Early warning method and device for insulation abnormity of traction motor

Abstract

The invention provides a traction motor insulation abnormity early warning method and device. The corresponding traction motor insulation abnormity early warning method comprises the following steps: acquiring a grounding voltage signal of a traction motor system according to a grounding detection circuit preset in the traction motor system; setting a time window according to the configuration parameters of the grounding detection circuit and the insulation safety parameters of the traction motor system; and according to the envelope line difference value of the grounding voltage signal and the time window, early warning is carried out on the insulation abnormal working condition of the traction motor system. According to the invention, the grounding voltage of the traction converter is directly extracted to monitor the insulation state of the traction motor, the existing structure and the diagnosis circuit of the traction converter are fully utilized, early warning is carried out before the insulation abnormity of the traction motor occurs, and the safety of the system is improved.

Description

Technical Field

[0001] The present application belongs to the field of rail transit technology, and specifically relates to the field of fault diagnosis technology for traction systems of rail transit locomotives and vehicles, and in particular to a method and device for early warning of abnormal insulation of a traction motor. Background Art

[0002] As we all know, the traction electric drive system is the core of the railway locomotive vehicle to achieve electromechanical energy conversion, and the traction motor constitutes the power source of the traction system. At present, AC asynchronous motors are widely used in electric locomotives due to their low cost and high robustness. As a key component of electrical transmission, traction motor fault detection is particularly important to ensure the safe and reliable operation of electric locomotives.

[0003] In the specific application conditions of the actual vehicle, the working environment of the traction motor is very harsh. Since the traction motor is in a non-confined space, it needs to cope with drastic changes in the climate environment and adapt to extreme weather conditions such as wind, frost, rain and snow. At the same time, the traction motor needs to cope with the continuous and rapid changes in torque load, quickly switch between different modes such as starting, traction, braking, inertia, high acceleration, and high power, and withstand the impact and vibration of the wheel-rail transmission system. Under the combined effects of these electrical, magnetic, thermal and mechanical stresses, the motor will suffer fatigue damage, and the performance will gradually degrade, resulting in irreversible failure. At this stage, most motor failures are caused by abnormal insulation failures between the turns of the stator winding. As the insulation abnormality gradually worsens, it will gradually develop into a phase-to-phase short circuit fault and a phase-to-ground fault, and in severe cases, the motor will even burn out.

[0004] In the prior art, the inspection of insulation abnormality usually uses the motor current to extract the negative sequence component. When the negative sequence current value exceeds the range, it is judged that the motor insulation is abnormal and there is a turn-to-turn or phase-to-phase short circuit. On the one hand, this detection method cannot avoid misjudgment caused by control mismatch. On the other hand, it is only performed after the fault occurs, and it is impossible to provide early fault warning. Summary of the invention

[0005] The present invention addresses the technical pain points of existing methods for extracting negative-sequence components of motor current, namely, the inability to avoid misjudgment caused by control mismatch and the inability to provide early warning, and provides a traction motor insulation abnormality warning method and device based on high-precision acquisition of ground voltage and envelope extraction.

[0006] In order to solve the technical problems in the background technology of this application, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a traction motor insulation abnormality early warning method, the method comprising:

[0008] Acquiring a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0009] Setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system;

[0010] An abnormal insulation condition of the traction motor system is warned based on the envelope difference of the ground voltage signal and the time window.

[0011] In some embodiments of the present application, warning of abnormal insulation condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window includes:

[0012] Calculate the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, and the time corresponding to the minimum voltage of the envelope difference in the time window;

[0013] The abnormal insulation condition is warned according to the maximum voltage, the minimum voltage, the moment corresponding to the maximum voltage, the moment corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

[0014] In some embodiments of the present application, warning the abnormal insulation condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system, and the time window includes:

[0015] Calculating the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage and the minimum voltage;

[0016] Calculate the peak time interval within the time window according to the time corresponding to the maximum voltage and the time corresponding to the minimum voltage;

[0017] The abnormal insulation condition is warned based on the magnitude relationship between the voltage fluctuation amplitude and the voltage warning value and the magnitude relationship between the peak time interval and the time window.

[0018] In some embodiments of the present application, the step of setting the ground detection circuit includes:

[0019] After the first resistor and the second resistor are connected in series, they are respectively connected to the positive bus and the secondary bus of the traction motor system;

[0020] Any one of the first resistor and the second resistor is connected in parallel with the capacitor;

[0021] The voltage across the capacitor is collected by a PHM board to obtain the voltage signal.

