Bilateral power supply synchronous closing device and control method

Abstract

The invention discloses a bilateral power supply synchronous switching-on device and a control method. The control method mainly comprises the steps of right feed line current and output voltage detection of a bus pulled by a left traction station and left feed line current and output voltage detection of a bus pulled by a right traction station. Meanwhile, the method comprises the detection of the current flowing in the subarea, the control of a connection switch and the state detection. And the controller judges whether the voltage phase and the feeder current of the two adjacent traction stations meet the switching-on condition or not according to the detected signals. And under the condition that the voltage phases at the two ends and the feeder current meet the switching-on condition, the controller drives the communication switches of the subareas to be switched on, so that bilateral power supply is realized. When abnormal conditions occur in the bilateral power supply switching-on process, the controller can perform self-protection in time, and system faults caused in the switching-on process are avoided.

Description

Technical Field

[0001] The invention relates to the field of AC electrified railway power supply, and in particular to a bilateral power supply synchronous closing device and a control method thereof. Background Art

[0002] The locomotive load of the electrified railway is a high-power single-phase load, and its traction power supply system draws power from the three-phase power grid, which causes the problem of unbalanced three-phase load to the power grid, that is, the negative sequence problem. In order to alleviate the negative sequence impact of the railway load on the power grid, the railway traction network adopts the method of rotating phase sequence along the railway line to access the voltages of different phases of the power grid, so that the uniform distribution of three-phase electricity in space can bring about a relative balance of the three-phase load. The above-mentioned power supply method of rotating phase sequence requires the traction network to increase the electrical phase separation between the power supply lines of different phases. The electrical phase separation is generally set at the exit of the traction station and the sub-division between the traction stations. Electrical phase separation will bring many disadvantages to railway operation, such as the vehicle over-phase power outage, which makes the operation cumbersome and prone to errors; the vehicle power outage affects the operating speed and safety; the electrical phase separation isolates the mutual utilization of feedback electricity, wasting electric energy.

[0003] With the increase of railway transportation volume, transportation speed and safety requirements, the drawbacks of phase separation restricting the development of railway transportation are becoming more and more obvious. Based on this, Professor Li Qunzhan's team at Southwest Jiaotong University proposed a through-type traction power supply system based on the same-phase power supply technology and the bilateral power supply technology, that is, the same-phase power supply traction station is used to eliminate the phase separation at the exit of the traction station, and the bilateral power supply technology is used to eliminate the phase separation of the substation, so as to realize the through-type power supply of the traction network without phase separation and solve the drawbacks of phase separation.

[0004] In the bilateral power supply technology, the substation is equipped with an electrical segmentation and a connecting switch. During normal operation, the connecting switch connects the power supply terminals on both sides of the adjacent traction stations together. In case of a fault, the connecting switch is disconnected to isolate the traction network fault. Before closing the connecting switch, it is necessary to determine whether the power supply of the adjacent traction stations on both sides is ready for connection; at the same time, the best time point needs to be selected for the switch closing to avoid the impact of the power connection on the power supply system; if an abnormal situation occurs during the closing process, the connecting switch should be disconnected in time to avoid abnormal conditions causing traction network failures. Summary of the invention

[0005] Based on the above situation, the present invention provides a bilateral power supply synchronous closing device and a control method. The device can detect the feeder current of the adjacent traction station, the terminal power supply voltage, and the circulating current of the bilateral power supply of the sub-station; at the same time, it can control the opening and closing of the connected switches of the sub-station. The voltage and feeder current of the adjacent traction station are used to determine whether the conditions for bilateral power supply are met; by locking the phase of the voltage at both ends, observing the synchronous state of the voltage at both ends, determining the time point when the voltage at both ends is connected, and driving the connected switch to close, bilateral power supply is achieved; in the process of closing the connected switch, the circulating current of the bilateral power supply is observed, and if the current is abnormal, the connected switch is disconnected in time to avoid causing traction network failure.

[0006] The objective of the present invention is achieved by the following technical solutions:

[0007] The first aspect of the present invention provides a bilateral power supply synchronous closing device, wherein n traction substations TS are sequentially arranged along the railway. 1 ,…,TS i TS i+1 ,…,TS n , i and n are positive integers, 1≤i≤n-1, n≥2, traction TS i Traction bus B i There is a TS for traction on the top i Left feeder F powered by left overhead contact network i,a and TS for traction i Right feeder F powered by the right overhead contact network i,b , traction station TS i+1 Traction bus B i+1 There is a TS for traction on the top i+1 Left feeder F powered by left overhead contact network i+1,a and TS for traction i+1 Right feeder F powered by the right overhead contact network i+1,b ; In the traction station TS i and traction station TS i+1 Set up partitions between SP i , Division SP i Including electrical segment SK i and the connection switch SW i , electrical segment SK i Connected in series to traction station TS i and traction station TS i+1 On the contact network between the two, connect the switch SW i With electrical segment SK i In parallel, the device includes a right feeder F i,b Current transformer CT i,b , connected in series to the left feeder F i+1,a Current transformer CT i+1,a , and the SP of the partitioni Connectivity switch SW i Current transformer CT connected in series i , and connected to traction busbar B i Voltage transformer PT i , and connected to traction busbar B i+1 Voltage transformer PT i+1 , Controller CCU i And optical fiber FO; current transformer CT i,b , Current Transformer CT i+1,a , Current Transformer CT i , Voltage Transformer PT i , Voltage Transformer PT i+1 The output terminal and the connection switch SW i The status signal end is connected to the controller CCU through the optical fiber FO i Input terminal, controller CCU i The output end is connected to the connection switch SW through the optical fiber FO i Control terminal; traction station TS i and traction station TS i+1 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected i Close the circuit breaker.

