A method for reducing the generation of stray currents caused by the return current of the power supply line in subway running rails.

Abstract

The present invention relates to a system and method for reducing stray current caused by power supply return current of subway running rail, which is suitable for the power supply system of track return line adopted in DC power-supplied subway trains. By adopting parallel-connected connection branches composed of inductors, supercapacitors, IGBT switches, contactors, etc., and intelligently controlling the conduction and flow direction of current, and effectively filtering the harmonic components of return current, it can effectively reduce the leakage of harmonic components of stray current caused by harmonics from inverter switching circuits of trains to the outside of the running rail itself, and prevent electrochemical corrosion damage to other facilities and equipment.

Description

[Technical Field]

[0001] The present invention relates to a power supply system for track return lines used in DC-powered subway trains, and the proposed technology can effectively reduce electrochemical corrosion that occurs when harmonic components of stray currents caused by harmonics from the train's inverter switching circuit leak outside the track itself, thereby damaging other facilities and equipment. [Background technology]

[0002] Please refer to Figure 1.

[0003] Conventional technologies aim to reduce stray currents by lowering the potential of the running rails, strengthening the ground-to-ground insulation of the DC power supply and running rails, installing a stray current collection network to shield each layer, and forming a first shield network using the initial pathway of stray currents (i.e., the reinforcing bars in the track bed structure) to prevent stray currents from leaking outside the track bed. They also form a second shield network by connecting the reinforcing bars in the tunnel structure to prevent stray currents from leaking outside the tunnel and damaging other facilities. However, these measures still fail to adequately solve the problem of stray current leakage to the outside.

[0004] Currently, the dangers of stray currents in subways in major cities around the world include electrochemical corrosion of metal pipes buried around the subway, the outer sheaths of communication cables, the reinforcing steel in the main structures of stations and tunnels between stations, and even the reinforcing steel in the foundations of surrounding buildings. Such electrochemical corrosion not only shortens the lifespan of metal pipes but also reduces the strength and durability of the main reinforced concrete structures of subways, which can even lead to catastrophes. This is a common problem for subways around the world.

[0005] When dealing with already-operated tracks or new tracks under construction, it is impossible to change the extent of corrosion damage caused by stray currents. Furthermore, there are no measures to filter the running rails themselves, which are the source of stray currents, and current analytical theories all analyze from the perspective of pure DC. However, the inverter of a train is a switching circuit composed of IGBTs, and the fundamental wave immediately after the train starts up is close to a sine wave. Moreover, when the control from asynchronous modulation to synchronous modulation and during synchronous modulation replace the sine wave with a higher-order square wave, and finally replaces a half-sine wave with a single square wave, an abnormal oscillation convergence process appears at these transition points, so the three phases are not in equilibrium at the same time, and this is also observed in actual measurements. For this reason, the leaked stray current consists of two components, DC and AC, and the network of reinforced concrete structures of the running rails, busbars, and track bed, which are tens of kilometers long, form a large capacitance. The rails are positive and the ground is negative. Even with sufficient insulation, the pitch is small due to the strength requirements of the supporting track corresponding to the reinforcing bars of the track bed structure. Since I (stray current) = V (track) ωC, even with a large C value, the harmonic components resemble a short circuit to ground. Furthermore, even after the stray current is transmitted to the next level of shielding network, the harmonic components remain and still form leakage to the outside. This is the reason why stray current leakage cannot be controlled. The return current peak of a regular 6-car train reaches 3000 amperes, and stray current accounts for only a small portion, but its absolute value is still not small, and the harmonic components contained in the stray current are more harmful. After train operation, after the rails have warmed up, or due to factors such as humidity (water evaporates), the net resistance between the rails and the rail foundations increases, reducing the DC component of the stray current, while the AC component of the stray current remains unchanged.

[0006] A more effective existing solution involves using a third rail for the return current, preventing it from passing through the running rail. However, this is extremely costly, and more importantly, it makes it impossible to modify completed track layouts. [Overview of the project] [Problems that the invention aims to solve]

[0007] In view of the shortcomings of the prior art, the present invention aims to provide the first feasible and effective filtering of the rail itself, thereby reducing the harmonic components of the return current of the rail itself from its source, and thereby reducing the leakage of stray current. [Means for solving the problem]

[0008] To achieve the aforementioned objective, the present invention employs the following technical approach.

[0009] This method reduces the generation of stray currents caused by the power return current of subway rails. It employs a filtering method for the harmonic components of the return current of the rails themselves, which are the source of the stray currents. When the physical steel rails of the rails are maintained in a continuous, unchanging state, a connection branch consisting of an inductor, supercapacitor, IGBT switch, and contactor is used. By controlling the contacts of the IGBT switch and contactor, the supercapacitor is discharged, creating a voltage that blocks the forward flow in the parallel rail segment. Current is then forced to flow through the parallel branch consisting of the inductor, supercapacitor, IGBT switch, and contactor in series, effectively filtering the harmonic components of the return current. When the physical steel rails of the rails are discontinuous, an insulating joint is used, and the inductor is connected in parallel to effectively filter the harmonic components of the return current.

[0010] This system reduces the generation of stray currents caused by the power return current of subway running rails, and includes filter connection unit 1, filter connection unit 2 (for selective use), and filter connection unit 3.

[0011] The filter connection unit 1 is electrically connected to the underside of the running rail at the rear of the train when the train 5 stops at the station platform, and is connected in parallel with the running rail.

[0012] Here, the first connection line 101 end of the running rail of the filter connection unit 1 is connected to the running rail at the rear of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 8 via the running rail. The second connection line 102 end of the running rail of the filter connection unit 1 is connected to the running rail at the rear of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 7 via the running rail, forming a parallel branch.

[0013] The filter connection unit 2 is electrically connected to the running rail at the front of the train when the train 5 stops at the station platform, and is connected in parallel with the running rail.

[0014] Here, the first connection line 201 end of the running rail of the filter connection unit 2 is connected to the running rail at the front of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 8 via the running rail. The second connection line 202 end of the running rail of the filter connection unit 2 is connected to the running rail at the front of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 7 via the running rail, forming a parallel branch.

[0015] The filter connection unit 3 is electrically connected to the underside of the rails when the train 5 has finished accelerating and entered a constant speed state, and is connected in parallel with the rails.

[0016] Here, the first connection line 301 end of the filter connection unit 3's running rail is connected to the running rail when the train 5 has finished accelerating and entered a constant speed state, and is connected to the negative terminal of the substation 8 via the running rail. The second connection line 302 end of the filter connection unit 3's running rail is connected to the running rail when the train 5 has finished accelerating and entered a constant speed state, and is connected to the negative terminal of the substation 7 via the running rail, forming a parallel branch.

[0017] The filter connection unit 1, the filter connection unit 2 (selectively used), and the filter connection unit 3 are each connected to the running rail and are independent operating devices that are not connected to each other.

[0018] The method for reducing the generation of stray current due to the return current of the subway running rail of the present invention includes practical technical solutions for filtering the return current of the running rail itself, such as the first aspect of the present invention, the second aspect of the present invention, the third aspect of the present invention, and the fourth aspect of the present invention. These are selected and applied according to the actual situation.

[0019] [First Aspect] The first aspect of the present invention includes the filter connection unit 1 according to the first aspect (see Fig. 3(a)), the filter connection unit 2 according to the first aspect (selectively used, see Fig. 4(a)), and the filter connection unit 3 according to the first aspect (see Fig. 5(a)).

[0020] The filter connection unit 1 according to the first aspect includes the first connection line 101 end of the running rail, an inductor L 112 , a supercapacitor C 111 , a normally open contact KM of a contactor 111 , a normally closed contact KM of a contactor 112 , a normally open contact KM of a contactor 113 , a normally closed contact KM of a contactor 114 , a bidirectional conduction IGBT switch Q 111 , and the second connection line 102 end of the running rail. Among them, the internal resistance R 111 of the running rail parallel segment, the inductor L 111 and the series internal resistance R 111 of the supercapacitor C 112 are included.

[0021] Here, the first connection line 101 end of the running rail is connected to the 103 end of the inductor L 111 by welding to the abdomen of the running rail, and the 104 end of the inductor L 111 is connected to the 105 end of the normally open contact KM 111 of the contactor, and the normally closed contact KM 114 of the contactorIt is connected to terminal 106 to form a parallel connection, and the contactor normally open contact KM 111 The 107 terminal is a supercapacitor C 111 It is connected to the positive terminal 108, and further to the normally closed contact KM of the contactor. 112 It is connected to terminal 109, and the contactor normally closed contact KM 114 The 111 terminal is a supercapacitor C 111 It is connected to the negative terminal 112, and further to the normally open contact KM of the contactor. 113 It is connected to terminal 113, and the contactor normally closed contact KM 112 The 110 terminal is a bidirectional conductive IGBT switch Q 111 It is connected to terminal 115 and the contactor normally open contact KM 113 It is connected to terminal 114 to form a parallel connection, and bidirectional conductive IGBT switch Q 111 The 116 end is connected to the 102 end of the second connecting track of the running rail.

[0022] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 111 The first connecting wire 101 end of the running rail has an internal resistance R of the running rail parallel segment. 111 One end is connected to the second connecting wire 102 of the running rail, and the end of the running rail parallel segment has an internal resistance R 111 It is connected to the other end.

[0023] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0024] In addition to the above technical proposal, the inductor L 111 Its function is to block the harmonic components of the return current, and the supercapacitor C 111 Its function is energy storage and discharge, and the contactor normally open contact KM 111 , contactor normally closed contact KM 112 , contactor normally open contact KM 113 , contactor normally closed contact KM 114Its function is that of a supercapacitor C 111 This involves adjusting the direction of the current flowing through the inductor L. 111 and supercapacitor C 111 They are connected in series, with a total internal resistance R 112 Includes a bidirectional conductive IGBT switch Q 111 It has an intelligent control function controlled by a control chip, which controls the forward and reverse flow of current, and supercapacitor C 111 The system regulates and protects against potential overvoltage and overcurrent during energy storage and discharge, and the entire unit is connected by a small number of cables.

