Inverter system detection method, inverter system and arc detection system

Abstract

The present application discloses a detection method for an inverter system, an inverter system and an arc detection system, and belongs to the field of inverter systems. The detection method for the inverter system includes: obtaining the first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system or an inductance electrical signal of the inverter system; based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal and the minimum amplitude corresponding to the sampling signal, determining the saturation state of the sampling signal; the saturation state includes: saturation or unsaturation; based on the saturation state, performing arc detection. The detection method for the inverter system of the present application effectively determines the saturation state of the sampling signal. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

Description

Technical Field

[0001] The present application belongs to the field of inverter systems, and in particular relates to a detection method for an inverter system, an inverter system, and an arc detection system. Background Art

[0002] The inverter system samples the current through the arc detection system and analyzes the sampled signal through software to determine whether there is an arc on the DC side. In related technologies, the sampled signal is affected by the sampling limit, and the original signal is limited within the limit value. When the sampled signal exceeds the limit value, the sampled signal will be judged as saturated. The sampled signal is affected by the current operating conditions of the inverter system and may reach saturation even when there is no arc, thus causing the sampled signal to be distorted, affecting the accuracy and integrity of the sampling analysis. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a detection method of an inverter system, an inverter system and an arc detection system, which effectively judge the saturation state of a sampling signal, and if the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

[0004] In a first aspect, the present application provides a detection method for an inverter system, wherein the inverter system is connected to an arc detection system; the method comprises:

[0005] Acquire a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system or an inductance electrical signal of the inverter system;

[0006] Determine the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal; the saturation state includes: saturation or unsaturation;

[0007] Based on the saturation state, arc detection is performed.

[0008] According to the detection method of the inverter system of the present application, the inverter system is sampled to obtain a sampling signal, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

[0009] According to the detection method of the inverter system of the present application, the determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal includes:

[0010] Obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude;

[0011] Based on the maximum amplitude, the minimum amplitude and the sensitivity information, a target threshold is obtained; the sensitivity information is determined based on the correlation between the target saturation level and the accuracy of the arc detection result of the inverter system;

[0012] The saturation state of the sampled signal is determined based on at least two of the target saturation level, the first actual value, and the target threshold value.

[0013] According to the detection method of the inverter system of the present application, obtaining the target threshold based on the maximum amplitude, the minimum amplitude and the sensitivity information includes:

[0014] Determine a first threshold based on the sensitivity information, the maximum amplitude and the minimum amplitude; the first threshold is not greater than a first ratio determined based on the maximum amplitude and a first difference; the first difference is determined based on the maximum amplitude and the minimum amplitude;

[0015] Determine a second threshold based on the target value, the sensitivity information, the maximum amplitude and the minimum amplitude; the second threshold is not less than a second ratio determined based on the minimum amplitude and the first difference, and the second threshold is less than the first threshold;

[0016] The target threshold is determined based on the first threshold and the second threshold.

[0017] According to the detection method of the inverter system of the present application, obtaining the target saturation degree of the sampling signal based on at least one of the first actual value, the maximum amplitude and the minimum amplitude includes:

[0018] The target saturation level is obtained based on the first actual value, the maximum amplitude and the minimum amplitude.

[0019] According to the detection method of the inverter system of the present application, determining the saturation state of the sampling signal based on at least two of the target saturation degree, the first actual value, and the target threshold value includes:

[0020] When the target saturation level is not less than the first threshold or the target saturation level is not greater than the second threshold, determining that the sampling signal is saturated;

[0021] When the target saturation level is greater than the second threshold and the target saturation level is less than the first threshold, it is determined that the sampling signal is not saturated.

[0022] According to the detection method of the inverter system of the present application, determining the saturation state of the sampling signal based on at least two of the target saturation degree, the first actual value, and the target threshold value includes:

[0023] When the first actual value is not less than the first threshold or the first actual value is not greater than the second threshold, determining that the sampling signal is saturated;

[0024] In a case where the first actual value is greater than the second threshold and the first actual value is less than the first threshold, it is determined that the sampling signal is not saturated.

[0025] According to the detection method of the inverter system of the present application, obtaining the target saturation degree of the sampling signal based on at least one of the first actual value, the maximum amplitude and the minimum amplitude includes:

[0026] Obtaining the maximum value and the minimum value of the first actual value of each of the sampling signals within a target period;

[0027] The target saturation level is obtained based on the maximum value and the minimum value.

[0028] According to the detection method of the inverter system of the present application, determining the saturation state of the sampling signal based on the target saturation degree and the target threshold value includes:

[0029] When the target saturation level is not less than the target threshold, determining that the sampling signal is saturated;

[0030] When the target saturation level is less than the target threshold, it is determined that the sampling signal is not saturated.

[0031] According to the detection method of the inverter system of the present application, obtaining the target saturation degree of the sampling signal based on at least one of the first actual value, the maximum amplitude and the minimum amplitude includes:

[0032] Based on the first actual value and the maximum amplitude, obtaining a first sub-goal saturation degree;

[0033] Based on the first actual value and the minimum amplitude, obtaining a second sub-target saturation degree;

[0034] The target saturation degree is obtained based on the first sub-target saturation degree and the second sub-target saturation degree.

[0035] According to the detection method of the inverter system of the present application, determining the saturation state of the sampling signal based on the target saturation degree and the target threshold value includes:

[0036] In the case where the saturation degree of the first sub-target is not greater than the target threshold or the saturation degree of the second sub-target is not greater than the target threshold, determining that the sampling signal is saturated;

[0037] In the case where the first sub-target saturation level is greater than the target threshold and the second sub-target saturation level is greater than the target threshold, it is determined that the sampling signal is not saturated.

[0038] According to the detection method of the inverter system of the present application, when the sampling signal is an inductor electrical signal, determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal includes:

[0039] The saturation state of the inductor electrical signal is determined based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system.

[0040] According to the detection method of the inverter system of the present application, the determining the saturation state of the inductor electrical signal based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system includes:

[0041] Obtaining a target current ripple based on at least one of the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system;

[0042] Based on the inductor electrical signal and the inductor current sensitivity information, a target ripple threshold is obtained; the inductor current sensitivity information is determined based on a ratio of a maximum value corresponding to a current ripple range of the inductor electrical signal to the first actual value of the inductor electrical signal;

[0043] The saturation state of the inductor electrical signal is determined based on the target current ripple and the target ripple threshold.

[0044] According to the detection method of the inverter system of the present application, the target current ripple is obtained based on at least one of the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, including:

[0045] Acquire a maximum inductor current value and a minimum inductor current value in the first actual values ​​of the inductor electrical signals within a target period;

[0046] A target current ripple is obtained based on the maximum inductor current value and the minimum inductor current value.

[0047] According to the detection method of the inverter system of the present application, the target current ripple is obtained based on at least one of the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, including:

[0048] The target current ripple is obtained based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system.

[0049] According to the detection method of the inverter system of the present application, determining the saturation state of the inductor electrical signal based on the target current ripple and the target ripple threshold includes:

[0050] When the target current ripple is not less than the target ripple threshold, determining that the inductor electrical signal is saturated;

[0051] When the target current ripple is less than the target ripple threshold, it is determined that the inductor electrical signal is not saturated.

[0052] According to the detection method of the inverter system of the present application, the determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal includes:

[0053] Performing data transformation on the first actual value to obtain target transformed data;

[0054] Performing algorithm analysis on the target transformation data to obtain an algorithm analysis result;

[0055] Based on the algorithm analysis result, the saturation state of the sampling signal is determined.

[0056] According to the detection method of the inverter system of the present application, the algorithm analysis of the target conversion data is performed to obtain the algorithm analysis result, including:

[0057] Grouping the target transformation data to obtain at least one target data group;

[0058] Calculating statistical information corresponding to each of the target data groups;

[0059] Based on the statistical information, determining weight information of each of the target data groups;

[0060] Based on the weight information and each of the target data groups, an algorithm analysis is performed to obtain the algorithm analysis result.

[0061] According to the detection method of the inverter system of the present application, the determining the saturation state of the sampling signal based on the algorithm analysis result includes:

[0062] Determining frequency spectrum characteristics based on the algorithm analysis results;

[0063] The saturation state of the sampled signal is determined based on the frequency spectrum feature.

[0064] According to the detection method of the inverter system of the present application, the determining the saturation state of the sampling signal based on the frequency spectrum feature includes:

[0065] Based on the frequency spectrum characteristics, determining an arc state; the arc state includes: an arc is generated or an arc is not generated;

[0066] Based on the arc state, the saturation state of the sampling signal is determined.

[0067] According to the detection method of the inverter system of the present application, the arc detection is performed based on the saturation state, including:

[0068] When the saturation state is saturated, desaturation processing is performed on the sampling signal to obtain an unsaturated sampling signal;

[0069] Arc detection is performed based on the unsaturated sampling signal.

[0070] According to the detection method of the inverter system of the present application, the desaturation processing is performed on the sampling signal to obtain an unsaturated sampling signal, including:

[0071] By adjusting at least one of the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system and the switching frequency of the switch tube in the inverter system, the sampling signal is desaturated to obtain the unsaturated sampling signal.

[0072] According to the detection method of the inverter system of the present application, the bus voltage of the inverter system is adjusted to perform desaturation processing on the sampling signal to obtain the unsaturated sampling signal, including:

[0073] Adjust at least one of the bus voltage corresponding to the inverter system, the bus voltage corresponding to the battery pack electrically connected to the inverter, and the bus voltage corresponding to the charging pile electrically connected to the inverter, desaturate the sampling signal, and obtain the unsaturated sampling signal.

[0074] In a second aspect, the present application provides a detection device for an inverter system, wherein the inverter system is connected to an arc detection system; the device comprises:

[0075] A first processing module, used for acquiring a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system or an inductance electrical signal of the inverter system;

[0076] A second processing module, configured to determine a saturation state of the sampling signal based on at least one of the first actual value, a maximum amplitude corresponding to the sampling signal, and a minimum amplitude corresponding to the sampling signal; the saturation state includes: saturation or unsaturation;

[0077] The third processing module is used to perform arc detection based on the saturation state.

[0078] According to the detection device of the inverter system of the present application, the inverter system is sampled to obtain a sampling signal, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

[0079] In a third aspect, the present application provides an inverter system, which performs detection based on the detection method for the inverter system as described in the first aspect.