[0008] Furthermore, the traction station TS i and traction station TS i+1 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS i Traction bus B i Voltage and traction TS i+1 Traction bus B i+1 The voltage phase difference is less than the set value Dph, and the traction TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a The current is 0.

[0009] Furthermore, the voltage transformer PT i Detection of traction station TS i Traction bus B i voltage and output signal to the controller CCU i , voltage transformer PT i+1 Detection of traction station TS i+1 Traction bus B i+1 Voltage and output signal controller CCU i , current transformer CT i,b Detection of traction station TS i The right feeder F i,bCurrent and output signal to the controller CCU i , current transformer CT i+1,a Detection of traction station TS i+1 The left feeder F i+1,a Current and output signal to the controller CCU i , current transformer CT i Detection Partition SP i Connectivity switch SW i The current of the branch and output signal to the controller CCU i .

[0010] Furthermore, the controller CCU i Including a phase-locked loop for phase-locking the voltage; controller CCU i According to the voltage transformer PT i , Voltage Transformer PT i+1 , Current Transformer CT i,b , Current Transformer CT i+1,a The output signal of TS is used to determine the traction i and traction station TS i+1 Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU i The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU i Control connection switch SW i Close the circuit breaker.

[0011] Furthermore, the controller CCU i According to the current transformer CT i The output signal and the connection switch SW i The status signal of the traction station TS i and traction station TS i+1 Whether the synchronous closing of the double-sided power supply is successful, if the controller CCU i If the closing fails, the controller CCU i Control connection switch SW i Open the gate, where the traction station TS i and traction station TS i+1 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process i The detected current value is less than the set value C, and the switch SW is connected i The status signal is closed.

[0012] Furthermore, the right feeder F i,b The number of current transformers is one or more. i,b The output signal of all right feeder lines F i,b Algebraic sum of current; left feeder F i+1,aThe number of current transformers is one or more. i+1,a The output signal of all left feeder lines F i+1,a The algebraic sum of the currents.

[0013] Furthermore, the controller CCU i Installed in traction station TS i In, or installed in the traction station TS i+1 Alternatively, install it in the partition where the SP i Inside.

[0014] Furthermore, the current transformer CT i,b , Current Transformer CT i+1,a , Current Transformer CT i , Voltage Transformer PT i And voltage transformer PT i+1 The output signal is transmitted to the controller CCU i The delay does not exceed 500us.

[0015] Furthermore, the controller CCU i Drive the connection switch SW i The action delay does not exceed 80ms; the connection switch SW i The status signal is fed back to the controller CCU i The delay does not exceed 10ms.

[0016] A second aspect of the present invention provides a control method for a bilateral power supply synchronous closing device, which is applied to the bilateral power supply synchronous closing device, and comprises the following steps: i and traction station TS i+1 The synchronous closing of the bilateral power supply starts and enters S1;

[0017] S1: At the same time t, the controller CCU i According to the voltage transformer PT i and voltage transformer PT i+1 The output signal of TS is calculated respectively. i Traction bus B i Voltage phase and traction TS i+1 Traction bus B i+1 Voltage phase; controller CCU i According to the current transformer CT i,b and current transformer CT i+1,a The output signal of TS is calculated respectively. i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a Current size; continue to execute S2;

[0018] S2: Controller CCU i Determine the traction point TS i Traction bus B i Voltage phase and traction TS i+1 Traction bus B i+1 Is the voltage phase difference less than the set value Dph? If the voltage phase difference is not less than the set value Dph, the controller CCU i The phase-locked loop is ordered to continue phase-locking observation and return to execute S1; if the voltage phase difference is less than the set value Dph, continue to execute S3;

[0019] S3: Controller CCU i Determine the traction point TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a Is the current all 0? If the traction TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a If the current is not all 0, the controller CCU i The phase-locked loop continues to observe the phase lock and returns to execute S1; if the TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a If the current is 0, continue to execute S4;

[0020] S4: Traction Station TS i and traction station TS i+1 Meet the conditions for synchronous closing of bilateral power supply, controller CCU i Control connection switch SW i Close the circuit breaker and continue to execute S5;

[0021] S5: Controller CCU i According to the current transformer CT i The output signal of the current transformer CT determines the closing process i Whether the detected current value is less than the set value C, if the current transformer CT i The detected current value is less than the set value C, then execute S6; if the current transformer CT during the closing process i If the detected current value is not less than the set value C, execute S7;

[0022] S6: Controller CCU i Check the continuity switch SW i Is the status signal of the switch SW closed? iIf the status signal of switch SW is not closed, execute S7; if the switch SW is connected i If the status signal is closed, execute S8.

