough to explain whether one section track current potential in the interval exceeds human body maximum safe limit voltage.
The closed foundation of track current potential restraint device action is whether the track current potential exceeds the human safety voltage; But owing to the change of track current potential with the running status of locomotive changes; Its variation tendency more complicated; And characteristics such as that each parameter has is non-linear, strong coupling, the mathematical models difficulty of therefore setting up this process is bigger, and general conventional control method is difficult to guarantee its control accuracy.
Summary of the invention
Technical matters: in view of above problem, the object of the present invention is to provide and adopt the multiple spot monitoring mode, consider the locomotive distance, simple in structure of arriving at a station, processing ease, measuring accuracy is high, the track current potential restraint device and the control method thereof of good reliability.
Technical scheme: track current potential restraint device of the present invention is connected to form by pressure limiting loop, protection loop, multipoint voltage monitoring means, shunt, current monitoring unit, PLC control system unit and duty Displaying Meter.The protection loop is parallelly connected with the pressure limiting loop, and pressure limiting loop core component is a combination switch, and combination switch one end is connected with track, and the other end is connected with the ground connection busbar; PLC control system unit is connected with voltage monitoring unit, current monitoring unit, and output terminal is connected with pressure limiting loop, duty Displaying Meter.
Combination switch in the pressure limiting loop is made up of the high-power thyristor and the contactor of reverse parallel connection; The parallelly connected setting of thyristor with contactor; The primary fault electric current that flows through in the track current potential restraint device is born in the quick conducting of high-power thyristor; Whether the conducting of each thyristor depends on the polarity of potential difference (PD) between rail and ground connection busbar, and contactor is used for bearing and passes through electric current for a long time.
The multipoint voltage monitoring means is made up of near track 8 track current potential transmitters along the line being evenly distributed on the station, and track current potential transmitter is used for detecting in real time the voltage between track and the ground connection busbar, and its monitoring range is 50V～150V.
The current monitoring unit mainly is made up of shunt and electric voltage observation circuit; Shunt is installed in the major loop; Its voltage of electric voltage observation circuit monitoring; Flow through the electric current between track and ground connection busbar when being converted into pressure limiting loop combination switch closure, when monitoring current was lower than preset value, track current potential restraint device automatically reset.
PLC control system unit is according to multipoint voltage monitoring means and the action of current monitoring unit monitoring result control combination switch and the state of Displaying Meter.
The control method of track current potential restraint device: the method that adopts multiple spot monitoring mode, fuzzy control; Detected potential value carries out data processing at track multiple spot place to the multipoint voltage monitoring means in PLC control system unit; Obtain track current potential extreme value and the locomotive distance of arriving at a station; Track current potential extreme value and locomotive are arrived at a station apart from carrying out Fuzzy processing, obtain the Fuzzy Processing result, the inquiry fuzzy control rule table; Draw the output controlled quentity controlled variable, can directly control the action of combination switch in the track current potential restraint device.Specific as follows:
(1) obtains the multiple spot potential value
The multipoint voltage monitoring means detects the voltage between near track multiple spot along the line place's track in station and the ground connection busbar in real time, and sends into PLC control system unit.
(2) obtain track current potential extreme value and the locomotive distance of arriving at a station
PLC control system unit adopts least square methods to carry out data fitting to a plurality of track potential values that obtain, and track current potential extreme value u is the greater during the PV that calculates of the intercept of fitting a straight line and axis of ordinates and actual monitoring are worth most; Locomotive arrives at a station and is calculated by the intercept of fitting a straight line and abscissa axis apart from s.Track current potential extreme value and locomotive arrive at a station and combine the action foundation as track current potential restraint device apart from both.
(3) input variable is the arrive at a station Fuzzy processing of distance of track current potential extreme value and locomotive
Track current potential extreme value u is divided into u1, u2, and the u3 Three Estate, it quantizes domain is U
i1,2, and 3}, { PL} is corresponding for PS, PM to concern 3 language values that make this value and fuzzy variable U by certain degree of membership.