[0080] In a fourth aspect, the present application provides an arc detection system based on the detection method of the inverter system as described in the first aspect, comprising:

[0081] Sampling module;

[0082] The signal processing module is electrically connected to the signal processing module.

[0083] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the detection method of the inverter system as described in the first aspect above is implemented.

[0084] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the detection method of the inverter system as described in the first aspect above.

[0085] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0086] By sampling the inverter system, a sampling signal is obtained, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection, and ensure the integrity of arc detection.

[0087] Furthermore, the target saturation degree and target threshold value of the sampling signal are determined respectively by using the first actual value, the maximum amplitude, the minimum amplitude and one or more of the sensitive information of the sampling signal. Thus, based on the target saturation degree and the correlation between the first actual value and the target threshold value, the saturation state of the sampling signal is effectively determined. The judgment method is simple, convenient and highly operational.

[0088] Furthermore, the current ripple of the inductor electrical signal is calculated by collecting the inductor electrical signal, the input voltage of the inverter system and the switching frequency of the switch tube in the inverter system, so that the saturation degree of the sampling signal is judged based on the current ripple of the inductor electrical signal, and the saturation state of the sampling signal is effectively determined. The judgment method is simple and convenient.

[0089] Furthermore, by adjusting the bus voltage corresponding to the photovoltaic inverter in the inverter system, the bus voltage corresponding to the battery pack used in conjunction with the photovoltaic inverter, and the bus voltage corresponding to the charging pile, the bus voltage of the inverter system can be effectively adjusted, and the available adjustment methods can be flexibly selected to desaturate the saturated sampling signal to obtain an unsaturated sampling signal. This can address the problem that the sampling signal may be distorted under saturation conditions, affecting the accuracy of the sampling signal analysis, and improve the accuracy of arc detection.

[0090] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0092] Figure 1 This is one of the flow charts of the detection method of the inverter system provided in the embodiment of the present application;

[0093] Figure 2 This is a second flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0094] Figure 3 This is a third flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0095] Figure 4 This is a fourth flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0096] Figure 5 This is a fifth flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0097] Figure 6 is a structural schematic diagram of a detection device for an inverter system provided in an embodiment of the present application;

[0098] Figure 7 It is one of the structural schematic diagrams of the inverter system provided in the embodiment of the present application;

[0099] Figure 8 This is the second structural schematic diagram of the inverter system provided in the embodiment of the present application;

[0100] Fig. 9 This is the third structural schematic diagram of the inverter system provided in the embodiment of the present application;

[0101] Fig.10 This is the fourth structural diagram of the inverter system provided in the embodiment of the present application;

[0102] Fig.11 This is the fifth structural diagram of the inverter system provided in the embodiment of the present application;

[0103] Fig.12 This is the sixth structural diagram of the inverter system provided in the embodiment of the present application;

[0104] Fig.13 This is the seventh structural diagram of the inverter system provided in the embodiment of the present application;

[0105] Fig.14 This is the eighth structural diagram of the inverter system provided in the embodiment of the present application;

[0106] Fig.15 It is one of the structural schematic diagrams of the arc detection system provided in the embodiment of the present application;

[0107] Fig.16 This is the second structural schematic diagram of the arc detection system provided in the embodiment of the present application;

[0108] Fig.17This is the third structural diagram of the arc detection system provided in the embodiment of the present application;

[0109] Fig.18 This is the fourth structural diagram of the arc detection system provided in the embodiment of the present application;

[0110] Fig.19 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0111] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0112] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0113] In the following, in combination with the accompanying drawings, the detection method of the inverter system, the detection device of the inverter system, the inverter system and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0114] The detection method of the inverter system may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0115] The terminal includes but is not limited to portable communication devices such as mobile phones or tablet computers. It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer.

[0116] In the following various embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse and a joystick.

[0117] The detection method for an inverter system provided in the embodiment of the present application may be executed by the inverter system, or an electronic device connected to the inverter system for communication, or a functional module or functional entity in the electronic device that can implement the detection method for the inverter system. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices. The detection method for an inverter system provided in the embodiment of the present application is described below by taking the electronic device as an example of the execution subject.

[0118] like Figure 1 As shown, the detection method of the inverter system includes: step 110, step 120 and step 130.

[0119] The inverter system is connected to the arc detection system.

[0120] The arc detection system is used to sample the inverter system to determine if an arc is present.

[0121] Step 110, obtaining a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system;

[0122] In this step, the sampling signal is an input electrical signal of the inverter system or an inductor electrical signal of the inverter system.

[0123] The input electrical signal is a signal of the inverter system obtained by sampling the inverter system, and the input electrical signal can be represented by S.

[0124] The input electrical signal may be an input current.

[0125] The inductor electrical signal is the signal of the inverter system obtained by sampling the inverter system. The inductor electrical signal can be expressed as .

[0126] The inductor electrical signal may be an inductor current.

[0127] The sampling signal is obtained by sampling the inverter system through the arc detection system.

[0128] The first actual value is an actual value corresponding to the sampling signal.

[0129] In actual implementation, the inverter system can be sampled by the arc detection system to obtain an input electrical signal or an inductor electrical signal.

[0130] Step 120: Determine a saturation state of the sampled signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampled signal, and the minimum amplitude corresponding to the sampled signal;

[0131] In this step, the maximum amplitude is the upper limit of the amplitude for judging whether the sampling signal is saturated.

[0132] The minimum amplitude is the lower limit of the amplitude for judging whether the sampling signal is saturated.

[0133] The maximum amplitude and the minimum amplitude are the limiting values ​​of the sampling signal.

[0134] The saturation state is the saturation condition of the sampled signal.

[0135] Saturation states include: saturated or unsaturated.

[0136] In the actual implementation process, the sampling range of the sampling circuit of the arc detection system is mapped to the corresponding software, and the limiting range of the software sampling can be obtained.

[0137] Based on the analog-to-digital (AD) sampling specifications of the sampling chip, the software can obtain the maximum amplitude and the minimum amplitude of the sampling signal.

[0138] In some embodiments, when the sampling signal exceeds the sampling range of the sampling circuit, the sampling signal exceeds the limiting value of the sampling signal, that is, the sampling signal is greater than the maximum amplitude or the sampling signal is less than the minimum amplitude. At this time, it can be determined that the sampling signal is saturated.

[0139] In some embodiments, when the sampled signal is not greater than the maximum amplitude and the sampled signal is not less than the minimum amplitude, it can be determined that the sampled signal is not saturated.

[0140] Step 130: Perform arc detection based on the saturation state.

[0141] In this step, after the saturation state of the sampling signal is determined, arc detection may be performed based on the actual situation of the saturation state to determine whether an arc exists.

[0142] In some embodiments, when the sampling signal is not saturated, the sampling signal may be further analyzed to determine whether an arc exists.

[0143] In other embodiments, when the sampling signal is saturated, analysis based on the saturated sampling signal will affect the accuracy of the analysis result. In this case, the sampling signal can be processed and analysis can be performed based on the processed sampling signal to determine whether an arc exists.

[0144] like Figure 2 As shown, after the sampling signal is obtained, a saturation detection is performed on the sampling signal. When the sampling signal is not saturated, the sampling signal is used for subsequent arc detection.

[0145] According to the detection method of the inverter system provided in the embodiment of the present application, the inverter system is sampled to obtain a sampling signal, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

[0146] In some embodiments, step 130 may further include:

[0147] When the saturation state is saturated, desaturation processing is performed on the sampling signal to obtain an unsaturated sampling signal;

[0148] Arc detection is performed based on the unsaturated sampling signal.

[0149] In this embodiment, the desaturation process is an operation of processing a saturated sampled signal into an unsaturated sampled signal.

[0150] It can be understood that the original signal is limited within the limit due to the sampling limit. When the sampling signal exceeds the limit, the saturation state of the sampling signal will be judged as saturation. The sampling signal is affected by the operating conditions of the inverter system. In the absence of an arc, the sampling signal may reach saturation, and desaturation measures can be taken for the sampling signal.

[0151] Sampling signal saturation will cause signal distortion and affect the accuracy of software analysis. At this time, the saturated sampling signal can be desaturated to obtain an unsaturated sampling signal to ensure that the sampling signal is not distorted and the accuracy of arc detection is guaranteed.

[0152] In the actual implementation process, there will be a resonance point between the capacitive reactance and inductive reactance of the photovoltaic panel and the photovoltaic inverter in the inverter system. The input voltage and input current run on the current-voltage curve of the photovoltaic panel. When the operation is close to the resonance point, the input current ripple will increase, thereby causing the sampling signal to increase until the amplitude of the sampling signal running at the resonance point is the largest. At this time, the current operating conditions need to be changed to avoid the resonance point in order to desaturate the sampling signal.

[0153] Continue to refer Figure 2 When the sampling signal is determined to be saturated by saturation detection, the sampling signal can be desaturated by desaturation measures to obtain an unsaturated sampling signal, and the unsaturated sampling signal can be used for subsequent arc detection.

[0154] According to the detection method of the inverter system provided in the embodiment of the present application, by desaturating the sampling signal when it is determined that the sampling signal is saturated, an unsaturated sampling signal is obtained, and arc detection is performed based on the unsaturated sampling signal, thereby ensuring the integrity of the sampling signal analysis and improving the accuracy of arc detection.

[0155] In some embodiments, performing desaturation processing on the sampled signal to obtain an unsaturated sampled signal may further include:

[0156] By adjusting at least one of the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system and the switching frequency of the switch tube in the inverter system, the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0157] In this embodiment, in the actual implementation process, the working characteristic of the photovoltaic panel in the inverter system is a current-voltage curve, and the curve is different under different light intensities and temperatures.

[0158] When the input voltage changes or the input current changes, the input voltage and the input current both change along the curve. When the input voltage changes, the input current will also change accordingly. When the input current changes, the input voltage will also change accordingly.

[0159] In the actual implementation process, changing the working condition of the inverter system can make the input voltage and input current not run at the resonance point of the hardware circuit, which can reduce the degree to which the sampling approaches saturation.

[0160] In some embodiments, the input voltage of the inverter system can be increased or decreased (such as adjusting the output voltage of a photovoltaic panel), thereby causing the input voltage to change. , until the sampling signal is desaturated and an unsaturated sampling signal is obtained.

[0161] In some embodiments, the input current of the inverter system can be increased or decreased (such as adjusting the output current of a photovoltaic panel), thereby causing the input current to change. , until the sampling signal is desaturated and an unsaturated sampling signal is obtained.

