Fault detection system of power electronic system and detection method thereof

Abstract

The invention provides a fault detection system of a power electronic system, and relates to the technical field of electronic system fault detection, the fault detection system comprises a power system and a monitoring system, the power system comprises a plurality of electronic systems and supports current to flow in the plurality of electronic systems, the plurality of electronic systems are arranged in parallel, the monitoring module is arranged among the plurality of electronic systems, and the monitoring module is connected with the power system. Monitoring the speed of the current passing through the electronic system, and determining whether the target electronic system is in a fault state; the positioning module is used for determining the position of the electronic system in the power system and determining a fault area in the electronic system after the monitoring system obtains the position of the fault electronic system; the model construction module is used for constructing a model belonging to the whole power system on the terminal according to the position of the electronic system in the power system; the technical key points are as follows: each electronic system is monitored by means of a monitoring system in a power system, and the electronic system is reflected in the monitoring system through a sensor, so that the investment is small, and the positioning is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic system fault detection, and particularly to a fault detection system and a detection method for a power electronic system. Background Art

[0002] The power system is an integrated whole composed of power generation, power supply (power transmission, transformation, and distribution), power consumption facilities, and secondary facilities such as regulation and control, relay protection, safety automation devices, metering devices, dispatching automation, and power communication required to ensure its normal operation. It consists of power plants, transmission and transformation lines, power supply and distribution substations, and power consumption to form a power production and consumption system. Its function is to convert primary energy in nature into electrical energy through power generation power devices, and then supply the electrical energy to each user through power transmission, transformation, and distribution.

[0003] The main structure of the power system includes power sources (power plants such as hydropower plants, thermal power plants, and nuclear power plants), substations (step-up substations, load center substations, etc.), power transmission and distribution lines, and load centers. Each power source point is also interconnected to achieve power exchange and regulation between different regions, thereby improving the safety and economy of power supply. The network composed of transmission lines and substations is usually called the power grid. The information and control system of the power system consists of various detection devices, communication devices, safety protection devices, automatic control devices, and monitoring automation and dispatching automation systems.

[0004] As a small part of the power system, an electronic system is usually composed of electronic components or parts and can generate, transmit, collect, or process electrical signals and information. Electronic systems are divided into analog, digital, or hybrid electronic systems that combine both. No matter which form of electronic system, they are all electronic devices that can complete a certain task. Generally, those with a small scale and single function are called unit circuits; while those with complex functions and composed of several unit circuits (function blocks) and a relatively large scale are called electronic systems. Usually, an electronic system consists of three main parts: input, output, and information processing, and is used to process certain information, control, or drive a certain load.

[0005] A patent document with the publication number CN114429171B, a method for detecting faults in an industrial system and an electronic device, detects the fault data of faulty sensors one by one through multiple base classifiers, and then identifies the fault modes of the industrial system. The embodiments of the present invention achieve accurate positioning of faulty sensors in an industrial system with numerous sensors and obtain the fault modes of the industrial system.

[0006] The patent document with the publication number CN106918760A, a method and device for fault detection in a power electronic system, establishes a fast inverter sub-model and a slow control sub-model through a closed-loop control simulation example model of a three-phase two-level inverter, and then obtains the state space equation through modeling. Since the established model can simulate the power system, after obtaining the original signals of the power electronic system, it can be determined whether there is a fault in the power electronic system through the established model, thus realizing the real-time detection of faults in the power electronic system.

[0007] The patent document with the publication number CN111488947B, a method and device for fault detection of power system equipment, obtains the power fingerprint data, voiceprint data, temperature data and vibration data of the power system equipment. First, it determines the working mode of the power system equipment according to the power fingerprint data, and then based on the voiceprint data, temperature data and vibration data, it performs fault detection on the power system equipment according to the pre-trained fault detection model for this working mode. It conducts differential fault detection according to the working characteristics of the power system equipment in various working modes, thereby improving the accuracy of fault detection of power system equipment.

