A high-speed rail traction power supply monitoring method and system

Abstract

This invention relates to the field of traction power supply technology and provides a method and system for monitoring high-speed railway traction power supply. The method includes setting a monitoring cycle, dividing the monitoring cycle into several monitoring periods, acquiring the voltage value of the contact wire during each monitoring period, and generating a voltage state risk index. Based on the voltage state risk index, it determines whether the contact wire voltage is normal, generating a good voltage state signal and a poor voltage state signal. Based on the poor voltage state signal, and according to the voltage state risk index, voltage regulator data, and high-speed railway load data, it generates a high-speed railway traction power supply risk value. Based on the high-speed railway traction power supply risk value, it generates a high power supply mode switching demand signal and a low power supply mode switching demand signal. This invention can monitor the voltage state of the contact wire and, in conjunction with the operation of the voltage regulator, determine whether the high-speed railway traction power supply mode needs to be switched, preventing damage to the voltage regulator and thus improving the stability and safety of high-speed railway operation.

Description

Technical Field

[0001] The present invention relates to the technical field of traction power supply, and in particular to a high-speed railway traction power supply monitoring method and system. Background Art

[0002] The high-speed railway traction power supply system is an important infrastructure to ensure the high-speed, safe and stable operation of trains. The system is mainly composed of a collector, overhead line, pantograph, traction inverter and voltage stabilizer. The voltage stabilizer plays a key role in stabilizing the grid voltage and ensuring that the output voltage is always within the set range, which is crucial to the safety and stability of train operation. However, in actual operation, due to various reasons such as grid voltage fluctuations, equipment aging, and environmental factors, the voltage stabilizer may not work properly, thus affecting the stability of the traction power supply system.

[0003] In the prior art, the monitoring of the traction power supply system mainly focuses on the real-time monitoring of power supply parameters such as voltage and current, but lacks the monitoring of the working status of the voltage stabilizer and the judgment of the switching demand of the power supply mode based on the monitoring results.

[0004] When power supply abnormalities occur in the power supply system, if the power supply mode of the high-speed rail traction power supply is not switched in time, it may cause damage to the voltage stabilizer, causing abnormal operation of the high-speed rail and affecting the stability and safety of the high-speed rail operation. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a high-speed railway traction power supply monitoring method and system, aiming to solve the problems mentioned in the above background technology.

[0006] The embodiment of the present invention is implemented as follows: a high-speed railway traction power supply monitoring method includes:

[0007] Set a monitoring cycle, divide the monitoring cycle into several monitoring periods, obtain the voltage value of the contact line within the monitoring period, and generate a voltage state risk index;

[0008] According to the voltage state risk index, whether the voltage of the contact line is normal is judged, and a voltage state signal is generated; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal;

[0009] Based on the signal of poor voltage status, the risk value of high-speed rail traction power supply is generated according to the voltage status risk index, voltage stabilizer data and high-speed rail load data; wherein, the voltage stabilizer data refers to the rated voltage adjustment value of the voltage stabilizer, and the high-speed rail load data refers to the load value of the high-speed rail during operation during the monitoring period; the rated voltage adjustment value of the voltage stabilizer refers to the standard value that the voltage stabilizer can adjust to the voltage fluctuation occurring in the high-speed rail traction power supply;

[0010] According to the high-speed railway traction power supply risk value, it is determined whether the high-speed railway traction power supply needs to switch the power supply mode, and a power supply mode switching demand signal is generated; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

[0011] The monitoring cycle is set, the monitoring cycle is divided into a number of monitoring periods, the voltage value of the contact line in the monitoring period is obtained, and the voltage state risk index is generated, including:

[0012] Setting a monitoring cycle, dividing the monitoring cycle into a number of monitoring periods, obtaining the voltage value of the contact line within the monitoring period, and generating a voltage difference degree value of the contact line;

[0013] Obtain the voltage change value within the monitoring period and generate the abnormal period ratio within the monitoring period; wherein the voltage change value refers to the difference between the voltage values ​​of adjacent monitoring periods;

[0014] Obtaining a voltage variation excess value and generating a voltage variation excess degree value; wherein the voltage variation excess value refers to a value of the voltage variation value exceeding a normal voltage fluctuation range;

[0015] The voltage change excess value, abnormal period proportion and voltage difference value are weighted and summed to generate the voltage status risk index of the contact line during the monitoring period.