[0162] In some embodiments, the input power of the inverter system may be increased or decreased (eg, to adjust the output power of a photovoltaic panel), thereby changing the input current and input voltage until the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0163] In some embodiments, the rated input current of the inverter system can be reduced to limit the upper limit of the input current and make the input current change , until the sampling signal is desaturated and an unsaturated sampling signal is obtained.

[0164] In some embodiments, the rated input power of the inverter system may be reduced, thereby changing the input voltage and input current until the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0165] Adjusting the bus voltage of the inverter system may also desaturate the sampled signal.

[0166] In some embodiments, the bus voltage of the inverter system is adjusted to desaturate the sampling signal to obtain an unsaturated sampling signal, which may also include:

[0167] At least one of the bus voltage corresponding to the inverter system, the bus voltage corresponding to the battery pack electrically connected to the inverter, and the bus voltage corresponding to the charging pile electrically connected to the inverter is adjusted, and the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0168] In this embodiment, the inverter system may be a photovoltaic inverter.

[0169] It is understandable that the inverter system has many applicable scenarios. In different scenarios, in addition to adjusting the bus voltage of the photovoltaic inverter, the bus voltage of the inverter system can also be changed through other devices.

[0170] In actual implementation, the photovoltaic inverter can be used in conjunction with a battery pack and a charging pile. Controlling one or more of them can change the bus voltage of the inverter system.

[0171] In actual implementation, bus voltage regulation is applicable to both AC voltage and DC voltage regulation.

[0172] Charging piles can include: DC charging piles and AC charging piles.

[0173] In some embodiments, the bus voltage can be changed by adjusting at least one of the bus voltage corresponding to the photovoltaic inverter in the inverter system, the bus voltage corresponding to the battery pack, and the bus voltage corresponding to the charging pile. Until the sampling signal is desaturated, an unsaturated sampling signal is obtained.

[0174] In some embodiments, the output power of the photovoltaic inverter in the inverter system may be increased or decreased to change the bus voltage of the inverter system, and the sampling signal may be desaturated to obtain an unsaturated sampling signal.

[0175] In this embodiment, when the output power of the photovoltaic inverter in the inverter system increases, the demand for electric energy of the load on the bus will increase, thereby increasing the bus voltage until the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0176] When the output power of the photovoltaic inverter in the inverter system decreases, the demand for electric energy by the load on the bus will decrease, thereby reducing the bus voltage until the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0177] In other embodiments, the bus voltage of the inverter system may be reduced by lowering the upper limit of the bus voltage of the inverter system until the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0178] During the research and development process, the inventors discovered that when the sampling signal is saturated, the sampling signal will be distorted, affecting the accuracy of the analysis of the sampling signal; in the related art, the saturated frequency band is avoided by reducing the overall sampling gain or the gain of a certain frequency band and shortening the sampling passband; however, the above method has weak recognition ability for small signals, which reduces the integrity of the sampling analysis.

[0179] The present application desaturates the sampling signal by adjusting the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, so as to obtain an unsaturated sampling signal, thereby ensuring the ability to recognize small signals and the integrity of the sampling analysis, thereby improving the accuracy of arc detection.

[0180] According to the detection method of the inverter system provided in the embodiment of the present application, the bus voltage of the inverter system is effectively adjusted by adjusting the bus voltage corresponding to the photovoltaic inverter in the inverter system, the bus voltage corresponding to the battery pack used in conjunction with the photovoltaic inverter, and the bus voltage corresponding to the charging pile, and other methods. The available adjustment methods are flexibly selected to desaturate the saturated sampling signal to obtain an unsaturated sampling signal, so as to address the problem that the sampling signal may be distorted under saturation conditions, affecting the accuracy of the analysis of the sampling signal, and improving the accuracy of arc detection.

[0181] In the actual implementation process, when the photovoltaic inverter runs to the resonance point, the resonance frequency between the capacitive reactance and the inductive reactance of the photovoltaic panel and the photovoltaic inverter is the same as or close to the switching frequency of the switching tube. At this time, by adjusting the switching frequency of the switching tube, the distance between the switching frequency and the resonance point can be increased to avoid the resonance point until the sampling signal is desaturated.

[0182] It is understandable that the switching frequency change of the switch tube must meet the hardware stress tolerance range of the switch tube.

[0183] A switching tube can be a switching tube that converts one type of direct current into another type of direct current.

[0184] According to the detection method of the inverter system provided in the embodiment of the present application, the saturated sampling signal is desaturated by adjusting the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system, and the switching frequency of the switching tube. The user can flexibly select the desaturation method based on the actual usage scenario to obtain a desaturated sampling signal, thereby improving the user experience.

[0185] In actual implementation, the saturation state of the sampled signal can be determined in a variety of ways.

[0186] Various methods for determining the saturation state of the sampled signal are described below.

[0187] First, analog digital sampling analysis to determine saturation

[0188] In some embodiments, step 120 may further include:

[0189] Obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude;

[0190] Based on the maximum amplitude, the minimum amplitude and the sensitivity information, the target threshold is obtained;

[0191] A saturation state of the sampled signal is determined based on at least two of the target saturation level, the first actual value, and the target threshold value.

[0192] In this embodiment, the target saturation degree is the near saturation degree of the sampling signal determined based on the correlation between the first actual value and the maximum amplitude and the minimum amplitude. The target saturation degree can be expressed as E.

[0193] The target saturation level is used for subsequent saturation state determination.

[0194] The sensitive information is determined based on the correlation between the target saturation level of the inverter system and the accuracy of the arc detection result, and the sensitive information can be expressed as Se.

[0195] The sensitivity information can be used to characterize the inverter system's perception of the target saturation level.

[0196] In the actual implementation process, the impact of the photovoltaic inverter on the arc detection judgment result at different target saturation levels can be evaluated based on experimental tests, so as to determine the specific value of the sensitive information based on the degree of impact.

[0197] For example, when the target saturation level of the sampling signal is high (i.e., the sampling signal is relatively close to saturation), the accuracy of the arc detection result is A%, and the impact of the target saturation level on the accuracy of the arc detection result may be X. At this time, the sensitive information can be confirmed as X.

[0198] When the target saturation of the sampling signal is low, the accuracy of the arc detection result is B%, and the impact of the target saturation on the accuracy of the arc detection result may be Y; at this time, the sensitive information can be confirmed as Y.

[0199] In the actual implementation process, multiple groups of experimental data can be carried out to analyze the impact of different target saturation levels on the arc detection judgment results, so as to determine the specific value of the sensitive information based on the degree of impact.

[0200] The target threshold is a set value for determining the saturation state of the sampled signal.

[0201] In the actual execution process, the first actual value can be processed by the maximum amplitude and the minimum amplitude to obtain the target saturation degree of the sampling signal, and based on the maximum amplitude, the minimum amplitude and the sensitivity information, the target threshold for judging the saturation state of the sampling signal can be obtained, thereby determining the saturation state of the sampling signal based on the correlation between the target saturation state and the target threshold, or based on the correlation between the first actual value and the target threshold.

[0202] According to the detection method of the inverter system provided in the embodiment of the present application, the target saturation degree and the target threshold value of the sampling signal are determined respectively by one or more of the first actual value, the maximum amplitude, the minimum amplitude and the sensitive information of the sampling signal, so that the saturation state of the sampling signal is effectively determined based on the target saturation degree and the correlation between the first actual value and the target threshold value, and the judgment method is simple and convenient with strong operability.

[0203] In the actual implementation process, the first actual value, the maximum amplitude and the minimum amplitude may be processed differently to obtain different target saturation levels and target thresholds, thereby determining the saturation state of the sampled signal through the corresponding judgment method.

[0204] The following describes how the first actual value, the maximum amplitude, and the minimum amplitude are processed in different ways to determine the saturation state.

[0205] (1) Determine the saturation state by processing the first actual value

[0206] In some embodiments, obtaining a target threshold based on the maximum amplitude, the minimum amplitude, and the sensitivity information may further include:

[0207] Determine a first threshold based on the sensitivity information, the maximum amplitude and the minimum amplitude; the first threshold is not greater than a first ratio determined based on the maximum amplitude and the first difference; the first difference is determined based on the maximum amplitude and the minimum amplitude;

[0208] Determine a second threshold based on the target value, the sensitivity information, the maximum amplitude and the minimum amplitude; the second threshold is not less than a second ratio determined based on the minimum amplitude and the first difference, and the second threshold is less than the first threshold;

[0209] Based on the first threshold and the second threshold, a target threshold is determined.

[0210] In this embodiment, the first threshold is a maximum reference value for determining a saturation state of the sampling signal.

[0211] The second threshold is a minimum reference value for determining a saturation state of the sampling signal.

[0212] The target value is a constant used to determine the second threshold, and the target value may be 1.

[0213] The first threshold can be determined based on the following formula:

[0214]

[0215] in, is the first threshold; is the minimum amplitude; is the maximum value; For sensitive information; is the second functional relationship.

[0216] The sensitivity information is a value of [0-1], and the sensitivity information can also be expressed as a value of [0%, 100%].

[0217] Specifically, the first threshold may also be determined based on the following formula:

[0218]

[0219] in, is the first threshold; is the minimum amplitude; is the maximum value; For sensitive information.

[0220] The second threshold can be determined based on the following formula:

[0221]

[0222] in, is the second threshold; is the minimum amplitude; is the maximum value; For sensitive information; is the third functional relationship.

[0223] Specifically, the second threshold may also be determined based on the following formula:

[0224]

[0225] in, is the second threshold; is the minimum amplitude; is the maximum value; For sensitive information.

[0226] The first difference is determined based on the following formula:

[0227]

[0228] in, is the first difference; is the minimum amplitude; is the maximum value.

[0229] The first ratio is determined based on the following formula:

[0230]

[0231] in, is the first ratio, is the minimum amplitude, is the maximum value.

[0232] The second ratio is determined based on the following formula:

[0233]

[0234] in, is the second ratio, is the minimum amplitude, is the maximum value.

[0235] The correlation relationship between the first threshold and the second threshold can be determined based on the following formula:

[0236]

[0237] In the actual implementation process, the first threshold can be determined based on the sensitivity information, the maximum amplitude and the minimum amplitude; the second threshold can be determined based on the target value, the sensitivity information, the maximum amplitude and the minimum amplitude; the first threshold and the second threshold are jointly determined as the target threshold used to judge the saturation state of the sampling signal.

