KR102302565B1 - Abnormality detecting system of wireless power feeding lines and abnormality detecting method using the system - Google Patents

Abstract

The present invention relates to a system and method for detecting an abnormality in a wireless power feeding line, and more particularly, by using an existing sensor installed in an inverter constituting a wireless power feeding system for a railway vehicle to detect an abnormality in the power feeding line at an initial stage. Disclosed are a system and method for detecting anomalies in a wireless power supply line that can reduce the risk of an accident in a wireless power supply system by allowing the current to be cut off quickly.

Description

Abnormality detecting system of wireless power feeding lines and abnormality detecting method using the system

The present invention relates to a system and method for detecting an abnormality in a wireless power feeding line, and more particularly, by using an existing sensor installed in an inverter constituting a wireless power feeding system for a railway vehicle to detect an abnormality in the power feeding line at an initial stage. Disclosed are a system and method for detecting abnormalities in a wireless power supply line that can reduce the risk of an accident in a wireless power supply system by allowing the current to be cut off quickly.

A wireless power supply system for railroad vehicles provides power to the railroad car by inducing a magnetic field in a resonance method with an air gap of a certain size between the current collector provided to the railroad car and the power feeder provided on the track. As shown in FIG. 1, it means a system that supplies

Among them, the inverter generates a high-frequency current of several tens of kHz and sends it to the feed line, and the feed line generates a high-frequency magnetic field according to the shape of the line to receive power from the current collector.

In general, a resonance capacitor is connected to a power supply line of a wireless power supply system to resonate with an output frequency of an inverter. A capacitor is a lumped element that compensates for inductance that occurs structurally in a line, and the wireless feed line for railroad vehicles has a very long shape, high inductance and high withstand voltage due to current. Distributed and connected in the middle.

For example, as shown in FIG. 2 , resonance capacitors are connected to the 200 m long line at intervals of 20 m.

The resonant capacitor is the part that generates the most heat in the feed line. Although the surface area of the conductor through which the current passes is very large in the cable using the Litz wire with the minimized high-frequency resistance, the connection terminal between the cable and the resonant capacitor has a relatively small surface area, so heat is generated along with the bottleneck of the current. In addition, the capacitor itself generates heat due to dielectric loss along with conductor loss.

In general, high-frequency current of 60kHz, 300~500A flows in the wireless feed line, so high temperature may occur in the capacitor and the terminal part. There is a risk.

In addition, even if the terminal part is normal, if the capacitor is deformed due to continuous temperature rise due to prolonged use, high temperature may occur instantaneously, and even if this continues, there is a risk of fire.

Therefore, in order to prevent major accidents such as fire caused by abnormalities in the wireless feed line, safety technology that can detect a problem in the feed line immediately and cut off the current is essential.

In the past, the manager directly monitors the overheating condition of the power supply line in real time using infrared cameras or CCTV, or the detection method using a thermal wire. Since it must be used, there is a problem in that it costs a lot, and there is a high risk that the detection may not be performed properly due to an administrator's mistake.

In addition, the detection method using a heat-sensitive wire has the advantage of being able to quickly shut off the inverter when a high temperature occurs, but has a disadvantage in that economic efficiency is lowered because the overall system installation and maintenance costs are increased.

1. Republic of Korea Patent Publication No. 10-1037103 (Notice on May 26, 2011) 2. Republic of Korea Patent Publication No. 10-1379747 (2014. 04. 02. Announcement)

The present invention has been devised to solve the problems of the prior art as described above, and an object of the present invention is to detect an abnormality in the power supply line without additional equipment installation using the existing sensor constituting the wireless power supply system for railway vehicles. An object of the present invention is to provide a system and method for detecting an abnormality in a wireless feed line that can be detected at an early stage to quickly cut off the current.

Another object of the present invention is to provide a system and method for detecting an abnormality in a wireless power supply line capable of detecting abnormal occurrence of a power supply line even if the accuracy and communication resolution of the sensor are low.

The present invention for achieving the above objects,

A data receiver for receiving input and output voltage values and input and output current values measured from a voltage sensor and a current sensor provided in the wireless power inverter, and the data received by the data receiver to determine whether there is an abnormality in the feed line An arithmetic unit that calculates a determinant for It is characterized in that it is configured to include a control unit for determining whether to block.

에 의해 결정인자를 연산하는 것을 특징으로 한다.At this time, in the calculation unit

It is characterized in that the determinant is calculated by

In addition, when the output current of the inverter is greater than a preset threshold current in the comparison analysis unit and the determination factor calculated by the operation unit is greater than 0.95, it is determined that an abnormality has occurred in the feed line.

