Multi-source long-distance traction power supply system power supply capacity adjustment optimization method and system

Abstract

The application discloses a multi-source long-distance traction power supply system power supply capacity adjustment optimization method and system, and the method comprises the following steps: acquiring voltage and current data at a feeder line of each traction substation, AT substation and AT subarea substation to form an electrical information matrix; determining a system voltage optimization threshold U p , a voltage limit threshold U t , and a voltage limit threshold U c ; determining the lowest voltage U min in each power supply arm according to the formed electrical information matrix; determining the lowest voltage U min according to the threshold; respectively performing system voltage level improvement optimization and efficiency utilization optimization; and checking the threshold according to the system voltage level improvement optimization and efficiency utilization optimization results. The method and system provided by the application significantly prolong the power supply distance between adjacent traction substations, balance the load distribution of the two adjacent traction substations, promote the effective utilization of regenerative braking energy, and effectively improve the efficiency level and operation quality of the long-distance traction power supply system across the strait.

Description

Technical Field

[0001] This invention belongs to the field of traction power supply capacity adjustment technology, and particularly relates to a method and system for adjusting and optimizing the power supply capacity of a multi-source long-distance traction power supply system. Background Technology

[0002] my country's traction power supply system adopts a 25kV single-phase AC power supply system. AC power traction railway transportation systems all use overhead contact lines to supply power to trains, with separate electrical phases between adjacent power supply arms. Power is supplied independently by traction substations and power supply arms on one side, and the power supply distance is limited by the voltage at the end of the contact line. In recent years, with the continuous development of high-speed railway construction in my country, the proportion of long tunnel sections has gradually increased due to external environmental factors such as the terrain conditions of the lines. Many deep-buried long-distance cross-strait railway projects have also gradually entered the preliminary research stage. Unlike the conventional design of high-speed railways where the distance between two adjacent traction substations is about 50 to 60 kilometers, the cross-sea section of deep-buried long-distance strait passages can typically reach over 100 km, exceeding the limit for setting up traction substations on land at both ends of the strait. To date, there are no operational examples of deep-buried electrified railways crossing straits in my country, placing higher demands on the operational capacity and safety of the traction power supply system. With the introduction of the multi-source traction power supply system topology, trains can transform from single-energy unidirectional supply to multi-source collaborative operation mode, providing a new approach to improve system power supply capacity and power flow optimization, expanding the power supply range of traction substations and power supply arms, and effectively improving the efficiency and operational quality of long-distance traction power supply systems across straits. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a method and system for adjusting and optimizing the power supply capacity of a multi-source long-distance traction power supply system, thereby improving the power supply capacity and power flow optimization of the AC-based long-distance traction power supply system and enhancing the power supply capacity and efficiency of traction substations. Specifically, based on a multi-source power supply structure with multiple AT substation power supply topology and power integration device, a voltage regulation power flow optimization control strategy is formed by setting voltage optimization threshold, voltage limit threshold, and voltage limit threshold. This enables the traction power supply system to have autonomous adjustment capabilities, allowing it to adjust its power supply capacity in real time according to the changing trend of traction load. This achieves dynamic adaptation between the traction power supply system and train operation organization, optimizes the grid voltage at the end of the power supply arm in the long-distance power supply mode, balances the load distribution between two adjacent traction substations, promotes the effective utilization of regenerative braking energy, and improves the efficiency and operational quality of the cross-strait long-distance traction power supply system.

[0004] The present invention adopts the following technical solution:

[0005] A method for adjusting and optimizing the power supply capacity of a multi-source long-distance traction power supply system, wherein the power supply system includes several traction substations, AT sectioning stations and power sharing devices are set between adjacent traction substations, and several AT stations are set between traction substations and AT sectioning stations; the method includes the following steps:

[0006] Obtain power supply arm length data of traction substations along electrified railway lines to form a line structure information matrix. ;in, Let x be the length of the x-th power supply arm;

[0007] Obtain the length data of the AT section within the power supply arm along the electrified railway line to form a power supply arm structure information matrix. ;in, The length between the traction substation (starting point of the power supply arm) and the first AT substation within the first power supply arm. The length between the first AT station and the second AT station within the first power supply arm. The length between the m-th AT station and the AT section station (end of the power supply arm) within the first power supply arm, where m represents the total number of AT stations within the first power supply arm; The length between the traction substation (starting point of the power supply arm) within the second power supply arm and the first AT substation. The length between the first AT station and the second AT station within the second power supply arm. This is the length between the nth AT station and the AT substation (end of the power supply arm) within the second power supply arm, where n represents the total number of AT stations within the second power supply arm. Let x be the length between the traction substation (starting point of the power supply arm) within the x-th power supply arm and the first AT substation. Let x be the length between the first AT station and the second AT station within the x-th power supply arm. Let q be the length between the q-th AT station and the AT section station (end of the power supply arm) within the x-th power supply arm, where q represents the total number of AT stations within the x-th power supply arm; the total number of AT stations within each power supply arm may not be exactly the same.

[0008] Obtain voltage and current data at the feeders of each traction substation, AT substation, and AT section substation to form an electrical information matrix: ;in, The voltage at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. This refers to the voltage at the feed line of the first AT unit within the first power supply arm. The voltage at the feed line of the m-th AT within the first power supply arm. This indicates the voltage at the feeder of the AT section (end of the power supply arm) within the first power supply arm; Let be the voltage at the feeder of the traction substation (starting point of the power supply arm) within the x-th power supply arm. Let be the voltage at the feed line of the first AT within the x-th power supply arm. Let be the voltage at the feed line of the qth AT within the xth power supply arm. This represents the voltage at the feeder of the AT section (end of the power supply arm) within the x-th power supply arm; This refers to the current at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. This refers to the current at the feeder of the first AT unit within the first power supply arm. This refers to the current at the feeder of the m-th AT within the first power supply arm. This indicates the current at the feeder of the AT section (end of the power supply arm) within the first power supply arm; Let be the current at the feeder of the traction substation (starting point of the power supply arm) within the x-th power supply arm. Let be the current at the feeder of the first AT in the xth power supply arm. Let be the current at the feeder of the q-th AT within the x-th power supply arm. This represents the current at the feeder of the AT section (end of the power supply arm) within the xth power supply arm;

[0009] Determine the system voltage optimization threshold U p Voltage limiting threshold U t Voltage limit threshold U c The minimum voltage U in each power supply arm is determined based on the formed electrical information matrix. min Based on the threshold and the minimum voltage U min System voltage level improvement optimization and efficiency utilization optimization are carried out respectively;

[0010] The method for improving and optimizing system voltage levels is as follows:

[0011] If the lowest voltage U in the power supply arm min t First, check whether all AT stations in the power supply arm are in operation and whether the up and down lines in the power supply arm are fully connected in parallel. If not all are in operation or the up and down lines are not connected in parallel, then all AT stations need to be in operation and the up and down parallel switches need to be closed to enter the optimal impedance operation mode.

[0012] If the lowest voltage U in the power supply arm min t If the system has entered the optimal impedance operation mode, the system closes the bilateral interconnection switch in the adjacent section of the power supply arm and controls the power flow through the power fusion device, and the system enters the bilateral operation state.

[0013] After the system enters the dual-side operation state, it continues to monitor the voltage in real time and adjusts and optimizes the system voltage level in real time. ​​

[0014] The method for optimizing system performance utilization is as follows:

[0015] When U min >U p The two power supply arms between two adjacent traction substations are considered as a power supply unit. The voltage and real-time load changes of the system are continuously monitored. Based on the real-time load of the traction transformer of the left traction substation or / and the real-time load of the traction transformer of the right traction substation in the power supply unit, the power flow is controlled by the power fusion device to improve the overall efficiency of the traction power supply system.

[0016] Based on the optimization results of system voltage level improvement and efficiency utilization, the system voltage optimization threshold U is set. p Voltage limiting threshold U t Perform verification.