[0023] S7: Traction Station TS i and traction station TS i+1 The synchronous closing of the double-sided power supply fails, and the controller CCU i Control connection switch SW i Open the gate and execute S9;

[0024] S8: Traction Station TS i and traction station TS i+1 The synchronous closing of the bilateral power supply is successful, and S9 is executed;

[0025] S9: Traction Station TS i and traction station TS i+1 The synchronous closing of bilateral power supply is completed.

[0026] The beneficial effects of the present invention compared with the prior art are:

[0027] 1. Compared with blind closing of bilateral power supply, the bilateral power supply synchronous closing device and control method provided by the present invention can detect the bus voltages and feeder currents of two adjacent traction substations at the same time before the connecting switch is closed to determine whether the two traction substations have the conditions for bilateral power supply synchronous closing. This can greatly reduce the risk of bilateral power supply closing and avoid the risk of traction network failure caused by closing operation when closing conditions are not met.

[0028] 2. The bilateral power supply synchronous closing device and control method provided by the present invention connects a current transformer in series on the branch where the connecting switch of the substation is located, observes the circulating current of the bilateral power supply of the substation during the closing process, and disconnects the connecting switch in time if the current is abnormal, which can effectively avoid the risks caused by excessive circulating current and connecting switch failure during the closing process, actively implement abnormal working condition protection, and avoid causing traction network failure.

[0029] 3. The bilateral power supply synchronous closing device and control method provided by the present invention, the controller interacts with the connected switch status signal terminal and the control terminal to monitor the closing process and improve safety and reliability.

[0030] 4. Compared with the existing technology, the present invention has high automation, good safety and good practicality.

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of a bilateral power supply synchronous closing device of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure of the bilateral power supply synchronous closing device of two traction substations in Example 1 of the present invention.

[0034] Figure 3 It is a schematic diagram of the structure of the bilateral power supply synchronous closing device of three traction stations in embodiment 2 of the present invention.

[0035] Figure 4 It is a flow chart of a control method of a bilateral power supply synchronous closing device of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 1 As shown in the figure, a bilateral power supply synchronous closing device is provided with n traction substations TS in sequence along the railway. 1 ,…,TS i TS i+1 ,…,TS n , n traction stations TS 1 ,…,TS i TS i+1 ,…,TS n All of them draw electricity from the power grid and supply power to the overhead line; n-1 substations are set up along the railway in sequence. 1 , …, SP i , …, SP n-1 ; n-1 controllers CCU are set up in sequence along the railway 1 、…、CCU i 、…、CCU n-1 ; i and n are positive integers, 1≤i≤n-1, n≥2.

[0038] Among them, the traction station TS i Traction bus B i There is a TS for traction on the top i Left feeder F powered by left overhead contact network i,a and TS for traction i Right feeder F powered by the right overhead contact network i,b ; Left feeder F i,a Connect current transformer CT in series i,a , right feeder F i,b Connect current transformer CT in series i,b , traction bus B i Connect voltage transformer PT in parallel i ; Current transformer CT i,a Detection of traction station TS i The left feeder F i,aCurrent and output signal to the controller CCU i-1 , current transformer CT i,b Detection of traction station TS i The right feeder F i,b Current and output signal to the controller CCU i , voltage transformer PT i Detection of traction station TS i Traction bus B i voltage and output signal to the controller CCU i-1 or CCU i , voltage transformer PT i The output signal of the controller CCU i-1 With CCU i Shared.

[0039] Furthermore, the traction station TS i+1 Traction bus B i+1 There is a TS for traction on the top i+1 Left feeder F powered by left overhead contact network i+1,a and TS for traction i+1 Right feeder F powered by the right overhead contact network i+1,b ; Left feeder F i+1,a Connect current transformer CT in series i+1,a , right feeder F i+1,b Connect current transformer CT in series i+1,b , traction bus B i+1 Connect voltage transformer PT in parallel i+1 ; Current transformer CT i+1,a Detection of traction station TS i+1 The left feeder F i+1,a Current and output signal to the controller CCU i , current transformer CT i+1,b Detection of traction station TS i+1 The right feeder F i+1,b Current and output signal to the controller CCU i+1 , voltage transformer PT i+1 Detection of traction station TS i+1 Traction bus B i+1 voltage and output signal to the controller CCU i or CCU i+1 , voltage transformer PT i+1 The output signal of the controller CCU i With CCU i+1 Shared.

[0040] Furthermore, in the traction station TS i and traction station TS i+1 Set up partitions between SPi , Division SP i Including electrical segment SK i and the connection switch SW i , electrical segment SK i Connected in series to traction station TS i and traction station TS i+1 On the contact network between the two, connect the switch SW i With electrical segment SK i Parallel, current transformer CT i SP i Connectivity switch SW i Series connection, current transformer CT i Detection Partition SP i Connectivity switch SW i The current of the branch and output signal to the controller CCU i .

[0041] Furthermore, the current transformer CT i,b , Current Transformer CT i+1,a , Current Transformer CT i , Voltage Transformer PT i , Voltage Transformer PT i+1 The output terminal and the connection switch SW i The status signal end is connected to the controller CCU through the optical fiber FO i Input terminal, controller CCU i The output end is connected to the connection switch SW through the optical fiber FO i control terminal.