And, it characterized in that it is configured to further include an alarm signal generating unit for generating an alarm signal according to the determination result in the comparison analysis unit.

On the other hand, the abnormal detection method of the wireless feed line according to the present invention,

A data receiving step of receiving input and output voltage values and input and output current values measured from a voltage sensor and a current sensor provided in the wireless power inverter to a data receiving unit, and the data received in the data receiving step in the calculation unit A decision factor calculation step of calculating a decision factor for determining whether or not there is an abnormality in the feed line, and a decision factor comparison step of determining whether or not there is an abnormality in the feed line through comparative analysis of the decision factor calculated in the decision factor calculation step, and the decision factor When it is determined that there is an abnormality in the feed line in the comparison step, it is characterized in that it comprises a power cut-off step of cutting off the power output from the inverter through the control unit.

에 의해 결정인자를 계산하는 결정인자 계산단계를 포함하여 이루어진 것을 특징으로 한다.In this case, the determining factor calculation step includes a power calculation step of calculating the effective input and output power of the inverter using the input and output current values and input and output voltage values received in the data receiving step, respectively, and the power calculation step using the calculation results in

It is characterized in that it comprises a decision factor calculation step of calculating the decision factor by

In addition, in the determining factor comparison step, after checking whether the output current of the inverter exceeds a preset threshold current, it is checked whether the determining factor calculated in the determining factor calculating step exceeds 0.95.

According to the present invention, by using the input/output voltage and current measured by a typical sensor system for internal control of the inverter constituting the wireless power feeding system for railroad vehicles, an abnormality has occurred in the power supply line without additional equipment installation in the early stage in the operating system. It has an excellent effect of reducing the risk of an accident in the wireless power feeding system by detecting the current and allowing the current to be cut off quickly.

In addition, according to the present invention, even if the accuracy and communication resolution of the sensor is low, it is possible not only to detect the occurrence of an abnormality in the power supply line, but also to use the existing system as it is to serve as an additional safety device to the existing failure or abnormality detection method. Therefore, it has an additional effect of maximizing the effect of detecting abnormalities in the feed line.

1 is a diagram schematically showing the configuration of a wireless power supply system for a railroad vehicle.
FIG. 2 is a view showing a state in which a resonance capacitor is installed in a power supply line of the wireless power feeding system shown in FIG. 1;
3 is a diagram conceptually showing an abnormality detection system of a wireless feed line according to the present invention.
4 is a flowchart sequentially showing an abnormality detection method of a wireless feed line according to the present invention.
5 is a flowchart illustrating an abnormality detection algorithm used in the present invention shown in FIG.
Figure 6 (a) ~ (c) is a view showing log data in the case of a fire caused by the occurrence of a failure in the wireless feed line.
7 (a) and (b) are diagrams showing the results of predicting the failure time point when a problem occurs in the resonance capacitor using the determinant used in the present invention.

Hereinafter, preferred embodiments of a system and method for detecting an abnormality in a wireless feed line according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram conceptually showing an abnormality detection system of a wireless feed line according to the present invention, FIG. 4 is a flowchart sequentially illustrating an abnormality detection method of a wireless feed line according to the present invention, and FIG. It is a flowchart showing an abnormality detection algorithm used in the present invention, and FIGS. 6 (a) to (c) are diagrams showing log data when a fire occurs due to a failure of a wireless power supply line, and FIG. 7 (a) , (b) is a diagram showing the results of predicting the failure time point when a problem occurs in the resonance capacitor using the determinant used in the present invention.

The present invention reduces the risk of accidents in the wireless power feeding system by using the existing sensor installed in the inverter constituting the wireless power feeding system for railway vehicles to detect an abnormality in the feeding line at an early stage and to quickly cut off the current. It relates to an abnormality detection system and method (hereinafter referred to as 'abnormality detection system 100' and 'abnormality detection method') of a wireless feed line that enables 3 , it largely includes a data receiving unit 110 , a calculating unit 120 , a comparison analysis unit 130 , and a control unit 140 .

First, the data receiving unit 110 is the input measured from the voltage sensors (12a, 12b) and the current sensors (14a, 14b) provided in the wireless power inverter 10 (hereinafter referred to as 'inverter 10'), It serves to receive the output voltage value and the input/output current value, and the collected data is used for calculation of a factor of determiantion to be described later, that is, a factor that determines whether or not an abnormality occurs in the feed line.