[0022] In some embodiments of the present application, the configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

[0023] In some embodiments of the present application, setting the time window according to the configuration parameters of the ground detection circuit and the insulation safety parameters of the traction motor system includes:

[0024] The time window is set according to a product of the capacitance value and the lowest resistance value.

[0025] In a second aspect, the present invention provides a traction motor insulation abnormality warning device, the device comprising:

[0026] A ground voltage signal acquisition module, used for acquiring a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0027] A time window setting module, used to set the time window according to the configuration parameters of the ground detection circuit and the insulation safety parameters of the traction motor system;

[0028] The insulation abnormality working condition warning module is used to warn of the insulation abnormality working condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0029] In some embodiments of the present application, the insulation abnormality condition warning module includes:

[0030] A maximum value calculation unit, used for calculating the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage and the time corresponding to the minimum voltage of the envelope difference in the time window;

[0031] The first insulation abnormal condition warning unit is used to warn of the insulation abnormal condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

[0032] In some embodiments of the present application, the first insulation abnormality condition warning unit includes:

[0033] a voltage fluctuation amplitude calculation unit, configured to calculate the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage value and the minimum voltage value;

[0034] A peak time interval calculation unit, used to calculate the peak time interval within the time window according to the time corresponding to the maximum voltage and the time corresponding to the minimum voltage;

[0035] The second insulation abnormal working condition warning unit is used to warn the insulation abnormal working condition according to the size relationship between the voltage fluctuation amplitude and the voltage warning value and the size relationship between the peak time interval and the time window.

[0036] In some embodiments of the present application, a traction motor insulation abnormality warning device further includes:

[0037] A circuit setting module, used to set the ground detection circuit; the circuit setting module includes:

[0038] A resistor connecting unit, used for connecting the first resistor and the second resistor in series and then connecting them to the positive bus and the auxiliary bus of the traction motor system respectively;

[0039] A capacitor connecting unit, used for connecting any one of the first resistor and the second resistor in parallel with a capacitor;

[0040] The voltage acquisition unit is used to acquire the voltage across the capacitor through a PHM board to obtain the voltage signal.

[0041] In some embodiments of the present application, the configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

[0042] In some embodiments of the present application, the time window setting module includes:

[0043] A time window setting unit is used to set the time window according to the product of the capacitance value and the minimum resistance value.

[0044] In a third aspect, the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of a traction motor insulation abnormality warning method.

[0045] In a fourth aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of a traction motor insulation abnormality warning method when executing the program.

[0046] In a fifth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a traction motor insulation abnormality warning method.

[0047] From the above description, it can be seen that an embodiment of the present invention provides a traction motor insulation abnormality warning method and device, and the corresponding traction motor insulation abnormality warning method includes: first, obtaining the grounding voltage signal of the traction motor system according to the grounding detection circuit pre-set in the traction motor system; then, setting the time window according to the configuration parameters of the grounding detection circuit and the insulation safety parameters of the traction motor system; finally, warning of the abnormal insulation condition of the traction motor system according to the envelope difference of the grounding voltage signal and the time window.

[0048] The corresponding traction motor insulation abnormality warning device includes: a ground voltage signal acquisition module, which is used to obtain the ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system; a time window setting module, which is used to set the time window according to the configuration parameters of the ground detection circuit and the insulation safety parameters of the traction motor system; an insulation abnormality operating condition warning module, which is used to warn of the insulation abnormality of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0049] In summary, the present invention directly extracts the ground voltage of the traction inverter to monitor the insulation status of the traction motor, making full use of the existing structure and diagnostic circuit of the traction inverter to provide early warning before the insulation abnormality of the traction motor occurs, thereby improving the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of a traction motor insulation abnormality warning method provided by an embodiment of the present invention Figure 1 ;

[0052] Figure 2 A schematic diagram of the structure of a traction motor system provided by an embodiment of the present invention;

[0053] Figure 3 A schematic flow chart of step 300 of a method for switching an excitation drive sequential control mode of a distributed phase regulator provided by an embodiment of the present invention;

[0054] Figure 4 A schematic flow chart of step 302 of a method for switching an excitation drive sequential control mode of a distributed phase regulator provided by an embodiment of the present invention;