Locomotive arrives at a station apart from s, and distance range is defined as [0,2000] m (this scope can be revised according to actual two-side feeding distance), and s is quantified as domain { 0; 1,2, the value among the 3}, and by 4 language value { O that make this value and fuzzy variable S with certain degree of membership relation; PS, PM, PL} is corresponding.
(4) fuzzy reasoning
Arriving at a station apart from the fuzzy variable of s after the obfuscation phase process with track current potential extreme value u and locomotive is input parameter, and the fuzzy control rule table that inquiry weaves draws fuzzy output quantity.
(5) output is handled
Fuzzy controller is output as the operating state of track current potential restraint device, be divided into be failure to actuate, timing contactor action, three kinds of states of contactor action.It quantizes domain O
iSo that 1,2, and 3}, { PL} is corresponding for PS, PM with the language value.The fuzzy output quantity that is drawn by fuzzy reasoning need not the action that precision can directly be controlled combination switch in the track current potential restraint device.
The realization of fuzzy controller in the PLC control system: will be stored in advance on the track current potential restraint device internal storage according to the track current potential restraint device operating state fuzzy polling list that fuzzy control rule is set up; In working control; 8 track current potential transmitters are measured near the track current potential the station in real time; PLC control system unit calculates track current potential extreme value and the locomotive distance of arriving at a station according to data processing rule, after Fuzzy processing, obtains required controlled quentity controlled variable through the inquiry fuzzy polling list; Directly the action of output track restrictions device realizes the fuzzy control of track current potential restraint device.
Beneficial effect: a kind of track restrictions device is applicable to the too high track current potential of subway (light rail) restriction; Compare with classic method; The combination switch that the pressure limiting loop adopts high-power thyristor and contactor to form has improved the quick-action property and the long-time excess current characteristic of installing, and this apparatus structure is simple; System extension is convenient, and reliability is high; Adopted the multiple spot monitoring mode; Avoided the single-point monitoring to judge inaccurate shortcoming; A kind of fuzzy control method is provided, can shifts to an earlier date predicted orbit current potential extreme value and the locomotive distance of arriving at a station, thus anticipation track current potential restraint device operating state; Eliminate the too high harm that brings of track current potential in advance, the promptness and the security that have improved system responses.
Description of drawings
Fig. 1 is that track current potential restraint device system forms schematic diagram,
Fig. 2 is pressure limiting circuit theory figure,
Fig. 3 is the installation site synoptic diagram of track current potential transmitter,
Fig. 4 is that the theoretical model curve of resolving of track Potential distribution distributes,
Fig. 5 is track current potential restraint device structure of fuzzy controller figure,
Fig. 6 is a program control flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Track current potential restraint device of the present invention is as shown in Figure 1; Be connected in series a combination switch between track and the ground connection busbar; The multipoint voltage monitoring means is made up of near track 8 track current potential transmitters along the line being evenly distributed on the station; Track current potential transmitter detects in real time surveys each point track potential value, and the current monitoring unit is made up of electric voltage observation circuit and shunt simultaneously.The protection loop is parallelly connected with the pressure limiting loop, the transient high voltage that causes with the break-make of protecting combination switch.Multipoint voltage monitoring means, current monitoring unit link to each other with PLC control system unit, and PLC control system unit links to each other with the duty Displaying Meter with the pressure limiting loop.The action of combination switch in the pressure limiting loop is controlled according to monitoring result in PLC control system unit, thereby limits too high track current potential.When the current monitoring unit monitored electric current that the pressure limiting loop stream crosses less than preset value, track current potential restraint device resetted.
Track current potential restraint device fuzzy control method is implemented as follows:
Like Fig. 2 track current potential transmitter is set; Measure the track current potential near one section zone, station in real time; In order to eliminate measuring error better; One group of voltage signal that 8 transmitters are measured at every turn fits to straight line, extracts the maximal value of its slope value and 8 transmitter measured values, utilizes the theoretical model curve of resolving of track Potential distribution to distribute as shown in Figure 3; Calculate track current potential extreme value u and locomotive and arrive at a station, arrive at a station apart from the input of s as fuzzy controller with the track current potential extreme value u and the locomotive of gained apart from s.