[0025] The filter connection unit 2 according to the first embodiment has the first connection line 201 end of the running rail and an inductor L 121 , supercapacitor C 121 , contactor normally open contact KM 121 , contactor normally closed contact KM 122 , contactor normally open contact KM 123 , contactor normally closed contact KM 124 Bidirectional conductive IGBT switch Q 121 , including the second connecting wire 202 end of the running rail. Of these, the internal resistance R of the running rail parallel segment 121 , inductor L 121 and supercapacitor C 121 Series internal resistance R 122 It includes.

[0026] Here, the end of the first connecting wire 201 of the running rail is welded to the side of the running rail, thereby connecting to the inductor L 121 It is connected to terminal 203, and the inductor L 121 The 204 terminal is the normally open contact KM of the contactor. 121 It is connected to terminal 205 and the contactor normally closed contact KM 124 It is connected to terminal 206 to form a parallel connection, and the contactor normally open contact KM 121 The 207 terminal is a supercapacitor C 121 It is connected to the positive terminal 208, and further to the normally closed contact KM of the contactor. 122 It is connected to terminal 209, and the contactor normally closed contact KM 124The 211 terminal is a supercapacitor C 121 It is connected to the negative terminal 212, and further to the normally open contact KM of the contactor. 123 It is connected to terminal 213, and the contactor normally closed contact KM 122 The 210 terminal is a bidirectional conductive IGBT switch Q 121 It is connected to terminal 215 and the contactor normally open contact KM 123 It is connected to terminal 214 to form a parallel connection, and bidirectional conductive IGBT switch Q 121 The 216 end is connected to the 202 end of the second connecting track of the running rail.

[0027] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 121 The first connecting wire 201 end of the running rail has an internal resistance R of the running rail parallel segment. 121 One end is connected to the second connecting line 202 of the running rail, and the end of the running rail parallel segment has an internal resistance R 121 It is connected to the other end.

[0028] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0029] In addition to the above technical proposal, the inductor L 121 Its function is to block the harmonic components of the return current, and the supercapacitor C 121 Its function is energy storage and discharge, and the contactor normally open contact KM 121 , contactor normally closed contact KM 122 , contactor normally open contact KM 123 , contactor normally closed contact KM 124 Its function is that of a supercapacitor C 121 This involves adjusting the direction of the current flowing through the inductor L. 121 and supercapacitor C 121 They are connected in series, with a total internal resistance R 122 Includes a bidirectional conductive IGBT switch Q 121has an intelligent control function controlled by a control chip, and the function is to control the forward and reverse currents, and adjust and protect the possible overvoltage and overcurrent during the energy storage and discharge of the supercapacitor C 121 by adjusting and protecting the possible overvoltage and overcurrent during the energy storage and discharge of the supercapacitor C 121 . The whole unit is connected by a small number of cables.

[0030] The filter connection unit 3 according to the first aspect includes the first connection line 301 end of the running rail, the inductor L 131 , the supercapacitor C 131 , the bidirectional conduction IGBT switch Q 131 , and the second connection line 302 end of the running rail. Among them, the internal resistance R 131 of the running rail parallel segment, the inductor L 131 and the series internal resistance R 131 of the supercapacitor C 132 are included.

[0031] Here, the first connection line 301 end of the running rail is connected to the 303 end of the inductor L 131 by welding with the abdomen of the running rail, and the 304 end of the inductor L 131 is connected to the negative electrode end 305 of the supercapacitor C 131 , the positive electrode end 306 of the supercapacitor C 131 is connected to the 307 end of the bidirectional conduction IGBT switch Q 131 , and the 308 end of the bidirectional conduction IGBT switch Q 131 is connected to the second connection line 302 end of the running rail.

[0032] In addition to the above technical solution, the running rail itself between the first connection line 301 end of the running rail and the second connection line 302 end of the running rail is physically continuously and invariantly maintained as a whole, and the internal resistance R 131 of the running rail parallel segment is included. The first connection line 301 end of the running rail is connected to one end of the internal resistance R 131 of the running rail parallel segment, and the second connection line 302 end of the running rail is connected to the other end of the internal resistance R 131 of the running rail parallel segment.

[0033] The welded connection to the running rail at both ends of the first connection line 301 and the second connection line 302 of the running rail is brazing.

[0034] The inductor L 131 functions to block the harmonic components of the return current, and the function of the supercapacitor C 131 is energy storage and discharge. The inductor L 131 and the supercapacitor C 131 are connected in series, include the total internal resistance R 132 and the bidirectional conduction IGBT switch Q 131 has an intelligent control function controlled by a control chip. Its function is to control the forward and reverse flow of current and adjust and protect the possible overvoltage and overcurrent during the energy storage and discharge of the supercapacitor C. The whole unit is connected by a small amount of cables. In addition to the above technical solution, the bidirectional conduction IGBT switch can be replaced by a contactor. 131

[0035] [Second Aspect] The second aspect of the present invention includes a filter connection unit 1 according to the second aspect, a filter connection unit 2 according to the second aspect (selectively used), and a filter connection unit 3 according to the second aspect. The second aspect of the present invention includes a filter connection unit 1 according to the second aspect, a filter connection unit 2 according to the second aspect (selectively used), and a filter connection unit 3 according to the second aspect.

[0036] Please refer to Fig. 6(a).

[0037] The filter connection unit 1 of the second aspect includes the first connection line 101 end of the running rail, an insulating joint J 211 an inductor L 211 and the second connection line 102 end of the running rail. Among them, the internal resistance R 211 of the inductor L 211 is included.

[0038] Here, the first connection line 101 end of the running rail is welded to the abdomen of the running rail and connected to the inductor L 211It is connected to the 119 end and insulated joint J 211 It is connected to terminal 117, and the inductor L 211 The 120 end is connected to the second connecting wire 102 end of the running rail, and at the same time, the second connecting wire 102 end of the running rail is connected to an insulating joint J 211 It is connected to terminal 118.

[0039] In addition to the above technical proposal, the insulating joint J 211 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 211 117 end and insulating joint J 211 The connection between the 118 end and the other end is electrically insulated, and the current loop between the first connecting wire 101 end of the running rail and the second connecting wire 102 end of the running rail is interrupted.

[0040] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0041] In addition to the above technical proposal, the inductor L 211 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0042] The filter connection unit 2 according to the second embodiment has an insulating joint J at the end of the first connection line 201 of the running rail. 221 , inductor L 221 , including the second connecting wire 202 end of the running rail. Of these, inductor L 221 Internal resistance R 221 It includes.

[0043] Here, the end of the first connecting wire 201 of the running rail is welded to the side of the running rail, thereby forming an inductor L 221 It is connected to the 219 end and insulated joint J 221 It is connected to terminal 217, and the inductor L 221The 220 end is connected to the second connecting wire 202 end of the running rail, and at the same time, the second connecting wire 202 end of the running rail is connected to an insulating joint J 221 It is connected to terminal 218.

[0044] In addition to the above technical proposal, the insulating joint J 221 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 221 217 end and insulating joint J 221 The connection between the 218 end and the other end is electrically insulated, and the current loop between the first connecting wire 201 end of the running rail and the second connecting wire 202 end of the running rail is interrupted.

[0045] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0046] In addition to the above technical proposal, the inductor L 221 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0047] The filter connection unit 3 according to the second embodiment has an insulating joint J at the end of the first connection line 301 of the running rail. 231 , inductor L 231 , including the second connecting wire 302 end of the running rail. Of these, inductor L 231 Internal resistance R 231 It includes.

[0048] Here, the end of the first connecting wire 301 of the running rail is welded to the side of the running rail, thereby forming an inductor L 231 It is connected to the 311 end and insulated joint J 231 It is connected to terminal 309, and the inductor L 231 The 312 end is connected to the 302 end of the second connecting wire of the running rail, and at the same time, the 302 end of the second connecting wire of the running rail is connected to an insulating joint J 231 It is connected to the 310 terminal.

[0049] In addition to the above technical proposal, the insulating joint J 231 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 231 309 end and insulating joint J 231 The connection between the 310 end and the other end is electrically insulated, and the current loop between the first connecting wire 301 end of the running rail and the second connecting wire 302 end of the running rail is interrupted.

[0050] The welding connection to the running rail at both the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is performed by brazing.

[0051] In addition to the above technical proposal, the function of the inductor L231 is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0052] [Third aspect of the present invention] A third aspect of the present invention includes a filter connection unit 1 according to the third aspect, a filter connection unit 2 (for selective use) according to the third aspect, and a filter connection unit 3 according to the third aspect.

[0053] Please refer to Figure 7(a).

[0054] The filter connection unit 1 according to the third embodiment has the first connection line 101 end of the running rail and an inductor L 311 , including the second connecting wire 102 end of the running rail. Among them, the internal resistance R of the running rail parallel segment 311 , inductor L 311 Internal resistance R 312 It includes.

[0055] Here, the end of the first connecting wire 101 of the running rail is welded to the side of the running rail, thereby forming an inductor L 311 It is connected to terminal 121 of the inductor L 311 The 122 end is connected to the 102 end of the second connecting line of the running rail.

[0056] In addition to the above technical proposal, the running rail itself, between the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail, is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 311 The first connecting wire 101 end of the running rail has an internal resistance R of the running rail parallel segment. 311 One end is connected to the second connecting wire 102 of the running rail, and the end of the running rail parallel segment has an internal resistance R 311 It is connected to the other end.

[0057] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0058] In addition to the above technical proposal, the inductor L 311 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0059] The filter connection unit 2 according to the third embodiment has the first connection line 201 end of the running rail and an inductor L 321 , including the second connecting wire 202 end of the running rail. Of these, the internal resistance R of the running rail parallel segment 321 , inductor L 321 Internal resistance R 322 It includes.

[0060] Here, the first connecting wire 201 end of the running rail is welded to the side of the running rail and connected to the inductor L 321 It is connected to terminal 221, and the inductor L 321 The 222 end is connected to the 202 end of the second connecting track of the running rail.