[0016] Preferably, the setting of the monitoring cycle, dividing the monitoring cycle into a number of monitoring time periods, obtaining the voltage value of the contact line within the monitoring time period, and generating the voltage state risk index specifically includes:

[0017] Setting a monitoring cycle, dividing the monitoring cycle into a number of monitoring time periods, and obtaining the voltage value of the contact line within the monitoring time period;

[0018] The voltage values ​​in all monitoring periods are averaged to generate the voltage average of the contact line in the monitoring period;

[0019] Calculate the difference between the voltage mean and the preset voltage value to generate a voltage difference value;

[0020] Calculate the ratio of the voltage difference value to the preset voltage value to generate a voltage difference degree value;

[0021] Calculate the difference between the voltage values ​​of adjacent monitoring periods to generate the voltage change value of the monitoring period;

[0022] Compare the voltage change value with the normal voltage fluctuation range. If the voltage change value is within the normal voltage fluctuation range, it means that the voltage change during the monitoring period is within the normal fluctuation range, and then mark the monitoring period as a normal voltage change period.

[0023] If the voltage change value is not within the normal voltage fluctuation range, it means that the voltage change during the monitoring period exceeds the normal fluctuation range, and the monitoring period is marked as an abnormal voltage change period;

[0024] Obtain the number of periods of abnormal voltage change, calculate the ratio of the number of periods of abnormal voltage change to the total number of monitoring periods, and generate the abnormal period ratio of the periods of abnormal voltage change;

[0025] The voltage change value during the abnormal voltage change period is calculated by difference with the near end point of the normal voltage fluctuation range to generate the voltage change excess value; wherein the near end point of the normal voltage fluctuation range refers to the voltage change value which is closest to the two end points of the normal voltage fluctuation range;

[0026] The voltage variation excess value is calculated by ratio calculation with the near end point of the voltage normal fluctuation range to generate the voltage variation excess degree value;

[0027] The voltage change excess value, abnormal period proportion and voltage difference value are weighted and summed to generate the voltage status risk index of the contact line during the monitoring period.

[0028] Preferably, judging whether the voltage of the contact line is normal according to the voltage state risk index and generating a voltage state signal specifically includes:

[0029] A voltage state risk index threshold is preset, and the voltage state risk index is compared with the voltage state risk index threshold; wherein the voltage state risk index threshold refers to the highest value of the voltage state risk index of the contact line under the standard state;

[0030] If the voltage state risk index is less than or equal to the voltage state risk index threshold, it means that the lower the voltage state risk index is, the better the voltage state of the contact line is, and a voltage state good signal is generated; when the voltage state good signal is received, the voltage state of the contact line continues to be monitored;

[0031] If the voltage state risk index is greater than the voltage state risk index threshold, it means that the higher the voltage state risk index is, the worse the voltage state of the contact line is, and a poor voltage state signal is generated; when a poor voltage state signal is received, the cause of the poor voltage state of the contact line is analyzed.

[0032] Preferably, the generating of the high-speed rail traction power supply risk value based on the poor voltage state signal according to the voltage state risk index, the voltage regulator data and the high-speed rail load data includes:

[0033] Based on the poor voltage status signal and the rated voltage adjustment value of the voltage regulator, a voltage regulator over-limit prediction index is generated;

[0034] Obtain the load value of the high-speed rail during operation during the monitoring period and generate a high-speed rail load index;

[0035] A power supply risk prediction model is established, and the voltage state risk index, voltage stabilizer over-limit prediction index and high-speed rail load index are substituted into the power supply risk prediction model to generate the high-speed rail traction power supply risk value.

[0036] Preferably, the generating of the high-speed rail traction power supply risk value based on the poor voltage state signal according to the voltage state risk index, the voltage regulator data and the high-speed rail load data specifically includes:

[0037] Obtain the average voltage of the contact line during the monitoring period, calculate the difference between the average voltage and the voltage required for high-speed rail operation, and obtain the required voltage adjustment value;

[0038] Calculate the difference between the required voltage adjustment value and the rated voltage adjustment value of the voltage regulator to generate a voltage regulator adjustment residual value;

[0039] Calculate the ratio of the voltage regulator regulation residual value to the voltage regulator rated voltage regulation value to generate a voltage regulator over-limit prediction index;

[0040] Obtain the load value of the high-speed rail in operation during the monitoring period, calculate the average of all load values, and generate the load average;

[0041] Calculate the difference between the load values ​​in adjacent monitoring periods to generate a load change value;

[0042] Calculate the average of all load change values ​​within the monitoring period to generate an average load change value;

[0043] The average load change value is calculated by ratio with the load mean to generate the high-speed rail load index;

[0044] A power supply risk prediction model is established, and the voltage state risk index, voltage stabilizer over-limit prediction index and high-speed rail load index are substituted into the power supply risk prediction model to generate the high-speed rail traction power supply risk value FX.

[0045] The expression of the power supply risk prediction model is:

[0046] ;

[0047] In the expression of the power supply risk prediction model, FX represents the high-speed rail traction power supply risk value, ZT represents the voltage state risk index, WY represents the voltage regulator over-limit prediction index, FZ represents the high-speed rail load index, TQ represents the voltage regulator working environment compliance index, and α, β, and γ are all weight coefficients.