Structure of fuzzy controller is as shown in Figure 4, wherein D
1-D
8Be measured value at track multiple spot place track current potential transmitter; After the multimetering value adopts least square fitting; Obtaining track current potential extreme value u and locomotive arrives at a station apart from s; As the input of fuzzy controller, fuzzy controller is output as track current potential restraint device state output o after Fuzzy processing.
(1) obfuscation of input variable, quantification gradation and subordinate function
The action threshold value of track current potential restraint device is divided into u1, u2, and three state grades of u3, it quantizes domain U
i1,2,3}, and { PL} is corresponding for PS, PM, and subordinate function is as shown in table 1 to concern 3 language values that make this value and fuzzy variable U by certain degree of membership.
Table 1 track current potential extreme value u fuzzy variable is subordinate to kilsyth basalt
| u | U | 1 | 2 | 3 |
| u＜70 | PS | 1.0 | 0.2 | 0 |
| 70≤u＜90 | PM | 0.2 | 1.0 | 0.4 |
| u≥90 | PL | 0 | 0.2 | 1.0 |
[0043]Locomotive arrives at a station apart from s, and distance range is defined as [0,2000] (this scope can be revised according to actual two-side feeding distance); S is quantified as domain { 0,1,2; Value among the 3}, and by 4 language values { O, PS making this value and fuzzy variable S with certain degree of membership relation; PM, PL} is corresponding, and subordinate function is as shown in table 2.
Table 2 locomotive arrives at a station and belongs to kilsyth basalt apart from fuzzy change of s
| s | S | 0 | 1 | 2 | 3 |
| 0～200 | O | 1.0 | 0.2 | 0 | 0 |
| 200～800 | PS | 0.2 | 1.0 | 0.4 | 0 |
| 800～1500 | PM | 0 | 0.2 | 1.0 | 0.4 |
| 1500～2000 | PL | 0 | 0 | 0.2 | 1.0 |
(2) obfuscation of output variable, quantification gradation and subordinate function
O is the control variable of track current potential restraint device operating state, restraint device action be divided into be failure to actuate, deferred action, action immediately.{ 1,2, { PL} is corresponding for PS, PM by 3 language values of certain degree of membership relation and fuzzy variable O for the value among the 3} with the domain of control variable o.Membership function is as shown in table 3.
Table 3 output quantity o fuzzy variable is subordinate to kilsyth basalt
(3) fuzzy control rule
Sum up fuzzy control experience, it is as shown in table 4 to obtain following fuzzy control rule table.
Table 4 fuzzy control rule table
(4) realization of fuzzy controller in track current potential restraint device
To be stored in advance on the track current potential restraint device internal storage according to the track current potential restraint device operating state fuzzy polling list that fuzzy control rule is set up; In working control; 8 track current potential transmitters detect near the track potential value the station in real time; The PLC control system calculates track current potential extreme value and the locomotive distance of arriving at a station according to data processing method, after Fuzzy processing, obtains required controlled quentity controlled variable through the inquiry fuzzy polling list; Directly the output controlled quentity controlled variable realizes the fuzzy control of track current potential restraint device.Program control flow chart of the present invention is as shown in Figure 5.