[0055] Figure 5A schematic diagram of a traction motor insulation abnormality warning method provided by an embodiment of the present invention Figure 2 ;

[0056] Figure 6 A flow chart of step 400 of a method for switching an excitation drive sequential control mode of a distributed phase regulator provided by an embodiment of the present invention;

[0057] Figure 7 A schematic flow chart of step 200 of a method for switching an excitation drive sequential control mode of a distributed phase regulator provided by an embodiment of the present invention;

[0058] Figure 8 A flow chart of a traction motor insulation abnormality early warning method provided for a specific application example of the present invention;

[0059] Fig. 9 A schematic diagram of ground voltage and envelope waveform provided for a specific application example of the present invention;

[0060] Fig.10 A schematic diagram of voltage fluctuation amplitude and time interval provided for a specific application example of the present invention;

[0061] Fig.11 A schematic diagram of the structure of a traction motor insulation abnormality warning device according to an embodiment of the present invention Figure 1 ;

[0062] Fig.12 Schematic diagram of the structure of the abnormal insulation condition warning module 30 in an embodiment of the present invention;

[0063] Fig.13 2 is a schematic diagram of the structure of the first insulation abnormality warning unit 30b in an embodiment of the present invention;

[0064] Fig.14 A schematic diagram of the structure of a traction motor insulation abnormality warning device according to an embodiment of the present invention Figure 2 ;

[0065] Fig.15 is a schematic diagram of the structure of the circuit setting module 40 in an embodiment of the present invention;

[0066] Fig.16 It is a structural schematic diagram of the time window setting module 20 in an embodiment of the present invention;

[0067] Fig.17 It is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] It should be noted that the terms "including" and "having" in the specification and claims of the present application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. In the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0071] The embodiment of the present invention provides a specific implementation of a traction motor insulation abnormality warning method, see Figure 1 , the method comprising:

[0072] Step 100: obtaining a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0073] Step 200: setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system;

[0074] Step 300: Warning of abnormal insulation condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0075] From the above description, it can be seen that an embodiment of the present invention provides a traction motor insulation abnormality warning method, including: first, obtaining a grounding voltage signal of the traction motor system according to a grounding detection circuit pre-set in the traction motor system; then, setting a time window according to the configuration parameters of the grounding detection circuit and the insulation safety parameters of the traction motor system; finally, warning of abnormal insulation conditions of the traction motor system according to the envelope difference of the grounding voltage signal and the time window.

[0076] In summary, the present invention proposes an effective early warning method for insulation abnormality of a traction motor based on high-precision acquisition of ground voltage and envelope extraction.

[0077] In some embodiments of the present application, see Figure 2 The traction motor system in step 100 includes: a traction transformer, a four-quadrant rectifier, an intermediate DC circuit, a traction inverter and a traction motor. Specifically:

[0078] Traction transformers are used to reduce the high voltage (usually 25kV AC) on the contact network to a lower voltage suitable for subsequent rectifiers and inverters. They are an important interface between the power transmission system and the train power system. Traction transformers are used to provide suitable voltage and current to subsequent equipment, while achieving electrical isolation and voltage conversion.

[0079] The four-quadrant rectifier can convert AC to DC and can operate in four quadrants, which means it can handle current and voltage in both positive and negative directions, enabling bidirectional flow of energy. It can not only rectify, but also perform energy feedback (return braking energy to the grid). The four-quadrant rectifier can improve energy efficiency, especially during braking, by feeding regenerative energy back into the grid and saving energy.

[0080] The intermediate DC circuit is the DC bus system between the rectifier and the inverter. It stores and transmits rectified DC power and provides a stable DC voltage to the inverter. The intermediate DC circuit can ensure the stable transmission of power and provide a stable DC power supply for the subsequent inverter.

[0081] The traction inverter converts the DC power provided by the intermediate DC circuit into AC power suitable for the traction motor. It is usually controlled by PWM (pulse width modulation) technology. The traction inverter can accurately control the speed and torque of the motor to ensure smooth starting, acceleration, operation and braking of the train.

[0082] Traction motors are devices that convert electrical energy into mechanical energy and directly drive the train wheels. Traction motors are used to provide driving force to enable the train to accelerate, decelerate and maintain speed. Usually three-phase AC induction motors or permanent magnet synchronous motors are used.