[0061] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 321The first connecting wire 201 end of the running rail has an internal resistance R of the running rail parallel segment. 321 One end is connected to the second connecting line 202 of the running rail, and the end of the running rail parallel segment has an internal resistance R 321 It is connected to the other end.

[0062] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0063] In addition to the above technical proposal, the function of the inductor L321 is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0064] The filter connection unit 3 according to the third embodiment has the first connection line 301 end of the running rail and an inductor L 331 , including the second connecting wire 302 end of the running rail. Among these, the internal resistance R of the running rail parallel segment 331 , inductor L 331 Internal resistance R 332 It includes.

[0065] Here, the end of the first connecting wire 301 of the running rail is welded to the side of the running rail, thereby forming an inductor L 331 It is connected to terminal 313, and the inductor L 331 The 314 end is connected to the 302 end of the second connecting track of the running rail.

[0066] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 331 The first connecting wire 301 end of the running rail has an internal resistance R of the running rail parallel segment. 331 One end is connected to the second connecting line 302 of the running rail, and the end of the running rail parallel segment has an internal resistance R 331 It is connected to the other end.

[0067] The welding connection to the running rail at both the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is performed by brazing.

[0068] In addition to the above technical proposal, the inductor L 331 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0069] [Fourth aspect of the present invention] A fourth aspect of the present invention is a composite application that is constructed by combining the first aspect of the present invention with the third aspect of the present invention.

[0070] Please refer to Figure 8.

[0071] The filter connection unit 1 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 101 of the running rail, the end of the second connection line 102 of the running rail, and the running rail, and the filter connection unit 1 according to the third embodiment is provided around the filter connection unit 1 according to the first embodiment and is formed by welding the end of the third connection line 141 of the running rail, the end of the fourth connection line 142 of the running rail, and the running rail, and the inductor L 411 (Internal resistance R 413 Between the (including) and the fourth connecting wire 142 end of the running rail, there is a bidirectional conductive IGBT switch Q 411 This is added, forming a second parallel branch.

[0072] Here, the end of the third connecting wire 141 of the running rail is an inductor L 411 It is connected to terminal 143, and the inductor L 411 Terminal 144 is a bidirectional conductive IGBT switch Q 411 Connected to terminal 145, bidirectional conductive IGBT switch Q 411 The 146 end is connected to the 142 end of the fourth connecting track of the running rail.

[0073] The welding connections to the running rail at both the end of the third connecting wire 141 and the end of the fourth connecting wire 142 of the running rail are performed by brazing.

[0074] In addition to the above technical proposal, the section between the end of the third connecting wire 141 and the end of the fourth connecting wire 142 of the running rail remains physically continuous and unchanging, and the internal resistance R of the running rail parallel segment 411 , the internal resistance R of the parallel segment of the running rail 412 Includes.

[0075] In addition to the above technical proposal, the bidirectional conductive IGBT switch Q 421 It has an intelligent control function controlled by a control chip, and this function is controlled by the supercapacitor C in the filter connection unit 1 according to the first embodiment. 111 When charging, the internal resistance R of the parallel segment of the running rail is controlled to turn off the switch itself. 111 The voltage formed within the segment is what causes the capacitor C 111 It is about charging.

[0076] The filter connection unit 2 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 201 of the running rail, the end of the second connection line 202 of the running rail, and the running rail, and the filter connection unit 2 according to the third embodiment is provided around the filter connection unit 2 of the first embodiment and is formed by welding the end of the third connection line 241 of the running rail, the end of the fourth connection line 242 of the running rail, and the running rail, and the inductor L 421 (Internal resistance R 423 Between the (including) and the fourth connecting wire 242 end of the running rail, there is a bidirectional conductive IGBT switch Q 421 This is added, forming a second parallel branch.

[0077] Here, the end of the third connecting wire 241 of the running rail is an inductor L 421 It is connected to terminal 243, and the inductor L 421 Terminal 244 is a bidirectional conductive IGBT switch Q 421Connected to terminal 245, bidirectional conductive IGBT switch Q 421 The 246 end is connected to the 242 end of the fourth connecting track of the running rail.

[0078] The welding connections to the running rail at both the end of the third connecting wire 241 and the end of the fourth connecting wire 242 of the running rail are performed by brazing.

[0079] In addition to the above technical proposal, the section between the end of the third connecting wire 241 and the end of the fourth connecting wire 242 of the running rail remains physically continuous and unchanging, and the internal resistance R of the running rail parallel segment 421 , the internal resistance R of the parallel segment of the running rail 422 Includes.

[0080] In addition to the above technical proposal, the bidirectional conductive IGBT switch Q 421 It has an intelligent control function controlled by a control chip, and this function is controlled by the supercapacitor C in the filter connection unit 2 according to the first embodiment. 121 When charging, the internal resistance R of the parallel segment of the running rail is controlled to turn off the switch itself. 121 The voltage formed within the segment is what causes the capacitor C 121 It is about charging.

[0081] The filter connection unit 3 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 301 of the running rail, the end of the second connection line 302 of the running rail, and the running rail, and the filter connection unit 3 according to the third embodiment is provided around the filter connection unit 3 of the first embodiment and is formed by welding the end of the third connection line 341 of the running rail, the end of the fourth connection line 342 of the running rail, and the running rail, and the inductor L 431 (Internal resistance R 433 Between the (including) and the fourth connecting wire 342 end of the running rail, there is a bidirectional conductive IGBT switch Q 431 This is added, forming a second parallel branch.

[0082] Here, the end of the third connection line 341 of the traveling rail is connected to the 343 end of the inductor L 431 The 344 end of the inductor L 431 is connected to the 345 end of the bidirectional conduction IGBT switch Q 431 The 346 end of the bidirectional conduction IGBT switch Q 431 is connected to the end of the fourth connection line 342 of the traveling rail.

[0083] The welded connections to the traveling rail at both the end of the third connection line 341 and the end of the fourth connection line 342 of the traveling rail are brazing.

[0084] In addition to the above technical solution, between the end of the third connection line 341 and the end of the fourth connection line 342 of the traveling rail, it is still physically continuously and invariantly maintained as a whole, and the internal resistance R of the traveling rail parallel segment 431 The internal resistance R of the traveling rail parallel segment 432 is included.

[0085] In addition to the above technical solution, the bidirectional conduction IGBT switch Q 431 has an intelligent control function controlled by a control chip, and its function is to control the switch itself to turn off when the supercapacitor C 131 is charged in the filter connection unit 3 according to the first aspect, so that the capacitor C 131 is charged under the voltage formed in the internal resistance R 131 segment of the traveling rail parallel segment. In addition to the above technical solution, the bidirectional conduction IGBT switch can be replaced by a contactor.

Advantages of the Invention

[0086] The present invention is the first to adopt and implement a filtering method for the return current of the running rail itself, which is the source of stray current, in the world's railway industry. It can significantly extend the service life of the reinforcing bars in the subway structure, surrounding buried metal pipes, communication cable sheaths, and even the reinforcing bars in the foundation concrete of surrounding building groups, thereby improving their safety and reliability and bringing great economic and social effects and global market expansion. Among these, the technical solutions described in the first, third, and fourth aspects of the present invention maintain the current status of the existing physical continuous track and do not require any modification of the operating line, and can significantly reduce the usage cost.

[0087] When the train starts, the overhead wire supplies power to the train, and the train outputs return current to the running rail through the wheels. Since the train is moving, the traction current of the train also moves through the return current output end of the wheels. When the train is within the range of Filter Connection Unit 1, Filter Connection Unit 2, and Filter Connection Unit 3 from the stationary section to the acceleration section, the technology used in the present invention takes filtering measures for the running rail itself and reduces the harmonic components of the stray current, thereby filtering the harmonic components of the return current output during the entire acceleration process of the train. However, outside the range from Filter Connection Unit 1 to Filter Connection Unit 3, the harmonic components of the stray current are minimized. The installation of Filter Connection Unit 2 is to reduce the influence of the harmonic components of the return current forming stray current on the station when the train enters synchronous modulation.

Brief Description of the Drawings

[0088] The present invention has the following drawings. [Figure 1] It is a schematic structural diagram of an invention related to preventing conventional stray current. [Figure 2(a)] It is a schematic structural diagram of the system of the method of the present invention for reducing the generation of stray current caused by the power supply return current of the subway running rail. [Figure 2(b)] It is a schematic diagram of the present invention when the train enters the station and is electrically braked. [Figure 2(c)]This is a schematic diagram of the present invention when a train starts moving. [Figure 2(d)] This is a schematic diagram of the present invention before the train accelerates and enters a constant speed state. [Figure 3(a)] This is a schematic diagram of the structure of a filter connection unit 1 according to a first aspect of the present invention. [Figure 3(b)] This figure shows the current flow when the filter connection unit 1 according to the first aspect of the present invention is switched on during electric braking when a train enters a depot. [Figure 3(c)] This diagram shows the current flow when the filter connection unit 1 according to the first aspect of the present invention is switched on between the time the train starts moving and when it finishes accelerating and enters a constant speed state. [Figure 4(a)] This is a schematic diagram of the structure of a filter connection unit 2 according to a first aspect of the present invention. [Figure 4(b)] This figure shows the current flow when the filter connection unit 2 according to the first aspect of the present invention is switched on during electric braking when a train enters a depot. [Figure 4(c)] This diagram shows the current flow when the filter connection unit 2 according to the first aspect of the present invention is switched on at the start of train operation. [Figure 4(d)] This figure shows the current flow when the filter connection unit 2 according to the first aspect of the present invention is switched on before the train accelerates and enters a constant speed state. [Figure 5(a)] This is a schematic diagram of the structure of a filter connection unit 3 according to the first aspect of the present invention. [Figure 5(b)] This figure shows the current flow when the filter connection unit 3 according to the first aspect of the present invention is switched on during electric braking when a train enters a depot. [Figure 5(c)] This diagram shows the current flow when the filter connection unit 3 according to the first aspect of the present invention is switched on between the time the train starts moving and when it finishes accelerating and enters a constant speed state. [Figure 6(a)] This is a schematic diagram of the structure of a unit according to a second aspect of the present invention. [Figure 6(b)]This figure shows the current flow in all connection units according to the second aspect of the present invention when a train starts moving. [Figure 6(c)] This figure shows the current flow in all connection units according to the second embodiment of the present invention before the train accelerates and enters a constant speed state. [Figure 7(a)] This is a schematic diagram of the structure of a connection unit according to a third aspect of the present invention. [Figure 7(b)] This figure shows the current flow through all connection units according to the third aspect of the present invention at the start of train operation. [Figure 7(c)] This figure shows the current flow in all connection units according to the third aspect of the present invention before the train accelerates and enters a constant speed state. [Figure 8] This is a schematic diagram of the structure of a connection unit according to a fourth aspect of the present invention. [Modes for carrying out the invention]

[0089] To describe the present invention in more detail, the technical proposal of the present invention will be described in further detail below with reference to the drawings and specific embodiments. Note that the following description is illustrative only and is not intended to limit the scope or uses of the present invention.