[0008] However, in the process of implementing the above technical solutions, the following technical problems are found in the above technical solutions:

[0009] The method and device for fault detection of power system equipment (publication number: CN111488947B) uses the power fingerprint data, voiceprint data, temperature data and vibration data of the power system equipment to perform fault detection on the power system equipment. However, in the actual application process, the method of obtaining the power system equipment, power fingerprint data, voiceprint data, temperature data and vibration data is not conducive to covering multiple power systems in the power system;

[0010] The method and device for fault detection in a power electronic system (publication number: CN106918760A) establish a fast inverter sub-model and a slow control sub-model through a closed-loop control simulation example model of a three-phase two-level inverter, and then obtain the state space equation through modeling to simulate the power system to determine whether there is a fault in the power electronic system. However, in the actual application process, it is limited by numerous electronic systems and is not conducive to forming a model that is not affected by multiple electronic systems in a certain area;

[0011] The method for fault detection in an industrial system and an electronic device (publication number: CN114429171 B) detect the fault data of a faulty sensor one by one through multiple base classifiers to determine the fault location and fault mode. However, in the actual application process, if it is necessary to determine the location where the system fault occurs, using the positioning method of the faulty sensor is likely to make it difficult to obtain fault data because the electronic system is in a fault state while the sensor has not failed;

[0012] In summary, the fault detection methods in existing power electronic systems are limited by the large scale of the power system, which contains a large number of electronic systems. It is difficult to determine the local fault states of electronic systems within a large range of the power system at the lowest cost. Summary of the Invention

[0013] To overcome the deficiencies of the prior art, the embodiments of the present application provide a fault detection system and a detection method for a power electronic system. By using monitoring modules arranged in the power system to monitor multiple electronic systems in a parallel state, the speeds at which the current in the power system flows through the multiple electronic systems are monitored. When there is a large deviation between the change in the speed at which the current flows through an electronic system and the change in the current speed under normal conditions, it can be determined whether the target electronic system is faulty. At the same time, information on whether each sensor arranged in the electronic system is abnormal is displayed on a display. According to the sensor numbers displayed on the display, the location where the fault occurs in the faulty electronic system can be determined, achieving the technical effects of low input and precise positioning.

[0014] Based on the above technical effects, when the monitoring module monitors multiple electronic systems, it is necessary to calculate the speed at which the current flows, refer to the mean values of multiple groups of current flow rates under normal conditions and the deviation values of the mean current flow rates, and set a normal threshold range for the current flow rate. When the calculated current speed exceeds this threshold range, it can be determined that the target electronic system is in a faulty state. The model construction module can display the numbers of the corresponding sensors on the display based on the markings of the sensors by the labeling unit on the positioning module, and determine the location where the electronic system has a fault.

[0015] Moreover, if the current speed in the corresponding electronic system does not exceed the set threshold range, it can be reversely proved that the sensor itself has a fault, which is conducive to reverse verification.

[0016] The technical solutions adopted by the embodiments of the present application to solve its technical problems are as follows:

[0017] A fault detection system and a detection method for a power electronic system, including a power system and a monitoring system. The power system includes multiple electronic systems and supports the flow of current through the multiple electronic systems;

[0018] The monitoring system is connected to the power system and monitors the multiple electronic systems;

[0019] The monitoring system includes a monitoring module, a positioning module, and a model construction module;

[0020] Among them, the multiple electronic systems are arranged in parallel. The monitoring module is arranged between the multiple electronic systems to monitor the speed at which the current passes through the electronic systems and determine whether the target electronic system is in a faulty state;

[0021] The positioning module is used to determine the position of the electronic system in the power system, and after the monitoring system obtains the position of the faulty electronic system, determine the faulty area within the electronic system;

[0022] The model construction module is used to construct a model of the entire power system on the terminal according to the position of the electronic system in the power system, and simulate the real-time state of each electronic system in the power system working on the terminal.

[0023] In a possible implementation manner, the model construction module includes a signal receiver, a processor, a feedback unit, a signal transmitter and a display, and the signal transmitter is arranged inside the electronic system;

[0024] Among them, the signal transmitter is used to output in real time the signal through which the current flows in the electronic system inside the electronic system; the signal receiver receives inside the model construction module the signal through which the current flows in the electronic system; the feedback unit is used to transmit the signal through which the current flows in the electronic system to the processor, and the processor displays on the display the state of the current flowing through the electronic system.