That is, the inverter 10 used in the wireless power supply system for railway vehicles has several voltage sensors 12a and 12b that enable monitoring and control of the power state, that is, to control the input and output of voltage and current for realizing the function of the inverter 10 . ) and current sensors 14a and 14b are essentially installed at the input and output terminals, respectively, and the voltage and current values at the input and output terminals measured from the voltage sensors 12a and 12b and the current sensors 14a and 14b. Using these, it is possible to calculate a determinant to be described later without installing additional equipment or systems.

Next, the operation unit 120 receives the data received through the data receiving unit 110 , that is, the voltages at the input and output terminals measured from the voltage sensors 12a and 12b and the current sensors 14a and 14b of the inverter 10 . It serves to calculate the determinant factor for determining whether there is an abnormality in the feed line using the values and current values.

That is, the calculation unit 120 calculates the relationship between the effective input power and the effective output power of the inverter 10 by the following equation (1), and then uses this to calculate the decision factor by the equation (2). do.

In more detail, the formulas (1) and (2) can be expressed as follows,

... (1),

... (One),

... (2),

... (2),

Here, P _O and P _I represent the effective output power and the effective input power of the inverter 10 , respectively, η is the inverter 10 efficiency, and v _o and i _o are the voltage output from the inverter 10 and the It represents current, Factor is a determinant to determine whether there is an abnormality in the feed line, and θ means the difference between the phase of the voltage and the phase of the current.

In addition, the inverter 10, the effective input power and the input voltage and the input current of the inverter 10 used in the calculation of (P _I) is DC, the output voltage (v _o) and the output current (i _o) of the inverter 10 is an AC signal of 60 kHz and RMS (Root Mean Square) value.

First, the effective output power (P _O) of the (1) equation inverter 10 the It is a combination of two methods for calculating, one of which is _{calculated as the product of the effective input power P I} of the inverter 10 and the inverter efficiency η, and the other is the output voltage of the inverter 10 . (v _o ) is calculated as the product of the output current (i _o ) and the power factor (cosθ).

If Equation (1) is summarized for cosθ, it can be expressed as Equation (2), and cosθ generally means a power factor, but in the present invention, it is expressed as a concept of a factor of determination.

In other words, high-performance sensors and receivers are required to detect the phase of 60 kHz. In general, since such a measurement device is not installed inside the inverter 10, the phase cannot be calculated directly, so the error is large in terms of power factor. it may receive, the inverter 10 for the efficiency (η), a relatively accurate measurement is possible DC input power (P _I), i.e. determinants in an indirect way by using the input voltage and the product of the input current of the inverter 10 so that it can be calculated.

Although such a determinant may be insufficient as a power factor, it can provide sufficient information to detect an abnormality in the feed line.

In more detail, as shown in FIG. 2 , the feed line resonates at 60 kHz due to the configuration of the cable and the resonance capacitor.

In the inverter 10 used in wireless power feeding, if the output frequency is lower than the resonant frequency of the feed line, the switch elements of the inverter 10 stack do not perform soft switching but perform hard switching, resulting in poor efficiency and risk of element burnout. Therefore, about 5% higher frequency than 60kHz is used as the operating frequency.

Therefore, the phase of the feed line seen from the output terminal of the inverter 10 is generally not close to zero. The phase can be very close to zero or reversed.

That is, as shown in Equation (3) below, the resonant frequency (ω ₀ ) of the feed line is determined by the inductance (L) and resonant capacitance (C) of the feed line. When it decreases, the resonant frequency of the feed line rises.

In this process, the phase value approaches 0, and by using this principle, it is possible to detect abnormalities in the wireless feed line using the above-described determinant factor.

Next, the comparison and analysis unit 130 serves to determine whether an abnormality has occurred in the power supply line through comparative analysis of the determining factors calculated by the operation unit 120, and a first comparison step (S32) to be described later. And the work in the second comparison step (S34) is made in the comparison analysis unit (130).

In more detail, the comparison and analysis unit 130 _{first checks whether the output current i o} of the inverter 10 exceeds a preset threshold current i _th , which is output from the inverter 10 . This is to exclude the case where the determinant may appear abnormally in the transition period that starts to emit the output and under the condition that the output is being performed.

In this case, the threshold current i _th may be set to a value corresponding to about 1/2 of the rated current.