[0048] The method for obtaining the working environment compliance index of the voltage stabilizer is as follows:

[0049] Obtain the temperature and humidity values ​​of the working environment of the voltage stabilizer, substitute the temperature and humidity values ​​into the working environment evaluation model, and generate the voltage stabilizer working environment compliance index TQ;

[0050] The expression of the working environment evaluation model is:

[0051] ;

[0052] In the expression of the working environment evaluation model, T represents the average temperature of the working environment of the regulator during the monitoring period. It represents the standard temperature value of the working environment of the voltage stabilizer, and H represents the average humidity value of the working environment of the voltage stabilizer during the monitoring period. It indicates the standard humidity value of the working environment of the voltage stabilizer. AC and BC are both proportional coefficients.

[0053] Preferably, judging whether the high-speed railway traction power supply needs to switch the power supply mode according to the high-speed railway traction power supply risk value and generating the power supply mode switching demand signal specifically includes:

[0054] A high-speed rail traction power supply risk threshold is preset, and the high-speed rail traction power supply risk value is compared with the high-speed rail traction power supply risk threshold; wherein the high-speed rail traction power supply risk threshold refers to the highest value of the high-speed rail traction power supply risk value under the standard state;

[0055] If the high-speed railway traction power supply risk value is less than or equal to the high-speed railway traction power supply risk threshold, it means that the lower the high-speed railway traction power supply risk value is, the more the current contact line state meets the requirements of high-speed railway traction power supply, and a small signal of power supply mode switching demand is generated;

[0056] If the high-speed railway traction power supply risk value is greater than the high-speed railway traction power supply risk threshold, it means that the higher the high-speed railway traction power supply risk value, the more unable the current state of the contact line is to meet the requirements of the high-speed railway traction power supply, and a large signal of the power supply mode switching demand is generated; when a large signal of the power supply mode switching demand is received, the power supply mode of the high-speed railway traction power supply is switched.

[0057] A high-speed railway traction power supply monitoring system, the monitoring system is used to execute the above method, the monitoring system comprises:

[0058] A voltage state risk analysis unit is used to set a monitoring cycle, divide the monitoring cycle into several monitoring time periods, obtain the voltage value of the contact line within the monitoring time period, and generate a voltage state risk index;

[0059] A voltage state judgment module is used to judge whether the voltage of the contact line is normal according to the voltage state risk index and generate a voltage state signal; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal;

[0060] The high-speed rail traction power supply risk analysis unit is used to generate a high-speed rail traction power supply risk value based on the voltage state poor signal, the voltage state risk index, the voltage regulator data and the high-speed rail load data; wherein the voltage regulator data refers to the rated voltage adjustment value of the voltage regulator, and the high-speed rail load data refers to the load value of the high-speed rail during operation during the monitoring period; the rated voltage adjustment value of the voltage regulator refers to the standard value that the voltage regulator can adjust to the voltage fluctuation occurring in the high-speed rail traction power supply;

[0061] The power supply mode switching demand judgment module is used to judge whether the high-speed railway traction power supply needs to switch the power supply mode according to the high-speed railway traction power supply risk value, and generate a power supply mode switching demand signal; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

[0062] Preferably, the voltage state risk analysis unit includes:

[0063] A voltage difference degree value generating module is used to set a monitoring period, divide the monitoring period into a number of monitoring time periods, obtain the voltage value of the contact line within the monitoring time period, and generate the voltage difference degree value of the contact line;

[0064] The abnormal period ratio generation module is used to obtain the voltage change value within the monitoring period and generate the abnormal period ratio within the monitoring cycle; wherein the voltage change value refers to the difference between the voltage values ​​of adjacent monitoring periods;

[0065] A voltage variation excess value generation module is used to obtain a voltage variation excess value and generate a voltage variation excess value; wherein the voltage variation excess value refers to a value of the voltage variation value exceeding a normal voltage fluctuation range;

[0066] The voltage state risk index generation module is used to perform weighted summation of the voltage change excess degree value, the abnormal time period proportion and the voltage difference degree value to generate the voltage state risk index of the contact line within the monitoring period.

[0067] Preferably, the high-speed railway traction power supply risk analysis unit includes:

[0068] A voltage regulator over-limit prediction index generation module, used to generate a voltage regulator over-limit prediction index according to a voltage regulator rated voltage adjustment value;

[0069] A high-speed rail load index generation module is used to obtain the load value of the high-speed rail and generate a high-speed rail load index;

[0070] The high-speed rail traction power supply risk value generation module is used to establish a power supply risk prediction model, substitute the voltage state risk index, the voltage stabilizer over-limit prediction index and the high-speed rail load index into the power supply risk prediction model, and generate the high-speed rail traction power supply risk value.