Claims (2)
1. the control method of a track current potential restraint device is characterized in that: this device comprises pressure limiting loop, protection loop, multipoint voltage monitoring means, shunt, current monitoring unit, PLC control system unit and duty Displaying Meter; Wherein, the input end of multipoint voltage monitoring means is a track current potential transmitter, the signal of acquisition trajectory current potential transmitter; The output termination PLC control system unit of multipoint voltage monitoring means is input to PLC control system unit with gathering the signal that comes; The output terminal of PLC control system unit is connected with pressure limiting loop, duty Displaying Meter respectively; The pressure limiting loop with the protection loop parallelly connected after; The one of which end is connected with track, and the other end is connected with the ground connection busbar through shunt; The input end of current monitoring unit is connected on the two ends of shunt, and the output terminal of current monitoring unit connects another input end of PLC control system unit; Described pressure limiting loop core component is a combination switch; High-power thyristor and contactor by reverse parallel connection constitute; Contactor is parallelly connected with thyristor; The primary fault electric current that flows through in the track current potential restraint device is born in the quick conducting of high-power thyristor, adopts contactor to bear and passes through electric current for a long time;
Adopt fuzzy control method; Detected potential value carries out data processing at track multiple spot place to the multipoint voltage monitoring means in PLC control system unit, obtains track current potential extreme value and the locomotive distance of arriving at a station, and track current potential extreme value and the locomotive distance of arriving at a station is carried out Fuzzy processing; Obtain the Fuzzy Processing result; The inquiry fuzzy control rule table draws the output controlled quentity controlled variable, can directly control the action of combination switch in the track current potential restraint device; Specific as follows:
1) obtains the multiple spot potential value
The multipoint voltage monitoring means is monitored the voltage between near track multiple spot along the line place's track in station and the ground connection busbar in real time, and sends into PLC control system unit;
2) obtain track current potential extreme value and the locomotive distance of arriving at a station
PLC control system unit adopts least square methods to carry out data fitting to a plurality of track potential values that obtain, and track current potential extreme value u is the greater during the PV that calculates of the intercept of fitting a straight line and axis of ordinates and actual monitoring are worth most; Locomotive arrives at a station and is calculated by the intercept of fitting a straight line and abscissa axis apart from s, and track current potential extreme value and locomotive arrive at a station and combine the action foundation as track current potential restraint device apart from both;
3) input variable is the arrive at a station Fuzzy processing of distance of track current potential extreme value and locomotive
Track current potential extreme value u is divided into u1, u2, and the u3 Three Estate, it quantizes domain is U
i1,2, and 3}, { PL} is corresponding for PS, PM to concern 3 language values that make this value and fuzzy variable U by its degree of membership;
Locomotive arrives at a station apart from s, and distance range is defined as [0,2000] m, with s be quantified as domain 0,1,2, the value among the 3}, and by 4 language values that make this value and fuzzy variable S with its degree of membership relation O, PS, PM, PL} is corresponding;
4) fuzzy reasoning
Arriving at a station apart from the fuzzy variable of s after the obfuscation phase process with track current potential extreme value u and locomotive is input parameter, and the fuzzy control rule table that inquiry weaves draws fuzzy output quantity;
5) output is handled
Fuzzy controller is output as the operating state of track current potential restraint device, be divided into be failure to actuate, timing contactor action, three kinds of states of contactor action; It quantizes domain O
iSo that 1,2, and 3}, { PL} is corresponding for PS, PM with the language value; The fuzzy output quantity that is drawn by fuzzy reasoning need not the action that precision can directly be controlled combination switch in the track current potential restraint device.
2. the control method of track current potential restraint device according to claim 1; It is characterized in that: adopt the multiple spot monitoring mode; The multipoint voltage monitoring means is made up of near track 8 track current potential transmitters along the line being evenly distributed on the station; Track current potential transmitter is monitored the voltage between track and the ground connection busbar in real time, and its monitoring range is at 50V～150V.
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| CN105573165B (en) * | 2015-12-30 | 2018-07-24 | 天津凯发电气股份有限公司 | Intelligent protection control system for platform door potential abnormality and protection method thereof |
| CN105911391B (en) * | 2016-04-28 | 2018-09-14 | 中国铁建电气化局集团第一工程有限公司 | A kind of RPLDECT rails potential limiting device opering characteristic of electric apparatus tester |
| CN108297741B (en) * | 2017-12-22 | 2019-10-29 | 北京交通大学 | A kind of reduction subway train track potential system |
| CN109444633B (en) * | 2018-11-15 | 2020-06-23 | 中车株洲电力机车有限公司 | Rubber-tyred rail vehicle station-entering grounding safety monitoring system |
| CN113093053B (en) * | 2021-04-02 | 2022-05-17 | 广州市扬新技术研究有限责任公司 | Rail potential and stray current real-time monitoring system |
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| CN201646441U (en) * | 2010-03-25 | 2010-11-24 | 中国矿业大学 | Track potential limiting device |
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Address after: 221116 No. 1 University Road, copper mountain, Jiangsu, Xuzhou Patentee after: China University of Mining & Technology Address before: 221116 science and Technology Department, China University of Mining and Technology, Sanhuan South Road, Xuzhou, Jiangsu Patentee before: China University of Mining & Technology |
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