Method and device for determining state of electronic power switch for temporary overvoltage suppression device

Abstract

The invention provides a method and a device for judging the state of a power electronic switch for a temporary overvoltage suppression device. On-line judgment of the state of the power electronic switch is realized through the total current and the actual voltage of the power electronic switch. The limitation that the state of the power electronic switch is judged on the basis of collecting the voltages at the two ends of the switch unit in the power electronic switch in the related technology is overcome, a complex secondary power supply loop is not needed, the structure of the temporary overvoltage suppression device is simplified, meanwhile, the influence on potential distribution of the temporary overvoltage suppression device is avoided, and the reliability of the device is improved. And normal operation of the temporary overvoltage suppression device is ensured. According to the method, the environment temperature, the environment humidity and the environment pollution degree of the power electronic switch are considered, the total current growth proportion and the resistive current growth proportion are corrected, state judgment can be prevented from being interfered by changes of power electronic leakage current caused by environment conditions, the misjudgment probability is effectively reduced, and the reliability of state judgment is improved. And the judgment accuracy of the state of the electronic power switch is ensured.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a method and device for determining the state of a power electronic switch for a temporary overvoltage suppression device. Background Art

[0002] With the large-scale access of new energy units, in the event of a fault in the AC / DC system, due to the reverse regulation characteristics of the new energy units and the setting of the reactive compensation device, the new energy station, converter station or substation bus will generate a temporary overvoltage exceeding 1.3pu, affecting the safe and stable operation of the new energy units and converter stations.

[0003] Related technologies usually use overvoltage suppression devices to suppress temporary overvoltages. When a single-layer or multi-layer fault occurs in the thyristor of the power electronic switch in the overvoltage suppression device, it will be in a short-circuit state, which seriously affects the potential distribution of the overvoltage suppression device, causes the charge rate of the nonlinear resistor to increase, and accelerates the aging of the overvoltage suppression device. Related technologies usually use the voltage across the switch unit in the power electronic switch to determine the state of the power electronic switch. Since the acquisition module needs to be equipped with a more complex secondary power supply circuit, it will cause a large leakage current in the power electronic switch, and it will also affect the potential distribution of the temporary overvoltage suppression device, affecting the normal operation of the temporary overvoltage suppression device. Summary of the Invention

[0004] In order to solve the problems in the prior art that affect the normal operation of a temporary overvoltage suppression device, the present application provides a method for determining the state of a power electronic switch for a temporary overvoltage suppression device, which may include:

[0005] A total current growth ratio is calculated based on the total current of the power electronic switch. A first voltage fluctuation correction coefficient is calculated based on the actual voltage of the power electronic switch, and the total current growth ratio is corrected based on the first voltage fluctuation correction coefficient. The state of the power electronic switch is determined based on the corrected total current growth ratio.

[0006] In some possible implementations, calculating the first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch includes:

[0007] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch. The actual voltage change is fitted with the total current growth ratio to obtain a first voltage fluctuation proportional coefficient. A first voltage fluctuation correction coefficient is calculated based on the voltage fluctuation proportional coefficient of the total current growth ratio.

[0008] Exemplarily, the first voltage fluctuation correction coefficient satisfies:

[0009]

[0010] Among them, K UX Indicates the first voltage fluctuation correction coefficient, U t represents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX Indicates the first voltage fluctuation proportional coefficient.

[0011] In some other possible implementations, correcting the total current growth ratio according to the first voltage fluctuation correction coefficient includes:

[0012] The ambient temperature, ambient humidity, and ambient pollution level of the power electronic switch are collected. A first ambient temperature correction factor, a first ambient humidity correction factor, and a first ambient pollution level correction factor are determined based on the ambient temperature, ambient humidity, and ambient pollution level. The total current growth ratio is corrected based on the first voltage fluctuation correction factor, the first ambient temperature correction factor, the first ambient humidity correction factor, and the first ambient pollution level correction factor to obtain a corrected total current growth ratio.

[0013] Furthermore, determining a first ambient temperature correction coefficient, a first ambient humidity correction coefficient, and a first ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree includes:

[0014] The ambient temperature and the total current growth ratio are fitted to obtain a first ambient temperature correction coefficient. The ambient humidity and the total current growth ratio are fitted to obtain a first ambient humidity correction coefficient. The ambient pollution degree correction coefficient and the total current growth ratio are fitted to obtain a first ambient pollution degree correction coefficient.

[0015] Optionally, the corrected full current growth ratio satisfies:

[0016]

[0017] Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX Indicates the first ambient temperature correction coefficient, K PX Indicates the first ambient temperature correction coefficient, K HX Indicates the first environmental pollution correction coefficient, K UX Indicates the first voltage fluctuation correction coefficient, G X Indicates the total current growth ratio, S1, S2 and S3 are weight coefficients.