[0025] In a possible implementation manner, the display shows the state of the current flowing through each electronic system, which can be represented as the frequency of the signal transmitter working in the corresponding electronic system through which the current flows, that is, the average speed at which electrons move along the signal transmitter under the action of the electric field per unit time.

[0026] In a possible implementation manner, the positioning module includes a sensor unit and a labeling unit, and the labeling unit labels the sensor unit, so that the positioning module of the corresponding electronic system can inform the faulty position in a digital display manner in the model construction module, that is, when the faulty state of the electronic system is displayed on the display, the sensor position is displayed in digital form to indicate the position where the fault is located.

[0027] A fault detection method for a power electronic system includes:

[0028] S1: The monitoring module judges whether the current flow rate deviates from the threshold interval in the form of a reference set current flow rate fluctuation threshold interval;

[0029] S2: In the case where the current flow rate fluctuates between the threshold regions, determine the target electronic system and display the state based on the simulation model constructed by the model construction module;

[0030] S3: The target electronic system continuously emits signals through the signal transmitter. After the signals are received by the signal receiver and processed by the feedback unit and the processor, the working frequency of the current in the electronic system is displayed on the display.

[0031] S4: Based on the labeling of the sensor unit by the labeling unit in the target electronic system, determine the corresponding labeled sensor in the faulty electronic system, and display it on the display screen in a digital display manner, so as to determine the fault location according to the position where the sensor is installed.

[0032] In a possible implementation, the speed at which the current flows through the electronic system in S1 is the drift speed of electrons, and its calculation formula is:

[0033]

[0034] Where, V d is the drift speed of electrons, I is the current, n is the density of free electrons in the conductor, and Ae is the cross-sectional area of the conductor; when calculating the speed at which the current flows through the electronic system using this formula, nAe is regarded as the entire electronic system, as a constant quantity that does not change under normal conditions, and the current flowing in the power system is also a constant quantity based on the application standard.

[0035] In a possible implementation, the setting of the current flow rate fluctuation threshold in S1 is denoted as V, and the average value of the speed at which the current flows through the electronic system over a period of time is denoted as μ, and its calculation formula is:

[0036]

[0037] Based on the above average value μ, calculate, through the following calculation formula, the reasonable deviation range σ of the current speed on the basis of the average current speed:

[0038]

[0039] Then, referring to the absolute value σ, when the electronic system is operating in the power system, the current flow rate fluctuation threshold V = μ + / - σ can be set, and if V d is greater than μ + σ or less than μ - σ, then the target electronic system is in a faulty state;

[0040] Where, N is the total number of data participating in data statistics over a period of time, I i is the i-th current data point, V d is the speed at which the current flows through the electronic system obtained by the monitoring module at a certain time node under normal conditions.

[0041] In a possible implementation, the simulation model constructed by the model construction module in S2 is a plane framework built on the terminal. The overall framework is a power system, and the electronic system is a component of the plane framework. When it is operating in the power system, it remains in a continuous operation state, and with the help of signal transmitters and signal receivers, the working state of the electronic system is displayed on the framework.

[0042] In a possible implementation, the signal transmitter is connected in series to the corresponding electronic system. When transmitting a signal, the signal receiver receives the signal belonging to the current flow rate and displays it on the plane frame of the current flow rate state supported on the electronic system.

[0043] In a possible implementation, when the signal transmitted by the signal transmitter is received by the signal receiver, it is first fed back by the feedback unit. When it is determined that the current flow rate in the electronic system exceeds the set flow rate threshold, the sensor unit in the positioning module transmits a signal through the line, and based on the label of the sensor by the labeling unit, the number of the corresponding sensor is displayed on the display, so as to determine the location where the electronic system fails according to the location where the sensor is installed.

[0044] The beneficial effects of this application are as follows:

[0045] First, in this solution, by using the monitoring module arranged in the power system to monitor multiple electronic systems in a parallel state to monitor the speeds at which the current in the power system flows through multiple electronic systems respectively. When the change in the speed at which the current flows through the electronic system shows a large deviation from the change in the normal current speed, it can be determined whether the target electronic system is faulty. At the same time, with the help of the information on whether each sensor arranged in the electronic system is abnormal being displayed on the display, according to the sensor number displayed on the display, the location where the fault occurs in the faulty electronic system can be determined, with a small investment and accurate positioning.