[0071] A high-speed rail traction power supply monitoring method and system provided in an embodiment of the present invention can monitor the voltage status on the contact line and, in combination with the working condition of the voltage stabilizer, determine whether the high-speed rail traction power supply mode needs to be switched to prevent damage to the voltage stabilizer, thereby improving the stability and safety of the high-speed rail during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 A flowchart of a high-speed railway traction power supply monitoring method provided by an embodiment of the present invention;

[0073] Figure 2 A flowchart of step S10 provided in an embodiment of the present invention;

[0074] Figure 3 A flowchart of step S30 provided in an embodiment of the present invention;

[0075] Figure 4 A module block diagram of a high-speed railway traction power supply monitoring system provided by an embodiment of the present invention;

[0076] Figure 5 A module block diagram of a voltage state risk analysis unit provided in an embodiment of the present invention;

[0077] Figure 6 A module block diagram of a high-speed rail traction power supply risk analysis unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0078] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0079] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0080] like Figure 1 As shown, an embodiment of the present invention provides a high-speed railway traction power supply monitoring method, comprising the following steps:

[0081] S10: obtaining a voltage value of the contact line and generating a voltage state risk index of the contact line;

[0082] S20: judging whether the voltage of the contact line is normal according to the voltage state risk index, and generating a voltage state signal; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal;

[0083] S30: Based on the poor voltage state signal, a high-speed rail traction power supply risk value is generated according to the voltage state risk index, the voltage regulator data and the high-speed rail load data; wherein the voltage regulator data refers to the rated voltage adjustment value of the voltage regulator, and the high-speed rail load data refers to the load value of the high-speed rail during operation during the monitoring period; the rated voltage adjustment value of the voltage regulator refers to the standard value that the voltage regulator can adjust to the voltage fluctuation occurring in the high-speed rail traction power supply;

[0084] S40: judging whether the high-speed railway traction power supply needs to switch the power supply mode according to the risk value of the high-speed railway traction power supply, and generating a power supply mode switching demand signal; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

[0085] like Figure 2 As shown, as a preferred embodiment of the present invention, the S10 specifically includes the following steps:

[0086] S11: Setting a monitoring cycle, dividing the monitoring cycle into a number of monitoring time periods, and obtaining the voltage value of the contact line within the monitoring time period;

[0087] The time setting of the monitoring cycle includes but is not limited to one minute, ten minutes, half an hour, etc.;

[0088] By monitoring the voltage value on the contact line, the state of the power supply voltage of the high-speed railway traction power supply can be preliminarily determined;

[0089] It needs to be explained that the high-speed rail traction power supply system is divided into "power supply sections"; each traction substation extends two power supply routes, providing AC power of different phases to form a power supply section; during the operation of the train, it will pass through different power supply sections in turn. The voltage value of the contact line during the monitoring period refers to the voltage monitoring of the power supply section that the high-speed rail is about to pass or will pass after a certain period of time during the operation of the high-speed rail, ultimately ensuring that the high-speed rail can pass through the power supply section safely and smoothly;

[0090] The voltage values ​​in all monitoring periods are averaged to generate the voltage average of the contact line in the monitoring period;

[0091] Calculate the difference between the voltage mean and the preset voltage value to generate a voltage difference value;

[0092] The voltage difference value is calculated by ratio with the preset voltage value to generate a voltage difference degree value;

[0093] S12: Calculate the difference between the voltage values ​​of adjacent monitoring periods to generate a voltage change value of the monitoring period;

[0094] Compare the voltage change value with the normal voltage fluctuation range. If the voltage change value is within the normal voltage fluctuation range, it means that the voltage change during the monitoring period is within the normal fluctuation range, and then mark the monitoring period as a normal voltage change period.

[0095] If the voltage change value is not within the normal voltage fluctuation range, it means that the voltage change during the monitoring period exceeds the normal fluctuation range, and the monitoring period is marked as an abnormal voltage change period;

[0096] Obtain the number of periods of abnormal voltage change, calculate the ratio of the number of periods of abnormal voltage change to the total number of monitoring periods, and generate the abnormal period ratio of the periods of abnormal voltage change;

[0097] S13: Calculate the difference between the voltage change value during the voltage change abnormal period and the near end point of the normal voltage fluctuation range to generate a voltage change excess value;

[0098] It should be explained that the near end point of the normal voltage fluctuation range refers to the voltage change value and the closest one of the two end points of the normal voltage fluctuation range; in addition, the normal voltage fluctuation range refers to the normal fluctuation of voltage generated during the power transmission process;

[0099] The voltage variation excess value is calculated by ratio calculation with the near end point of the voltage normal fluctuation range to generate the voltage variation excess degree value;

[0100] S14: Perform a weighted summation of the voltage change excess value, the abnormal time period proportion and the voltage difference value to generate a voltage state risk index for the contact line within the monitoring period.