[0042] Furthermore, the traction station TS i and traction station TS i+1 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected i As an optional embodiment, the traction station TS i and traction station TS i+1 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS i Traction bus B i Voltage and traction TS i+1 Traction bus B i+1 The voltage phase difference is less than the set value Dph, and the traction TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a The current is 0.

[0043] As an optional embodiment, the controller CCU iIncluding a phase-locked loop for phase-locking the voltage; controller CCU i According to the voltage transformer PT i , Voltage Transformer PT i+1 , Current Transformer CT i,b , Current Transformer CT i+1,a The output signal of TS is used to determine the traction i and traction station TS i+1 Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU i The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU i Control connection switch SW i Close the circuit breaker.

[0044] As an optional embodiment, the controller CCU i According to the current transformer CT i The output signal and the connection switch SW i The status signal of the traction station TS i and traction station TS i+1 Whether the synchronous closing of the double-sided power supply is successful, if the controller CCU i If the closing fails, the controller CCU i Control connection switch SW i As an optional embodiment, the traction station TS i and traction station TS i+1 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process i The detected current value is less than the set value C, and the switch SW is connected i The status signal is closed.

[0045] As an optional embodiment, the right feeder line F i,b The number of current transformers is one or more. i,b The output signal of all right feeder lines F i,b Algebraic sum of current; left feeder F i+1,a The number of current transformers is one or more. i+1,a The output signal of all left feeder lines F i+1,a The algebraic sum of the currents.

[0046] As an optional embodiment, the controller CCU i Installed in traction station TS i In, or installed in the traction station TS i+1 Alternatively, install it in the partition where the SP i Inside.

[0047] As an optional embodiment, the current transformer CTi,b , Current Transformer CT i+1,a , Current Transformer CT i , Voltage Transformer PT i And voltage transformer PT i+1 The output signal is transmitted to the controller CCU i The delay does not exceed 500us.

[0048] As an optional embodiment, the controller CCU i Drive the connection switch SW i The action delay does not exceed 80ms; the connection switch SW i The status signal is fed back to the controller CCU i The delay does not exceed 10ms.

[0049] Example 1

[0050] like Figure 2 As shown, this embodiment provides a schematic diagram of the structure of two traction substation bilateral power supply synchronous closing devices, and two traction substation TS are arranged in sequence along the railway. 1 TS 2 , all of which are powered by the power grid and supply power to the overhead line; set up 1 sub-area SP 1 , Division SP 1 Located at TS 1 and traction station TS 2 Between; set 1 controller CCU 1 , optionally, the controller CCU 1 Installed in traction station TS 1 In, or installed in the traction station TS 2 Alternatively, install it in the partition where the SP 1 Inside.

[0051] Among them, the traction station TS 1 Traction bus B 1 There is a TS for traction on the top 1 Left feeder F powered by left overhead contact network 1,a and TS for traction 1 Right feeder F powered by the right overhead contact network 1,b ; Right feeder F 1,b Connect current transformer CT in series 1,b , traction bus B 1 Connect voltage transformer PT in parallel 1 ; Current transformer CT 1,b Detection of traction station TS 1 The right feeder F 1,b Current and output signal to the controller CCU 1 , voltage transformer PT 1Detection of traction station TS 1 Traction bus B 1 voltage and output signal to the controller CCU 1 .

[0052] Furthermore, the traction station TS 2 Traction bus B 2 There is a TS for traction on the top 2 Left feeder F powered by left overhead contact network 2,a and TS for traction 2 Right feeder F powered by the right overhead contact network 2,b ; Left feeder F 2,a Connect current transformer CT in series 2,a , traction bus B 2 Connect voltage transformer PT in parallel 2 ; Current transformer CT 2,a Detection of traction station TS 2 The left feeder F 2,a Current and output signal to the controller CCU 1 , voltage transformer PT 2 Detection of traction station TS 2 Traction bus B 2 voltage and output signal to the controller CCU 1 .

[0053] Furthermore, the partition SP 1 Including electrical segment SK 1 and the connection switch SW 1 , electrical segment SK 1 Connected in series to traction station TS 1 and traction station TS 2 On the contact network between the two, connect the switch SW 1 With electrical segment SK 1 Parallel, current transformer CT 1 SP 1 Connectivity switch SW 1 Series connection, current transformer CT 1 Detection Partition SP 1 Connectivity switch SW 1 The current of the branch and output signal to the controller CCU 1 .

[0054] Furthermore, the current transformer CT 1,b , Current Transformer CT 2,a , Current Transformer CT 1 , Voltage Transformer PT 1 , Voltage Transformer PT 2 The output terminal and the connection switch SW 1The status signal end is connected to the controller CCU through the optical fiber FO 1 Input terminal, controller CCU 1 The output end is connected to the connection switch SW through the optical fiber FO 1 control terminal.