[0046] Second, in this solution, when the monitoring module monitors multiple electronic systems, by calculating the speed at which the current flows, referring to the mean value of multiple groups of current flow rates and the deviation value from the mean current flow rate under normal conditions, a normal threshold range is set for the current flow rate. When the calculated current speed exceeds this threshold range, it can be determined that the target electronic system is in a faulty state.

[0047] Third, in this solution, when the target electronic system is in a faulty state, the model construction module, based on the label of the sensor by the labeling unit on the positioning module, displays the number of the corresponding sensor on the display, and the location where the electronic system fails can be determined, which is relatively intuitive. At the same time, if the current speed in the corresponding electronic system does not exceed the set threshold range, it can be reversely proved that the sensor itself has failed. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a system block diagram of the fault detection system of the power electronic system of the present invention in the usage state;

[0049] Figure 2 It is a schematic structural diagram of the fault detection system of the power electronic system of the present invention for monitoring the flow of current in multiple electronic systems;

[0050] Figure 3 System block diagram of the connection between the fault detection system model construction module of the power electronic system of the present invention and the electronic system;

[0051] Figure 4 Schematic diagram of the diagonal brace structure of the system block diagram of the fault detection system positioning module of the power electronic system of the present invention;

[0052] Figure 5 Schematic diagram of the working process of the fault detection system of the power electronic system of the present invention;

[0053] Figure 6 Schematic diagram of the model construction of the power electronic system in the fault detection system of the power electronic system of the present invention;

[0054] Figure 7 Schematic diagram of the fault detection method of the power electronic system of the present invention;

[0055] Figure 8 Schematic diagram of the normal range of current speed change in the fault detection method of the power electronic system of the present invention. Detailed implementation manners

[0056] The technical solutions in the embodiments of the present application are to solve the problems in the above background technology, and the general idea is as follows:

[0057] By using the monitoring module arranged in the power system to monitor multiple electronic systems in a parallel state, so as to monitor the speeds at which the current in the power system flows through the multiple electronic systems respectively. When the change in the speed at which the current flows through the electronic system shows a large deviation from the change in the current speed in the normal state, it can be determined whether the target electronic system is faulty. At the same time, with the help of whether each sensor arranged in the electronic system is abnormal, the information is displayed on the display, and according to the sensor number displayed on the display, the location where the fault occurs in the faulty electronic system is determined. The specific implementation manner is as follows:

[0058] Embodiment 1:

[0059] This embodiment introduces the specific structure of a fault detection system and its detection method for a power electronic system, specifically referring to Figures 1 - 6 as shown, including a power system and a monitoring system. The power system includes multiple electronic systems (the multiple electronic systems are arranged in parallel), and the monitoring system includes a monitoring module, a positioning module, and a model construction module. The positioning module includes a sensor unit and a labeling unit;

[0060] Among them, the power system supports the flow of current in multiple electronic systems (this is the current working state of the power system and the electronic systems. When the current flows in the power system, it will be transmitted to each electronic system through the circuit to support the normal operation of each device, instrument, etc.);

[0061] The monitoring system is connected to the power system and monitors multiple electronic systems. Specifically, the monitoring modules in the monitoring system are arranged between multiple electronic systems (this is to use a terminal system applied to the power system to monitor several electronic systems, and the electronic systems are regarded as a whole at this time, which is conducive to actual monitoring).

[0062] Secondly, the positioning module is used to determine the position of the electronic system in the power system and, after the monitoring system obtains the position of the faulty electronic system, determine the faulty area within the electronic system.

[0063] Among them, the sensor unit in the positioning module includes more than a dozen or even dozens of sensors such as temperature sensors and smoke sensors. When obtaining the real-time data of multiple sensors, if the sensor data is abnormal, the working state of the electronic system can be directly obtained, without being restricted by the method of positioning faulty sensors in the comparative document (CN114429171B) (if the sensors in this technology do not fail, it is difficult to judge the abnormal operation of the electronic system), which is convenient for monitoring the speed of the current passing through the electronic system and determining whether the target electronic system is in a faulty state.