[0101] As a preferred embodiment of the present invention, the S20 specifically includes:

[0102] A voltage state risk index threshold is preset, and the voltage state risk index is compared with the voltage state risk index threshold; wherein the voltage state risk index threshold refers to the highest value of the voltage state risk index of the contact line under the standard state;

[0103] The calculation method of the voltage state risk index threshold is consistent with the calculation method of the voltage state risk index, which will not be repeated here; in addition, the value of the voltage state risk index threshold is set by relevant personnel in this field according to the requirements for the power supply voltage state during the operation of the high-speed railway;

[0104] If the voltage state risk index is less than or equal to the voltage state risk index threshold, it means that the lower the voltage state risk index is, the better the voltage state of the contact line is, and a voltage state good signal is generated; when the voltage state good signal is received, the voltage state of the contact line continues to be monitored;

[0105] If the voltage state risk index is greater than the voltage state risk index threshold, it means that the higher the voltage state risk index is, the worse the voltage state of the contact line is, and a poor voltage state signal is generated; when a poor voltage state signal is received, the cause of the poor voltage state of the contact line is analyzed.

[0106] like Figure 3 As shown, as a preferred embodiment of the present invention, the S30 specifically includes the following steps:

[0107] S31: Obtaining the average voltage of the contact line during the monitoring period, performing a difference calculation between the average voltage and the voltage required for high-speed rail operation, and obtaining the required voltage adjustment value;

[0108] Calculate the difference between the required voltage adjustment value and the rated voltage adjustment value of the voltage regulator to generate a voltage regulator adjustment residual value;

[0109] Calculate the ratio of the voltage regulator regulation residual value to the voltage regulator rated voltage regulation value to generate a voltage regulator over-limit prediction index;

[0110] The rated voltage regulation value of the voltage regulator refers to the maximum value of the voltage that can be regulated when the voltage regulator is working normally. This value is half of the difference between the input voltage value and the output voltage value of the voltage regulator.

[0111] S32: Obtain the load value of the high-speed railway in operation during the monitoring period, calculate the average of all load values, and generate a load average;

[0112] The load value refers to the electric energy consumed or the power borne by the equipment (such as motors, lighting equipment, etc.) connected to the two ends of the power supply system in the high-speed rail system. The load value of the high-speed rail in operation during the monitoring period mentioned in this embodiment refers to the power borne by the power equipment during the operation of the high-speed rail during the monitoring period;

[0113] Calculate the difference between the load values ​​in adjacent monitoring periods to generate a load change value;

[0114] Calculate the average of all load change values ​​within the monitoring period to generate an average load change value;

[0115] The average load change value is calculated by ratio with the load mean to generate the high-speed rail load index;

[0116] S33: Establish a power supply risk prediction model, substitute the voltage state risk index, the voltage regulator over-limit prediction index and the high-speed rail load index into the power supply risk prediction model, and generate a high-speed rail traction power supply risk value FX;

[0117] Among them, the expression of the power supply risk prediction model is:

[0118] ;

[0119] In the expression, ZT represents the voltage state risk index, WY represents the voltage regulator over-limit prediction index, FZ represents the high-speed rail load index, TQ represents the voltage regulator working environment compliance index, and α, β, and γ are all weight coefficients;

[0120] As a preferred embodiment of the present invention, the method for obtaining the working environment compliance index of the voltage stabilizer is:

[0121] Obtain the temperature and humidity values ​​of the working environment of the voltage stabilizer, substitute the temperature and humidity values ​​into the working environment evaluation model, and generate the voltage stabilizer working environment compliance index TQ;

[0122] Wherein, the expression of the working environment evaluation model is:

[0123] ;

[0124] In the expression, T represents the average temperature of the working environment of the voltage regulator during the monitoring period. It represents the standard value of the temperature of the working environment of the voltage stabilizer, and H represents the average humidity of the working environment of the voltage stabilizer during the monitoring period. It indicates the standard humidity value of the working environment of the voltage stabilizer. AC and BC are both proportional coefficients.

[0125] In this embodiment, the standard value of the temperature of the working environment of the stabilizer refers to the standard working environment temperature of the stabilizer during operation, and the temperature has the least impact on the operation of the stabilizer. The standard value of the humidity of the working environment of the stabilizer refers to the standard working environment humidity of the stabilizer during operation, and the humidity has the least impact on the operation of the stabilizer.