[0238] According to the detection method of the inverter system provided in the embodiment of the present application, through multiple values ​​of the target value, sensitive information, maximum amplitude and minimum amplitude, and taking into account the limiting value of the sampling signal, the perception ability of the sensitive information to the near-saturation degree of the sampling signal is further considered to determine the first threshold and the second threshold. The determined first threshold and the second threshold are used together to judge the saturation state of the sampling signal. The method for determining the threshold is simple, convenient, scientific and reasonable, and provides a reference value for the subsequent judgment of the saturation state of the sampling signal.

[0239] In some embodiments, obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude may further include:

[0240] A target saturation level is obtained based on the first actual value, the maximum amplitude, and the minimum amplitude.

[0241] In this embodiment, the target saturation level can be determined based on the following formula:

[0242]

[0243] in, is the target saturation level; is the first actual value; is the minimum amplitude, is the maximum value; is the first functional relationship.

[0244] Specifically, the target saturation level can be determined based on the following formula:

[0245]

[0246] in, is the target saturation level; is the first actual value; is the minimum amplitude, is the maximum value.

[0247] In the actual execution process, the first actual value can be processed by the maximum amplitude and the minimum amplitude to obtain the target saturation degree, and the saturation state of the sampling signal can be determined based on the target saturation degree.

[0248] According to the detection method of the inverter system provided in the embodiment of the present application, the first actual value is processed by the maximum amplitude and the minimum amplitude to obtain the near-saturation degree of the sampling signal, that is, the target saturation degree, so that the saturation state of the sampling signal is determined based on the target saturation degree. The processing method is simple and easy to operate, which effectively improves the judgment efficiency.

[0249] In some embodiments, determining the saturation state of the sampled signal based on at least two of the target saturation level, the first actual value, and the target threshold value may further include:

[0250] When the target saturation degree is not less than the first threshold or the target saturation degree is not greater than the second threshold, determining that the sampling signal is saturated;

[0251] When the target saturation level is greater than the second threshold and the target saturation level is less than the first threshold, it is determined that the sampling signal is not saturated.

[0252] In this embodiment, during the actual execution process, the correlation between the target saturation degree and the target threshold value may be analyzed to obtain the saturation determination result of the sampling signal to determine the saturation state of the sampling signal.

[0253] The saturation state can be determined based on the following formula:

[0254]

[0255] in, is saturated, is the target saturation level; is the first threshold; is the second threshold; is the fourth functional relationship.

[0256] In some embodiments, when the target saturation level is not less than a first threshold, it is determined that the sampled signal is saturated.

[0257] In some embodiments, when the target saturation level is not greater than a second threshold, it is determined that the sampled signal is saturated.

[0258] In some other embodiments, when the target saturation level is greater than the second threshold and the target saturation level is less than the first threshold, it is determined that the sampled signal is not saturated.

[0259] In actual implementation, the saturation state of the sampled signal can be determined based on the following relationship:

[0260]

[0261] in, is saturated, is the target saturation level; is the first threshold; is the second threshold.

[0262] According to the detection method of the inverter system provided in the embodiment of the present application, the saturation state of the sampling signal is effectively determined by comparing the target saturation degree obtained by processing the first actual value with the determined target threshold value. The judgment logic is simple and convenient, and easy to operate, which improves the efficiency of judging the saturation state of the sampling signal, thereby improving the efficiency of arc detection.

[0263] In some embodiments, determining the saturation state of the sampled signal based on at least two of the target saturation level, the first actual value, and the target threshold value may further include:

[0264] When the first actual value is not less than the first threshold value or the first actual value is not greater than the second threshold value, determining that the sampling signal is saturated;

[0265] In a case where the first actual value is greater than the second threshold and the first actual value is less than the first threshold, it is determined that the sampled signal is not saturated.

[0266] In this embodiment, in the actual execution process, after obtaining the target threshold, the saturation determination result of the sampling signal can be obtained by comparing the correlation relationship between the first actual value and the target threshold to determine the saturation state of the sampling signal.

[0267] In some embodiments, when a first actual value of the sampled signal is not less than a first threshold, it is determined that the sampled signal is saturated.

[0268] In some embodiments, when the first actual value of the sampled signal is not greater than a second threshold, it is determined that the sampled signal is saturated.

[0269] In some other embodiments, when the first actual value of the sampling signal is greater than the second threshold and the first actual value is less than the first threshold, it is determined that the sampling signal is unsaturated, that is, when the first actual value is between the first threshold and the second threshold, it is determined that the sampling signal is unsaturated.

[0270] In the actual implementation process, the saturation state of the sampled signal can also be determined based on the following relationship:

[0271]

[0272] in, is saturated, is the first actual value; is the first threshold; is the second threshold.

[0273] According to the detection method of the inverter system provided in the embodiment of the present application, the saturation state of the sampling signal is effectively determined by directly comparing the first actual value with the determined target threshold value, and the judgment logic is simple, convenient and easy to operate.

[0274] (2) Determine the saturation state by the maximum difference

[0275] In some embodiments, obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude may further include:

[0276] Obtaining the maximum and minimum values ​​of the first actual values ​​of each sampling signal within the target period;

[0277] Based on the maximum and minimum values, the target saturation level is obtained.

[0278] In this embodiment, the target period is a period for sampling the inverter system.

[0279] The target period can be user-defined or determined based on actual conditions, and this application does not limit this.

[0280] In the actual execution process, a group of sampling signals can be obtained by sampling the inverter system within the target period, and the maximum value and the minimum value of the sampling signals can be obtained by comparing the group of sampling signals.

[0281] In the actual execution process, the target saturation degree can be obtained by processing the maximum value and the minimum value.

[0282] The target saturation level can be determined based on the following formula:

[0283]

[0284] in, is the target saturation level; is the minimum value; is the maximum value; It is the fifth functional relationship.

[0285] Specifically, the target saturation degree can also be determined based on the following formula:

[0286]

[0287] in, is the target saturation level; is the minimum value; is the maximum value.

[0288] In the actual execution process, the maximum and minimum values ​​of the sampling signal can be calculated, and the degree of saturation (i.e., the target saturation degree) can be reflected by the difference between the maximum and minimum values.

[0289] The larger the extreme value difference is, the closer to saturation is, and the smaller the extreme value difference is, the smaller the closer to saturation is.

[0290] According to the detection method of the inverter system provided in the embodiment of the present application, the near-saturation degree of the sampling signal is reflected by the difference between the maximum value and the minimum value of the sampling signal, and the saturation state of the sampling signal is effectively determined. The judgment method is simple and convenient.

[0291] In some embodiments, determining the saturation state of the sampled signal based on the target saturation level and the target threshold may further include:

[0292] When the target saturation degree is not less than the target threshold, determining that the sampling signal is saturated;

[0293] When the target saturation level is less than the target threshold value, it is determined that the sampled signal is not saturated.

[0294] In this embodiment, the target threshold can be determined based on the following formula:

[0295]

[0296] in, is the target threshold; is the minimum amplitude; is the maximum value; For sensitive information; This is the sixth relation.

[0297] Specifically, the target threshold may also be determined based on the following formula:

[0298]

[0299] in, is the target threshold; is the minimum amplitude; is the maximum value; For sensitive information.

[0300] In actual implementation, the target saturation level may be compared with a target threshold to determine the saturation state of the sampled signal.

[0301] The saturation state can be determined based on the following relationship:

[0302]

[0303] in, is saturated; is the target saturation level; is the target threshold; It is the seventh functional relationship.

[0304] The saturation state can be determined based on the following relationship:

[0305]

[0306] in, is saturated; is the target saturation level; is the target threshold.

[0307] According to the detection method of the inverter system provided in the embodiment of the present application, the saturation state of the sampling signal is effectively judged by comparing the target saturation degree determined based on the difference between the maximum value and the minimum value with the target threshold value. The judgment logic is simple and convenient, thereby improving the efficiency of judging the saturation state of the sampling signal.

[0308] (3) Upper and lower limits to determine saturation status

[0309] In some embodiments, obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude may further include:

[0310] Based on the first actual value and the maximum amplitude, a first sub-goal saturation degree is obtained;

[0311] Based on the first actual value and the minimum amplitude, a second sub-target saturation degree is obtained;

[0312] Based on the first sub-target saturation degree and the second sub-target saturation degree, a target saturation degree is obtained.

[0313] In this embodiment, the first sub-goal saturation level can be determined based on the following formula:

[0314]

[0315] in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value; It is the eighth functional relationship.

[0316] The second sub-goal saturation level can be determined based on the following formula:

[0317]

[0318] in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude; It is the ninth functional relationship.

[0319] In some embodiments, the first sub-goal saturation level may also be determined based on the following formula:

[0320]

[0321] in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value.

[0322] The second sub-goal saturation degree can also be determined based on the following formula:

[0323]

[0324] in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude.

[0325] It can be understood that the maximum amplitude is not less than the minimum amplitude, and based on the maximum amplitude and the minimum amplitude, the positive or negative situation of the difference between the maximum amplitude and the minimum amplitude and the first actual value can be controlled.

[0326] In some other embodiments, the first sub-goal saturation level may also be determined based on the following formula:

[0327]

[0328] in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value.

[0329] The second sub-goal saturation degree can also be determined based on the following formula:

[0330]

[0331] in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude.

[0332] In this embodiment, In the case of , the sampling signal is saturated. At this time, .

[0333] exist In the case of , the sampling signal is saturated. At this time, .

[0334] According to the detection method of the inverter system provided in the embodiment of the present application, the target saturation degree is determined based on the difference between the maximum amplitude and the first actual value and the difference between the minimum amplitude and the first actual value, respectively, and the saturation state of the sampling signal is effectively judged based on the obtained target saturation degree, and the judgment logic is simple and convenient.

[0335] In some embodiments, determining the saturation state of the sampled signal based on the target saturation level and the target threshold may further include:

[0336] When the saturation degree of the first sub-target is not greater than the target threshold or the saturation degree of the second sub-target is not greater than the target threshold, determining that the sampling signal is saturated;

[0337] In the case where the first sub-target saturation level is greater than the target threshold and the second sub-target saturation level is greater than the target threshold, it is determined that the sampling signal is not saturated.