[0055] Furthermore, the traction station TS 1 and traction station TS 2 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected 1 As an optional embodiment, the traction station TS 1 and traction station TS 2 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS 1 Traction bus B 1 Voltage and traction TS 2 Traction bus B 2 The voltage phase difference is less than the set value Dph, and the traction TS 1 The right feeder F 1,b Current and traction TS 2 The left feeder F 2,a The current is 0.

[0056] As an optional embodiment, the controller CCU 1 Including a phase-locked loop for phase-locking the voltage; controller CCU 1 According to the voltage transformer PT 1 , Voltage Transformer PT 2 , Current Transformer CT 1,b , Current Transformer CT 2,a The output signal of TS is used to determine the traction 1 and traction station TS 2 Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU 1 The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU 1 Control connection switch SW 1 Close the circuit breaker.

[0057] As an optional embodiment, the controller CCU 1 According to the current transformer CT 1 The output signal and the connection switch SW 1 The status signal of the traction station TS 1 and traction station TS 2 Whether the synchronous closing of the double-sided power supply is successful, if the controller CCU 1 If the closing fails, the controller CCU 1 Control connection switch SW 1As an optional embodiment, the traction station TS 1 and traction station TS 2 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process 1 The detected current value is less than the set value C, and the switch SW is connected 1 The status signal is closed.

[0058] As an optional embodiment, the current transformer CT 1,b , Current Transformer CT 2,a , Current Transformer CT 1 , Voltage Transformer PT 1 And voltage transformer PT 2 The output signal is transmitted to the controller CCU 1 The delay does not exceed 500us.

[0059] As an optional embodiment, the controller CCU 1 Drive the connection switch SW 1 The action delay does not exceed 80ms; the connection switch SW 1 The status signal is fed back to the controller CCU 1 The delay does not exceed 10ms.

[0060] Example 2

[0061] like Figure 3 As shown, this embodiment provides a schematic diagram of the structure of a three-traction station bilateral power supply synchronous closing device, and three traction stations TS are arranged in sequence along the railway. 1 TS 2 TS 3 , all of which are powered by the power grid and supply power to the overhead line; two substations SP are set up along the railway in sequence 1 , SP 2 , Division SP 1 Located at TS 1 and traction station TS 2 Between, partitions SP 2 Located at TS 2 and traction station TS 3 Two controllers CCU are set up along the railway 1 、CCU 2 , optionally, the controller CCU 1 Installed in traction station TS 1 In, or installed in the traction station TS 2 Alternatively, install it in the partition where the SP 1 Optionally, the controller CCU 2 Installed in traction station TS 2In, or installed in the traction station TS 3 Alternatively, install it in the partition where the SP 2 Inside.

[0062] Among them, the traction station TS 1 Traction bus B 1 There is a TS for traction on the top 1 Left feeder F powered by left overhead contact network 1,a and TS for traction 1 Right feeder F powered by the right overhead contact network 1,b ; Right feeder F 1,b Connect current transformer CT in series 1,b , traction bus B 1 Connect voltage transformer PT in parallel 1 ; Current transformer CT 1,b Detection of traction station TS 1 The right feeder F 1,b Current and output signal to the controller CCU 1 , voltage transformer PT 1 Detection of traction station TS 1 Traction bus B 1 voltage and output signal to the controller CCU 1 .

[0063] Furthermore, the traction station TS 2 Traction bus B 2 There is a TS for traction on the top 2 Left feeder F powered by left overhead contact network 2,a and TS for traction 2 Right feeder F powered by the right overhead contact network 2,b ; Left feeder F 2,a Connect current transformer CT in series 2,a , right feeder F 2,b Connect current transformer CT in series 2,b , traction bus B 2 Connect voltage transformer PT in parallel 2 ; Current transformer CT 2,a Detection of traction station TS 2 The left feeder F 2,a Current and output signal to the controller CCU 1 , current transformer CT 2,b Detection of traction station TS 2 The right feeder F 2,b Current and output signal to the controller CCU 2 , voltage transformer PT 2 Detection of traction station TS 2 Traction bus B 2voltage and output signal to the controller CCU 1 With CCU 2 , voltage transformer PT 2 The output signal of the controller CCU 1 With CCU 2 Shared.

[0064] Furthermore, the traction station TS 3 Traction bus B 3 There is a TS for traction on the top 3 Left feeder F powered by left overhead contact network 3,a and TS for traction 3 Right feeder F powered by the right overhead contact network 3,b ; Left feeder F 3,a Connect current transformer CT in series 3,a , traction bus B 3 Connect voltage transformer PT in parallel 3 ; Current transformer CT 3,a Detection of traction station TS 3 The left feeder F 3,a Current and output signal to the controller CCU 2 , voltage transformer PT 3 Detection of traction station TS 3 Traction bus B 3 voltage and output signal to the controller CCU 2 .

[0065] Furthermore, the partition SP 1 Including electrical segment SK 1 and the connection switch SW 1 , electrical segment SK 1 Connected in series to traction station TS 1 and traction station TS 2 On the contact network between the two, connect the switch SW 1 With electrical segment SK 1 Parallel, current transformer CT 1 SP 1 Connectivity switch SW 1 Series connection, current transformer CT 1 Detection Partition SP 1 Connectivity switch SW 1 The current of the branch and output signal to the controller CCU 1 .