[0017] Furthermore, after the system enters dual-side operation mode, the method for continuing to monitor the voltage in real time and optimizing the system voltage level in real time is as follows:

[0018] Assuming two power supply arms between two adjacent traction substations constitute one power supply unit, the lowest voltage within the left power supply arm is U. min1 The lowest voltage in the right power supply arm is U. min2 If the U-shaped distance between two adjacent traction substations t min1 p or U t min2 p The system is already in a two-sided operating state, and this state will be maintained. Frequent switching of the system's operating state will be avoided through hysteresis comparison. Real-time monitoring of voltage and the real-time load of the power supply unit will continue. When U... min1 >U p U min2 >U p And the real-time load S of the power supply unit is less than 0.5S. max At that time, disconnect the bilateral interconnection switch within the substation to restore the optimal impedance operation mode; among which, S max This represents the system load of the power supply unit. Based on this, if the power supply arm becomes unloaded, that is, when the real-time load of the power supply unit S=0, the reinforcement AT station will be decommissioned and the normal operation mode will be entered, with only the AT station in the middle of the power supply arm and the section station at the end of the power supply arm remaining in operation.

[0019] If the system enters a two-sided operation state, and U c min t The system enters a low-voltage alarm state and continuously monitors the lowest voltage U in real time. min ​​​​​​If the change persists for more than 300 seconds, the system will enter fault mode and the number of train trips will need to be limited.

[0020] If the system enters a two-sided operation state, and U min c The system enters a low-voltage alarm state and continuously monitors the lowest voltage U in real time. min If the change persists for more than 60 seconds, the system will enter fault mode and the number of train trips will need to be limited.

[0021] Furthermore, if the lowest voltage U in the power supply arm min t If the system has entered the optimal impedance operation mode, then the method for closing the bilateral interconnection switch in the adjacent section of the power supply arm and controlling the power flow through the power facilitation device is as follows:

[0022] Assuming two power supply arms between two adjacent traction substations constitute one power supply unit, the lowest voltage within the left power supply arm is U. min1 The lowest voltage in the right power supply arm is U. min2 , when U min1 min2 At that time, the power flow direction of the control power fusion device is from the right power supply arm to the left power supply arm; when U min1 >U min2 At that time, the power flow direction of the control power fusion device is from the left power supply arm to the right power supply arm.

[0023] Furthermore, the system load S of the power supply unit max The definition method is as follows:

[0024] When the lowest voltage U in the power supply arm min t Furthermore, the system has entered the optimal impedance operating mode, and the system has closed the bilateral interconnection switch in the adjacent section of the power supply arm. The system load S of the power supply unit is... max It is the sum of the loads of the traction transformers at the left and right traction substations within the power supply unit.

[0025] Furthermore, based on the optimization results of system voltage level improvement and efficiency utilization, the system voltage optimization threshold U is set. p Voltage limiting threshold U t When performing the verification, the power supply voltage regulation stability coefficient and the power supply capacity enhancement depth coefficient need to be considered; among them,

[0026] Power supply voltage regulation stability coefficient μ=(U p -U t ) / (U n -U t ​​​​), where U n The voltage rating represents the rated voltage of the traction power supply system; the power supply voltage regulation stability coefficient characterizes the system's ability to operate stably in response to traction network voltage fluctuations during power supply capacity adjustment. A larger value indicates a higher hysteresis comparison window voltage (U). p -U t The larger the value, the fewer times the system switches operating modes during power supply capacity adjustment, and the more stable the operating status.

[0027] According to the generally accepted standards for the power supply voltage regulation stability coefficient μ by those skilled in the art, a μ ≥ 70% indicates strong system stability during power supply capacity regulation; 15% ≤ μ < 70% indicates moderate system stability during power supply capacity regulation; and μ < 15% indicates weak system stability during power supply capacity regulation. In actual operation, it is recommended to use a moderate and stable threshold setting; if the system has high requirements for voltage regulation capability, the μ value can be appropriately reduced.

[0028] Power supply capability enhancement depth coefficient β=(U av -U t ) / (U p -U t ), where U av The system's daily minimum voltage fluctuation probability value is 95%; the power supply capacity enhancement depth coefficient characterizes the voltage optimization threshold U. p The higher the value of the matching with the actual operation of the system, the better the matching degree of the system with the optimization and adjustment of the power supply capacity.

[0029] According to the generally accepted criteria for the power supply capability enhancement depth coefficient β among those skilled in the art, when β ≥ 80%, the system's regulation depth matching degree is excellent; when 30% ≤ β < 80%, the system's regulation depth matching degree is good; when β < 30%, the system's regulation depth matching degree is insufficient, and the voltage optimization threshold U should be readjusted. p If the β value matching is good or insufficient, it is recommended to readjust the voltage optimization threshold U. p Voltage limiting threshold U t The settings are adjusted to better match the actual operating conditions of the system.

[0030] Furthermore, based on the real-time load of the traction transformer at the left traction substation within the power supply unit and / or the real-time load of the traction transformer at the right traction substation within the power supply unit, and in conjunction with the power fusion device controlling the power flow direction, the method for improving the overall efficiency of the traction power supply system is as follows:

[0031] If U min >U pEach power supply unit is defined as one of the two power supply arms between two adjacent traction substations. Voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation within the power supply unit exceeds 2·S... 1N The system closes the bilateral interconnection switch within the substation of the power supply unit and controls the power flow from the right power supply arm to the left power supply arm through the power facilitation device to prevent the system from continuously operating under overload conditions; where S 1N This represents the rated power value of the left-side traction transformer;

[0032] If U min >U p Each power supply unit is defined as one of the two power supply arms between two adjacent traction substations. Voltage and system load changes are continuously monitored in real time. If the real-time load S2 of the traction transformer in the right-hand traction substation within the power supply unit exceeds 2·S... 2N The system closes the bilateral interconnection switch within the substation of the power supply unit and controls the power flow from the left power supply arm to the right power supply arm through the power facilitation device to prevent the system from continuously operating under overload conditions; where S 2N This represents the rated power value of the traction transformer on the right side;

[0033] If U min >U p The two power supply arms between two adjacent traction substations are considered as a power supply unit. The voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation is less than 0 and the real-time load S2 of the traction transformer in the right traction substation is greater than 0, the system closes the double-sided interconnection switch in the substation and controls the power flow from the left power supply arm to the right power supply arm through the power fusion device. This fully utilizes the regenerative braking energy in the adjacent power supply arms, reduces the risk of overvoltage in the system, and improves the overall efficiency of the traction power supply system.

[0034] If U min >U p The system treats the two power supply arms between two adjacent traction substations as a single power supply unit, continuously monitoring voltage and system load changes in real time. If the real-time load S1 of the traction transformer in the left traction substation is greater than 0 and the real-time load S2 of the traction transformer in the right traction substation is less than 0, the system closes the bilateral interconnection switch within the substation and controls the flow of power from the right power supply arm to the left power supply arm through the power fusion device. This fully utilizes the regenerative braking energy within the adjacent power supply arms, reduces the risk of overvoltage in the system, and improves the overall efficiency of the traction power supply system.

[0035] Furthermore, methods for optimizing system performance utilization also include:

[0036] If U min >U pThe two power supply arms between two adjacent traction substations are considered as one power supply unit. The voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation is less than or equal to 0 and the real-time load S2 of the traction transformer in the right traction substation is less than or equal to 0, the system disconnects the double-sided interconnection switch in the substation and withdraws the reinforced AT substation. Only the AT substation in the middle of the power supply arm and the substation at the end of the power supply arm are put into operation and run in the conventional mode to avoid the occurrence of equalization current and the impact on power quality of the external power supply system.

[0037] If U min >U p The two power supply arms between two adjacent traction substations are considered as one power supply unit. Voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer at the left traction substation exceeds 3·S... 1N Or, the real-time load S2 of the traction transformer at the right-side traction substation exceeds 3·S. 2N If the state persists for more than 120 seconds, the system will enter fault mode and the number of train pairs will need to be limited.

[0038] This invention also provides a power supply capacity adjustment and optimization system for a multi-source long-distance traction power supply system. The power supply system includes several traction substations, with AT (Automatic Transmission) sectioning stations and power sharing devices installed between adjacent traction substations, and several AT stations installed between the traction substations and the AT sectioning stations. The system includes:

[0039] The line structure information matrix acquisition module is used to acquire power supply arm length data of traction substations along electrified railways and form a line structure information matrix. ;in, Let x be the length of the x-th power supply arm;

[0040] The power supply arm structure information matrix acquisition module is used to acquire the AT section length data within the power supply arm along the electrified railway line and form a power supply arm structure information matrix. ;in, The length between the traction substation and the first AT station within the first power supply arm. The length between the first AT station and the second AT station within the first power supply arm. This is the length between the m-th AT station and the AT substation within the first power supply arm, where m represents the total number of AT stations within the first power supply arm; This is the length between the nth AT station and the AT substation within the second power supply arm, where n represents the total number of AT stations within the second power supply arm. Let q be the length between the q-th AT station and the AT substation within the x-th power supply arm, where q represents the total number of AT stations within the x-th power supply arm.