In addition, in the comparison and analysis unit 130, when the output current (i _o ) of the inverter 10 exceeds the threshold current (i _th ), whether the determination factor calculated by the operation unit 120 exceeds 0.95 To confirm, the condition where the determinant exceeds 0.95 means that the resonant frequency of the feed line and the operating frequency are very close or inverted.

That is, even considering the phase error, the condition that the determining factor exceeds 0.95 is a condition that is satisfied only when a special abnormality occurs in the feed line.

Next, the control unit 140 serves to control the supply of current to the inverter 10 according to the determination result of the comparison analysis unit 130 , and the power supply line is abnormal by the analysis by the comparison analysis unit 130 . If it is determined that there is no current, the inverter 10 is normally supplied with current, and, conversely, when it is determined that an abnormality has occurred in the power supply line by analysis in the comparison analysis unit 130, the output current from the inverter 10 It is designed to block

On the other hand, the data receiving unit 110, the calculating unit 120, the comparison analysis unit 130 and the control unit 140 constituting the abnormality detection system 100 according to the present invention is an operating system (hereinafter, ' Operating system'), since the operating system or inverter 10 records real-time voltage/current data, when a condition that determines that an abnormality has occurred in the above-described feed line occurs, the operating system In this case, the inverter 10 can be cut off immediately.

In addition, the abnormality detection system 100 according to the present invention may be configured to further include an alarm signal generating unit 150 and a monitoring unit 160 , wherein the alarm signal generating unit 150 is a comparative analysis unit 130 . It serves to generate an alarm signal according to the determination result in , and when it is determined that an abnormality has occurred in the power supply line by the analysis in the comparison analysis unit 130, the inverter 10 through the control unit 140 At the same time, by generating an alarm signal such as an alarm sound through the alarm signal generating unit 150 at the same time, an abnormality in the power supply line can be detected at an early stage, and accidents such as a fire can be prevented.

In addition, the monitoring unit 160 serves to enable the administrator of the operating system to check the input/output data of the inverter 10 , the operation result of the operation unit 120 , and the determination result of the comparison analysis unit 130 in real time. As shown in FIGS. 6 and 7 , the manager of the operating system checks the presence or absence of abnormalities in the feed line in real time through the input/output data of the inverter 10 displayed on the monitoring unit 160 in the form of log data. It is designed to be checked.

In addition, although not shown, when it is determined that an abnormality has occurred in the power supply line by the analysis in the comparison and analysis unit 130, an alarm signal is generated through the alarm signal generating unit 150 and the monitoring unit 160 at the same time. Of course, it can also be configured to indicate the occurrence of an abnormality in the feed line through the .

On the other hand, the abnormality detection method according to the present invention relates to a method of using the above-described abnormality detection system 100 to detect an abnormality in the power supply line at an early stage and to quickly shut off the inverter 10, As shown in FIG. 4, the configuration largely includes a data receiving step (S10), a determining factor calculation step (S20), a determining factor comparison step (S30), and a power-off step (S40).

First, in the data receiving step (S10), the input and output voltage values and input and output voltage values measured from the voltage sensors 12a and 12b and the current sensors 14a and 14b provided in the inverter 10 through the data receiving unit 110 are , It relates to the step of receiving the output current value, and as described above, the data received by the data receiving unit 110, that is, input and output voltage values and input and output current values determine whether or not an abnormality occurs in the feed line. It is used to calculate the determinant.

In addition, the input and output voltage values and input and output current values of the inverter 10 received in the data receiving step S10 may be displayed on the monitoring unit 160 in real time.

Next, the determining factor calculation step (S20) is a determining factor capable of detecting an abnormal state of the feed line by operation in the calculation unit 120 using the data received in the data receiving step (S10), that is, the abnormality of the feed line. It relates to the step of calculating the determining factor for determining whether or not the occurrence occurs, and includes a power calculation step (S22) and a determining factor calculation step (S24).

That is, the power calculation step S22 is performed using the input and output voltage values and input and output current values of the inverter 10 received in the data receiving step S10 , the effective input power P _I of the inverter 10 . and the effective output power P _O , respectively, wherein the determining factor calculation step S24 includes the effective input power P _I and the effective output power of the inverter 10 calculated in the power calculation step S22 . by using the power (P _O) it relates to calculating a determinant.

In the determinant factor calculation step (S24), the determinant factor is calculated by the above-described equations (1) and (2), and the contents are as described for the operation unit 120 of the abnormality detection system 100 described above. Therefore, a detailed description will be omitted.