[0338] In this embodiment, the target threshold can be determined based on the following formula:

[0339]

[0340] in, is the target threshold; is the minimum amplitude; is the maximum value; For sensitive information; It is the tenth functional relationship.

[0341] Specifically, the target threshold can be determined based on the following formula:

[0342]

[0343] in, is the target threshold; is the minimum amplitude; is the maximum value; For sensitive information.

[0344] The saturation state can be determined based on the following relationship:

[0345]

[0346] in, is saturated; is the saturation level of the first sub-goal; is the saturation level of the second sub-goal.

[0347] According to the detection method of the inverter system provided in the embodiment of the present application, the saturation state of the sampling signal is effectively determined by comparing the first sub-target saturation degree and the second sub-target saturation degree with the target threshold. The judgment logic is simple, easy to operate, and the saturation state judgment efficiency is high.

[0348] Second, the inductor electrical signal analysis determines the saturation state

[0349] In some embodiments, when the sampled signal is an inductor electrical signal, step 120 may further include:

[0350] The saturation state of the inductor electrical signal is determined based on a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system.

[0351] In this embodiment, during the actual implementation, the inductor suppresses current changes. When the inductance is small or the circuit resonates, the inductor cannot effectively suppress input current fluctuations, which will cause the sampling signal to increase, thereby making the sampling signal close to saturation or saturation.

[0352] In the actual implementation process, a current ripple that can characterize the saturation state of the inductor electrical signal can be obtained through the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, so as to determine the saturation state of the inductor electrical signal based on the obtained current ripple.

[0353] According to the detection method of the inverter system provided in the embodiment of the present application, the current ripple of the inductor electrical signal is calculated by collecting the inductor electrical signal, the input voltage of the inverter system and the switching frequency of the switch tube in the inverter system, so as to judge the saturation degree of the sampling signal based on the current ripple of the inductor electrical signal, effectively determine the saturation state of the sampling signal, and the judgment method is simple and convenient.

[0354] In some embodiments, determining the saturation state of the inductor electrical signal based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system may also include:

[0355] Obtaining a target current ripple based on at least one of a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system;

[0356] Based on the inductor electrical signal and the inductor current sensitivity information, a target ripple threshold is obtained;

[0357] A saturation state of the inductor electrical signal is determined based on the target current ripple and the target ripple threshold.

[0358] In this embodiment, the target current ripple is a current ripple calculated based on the first actual value of the inductor electrical signal.

[0359] The target current ripple can be used to determine the saturation state of the inductor electrical signal.

[0360] The target ripple threshold is a set value for determining the saturation state of the inductor electrical signal.

[0361] The inductor current sensitive information is determined based on a ratio of a maximum value corresponding to a current ripple range of the inductor electrical signal to a first actual value of the inductor electrical signal.

[0362] In the actual implementation process, based on the range of normal current ripple under different inductor electrical signals under experimental tests, the ratio of the maximum value of the normal current ripple to the inductor current is used to determine the inductor current sensitive information.

[0363] When the current ripple becomes abnormally large, it means that there is a risk of sampling saturation under the working conditions corresponding to the current acquisition moment.

[0364] The target ripple threshold can be determined based on the following formula:

[0365]

[0366] in, is the target ripple threshold; is the inductor current; It is the sensitive information of inductor current.

[0367] In the actual implementation process, the target current ripple of the inductor electrical signal can be calculated through the inductor electrical signal, and the target current ripple of the inductor electrical signal of the designed photovoltaic inverter can be evaluated according to experimental tests. Sensitive information about inductor current The correlation between them is used to determine whether the sampling signal is saturated.

[0368] In some embodiments, obtaining the target current ripple based on at least one of the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system may further include:

[0369] Obtaining a maximum inductor current value and a minimum inductor current value in the first actual value of each inductor electrical signal within a target period;

[0370] Based on the maximum inductor current value and the minimum inductor current value, a target current ripple is obtained.

[0371] In this embodiment, the maximum inductor current value is the maximum value of the first actual values ​​of the inductor electrical signals within the target period.

[0372] The minimum inductor current value is the minimum value of the first actual values ​​of the inductor electrical signals within the target cycle.

[0373] The target current ripple can be determined based on the following formula:

[0374]

[0375] in, is the target current ripple; is the maximum inductor current value; is the minimum inductor current value.

[0376] According to the detection method of the inverter system provided in the embodiment of the present application, the target current ripple is obtained by the difference between the maximum inductor current value and the minimum inductor current value in the actual values ​​of each inductor electrical signal collected within the target period to reflect the saturation degree of the inductor electrical signal, effectively determine the saturation state of the inductor electrical signal, and the judgment method is simple and convenient.

[0377] In some embodiments, obtaining the target current ripple based on at least one of the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system may further include:

[0378] A target current ripple is obtained based on a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system.

[0379] In this embodiment, the current ripple of the inductor electrical signal may be determined based on the following formula:

[0380]

[0381] in, is the target current ripple; is the first actual value of the inductor electrical signal; is the input voltage of the inverter system; is the switching frequency of the switch tube; It is the twelfth functional relationship.

[0382] Specifically, the target current ripple can be determined based on the following formula:

[0383]

[0384] in, is the target current ripple; is the first actual value of the inductor electrical signal; is the input voltage of the inverter system; is the switching frequency of the switch tube.

[0385] According to the detection method of the inverter system provided in the embodiment of the present application, the target current ripple calculated by the first actual value of the inductor electrical signal, the input voltage of the inverter system and the switching frequency of the switch tube is scientific and reasonable, and effectively reflects the saturation degree of the inductor electrical signal.

[0386] In an actual implementation process, after obtaining the target current ripple and the target ripple threshold, the correlation between the two can be compared to determine the saturation state of the inductor electrical signal.

[0387] The saturation state of the inductor electrical signal can be determined based on the following formula:

[0388]

[0389] in, is saturated; is the target ripple threshold; is the target current ripple; It is the fourteenth functional relationship.

[0390] According to the detection method of the inverter provided in the embodiment of the present application, the target current ripple is determined by the maximum inductor current value and the minimum inductor current value of the inductor electrical signal and the difference between the maximum inductor current value and the minimum inductor current value, and the target ripple threshold is determined based on the inductor current sensitive information and the inductor current, so as to determine the saturation state of the inductor electrical signal based on the correlation between the target current ripple and the target ripple threshold, and the scientificity and rationality of the judgment condition are improved by processing the inductor electrical signal, thereby improving the accuracy of determining the saturation state.

[0391] In some embodiments, determining the saturation state of the inductor electrical signal based on the target current ripple and the target ripple threshold may further include:

[0392] When the target current ripple is not less than the target ripple threshold, determining that the inductor electrical signal is saturated;

[0393] When the target current ripple is less than the target ripple threshold, it is determined that the inductor electrical signal is not saturated.

[0394] In this embodiment, during actual implementation, the saturation state of the inductor electrical signal may be determined by comparing the target current ripple with the target ripple threshold.

[0395] The saturation state of the inductor electrical signal can be determined based on the following formula:

[0396]

[0397] Among them, among them, is saturated; is the target current ripple; is the target ripple threshold.

[0398] According to the detection method of the inverter system provided in the embodiment of the present application, by comparing the correlation between the target current ripple and the target ripple threshold, the saturation state of the inductor electrical signal is effectively determined, and the judgment logic is simple and easy to implement.

[0399] Third, algorithm detection determines saturation

[0400] In some embodiments, step 120 may further include:

[0401] Performing data transformation on the first actual value to obtain target transformed data;

[0402] Performing algorithm analysis on target transformation data to obtain algorithm analysis results;

[0403] Based on the algorithm analysis results, the saturation state of the sampled signal is determined.

[0404] In this embodiment, the target transformation data is data obtained after data transformation is performed on the first actual value of the sampling signal.

[0405] The algorithm analysis result is a result obtained by performing algorithm analysis on the processed data and can characterize the saturation state of the sampling signal.

[0406] Data transformation methods may include fast Fourier transform and wavelet transform.

[0407] In the actual execution process, before performing data transformation on the first actual value, data preprocessing may be performed on the first actual value, and data postprocessing may be performed on the target transformed data obtained after the data transformation.

[0408] Data preprocessing and data postprocessing can also be changed accordingly to facilitate subsequent algorithm analysis.

[0409] Of course, data pre-processing and data post-processing may be performed on the sampled signal in any feasible manner, and this application does not limit this.

[0410] Data preprocessing can include checking the collected data, supplementing missing values, and other operations.

[0411] Data post-processing may include normalizing the target transformed data and other operations.

[0412] In some embodiments, the entire data collected within the target period may be cut into lists of the same length; then a fast Fourier transform is performed on the data in each list to obtain target transformed data.

[0413] In other embodiments, the entire data sampled within the target period may be processed for abnormal maximum values, and the entire data sampled may be checked to supplement insufficient or missing values; then the entire data may be subjected to wavelet transformation to obtain target transformed data.

[0414] Methods of algorithm analysis may include: expert experience pre-fabrication, linear regression, machine learning, neural networks, convolutional neural networks, and recurrent neural networks.

[0415] In some embodiments, multiple algorithm analysis models may be fused, and algorithm analysis may be performed based on the fused model.

[0416] During the actual execution process, the sampling signal can be converted from the time domain to the frequency domain by performing data transformation on the first actual value, thereby obtaining a spectrum diagram corresponding to the sampling signal; by performing feature recognition, i.e., algorithm analysis, on the obtained spectrum diagram, an algorithm analysis result characterizing the spectrum characteristics can be obtained, thereby determining the saturation state of the sampling signal based on the spectrum characteristics in the algorithm analysis result.

[0417] like Figure 3 As shown, after obtaining the first actual value of the sampling signal, data preprocessing can be performed on the first actual value, and data transformation can be performed on the preprocessed data to obtain target transformation data, and algorithm analysis is performed based on the target transformation data to determine the saturation state of the sampling signal.

[0418] According to the detection method of the inverter system provided in the embodiment of the present application, by performing data transformation on the first actual value of the sampling signal, the accuracy of the data is improved and the usage scenarios of the data are expanded, so that the data has universality, and algorithm analysis is performed based on the processed data to obtain the algorithm analysis result, thereby determining the saturation state of the sampling signal and improving the accuracy of the judgment of the saturation state of the sampling signal.