[0041] The electrical information matrix acquisition module is used to acquire voltage and current data at the feeders of each traction substation, AT substation, and AT section substation, forming an electrical information matrix. ;in, This refers to the voltage at the feeder of the traction substation within the first power supply arm. This refers to the voltage at the feed line of the first AT unit within the first power supply arm. The voltage at the feed line of the m-th AT within the first power supply arm. This indicates the voltage at the feeder of the AT section within the first power supply arm; Let be the voltage at the feeder of the traction substation within the x-th power supply arm. Let be the voltage at the feed line of the first AT within the x-th power supply arm. This represents the voltage at the feeder of the AT section within the x-th power supply arm; This refers to the current at the feeder of the traction substation within the first power supply arm. This refers to the current at the feeder of the first AT unit within the first power supply arm. This refers to the current at the feeder of the m-th AT within the first power supply arm. This indicates the current at the feeder of the AT section within the first power supply arm; Let be the current at the feeder of the traction substation within the x-th power supply arm. Let be the current at the feeder of the first AT in the xth power supply arm. Let be the current at the feeder of the q-th AT within the x-th power supply arm. This represents the current at the feeder of the AT section within the x-th power supply arm;

[0042] The system voltage level enhancement and efficiency utilization optimization module is used to determine the system voltage optimization threshold U. p Voltage limiting threshold U t Voltage limit threshold U c The minimum voltage U in each power supply arm is determined based on the formed electrical information matrix. min Based on the threshold and the minimum voltage U min System voltage level improvement optimization and efficiency utilization optimization are carried out respectively;

[0043] The method for improving and optimizing system voltage levels is as follows:

[0044] If the lowest voltage U in the power supply arm min t First, check whether all AT stations in the power supply arm are in operation and whether the up and down lines in the power supply arm are fully connected in parallel. If not all are in operation or the up and down lines are not connected in parallel, then all AT stations need to be in operation and the up and down parallel switches need to be closed to enter the optimal impedance operation mode.

[0045] If the lowest voltage U in the power supply arm min <U​t If the system has entered the optimal impedance operation mode, the system closes the bilateral interconnection switch in the adjacent section of the power supply arm and controls the power flow through the power fusion device, and the system enters the bilateral operation state.

[0046] After the system enters the dual-side operation state, it continues to monitor the voltage in real time and adjusts and optimizes the system voltage level in real time.

[0047] The method for optimizing system performance utilization is as follows:

[0048] When U min >U p The two power supply arms between two adjacent traction substations are considered as a power supply unit. The voltage and real-time load changes of the system are continuously monitored. Based on the real-time load of the traction transformer of the left traction substation or / and the real-time load of the traction transformer of the right traction substation in the power supply unit, the power flow is controlled by the power fusion device to improve the overall efficiency of the traction power supply system.

[0049] The threshold verification module is used to set the system voltage optimization threshold U based on the system voltage level improvement optimization and efficiency utilization optimization results. p Voltage limiting threshold U t Perform verification.

[0050] Furthermore, the present invention adopts the following technical solution:

[0051] A non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the power supply capacity adjustment and optimization method for a multi-source long-distance traction power supply system as described above.

[0052] Furthermore, the present invention adopts the following technical solution:

[0053] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the power supply capacity adjustment and optimization method for a multi-source long-distance traction power supply system as described above.

[0054] The beneficial technical effects of this invention are as follows:

[0055] This invention relates to a multi-source power supply structure based on a multi-AT power supply topology and a power integration device. By setting voltage optimization thresholds, voltage limit thresholds, and voltage limit thresholds, a voltage regulation power flow optimization control strategy is formed, enabling the multi-source traction power supply system to have autonomous adjustment capabilities. The power supply capacity is adjusted in real time according to the traction load change trend, realizing dynamic adaptation between the traction power supply system and train operation organization. It optimizes the grid voltage at the end of the power supply arm in the long-distance power supply mode, significantly improves the power supply distance between adjacent traction substations, balances the load distribution of two adjacent traction substations, promotes the effective utilization of regenerative braking energy, and improves the efficiency and operation quality of the cross-strait long-distance traction power supply system. Attached Figure Description

[0056] Figure 1 This is a structural diagram of the conventional operation mode of the multi-source long-distance traction power supply system provided in the embodiments of the present invention;

[0057] Figure 2 This is a structural diagram of the optimal impedance operation mode of the multi-source long-distance traction power supply system provided in the embodiments of the present invention;

[0058] Figure 3 This is a structural diagram of the double-sided interconnection switch of the closed section of the multi-source long-distance traction power supply system provided in the embodiments of the present invention;

[0059] Figure 4 This is a schematic diagram of power scheduling for a multi-source long-distance traction power supply system provided in an embodiment of the present invention, with the power flow direction from right to left;

[0060] Figure 5 This is a schematic diagram of power scheduling for a multi-source long-distance traction power supply system provided in an embodiment of the present invention, with the power flow direction from left to right;

[0061] Figure 6 This is a schematic diagram of the power supply capacity adjustment process of the multi-source long-distance traction power supply system provided in the embodiment of the present invention. Detailed Implementation

[0062] The following, in conjunction with the accompanying drawings, provides a clearer and more complete description of the power supply capacity adjustment and optimization method and system for a multi-source long-distance traction power supply system provided by the present invention:

[0063] Example 1

[0064] The present invention provides a method for adjusting and optimizing the power supply capacity of a multi-source long-distance traction power supply system. The power supply system includes several traction substations, with AT (Automatic Transmission) substations and power sharing devices installed between adjacent traction substations, and several AT stations installed between the traction substations and the AT substations. The method includes the following steps:

[0065] Obtain power supply arm length data of traction substations along electrified railway lines to form a line structure information matrix. ;in, Let x be the length of the x-th power supply arm;

[0066] Obtain the length data of the AT section within the power supply arm along the electrified railway line to form a power supply arm structure information matrix. ;in, The length between the traction substation (starting point of the power supply arm) and the first AT substation within the first power supply arm. The length between the first AT station and the second AT station within the first power supply arm. The length between the m-th AT station and the AT section station (end of the power supply arm) within the first power supply arm, where m represents the total number of AT stations within the first power supply arm; The length between the traction substation (starting point of the power supply arm) within the second power supply arm and the first AT substation. The length between the first AT station and the second AT station within the second power supply arm. This is the length between the nth AT station and the AT substation (end of the power supply arm) within the second power supply arm, where n represents the total number of AT stations within the second power supply arm. Let x be the length between the traction substation (starting point of the power supply arm) within the x-th power supply arm and the first AT substation. Let x be the length between the first AT station and the second AT station within the x-th power supply arm. Let q be the length between the q-th AT station and the AT section station (end of the power supply arm) within the x-th power supply arm, where q represents the total number of AT stations within the x-th power supply arm; the total number of AT stations within each power supply arm may not be exactly the same.

[0067] Obtain voltage and current data at the feeders of each traction substation, AT substation, and AT section substation to form an electrical information matrix:

[0068] ;in, The voltage at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. This refers to the voltage at the feed line of the first AT unit within the first power supply arm. The voltage at the feed line of the m-th AT within the first power supply arm. This indicates the voltage at the feeder of the AT section (end of the power supply arm) within the first power supply arm; Let be the voltage at the feeder of the traction substation (starting point of the power supply arm) within the x-th power supply arm. Let be the voltage at the feed line of the first AT within the x-th power supply arm. Let be the voltage at the feed line of the qth AT within the xth power supply arm. This represents the voltage at the feeder of the AT section (end of the power supply arm) within the x-th power supply arm; This refers to the current at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. This refers to the current at the feeder of the first AT unit within the first power supply arm. This refers to the current at the feeder of the m-th AT within the first power supply arm. This indicates the current at the feeder of the AT section (end of the power supply arm) within the first power supply arm; Let be the current at the feeder of the traction substation (starting point of the power supply arm) within the x-th power supply arm. Let be the current at the feeder of the first AT in the xth power supply arm. Let be the current at the feeder of the q-th AT within the x-th power supply arm. This represents the current at the feeder of the AT section (end of the power supply arm) within the xth power supply arm. It should be noted that the arrangement of voltage and current data in the electrical information matrix formed in this step needs to be coordinated with the structural information matrix formed by the AT segment length data within the power supply arm. This way, in the subsequent process of optimizing system voltage level and improving efficiency utilization, the line section where the system voltage is lower than the threshold voltage, as well as the power supply section for adjusting power supply capacity and optimizing system efficiency, can be quickly located, making it easier for operation and maintenance personnel to quickly identify the system operating status and fault location.