Next, the determining factor comparison step (S30) relates to the step of determining whether there is an abnormality in the feed line through the comparative analysis of the decision factor calculated in the determining factor calculation step (S20), and the first comparison step (S32) and the first comparison step (S32) 2 The comparison step (S34) is included.

More specifically, the first comparison step (S32) relates to a step of comparing the magnitude _{of the output current i o} of the inverter 10 with the magnitude of the preset threshold current i _{th , wherein the threshold current (} i _th ) is a value for setting conditions for excluding the case where the determinant may appear abnormally in the transition period when the inverter 10 is outputting the output and the output is started, and as described above, set to 1/2.

As shown in FIG. 5 , as a result of the comparison in the first comparison step S32 , when the magnitude of the output current i _o of the inverter 10 is greater than the magnitude of the preset threshold current i _{th , a second} Proceeds to the comparison step (S34), and when _{the magnitude of the output current (i o} ) of the inverter 10 is equal to or less than the magnitude of the preset threshold current (i _th ), the data reception step without proceeding to the second comparison step (S34) It returns to (S10).

Next, the second comparison step (S34) relates to the step of checking whether the determination factor calculated in the determination factor calculation step (S20) exceeds 0.95, and the condition in which the determination factor exceeds 0.95 is resonance of the feed line It means that the frequency and the operating frequency are very close or inverted.

That is, as described above, the condition that the determining factor exceeds 0.95 is a condition that is satisfied only when a special abnormality occurs in the feed line.

In order to verify the conditions for abnormal occurrence of the feeding line as described above, the abnormal occurrence condition of the feeding line was applied to the data actually operated on the Gyeongsan wireless feeding test line. It operates reciprocally between stations A and B, where the wireless feed line is installed, and saves input/output voltage and input/output current data in units of about 0.2 seconds, respectively.

6 shows log data when a fire occurs due to a problem in the resonance capacitor of station A during operation of the wireless power supply system for light rail, (a) shows the inverter 10 input voltage and input current, (b) shows the output voltage and output current of the inverter 10, and (c) shows the determinant calculated using the data recorded in (a) and (b).

The time at which the failure occurred is about 17:31:12, and as can be seen in FIG. 6(c), the determinant maintains a value of about 0.8 or less during normal operation of the feed line, and the time at which the failure occurs It can be seen that there is a sharp increase from 0.95.

At this time, in (b) of FIG. 6 , it can be seen that the output voltage is greatly increased to about 2,000V when a failure occurs. Since a voltage of about 2,000V is not an overvoltage in the standard of the 1MW class inverter 10, the inverter 10 is a failure. don't judge

In addition, as can be seen in (a) and (b) of FIG. 6 , it was found that the input/output voltage and current of the inverter 10 fluctuate greatly at the time of the failure. However, voltage and current have a disadvantage in that it is difficult to set standards for detecting faults or abnormalities.

In particular, in the case of a large increase in voltage, an absolute standard cannot be determined because it may change according to the collection capacity of the current collector.

On the other hand, since the determining factor used in the abnormality detection method according to the present invention is configured to detect that a problem has occurred in the resonance capacitor regardless of the amount of load, it is possible to quickly and accurately detect the occurrence of an abnormality in the feed line.

Next, the power cut-off step (S40) relates to a step of cutting off the power output from the inverter 10 through the control unit 140 when it is determined that there is an abnormality in the feed line in the determining factor comparison step (S30). As described above, the case where _{the magnitude of the output current (i o} ) of the inverter 10 is greater than the magnitude of the preset threshold current (i _th ) and the determinant exceeds 0.95 by the comparison analysis unit 130 is detected as described above. In this case, the control unit 140 immediately cuts off the inverter 10 .

In addition, when the inverter 10 is cut off, an alarm signal is generated through the alarm signal generating unit 150 (alarm signal generating step (S50)), and the fact that an abnormality in the power supply line has occurred through the monitoring unit 160 is displayed. By doing so, it is structured so that the manager of the operating system can detect abnormalities in the feed line at an early stage and prevent a fire.

On the other hand, FIGS. 7(a) and 7(b) show the results of predicting the failure time when a problem occurs in the resonance capacitor using the determinant used in the present invention, respectively, in FIG. 6(c) Similarly, it can be seen that the determinant factor appears to be less than 0.8 during the finishing operation of the resonance capacitor, but rises above 0.95 at the time of failure or abnormality.

The reason why the value of the determinant is greater than 1 is that the input/output voltage fluctuates very much when a failure or abnormality occurs.