[0083] In addition, the following two situations may cause the generation and change of the ground voltage signal of the traction motor system:

[0084] Leakage current in traction motor system: Due to insulation aging, damage or environmental humidity, the traction motor and its related electrical equipment may experience leakage, generating a ground voltage signal.

[0085] Failure of electrical equipment: Equipment failure or short circuit may cause the equipment casing or non-electrical parts to become energized, generating ground voltage.

[0086] For step 200 , the configuration parameters may be the resistance value of a resistor and the capacitance value of a capacitor used in the ground detection circuit, and the like.

[0087] For step 300, first, the maximum voltage, the minimum voltage, the moment corresponding to the maximum voltage, and the moment corresponding to the minimum voltage corresponding to the envelope difference in the time window are calculated; then, the voltage fluctuation amplitude of the traction motor system in the time window is calculated based on the maximum voltage and the minimum voltage; the peak time interval in the time window is calculated based on the moment corresponding to the maximum voltage and the moment corresponding to the minimum voltage; finally, an abnormal insulation condition is warned based on the relationship between the voltage fluctuation amplitude and the voltage warning value and the relationship between the peak time interval and the time window.

[0088] In some embodiments of the present application, see Figure 3 , step 300 comprises:

[0089] Step 301: Calculate the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, and the time corresponding to the minimum voltage of the envelope difference in the time window;

[0090] Specifically, set the time window T = 1.5*C1*R limit , where C1 is the capacitance of the grounding detection circuit, R limit The minimum resistance allowed by the normal range of traction motor insulation. Extract the ground voltage envelope difference Env (dif) The maximum voltage U in the time window T[n](T) max [n], the maximum value at the time t max [n], and the minimum voltage U min [n], the minimum value at time t min [n].

[0091] Step 302: Warning of the abnormal insulation condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

[0092] In some embodiments of the present application, see Figure 4 , step 302 comprises:

[0093] Step 3021: Calculate the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage and the minimum voltage;

[0094] Specifically, calculate Env (dif) Voltage fluctuation amplitude U in the time window T[n] amp [n]=U max [n]-U min [n].

[0095] Step 3022: Calculate the peak time interval within the time window according to the time corresponding to the maximum voltage and the time corresponding to the minimum voltage;

[0096] Specifically, calculate the peak time interval T d [n] = abs(t max [n]-t min [n]).

[0097] Step 3023: Warning the abnormal insulation condition based on the relationship between the voltage fluctuation amplitude and the voltage warning value and the relationship between the peak time interval and the time window.

[0098] First, set a suitable voltage warning value U warn , when U amp [n]≥U warn And T d When [n]≤T / 2, the insulation warning count value is N count Automatically increase by 1, when N count Greater than or equal to the insulation warning setting value N set When the traction motor insulation status is early warning;

[0099] In some embodiments of the present application, see Figure 5 , a traction motor insulation abnormality early warning method, further comprising:

[0100] Step 400: Setting the ground detection circuit. For details, see Figure 2 as well as Figure 6 , step 400 comprises:

[0101] Step 401: After the first resistor and the second resistor are connected in series, they are connected to the positive bus and the secondary bus of the traction motor system respectively;

[0102] The positive bus is the main power supply circuit of the entire traction motor system. It is usually composed of a large-capacity DC bus cable and is responsible for supplying power to the traction motor and other major power equipment. The voltage of the positive bus is adjusted and controlled by the corresponding power conversion equipment to ensure that a stable voltage is provided to the load.

[0103] The secondary bus is an auxiliary power supply circuit in the traction motor system. It provides power for some smaller devices and auxiliary circuits, such as lighting systems, air conditioning systems, etc. The secondary bus usually uses a cable with a smaller cross-section and a lower voltage than the positive bus, such as 24VDC or 110VAC. The power supply of the secondary bus can come from the power conversion equipment on the positive bus, such as a DC / DC converter or transformer.

[0104] Step 402: any one of the first resistor and the second resistor is connected in parallel with a capacitor;

[0105] Step 403: collecting the voltage across the capacitor through a PHM board to obtain the voltage signal.

[0106] In some embodiments of the present application, the configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

[0107] In some embodiments of the present application, see Figure 7 , step 200 comprises:

[0108] Step 201: setting the time window according to the product of the capacitance value and the minimum resistance value.