[0018] In another possible implementation, determining the state of the power electronic switch according to the corrected total current growth ratio includes:

[0019] If the corrected total current growth ratio is greater than or equal to a preset first growth ratio threshold, it is determined that the power electronic switch is in a fault state.

[0020] If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

[0021] Furthermore, the determination method provided by this application also includes:

[0022] The resistive current of the power electronic switch is collected, and the resistive current growth ratio is calculated based on the resistive current.

[0023] The resistive current growth ratio is corrected to obtain a corrected resistive current growth ratio.

[0024] The number of switch units in the fault state is determined according to the corrected resistive current growth ratio and in combination with the correlation between the corrected resistive current growth ratio and the number of switch units in the fault state in the power electronic switch.

[0025] Optionally, the resistive current growth ratio is corrected to obtain a corrected resistive current growth ratio, including:

[0026] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch.

[0027] The actual voltage change and the resistive current growth ratio are fitted to obtain a second voltage fluctuation proportional coefficient.

[0028] The ambient temperature, ambient humidity and ambient pollution degree of the power electronic switch are collected, and a second ambient temperature correction coefficient, a second ambient humidity correction coefficient and a second ambient pollution degree correction coefficient are determined according to the ambient temperature, ambient humidity and ambient pollution degree.

[0029] The resistive current growth ratio is corrected according to the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution degree correction coefficient to obtain a corrected resistive current growth ratio.

[0030] Furthermore, determining a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree includes:

[0031] The ambient temperature and the resistive current growth ratio are fitted to obtain a second ambient temperature correction coefficient.

[0032] The ambient humidity and the resistive current growth ratio are fitted to obtain a second ambient humidity correction coefficient.

[0033] The environmental pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain a second environmental pollution degree correction coefficient.

[0034] For example, the corrected resistive current growth ratio satisfies:

[0035]

[0036] Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR Indicates the second ambient temperature correction coefficient, K PR Indicates the second ambient temperature correction coefficient, K HR Indicates the second environmental pollution correction coefficient, K UR Represents the second voltage fluctuation correction coefficient, G R It represents the growth ratio of resistive current, and S1, S2 and S3 represent weight coefficients.

[0037] The relevant relationship meets:

[0038]

[0039] Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

[0040] The full current growth ratio meets the following requirements:

[0041]

[0042] Among them, G X Indicates the total current growth ratio, I Xt Represents the total current of the power electronic switch at time t, I Xt-1 Represents the total current of the power electronic switch at time t-1.

[0043] The resistive current growth ratio satisfies:

[0044]

[0045] Among them, G R Indicates the resistive current growth ratio, I Rt Represents the resistive current of the power electronic switch at time t, I Rt-1 Represents the resistive current of the power electronic switch at time t-1.

[0046] In a second aspect, the present application provides a power electronic switch state determination device for a temporary overvoltage suppression device, which may include:

[0047] The calculation module is used to calculate the full current growth ratio according to the full current of the power electronic switch.

[0048] The correction module is used to calculate a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch, and to correct the total current growth ratio according to the first voltage fluctuation correction coefficient.

[0049] The determination module is used to determine the state of the power electronic switch according to the corrected total current growth ratio.

[0050] In one possible implementation, the calculation module is specifically configured to:

[0051] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch.

[0052] The actual voltage change and the total current growth ratio are fitted to obtain a first voltage fluctuation proportional coefficient.

[0053] A first voltage fluctuation correction coefficient is calculated according to the voltage fluctuation proportional coefficient of the full current increase ratio.

[0054] Optionally, the first voltage fluctuation correction coefficient satisfies:

[0055]

[0056] Among them, K UX Indicates the first voltage fluctuation correction coefficient, U t represents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX Indicates the first voltage fluctuation proportional coefficient.

[0057] In another possible implementation, the correction module is specifically configured to:

[0058] Collect the ambient temperature, humidity and pollution level of power electronic switches.

[0059] A first ambient temperature correction coefficient, a first ambient humidity correction coefficient, and a first ambient pollution degree correction coefficient are determined according to the ambient temperature, the ambient humidity, and the ambient pollution degree.

[0060] The total current growth ratio is corrected according to the first voltage fluctuation correction coefficient, the first ambient temperature correction coefficient, the first ambient humidity correction coefficient, and the first ambient pollution degree correction coefficient to obtain a corrected total current growth ratio.

[0061] Furthermore, the correction module is specifically used to:

[0062] The ambient temperature and the total current growth ratio are fitted to obtain a first ambient temperature correction coefficient.

[0063] The ambient humidity and the total current growth ratio are fitted to obtain a first ambient humidity correction coefficient.

[0064] The environmental pollution degree correction coefficient and the total current growth ratio are fitted to obtain a first environmental pollution degree correction coefficient.