[0126] As a preferred embodiment of the present invention, the S40 specifically includes:

[0127] A high-speed rail traction power supply risk threshold is preset, and the high-speed rail traction power supply risk value is compared with the high-speed rail traction power supply risk threshold; wherein the high-speed rail traction power supply risk threshold refers to the highest value of the high-speed rail traction power supply risk value under the standard state;

[0128] The method for obtaining the high-speed rail traction power supply risk threshold is the same as the method for obtaining the high-speed rail traction power supply risk value, and its value is set by relevant personnel in this field;

[0129] If the high-speed railway traction power supply risk value is less than or equal to the high-speed railway traction power supply risk threshold, it means that the lower the high-speed railway traction power supply risk value is, the more the current contact line state meets the requirements of high-speed railway traction power supply, and a small signal of power supply mode switching demand is generated;

[0130] If the high-speed railway traction power supply risk value is greater than the high-speed railway traction power supply risk threshold, it means that the higher the high-speed railway traction power supply risk value, the more unable the current state of the contact line is to meet the requirements of the high-speed railway traction power supply, and a large signal of the power supply mode switching demand is generated; when a large signal of the power supply mode switching demand is received, the power supply mode of the high-speed railway traction power supply is switched.

[0131] like Figure 4 As shown, one embodiment of the present invention further provides a high-speed railway traction power supply monitoring system, comprising:

[0132] The voltage state risk analysis unit 10 is used to set a monitoring period, divide the monitoring period into a number of monitoring periods, obtain the voltage value of the contact line within the monitoring period, and generate a voltage state risk index;

[0133] The voltage state judgment module 20 is used to judge whether the voltage of the contact line is normal according to the voltage state risk index, and generate a voltage state signal; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal;

[0134] The high-speed rail traction power supply risk analysis unit 30 is used to generate a high-speed rail traction power supply risk value based on the voltage state poor signal, the voltage state risk index, the voltage regulator data and the high-speed rail load data; wherein the voltage regulator data refers to the rated voltage adjustment value of the voltage regulator, and the high-speed rail load data refers to the load value of the high-speed rail during operation during the monitoring period; the rated voltage adjustment value of the voltage regulator refers to the standard value that the voltage regulator can adjust to the voltage fluctuation occurring in the high-speed rail traction power supply;

[0135] The power supply mode switching demand judgment module 40 is used to judge whether the high-speed rail traction power supply needs to switch the power supply mode according to the high-speed rail traction power supply risk value, and generate a power supply mode switching demand signal; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

[0136] like Figure 5 As shown, as a preferred embodiment of the present invention, the voltage state risk analysis unit specifically includes:

[0137] The voltage difference degree value generating module 11 is used to set a monitoring period, divide the monitoring period into a number of monitoring time periods, obtain the voltage value of the contact line within the monitoring time period, and generate the voltage difference degree value of the contact line;

[0138] The abnormal period proportion generating module 12 is used to obtain the voltage change value within the monitoring period and generate the abnormal period proportion within the monitoring period; wherein the voltage change value refers to the difference between the voltage values ​​of adjacent monitoring periods;

[0139] The voltage variation exceeding degree value generating module 13 is used to obtain the voltage variation exceeding degree value and generate the voltage variation exceeding degree value; wherein the voltage variation exceeding degree value refers to the value of the voltage variation value exceeding the normal voltage fluctuation range;

[0140] The voltage state risk index generating module 14 is used to perform weighted summation of the voltage change excess degree value, the abnormal time period proportion and the voltage difference degree value to generate the voltage state risk index of the contact line within the monitoring period.

[0141] like Figure 6 As shown, as a preferred embodiment of the present invention, the high-speed railway traction power supply risk analysis unit specifically includes:

[0142] A voltage regulator over-limit prediction index generation module 31, used to generate a voltage regulator over-limit prediction index according to a voltage regulator rated voltage adjustment value;

[0143] A high-speed rail load index generating module 32 is used to obtain the load value of the high-speed rail and generate a high-speed rail load index;

[0144] The high-speed rail traction power supply risk value generation module 33 is used to establish a power supply risk prediction model, substitute the voltage state risk index, the voltage regulator over-limit prediction index and the high-speed rail load index into the power supply risk prediction model, and generate the high-speed rail traction power supply risk value.

[0145] The above-mentioned embodiments of the present invention provide a high-speed rail traction power supply monitoring method and system, which monitors the voltage state on the contact line and combines the working condition of the voltage stabilizer to determine whether the high-speed rail traction power supply mode needs to be switched to prevent damage to the voltage stabilizer, thereby improving the stability and safety of the high-speed rail during operation.