[0109] Specifically, set the time window T = 1.5*C1*R limit , where C1 is the capacitance of the grounding capacitor C1, R limit It is the minimum resistance allowed within the normal range of traction motor insulation.

[0110] From the above description, it can be seen that an embodiment of the present invention provides a traction motor insulation abnormality warning method, including: first, obtaining a grounding voltage signal of the traction motor system according to a grounding detection circuit pre-set in the traction motor system; then, setting a time window according to the configuration parameters of the grounding detection circuit and the insulation safety parameters of the traction motor system; finally, warning of abnormal insulation conditions of the traction motor system according to the envelope difference of the grounding voltage signal and the time window.

[0111] In summary, the present invention directly extracts the ground voltage of the traction inverter to monitor the insulation status of the traction motor, fully utilizes the existing structure and diagnostic circuit of the traction inverter to provide early warning when insulation abnormalities of the traction motor occur, and improves the safety of the system.

[0112] In order to further illustrate the solution, the present invention also provides a specific application example of a traction motor insulation abnormality warning method, see Figure 8 , the method comprises the following steps.

[0113] S1: A ground detection circuit is set in the EMU traction converter and a ground voltage signal is obtained.

[0114] Specifically, see Figure 2 , a ground detection circuit is set in the traction converter of the EMU. The circuit adopts a voltage division method in which resistors R1 and R2 are connected in series. A ground capacitor C1 is connected in parallel at both ends of the resistor R2. The voltage at both ends of the ground capacitor is collected in real time through the PHM board to obtain a ground voltage signal;

[0115] S2: Obtain the envelope difference.

[0116] Specifically, see Fig. 9 , using the envelope function, the ground voltage signal is differentially calculated to find the maximum and minimum values ​​to construct the envelope, thereby extracting the envelope of the ground voltage, where the upper limit of the envelope is recorded as Env (up) , the lower limit of the envelope is denoted as Env (lower) , find the envelope difference Env (dif) =Env (up) -Env (lower) .

[0117] S3: Setting a time window, and extracting the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, and the time corresponding to the minimum voltage.

[0118] Assume time window T = 1.5*C1*R limit , where C1 is the capacitance of the grounding capacitor C1, R limit The minimum resistance allowed by the normal range of traction motor insulation. Extract the ground voltage envelope difference Env (dif) The maximum voltage U in the time window T[n] max [n], the maximum value at the time t max [n], and the minimum voltage U min [n], the minimum value at time t min [n].

[0119] S4: Calculate the voltage fluctuation amplitude and peak time interval.

[0120] See also Fig.10 , calculate Env (dif) Voltage fluctuation amplitude U in the time window T[n] amp [n]=U max [n]-U min [n], and the peak time interval Td [n] = abs(t max [n]-t min [n]).

[0121] S5: Warning of abnormal insulation conditions of the traction motor system.

[0122] Set an appropriate voltage warning value U warn , when U amp [n]≥U warn And T d When [n]≤T / 2, the insulation warning count value is N count Automatically increase by 1, when N count Greater than or equal to the insulation warning setting value N set When the traction motor insulation status is early warning;

[0123] From the above description, it can be seen that a specific application example of the present invention provides a traction motor insulation abnormality warning method, including: first, obtaining a grounding voltage signal of the traction motor system according to a grounding detection circuit pre-set in the traction motor system; then, setting a time window according to the configuration parameters of the grounding detection circuit and the insulation safety parameters of the traction motor system; finally, warning of abnormal insulation conditions of the traction motor system according to the envelope difference of the grounding voltage signal and the time window.

[0124] In summary, the present invention directly extracts the ground voltage of the traction inverter to monitor the insulation status of the traction motor, fully utilizes the existing structure and diagnostic circuit of the traction inverter to provide early warning when insulation abnormalities of the traction motor occur, and improves the safety of the system.