[0065] Optionally, the corrected full current growth ratio satisfies:

[0066]

[0067] Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX Indicates the first ambient temperature correction coefficient, K PX Indicates the first ambient temperature correction coefficient, K HX Indicates the first environmental pollution correction coefficient, K UX Indicates the first voltage fluctuation correction coefficient, G X Indicates the total current growth ratio, S1, S2 and S3 are weight coefficients.

[0068] In another possible implementation, the determination module is specifically configured to:

[0069] If the corrected total current growth ratio is greater than or equal to a preset first growth ratio threshold, it is determined that the power electronic switch is in a fault state.

[0070] If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

[0071] Furthermore, the calculation module is further used to: collect the resistive current of the power electronic switch, and calculate the resistive current growth ratio based on the resistive current.

[0072] The correction module is further used to correct the resistive current growth ratio to obtain a corrected resistive current growth ratio.

[0073] The determination module is further configured to determine the number of switch units in a faulty state according to the corrected resistive current growth ratio and in combination with a correlation between the corrected resistive current growth ratio and the number of switch units in a faulty state in the power electronic switch.

[0074] Optionally, the computing module is specifically used for:

[0075] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch.

[0076] The actual voltage change and the resistive current growth ratio are fitted to obtain a second voltage fluctuation proportional coefficient.

[0077] The ambient temperature, ambient humidity and ambient pollution degree of the power electronic switch are collected, and a second ambient temperature correction coefficient, a second ambient humidity correction coefficient and a second ambient pollution degree correction coefficient are determined according to the ambient temperature, ambient humidity and ambient pollution degree.

[0078] The resistive current growth ratio is corrected according to the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution degree correction coefficient to obtain a corrected resistive current growth ratio.

[0079] Furthermore, the calculation module is specifically used to:

[0080] The ambient temperature and the resistive current growth ratio are fitted to obtain a second ambient temperature correction coefficient.

[0081] The ambient humidity and the resistive current growth ratio are fitted to obtain a second ambient humidity correction coefficient.

[0082] The environmental pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain a second environmental pollution degree correction coefficient.

[0083] For example, the corrected resistive current growth ratio satisfies:

[0084]

[0085] Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR Indicates the second ambient temperature correction coefficient, K PR Indicates the second ambient temperature correction coefficient, K HR Indicates the second environmental pollution correction coefficient, K UR Represents the second voltage fluctuation correction coefficient, G R It represents the growth ratio of resistive current, and S1, S2 and S3 represent weight coefficients.

[0086] For example, the correlation relationship satisfies:

[0087]

[0088] Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

[0089] The full current growth ratio meets the following requirements:

[0090]

[0091] Among them, G X Indicates the total current growth ratio, I Xt Represents the total current of the power electronic switch at time t, I Xt-1 Represents the total current of the power electronic switch at time t-1.

[0092] The resistive current growth ratio satisfies:

[0093]

[0094] Among them, G R Indicates the resistive current growth ratio, I Rt Represents the resistive current of the power electronic switch at time t, I Rt-1 Represents the resistive current of the power electronic switch at time t-1.

[0095] On the other hand, the present application also provides a computer device, including: one or more processors.

[0096] A processor is used to execute one or more programs.

[0097] When one or more programs are executed by one or more processors, the above-described determination method is implemented.

[0098] In another aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the above-mentioned determination method.

[0099] Compared with the prior art, the present invention has the following advantages:

[0100] In the method for determining the state of a power electronic switch for a temporary overvoltage suppression device provided by the present application, the full current growth ratio is calculated based on the full current of the power electronic switch. The first voltage fluctuation correction coefficient is calculated based on the actual voltage of the power electronic switch, and the full current growth ratio is corrected based on the first voltage fluctuation correction coefficient. The state of the power electronic switch is determined based on the corrected full current growth ratio. It can be seen that the present application realizes online determination of the state of the power electronic switch through the full current and actual voltage of the power electronic switch. It overcomes the limitations of the related art of realizing power electronic switch state determination based on collecting the voltage at both ends of the switch unit in the power electronic switch, does not require a complex secondary power supply circuit, not only simplifies the structure of the temporary overvoltage suppression device, but also avoids the impact on the potential distribution of the temporary overvoltage suppression device, thereby ensuring the normal operation of the temporary overvoltage suppression device.

[0101] This application not only takes into account the ambient temperature, ambient humidity and ambient pollution of the power electronic switch, but also corrects the total current growth ratio and the resistive current growth ratio, which can prevent the changes in the power electronic leakage current caused by environmental conditions from interfering with the state judgment, effectively reducing the probability of misjudgment and ensuring the accuracy of the power electronic switch state judgment.