[0090] This invention employs a filtering method for the harmonic components of the return current of the running rail itself, which is the source of stray current. When the physical steel rail of the running rail is maintained without continuous change, a connection branch consisting of an inductor, supercapacitor, IGBT switch, and contactor is used. By controlling the contacts of the IGBT switch and contactor, the supercapacitor is discharged, forming a voltage that blocks the forward flow in the parallel rail segment. Current is then forced to flow through the parallel branch consisting of the inductor, supercapacitor, IGBT switch, and contactor in series, effectively filtering the harmonic components of the return current. When the physical steel rail of the running rail is discontinuous, an insulating joint is used, and the inductor is connected in parallel to effectively filter the harmonic components of the return current.

[0091] Figure 2(a) is a schematic structural diagram of a system for a method of reducing the generation of stray current due to the feeding return current of a subway running rail according to the present invention, and includes a filter connection unit 1, a filter connection unit 2 (selectively used), and a filter connection unit 3.

[0092] When the train 5 stops at the station platform, the filter connection unit 1 is electrically connected to the abdomen of the running rail at the end of the train, and is connected in parallel with the running rail.

[0093] Here, one end of the first connection line 101 of the running rail of the filter connection unit 1 is connected to the running rail at the end of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 8 through the running rail. One end of the second connection line 102 of the running rail of the filter connection unit 1 is connected to the running rail at the end of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 7 through the running rail, forming a parallel branch.

[0094] When the train 5 stops at the station platform, the filter connection unit 2 is electrically connected to the abdomen of the running rail at the head of the train, and is connected in parallel with the running rail.

[0095] Here, one end of the first connection line 201 of the running rail of the filter connection unit 2 is connected to the running rail at the head of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 8 through the running rail. One end of the second connection line 202 of the running rail of the filter connection unit 2 is connected to the running rail at the head of the train when the train 5 stops at the station platform, and is connected to the negative terminal of the substation 7 through the running rail, forming a parallel branch.

[0096] When the train 5 finishes accelerating and enters the constant speed state, the filter connection unit 3 is electrically connected to the abdomen of the running rail, and is connected in parallel with the running rail.

[0097] Here, the first connection line 301 end of the filter connection unit 3's running rail is connected to the running rail when the train 5 has finished accelerating and entered a constant speed state, and is connected to the negative terminal of the substation 8 via the running rail, and the second connection line 302 end of the filter connection unit 3's running rail is connected to the running rail when the train 5 has finished accelerating and entered a constant speed state, and is connected to the negative terminal of the substation 7 via the running rail, forming a parallel branch.

[0098] As shown in Figure 2(a), the filter connection unit 1, filter connection unit 2 (selectively used), and filter connection unit 3 are each connected to the running rail and are independent operating devices that are not connected to each other.

[0099] When the train starts, as shown in Figure 2(a), the overhead line 4 supplies power to the train 5, and the train 5 outputs a return current to the running rails via the wheels 6. As the train is moving, the traction current of the train 5 is also moving via the return current output terminals of the wheels 6. When the train is within the range of filter connection unit 1, filter connection unit 2, and filter connection unit 3 from the stationary section to the acceleration section, the technology used in the present invention filters the harmonic components of the return current output throughout the acceleration process of the train 5 by applying filtering measures to the running rails themselves and reducing the harmonic components of the stray current. Outside the range of filter connection unit 1 to filter connection unit 3, the harmonic components of the stray current are minimized, and the installation of filter connection unit 2 is to reduce the influence of stray current on the station due to the harmonic components of the return current when the train enters synchronous modulation.

[0100] Figure 2(b) is a schematic diagram of the present invention when a train enters the station and is electrically braked. When train 5 enters the platform and is electrically braked, its traction motor is in generator mode, and in this case, current I 11The current flows from the negative terminal of substation 7 through the running rails to the train wheels 6, and this current is not formed by a switching circuit and has extremely small harmonics, so no filtering method is employed, and current I 11 The water flows through the filter connection unit 3, filter connection unit 2, filter connection unit 1, and wheel 6 of the present invention before entering the train 5.

[0101] Figure 2(c) is a schematic diagram of the present invention when the train starts moving. When train 5 starts moving and leaves the station platform, the traction motor is in the electric motor state, and in this case the return current I 12 The current is output from train 5 via wheels 6, flows through the running rails to the negative terminal of substation 7, passes through filter connection unit 2 and filter connection unit 3 of the present invention to the negative terminal of substation 7, and simultaneously returns to the negative terminal of substation 7. 13 The current is output from train 5 via wheels 6, flows through the running rails to the negative terminal of substation 8, and reaches the negative terminal of substation 8 via the filter connection unit 1 of the present invention.

[0102] Figure 2(d) is a schematic diagram of the present invention before the train accelerates and enters a constant speed state. Before accelerating and entering a constant speed state, its position is approaching the filter connection unit 3 of the present invention, and in this case the return current I 12 The current is output from train 5 via wheels 6, flows through the running rails to the negative terminal of substation 7, passes through the filter connection unit 3 of the present invention to the negative terminal of substation 7, and simultaneously returns to the negative terminal of substation 7, while the return current I 13 The current is output from train 5 via wheels 6, flows through the running rails to the negative terminal of substation 8, and reaches the negative terminal of substation 8 via filter connection unit 2 and filter connection unit 1 of the present invention.

[0103] [First aspect of the present invention] A first aspect of the present invention, as shown in Figure 2(a), includes a filter connection unit 1 according to the first aspect, a filter connection unit 2 according to the first aspect (for selective use), and a filter connection unit 3 according to the first aspect.

[0104] As shown in Figure 3(a), the filter connection unit 1 according to the first embodiment has the first connection line 101 end of the running rail and an inductor L 111 , supercapacitor C 111 , contactor normally open contact KM 111 , contactor normally closed contact KM 112 , contactor normally open contact KM 113 , contactor normally closed contact KM 114 Bidirectional conductive IGBT switch Q 111 , including the second connecting wire 102 end of the running rail. Among them, the internal resistance R of the running rail parallel segment 111 , inductor L 111 and supercapacitor C 111 Series internal resistance R 112 It includes.

[0105] Here, the end of the first connecting wire 101 of the running rail is welded to the side of the running rail, thereby connecting to the inductor L 111 It is connected to terminal 103, and the inductor L 111 The 104 terminal is the normally open contact KM of the contactor. 111 It is connected to terminal 105 and the contactor normally closed contact KM 114 It is connected to terminal 106 to form a parallel connection, and the contactor normally open contact KM 111 The 107 terminal is a supercapacitor C 111 It is connected to the positive terminal 108, and further to the normally closed contact KM of the contactor. 112 It is connected to terminal 109, and the contactor normally closed contact KM 114 The 111 terminal is a supercapacitor C 111 It is connected to the negative terminal 112, and further to the normally open contact KM of the contactor. 113 It is connected to terminal 113, and the contactor normally closed contact KM 112 The 110 terminal is a bidirectional conductive IGBT switch Q 111 It is connected to terminal 115 and the contactor normally open contact KM 113 It is connected to terminal 114 to form a parallel connection, and bidirectional conductive IGBT switch Q 111 The 116 end is connected to the 102 end of the second connecting track of the running rail.

[0106] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 111 The first connecting wire 101 end of the running rail has an internal resistance R of the running rail parallel segment. 111 One end is connected to the second connecting wire 102 of the running rail, and the end of the running rail parallel segment has an internal resistance R 111 It is connected to the other end.

[0107] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0108] In addition to the above technical proposal, the inductor L 111 Its function is to block the harmonic components of the return current, and the supercapacitor C 111 Its function is energy storage and discharge, and the contactor normally open contact KM 111 , contactor normally closed contact KM 112 , contactor normally open contact KM 113 , contactor normally closed contact KM 114 is a supercapacitor C 111 This involves adjusting the direction of the current flowing through the inductor L. 111 and supercapacitor C 111 They are connected in series, with a total internal resistance R 112 Includes a bidirectional conductive IGBT switch Q 111 It has an intelligent control function controlled by a control chip, which controls the forward and reverse flow of current, and supercapacitor C 111 The system regulates and protects against potential overvoltage and overcurrent during energy storage and discharge, and the entire unit is connected by a small number of cables.

[0109] As shown in Figure 4(a), the filter connection unit 2 according to the first embodiment has the first connection line 201 end of the running rail and an inductor L 121 , supercapacitor C 121 , contactor normally open contact KM121 , contactor normally closed contact KM 122 , contactor normally open contact KM 123 , contactor normally closed contact KM 124 Bidirectional conductive IGBT switch Q 121 , including the second connecting wire 202 end of the running rail. Of these, the internal resistance R of the running rail parallel segment 121 , inductor L 121 and supercapacitor C 121 Series internal resistance R 122 It includes.