[0125] Based on the same inventive concept, the embodiments of the present application also provide a traction motor insulation abnormality warning device, which can be used to implement the method described in the above embodiments, such as the following embodiments. Since the principle of solving the problem by the traction motor insulation abnormality warning device is similar to that of the traction motor insulation abnormality warning method, the implementation of the traction motor insulation abnormality warning device can refer to the implementation of the traction motor insulation abnormality warning method, and the repeated parts will not be repeated. As used below, the terms "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0126] The embodiment of the present invention provides a specific implementation of a traction motor insulation abnormality warning device capable of implementing a traction motor insulation abnormality warning method, see Fig.11 , a traction motor insulation abnormality warning device specifically includes the following contents:

[0127] A ground voltage signal acquisition module 10, configured to acquire a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0128] A time window setting module 20, configured to set a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system;

[0129] The insulation abnormality working condition warning module 30 is used to warn of the insulation abnormality working condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0130] In some embodiments of the present application, see Fig.12 , the insulation abnormality condition warning module 30 comprises:

[0131] A maximum value calculation unit 30a, used to calculate the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage and the time corresponding to the minimum voltage of the envelope difference in the time window;

[0132] The first insulation abnormal condition warning unit 30b is used to warn the insulation abnormal condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

[0133] In some embodiments of the present application, see Fig.13 The insulation abnormality condition warning first unit 30b includes:

[0134] A voltage fluctuation amplitude calculation unit 30b1, configured to calculate the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage and the minimum voltage;

[0135] A peak time interval calculation unit 30b2, configured to calculate a peak time interval within the time window according to a time corresponding to the maximum voltage value and a time corresponding to the minimum voltage value;

[0136] The second insulation abnormality condition warning unit 30b3 is used to warn the insulation abnormality condition according to the size relationship between the voltage fluctuation amplitude and the voltage warning value and the size relationship between the peak time interval and the time window.

[0137] In some embodiments of the present application, see Fig.14 , a traction motor insulation abnormality warning device, further comprising:

[0138] The circuit setting module 40 is used to set the ground detection circuit; see Fig.15, the circuit setting module 40 includes:

[0139] A resistor connecting unit 40a, used to connect the first resistor and the second resistor in series, and then connect them to the positive bus and the auxiliary bus of the traction motor system respectively;

[0140] A capacitor connecting unit 40b, configured to connect any one of the first resistor and the second resistor in parallel with a capacitor;

[0141] The voltage acquisition unit is used to acquire the voltage across the capacitor through a PHM board to obtain the voltage signal.

[0142] In some embodiments of the present application, the configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

[0143] In some embodiments of the present application, see Fig.16 , the time window setting module 20 includes:

[0144] The time window setting unit 20a is used to set the time window according to the product of the capacitance value and the minimum resistance value.

[0145] From the above description, it can be seen that an embodiment of the present invention provides a traction motor insulation abnormality warning device, including: a ground voltage signal acquisition module, used to obtain the ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system; a time window setting module, used to set the time window according to the configuration parameters of the ground detection circuit and the insulation safety parameters of the traction motor system; an insulation abnormality operating condition warning module, used to warn the traction motor system of the insulation abnormality condition according to the envelope difference of the ground voltage signal and the time window.

[0146] In summary, the present invention directly extracts the ground voltage of the traction inverter to monitor the insulation status of the traction motor, fully utilizes the existing structure and diagnostic circuit of the traction inverter to provide early warning when insulation abnormalities of the traction motor occur, and improves the safety of the system.

[0147] The embodiment of the present application also provides a specific implementation of an electronic device capable of implementing all steps in the traction motor insulation abnormality warning method in the above embodiment, see Fig.17 , electronic equipment specifically includes the following:

[0148] Processor (processor) 1201, memory (memory) 1202, communication interface (CommunicationsInterface) 1203 and bus 1204;

[0149] The processor 1201 , the memory 1202 , and the communication interface 1203 communicate with each other via the bus 1204 ; the communication interface 1203 is used to realize information transmission between relevant devices such as the server-side device, the power measurement device, and the user-side device.

[0150] The processor 1201 is used to call the computer program in the memory 1202. When the processor executes the computer program, all the steps in the traction motor insulation abnormality warning method in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0151] Step 100: obtaining a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0152] Step 200: setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system;

[0153] Step 300: Warning of abnormal insulation condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0154] The embodiment of the present application also provides a computer-readable storage medium capable of implementing all the steps of the traction motor insulation abnormality warning method in the above embodiment. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all the steps of the traction motor insulation abnormality warning method in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0155] Step 100: obtaining a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system;

[0156] Step 200: setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system;

[0157] Step 300: Warning of abnormal insulation condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

[0158] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0159] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0160] Although the present application provides method operation steps such as embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0161] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0162] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0163] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0164] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A traction motor insulation abnormality early warning method, characterized in that: include: Acquiring a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system; Setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system; An abnormal insulation condition of the traction motor system is warned based on the envelope difference of the ground voltage signal and the time window.