[0102] This application can reflect the status of the power electronic switch in real time, and can determine the number of short-circuit layers of the switch units in the power electronic switch in a faulty state in real time after a fault occurs, further providing a reliable basis for the operation and maintenance of the power electronic switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0103] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0104] Figure 1 This is a schematic structural diagram of a temporary overvoltage suppression device in an embodiment of the present application;

[0105] Figure 2 This is a schematic flow chart of a method for determining the state of a power electronic switch in an embodiment of the present application;

[0106] Figure 3 Schematic diagram of the total current, resistive current, total current growth ratio, and resistive current growth ratio of the power electronic switch in an embodiment of the present application;

[0107] Figure 4 This is a schematic structural diagram of a power electronic switch state determination device in an embodiment of the present application. DETAILED DESCRIPTION

[0108] The technical solution in this application will be described below with reference to the accompanying drawings.

[0109] The terms "first," "second," and the like in the description, embodiments, claims, and drawings of this application are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance or order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, inclusion of a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0110] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0111] Example 1:

[0112] The embodiment of the present application provides a method for determining the state of a power electronic switch used in a temporary overvoltage suppression device. Figure 1 As shown, the temporary overvoltage suppression device 100 may include a controllable switch 1, a first suppression component 2, and a second suppression component 3. The controllable switch 1 and the second suppression component 3 are connected in parallel to form a controllable branch. The controllable branch is connected in series with the first suppression component 2.

[0113] The first suppression component 2 includes multiple nonlinear resistors R1 connected in series. The second suppression component 3 includes multiple nonlinear resistors R2 connected in series. The controllable switch 1 may include multiple controllable units. Each control unit may include a nonlinear resistor R3 and anti-parallel thyristors T1 and T2.

[0114] like Figure 2 As shown, the determination method 200 may include the following steps:

[0115] Step S1: calculating the total current growth ratio according to the total current of the power electronic switch.

[0116] Step S2: Calculate a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch, and correct the total current growth ratio according to the first voltage fluctuation correction coefficient.

[0117] Step S3: determining the state of the power electronic switch according to the corrected total current growth ratio.

[0118] In some embodiments, calculating the first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch in step S2 includes:

[0119] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch. The actual voltage change is fitted with the total current growth ratio to obtain a first voltage fluctuation proportional coefficient. A first voltage fluctuation correction coefficient is calculated based on the voltage fluctuation proportional coefficient of the total current growth ratio.

[0120] Exemplarily, the first voltage fluctuation correction coefficient satisfies:

[0121]

[0122] Among them, K UX Indicates the first voltage fluctuation correction coefficient, U t represents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX Indicates the first voltage fluctuation proportional coefficient.

[0123] In some other embodiments, the step S2 of correcting the total current growth ratio according to the first voltage fluctuation correction coefficient includes:

[0124] The ambient temperature, ambient humidity, and ambient pollution level of the power electronic switch are collected. A first ambient temperature correction factor, a first ambient humidity correction factor, and a first ambient pollution level correction factor are determined based on the ambient temperature, ambient humidity, and ambient pollution level. The total current growth ratio is corrected based on the first voltage fluctuation correction factor, the first ambient temperature correction factor, the first ambient humidity correction factor, and the first ambient pollution level correction factor to obtain a corrected total current growth ratio.

[0125] Furthermore, determining a first ambient temperature correction coefficient, a first ambient humidity correction coefficient, and a first ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree includes:

[0126] The ambient temperature and the total current growth ratio are fitted to obtain a first ambient temperature correction coefficient. The ambient humidity and the total current growth ratio are fitted to obtain a first ambient humidity correction coefficient. The ambient pollution degree correction coefficient and the total current growth ratio are fitted to obtain a first ambient pollution degree correction coefficient.

[0127] Optionally, the corrected full current growth ratio satisfies:

[0128]

[0129] Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX Indicates the first ambient temperature correction coefficient, K PX Indicates the first ambient temperature correction coefficient, K HXIndicates the first environmental pollution correction coefficient, K UX Indicates the first voltage fluctuation correction coefficient, G X Indicates the total current growth ratio, S1, S2 and S3 are weight coefficients.

[0130] In another embodiment, determining the state of the power electronic switch according to the corrected total current growth ratio in step S3 includes:

[0131] If the corrected total current growth ratio is greater than or equal to a preset first growth ratio threshold, it is determined that the power electronic switch is in a fault state.

[0132] If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

[0133] Furthermore, the determination method provided in the embodiment of the present application also includes:

[0134] The resistive current of the power electronic switch is collected, and a resistive current growth ratio is calculated based on the resistive current. The resistive current growth ratio is corrected to obtain a corrected resistive current growth ratio. The number of switch units in the power electronic switch in the faulty state is determined based on the corrected resistive current growth ratio and a correlation between the corrected resistive current growth ratio and the number of switch units in the power electronic switch in the faulty state.