[0069] Determine the system voltage optimization threshold U p Voltage limiting threshold U t Voltage limit threshold U c The minimum voltage U in each power supply arm is determined based on the formed electrical information matrix. min Based on the threshold and the minimum voltage U min System voltage level improvement optimization and efficiency utilization optimization are carried out respectively;

[0070] The method for improving and optimizing system voltage levels is as follows:

[0071] If the lowest voltage U in the power supply arm min t First, check whether all AT substations in the power supply arm are in operation and whether the up and down lines in the power supply arm are fully connected in parallel. If not all are in operation or the up and down lines are not connected in parallel, then all AT substations need to be in operation and the up and down parallel switches need to be closed to enter the optimal impedance operation mode.

[0072] If the lowest voltage U in the power supply arm min t ​​If the system has entered the optimal impedance operation mode, the system closes the bilateral interconnection switch in the adjacent section of the power supply arm and controls the power flow through the power facilitation device, and the system enters the bilateral operation state; specifically, the two power supply arms between two adjacent traction substations are considered as one power supply unit, and the lowest voltage in the left power supply arm is U. min1 The lowest voltage in the right power supply arm is U. min2 , when U min1 min2 At that time, the power flow direction of the control power fusion device is from the right power supply arm to the left power supply arm; when U min1 >U min2 At that time, the power flow direction of the control power fusion device is from the left power supply arm to the right power supply arm;

[0073] Assuming two power supply arms between two adjacent traction substations constitute one power supply unit, the lowest voltage within the left power supply arm is U. min1 The lowest voltage in the right power supply arm is U. min2 If the U-shaped distance between two adjacent traction substations t min1 p or U t min2 p The system is already in a two-sided operating state, and this state will be maintained. Frequent switching of the system's operating state will be avoided through hysteresis comparison. Real-time monitoring of voltage and the real-time load of the power supply unit will continue. When U... min1 >U p U min2 >U p And the real-time load S of the power supply unit is less than 0.5S. max At that time, disconnect the bilateral interconnection switch within the substation to restore the optimal impedance operation mode; among which, S max This represents the system load of the power supply unit. Based on this, if the power supply arm becomes unloaded, that is, when the real-time load of the power supply unit S=0, the reinforcement AT station is decommissioned, and only the AT station in the middle of the power supply arm and the section station at the end of the power supply arm are put into operation, entering the normal operation mode. It should be noted that in the normal operation mode, only one AT station in the middle of the power supply arm needs to be kept. In actual operation, it is recommended to keep the AT station in the middle or near the middle. Too close to one side will reduce the system power supply capacity.

[0074] If the system enters a two-sided operation state, and U c min t The system enters a low-voltage alarm state and continuously monitors the lowest voltage U in real time. min If the change persists for more than 300 seconds, the system will enter fault mode and the number of train trips will need to be limited. ​​​​​​​

[0075] If the system enters a two-sided operation state, and U min c The system enters a low-voltage alarm state and continuously monitors the lowest voltage U in real time. min If the change persists for more than 60 seconds, the system will enter fault mode and the number of train trips will need to be limited.

[0076] The method for optimizing system performance utilization is as follows:

[0077] When U min >U p The system operates by defining two power supply arms between two adjacent traction substations as a single power supply unit. It continuously monitors voltage and system load changes in real time. Based on the real-time load of the traction transformer in the left-hand traction substation or / and the real-time load of the traction transformer in the right-hand traction substation within the power supply unit, and in conjunction with a power fusion device, it controls power flow to improve the overall efficiency of the traction power supply system. Specifically:

[0078] If U min >U p Each power supply unit is defined as one of the two power supply arms between two adjacent traction substations. Voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation within the power supply unit exceeds 2·S... 1N The system closes the bilateral interconnection switch within the substation of the power supply unit and controls the power flow from the right power supply arm to the left power supply arm through the power facilitation device to prevent the system from continuously operating under overload conditions; where S 1N This represents the rated power value of the left traction transformer. It should be noted that the system judges the real-time load of the traction transformer of the left traction substation within the power supply unit. When the right traction substation is not overloaded, the overall power distribution of the system can be more balanced. When the right traction substation is also overloaded, it will not affect the system's power balance distribution, so as to keep the power of both traction substations below 3 times the rated power value of the traction transformer as much as possible. When it exceeds 3 times the rated power value of the traction transformer, the system fault operation alarm condition will be triggered.

[0079] If U min >U p Each power supply unit is defined as one of the two power supply arms between two adjacent traction substations. Voltage and system load changes are continuously monitored in real time. If the real-time load S2 of the traction transformer in the right-hand traction substation within the power supply unit exceeds 2·S... 2N The system closes the bilateral interconnection switch within the substation of the power supply unit and controls the power flow from the left power supply arm to the right power supply arm through the power facilitation device to prevent the system from continuously operating under overload conditions; where S 2N This represents the rated power value of the traction transformer on the right side;​

[0080] If U min >U p The two power supply arms between two adjacent traction substations are considered as a power supply unit. The voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation is less than 0 and the real-time load S2 of the traction transformer in the right traction substation is greater than 0, the system closes the double-sided interconnection switch in the substation and controls the power flow from the left power supply arm to the right power supply arm through the power fusion device. This fully utilizes the regenerative braking energy in the adjacent power supply arms, reduces the risk of overvoltage in the system, and improves the overall efficiency of the traction power supply system.

[0081] If U min >U p The system treats the two power supply arms between two adjacent traction substations as a single power supply unit, continuously monitoring voltage and system load changes in real time. If the real-time load S1 of the traction transformer in the left traction substation is greater than 0 and the real-time load S2 of the traction transformer in the right traction substation is less than 0, the system closes the bilateral interconnection switch within the substation and controls the flow of power from the right power supply arm to the left power supply arm through the power fusion device. This fully utilizes the regenerative braking energy within the adjacent power supply arms, reduces the risk of overvoltage in the system, and improves the overall efficiency of the traction power supply system.

[0082] System performance optimization methods also include:

[0083] If U min >U p The two power supply arms between two adjacent traction substations are considered as one power supply unit. The voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer in the left traction substation is less than or equal to 0 and the real-time load S2 of the traction transformer in the right traction substation is less than or equal to 0, the system disconnects the double-sided interconnection switch in the substation and withdraws the reinforced AT substation. Only the AT substation in the middle of the power supply arm and the substation at the end of the power supply arm are put into operation and run in the conventional mode to avoid the occurrence of equalization current and the impact on power quality of the external power supply system.

[0084] If U min >U p The two power supply arms between two adjacent traction substations are considered as one power supply unit. Voltage and system load changes are continuously monitored in real time. If the real-time load S1 of the traction transformer at the left traction substation exceeds 3·S... 1N Or, the real-time load S2 of the traction transformer at the right-side traction substation exceeds 3·S. 2N If the state persists for more than 120 seconds, the system will enter fault mode and the number of train pairs will need to be limited.