2. The early warning method according to claim 1, characterized in that: Warning of abnormal insulation condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window includes: Calculate the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, and the time corresponding to the minimum voltage of the envelope difference in the time window; The abnormal insulation condition is warned according to the maximum voltage, the minimum voltage, the moment corresponding to the maximum voltage, the moment corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

3. The early warning method according to claim 2, characterized in that: Warning the abnormal insulation condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window, includes: Calculating the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage and the minimum voltage; Calculate the peak time interval within the time window according to the time corresponding to the maximum voltage and the time corresponding to the minimum voltage; The abnormal insulation condition is warned based on the magnitude relationship between the voltage fluctuation amplitude and the voltage warning value and the magnitude relationship between the peak time interval and the time window.

4. The early warning method according to claim 1, characterized in that: The steps of setting the ground detection circuit include: After the first resistor and the second resistor are connected in series, they are respectively connected to the positive bus and the secondary bus of the traction motor system; Any one of the first resistor and the second resistor is connected in parallel with the capacitor; The voltage across the capacitor is collected by a PHM board to obtain the voltage signal.

5. The early warning method according to claim 4, characterized in that: The configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

6. The early warning method according to claim 5, characterized in that: Setting a time window according to configuration parameters of the ground detection circuit and insulation safety parameters of the traction motor system includes: The time window is set according to a product of the capacitance value and the lowest resistance value.

7. A traction motor insulation abnormality warning device, characterized in that: include: A ground voltage signal acquisition module, used for acquiring a ground voltage signal of the traction motor system according to a ground detection circuit pre-set in the traction motor system; A time window setting module, used to set the time window according to the configuration parameters of the ground detection circuit and the insulation safety parameters of the traction motor system; The insulation abnormality working condition warning module is used to warn of the insulation abnormality working condition of the traction motor system according to the envelope difference of the ground voltage signal and the time window.

8. The early warning device according to claim 7, characterized in that: The insulation abnormality working condition warning module comprises: A maximum value calculation unit, used for calculating the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage and the time corresponding to the minimum voltage of the envelope difference in the time window; The first insulation abnormal condition warning unit is used to warn of the insulation abnormal condition according to the maximum voltage, the minimum voltage, the time corresponding to the maximum voltage, the time corresponding to the minimum voltage, the preset voltage warning value of the traction motor system and the time window.

9. The early warning device according to claim 8, characterized in that: The insulation abnormality condition warning first unit comprises: a voltage fluctuation amplitude calculation unit, configured to calculate the voltage fluctuation amplitude of the traction motor system within the time window according to the maximum voltage value and the minimum voltage value; A peak time interval calculation unit, used to calculate the peak time interval within the time window according to the time corresponding to the maximum voltage value and the time corresponding to the minimum voltage value; The second insulation abnormal working condition warning unit is used to warn the insulation abnormal working condition according to the size relationship between the voltage fluctuation amplitude and the voltage warning value and the size relationship between the peak time interval and the time window.

10. The early warning device according to claim 7, characterized in that: Also includes: A circuit setting module, used for setting the ground detection circuit; The circuit setting module includes: A resistor connecting unit, used for connecting the first resistor and the second resistor in series and then connecting them to the positive bus and the auxiliary bus of the traction motor system respectively; A capacitor connecting unit, used for connecting any one of the first resistor and the second resistor in parallel with a capacitor; The voltage acquisition unit is used to acquire the voltage across the capacitor through a PHM board to obtain the voltage signal.

11. The early warning device according to claim 10, characterized in that: The configuration parameter is the capacitance value of the capacitor, and the insulation safety parameter is the minimum resistance value allowed by the traction motor system within a normal range.

12. The early warning device according to claim 11, characterized in that: The time window setting module includes: A time window setting unit is used to set the time window according to the product of the capacitance value and the minimum resistance value.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the traction motor insulation abnormality warning method described in any one of claims 1 to 6 are implemented.

14. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the traction motor insulation abnormality warning method according to any one of claims 1 to 6 are implemented.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the traction motor insulation abnormality warning method described in any one of claims 1 to 6 are implemented.

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