[0066] Furthermore, the partition SP 2 Including electrical segment SK 2 and the connection switch SW 2 , electrical segment SK 2 Connected in series to traction station TS2 and traction station TS 3 On the contact network between the two, connect the switch SW 2 With electrical segment SK 2 Parallel, current transformer CT 2 SP 2 Connectivity switch SW 2 Series connection, current transformer CT 2 Detection Partition SP 2 Connectivity switch SW 2 The current of the branch and output signal to the controller CCU 2 .

[0067] Furthermore, the current transformer CT 1,b , Current Transformer CT 2,a , Current Transformer CT 1 , Voltage Transformer PT 1 , Voltage Transformer PT 2 The output terminal and the connection switch SW 1 The status signal end is connected to the controller CCU through the optical fiber FO 1 Input terminal, controller CCU 1 The output end is connected to the connection switch SW through the optical fiber FO 1 control terminal.

[0068] Furthermore, the current transformer CT 2,b , Current Transformer CT 3,a , Current Transformer CT 2 , Voltage Transformer PT 2 , Voltage Transformer PT 3 The output terminal and the connection switch SW 2 The status signal end is connected to the controller CCU through the optical fiber FO 2 Input terminal, controller CCU 2 The output end is connected to the connection switch SW through the optical fiber FO 2 control terminal.

[0069] Furthermore, the traction station TS 1 and traction station TS 2 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected 1 As an optional embodiment, the traction station TS 1 and traction station TS 2 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS 1 Traction bus B 1 Voltage and traction TS 2 Traction bus B 2The voltage phase difference is less than the set value Dph, and the traction TS 1 The right feeder F 1,b Current and traction TS 2 The left feeder F 2,a The current is 0.

[0070] Furthermore, the traction station TS 2 and traction station TS 3 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected 2 As an optional embodiment, the traction station TS 2 and traction station TS 3 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS 2 Traction bus B 2 Voltage and traction TS 3 Traction bus B 3 The voltage phase difference is less than the set value Dph, and the traction TS 2 The right feeder F 2,b Current and traction TS 3 The left feeder F 3,a The current is 0.

[0071] As an optional embodiment, the controller CCU 1 Including a phase-locked loop for phase-locking the voltage; controller CCU 1 According to the voltage transformer PT 1 , Voltage Transformer PT 2 , Current Transformer CT 1,b , Current Transformer CT 2,a The output signal of TS is used to determine the traction 1 and traction station TS 2 Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU 1 The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU 1 Control connection switch SW 1 Close the circuit breaker.

[0072] As an optional embodiment, the controller CCU 2 Including a phase-locked loop for phase-locking the voltage; controller CCU 2 According to the voltage transformer PT 2 , Voltage Transformer PT 3 , Current Transformer CT 2,b , Current Transformer CT 3,a The output signal of TS is used to determine the traction 2 and traction station TS 3Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU 2 The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU 2 Control connection switch SW 2 Close the circuit breaker.

[0073] As an optional embodiment, the controller CCU 1 According to the current transformer CT 1 The output signal and the connection switch SW 1 The status signal of the traction station TS 1 and traction station TS 2 Whether the synchronous closing of the double-sided power supply is successful, if the controller CCU 1 If the closing fails, the controller CCU 1 Control connection switch SW 1 As an optional embodiment, the traction station TS 1 and traction station TS 2 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process 1 The detected current value is less than the set value C, and the switch SW is connected 1 The status signal is closed.

[0074] As an optional embodiment, the controller CCU 2 According to the current transformer CT 2 The output signal and the connection switch SW 2 The status signal of the traction station TS 2 and traction station TS 3 Whether the synchronous closing of the double-sided power supply is successful, if the controller CCU 2 If the closing fails, the controller CCU 2 Control connection switch SW 2 As an optional embodiment, the traction station TS 2 and traction station TS 3 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process 2 The detected current value is less than the set value C, and the switch SW is connected 2 The status signal is closed.

[0075] As an optional embodiment, the current transformer CT 1,b , Current Transformer CT 2,a , Current Transformer CT 1 , Voltage Transformer PT 1 And voltage transformer PT 2 The output signal is transmitted to the controller CCU 1The time delay of the current transformer CT does not exceed 500us; 2,b , Current Transformer CT 3,a , Current Transformer CT 2 , Voltage Transformer PT 2 And voltage transformer PT 3 The output signal is transmitted to the controller CCU 2 The delay does not exceed 500us.

[0076] As an optional embodiment, the controller CCU 1 Drive the connection switch SW 1 The action delay does not exceed 80ms; the connection switch SW 1 The status signal is fed back to the controller CCU 1 The delay does not exceed 10ms; the controller CCU 2 Drive the connection switch SW 2 The action delay does not exceed 80ms; the connection switch SW 2 The status signal is fed back to the controller CCU 2 The delay does not exceed 10ms.