[0085] It should be noted that after the system has been running for a certain period of time, the system voltage optimization threshold U is set. p Voltage limiting threshold U t Voltage limit threshold U c And the 95% probability value U of the system's daily minimum voltage fluctuation. av The system has the capability to autonomously set and verify evaluation thresholds. Based on the optimization results of system voltage level improvement and efficiency utilization, it adjusts the system voltage optimization threshold U. p Voltage limiting threshold U t Perform verification and optimize the system voltage threshold U. p Voltage limiting threshold U t When performing the verification, the power supply voltage regulation stability coefficient and the power supply capacity enhancement depth coefficient need to be considered; among them,

[0086] Power supply voltage regulation stability coefficient μ=(U p -U t ) / (U n -U t ), where U n The voltage regulation stability coefficient represents the rated voltage of the traction power supply system (typically 27.5kV in my country). It characterizes the system's ability to maintain stable operation in response to traction grid voltage fluctuations during power supply capacity regulation. A higher value indicates a stronger hysteresis comparison window voltage (U0). p -U t The larger the value, the fewer times the system switches operating modes during power supply capacity adjustment, and the more stable the operating status.

[0087] According to the generally accepted rules of the power supply voltage regulation stability coefficient μ by those skilled in the art, when μ ≥ 70%, it indicates that the system has strong stability during power supply capacity regulation; when 15% ≤ μ < 70%, it indicates that the system has moderate stability during power supply capacity regulation; when μ < 15%, it indicates that the system has weak stability during power supply capacity regulation. In actual operation, it is recommended to use a moderate and stable threshold setting; if the system has high requirements for voltage regulation capability, the value of μ can be appropriately reduced.

[0088] Power supply capability enhancement depth coefficient β=(U av -U t ) / (U p -U t ), where U av The system's daily minimum voltage fluctuation probability value is 95%; the power supply capacity enhancement depth coefficient characterizes the voltage optimization threshold U. p The higher the value of the matching with the actual operation of the system, the better the matching degree of the system with the optimization and adjustment of the power supply capacity.

[0089] According to the generally accepted criteria for the power supply capability enhancement depth coefficient β among those skilled in the art, when β ≥ 80%, the system's regulation depth matching degree is excellent; when 30% ≤ β < 80%, the system's regulation depth matching degree is good; when β < 30%, the system's regulation depth matching degree is insufficient, and the voltage optimization threshold U should be readjusted. p If the β value matching is good or insufficient, it is recommended to readjust the voltage optimization threshold U. p Voltage limiting threshold U t The settings are adjusted to better match the actual operating conditions of the system.

[0090] For the voltage limit threshold U c Voltage limit threshold U c This is the lower limit of the safe voltage set by the operations department when the system is running. If it is lower than this value, it means that the system safety does not meet the requirements. Therefore, once it is set, it does not need to be adjusted during subsequent threshold verification.

[0091] It should be noted that the system load S of the power supply unit max The definition method is as follows:

[0092] When the lowest voltage U in the power supply arm min t Furthermore, the system has entered the optimal impedance operating mode, and the system has closed the bilateral interconnection switch in the adjacent section of the power supply arm. At this time, the system load S of the power supply unit is defined. max It is the sum of the loads of the traction transformers at the left and right traction substations within the power supply unit;

[0093] In addition, the real-time load of the traction transformer in the traction substation can be obtained through the electrical information matrix. The real-time load value is obtained by multiplying the real-time voltage and current values ​​of the feeder at the corresponding traction substation (starting point of the power supply arm).

[0094] Example 2

[0095] In this embodiment, the process of optimizing the power supply capacity of a multi-source long-distance traction power supply system using the method of this application is as follows:

[0096] like Figure 1 As shown, according to the multi-source traction power supply system structure, the power supply section between the left and right traction substations is considered as a multi-source power supply section. The length data of the power supply arm between the left and right traction substations and the length data of the AT section within the power supply arm are obtained, forming a line structure information matrix and a power supply arm structure information matrix respectively. Voltage and current data at the feeders of the traction substations, AT stations, and section substations are obtained. Based on the data arrangement order within the power supply arm structure information matrix, a corresponding electrical information matrix is ​​formed. The sampling and calculation update time interval is... ​;

[0097] Specifically, such as Figure 1 As shown, according to the structure of the multi-source traction power supply system, the power supply section between the left and right traction substations is regarded as a multi-source power supply section, forming a line structure information matrix [L1,L2] and a power supply arm structure information matrix. And form an electrical information matrix. ;

[0098] Where L1 is the length of the left power supply arm and L2 is the length of the right power supply arm; The length between the traction substation (starting point of the power supply arm) and the first AT substation within the first power supply arm. The length between the first AT station and the second AT station within the first power supply arm. The length between the second and third AT stations within the first power supply arm. The length between the 3rd and 4th AT stations within the 1st power supply arm. The length between the 4th and 5th AT stations within the 1st power supply arm. The length between the 5th AT station and the AT section station (end of the power supply arm) within the 1st power supply arm; The length between the traction substation (starting point of the power supply arm) within the second power supply arm and the first AT substation. The length between the first AT station and the second AT station within the second power supply arm. The length between the second and third AT stations within the second power supply arm. The length between the third and fourth AT stations within the second power supply arm. The length between the 4th and 5th AT stations within the 2nd power supply arm. The length between the 5th AT station and the AT section station (end of the power supply arm) within the 2nd power supply arm; The voltage at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. , , , , This refers to the voltage at the feed lines of the 1st, 2nd, 3rd, 4th, and 5th ATs within the 1st power supply arm. This indicates the voltage at the feeder of the AT section (end of the power supply arm) within the first power supply arm; This refers to the voltage at the feeder of the traction substation (starting point of the power supply arm) within the second power supply arm. , , , , This refers to the voltage at the feed lines of the 1st, 2nd, 3rd, 4th, and 5th ATs within the 2nd power supply arm. This indicates the voltage at the feeder of the AT section (end of the power supply arm) within the second power supply arm; This refers to the current at the feeder of the traction substation (starting point of the power supply arm) within the first power supply arm. , , , , This refers to the current at the feeders of the 1st, 2nd, 3rd, 4th, and 5th ATs within the 1st power supply arm. This indicates the current at the feeder of the AT section (end of the power supply arm) within the first power supply arm; This refers to the current at the feeder of the traction substation (starting point of the power supply arm) within the second power supply arm. , , , , This refers to the current at the feeders of the 1st, 2nd, 3rd, 4th, and 5th ATs within the 2nd power supply arm. This indicates the current at the feeder of the AT section (end of the power supply arm) within the second power supply arm;

[0099] According to the power flow optimization control strategy, the system voltage optimization threshold U is first set. p Voltage limiting threshold U t Voltage limit threshold U c The lowest voltage U in the left power supply arm is obtained based on the electrical information matrix. min1 The lowest voltage U in the right power supply arm min2 To optimize and improve system voltage levels:

[0100] Step 1: Determine whether the minimum voltage of the system power supply arm is lower than the set voltage limit threshold U. t , if U min1 t or U min2 t Check whether all AT substations within the power supply arm are engaged and whether the uplink and downlink lines within the power supply arm are fully connected in parallel. If not all are engaged or not connected in parallel, all AT substations must be engaged and the uplink and downlink parallel switches closed to enter the optimal impedance operation mode. Figure 2 As shown;

[0101] The second step is to determine if the system has entered the optimal impedance operation mode and the system power supply arm has the lowest voltage U. min1 or U min2 Still below the set voltage limit threshold U t The system closes the bilateral interconnection switches within the partition and controls power flow through the power facilitation device, thus entering a bilateral operation state. Figure 3 ​​As shown; at this time, the system load S of the power supply unit is defined. max It is the sum of the loads of the traction transformers at the left and right traction substations within the power supply unit;

[0102] Third step, when U min1 min2 At that time, the power flow direction of the control power fusion device is from the right power supply arm to the left power supply arm, such as... Figure 4 As shown; when U min1 >U min2 At that time, the power flow direction of the control power fusion device is from the left power supply arm to the right power supply arm, such as... Figure 5 As shown;

[0103] Fourth step: If the minimum voltage of the power supply arm is between the voltage limit threshold and the voltage optimization threshold, i.e., U t min1 p or U t min2 p The system is already in a two-sided operation state, and this state will be maintained. Frequent switching of system operating states will be avoided through hysteresis comparison. Voltage and system load will continue to be monitored in real time. When the minimum voltage of the power supply arm exceeds the voltage optimization threshold and the system load is halved from its peak value, i.e., U... min1 >U p U min2 >U p And the system real-time load (S) 12 +S 21 <0.5S max At that time, the system disconnects the bilateral interconnection switch within the partition and restores the optimal impedance operating mode, such as... Figure 2 As shown; where S 12 S represents the real-time load of the traction transformer at the left-side traction substation. 21 This represents the real-time load of the traction transformer at the right-side traction substation.