[0146] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed railway traction power supply monitoring method, characterized in that: include: Set a monitoring cycle, divide the monitoring cycle into several monitoring periods, obtain the voltage value of the contact line within the monitoring period, and generate a voltage state risk index; Specifically: Setting a monitoring cycle, dividing the monitoring cycle into a number of monitoring periods, obtaining the voltage value of the contact line within the monitoring period, and generating a voltage difference degree value of the contact line; Obtain the voltage change value within the monitoring period and generate the abnormal period ratio within the monitoring period; wherein the voltage change value refers to the difference between the voltage values ​​of adjacent monitoring periods; Obtaining a voltage variation excess value and generating a voltage variation excess degree value; wherein the voltage variation excess value refers to a value of the voltage variation value exceeding a normal voltage fluctuation range; The voltage change excess value, abnormal period proportion and voltage difference value are weighted and summed to generate the voltage state risk index of the contact line within the monitoring period; According to the voltage state risk index, whether the voltage of the contact line is normal is judged, and a voltage state signal is generated; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal; Based on the poor voltage status signal, the high-speed rail traction power supply risk value is generated according to the voltage status risk index, voltage regulator data and high-speed rail load data; specifically: Obtain the average voltage of the contact line during the monitoring period, calculate the difference between the average voltage and the voltage required for high-speed rail operation, and obtain the required voltage adjustment value; Calculate the difference between the required voltage adjustment value and the rated voltage adjustment value of the voltage regulator to generate a voltage regulator adjustment residual value; Calculate the ratio of the voltage regulator regulation residual value to the voltage regulator rated voltage regulation value to generate a voltage regulator over-limit prediction index; Obtain the load value of the high-speed rail in operation during the monitoring period, calculate the average of all load values, and generate the load average; Calculate the difference between the load values ​​in adjacent monitoring periods to generate a load change value; Calculate the average of all load change values ​​within the monitoring period to generate an average load change value; The average load change value is calculated by ratio with the load mean to generate the high-speed rail load index; Establish a power supply risk prediction model, substitute the voltage state risk index, voltage regulator over-limit prediction index and high-speed rail load index into the power supply risk prediction model, and generate the high-speed rail traction power supply risk value FX; The expression of the power supply risk prediction model is: ; In the expression of the power supply risk prediction model, FX represents the risk value of high-speed rail traction power supply, ZT represents the voltage state risk index, WY represents the voltage regulator over-limit prediction index, FZ represents the high-speed rail load index, TQ represents the voltage regulator working environment compliance index, and α, β, and γ are all weight coefficients; The method for obtaining the working environment compliance index of the voltage stabilizer is as follows: Obtain the temperature and humidity values ​​of the working environment of the voltage stabilizer, substitute the temperature and humidity values ​​into the working environment evaluation model, and generate the voltage stabilizer working environment compliance index TQ; The expression of the working environment evaluation model is: ; In the expression of the working environment evaluation model, T represents the average temperature of the working environment of the regulator during the monitoring period. It represents the standard temperature value of the working environment of the voltage stabilizer, and H represents the average humidity value of the working environment of the voltage stabilizer during the monitoring period. It indicates the standard humidity value of the working environment of the voltage stabilizer. AC and BC are both proportional coefficients. According to the high-speed railway traction power supply risk value, it is determined whether the high-speed railway traction power supply needs to switch the power supply mode, and a power supply mode switching demand signal is generated; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

2. A high-speed railway traction power supply monitoring method according to claim 1, characterized in that: The monitoring cycle is set to divide the monitoring cycle into a number of monitoring periods, obtain the voltage value of the contact line within the monitoring period, and generate the voltage state risk index, specifically including: Setting a monitoring cycle, dividing the monitoring cycle into a number of monitoring time periods, and obtaining the voltage value of the contact line within the monitoring time period; The voltage values ​​in all monitoring periods are averaged to generate the voltage average of the contact line in the monitoring period; Calculate the difference between the voltage mean and the preset voltage value to generate a voltage difference value; Calculate the ratio of the voltage difference value to the preset voltage value to generate a voltage difference degree value; Calculate the difference between the voltage values ​​of adjacent monitoring periods to generate the voltage change value of the monitoring period; Compare the voltage change value with the normal voltage fluctuation range. If the voltage change value is within the normal voltage fluctuation range, it means that the voltage change during the monitoring period is within the normal fluctuation range, and then mark the monitoring period as a normal voltage change period. If the voltage change value is not within the normal voltage fluctuation range, it means that the voltage change during the monitoring period exceeds the normal fluctuation range, and the monitoring period is marked as an abnormal voltage change period; Obtain the number of periods of abnormal voltage change, calculate the ratio of the number of periods of abnormal voltage change to the total number of monitoring periods, and generate the abnormal period ratio of the periods of abnormal voltage change; The voltage change value during the abnormal voltage change period is calculated by difference with the near end point of the normal voltage fluctuation range to generate the voltage change excess value; wherein the near end point of the normal voltage fluctuation range refers to the voltage change value which is closest to the two end points of the normal voltage fluctuation range; The voltage variation excess value is calculated by ratio calculation with the near end point of the voltage normal fluctuation range to generate the voltage variation excess degree value; The voltage change excess value, abnormal period proportion and voltage difference value are weighted and summed to generate the voltage status risk index of the contact line during the monitoring period.