[0064] Furthermore, the labeling unit labels the sensor unit, so that the positioning module of the corresponding electronic system can inform the faulty position in a digital display manner in the model construction module. That is, when the electronic system shown on the display is in a faulty state, the position of the sensor is displayed in numbers to indicate the location of the fault. When the staff observes the location of the fault in the electronic system on the terminal model, the location where the fault occurs can be determined through the sensor number (the numbers of each sensor do not overlap, and multiple sensors with the same function, such as temperature sensors, are provided).

[0065] Such as Figure 3 shown, the model construction module includes a signal receiver, a processor, a feedback unit, a signal transmitter and a display, and the signal transmitter is arranged inside the electronic system.

[0066] Among them, the signal transmitter is used to output in real time the signal of the current flowing through the electronic system inside the electronic system, and the signal of the current flowing through the electronic system output is received by the signal receiver in the model construction module.

[0067] Under normal conditions, when the signal receiver receives the signal through which the current flows in the electronic system, it first pre-processes the signal through which the current flows in the electronic system by means of a feedback unit, confirms whether the data obtained by the sensor in the positioning module is abnormal, and then transmits it to the processor. The processor displays the state of the current flowing through the electronic system on the display. When the display shows the state of the current flowing through each electronic system, it is mainly represented by the frequency at which the signal transmitter in the corresponding electronic system works (the average speed at which electrons move along the signal transmitter under the action of an electric field per unit time), which can support the model construction module to construct a model of the entire power system on the terminal according to the position of the electronic system in the power system, and simulate the real-time state of each electronic system working in the power system on the terminal.

[0068] The above design monitors multiple electronic systems in a parallel state by using the monitoring module arranged in the power system, so as to monitor the speed at which the current in the power system flows through multiple electronic systems respectively (that is, the average speed at which electrons move along the conductor under the action of an electric field, where the conductor is regarded as an entire electronic system). When the change in the speed at which the current flows through the electronic system shows a large deviation from the change in the normal current speed, it can be determined whether the target electronic system is faulty.

[0069] On the above premise, each sensor arranged in the electronic system sends signals to the signal receiver in the model construction module through the signal transmitter, and after being processed by the feedback unit and the processor, it is displayed on the display (this is the terminal that can be observed manually). By means of the sensor number displayed on the display, the location where the fault occurs in the faulty electronic system can be determined. By using the monitoring system in the power system to monitor each electronic system, the electronic system reflects in the monitoring system through the sensor, with a small investment and accurate positioning.

[0070] Embodiment 2:

[0071] Based on Embodiment 1, as Figure 7 and Figure 7 shown, this embodiment introduces a fault detection method for a power electronic system, including:

[0072] S1: The monitoring module determines whether the current flow rate deviates from the threshold interval in the form of a reference-set current flow rate fluctuation threshold interval;

[0073] Among them, the speed at which the current flows through the electronic system is the drift speed of electrons, that is, (that is, the average speed at which electrons move along the conductor under the action of an electric field, where the conductor is regarded as an entire electronic system), and its calculation formula is:

[0074]

[0075] Among them, V dis the drift velocity of electrons, I is the current, n is the density of free electrons in the conductor, and Ae is the cross-sectional area of the conductor;

[0076] When calculating the velocity of current flowing through the electronic system using this formula, nAe is regarded as the entire electronic system, which is a constant quantity under normal conditions. And the current I flowing in the power system is also a constant quantity based on the application standard. By dividing the constant current I by the entire electronic system nAe, the velocity V of the current flowing through the electronic system can be obtained. d (This is the velocity of the current flowing through the electronic system in real-time.)

[0077] Secondly, in order to provide a reference standard for the velocity V of the current flowing through the electronic system d a threshold is set for the current flow velocity fluctuation and denoted as V;

[0078] At this time, it is necessary to first calculate the average value of the velocity of the current flowing through the electronic system over a period of time and denote it as μ. Its calculation formula is:

[0079]

[0080] Based on the above average value μ, the reasonable deviation range σ is calculated through the following calculation formula. The calculation formula of σ is as follows:

[0081]

[0082] where N is the total number of data participating in data statistics over a period of time, I i is the i-th current data point, V d is the velocity of the current flowing through the electronic system obtained by the monitoring module at a certain time node under normal conditions