[0110] Here, the end of the first connecting wire 201 of the running rail is welded to the side of the running rail, thereby connecting to the inductor L 121 It is connected to terminal 203, and the inductor L 121 The 204 terminal is the normally open contact KM of the contactor. 121 It is connected to terminal 205 and the contactor normally closed contact KM 124 It is connected to terminal 206 to form a parallel connection, and the contactor normally open contact KM 121 The 207 terminal is a supercapacitor C 121 It is connected to the positive terminal 208, and further to the normally closed contact KM of the contactor. 122 It is connected to terminal 209, and the contactor normally closed contact KM 124 The 211 terminal is a supercapacitor C 121 It is connected to the negative terminal 212, and further to the normally open contact KM of the contactor. 123 It is connected to terminal 213, and the contactor normally closed contact KM 122 The 210 terminal is a bidirectional conductive IGBT switch Q 121 It is connected to terminal 215 and the contactor normally open contact KM 123 It is connected to terminal 214 to form a parallel connection, and bidirectional conductive IGBT switch Q 121 The 216 end is connected to the 202 end of the second connecting track of the running rail.

[0111] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 121The first connecting wire 201 end of the running rail has an internal resistance R of the running rail parallel segment. 121 One end is connected to the second connecting line 202 of the running rail, and the end of the running rail parallel segment has an internal resistance R 121 It is connected to the other end.

[0112] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0113] In addition to the above technical proposal, the inductor L 121 Its function is to block the harmonic components of the return current, and the supercapacitor C 121 Its function is energy storage and discharge, and the contactor normally open contact KM 121 , contactor normally closed contact KM 122 , contactor normally open contact KM 123 , contactor normally closed contact KM 124 Its function is that of a supercapacitor C 121 This involves adjusting the direction of the current flowing through the inductor L. 121 and supercapacitor C 121 They are connected in series, with a total internal resistance R 122 Includes a bidirectional conductive IGBT switch Q 121 It has an intelligent control function controlled by a control chip, which controls the forward and reverse flow of current, and supercapacitor C 121 The system regulates and protects against potential overvoltage and overcurrent during energy storage and discharge, and the entire unit is connected by a small number of cables.

[0114] As shown in Figure 5(a), the filter connection unit 3 according to the first embodiment has the first connection line 301 end of the running rail and an inductor L 131 , supercapacitor C 131 Bidirectional conductive IGBT switch Q 131 , including the second connecting wire 302 end of the running rail. Among these, the internal resistance R of the running rail parallel segment 131 , inductor L 131 and supercapacitor C131 Series internal resistance R 132 It includes.

[0115] Here, the end of the first connecting wire 301 of the running rail is welded to the side of the running rail, thereby inducting an inductor L 131 It is connected to terminal 303, and the inductor L 131 The 304 terminal is a supercapacitor C 131 The negative terminal 305 is connected to the supercapacitor C. 131 The positive terminal 306 is connected to the bidirectional conductive IGBT switch Q 131 Connected to terminal 307, bidirectional conductive IGBT switch Q 131 The 308 end is connected to the 302 end of the second connecting track of the running rail.

[0116] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 131 The first connecting wire 301 end of the running rail has an internal resistance R of the running rail parallel segment. 131 One end is connected to the second connecting line 302 of the running rail, and the end of the running rail parallel segment has an internal resistance R 131 It is connected to the other end.

[0117] The welding connection to the running rail at both the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is performed by brazing.

[0118] In addition to the above technical proposal, the inductor L 131 Its function is to block the harmonic components of the return current, and the supercapacitor C 131 Its function is energy storage and discharge, and the inductor L 131 and supercapacitor C 131 They are connected in series, with a total internal resistance R 132 Includes a bidirectional conductive IGBT switch Q 131It has an intelligent control function controlled by a control chip, which controls the forward and reverse flow of current, and supercapacitor C 131 The purpose is to regulate and protect against possible overvoltage and overcurrent during energy storage and discharge, and the entire unit is connected by a small number of cables. In addition to the above technical proposal, the bidirectional conductive IGBT switch can be replaced with a contactor.

[0119] [Embodiment] In a method for reducing the generation of stray current due to the power return current of the subway running rails, an embodiment of the first aspect of the present invention is as follows.

[0120] Figure 3(b) shows the current flow when the filter connection unit 1 according to the first embodiment is switched on during electric braking when a train enters the station. As shown in Figure 2(b), when train 5 enters the platform and is electrically braked, the bidirectional conductive IGBT switch Q in the filter connection unit 1 according to the first embodiment 111 As soon as the circuit is turned on, the contactor's normally closed contact KM 112 and contactor normally closed contact KM 114 When it turns on, the contactor normally open contact KM 111 and contactor normally open contact KM 113 The switch is turned off, and current I 11 Branch current I 111 The second connecting line 102 of the running rails leads to the supercapacitor C 111 It reaches the positive terminal, and further on, the supercapacitor C 111 Inductor L via the negative pole 111 (Inductor L 111 and supercapacitor C 111 Internal resistance R 112 After passing through (including), it reaches the end of the first connecting line 101 of the running rail, and then current I 11 The flow returns to wheel 6, and simultaneously the internal resistance R of the parallel segment of the running rail 111 The voltage formed at the supercapacitor C 111 The IGBT is charged, and after it is fully charged or when train 5 arrives at the filter connection unit 1 according to the first embodiment, the bidirectional conductive IGBT switch Q111 This turns off the circuit.

[0121] Figure 3(c) shows the current flow when the filter connection unit 1 according to the first embodiment is switched on from the time the train starts moving until it finishes accelerating and enters a constant speed state. As shown in Figures 2(c) and 2(d), when the train 5 starts moving and accelerates away from the station platform, the bidirectional conductive IGBT switch Q in the filter connection unit 1 according to the first embodiment 111 This turns the circuit on, and simultaneously the normally open contact KM of the contactor. 111 and contactor normally open contact KM 113 When it turns on, the contactor's normally closed contact KM 112 and contactor normally closed contact KM 114 The switch is turned off, and the fully charged supercapacitor C 111 Current I emitted from 130 The inductor L is connected to the positive terminal. 111 , the first connecting wire 101 end of the running rail, internal resistance R 111 A parallel segment of the running rail, including the second connecting line 102 of the running rail, and a supercapacitor C 111 It reaches the negative pole and forms a circuit (inductor L 111 and supercapacitor C 111 Internal resistance R 112 Forms a voltage (including the internal resistance R) 111 Return current I to the parallel segment of the running rail, including 13 The flow is interrupted, and the return current I 13 The second connecting wire 102 of the running rail, supercapacitor C 111 , inductor L 111 The current is forcibly supplied to the parallel branch at the end of the first connecting line 101 of the running rail, and the inductor L 111 The return current I 13 The harmonic components are filtered, and then the return current I 13 The current flows from the first connecting line 101 end of the running rail to the negative terminal of the substation 8, 130 The parallel branch described above flows repeatedly. When train 5 finishes accelerating and enters a constant speed state, the bidirectional conductive IGBT switch Q 111This turns off the circuit and resets all contact points within the unit.

[0122] Figure 4(b) shows the current flow when the filter connection unit 2 according to the first embodiment is switched on during electric braking when a train enters the station. As shown in Figure 2(b), when train 5 enters the platform and is electrically braked, the bidirectional conductive IGBT switch Q in the filter connection unit 2 according to the first embodiment 121 This turns the circuit on, and simultaneously the normally closed contact KM of the contactor 122 and contactor normally closed contact KM 124 When it turns on, the contactor normally open contact KM 121 and contactor normally open contact KM 123 The switch is turned off, and current I 11 Current I branched from 112 The second connecting wire 202 of the running rail is connected to the supercapacitor C 121 It reaches the positive terminal, and further on, the supercapacitor C 121 Inductor L from the negative terminal 121 (Inductor L 121 and supercapacitor C 121 Internal resistance R 122 After passing through (including), it reaches the end of the first connecting line 201 of the running rail, and then current I 11 The flow returns to wheel 6, and simultaneously the internal resistance R of the parallel segment of the running rail 121 Under the voltage formed in, supercapacitor C 121 The IGBT switch Q is charged and, after full charge, becomes bidirectionally conductive. 121 This turns off the circuit.

[0123] Figure 4(c) shows the current flow when the filter connection unit 2 according to the first embodiment is switched on at the start of train operation. As shown in Figure 2(c), when train 5 starts up and leaves the station platform, the bidirectional conductive IGBT switch Q in the filter connection unit 2 according to the first embodiment 121 This turns the circuit on, and simultaneously the normally closed contact KM of the contactor 122 and contactor normally closed contact KM 124 When it turns on, the contactor normally open contact KM 121 and contactor normally open contact KM 123The supercapacitor C is turned off. 121 Current I emitted from 120 This includes the positive terminal to the second connection line 202 of the running rail, a running rail parallel segment including internal resistance R121, the first connection line 201 of the running rail, and an inductor L 121 via supercapacitor C 121 It reaches the negative pole and forms a circuit (inductor L 121 and supercapacitor C 121 Internal resistance R 122 Forms a voltage (including the internal resistance R) 121 Return current I to the running rail parallel segment 12 The flow is interrupted, and the return current I 12 The first connecting wire 201 of the running rail, inductor L 121 , supercapacitor C 121 The current is forcibly supplied to the parallel branch at the end of the second connecting line 202 of the running rail, and the inductor L 121 The return current I 12 The harmonic components are filtered, and then the return current I 12 The current flows from the second connecting line 202 end of the running rail to the negative terminal of substation 7, 120 The parallel branch is repeatedly flowed through. When train 5 accelerates to the position of the filter connection unit 2 according to the first embodiment, the bidirectional conductive IGBT switch Q 121 It will turn off.