[0077] like Figure 4 As shown, the present invention is based on Figure 1 A control method for a bilateral power supply synchronous closing device is provided, comprising the following steps: TS i and traction station TS i+1 The synchronous closing of the bilateral power supply starts and enters S1;

[0078] S1: At the same time t, the controller CCU i According to the voltage transformer PT i and voltage transformer PT i+1 The output signal of TS is calculated respectively. i Traction bus B i Voltage phase and traction TS i+1 Traction bus B i+1 Voltage phase; controller CCU i According to the current transformer CT i,b and current transformer CT i+1,a The output signal of TS is calculated respectively. i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a Current size; continue to execute S2;

[0079] S2: Controller CCU i Determine the traction point TS i Traction bus B iVoltage phase and traction TS i+1 Traction bus B i+1 Is the voltage phase difference less than the set value Dph? If the voltage phase difference is not less than the set value Dph, the controller CCU i The phase-locked loop is ordered to continue phase-locking observation and return to execute S1; if the voltage phase difference is less than the set value Dph, continue to execute S3;

[0080] S3: Controller CCU i Determine the traction point TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a Is the current all 0? If the traction TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a If the current is not all 0, the controller CCU i The phase-locked loop continues to observe the phase lock and returns to execute S1; if the TS i The right feeder F i,b Current and traction TS i+1 The left feeder F i+1,a If the current is 0, continue to execute S4;

[0081] S4: Traction Station TS i and traction station TS i+1 Meet the conditions for synchronous closing of bilateral power supply, controller CCU i Control connection switch SW i Close the circuit breaker and continue to execute S5;

[0082] S5: Controller CCU i According to the current transformer CT i The output signal of the current transformer CT determines the closing process i Whether the detected current value is less than the set value C, if the current transformer CT i The detected current value is less than the set value C, then execute S6; if the current transformer CT during the closing process i If the detected current value is not less than the set value C, execute S7;

[0083] S6: Controller CCU i Check the continuity switch SW i Is the status signal of the switch SW closed? i If the status signal of switch SW is not closed, execute S7; if the switch SW is connected i If the status signal is closed, execute S8.

[0084] S7: Traction Station TS i and traction station TS i+1 The synchronous closing of the double-sided power supply fails, and the controller CCU i Control connection switch SW i Open the circuit breaker, analyze the reasons for the failure of the synchronous closing of the bilateral power supply, and execute S9;

[0085] S8: Traction Station TS i and traction station TS i+1 The synchronous closing of the bilateral power supply is successful, and S9 is executed;

[0086] S9: Traction Station TS i and traction station TS i+1 The synchronous closing of bilateral power supply is completed.

[0087] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A bilateral power supply synchronous closing device, n traction stations TS1, ..., TS i TS i+1 ,...,TS n , i and n are positive integers, 1≤i≤n-1, n≥2, traction TS i Traction bus B i There is a TS for traction on the top i Left feeder F powered by left overhead contact network i，a and TS for traction i Right feeder F powered by the right overhead contact network i，b , traction station TS i+1 Traction bus B i+1 There is a TS for traction on the top i+1 Left feeder F powered by left overhead contact network i+1，a and TS for traction i+1 Right feeder F powered by the right overhead contact network i+1，b ; In the traction station TS i and traction station TS i+1 Set up partitions between SP i , the partition SP i Including electrical segment SK i and the connection switch SW i , the electrical segment SK i Connected in series to traction station TS i and traction station TS i+1 On the contact network between the two, connect the switch SW i With electrical segment SK i Parallel connection, characterized by: The device includes a right feeder line F i，b Current transformer CT i,b , connected in series to the left feeder F i+1，a Current transformer CT i+1，a , and the SP of the partition i Connectivity switch SW i Current transformer CT connected in series i , and connected to traction busbar B i Voltage transformer PT i , and connected to traction busbar B i+1 Voltage transformer PT i+1 , Controller CCU i and optical fiber FO; the current transformer CT i,b , Current Transformer CT i+1，a , Current Transformer CT i , Voltage Transformer PT i , Voltage Transformer PT i+1 The output terminal and the connection switch SW i The status signal end is connected to the controller CCU through the optical fiber FO i The input terminal of the controller CCU i The output end is connected to the connection switch SW through the optical fiber FO i Control terminal; traction station TS i and traction station TS i+1 When the conditions for synchronous closing of double-sided power supply are met, switch SW is connected i Close the circuit breaker.

2. A bilateral power supply synchronous closing device according to claim 1, characterized in that: Traction Station TS i and traction station TS i+1 The conditions for the synchronous closing of bilateral power supply are: at the same time, the traction substation TS i Traction bus B i Voltage and traction TS i+1 Traction bus B i+1 The voltage phase difference is less than the set value Dph, and the traction TS i The right feeder F i，b Current and traction TS i+1 The left feeder F i+1，a The current is 0.

3. A bilateral power supply synchronous closing device according to claim 2, characterized in that: Voltage Transformer PT i Detection of traction station TS i Traction bus B i voltage and output signals to the controller CCU i , voltage transformer PT i+1 Detection of traction station TS i+1 Traction bus B i+1 voltage and output signals to the controller CCU i , current transformer CT i,b Detection of traction station TS i The right feeder F i，b current and output signals to the controller CCU i , current transformer CT i+1，a Detection of traction station TS i+1 The left feeder F i+1，a current and output signals to the controller CCU i , current transformer CT i Detection Partition SP i Connectivity switch SW i The current in the branch and output signals to the controller CCU i .