[0083] Then, after obtaining the reasonable deviation range σ, referring to the absolute value σ, when the electronic system is working in the power system, the current flow velocity fluctuation threshold V = μ + / - σ can be set. As Figure 8 shown, if V d is greater than μ + σ or less than μ - σ (that is, when deviating from the region between μ + σ and μ - σ), the target electronic system can be judged to be in a fault state;

[0084] S2: When the current flow velocity fluctuation is within the range beyond the threshold area, determine the target electronic system and display the state based on the simulation model constructed by the model construction module;

[0085] Among them, under normal conditions, if the current flow velocity fluctuation is within the threshold area, both the monitoring system and the electronic system operate in a normal state;

[0086] Secondly, the simulation model constructed by the model construction module is a planar framework built on the terminal. The overall framework is a power system, and the electronic system is an integral part of the planar framework. When the power system is operating, the electronic system remains in a continuous operation state and, with the help of signal transmitters and signal receivers, displays its working state on the framework.

[0087] S3: The target electronic system continuously emits signals through the signal transmitter. After the signals are received by the signal receiver and processed by the feedback unit and the processor, the working frequency of the current in the electronic system is displayed on the monitor.

[0088] Among them, the signal transmitter corresponding to the target electronic system is serially arranged with it. When emitting signals, the signal receiver receives the signals belonging to the current flow rate and supports the display of the current flow rate state on the planar framework of the electronic system.

[0089] S4: According to the label of the sensor unit in the target electronic system by the labeling unit, the sensor with the corresponding label is determined in the faulty electronic system and displayed on the display screen in a digital display manner, so as to determine the fault location according to the position where the sensor is installed.

[0090] Among them, when the signals emitted by the signal transmitter are received by the signal receiver, they are first fed back by the feedback unit. When it is determined that the current flow rate in the electronic system exceeds the set flow rate threshold, the sensor unit in the positioning module transmits signals through the line, and based on the label of the sensor by the labeling unit, the number of the corresponding sensor is displayed on the monitor, so as to determine the location where the electronic system fails according to the position where the sensor is installed. For the staff observing on the monitor (terminal), it is relatively intuitive.

[0091] Through the above design, when the monitoring module monitors multiple electronic systems, the speed of the current flowing through is calculated, and by referring to the average value of the current flow rates in multiple groups under normal conditions and the deviation value from the average current flow rate, a normal threshold range is set for the current flow rate. When the calculated current speed exceeds this threshold range, it can be determined that the target electronic system is in a faulty state;

[0092] Immediately afterwards, the signal transmitter that continuously emits signals transmits relevant signals to the signal receiver, which is fed back by the feedback unit. When it is determined that the current flow rate in the electronic system exceeds the set flow rate threshold, based on the label of the sensor by the labeling unit, the number of the corresponding sensor is displayed on the monitor, so as to determine the location where the electronic system fails according to the position where the sensor is installed, which is relatively intuitive.

[0093] It should be noted that if the number of the corresponding sensor is displayed on the monitor while the current speed in the corresponding electronic system does not exceed the set threshold range, it can be reversely proved that the sensor itself has failed.

[0094] Finally, it should be noted that: Obviously, the above embodiments are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A fault detection system for a power electronics system, characterized in that, Comprising: A power system, which includes multiple electronic systems and supports the flow of current in the multiple electronic systems; A monitoring system, which is connected to the power system and monitors the multiple electronic systems; The monitoring system includes a monitoring module, a positioning module, and a model construction module; Among them, the multiple electronic systems are arranged in parallel, the monitoring module is arranged between the multiple electronic systems to monitor the speed of the current passing through the electronic systems and determine whether the target electronic system is in a fault state; The positioning module is used to determine the position of the electronic system in the power system, and after the monitoring system obtains the position of the faulty electronic system, determine the fault area within the electronic system; The model construction module is used to construct a model of the entire power system on the terminal according to the position of the electronic system in the power system, and simulate the real-time state of each electronic system in the power system on the terminal.