[0124] Figure 4(d) shows the current flow when the filter connection unit 2 according to the first embodiment is switched on before the train accelerates and enters a constant speed state. As shown in Figure 2(d), after the train 5 starts and accelerates, once it passes the location of the filter connection unit 2 according to the first embodiment, the direction of the return current on the rail becomes opposite to the direction shown in Figure 2(c). In this case, in the filter connection unit 2 according to the first embodiment, the normally open contact KM of the contactor 121 and contactor normally open contact KM 123 When it turns on, the contactor's normally closed contact KM 122 and contactor normally closed contact KM 124 The switch turns off, and after a very short time delay, the bidirectional conductive IGBT switch Q 121This turns on the circuit, and supercapacitor C 121 Current I emitted from 131 The inductor L is connected to the positive terminal. 121 , the first connecting wire 201 end of the running rail, internal resistance R 121 A parallel segment of running rails, including the second connecting line 202 of the running rails, and a supercapacitor C 121 It reaches the negative pole and forms a circuit (inductor L 121 and supercapacitor C 121 Internal resistance R 122 Forms a voltage (including the internal resistance R) 121 Return current I to the running rail parallel segment 13 The flow is interrupted, and the return current I 13 The second connecting wire 202 of the running rail, supercapacitor C 121 , inductor L 121 The current is forcibly supplied to the parallel branch at the end of the first connecting line 201 of the running rail, and the inductor L 121 The return current I 13 The harmonic components are filtered, and then the return current I 13 The current flows from the first connecting line 201 end of the running rail to the negative terminal of substation 8, 131 The parallel branch described above flows repeatedly. When train 5 finishes accelerating and enters a constant speed state, the bidirectional conductive IGBT switch Q 121 This turns off the circuit and resets all contact points within the unit.

[0125] Figure 5(b) shows the current flow when the filter connection unit 3 according to the first embodiment is switched on during electric braking when a train enters the station. As shown in Figure 2(b), when train 5 enters the platform and is electrically braked, the bidirectional conductive IGBT switch Q in the filter connection unit 3 according to the first embodiment 131 This turns on the circuit and the current I 11 Current I branched from 113 The second connecting wire 302 of the running rail is connected to the supercapacitor C 131 It reaches the positive terminal, and further on, the supercapacitor C 131 Inductor L from the negative terminal 131(Inductor L 131 and supercapacitor C 131 Internal resistance R 132 After passing through (including), it reaches the end of the first connecting line 301 of the running rail, and then current I 11 The flow returns to wheel 6, and simultaneously the internal resistance R of the parallel segment of the running rail 131 Under the voltage formed in, supercapacitor C 131 The IGBT switch Q is charged and, after full charge, becomes bidirectionally conductive. 131 This turns off the circuit.

[0126] Figure 5(c) shows the current flow when the filter connection unit 3 according to the first embodiment is switched on from the time the train starts moving until it finishes accelerating and enters a constant speed state. As shown in Figures 2(c) and 2(d), when the train 5 starts up and accelerates away from the station platform, the bidirectional conductive IGBT switch Q in the filter connection unit 3 according to the first embodiment 131 This turns on the circuit and fully charges the supercapacitor C 131 is current I 121 Open the terminal and connect the positive terminal to the second connecting wire 302 of the running rail, and the internal resistance R 131 A parallel segment of running rails including the first connecting wire 301 end of the running rail, and an inductor L 131 via supercapacitor C 131 It reaches the negative pole and forms a circuit (inductor L 131 and supercapacitor C 131 Internal resistance R 132 Forms a voltage (including the internal resistance R) 131 Return current I to the running rail parallel segment 12 The flow is interrupted, and the return current I 12 The first connecting wire 201 of the running rail, inductor L 121 , supercapacitor C 121 The current is forcibly supplied to the parallel branch at the end of the second connecting line 302 of the running rail, and the inductor L 131 The return current I 12 The harmonic components are filtered, and then the return current I 12The current flows from the second connecting line 302 end of the running rail to the negative terminal of substation 7, 121 The parallel branch described above flows repeatedly. When train 5 finishes accelerating and enters a constant speed state, the bidirectional conductive IGBT switch Q 111 This turns off the circuit.

[0127] The interval between subway trains is approximately 2 minutes or more, and when the following second train repeatedly applies the electric braking to train 5 as it enters the station, as shown in Figure 2(b), the filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the first embodiment repeat the charging process described above.

[0128] As train 5 starts up and accelerates away from the station platform as shown in Figures 2(c) and 2(d), the second train repeats this process, and the filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the first embodiment repeat the filtering process described above.

[0129] When selecting inductor and supercapacitance parameters, it is necessary to avoid the occurrence of resonance.

[0130] The control chip intelligently controls all bidirectional conductive IGBT switches and all contactor contacts within the entire unit, adjusting and controlling the direction of current changes in the supercapacitor, and protecting against possible overvoltage and overcurrent.

[0131] If an inductor or supercapacitor in any parallel branch of any unit fails, the unit's bidirectional IGBT switch immediately turns off the circuit, returning it to its pre-use state, and without any impact on train operation.

[0132] [Second aspect of the present invention] The second aspect of the present invention shown in Figure 6(a) includes a filter connection unit 1 according to the second aspect, a filter connection unit 2 (for selective use) according to the second aspect, and a filter connection unit 3 according to the second aspect.

[0133] As shown in Figure 6(a), the filter connection unit 1 according to the second embodiment has an insulating joint J at the end of the first connection line 101 of the running rail. 211 , inductor L 211 , including the second connecting wire 102 end of the running rail. Of these, inductor L 211 Internal resistance R 211 It includes.

[0134] Here, the end of the first connecting wire 101 of the running rail is welded to the side of the running rail, thereby forming an inductor L 211 It is connected to the 119 end and insulated joint J 211 It is connected to terminal 117, and the inductor L 211 The 120 end is connected to the second connecting wire 102 end of the running rail, and at the same time, the second connecting wire 102 end of the running rail is connected to an insulating joint J 211 It is connected to terminal 118.

[0135] In addition to the above technical proposal, the insulating joint J 211 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 211 117 end and insulating joint J 211 The connection between the 118 end and the other end is electrically insulated, and the current loop between the first connecting wire 101 end of the running rail and the second connecting wire 102 end of the running rail is interrupted.

[0136] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0137] In addition to the above technical proposal, the inductor L 211 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0138] As shown in Figure 6(a), the filter connection unit 2 according to the second embodiment has an insulating joint J at the end of the first connection line 201 of the running rail.221 , inductor L 221 , including the second connecting wire 202 end of the running rail. Of these, inductor L 221 Internal resistance R 221 It includes.

[0139] Here, the end of the first connecting wire 201 of the running rail is welded to the side of the running rail, thereby forming an inductor L 221 It is connected to the 219 end and insulated joint J 221 It is connected to terminal 217, and the inductor L 221 The 220 end is connected to the second connecting wire 202 end of the running rail, and at the same time, the second connecting wire 202 end of the running rail is connected to an insulating joint J 221 It is connected to terminal 218.

[0140] In addition to the above technical proposal, the insulating joint J 221 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 221 217 end and insulating joint J 221 The connection between the 218 end and the other end is electrically insulated, and the current loop between the first connecting wire 201 end of the running rail and the second connecting wire 202 end of the running rail is interrupted.

[0141] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0142] In addition to the above technical proposal, the inductor L 221 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0143] As shown in Figure 6(a), the filter connection unit 3 according to the second embodiment has an insulating joint J at the end of the first connection line 301 of the running rail. 231 , inductor L 231 , including the second connecting wire 302 end of the running rail. Of these, inductor L 231 Internal resistance R 231 It includes.

[0144] Here, the end of the first connecting wire 301 of the running rail is welded to the side of the running rail, thereby forming an inductor L 231 It is connected to the 311 end and insulated joint J 231 It is connected to terminal 309, and the inductor L 231 The 312 end is connected to the 302 end of the second connecting wire of the running rail, and at the same time, the 302 end of the second connecting wire of the running rail is connected to an insulating joint J 231 It is connected to the 310 terminal.

[0145] In addition to the above technical proposal, the insulating joint J 231 It is connected to the non-physical, continuous position of the steel rail of the running rail, i.e., an insulating joint J 231 309 end and insulating joint J 231 The connection between the 310 end and the other end is electrically insulated, and the current loop between the first connecting wire 301 end of the running rail and the second connecting wire 302 end of the running rail is interrupted.

[0146] The welding connection to the running rail at both the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is performed by brazing.

[0147] In addition to the above technical proposal, the inductor L 231 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0148] [Embodiment] In a method for reducing the generation of stray currents due to the power return current of the subway running rails, an embodiment of the second aspect of the present invention is as follows.

[0149] According to the harmonic component of the return current = V·ω·C, the capacitor (C) in all insulating joints according to the second aspect of the present invention is extremely small, and the harmonic component flowing through the insulating point is also extremely small.

[0150] Figure 6(b) shows the current flow in the filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the second embodiment when the train starts moving. As shown in Figure 2(c), when the train 5 starts up and leaves the station platform, the return current I 13 This outputs a return current to the running rail via the wheel 6 and flows to the negative terminal of the substation 8, and in this case, the insulating joint J in the running rail of the filter connection unit 1 according to the second embodiment 211 The return current I 13 Blocking, I 13 Most of them are the second connecting wire 102 end of the running rail, inductor L 211 (Its internal resistance R 211 (including) After passing through the parallel branch at the end of the first connecting line 101 of the running rail, it flows to the negative pole of the substation 8, and in this process, the inductor L 211 The return current I 13 The harmonic components are filtered out.

[0151] Return current I 12 This outputs a return current to the running rail via the wheel 6 and flows to the negative terminal of the substation 7, and in this case, the insulating joint J on the running rail of the filter connection unit 2 according to the second embodiment 221 The return current I 12 Blocking, I 12 Most of them are the first connecting wire 201 end of the running rail, inductor L 221 (Its internal resistance R 221 (including) After passing through the parallel branch at the end of the second connecting line 202 of the running rail, it flows to the negative terminal of substation 7, and in this process, inductor L 221 The return current I 12 The harmonic components are filtered. In this case, the insulating joint J on the running rail of the filter connection unit 3 according to the second embodiment 231 Return current I 12 Blocking, I 12 Most of them are the first connecting wire 301 end of the running rail, inductor L 231 (Its internal resistance R 231(including), after passing through the parallel branch at the end of the second connecting line 302 of the running rail, it flows to the negative terminal of the substation 7, and in this process, inductor L 231 The return current I 12 The harmonic components are filtered out.