[0135] In the embodiment of the present application, when the temporary overvoltage suppression device causes damage to the thyristor due to an excessively high current conversion rate, most faults are manifested as short-circuit breakdown faults of the thyristor. During fault simulation, different controllable units in the power electronic switch can be short-circuited directly. The full current and resistive current of the power electronic switch are collected, and then the power electronic switch is subjected to fault simulation to obtain the full current, resistive current, full current growth ratio and resistive current growth ratio of the power electronic switch under different fault layers (i.e., the number of switch units in the fault state). For example, Figure 3 shown.

[0136] Optionally, the resistive current growth ratio is corrected to obtain a corrected resistive current growth ratio, including:

[0137] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch. The actual voltage change is fitted with the resistive current growth ratio to obtain a second voltage fluctuation proportional coefficient. The ambient temperature, ambient humidity, and ambient pollution level of the power electronic switch are collected, and a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution level correction coefficient are determined based on the ambient temperature, ambient humidity, and ambient pollution level. The resistive current growth ratio is corrected based on the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution level correction coefficient to obtain a corrected resistive current growth ratio.

[0138] Furthermore, determining a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree includes:

[0139] The ambient temperature and the resistive current growth ratio are fitted to obtain a second ambient temperature correction coefficient. The ambient humidity and the resistive current growth ratio are fitted to obtain a second ambient humidity correction coefficient. The ambient pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain a second ambient pollution degree correction coefficient.

[0140] For example, the corrected resistive current growth ratio satisfies:

[0141]

[0142] Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR Indicates the second ambient temperature correction coefficient, K PR Indicates the second ambient temperature correction coefficient, K HR Indicates the second environmental pollution correction coefficient, K UR Represents the second voltage fluctuation correction coefficient, G R It represents the growth ratio of resistive current, and S1, S2 and S3 represent weight coefficients.

[0143] The relevant relationship meets:

[0144]

[0145] Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

[0146] The full current growth ratio meets the following requirements:

[0147]

[0148] Among them, G X Indicates the total current growth ratio, I Xt Represents the total current of the power electronic switch at time t, I Xt-1 Represents the total current of the power electronic switch at time t-1.

[0149] The resistive current growth ratio satisfies:

[0150]

[0151] Among them, G R Indicates the resistive current growth ratio, I Rt Represents the resistive current of the power electronic switch at time t, I Rt-1 Represents the resistive current of the power electronic switch at time t-1.

[0152] Example 2:

[0153] Based on the same inventive concept, the embodiment of the present application also provides a power electronic switch state determination device for a temporary overvoltage suppression device. Figure 4 As shown, the determination device 300 includes:

[0154] The calculation module 301 is configured to calculate a total current growth ratio according to the total current of the power electronic switch.

[0155] The correction module 302 is configured to calculate a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch, and correct the total current growth ratio according to the first voltage fluctuation correction coefficient.

[0156] The determination module 303 is configured to determine the state of the power electronic switch according to the corrected total current growth ratio.

[0157] In a possible implementation, the calculation module 301 is specifically configured to:

[0158] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch. The actual voltage change is fitted with the total current growth ratio to obtain a first voltage fluctuation proportional coefficient. A first voltage fluctuation correction coefficient is calculated based on the voltage fluctuation proportional coefficient of the total current growth ratio.

[0159] Optionally, the first voltage fluctuation correction coefficient satisfies:

[0160]

[0161] Among them, K UX Indicates the first voltage fluctuation correction coefficient, U trepresents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX Indicates the first voltage fluctuation proportional coefficient.

[0162] In another possible implementation, the correction module 302 is specifically configured to:

[0163] The ambient temperature, ambient humidity, and ambient pollution level of the power electronic switch are collected. A first ambient temperature correction factor, a first ambient humidity correction factor, and a first ambient pollution level correction factor are determined based on the ambient temperature, ambient humidity, and ambient pollution level. The total current growth ratio is corrected based on the first voltage fluctuation correction factor, the first ambient temperature correction factor, the first ambient humidity correction factor, and the first ambient pollution level correction factor to obtain a corrected total current growth ratio.

[0164] Furthermore, the correction module 302 is specifically configured to:

[0165] The ambient temperature and the total current growth ratio are fitted to obtain a first ambient temperature correction coefficient. The ambient humidity and the total current growth ratio are fitted to obtain a first ambient humidity correction coefficient. The ambient pollution degree correction coefficient and the total current growth ratio are fitted to obtain a first ambient pollution degree correction coefficient.

[0166] Optionally, the corrected full current growth ratio satisfies:

[0167]

[0168] Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX Indicates the first ambient temperature correction coefficient, K PX Indicates the first ambient temperature correction coefficient, K HX Indicates the first environmental pollution correction coefficient, K UX Indicates the first voltage fluctuation correction coefficient, G X Indicates the total current growth ratio, S1, S2 and S3 are weight coefficients.