4. A bilateral power supply synchronous closing device according to claim 3, characterized in that: The controller CCU i A phase-locked loop is included for phase-locking the voltage; the controller CCU i According to the voltage transformer PT i , Voltage Transformer PT i+1 , Current Transformer CT i,b , Current Transformer CT i+1，a The output signal of TS is used to determine the traction i and traction station TS i+1 Whether the conditions for synchronous closing of bilateral power supply are met, if not, the controller CCU i The phase-locked loop continues to observe the phase lock. If the condition is satisfied, the controller CCU i Control connection switch SW i Close the circuit breaker.

5. A bilateral power supply synchronous closing device according to claim 4, characterized in that: The controller CCU i According to the current transformer CT i The output signal and the connection switch SW i The status signal of the traction station TS i and traction station TS i+1 Whether the double-sided power supply synchronous closing is successful, if the controller CCU i If the closing fails, the controller CCU i Control connection switch SW i Open the gate, where the traction station TS i and traction station TS i+1 The successful closing of the bilateral power supply synchronously requires the following conditions to be met at the same time: the current transformer CT during the closing process i The detected current value is less than the set value C, and the switch SW is connected i The status signal is closed.

6. A bilateral power supply synchronous closing device according to any one of claims 1 to 5, characterized in that: The right feeder line F i，b The number of current transformers is one or more. i,b The output signal of all right feeder lines F i，b The algebraic sum of the current; the left feeder F i+1，a The number of current transformers is one or more. i+1，a The output signal of all left feeder lines F i+1，a The algebraic sum of the currents.

7. A bilateral power supply synchronous closing device according to any one of claims 1 to 5, characterized in that: The controller CCU i Installed in traction station TS i In, or installed in the traction station TS i+1 Alternatively, install it in the partition where the SP i Inside.

8. A bilateral power supply synchronous closing device according to any one of claims 1 to 5, characterized in that: The current transformer CT i,b , Current Transformer CT i+1，a , Current Transformer CT i , Voltage Transformer PT i And voltage transformer PT i+1 The output signal is transmitted to the controller CCU i The delay does not exceed 500us.

9. A bilateral power supply synchronous closing device according to any one of claims 1 to 5, characterized in that: The controller CCU i Drive the connection switch SW i The action delay does not exceed 80ms; the connection switch SW i The status signal is fed back to the controller CCU i The delay does not exceed 10ms.

10. A control method for a bilateral power supply synchronous closing device, applied to the bilateral power supply synchronous closing device according to any one of claims 1 to 9, comprising the following steps: TS i and traction station TS i+1 The synchronous closing of the bilateral power supply starts and enters S1; S1: At the same time t, the controller CCU i According to the voltage transformer PT i and voltage transformer PT i+1 The output signal of TS is calculated respectively. i Traction bus B i Voltage phase and traction TS i+1 Traction bus B i+1 Voltage phase; controller CCU i According to the current transformer CT i,b and current transformer CT i+1，a The output signal of TS is calculated respectively. i The right feeder F i，b Current and traction TS i+1 The left feeder F i+1，a Current size; continue to execute S2; S2: Controller CCU i Determine the traction point TS i Traction bus B i Voltage phase and traction TS i+1 Traction bus B i+1 Is the voltage phase difference less than the set value Dph? If the voltage phase difference is not less than the set value Dph, the controller CCU i The phase-locked loop is ordered to continue phase-locking observation and return to execute S1; if the voltage phase difference is less than the set value Dph, continue to execute S3; S3: Controller CCU i Determine the traction point TS i The right feeder F i，b Current and traction TS i+1 The left feeder F i+1，a Is the current all O? If the traction TS i The right feeder F i，b Current and traction TS i+1 The left feeder F i+1，a If the current is not all 0, the controller CCU i The phase-locked loop continues to observe the phase lock and returns to execute S1; if the TS i The right feeder F i，b Current and traction TS i+1 The left feeder F i+1，a If the current is 0, continue to execute S4; S4: Traction Station TS i and traction station TS i+1 Meet the conditions for synchronous closing of bilateral power supply, controller CCU i Control connection switch SW i Close the circuit breaker and continue to execute S5; S5: Controller CCU i According to the current transformer CT i The output signal of the current transformer CT determines the closing process i Whether the detected current value is less than the set value C, if the current transformer CT i The detected current value is less than the set value C, then execute S6; if the current transformer CT during the closing process i If the detected current value is not less than the set value C, execute S7; S6: Controller CCU i Check the continuity switch SW i Is the status signal of the switch SW closed? i If the status signal of switch SW is not closed, execute S7; if the switch SW is connected i If the status signal is closed, execute S8. S7: Traction Station TS i and traction station TS i+1 The synchronous closing of the double-sided power supply fails, and the controller CCU i Control connection switch SW i Open the gate and execute S9; S8: Traction Station TS i and traction station TS i+1 The synchronous closing of the bilateral power supply is successful, and S9 is executed; S9: Traction Station TS i and traction station TS i+1 The synchronous closing of bilateral power supply is completed.

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