[0104] Hysteresis comparison process as follows Figure 6 As shown, at time t1, the lowest voltage U in the power supply arm min Below U t The system state changes from the optimal impedance operating mode to closing the bilateral tie switch, and at time t2, U... min Upgrade to U t with U p Within the interval, then U min Although fluctuations still occurred during the time period from t3 to t7, the system state remained unchanged, avoiding frequent switching of the communication switch. At time t8, U min More than U p Furthermore, the real-time system load is halved, i.e., S < 0.5S.​​​​​max At this time, the system will then perform the operation of disconnecting the bilateral tie switches within the substation to restore the optimal impedance operating mode; based on this, if the power supply arm becomes unloaded, that is, the real-time load S of the power supply unit... 12 =0 and S 21 =0, the reinforcement AT station can be exited and the normal operation mode can be entered, with only the AT stations in the middle of the power supply arm and the terminal section stations remaining in operation. Figure 1 As shown.

[0105] Step 5: If the minimum voltage of the power supply arm is between the voltage limit threshold and the voltage limit threshold, i.e., U c min1 t or U c min2 t The system enters a low-voltage alarm state and continuously monitors the lowest voltage U in real time. min1 U min2 If the change persists for more than 300 seconds, the system will enter fault mode and the number of train trips will need to be limited.

[0106] Step 6: If the minimum voltage of the power supply arm is lower than the voltage limit threshold, i.e., U... min1 c or U min2 c Entering low voltage alarm state, continuously monitoring the lowest voltage U in real time. min1、 U min2 If the changes continue for more than 60 seconds, the system will enter fault mode and the number of train trips will need to be limited.

[0107] Step 7: If the minimum voltage of the power supply arm is higher than the voltage optimization threshold, i.e., U min1 >U p AndU min2 >U p To maintain optimal impedance operation mode, the system disconnects the bilateral interconnection switches within the partition, and the partition operates in a phase-separated electrical state. Figure 2 As shown; based on this, if the power supply arm becomes unloaded, that is, the real-time load S of the power supply unit... 12 =0 and S 21 =0, the reinforcement AT station can be withdrawn, and only the AT stations in the middle of the power supply arm and the terminal section stations will remain in operation, such as Figure 1 As shown.

[0108] Based on the power flow optimization control strategy, and using the set system voltage optimization threshold U... p Voltage limiting threshold U t Voltage limit threshold U c Based on the lowest voltage U in the left power supply arm​​​​​​min1 The lowest voltage U in the right power supply arm min2 To optimize the load level and efficiency utilization of traction transformers, a power supply unit is defined as two power supply arms between two adjacent traction substations, and voltage and system load changes are continuously monitored in real time.

[0109] The first step is to determine if the minimum voltage of all power supply arms within the power supply unit is higher than the voltage optimization threshold, i.e., U min1 >U p AndU min2 >U p Continuously monitor voltage and system load changes in real time. If the load on the traction transformer of the left traction substation exceeds twice the rated power, i.e., S... 12 >2·S 1N When this occurs, the system closes the bilateral interconnection switch within the partition and controls the power flow from the right power supply arm to the left power supply arm through the power facilitation device, such as... Figure 4 As shown; if the load on the traction transformer of the right-hand traction substation exceeds twice its rated power, i.e., S 21 >2·S 2N The system then closes the bilateral interconnection switch within the partition and controls the power flow from the left power supply arm to the right power supply arm through the power facilitation device, such as... Figure 5 As shown, this is to prevent the system from continuously operating in an overloaded state; where S 1N S represents the rated power value of the left-side traction transformer. 2N This represents the rated power value of the traction transformer on the right side;

[0110] The second step is to ensure that the minimum voltage of all power supply arms within the power supply unit is higher than the voltage optimization threshold, i.e., U... min1 >U p AndU min2 >U p Continuously monitor voltage and system load changes in real time. If the left traction substation is in regenerative braking mode and the right traction substation is in traction mode, i.e., S... 12 <0 and S 21 If the value is greater than 0, the system closes the double-sided switches within the partition and controls the power flow from the left power supply arm to the right power supply arm through the power facilitation device. Figure 5 As shown; if the right traction substation is in regenerative braking mode and the left traction substation is in traction mode, i.e., S 12 >0 and S 21 If the value is less than 0, the system closes the double-sided switches within the partition and controls the power flow from the right power supply arm to the left power supply arm through the power facilitation device. Figure 4 As shown, by making full use of the regenerative braking energy in adjacent power supply arms, the risk of overvoltage in the system is reduced and the overall efficiency of the traction power supply system is improved.

[0111] The third step is to ensure that the minimum voltage of all power supply arms within the power supply unit is higher than the voltage optimization threshold, i.e., U... min1 >U p AndU min2 >U p Continuously monitor voltage and system load changes in real time. If both left and right traction substations are in regenerative braking mode, i.e., S... 12 ≤0 and S 21 If the value is ≤0, the system disconnects the bilateral switches within the partition and operates in normal mode. Figure 1 As shown, this is to avoid the occurrence of balancing current, which could affect the power quality of the external power supply system;

[0112] Fourth step: If the minimum voltage of all power supply arms in the power supply unit is higher than the voltage optimization threshold, i.e., U min1 >U p AndU min2 >U p Continuously monitor voltage and system load changes in real time. If the load on the traction transformer of the left or right traction substation exceeds three times its rated power, i.e., S... 12 >3·S 1N or S 21 >3·S 2N If the state persists for more than 120 seconds, the system will enter fault mode and the number of train pairs will need to be limited.

[0113] Another option is to form a power flow regulation matrix based on the above-mentioned judgments, according to the power flow optimization control strategy. For example, if the system enters normal operation mode, the relevant value in the regulation matrix is ​​set to 0; if the left power supply arm of the system enters the optimal impedance operation mode, the relevant value in the regulation matrix is ​​set to 1; if the right power supply arm of the system enters the optimal impedance operation mode, the relevant value in the regulation matrix is ​​set to 2; if the system closes the double-sided interconnection switch in the substation and controls the power flow from left to right through the power facilitation device, the relevant value in the regulation matrix is ​​set to 3; if the system closes the double-sided interconnection switch in the substation and controls the power flow from right to left through the power facilitation device, the relevant value in the regulation matrix is ​​set to 4; and if the system enters fault mode, the relevant value in the regulation matrix is ​​set to -1.

[0114] After the system has been running for a certain period of time, the system voltage optimization threshold U is set. p Voltage limiting threshold U t Voltage limit threshold U c And the 95% probability value U of the system's daily minimum voltage fluctuation. av The system has the capability to set and verify evaluation thresholds autonomously.

[0115] The first step is to calculate the power supply voltage regulation stability coefficient μ=(U p -Ut ) / (U n -U t ), where U n This represents the rated voltage of the traction power supply system (in my country, the traction power supply system is typically 27.5kV).

[0116] The system's stable operation capability during traction network voltage fluctuations should be verified during power supply capacity adjustment. When μ ≥ 70%, the system exhibits strong stability during power supply capacity adjustment; when 15% ≤ μ < 70%, the system exhibits moderate stability; and when μ < 15%, the system exhibits weak stability. In actual operation, it is recommended to use a moderate and stable threshold setting. If the system has high requirements for voltage regulation capability, the μ value can be appropriately reduced.

[0117] The second step is to calculate the power supply capability enhancement depth coefficient β=(U av -U t ) / (U p -U t ), for the set system voltage optimization threshold U p The matching degree with the actual system operation is checked. When β ≥ 80%, the matching degree of the system adjustment depth is excellent; when 30% ≤ β < 80%, the matching degree of the system adjustment depth is good; when β < 30%, the matching degree of the system adjustment depth is insufficient, and the threshold U should be readjusted. p .

[0118] The substation of this invention is the power source for the entire system. The phase separation is similar to a device for dividing the power supply range. In a multi-source power supply system, it operates normally through parallel switches. It is only put into parallel operation when the system voltage level is improved and optimized, and the load level and efficiency utilization of the traction transformer are optimized. This optimizes the grid voltage at the end of the power supply arm in the long-distance power supply mode, significantly increases the power supply distance between adjacent traction substations, balances the load distribution of two adjacent traction substations, promotes the effective utilization of regenerative braking energy, and improves the efficiency level and operation quality of the cross-strait long-distance traction power supply system.