[0169] In another possible implementation, the determination module 303 is specifically configured to:

[0170] If the corrected total current growth ratio is greater than or equal to a preset first growth ratio threshold, it is determined that the power electronic switch is in a fault state.

[0171] If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

[0172] Furthermore, the calculation module 301 is further configured to: collect the resistive current of the power electronic switch, and calculate the resistive current growth ratio according to the resistive current.

[0173] The correction module 302 is further configured to correct the resistive current growth ratio to obtain a corrected resistive current growth ratio.

[0174] The determination module 303 is further configured to determine the number of switch units in a faulty state according to the corrected resistive current growth ratio and in combination with the correlation between the corrected resistive current growth ratio and the number of switch units in a faulty state in the power electronic switch.

[0175] Optionally, the calculation module 301 is specifically configured to:

[0176] The actual voltage of the power electronic switch is collected, and the actual voltage change is calculated based on the actual voltage of the power electronic switch. The actual voltage change is fitted with the resistive current growth ratio to obtain a second voltage fluctuation proportional coefficient. The ambient temperature, ambient humidity, and ambient pollution level of the power electronic switch are collected, and a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution level correction coefficient are determined based on the ambient temperature, ambient humidity, and ambient pollution level. The resistive current growth ratio is corrected based on the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution level correction coefficient to obtain a corrected resistive current growth ratio.

[0177] Furthermore, the calculation module 301 is specifically configured to:

[0178] The ambient temperature and the resistive current growth ratio are fitted to obtain a second ambient temperature correction coefficient. The ambient humidity and the resistive current growth ratio are fitted to obtain a second ambient humidity correction coefficient. The ambient pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain a second ambient pollution degree correction coefficient.

[0179] For example, the corrected resistive current growth ratio satisfies:

[0180]

[0181] Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR Indicates the second ambient temperature correction coefficient, K PR Indicates the second ambient temperature correction coefficient, K HR Indicates the second environmental pollution correction coefficient, K UR Represents the second voltage fluctuation correction coefficient, G R It represents the growth ratio of resistive current, and S1, S2 and S3 represent weight coefficients.

[0182] For example, the correlation relationship satisfies:

[0183]

[0184] Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

[0185] The full current growth ratio meets the following requirements:

[0186]

[0187] Among them, G X Indicates the total current growth ratio, I Xt Represents the total current of the power electronic switch at time t, I Xt-1 Represents the total current of the power electronic switch at time t-1.

[0188] The resistive current growth ratio satisfies:

[0189]

[0190] Among them, G R Indicates the resistive current growth ratio, I Rt Represents the resistive current of the power electronic switch at time t, I Rt-1 Represents the resistive current of the power electronic switch at time t-1.

[0191] Example 3:

[0192] Based on the same inventive concept, an embodiment of the present application further provides a computer device, comprising a processor and a memory, the memory being used to store a computer program, the computer program comprising program instructions, and the processor being used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, and are suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a computer storage medium to implement a corresponding method flow or corresponding function, so as to implement the steps of the determination method provided in the above embodiment.

[0193] Example 4:

[0194] Based on the same inventive concept, an embodiment of the present application also provides a computer-readable storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and, of course, an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the determination method provided in the above embodiment.

[0195] Those skilled in the art will appreciate that embodiments of the application may be provided as methods, systems, or computer program products. Thus, the application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0196] The application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a 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.

[0197] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0198] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0199] The above are merely embodiments of the application and are not intended to limit the application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the application are included in the scope of the claims of the pending application.

Claims

1. A method for determining the state of a power electronic switch for a temporary overvoltage suppression device, characterized in that: include: Calculate the total current growth ratio based on the total current of the power electronic switch; Calculating a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch, and correcting the total current growth ratio according to the first voltage fluctuation correction coefficient; The state of the power electronic switch is determined according to the corrected total current growth ratio.

2. The determination method according to claim 1, wherein: Calculating a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch includes: collecting the actual voltage of the power electronic switch, and calculating the actual voltage change according to the actual voltage of the power electronic switch; Fitting the actual voltage change and the total current growth ratio to obtain the first voltage fluctuation proportional coefficient; The first voltage fluctuation correction coefficient is calculated according to the voltage fluctuation proportional coefficient of the full current increase ratio.

3. The determination method according to claim 2, wherein: The first voltage fluctuation correction coefficient satisfies: Among them, K UX represents the first voltage fluctuation correction coefficient, U t represents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX represents the first voltage fluctuation proportional coefficient.

4. The determination method according to claim 1, wherein: The correcting the total current growth ratio according to the first voltage fluctuation correction coefficient includes: collecting the ambient temperature, ambient humidity and ambient pollution degree of the power electronic switch; Determining a first ambient temperature correction coefficient, a first ambient humidity correction coefficient, and a first ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree; The total current growth ratio is corrected according to the first voltage fluctuation correction coefficient, the first ambient temperature correction coefficient, the first ambient humidity correction coefficient, and the first ambient pollution degree correction coefficient to obtain the corrected total current growth ratio.