[0152] Figure 6(c) shows the current flow in the filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the second embodiment before the train accelerates and enters a constant speed state. As shown in Figure 2(d), when the train 5 starts and accelerates and passes the location of the filter connection unit 2 according to the second embodiment, the insulating joint J on the running rail of the filter connection unit 2 according to the second embodiment 221 The return current I 13 It interrupts the return current I 13 Most of them are the second connecting wire 202 of the running rail, inductor L 221 (Its internal resistance R 221 (including) After passing through the parallel branch at the end of the first connecting line 201 of the running rail, it flows to the negative pole of substation 8, and in this process, inductor L 221 The return current I 13 The harmonic components are filtered out.

[0153] In this case, the filtering method of filter connection unit 1 and filter connection unit 3 according to the second embodiment is maintained as shown in Figure 6(b).

[0154] All units according to the second aspect of the present invention can improve the filtering effect by using an inductor device having high inductance.

[0155] Conventional railway tracks employ continuous tracks made of physical steel rails to ensure smooth and shock-free train operation and passenger comfort. Installing insulated points inevitably introduces some shock, adding considerable work burden to track modifications during operation and increasing daily maintenance costs.

[0156] [Third aspect of the present invention] The third aspect of the present invention shown in Figure 7(a) includes a filter connection unit 1 according to the third aspect, a filter connection unit 2 (for selective use) according to the third aspect, and a filter connection unit 3 according to the third aspect.

[0157] As shown in Figure 7(a), the filter connection unit 1 according to the third embodiment has the first connection line 101 end of the running rail and an inductor L 311 , including the second connecting wire 102 end of the running rail. Among them, the internal resistance R of the running rail parallel segment 311 , inductor L 311 Internal resistance R 312 It includes.

[0158] Here, the end of the first connecting wire 101 of the running rail is welded to the side of the running rail, thereby forming an inductor L 311 It is connected to terminal 121 of the inductor L 311 The 122 end is connected to the 102 end of the second connecting line of the running rail.

[0159] In addition to the above technical proposal, the running rail itself, between the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail, is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 311 The first connecting wire 101 end of the running rail has an internal resistance R of the running rail parallel segment. 311 One end is connected to the second connecting wire 102 of the running rail, and the end of the running rail parallel segment has an internal resistance R 311 It is connected to the other end.

[0160] The welding connection to the running rail at both the end of the first connecting wire 101 and the end of the second connecting wire 102 of the running rail is performed by brazing.

[0161] In addition to the above technical proposal, the inductor L 311 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0162] As shown in Figure 7(a), the filter connection unit 2 according to the third embodiment has the first connection line 201 end of the running rail and an inductor L 321 , including the second connecting wire 202 end of the running rail. Of these, the internal resistance R of the running rail parallel segment 321 , inductor L 321 Internal resistance R 322 It includes.

[0163] Here, the end of the first connecting wire 201 of the running rail is welded to the side of the running rail, thereby forming an inductor L 321 It is connected to terminal 221, and the inductor L 321 The 222 end is connected to the 202 end of the second connecting track of the running rail.

[0164] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 321 The first connecting wire 201 end of the running rail has an internal resistance R of the running rail parallel segment. 321 One end is connected to the second connecting line 202 of the running rail, and the end of the running rail parallel segment has an internal resistance R 321 It is connected to the other end.

[0165] The welding connection to the running rail at both the end of the first connecting wire 201 and the end of the second connecting wire 202 of the running rail is performed by brazing.

[0166] In addition to the above technical proposal, the inductor L 321 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0167] As shown in Figure 7(a), the filter connection unit 3 according to the third embodiment has the first connection line 301 end of the running rail and an inductor L 331, including the second connecting wire 302 end of the running rail. Among these, the internal resistance R of the running rail parallel segment 331 , inductor L 331 Internal resistance R 332 It includes.

[0168] Here, the end of the first connecting wire 301 of the running rail is welded to the side of the running rail, thereby forming an inductor L 331 It is connected to terminal 313, and the inductor L 331 The 314 end is connected to the 302 end of the second connecting track of the running rail.

[0169] In addition to the above technical proposal, the running rail itself between the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is physically maintained as a continuous and unchanging whole, and the internal resistance R of the running rail parallel segment 331 The first connecting wire 301 end of the running rail has an internal resistance R of the running rail parallel segment. 331 One end is connected to the second connecting line 302 of the running rail, and the end of the running rail parallel segment has an internal resistance R 331 It is connected to the other end.

[0170] The welding connection to the running rail at both the end of the first connecting wire 301 and the end of the second connecting wire 302 of the running rail is performed by brazing.

[0171] In addition to the above technical proposal, the inductor L 331 Its function is to block the harmonic components of the return current, and the entire unit is connected by a small amount of cable.

[0172] [Embodiment] In a method for reducing the generation of stray currents due to the power return current of the subway running rails, an embodiment of the third aspect of the present invention is as follows.

[0173] Figure 7(b) shows the current flow in the filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the third mode when the train starts moving. As shown in Figure 2(c), when the train 5 starts up and leaves the station platform, the return current I 13 The system outputs a return current to the running rail via the wheels 6, which flows to the negative terminal of the substation 8. In this case, the filter connection unit 1 according to the third embodiment uses an inductor L in a physically continuous running rail. 311 Connect them in parallel, and return current I 13 A portion of the return current I branched off from the main current 133 This is still the internal resistance R of the running rail itself, i.e., the parallel segment. 311 However, at the end of the second connecting line 102 of the running rail, the return current I 13 A portion of the return current I branched off from the main current 132 is an inductor L 311 (Its internal resistance R 312 (including) After passing through the parallel branch at the end of the first connecting line 101 of the running rail, it flows to the negative pole of the substation 8, and in this process, the inductor L 311 The return current I 132 The harmonic components are filtered out.

[0174] Return current I 12 The system outputs a return current to the running rail via the wheels 6, which flows to the negative terminal of the substation 7. In this case, the filter connection unit 2 according to the third embodiment uses an inductor L in a physically continuous running rail. 321 Connect them in parallel, and return current I 12 A portion of the return current I branched off from the main current 124 This is still the internal resistance R of the running rail itself, i.e., the parallel segment. 321 However, at the end of the first connecting line 201 of the running rail, the return current I 12 A portion of the return current I branched off from the main current 122 is an inductor L 321 (Its internal resistance R 322 (including) After passing through the parallel branch at the end of the second connecting line 202 of the running rail, it flows to the negative terminal of substation 7, and in this process, inductor L 321The return current I 122 The harmonic components are filtered. In this case, the filter connection unit 3 according to the third embodiment is connected to the inductor L in a physically continuous running rail. 331 Connect them in parallel, and return current I 12 A portion of the return current I branched off from the main current 125 This is still the internal resistance R of the running rail itself, i.e., the parallel segment. 331 However, at the end of the first connecting line 301 of the running rail, the return current I 12 A portion of the return current I branched off from the main current 123 is an inductor L 331 (Its internal resistance R 332 (including), after passing through the parallel branch at the end of the second connecting line 302 of the running rail, it flows to the negative terminal of the substation 7, and in this process, inductor L 331 The return current I 123 The harmonic components are filtered out.

[0175] Figure 7(c) shows the current flow in the filter connection unit 1, filter connection unit 2, and filter connection unit 3 of the third embodiment before the train accelerates and enters a constant speed state. As shown in Figure 2(d), when the train 5 starts and accelerates and passes the location of the filter connection unit 2 of the third embodiment, the filter connection unit 2 of the third embodiment uses an inductor L on the physically continuous running rail. 321 Connect them in parallel, and return current I 13 A portion of the return current I branched off from the main current 135 This is still the internal resistance R of the running rail itself, i.e., the parallel segment. 321 However, at the end of the second connecting line 202 of the running rail, the return current I 13 A portion of the return current I branched off from the main current 134 is an inductor L 321 (Its internal resistance R 322 (including) After passing through the parallel branch at the end of the first connecting line 201 of the running rail, it flows to the negative pole of substation 8, and in this process, inductor L 321 The return current I 134 The harmonic components are filtered out.

[0176] In this case, the filtering methods of the filter connection unit 1 and the filter connection unit 3 according to the third embodiment are maintained as shown in Figure 7(b).

[0177] [Fourth aspect of the present invention] Please refer to Figure 8.

[0178] A fourth aspect of the present invention is a composite application that combines the first aspect of the present invention with the third aspect of the present invention.

[0179] As shown in Figure 8, the filter connection unit 1 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 101 of the running rail, the end of the second connection line 102 of the running rail, and the running rail, and the filter connection unit 1 according to the third embodiment is provided around the filter connection unit 1 according to the first embodiment and is formed by welding the end of the third connection line 141 of the running rail, the end of the fourth connection line 142 of the running rail, and the running rail, and the inductor L 411 (Internal resistance R 413 Between the (including) and the fourth connecting wire 142 end of the running rail, there is a bidirectional conductive IGBT switch Q 411 This is added, forming a second parallel branch.

[0180] Here, the end of the third connecting wire 141 of the running rail is an inductor L 411 It is connected to terminal 143, and the inductor L 411 Terminal 144 is a bidirectional conductive IGBT switch Q 411 Connected to terminal 145, bidirectional conductive IGBT switch Q 411 The 146 end is connected to the 142 end of the fourth connecting track of the running rail.

[0181] The welding connections to the running rail at both the end of the third connecting wire 141 and the end of the fourth connecting wire 142 of the running rail are performed by brazing.

[0182] In addition to the above technical proposal, the section between the end of the third connecting wire 141 and the end of the fourth connecting wire 142 of the running rail remains physically continuous and unchanging, and the internal resistance R of the running rail parallel segment 411 , the internal resistance R of the parallel segment of the running rail 412 Includes.

[0183] In addition to the above technical proposal, a bidirectional conductive IGBT switch Q 421 It has an intelligent control function controlled by a control chip, and this function is performed in the filter connection unit 1 according to the first embodiment, with a supercapacitor C 111 When charging, the switch itself is controlled to turn off capacitor C 111 The internal resistance R of the parallel segment of the running rail 111 The goal is to ensure that it is charged under the voltage formed within it.