[0419] In some embodiments, performing algorithm analysis on the target transformation data to obtain the algorithm analysis result may include:

[0420] grouping the target transformation data to obtain at least one target data group;

[0421] Calculate the statistical information corresponding to each target data group;

[0422] Based on the statistical information, determine the weight information of each target data group;

[0423] Based on the weight information and each target data group, algorithm analysis is performed to obtain algorithm analysis results.

[0424] In this embodiment, the target data group is a data group obtained by dividing the target transformation data.

[0425] The amount of data included in the target data group can be user-defined or determined based on actual conditions, and this application does not limit this.

[0426] In the actual implementation process, the target data can be grouped in any feasible way, which is not limited in this application.

[0427] For example, the target transformation data may be divided into 10 groups or 20 groups.

[0428] For another example, multiple target data groups are obtained by grouping each data group into 10 pieces of data.

[0429] Statistical information is information obtained by performing statistical analysis on the data in the target data set.

[0430] The statistical information may be statistical data such as a mean value corresponding to the target data group and a maximum value corresponding to the target data group.

[0431] The weight information is used to characterize the importance of the data corresponding to the target data group.

[0432] During the actual execution process, the target transformation data are grouped to obtain multiple target data groups, and then statistical analysis is performed on each target data group, such as calculating the maximum value corresponding to each target data group and the mean value corresponding to each target data group, and based on the maximum value corresponding to each target data group and the mean value corresponding to each target data group, weight information is assigned to each target data group, and the weight information is added to each target data group. Algorithmic analysis is performed on the target data groups containing the weight information to obtain the saturation state of the sampling signal.

[0433] According to the detection method of the inverter provided in the embodiment of the present application, the target transformation data is grouped to obtain the target data group, and statistical analysis is performed on each target data group, and the data is divided into smaller data units for statistical analysis, thereby improving the efficiency of data analysis and accurately acquiring the characteristics of the data; a weight is given to each target data group based on the statistical information of the data, and the importance of each target data group is effectively determined, and the determination method is based on the characteristics of the data group itself and is scientific, thereby improving the accuracy of subsequent sampling signal saturation state judgment.

[0434] In some embodiments, determining the saturation state of the sampled signal based on the algorithm analysis result may include:

[0435] Based on the algorithm analysis results, the spectrum characteristics are determined;

[0436] Based on the frequency spectrum characteristics, the saturation state of the sampled signal is determined.

[0437] In this embodiment, when the sampling signal is saturated, it will cause the spectrum diffusion of the frequency domain analysis. The spectrum characteristics can be determined based on the algorithm analysis result to obtain the saturation state of the sampling signal.

[0438] For example, when the frequency spectrum characteristic is spectrum diffusion, the saturation state of the sampled signal may be determined to be saturation.

[0439] When the spectrum characteristic is that the spectrum is not diffused, it can be determined that the saturation state of the sampled signal is unsaturated.

[0440] like Figure 4 As shown, when it is determined through algorithm detection that the sampling signal is saturated, the sampling signal can be desaturated to obtain an unsaturated sampling signal.

[0441] According to the inverter detection method provided in the embodiment of the present application, the spectrum characteristics corresponding to the sampling signal can be obtained through algorithm analysis results, and the saturation state of the sampling signal can be effectively determined based on the actual situation of the spectrum characteristics. The judgment method is simple and easy to understand.

[0442] In some embodiments, determining the saturation state of the sampled signal based on the spectrum characteristics may include:

[0443] Based on the spectrum characteristics, the arc state is determined; the arc state includes: arc generation or no arc generation;

[0444] Based on the arc state, a saturation state of the sampled signal is determined.

[0445] In this embodiment, the arc state includes: arc is generated or arc is not generated.

[0446] When the sampling signal is saturated, it will cause spectrum diffusion in frequency domain analysis. Spectrum diffusion can characterize the generation of arc. At this time, the arc state can be determined based on the spectrum characteristics to obtain the saturation state of the sampling signal.

[0447] For example, when the frequency spectrum feature is frequency spectrum diffusion, the arc state is characterized as arc generation, and the saturation state of the sampling signal can be determined to be saturation.

[0448] When the frequency spectrum characteristic is that the frequency spectrum does not diffuse, the arc state is characterized as no arc is generated, and it can be determined that the saturation state of the sampling signal is unsaturated.

[0449] like Figure 5 As shown, the algorithm can be used to detect whether the sampling signal generates an arc, and the arc state can be determined based on the spectrum state of the result of the algorithm detection, thereby obtaining the saturation state of the sampling signal; in the case of an arc, the sampling signal is determined to be saturated, and desaturation measures can be taken for the sampling signal.

[0450] According to the detection method of the inverter provided in the embodiment of the present application, the saturation state of the sampling signal is effectively determined by the arc state corresponding to the algorithm analysis result. When it is determined that an arc is generated, the saturation of the sampling signal is effectively determined. The judgment logic is simple and easy to implement.

[0451] In the actual execution process, users can flexibly select a suitable judgment method based on the actual application scenario to determine the saturation state of the sampling signal from a variety of methods such as analog digital sampling analysis to determine the saturation state, inductor electrical signal analysis to determine the saturation state, and algorithm detection to determine the saturation state. The judgment method is flexible and applicable to a wide range of scenarios.

[0452] The detection method of the inverter system provided in the embodiment of the present application may be executed by a detection device of the inverter system. In the embodiment of the present application, the detection device of the inverter system executing the detection method of the inverter system is taken as an example to illustrate the detection device of the inverter system provided in the embodiment of the present application.

[0453] An embodiment of the present application also provides a detection device for an inverter system.

[0454] The inverter system is connected to the arc detection system.

[0455] like Figure 6 As shown, the detection device of the inverter system includes: a first processing module 610 , a second processing module 620 and a third processing module 630 .

[0456] The first processing module 610 is used to obtain a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system or an inductance electrical signal of the inverter system;

[0457] The second processing module 620 is used to determine the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal; the saturation state includes: saturation or unsaturation;

[0458] The third processing module 630 is used to perform arc detection based on the saturation state.

[0459] According to the detection device of the inverter system provided in the embodiment of the present application, the inverter system is sampled to obtain a sampling signal, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection and ensure the integrity of arc detection.

[0460] In some embodiments, the second processing module 620 may also be used to:

[0461] Obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude;

[0462] A target threshold is obtained based on the maximum amplitude, the minimum amplitude and the sensitivity information; the sensitivity information is determined based on the correlation between the target saturation degree of the inverter system and the accuracy of the arc detection result;

[0463] A saturation state of the sampled signal is determined based on at least two of the target saturation level, the first actual value, and the target threshold value.

[0464] In some embodiments, the second processing module 620 may also be used to:

[0465] Determine a first threshold based on the sensitivity information, the maximum amplitude and the minimum amplitude; the first threshold is not greater than a first ratio determined based on the maximum amplitude and the first difference; the first difference is determined based on the maximum amplitude and the minimum amplitude;

[0466] Determine a second threshold based on the target value, the sensitivity information, the maximum amplitude and the minimum amplitude; the second threshold is not less than a second ratio determined based on the minimum amplitude and the first difference, and the second threshold is less than the first threshold;

[0467] Based on the first threshold and the second threshold, a target threshold is determined.

[0468] In some embodiments, the second processing module 620 may also be used to:

[0469] A target saturation level is obtained based on the first actual value, the maximum amplitude, and the minimum amplitude.

[0470] In some embodiments, the second processing module 620 may also be used to:

[0471] When the target saturation degree is not less than the first threshold or the target saturation degree is not greater than the second threshold, determining that the sampling signal is saturated;

[0472] When the target saturation level is greater than the second threshold and the target saturation level is less than the first threshold, it is determined that the sampling signal is not saturated.

[0473] In some embodiments, the second processing module 620 may also be used to:

[0474] When the first actual value is not less than the first threshold value or the first actual value is not greater than the second threshold value, determining that the sampling signal is saturated;

[0475] In a case where the first actual value is greater than the second threshold and the first actual value is less than the first threshold, it is determined that the sampled signal is not saturated.

[0476] In some embodiments, the second processing module 620 may also be used to:

[0477] Obtaining the maximum and minimum values ​​of the first actual values ​​of each sampling signal within the target period;

[0478] Based on the maximum and minimum values, the target saturation level is obtained.

[0479] In some embodiments, the second processing module 620 may also be used to:

[0480] When the target saturation degree is not less than the target threshold, determining that the sampling signal is saturated;

[0481] When the target saturation level is less than the target threshold value, it is determined that the sampled signal is not saturated.

[0482] In some embodiments, the second processing module 620 may also be used to:

[0483] Based on the first actual value and the maximum amplitude, a first sub-goal saturation degree is obtained;

[0484] Based on the first actual value and the minimum amplitude, a second sub-target saturation degree is obtained;

[0485] Based on the first sub-target saturation degree and the second sub-target saturation degree, a target saturation degree is obtained.

[0486] In some embodiments, the second processing module 620 may also be used to:

[0487] When the saturation degree of the first sub-target is not greater than the target threshold or the saturation degree of the second sub-target is not greater than the target threshold, determining that the sampling signal is saturated;

[0488] In the case where the first sub-target saturation level is greater than the target threshold and the second sub-target saturation level is greater than the target threshold, it is determined that the sampling signal is not saturated.

[0489] In some embodiments, the second processing module 620 may also be used to:

[0490] The saturation state of the inductor electrical signal is determined based on a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system.

[0491] In some embodiments, the second processing module 620 may also be used to:

[0492] Obtaining a target current ripple based on at least one of a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system;

[0493] Based on the inductor electrical signal and the inductor current sensitivity information, a target ripple threshold is obtained; the inductor current sensitivity information is determined based on a ratio of a maximum value corresponding to a current ripple range of the inductor electrical signal to a first actual value of the inductor electrical signal;

[0494] A saturation state of the inductor electrical signal is determined based on the target current ripple and the target ripple threshold.

[0495] In some embodiments, the second processing module 620 may also be used to:

[0496] Obtaining a maximum inductor current value and a minimum inductor current value in the first actual value of each inductor electrical signal within a target period;

[0497] Based on the maximum inductor current value and the minimum inductor current value, a target current ripple is obtained.

[0498] In some embodiments, the second processing module 620 may also be used to:

[0499] A target current ripple is obtained based on a first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system.

[0500] In some embodiments, the second processing module 620 may also be used to:

[0501] When the target current ripple is not less than the target ripple threshold, determining that the inductor electrical signal is saturated;

[0502] When the target current ripple is less than the target ripple threshold, it is determined that the inductor electrical signal is not saturated.