5. The determination method according to claim 4, characterized in that: The determining of the first ambient temperature correction coefficient, the first ambient humidity correction coefficient, and the first ambient pollution degree correction coefficient according to the ambient temperature, the ambient humidity, and the ambient pollution degree includes: Fitting the ambient temperature and the total current growth ratio to obtain the first ambient temperature correction coefficient; Fitting the ambient humidity and the total current growth ratio to obtain the first ambient humidity correction coefficient; The environmental pollution degree correction coefficient and the total current growth ratio are fitted to obtain the first environmental pollution degree correction coefficient.

6. The determination method according to claim 4, characterized in that: The corrected full current growth ratio satisfies: Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX represents the first ambient temperature correction coefficient, K PX represents the first ambient temperature correction coefficient, K HX The first environmental pollution degree correction coefficient, K UX represents the first voltage fluctuation correction coefficient, G X represents the total current growth ratio, and S1, S2 and S3 represent weight coefficients.

7. The determination method according to claim 1, wherein: The determining the state of the power electronic switch according to the corrected total current growth ratio includes: If the corrected total current growth rate is greater than or equal to a preset first growth rate threshold, it is determined that the power electronic switch is in a fault state; If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

8. The determination method according to claim 1, wherein: The determination method further includes: collecting a resistive current of the power electronic switch, and calculating a resistive current growth ratio based on the resistive current; Correcting the resistive current growth ratio to obtain a corrected resistive current growth ratio; The number of switch units in the fault state is determined according to the corrected resistive current growth ratio and in combination with a correlation between the corrected resistive current growth ratio and the number of switch units in the fault state in the power electronic switch.

9. The determination method according to claim 8, characterized in that: The step of correcting the resistive current growth ratio to obtain a corrected resistive current growth ratio includes: collecting an actual voltage of the power electronic switch, and calculating an actual voltage change according to the actual voltage of the power electronic switch; Fitting the actual voltage change and the resistive current growth ratio to obtain a second voltage fluctuation proportional coefficient; collecting the ambient temperature, ambient humidity, and ambient pollution degree of the power electronic switch, and determining a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree; The resistive current growth ratio is corrected according to the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution degree correction coefficient to obtain the corrected resistive current growth ratio.

10. The determination method according to claim 9, characterized in that: The determining of the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree includes: Fitting the ambient temperature and the resistive current growth ratio to obtain the second ambient temperature correction coefficient; Fitting the ambient humidity and the resistive current growth ratio to obtain the second ambient humidity correction coefficient; The environmental pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain the second environmental pollution degree correction coefficient.

11. The determination method according to claim 8, characterized in that: The corrected resistive current growth ratio satisfies: Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR represents the second ambient temperature correction coefficient, K PR represents the second ambient temperature correction coefficient, K HR The second environmental pollution degree correction coefficient, K UR represents the second voltage fluctuation correction coefficient, G R represents the growth ratio of the resistive current, and S1, S2 and S3 represent weight coefficients.

12. The determination method according to claim 8, wherein: The correlation relationship satisfies: Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

13. The determination method according to claim 8, characterized in that: The total current growth ratio satisfies: Among them, G X Indicates the total current growth ratio, I Xt represents the total current of the power electronic switch at time t, I Xt-1 represents the full current of the power electronic switch at time t-1; The resistive current growth ratio satisfies: Among them, G R Indicates the resistive current growth ratio, I Rt represents the resistive current of the power electronic switch at time t, I Rt-1 represents the resistive current of the power electronic switch at time t-1.

14. A power electronic switch state determination device for a temporary overvoltage suppression device, characterized in that: include: a calculation module, used for calculating a full current growth ratio according to a full current of the power electronic switch; a correction module, configured to calculate a first voltage fluctuation correction coefficient according to the actual voltage of the power electronic switch, and correct the total current growth ratio according to the first voltage fluctuation correction coefficient; A determination module is used to determine the state of the power electronic switch according to the corrected full current growth ratio.

15. The determination device according to claim 14, characterized in that: The calculation module is specifically used for: collecting the actual voltage of the power electronic switch, and calculating the actual voltage change according to the actual voltage of the power electronic switch; Fitting the actual voltage change and the total current growth ratio to obtain the first voltage fluctuation proportional coefficient; The first voltage fluctuation correction coefficient is calculated according to the voltage fluctuation proportional coefficient of the full current increase ratio.

16. The determination device according to claim 15, characterized in that: The first voltage fluctuation correction coefficient satisfies: Among them, K UX represents the first voltage fluctuation correction coefficient, U t represents the actual voltage of the power electronic switch at time t, U t-1 represents the actual voltage of the power electronic switch at time t-1, e UX represents the first voltage fluctuation proportional coefficient.