[0184] As shown in Figure 8, the filter connection unit 2 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 201 of the running rail, the end of the second connection line 202 of the running rail, and the running rail, and the filter connection unit 2 according to the third embodiment is provided around the filter connection unit 2 according to the first embodiment and is formed by welding the end of the third connection line 241 of the running rail, the end of the fourth connection line 242 of the running rail, and the running rail, and the inductor L 421 (Internal resistance R 423 Between the (including) and the fourth connecting wire 242 end of the running rail, there is a bidirectional conductive IGBT switch Q 421 This is added, forming a second parallel branch.

[0185] Here, the end of the third connecting wire 241 of the running rail is an inductor L 421 It is connected to terminal 243, and the inductor L 421 Terminal 244 is a bidirectional conductive IGBT switch Q 421 Connected to terminal 245, bidirectional conductive IGBT switch Q 421 The 246 end is connected to the 242 end of the fourth connecting track of the running rail.

[0186] The welding connections to the running rail at both the end of the third connecting wire 241 and the end of the fourth connecting wire 242 of the running rail are performed by brazing.

[0187] In addition to the above technical proposal, the section between the end of the third connecting wire 241 and the end of the fourth connecting wire 242 of the running rail remains physically continuous and unchanging, and the internal resistance R of the running rail parallel segment 421 , the internal resistance R of the parallel segment of the running rail 422 Includes.

[0188] In addition to the above technical proposal, a bidirectional conductive IGBT switch Q 421 It has an intelligent control function controlled by a control chip, and this function is performed in the filter connection unit 2 according to the first embodiment, with a supercapacitor C 121 When charging, the switch itself is controlled to turn off capacitor C 121 The internal resistance R of the parallel segment of the running rail 121 The goal is to ensure that it is charged under the voltage formed within it.

[0189] As shown in Figure 8, the filter connection unit 3 according to the first embodiment still forms a first parallel branch by welding the end of the first connection line 301 of the running rail, the end of the second connection line 302 of the running rail, and the running rail, and the filter connection unit 3 according to the third embodiment is provided around the filter connection unit 3 according to the first embodiment and is formed by welding the end of the third connection line 341 of the running rail, the end of the fourth connection line 342 of the running rail, and the running rail, and the inductor L 431 (Internal resistance R 433 Between the (including) and the fourth connecting wire 342 end of the running rail, there is a bidirectional conductive IGBT switch Q 431 This is added, forming a second parallel branch.

[0190] Here, the end of the third connecting wire 341 of the running rail is an inductor L 431 It is connected to terminal 343, and the inductor L 431Terminal 344 is a bidirectional conductive IGBT switch Q 431 Connected to terminal 345, bidirectional conductive IGBT switch Q 431 The 346 end is connected to the 342 end of the fourth connecting track of the running rail.

[0191] The welding connections to the running rail at both the end of the third connecting wire 341 and the end of the fourth connecting wire 342 of the running rail are performed by brazing.

[0192] In addition to the above technical proposal, the section between the end of the third connecting wire 341 and the end of the fourth connecting wire 342 of the running rail remains physically continuous and unchanging, and the internal resistance R of the running rail parallel segment 431 , the internal resistance R of the parallel segment of the running rail 432 Includes.

[0193] In addition to the above technical proposal, a bidirectional conductive IGBT switch Q 431 It has an intelligent control function controlled by a control chip, and this function is performed in the filter connection unit 3 according to the first embodiment, with a supercapacitor C 131 When charging, the switch itself is controlled to turn off capacitor C 131 The internal resistance R of the parallel segment of the running rail 131 The goal is to ensure that the device is charged under the voltage formed within it. In addition to the above technical proposal, the bidirectional conductive IGBT switch can be replaced with a contactor.

[0194] [Embodiment] In a method for reducing the generation of stray currents due to the power return current of the subway running rails, the fourth aspect of the present invention combines a specific embodiment of the third aspect of the present invention with a specific embodiment of the first aspect of the present invention, and the embodiment is as follows.

[0195] Figure 8 is a schematic diagram of the structure of a connection unit according to a fourth aspect of the present invention. As shown in Figure 2(b), when train 5 enters the platform and is electrically braked, the first parallel branch, consisting of filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the first aspect, still operates according to the embodiment of the first aspect of the present invention. In this case, the bidirectional conductive IGBT switch Q added to filter connection unit 1 according to the third aspect 411 , a bidirectional conductive IGBT switch Q added to the filter connection unit 2 according to the third embodiment. 421 , a bidirectional conductive IGBT switch Q added to the filter connection unit 3 according to the third embodiment. 431 By turning all of them off, all supercapacitors in the filter connection unit 1, the filter connection unit 2, and the filter connection unit 3 according to the first embodiment are charged under the voltage formed within the internal resistance segment of each parallel segment of the running rail.

[0196] As shown in Figures 2(c) and 2(d), when train 5 starts moving and accelerates away from the station platform, the first branch, consisting of filter connection unit 1, filter connection unit 2, and filter connection unit 3 according to the first embodiment, still operates according to the embodiment of the first embodiment of the present invention. Bidirectional conductive IGBT switch Q of filter connection unit 1 according to the third embodiment 411 , the bidirectional conductive IGBT switch Q of the filter connection unit 2 according to the third embodiment 421 , the bidirectional conductive IGBT switch Q of the filter connection unit 3 according to the third embodiment 431 All of these are turned on to execute the second parallel branch, operating according to the third embodiment of the present invention, further enhancing the filtering function for harmonic components of the return current.

[0197] In a fourth aspect of the present invention, a control chip intelligently controls all bidirectional conductive IGBT switches and all contactor contacts in all units, adjusts and controls changes in the current direction of the supercapacitor, and also protects against possible overvoltage and overcurrent.

[0198] If an inductor or supercapacitor in any parallel branch of any unit fails, the bidirectional conductive IGBT switch of that unit immediately turns off the circuit, returning it to its pre-use state, and without any impact on train operation.

[0199] The above are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. Modifications and substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed herein should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the claims.

[0200] Any matters not described in detail herein constitute prior art known to those skilled in the art.

Claims

1. A method for reducing stray currents caused by the power return current of subway rails, characterized by employing a filtering method for the harmonic components of the return current of the rail itself, which is the source of stray currents, employing a connection branch consisting of an inductor, a supercapacitor, an IGBT switch, and a contactor in a parallel connection while the physical steel rail of the rail is maintained without continuous change, controlling the contacts of the IGBT switch and the contactor to discharge the supercapacitor and form a voltage that blocks the forward flow in the parallel rail segment, forcing current to flow through the parallel branch consisting of an inductor, a supercapacitor, an IGBT switch, and a contactor in series, thereby effectively filtering the harmonic components of the return current.

2. The method according to claim 1, characterized in that, while the physical steel rails of the running rails are discontinuous, inductors are connected in parallel at the same time, and the harmonic components of the return current are effectively filtered.

3. The filter module comprises at least one filter connection unit, including filter connection unit 1 and filter connection unit 3, and a plurality of other filter connection units. The filter connection unit 1 is electrically connected to the underside of the running rail at the rear of the train when the train 5 stops at a station platform and is connected in parallel with the running rail, and the filter connection unit 3 is electrically connected to the underside of the running rail when the train 5 has finished accelerating and has entered a constant speed state and is connected in parallel with the running rail, a system for realizing a method for reducing the generation of stray current due to the power return current of a subway running rail as described in claim 1.

4. The filter module comprises at least one filter connection unit, including filter connection unit 1 and filter connection unit 3, and a plurality of other filter connection units. The filter connection unit 1 is electrically connected to the underside of the running rail at the rear of the train when the train 5 stops at a station platform and is connected in parallel with the running rail, and the filter connection unit 3 is electrically connected to the underside of the running rail when the train 5 has finished accelerating and has entered a constant speed state and is connected in parallel with the running rail, a system for realizing a method for reducing the generation of stray current due to the power return current of a subway running rail as described in claim 1.

5. The filter module comprises at least one filter connection unit, including filter connection unit 1 and filter connection unit 3, and a plurality of other filter connection units. The filter connection unit 1 is electrically connected to the underside of the running rail at the rear of the train when the train 5 stops at a station platform and is connected in parallel with the running rail, and the filter connection unit 3 is electrically connected to the underside of the running rail when the train 5 has finished accelerating and has entered a constant speed state and is connected in parallel with the running rail, a system for realizing a method for reducing the generation of stray current due to the power return current of a subway running rail as described in claim 2.

6. The system according to claim 3, wherein the plurality of filter connection units further include a filter connection unit 2 that is electrically connected to the bezel of the running rail at the front of the train when the train 5 stops at a station platform and is connected in parallel with the running rail.

7. The system according to claim 6, characterized in that the plurality of filter connection units of the filter module are each connected to the running rail and are independent actuators that are not connected to one another.

8. The system according to claim 3, wherein each of the filter connection units of the filter module includes at least one inductor for blocking harmonic components of the return current of the running rail.

9. The system according to claim 6, characterized in that each of the filter connection units of the filter module includes at least one inductor for blocking harmonic components of the return current of the running rail.

10. The system according to claim 7, characterized in that each of the filter connection units of the filter module includes at least one inductor for blocking harmonic components of the return current of the running rail.

11. The system according to claim 8, wherein at least one filter connection unit of the filter module includes at least one supercapacitor and at least one switch for discharging within the filter connection unit to form a current loop that interrupts the forward flow of parallel rail segments, the supercapacitor, the switch and the inductor are connected in series.

12. The system according to claim 11, characterized in that the filter connection unit has at least one contactor module for adjusting the direction of the current flowing through the supercapacitor.

13. The system according to claim 12, wherein the contactor module includes a plurality of normally open contacts and / or normally closed contacts, and the supercapacitor is connected in parallel and / or series with the plurality of normally open contacts and / or normally closed contacts.

14. The system according to any one of claims 11 to 13, characterized in that the switch is a bidirectional conductive IGBT switch for controlling the forward and reverse flow of current and for adjusting and protecting against possible overvoltages and overcurrents during energy storage and discharge of the supercapacitor.

15. The system according to claim 8, comprising an insulating joint provided in the web of the running rail, wherein at least one filter connection unit of the filter module is connectable in parallel to the web of the running rail via the insulating joint, and the insulating joint is used to interrupt current loops in the running rail.

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