[0503] In some embodiments, the second processing module 620 may also be used to:

[0504] Performing data transformation on the first actual value to obtain target transformed data;

[0505] Performing algorithm analysis on target transformation data to obtain algorithm analysis results;

[0506] Based on the algorithm analysis results, the saturation state of the sampled signal is determined.

[0507] In some embodiments, the second processing module 620 may also be used to:

[0508] grouping the target transformation data to obtain at least one target data group;

[0509] Calculate the statistical information corresponding to each target data group;

[0510] Based on the statistical information, determine the weight information of each target data group;

[0511] Based on the weight information and each target data group, algorithm analysis is performed to obtain algorithm analysis results.

[0512] In some embodiments, the second processing module 620 may also be used to:

[0513] Based on the algorithm analysis results, the spectrum characteristics are determined;

[0514] Based on the frequency spectrum characteristics, the saturation state of the sampled signal is determined.

[0515] In some embodiments, the second processing module 620 may also be used to:

[0516] Based on the spectrum characteristics, the arc state is determined; the arc state includes: arc generation or no arc generation;

[0517] Based on the arc state, a saturation state of the sampled signal is determined.

[0518] In some embodiments, the third processing module 630 may also be used to:

[0519] When the saturation state is saturated, desaturation processing is performed on the sampling signal to obtain an unsaturated sampling signal;

[0520] Arc detection is performed based on the unsaturated sampling signal.

[0521] In some embodiments, the third processing module 630 may also be used to:

[0522] By adjusting at least one of the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system and the switching frequency of the switch tube in the inverter system, the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0523] In some embodiments, the third processing module 630 may also be used to:

[0524] At least one of the bus voltage corresponding to the inverter system, the bus voltage corresponding to the battery pack electrically connected to the inverter, and the bus voltage corresponding to the charging pile electrically connected to the inverter is adjusted, and the sampling signal is desaturated to obtain an unsaturated sampling signal.

[0525] The detection device of the inverter system in the embodiment of the present application can be an inverter system, or an electronic device connected to the inverter system for communication, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or it can be other devices other than the terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc. It can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0526] The detection device of the inverter system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0527] The detection device of the inverter system provided in the embodiment of the present application can achieve Figures 1 to 5 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0528] An embodiment of the present application also provides an inverter system.

[0529] In some embodiments, the inverter system is detected based on the detection method of the inverter system described in any of the above embodiments.

[0530] According to the inverter system provided in the embodiment of the present application, the inverter system is sampled to obtain a sampling signal, and a saturation detection is performed on the sampling signal to determine the saturation state of the sampling signal, so that arc detection is performed based on the actual situation of the sampling signal, and the saturation state of the sampling signal is effectively judged. If the sampling signal is saturated, desaturation measures are taken to ensure that the sampling signal is not distorted, improve the accuracy of arc detection, and ensure the integrity of arc detection.

[0531] In some embodiments, the inverter system is used to be electrically connected to at least one of a battery pack and a charging station.

[0532] In this embodiment, the inverter system may be a photovoltaic inverter.

[0533] Photovoltaic inverters can be used in combination with battery packs and charging piles.

[0534] The structure diagram of photovoltaic inverter is as follows: Figure 7 shown.

[0535] like Figure 8 As shown, in some embodiments, a photovoltaic inverter is combined with at least one battery pack to obtain a photovoltaic storage device.

[0536] In some embodiments, the charging pile includes: a DC charging pile and an AC charging pile.

[0537] like Fig. 9 As shown, in some embodiments, a photovoltaic inverter is combined with a DC charging pile to obtain a photovoltaic DC charging pile device.

[0538] like Fig.10 As shown, in some embodiments, a photovoltaic inverter is combined with an AC charging pile to obtain a photovoltaic AC charging pile device.

[0539] like Fig.11As shown, in some embodiments, a photovoltaic inverter, a battery pack and a DC charging pile are combined to obtain a photovoltaic storage and charging DC pile device.

[0540] like Fig.12 As shown, in some embodiments, a photovoltaic inverter, a battery pack and an AC charging pile are combined to obtain a photovoltaic storage and charging AC pile device.

[0541] like Fig.13 As shown, in some embodiments, a photovoltaic inverter, a DC charging pile and an AC charging pile are combined to obtain a photovoltaic AC charging pile and a DC charging pile device.

[0542] like Fig.14 As shown, in some embodiments, a photovoltaic inverter, a battery pack, a DC charging pile and an AC charging pile are combined to obtain a photovoltaic storage charging AC pile and a DC pile device.

[0543] According to the inverter system provided in the embodiment of the present application, by combining and matching the photovoltaic inverter, battery pack and charging pile, a variety of connection methods can be obtained for users to use. Users can flexibly match them based on actual usage scenarios, which has a wide range of application scenarios and improves user experience.

[0544] An embodiment of the present application also provides an arc detection system based on the detection method of the inverter system described in any of the above embodiments.

[0545] In some embodiments, the arc detection system further includes: a sampling module and a signal processing module.

[0546] In this embodiment, the sampling module is used to collect sampling signals of the inverter system.

[0547] The signal processing module is used to process the sampled signal.

[0548] like Fig.15 As shown, in the actual execution process, the sampling signal collected by the sampling module is processed by the signal processing module to obtain the saturation state of the sampling signal.

[0549] like Fig.16 As shown, in some embodiments, the signal processing module may further include: a first comparator and a second comparator.

[0550] In this embodiment, the first comparator is used to perform an upper limit judgment on the sampling signal, that is, to judge whether the sampling signal is not less than the maximum amplitude, and the second comparator is used to perform a lower limit judgment on the sampling signal, that is, to judge whether the sampling signal is not greater than the minimum amplitude.

[0551] The first comparator can be set to a maximum amplitude.

[0552] The second comparator can set the minimum amplitude.

[0553] In the actual implementation process, when the first comparator is not less than the maximum amplitude, it is determined that the sampling signal is saturated.

[0554] In the case where the second comparator is not greater than the minimum amplitude, it is determined that the sampled signal is saturated.

[0555] like Fig.17 As shown, in some embodiments, the signal processing module may further include: a first comparator, a second comparator, and an OR gate.

[0556] In this embodiment, the OR gate is used to combine the determination results of the first comparator and the second comparator into one determination signal to determine the saturation status of the sampling signal.

[0557] like Fig.18 As shown, in some embodiments, the signal processing module may further include: an absolute value circuit and a comparator.

[0558] In this embodiment, the absolute value circuit is used to perform absolute value processing on the sampled signal.

[0559] In the actual implementation process, after the sampling signal is processed by the absolute value circuit, the processed data is input into the comparator to obtain the saturation state of the sampling signal.

[0560] According to the inverter system provided in the embodiment of the present application, the sampling signal is processed through the hardware sampling and analysis device, the sampling module and the signal processing module, and the saturation state of the sampling signal is effectively determined. The circuit structure is simple and the cost is low.

[0561] In some embodiments, Fig.19 As shown, an embodiment of the present application also provides an electronic device 1900, including a processor 1901, a memory 1902, and a computer program stored in the memory 1902 and executable on the processor 1901. When the program is executed by the processor 1901, each process of the detection method embodiment of the above-mentioned inverter system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0562] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0563] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned inverter system detection method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0564] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0565] An embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned detection method of the inverter system when executed by a processor.

[0566] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0567] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned inverter system detection method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0568] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0569] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0570] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the relevant technology, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, disk, CD), and includes a number of instructions for a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0571] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0572] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0573] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A detection method for an inverter system, characterized in that: The inverter system is connected to an arc detection system; the method comprises: Acquire a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system; the first actual value is an actual value corresponding to the sampling signal; Determine the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal; the saturation state includes: saturation or unsaturation; the maximum amplitude is the upper amplitude limit for determining whether the sampling signal is saturated; the minimum amplitude is the lower amplitude limit for determining whether the sampling signal is saturated; Based on the saturation state, performing arc detection; The performing arc detection based on the saturation state comprises: When the saturation state is saturated, desaturation processing is performed on the sampling signal by adjusting at least one of an input voltage of the inverter system, an input current of the inverter system, a bus voltage of the inverter system, and a switching frequency of a switch tube in the inverter system; The determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal comprises: Obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude; Based on the maximum amplitude, the minimum amplitude and the sensitivity information, a target threshold is obtained; the sensitivity information is determined based on the correlation between the target saturation level of the inverter system and the accuracy of the arc detection result; based on experimental tests, the influence of the inverter system on the arc detection result at different target saturation levels is evaluated, and the specific value of the sensitivity information is determined based on the influence level; Determining the saturation state of the sampled signal based on the target saturation level and the target threshold, or the first actual value and the target threshold; The obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude comprises: Obtaining the target saturation level based on the first actual value, the maximum amplitude, and the minimum amplitude; The target saturation level is determined based on the following formula: in, is the target saturation level; is the first actual value; is the minimum amplitude, is the maximum magnitude; or, Obtaining the maximum value and the minimum value of the first actual value of each of the sampling signals within a target period; Based on the maximum value and the minimum value, obtaining the target saturation degree; The target saturation level is determined based on the following formula: in, is the target saturation level; is the minimum value; is the maximum value; or, Based on the first actual value and the maximum amplitude, obtaining a first sub-goal saturation degree; Based on the first actual value and the minimum amplitude, obtaining a second sub-target saturation degree; Based on the first sub-target saturation degree and the second sub-target saturation degree, obtaining the target saturation degree; The saturation level of the first sub-goal is determined based on the following formula: in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value; The second sub-goal saturation level is determined based on the following formula: in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude; or, The saturation level of the first sub-goal is determined based on the following formula: in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value; The second sub-goal saturation level is determined based on the following formula: in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude.

2. The detection method of the inverter system according to claim 1, characterized in that: The obtaining of a target threshold based on the maximum amplitude, the minimum amplitude and the sensitivity information comprises: Determine a first threshold based on the sensitivity information, the maximum amplitude and the minimum amplitude; the first threshold is not greater than a first ratio determined based on the maximum amplitude and a first difference; the first difference is determined based on the maximum amplitude and the minimum amplitude; Based on the target value, the sensitivity information, the maximum amplitude and the minimum amplitude, a second threshold is determined; the second threshold is not less than a second ratio determined based on the minimum amplitude and the first difference, and the second threshold is less than the first threshold; the target value is a constant used to determine the second threshold, and the target value is 1; Determining the target threshold based on the first threshold and the second threshold; The first threshold is determined based on the following formula: in, is the first threshold; is the minimum amplitude; is the maximum value; For sensitive information; The second threshold is determined based on the following formula: in, is the second threshold; is the minimum amplitude; is the maximum value; For sensitive information.