17. The determination device according to claim 14, wherein: The correction module is specifically used for: collecting the ambient temperature, ambient humidity and ambient pollution degree of the power electronic switch; Determining a first ambient temperature correction coefficient, a first ambient humidity correction coefficient, and a first ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree; The total current growth ratio is corrected according to the first voltage fluctuation correction coefficient, the first ambient temperature correction coefficient, the first ambient humidity correction coefficient, and the first ambient pollution degree correction coefficient to obtain the corrected total current growth ratio.

18. The determination device according to claim 17, wherein: The correction module is specifically used for: Fitting the ambient temperature and the total current growth ratio to obtain the first ambient temperature correction coefficient; Fitting the ambient humidity and the total current growth ratio to obtain the first ambient humidity correction coefficient; The environmental pollution degree correction coefficient and the total current growth ratio are fitted to obtain the first environmental pollution degree correction coefficient.

19. The determination device according to claim 17, wherein: The corrected full current growth ratio satisfies: Among them, G Xcorrect Indicates the corrected full current growth ratio, K TX represents the first ambient temperature correction coefficient, K PX represents the first ambient temperature correction coefficient, K HX The first environmental pollution degree correction coefficient, K UX represents the first voltage fluctuation correction coefficient, G X represents the total current growth ratio, and S1, S2 and S3 represent weight coefficients.

20. The determination device according to claim 14, wherein: The determination module is specifically used for: If the corrected total current growth rate is greater than or equal to a preset first growth rate threshold, it is determined that the power electronic switch is in a fault state; If the corrected total current growth ratio is less than the first growth ratio threshold, it is determined that the power electronic switch is in a normal state.

21. The determination device according to claim 14, wherein: The calculation module is further used to: collect the resistive current of the power electronic switch, and calculate the resistive current growth ratio according to the resistive current; The correction module is further configured to: correct the resistive current growth ratio to obtain a corrected resistive current growth ratio; The determination module is further used to determine the number of switch units in a faulty state based on the corrected resistive current growth ratio and in combination with the correlation between the corrected resistive current growth ratio and the number of switch units in a faulty state in the power electronic switch.

22. The determination device according to claim 21, wherein: The calculation module is specifically used for: collecting an actual voltage of the power electronic switch, and calculating an actual voltage change according to the actual voltage of the power electronic switch; Fitting the actual voltage change and the resistive current growth ratio to obtain a second voltage fluctuation proportional coefficient; collecting the ambient temperature, ambient humidity, and ambient pollution degree of the power electronic switch, and determining a second ambient temperature correction coefficient, a second ambient humidity correction coefficient, and a second ambient pollution degree correction coefficient according to the ambient temperature, ambient humidity, and ambient pollution degree; The resistive current growth ratio is corrected according to the second voltage fluctuation correction coefficient, the second ambient temperature correction coefficient, the second ambient humidity correction coefficient, and the second ambient pollution degree correction coefficient to obtain the corrected resistive current growth ratio.

23. The determination device according to claim 22, wherein: The calculation module is specifically used for: Fitting the ambient temperature and the resistive current growth ratio to obtain the second ambient temperature correction coefficient; Fitting the ambient humidity and the resistive current growth ratio to obtain the second ambient humidity correction coefficient; The environmental pollution degree correction coefficient and the resistive current growth ratio are fitted to obtain the second environmental pollution degree correction coefficient.

24. The determination device according to claim 21, wherein: The corrected resistive current growth ratio satisfies: Among them, G rcorrect Indicates the corrected resistive current growth ratio, K TR represents the second ambient temperature correction coefficient, K PR represents the second ambient temperature correction coefficient, K HR The second environmental pollution degree correction coefficient, K UR represents the second voltage fluctuation correction coefficient, G R represents the growth ratio of the resistive current, and S1, S2 and S3 represent weight coefficients.

25. The determination device according to claim 21, wherein: The correlation relationship satisfies: Among them, G rcorrect represents the corrected resistive current growth ratio, n represents the number of switch units in the fault state, a r 、b r and c r represents the fitting coefficient.

26. The determination device according to claim 21, wherein: The total current growth ratio satisfies: Among them, G X Indicates the total current growth ratio, I Xt represents the total current of the power electronic switch at time t, I Xt-1 represents the full current of the power electronic switch at time t-1; The resistive current growth ratio satisfies: Among them, G R Indicates the resistive current growth ratio, I Rt represents the resistive current of the power electronic switch at time t, I Rt-1 represents the resistive current of the power electronic switch at time t-1.

27. A computer device, characterized in that: include: one or more processors; The processor is configured to store one or more programs; When the one or more programs are executed by the one or more processors, the determination method according to any one of claims 1 to 13 is implemented.

28. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed, the determination method according to any one of claims 1 to 13 is implemented.

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