[0119] Example 3

[0120] This invention also provides a power supply capacity adjustment and optimization system for a multi-source long-distance traction power supply system. The power supply system includes several traction substations, with AT (Automatic Transmission) sectioning stations and power sharing devices installed between adjacent traction substations, and several AT stations installed between the traction substations and the AT sectioning stations. The system includes:

[0121] The line structure information matrix acquisition module is used to acquire power supply arm length data of traction substations along electrified railways and form a line structure information matrix. ;in, Let x be the length of the x-th power supply arm;

[0122] The power supply arm structure information matrix acquisition module is used to acquire the AT section length data within the power supply arm along the electrified railway line and form a power supply arm structure information matrix. ;in, The length between the traction substation and the first AT station within the first power supply arm. The length between the first AT station and the second AT station within the first power supply arm. This is the length between the m-th AT station and the AT substation within the first power supply arm, where m represents the total number of AT stations within the first power supply arm; This is the length between the nth AT station and the AT substation within the second power supply arm, where n represents the total number of AT stations within the second power supply arm. Let q be the length between the q-th AT station and the AT substation within the x-th power supply arm, where q represents the total number of AT stations within the x-th power supply arm.

[0123] The electrical information matrix acquisition module is used to acquire voltage and current data at the feeders of each traction substation, AT substation, and AT section substation, forming an electrical information matrix. ;in, This refers to the voltage at the feeder of the traction substation within the first power supply arm. This refers to the voltage at the feed line of the first AT unit within the first power supply arm. The voltage at the feed line of the m-th AT within the first power supply arm. This indicates the voltage at the feeder of the AT section within the first power supply arm; Let be the voltage at the feeder of the traction substation within the x-th power supply arm. Let be the voltage at the feed line of the first AT within the x-th power supply arm. This represents the voltage at the feeder of the AT section within the x-th power supply arm; This refers to the current at the feeder of the traction substation within the first power supply arm. This refers to the current at the feeder of the first AT unit within the first power supply arm. This refers to the current at the feeder of the m-th AT within the first power supply arm. This indicates the current at the feeder of the AT section within the first power supply arm; Let be the current at the feeder of the traction substation within the x-th power supply arm. Let be the current at the feeder of the first AT in the xth power supply arm. Let be the current at the feeder of the q-th AT within the x-th power supply arm. This represents the current at the feeder of the AT section within the x-th power supply arm;

[0124] The system voltage level enhancement and efficiency utilization optimization module is used to determine the system voltage optimization threshold U.p Voltage limiting threshold U t Voltage limit threshold U c The minimum voltage U in each power supply arm is determined based on the formed electrical information matrix. min Based on the threshold and the minimum voltage U min System voltage level improvement optimization and efficiency utilization optimization are carried out respectively;

[0125] The threshold verification module is used to set the system voltage optimization threshold U based on the system voltage level improvement optimization and efficiency utilization optimization results. p Voltage limiting threshold U t Perform verification;

[0126] The method for optimizing system voltage level improvement is as follows:

[0127] If the lowest voltage U in the power supply arm min t First, check whether all AT stations in the power supply arm are in operation and whether the up and down lines in the power supply arm are fully connected in parallel. If not all are in operation or the up and down lines are not connected in parallel, then all AT stations need to be in operation and the up and down parallel switches need to be closed to enter the optimal impedance operation mode.

[0128] If the lowest voltage U in the power supply arm min t If the system has entered the optimal impedance operation mode, the system closes the bilateral interconnection switch in the adjacent section of the power supply arm and controls the power flow through the power fusion device, and the system enters the bilateral operation state.

[0129] After the system enters the dual-side operation state, it continues to monitor the voltage in real time and adjusts and optimizes the system voltage level in real time.

[0130] The method for optimizing system performance utilization is as follows:

[0131] When U min >U p The system uses two power supply arms between two adjacent traction substations as a power supply unit, continuously monitors voltage and real-time load changes, and controls power flow based on the real-time load of the traction transformer in the left traction substation or / and the real-time load of the traction transformer in the right traction substation within the power supply unit, combined with the power fusion device, to improve the overall efficiency of the traction power supply system.

[0132] Furthermore, the present invention adopts the following technical solution:

[0133] A non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the power supply capacity adjustment and optimization method for a multi-source long-distance traction power supply system as described above. ​​

[0134] Furthermore, the present invention adopts the following technical solution:

[0135] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the power supply capacity adjustment and optimization method for a multi-source long-distance traction power supply system as described above.

[0136] From the above description of the embodiments, those skilled in the art will clearly understand that the facilities of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Embodiments of the present invention can be implemented using existing processors, or by dedicated processors used for this or other purposes for suitable systems, or by hardwired systems. Embodiments of the present invention also include non-transitory computer-readable storage media, comprising machine-readable media for carrying or having machine-executable instructions or data structures stored thereon; such machine-readable media can be any available medium accessible by a general-purpose or special-purpose computer or other machine with a processor. For example, such machine-readable media can include RAM, ROM, EPROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store the required program code in the form of machine-executable instructions or data structures and is accessible by a general-purpose or special-purpose computer or other machine with a processor. When information is transmitted or provided to a machine via a network or other communication connection (hardwired, wireless, or a combination of hardwired and wireless), that connection is also considered a machine-readable medium.

[0137] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for regulating and optimizing the power supply capacity of a multi-source long-distance traction power supply system, wherein the power supply system comprises a plurality of traction substations, an AT partition substation and a power blending device are arranged between adjacent traction substations, and a plurality of AT substations are arranged between the traction substations and the AT partition substation; characterized in that, The method comprises the following steps: obtaining the length data of the power supply arm of the traction substation along the electrified railway to form a line structure information matrix; obtaining the length data of the AT section in the power supply arm along the electrified railway to form a power supply arm structure information matrix; the arrangement mode of the length data of the AT section in the power supply arm structure information matrix is matched with the length data of the power supply arm in the line structure information matrix; obtaining the voltage and current data at the feeder of each traction substation, AT substation and AT partition substation to form an electrical information matrix; the arrangement mode of the voltage and current data in the electrical information matrix is matched with the power supply arm structure information matrix formed by the length data of the AT section in the power supply arm; Determine the system voltage optimization threshold U p Voltage limiting threshold U t Voltage limit threshold U c The minimum voltage U in each power supply arm is determined based on the formed electrical information matrix. min Based on the threshold and the minimum voltage U min System voltage level improvement optimization and efficiency utilization optimization are carried out respectively; According to the system voltage level promotion optimization and the performance utilization optimization result, the system voltage optimization threshold U p , the voltage limit threshold U t , the voltage limit threshold U c is checked; The method for improving and optimizing the system voltage level is: If the lowest voltage U min <U t , first check whether the AT in the power supply arm is all put in and whether the up and down lines in the power supply arm are completely parallel, if not all put in or the up and down lines are not parallel, then all ATs need to be put in and the up and down parallel switches need to be closed, entering the optimal impedance operation mode; If the lowest voltage U min <U t , and the system has entered the optimal impedance operation mode, the system closes the bilateral tie switch in the adjacent partition of the power supply arm, and controls the power flow through the power fusion device. The system enters the bilateral operation state. After the system enters the double-side operation state, the voltage is continuously monitored in real time, and the system voltage level is adjusted and optimized in real time; The method for optimizing the system efficiency utilization is: When U min >U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitoring the voltage and system real-time load change, according to the real-time load of the left traction substation traction transformer in the power supply unit or / and the real-time load of the right traction substation traction transformer in the power supply unit, combined with the power flow control device, the power flow is controlled, and the overall efficiency level of the traction power supply system is improved.

2. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 1, characterized in that, After the system enters the double-side operation state, the voltage is continuously monitored in real time, and the system voltage level is adjusted and optimized in real time; According to two power supply arms between two adjacent traction substations as a power supply unit, the lowest voltage in the left power supply arm is U min1 , the lowest voltage in the right power supply arm is U min2 ; if U t <U min1 <U p or U t <U min2 <U p , and the system has been in the bilateral operation state, the bilateral operation state is maintained, the system working state is avoided from frequent switching through the hysteresis comparison mode; the real-time voltage and the real-time load of the power supply unit are continuously monitored, when U min1 >U p , U min2 >U p and the real-time load S of the power supply unit is less than 0.5S max , the bilateral connection switch in the substation is disconnected, and the optimal impedance operation mode is restored. S max The system load represents the power supply unit; on this basis, if the power supply arm is empty and runs as a load, the supplementary AT station is withdrawn, only the power supply arm middle AT station and the power supply arm end partition station are put into operation, and the normal operation mode is entered. If the system enters the bilateral operation state, and U c <U min <U t The system enters the low-voltage alarm state, and the lowest voltage U min changes are monitored in real time. If the state lasts for more than 300 seconds, the system enters the fault mode operation, and the number of train trips needs to be limited. If the system enters the bilateral operation state, and U min <U c The system enters the low-voltage alarm state, and the lowest voltage U min is monitored in real time. If the state lasts for more than 60 seconds, the system enters the fault mode operation, and the number of train trips needs to be limited.

3. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 1, characterized in that, If the lowest voltage U min <U t , and the system has entered the optimal impedance operation mode, the system closes the double-sided tie switch in the adjacent partition of the power supply arm, and controls the power flow through the power fusion device. According to two power supply arms between two adjacent traction substations as one power supply unit, the lowest voltage in the left power supply arm is U min1 , and the lowest voltage in the right power supply arm is U min2 , when U min1 <U min2 , the power flow direction of the power flow control device is from the right power supply arm to the left power supply arm; when U min1 >U min2 , the power flow direction of the power flow control device is from the left power supply arm to the right power supply arm.

4. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 2, characterized in that, System load S of the power supply unit max The definition method is: When the lowest voltage U min <U t , and the system has entered the optimal impedance operation mode, and the system closes the bilateral tie switch in the substation adjacent to the power supply arm, the system load S max is the sum of the traction transformer load of the left traction substation and the traction transformer load of the right traction substation in the power supply unit.

5. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 1, characterized in that, According to the system voltage level promotion optimization and performance utilization optimization results, the system voltage optimization threshold U p , the voltage limit threshold U t When checking, the power supply voltage adjustment stability coefficient and the power supply capacity enhancement depth coefficient need to be considered; wherein, The power supply voltage regulation stability coefficient μ = (U p -U t ) / (U n -U t ), wherein U n represents the rated voltage of the traction power supply system; the power supply voltage regulation stability coefficient characterizes the stable operation capability of the system when coping with the fluctuation of the traction network voltage during the power supply capability regulation process, and the greater the value is, the greater the window voltage value of the hysteresis comparison of the system is, the fewer the number of switching operation modes of the system during the power supply capability regulation process is, and the more stable the operation state is. Power supply capacity enhancement depth coefficient β = (U av -U t ) / (U p -U t ), wherein U av is the 95% probability value of the minimum voltage fluctuation of the system per day; the power supply capacity enhancement depth coefficient represents the matching of the voltage optimization threshold U p to the actual operation of the system, and the greater the value, the higher the matching degree of the system to the power supply capacity optimization adjustment.

6. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 1, characterized in that, The method for improving the overall efficiency level of the traction power supply system by combining the power flow control of the power blending device according to the real-time load of the traction transformer of the left traction substation in the power supply unit and / or the real-time load of the traction transformer of the right traction substation in the power supply unit is: If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitor the voltage and system load change, if the real-time load S1>2·S 1N of the left traction transformer in the power supply unit, the system closes the bilateral contact switch in the substation in the power supply unit, and controls the power flow from the right power supply arm to the left power supply arm through the power fusion device, to avoid the system from continuously operating in an overload state; wherein S 1N represents the rated power value of the left traction transformer; If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitor the voltage and system load change, if the real-time load S2>2·S 2N of the traction transformer in the right side of the power supply unit, the system closes the bilateral contact switch in the substation in the power supply unit, and controls the power flow from the left side to the right side through the power fusion device, to avoid the system from continuously operating in an overload state; wherein S 2N represents the rated power value of the right side traction transformer; If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitoring the voltage and system load change, if the real-time load S1 of the left traction substation in the power supply unit is <0 and the real-time load S2 of the right traction substation is >0, the system closes the bilateral contact switch in the substation, and controls the power flow from the left power supply arm to the right power supply arm through the power fusion device. If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitor the voltage and system load change, if the real-time load S1>0 of the left traction substation traction transformer and the real-time load S2<0 of the right traction substation traction transformer, the system closes the bilateral contact switch in the substation, and controls the power flow from the right power supply arm to the left power supply arm through the power fusion device.

7. The multi-source long-distance traction power supply system power supply capacity adjustment optimization method according to claim 6, characterized in that, The method for optimizing the system efficiency utilization further comprises: If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitoring the voltage and system load change, if the real-time load S1 of the left traction substation traction transformer ≤0 and the real-time load S2 of the right traction substation traction transformer ≤0, the system disconnects the bilateral contact switch in the substation, exits the reinforcement AT substation, only retains the middle AT substation and the end substation of the power supply arm in operation, and operates according to the conventional mode, avoiding the balanced current and the influence on the external power system. If U min > U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitor the voltage and system load change, if the real-time load of the left traction substation S1>3·S 1N or the real-time load of the right traction substation S2>3·S 2N , if the state lasts for more than 120s, the system enters the fault mode operation, and the number of train operation needs to be limited.

8. A multi-source long-distance traction power supply system power supply capacity adjustment optimization system, the power supply system comprising a plurality of traction substations, an AT partition substation and a power blending device being arranged between adjacent traction substations, and a plurality of AT substations being arranged between the traction substations and the AT partition substation; characterized in that, The system comprises: a line structure information matrix acquisition module for obtaining the length data of the power supply arm of the traction substation along the electrified railway to form a line structure information matrix; a power supply arm structure information matrix acquisition module for obtaining the length data of the AT section in the power supply arm along the electrified railway to form a power supply arm structure information matrix; the arrangement mode of the length data of the AT section in the power supply arm structure information matrix is matched with the length data of the power supply arm in the line structure information matrix; an electrical information matrix acquisition module for obtaining the voltage and current data at the feeder of each traction substation, AT substation and AT partition substation to form an electrical information matrix; the arrangement mode of the voltage and current data in the electrical information matrix is matched with the power supply arm structure information matrix formed by the length data of the AT section in the power supply arm; The system voltage level promotion optimization and performance utilization optimization module is used to determine the system voltage optimization threshold U p , the voltage limit threshold U t , the voltage limit threshold U c , according to the formed electrical information matrix, determine the lowest voltage U min , according to the threshold and the lowest voltage U min , respectively, the system voltage level promotion optimization and performance utilization optimization; The threshold checking module is configured to check the system voltage optimization threshold U according to the system voltage level promotion optimization result and the performance utilization optimization result. p , the voltage limit threshold U t is checked. The method for improving and optimizing the system voltage level is: If the lowest voltage U min <U t , first check whether the AT in the power supply arm is all put in and whether the up and down lines in the power supply arm are completely parallel, if not all put in or the up and down lines are not parallel, then all ATs need to be put in and the up and down parallel switches need to be closed, entering the optimal impedance operation mode; If the lowest voltage U min <U t , and the system has entered the optimal impedance operation mode, the system closes the bilateral tie switch in the adjacent partition of the power supply arm, and controls the power flow through the power fusion device. The system enters the bilateral operation state. After the system enters the double-side operation state, the voltage is continuously monitored in real time, and the system voltage level is adjusted and optimized in real time; The method for optimizing the system efficiency utilization is: When U min >U p , according to two power supply arms between two adjacent traction substations as a power supply unit, continuously monitoring the voltage and system real-time load change, according to the real-time load of the left traction substation traction transformer in the power supply unit or / and the real-time load of the right traction substation traction transformer in the power supply unit, combined with the power flow control device, the power flow is controlled, and the overall efficiency level of the traction power supply system is improved. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the method for adjusting and optimizing the power supply capacity of the multi-source long-distance traction power supply system as claimed in any one of claims 1 to 7.

10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the method for adjusting and optimizing the power supply capacity of the multi-source long-distance traction power supply system as claimed in any one of claims 1 to 7.

Images