3. The detection method of the inverter system according to claim 2, characterized in that: The determining the saturation state of the sampling signal based on the target saturation degree and the target threshold, or the first actual value and the target threshold, comprises: When the target saturation level is not less than the first threshold or the target saturation level is not greater than the second threshold, determining that the sampling signal is saturated; When the target saturation level is greater than the second threshold and the target saturation level is less than the first threshold, it is determined that the sampling signal is not saturated.

4. The detection method of the inverter system according to claim 3, characterized in that: The determining the saturation state of the sampling signal based on the target saturation degree and the target threshold, or the first actual value and the target threshold, comprises: When the first actual value is not less than the first threshold or the first actual value is not greater than the second threshold, determining that the sampling signal is saturated; In a case where the first actual value is greater than the second threshold and the first actual value is less than the first threshold, it is determined that the sampling signal is not saturated.

5. The detection method of the inverter system according to claim 1, characterized in that: The determining the saturation state of the sampling signal based on the target saturation degree and the target threshold, or the first actual value and the target threshold, comprises: When the target saturation level is not less than the target threshold, determining that the sampling signal is saturated; When the target saturation level is less than the target threshold, it is determined that the sampling signal is not saturated.

6. The detection method of the inverter system according to claim 1, characterized in that: The determining the saturation state of the sampling signal based on the target saturation degree and the target threshold, or the first actual value and the target threshold, comprises: In the case where the saturation degree of the first sub-target is not greater than the target threshold or the saturation degree of the second sub-target is not greater than the target threshold, determining that the sampling signal is saturated; In the case where the first sub-target saturation level is greater than the target threshold and the second sub-target saturation level is greater than the target threshold, it is determined that the sampling signal is not saturated.

7. The detection method of the inverter system according to any one of claims 1 to 6, characterized in that: The sampling signal further includes: an inductor electrical signal of the inverter system, and determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal includes: Determining the saturation state of the inductor electrical signal based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system; The determining the saturation state of the inductor electrical signal based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system includes: Obtaining a target current ripple based on the first actual value of the inductor electrical signal, or the first actual value of the inductor electrical signal, an input voltage of the inverter system, and a switching frequency of a switch tube in the inverter system; Based on the inductor electrical signal and the inductor current sensitivity information, a target ripple threshold is obtained; the inductor current sensitivity information is determined based on a ratio of a maximum value corresponding to a current ripple range of the inductor electrical signal to the first actual value of the inductor electrical signal; Determining the saturation state of the inductor electrical signal based on the target current ripple and the target ripple threshold; The determining the saturation state of the inductor electrical signal based on the target current ripple and the target ripple threshold comprises: When the target current ripple is not less than the target ripple threshold, determining that the inductor electrical signal is saturated; When the target current ripple is less than the target ripple threshold, it is determined that the inductor electrical signal is not saturated.

8. The detection method of the inverter system according to claim 7, characterized in that: The first actual value based on the inductor electrical signal, or the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, includes: Acquire a maximum inductor current value and a minimum inductor current value in the first actual values ​​of the inductor electrical signals within a target period; Obtaining a target current ripple based on the maximum inductor current value and the minimum inductor current value; The target current ripple is determined based on the following formula: in, is the target current ripple; is the maximum inductor current value; is the minimum inductor current value.

9. The detection method of the inverter system according to claim 7, characterized in that: The first actual value based on the inductor electrical signal, or the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system, includes: Obtaining the target current ripple based on the first actual value of the inductor electrical signal, the input voltage of the inverter system, and the switching frequency of the switch tube in the inverter system; The target current ripple is determined based on the following formula: in, is the target current ripple; is the first actual value of the inductor electrical signal; is the input voltage of the inverter system; is the switching frequency of the switch tube.

10. The detection method of the inverter system according to any one of claims 1 to 6, characterized in that: The determining the saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal comprises: Performing data transformation on the first actual value to obtain target transformation data; the data transformation includes: fast Fourier transform and wavelet transform; Performing algorithmic analysis on the target transformation data to obtain an algorithmic analysis result; the algorithm corresponding to the algorithmic analysis is an algorithm capable of obtaining the saturation state of the sampling signal; the algorithmic analysis result is a result obtained by performing algorithmic analysis on the target transformation data and capable of characterizing the saturation state of the sampling signal; Based on the algorithm analysis result, the saturation state of the sampling signal is determined.

11. The detection method of the inverter system according to claim 10, characterized in that: The performing algorithm analysis on the target transformation data to obtain an algorithm analysis result includes: Grouping the target transformation data to obtain at least one target data group; Calculate statistical information corresponding to each of the target data groups; the statistical information is a mean value corresponding to the target data group and a maximum value corresponding to the target data group; Based on the statistical information, determining weight information of each of the target data groups; Based on the weight information and each of the target data groups, an algorithm analysis is performed to obtain the algorithm analysis result.

12. The detection method of the inverter system according to claim 10, characterized in that: The determining the saturation state of the sampling signal based on the algorithm analysis result includes: Based on the algorithm analysis result, determining the spectrum characteristics; the spectrum characteristics include: spectrum diffusion and spectrum non-diffusion; The saturation state of the sampled signal is determined based on the frequency spectrum feature.

13. The detection method of the inverter system according to claim 12, characterized in that: The determining the saturation state of the sampled signal based on the frequency spectrum feature comprises: Based on the frequency spectrum characteristics, determining an arc state; the arc state includes: an arc is generated or an arc is not generated; Based on the arc state, the saturation state of the sampling signal is determined.

14. The detection method of the inverter system according to any one of claims 1 to 6, characterized in that: The performing arc detection based on the saturation state comprises: When the saturation state is saturated, desaturation processing is performed on the sampling signal to obtain an unsaturated sampling signal; Arc detection is performed based on the unsaturated sampling signal.

15. The detection method of the inverter system according to claim 14, characterized in that: The desaturating the sampled signal to obtain an unsaturated sampled signal includes: By adjusting at least one of the input voltage of the inverter system, the input current of the inverter system, the bus voltage of the inverter system and the switching frequency of the switch tube in the inverter system, the sampling signal is desaturated to obtain the unsaturated sampling signal.

16. The detection method of the inverter system according to claim 15, characterized in that: The method comprises: performing desaturation processing on the sampling signal by adjusting the bus voltage of the inverter system to obtain the unsaturated sampling signal, including: Adjust at least one of the bus voltage corresponding to the inverter system, the bus voltage corresponding to the battery pack electrically connected to the inverter, and the bus voltage corresponding to the charging pile electrically connected to the inverter, desaturate the sampling signal, and obtain the unsaturated sampling signal.

17. A detection device for an inverter system, characterized in that: The inverter system is connected to the arc detection system; the device comprises: A first processing module is used to obtain a first actual value of a sampling signal obtained by the arc detection system sampling the inverter system; the sampling signal is an input electrical signal of the inverter system; and the first actual value is an actual value corresponding to the sampling signal; A second processing module is configured to determine a saturation state of the sampling signal based on at least one of the first actual value, the maximum amplitude corresponding to the sampling signal, and the minimum amplitude corresponding to the sampling signal; the saturation state includes: saturation or unsaturation; the maximum amplitude is an upper amplitude limit for determining whether the sampling signal is saturated; the minimum amplitude is a lower amplitude limit for determining whether the sampling signal is saturated; A third processing module, configured to perform arc detection based on the saturation state; The third processing module is also used for: When the saturation state is saturated, desaturation processing is performed on the sampling signal by adjusting at least one of an input voltage of the inverter system, an input current of the inverter system, a bus voltage of the inverter system, and a switching frequency of a switch tube in the inverter system; The second processing module is also used for: Obtaining a target saturation level of the sampled signal based on at least one of the first actual value, the maximum amplitude, and the minimum amplitude; Based on the maximum amplitude, the minimum amplitude and the sensitivity information, a target threshold is obtained; the sensitivity information is determined based on the correlation between the target saturation level of the inverter system and the accuracy of the arc detection result; based on experimental tests, the influence of the inverter system on the arc detection result at different target saturation levels is evaluated, and the specific value of the sensitivity information is determined based on the influence level; Determining the saturation state of the sampled signal based on the target saturation level and the target threshold, or the first actual value and the target threshold; The second processing module is also used for: Obtaining the target saturation level based on the first actual value, the maximum amplitude, and the minimum amplitude; The target saturation level is determined based on the following formula: in, is the target saturation level; is the first actual value; is the minimum amplitude, is the maximum value; or, Obtaining the maximum value and the minimum value of the first actual value of each of the sampling signals within a target period; Based on the maximum value and the minimum value, the target saturation level is obtained; the target saturation level is determined based on the following formula: in, is the target saturation level; is the minimum value; is the maximum value; or, Based on the first actual value and the maximum amplitude, obtaining a first sub-goal saturation degree; Based on the first actual value and the minimum amplitude, obtaining a second sub-target saturation degree; Based on the first sub-target saturation degree and the second sub-target saturation degree, obtaining the target saturation degree; The saturation level of the first sub-goal is determined based on the following formula: in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value; The second sub-goal saturation level is determined based on the following formula: in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude; or, The saturation level of the first sub-goal is determined based on the following formula: in, is the saturation level of the first sub-goal; is the first actual value; is the maximum value; The second sub-goal saturation level is determined based on the following formula: in, is the saturation level of the second sub-goal; is the first actual value; is the minimum amplitude.

18. An inverter system, characterized in that: The inverter system is detected based on the detection method of the inverter system according to any one of claims 1 to 16.

19. The inverter system according to claim 18, characterized in that: The inverter system is used to be electrically connected to at least one of a battery pack and a charging pile.

20. An arc detection system based on the detection method of the inverter system according to any one of claims 1 to 16, characterized in that: include: Sampling module; The signal processing module is electrically connected to the signal processing module.

21. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the detection method of the inverter system as described in any one of claims 1 to 16 is implemented.

22. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the detection method of the inverter system according to any one of claims 1 to 16 is implemented.

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