3. A high-speed railway traction power supply monitoring method according to claim 1, characterized in that: The step of judging whether the voltage of the contact line is normal according to the voltage state risk index and generating a voltage state signal specifically includes: A voltage state risk index threshold is preset, and the voltage state risk index is compared with the voltage state risk index threshold; wherein the voltage state risk index threshold refers to the highest value of the voltage state risk index of the contact line under the standard state; If the voltage state risk index is less than or equal to the voltage state risk index threshold, it means that the lower the voltage state risk index is, the better the voltage state of the contact line is, and a voltage state good signal is generated; when the voltage state good signal is received, the voltage state of the contact line continues to be monitored; If the voltage state risk index is greater than the voltage state risk index threshold, it means that the higher the voltage state risk index is, the worse the voltage state of the contact line is, and a poor voltage state signal is generated; when a poor voltage state signal is received, the cause of the poor voltage state of the contact line is analyzed.

4. The high-speed railway traction power supply monitoring method according to claim 1, characterized in that: The step of judging whether the high-speed railway traction power supply needs to switch the power supply mode according to the high-speed railway traction power supply risk value and generating a power supply mode switching demand signal specifically includes: A high-speed rail traction power supply risk threshold is preset, and the high-speed rail traction power supply risk value is compared with the high-speed rail traction power supply risk threshold; wherein the high-speed rail traction power supply risk threshold refers to the highest value of the high-speed rail traction power supply risk value under the standard state; If the high-speed railway traction power supply risk value is less than or equal to the high-speed railway traction power supply risk threshold, it means that the lower the high-speed railway traction power supply risk value is, the more the current contact line state meets the requirements of high-speed railway traction power supply, and a small signal of power supply mode switching demand is generated; If the high-speed railway traction power supply risk value is greater than the high-speed railway traction power supply risk threshold, it means that the higher the high-speed railway traction power supply risk value, the more unable the current state of the contact line is to meet the requirements of the high-speed railway traction power supply, and a large signal of the power supply mode switching demand is generated; when a large signal of the power supply mode switching demand is received, the power supply mode of the high-speed railway traction power supply is switched.

5. A high-speed railway traction power supply monitoring system, characterized in that: The monitoring system is used to execute the method described in any one of claims 1 to 4, and the monitoring system comprises: A voltage state risk analysis unit is used to set a monitoring cycle, divide the monitoring cycle into several monitoring time periods, obtain the voltage value of the contact line within the monitoring time period, and generate a voltage state risk index; A voltage state judgment module is used to judge whether the voltage of the contact line is normal according to the voltage state risk index and generate a voltage state signal; wherein the voltage state signal includes a good voltage state signal and a poor voltage state signal; A high-speed rail traction power supply risk analysis unit is used to generate a high-speed rail traction power supply risk value based on a poor voltage state signal, a voltage state risk index, voltage regulator data, and high-speed rail load data; The power supply mode switching demand judgment module is used to judge whether the high-speed railway traction power supply needs to switch the power supply mode according to the high-speed railway traction power supply risk value, and generate a power supply mode switching demand signal; wherein the power supply mode switching demand signal includes a large power supply mode switching demand signal and a small power supply mode switching demand signal.

6. A high-speed railway traction power supply monitoring system according to claim 5, characterized in that: The voltage state risk analysis unit includes: A voltage difference degree value generating module is used to set a monitoring period, divide the monitoring period into a number of monitoring time periods, obtain the voltage value of the contact line within the monitoring time period, and generate the voltage difference degree value of the contact line; The abnormal period ratio generation module is used to obtain the voltage change value within the monitoring period and generate the abnormal period ratio within the monitoring cycle; wherein the voltage change value refers to the difference between the voltage values ​​of adjacent monitoring periods; A voltage variation excess value generation module is used to obtain a voltage variation excess value and generate a voltage variation excess value; wherein the voltage variation excess value refers to a value of the voltage variation value exceeding a normal voltage fluctuation range; The voltage state risk index generation module is used to perform weighted summation of the voltage change excess degree value, the abnormal time period proportion and the voltage difference degree value to generate the voltage state risk index of the contact line within the monitoring period.

7. A high-speed railway traction power supply monitoring system according to claim 5, characterized in that: The high-speed rail traction power supply risk analysis unit includes: A voltage regulator over-limit prediction index generation module, used to generate a voltage regulator over-limit prediction index according to a voltage regulator rated voltage adjustment value; A high-speed rail load index generation module is used to obtain the load value of the high-speed rail and generate a high-speed rail load index; The high-speed rail traction power supply risk value generation module is used to establish a power supply risk prediction model, substitute the voltage state risk index, the voltage stabilizer over-limit prediction index and the high-speed rail load index into the power supply risk prediction model, and generate the high-speed rail traction power supply risk value.

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