2. The fault detection system of a power electronic system according to claim 1, characterized in that: The model construction module includes a signal receiver, a processor, a feedback unit, a signal transmitter, and a display. The signal transmitter is arranged inside the electronic system; Among them, the signal transmitter is used to output in real time the signal of the current flowing through the electronic system inside the electronic system; The signal receiver receives the signal of the current flowing through the electronic system inside the model construction module; The feedback unit is used to transmit the signal of the current flowing through the electronic system to the processor, and the processor displays the state of the current flowing through the electronic system on the display.

3. The fault detection system of a power electronic system according to claim 2, characterized in that: The display shows the state of the current flowing through each electronic system, which can be represented as the frequency of the signal transmitter working in the corresponding electronic system when the current flows through, that is, the average speed of electrons moving along the signal transmitter under the action of an electric field per unit time.

4. The fault detection system of a power electronics system according to claim 1, characterized in that: The positioning module includes a sensor unit and a labeling unit. The labeling unit labels the sensor unit so that the positioning module of the corresponding electronic system can inform the fault location in a digital display manner in the model construction module. That is, when the electronic system shown on the display is in a fault state, the sensor position is displayed digitally to indicate the location of the fault.

5. A fault detection method for a power electronic system, which is implemented by using the fault detection system of the power electronic system according to any one of claims 1 to 4, characterized in that, Comprising: S1: The monitoring module determines whether the current flow rate deviates from the threshold range in the form of referring to the set current flow rate fluctuation threshold range; S2: In the case where the current flow rate fluctuates between the threshold regions, determine the target electronic system and display the state based on the simulation model constructed by the model construction module; S3: The target electronic system continuously emits signals through the signal transmitter. After the signals are received by the signal receiver and processed by the feedback unit and the processor, the working frequency of the current in the electronic system is displayed on the display; S4: According to the label of the sensor unit in the target electronic system by the labeling unit, determine the sensor with the corresponding label in the faulty electronic system and display it on the display screen in a digital display manner, so as to determine the fault location according to the position where the sensor is installed.

6. The fault detection method of a power electronic system according to claim 5, characterized in that: In S1, the speed of the current flowing through the electronic system is the drift speed of electrons, and its calculation formula is: Among them, V d is the drift velocity of electrons, I is the current, n is the density of the number of free electrons in the conductor, and Ae is the cross-sectional area of the conductor; When calculating the speed of the current flowing through the electronic system by this formula, nAe is regarded as the entire electronic system, which is a constant quantity under normal conditions, and the current flowing in the power system is also a constant quantity based on the application standard.

7. The fault detection method of a power electronic system according to claim 6, characterized in that: The setting of the current flow rate fluctuation threshold in S1 is denoted as V, and the average value of the speed of the current flowing through the electronic system over a period of time is denoted as μ, and its calculation formula is: Based on the above average value μ, the reasonable deviation range σ is calculated through the following calculation formula on the basis of the average current speed: Then, referring to the absolute value σ, when the electronic system operates in the power system, the current flow rate fluctuation threshold V = μ + / - σ can be set, and if V d is greater than μ + σ or less than μ - σ, then the target electronic system is in a fault state; Among them, N is the total number of data participating in data statistics within a period of time, and I i is the i-th current data point, and V d is the speed at which the current flows through the electronic system obtained by the monitoring module at a certain time node under normal conditions.

8. The fault detection method of a power electronic system according to claim 6, characterized in that: The simulation model constructed by the model construction module in S2 is a plane framework built on the terminal. The overall framework is a power system, and the electronic system is a part of the plane framework. When the power system is working, it remains in a continuous operation state, and with the help of a signal transmitter and a signal receiver, the working state of the electronic system is displayed on the framework.

9. The fault detection method of a power electronics system according to claim 8, characterized in that: The signal transmitter is connected in series to the corresponding electronic system, and when transmitting a signal, the signal receiver receives the signal belonging to the current flow rate and supports the display of the current flow rate state on the plane framework of the electronic system.

10. The fault detection method of a power electronic system according to claim 6, characterized in that: When the signal transmitted by the signal transmitter is received by the signal receiver, it is first fed back by the feedback unit. When it is determined that the current flow rate in the electronic system exceeds the set flow rate threshold, the sensor unit in the positioning module transmits a signal through the line, and based on the label of the sensor by the labeling unit, the number of the corresponding sensor is displayed on the display to determine the location where the electronic system fails according to the location where the sensor is installed.

Images