In addition, in the process of calculating the determinant factor, the efficiency of the inverter 10 is not accurately reflected, and an error may occur because the resolution of communication data is lowered. Since is shown to exceed 0.95, according to the abnormality detection system 100 and method according to the present invention, even when the above error occurs, it is possible to accurately predict that a failure or abnormality has occurred in the wireless power supply line.

Therefore, according to the abnormality detection system 100 and method of the wireless power feeding line according to the present invention as described above, the input/output measured by a typical sensor system for internal control of the inverter 10 constituting the wireless power feeding system for railway vehicles It is possible to reduce the risk of an accident in the wireless power supply system by using voltage and current to detect an abnormality in the power supply line at an early stage and cut off the current quickly without installing additional equipment, and the accuracy of the sensor And even if the communication resolution is low, it is possible not only to detect the occurrence of an abnormality in the feeding line, but also to use the existing system as it is to serve as an additional safety device to the existing fault or abnormal detection method, thereby maximizing the effect of detecting abnormalities in the feeding line. It has various advantages such as being able to do it.

Although the above-described embodiments have been described with respect to the most preferred examples of the present invention, it is not limited to the above-described embodiments, and it is apparent to those skilled in the art that various modifications are possible without departing from the technical spirit of the present invention.

The present invention relates to a system and method for detecting an abnormality in a wireless power feeding line, and more particularly, by using an existing sensor installed in an inverter constituting a wireless power feeding system for a railway vehicle to detect an abnormality in the power feeding line at an initial stage. Disclosed are a system and method for detecting abnormalities in a wireless power supply line that can reduce the risk of an accident in a wireless power supply system by allowing the current to be cut off quickly.

10: inverter 12a, 12b: voltage sensor
14a, 14b: Current sensor 100: Abnormality detection system
110: data receiving unit 120: calculating unit
130: comparative analysis unit 140: control unit
150: alarm signal generator 160: monitoring unit
S10: data receiving step S20: determining factor calculation step
S22: power calculation step S24: determinant factor calculation step
S30: determining factor comparison step S32: first comparison step
S34: second comparison step S40: power cut-off step
S50: Alarm signal generation stage

Claims (7)

In the wireless power feeding system for a railway vehicle comprising a wireless feed inverter, a feed line and a resonance capacitor,
A data receiving unit for receiving input and output voltage values and input and output current values measured from a voltage sensor and a current sensor provided in the wireless power inverter;
an operation unit that calculates a decision factor for determining whether there is an abnormality in the power supply line using the data received by the data receiving unit;
A comparative analysis unit for determining whether there is an abnormality in the power supply line through comparative analysis of the determinant factors calculated by the calculation unit;
a control unit for determining whether to cut off the output current from the inverter according to the determination result of the comparison analysis unit; and
Including an alarm signal generating unit for generating an alarm signal according to the determination result in the comparison analysis unit,
In the arithmetic section

Calculate the determinant by
In the comparison and analysis unit, when the output current of the inverter is greater than a preset threshold current and the determination factor calculated by the operation unit is greater than 0.95, it is determined that an abnormality has occurred in the feeding line due to a failure or abnormality of the resonance capacitor. An abnormality detection system of a wireless power supply line characterized by the.
(Here, Factor is a determinant, θ is the difference between the phase of voltage and phase of current, P _I is the effective input power, η is the inverter efficiency, and v _o and i _o are the voltage and current output from the inverter, respectively. indicates.)
delete delete delete A data receiving step of receiving input and output voltage values and input and output current values measured from a voltage sensor and a current sensor provided in the wireless power inverter to a data receiver;
a decision factor calculation step of calculating a decision factor for determining whether there is an abnormality in a power supply line in an operation unit using the data received in the data receiving step;
a decision factor comparison step of determining whether there is an abnormality in the feed line through comparative analysis of the decision factor calculated in the decision factor calculation step;
In the determining factor comparison step, when it is determined that there is an abnormality in the power supply line, a power cut-off step of cutting off the power output from the inverter through the control unit;
In the determining factor comparison step,
After checking whether the output current of the inverter exceeds a preset threshold current, the method for detecting abnormality in a wireless feed line, characterized in that it is checked whether the determining factor calculated in the determining factor calculation step exceeds 0.95.
6. The method of claim 5,
The determining factor calculation step is
A power calculation step of calculating the effective input/output power of the inverter using the input and output current values and input and output voltage values received in the data receiving step, respectively;
Using the calculation result in the power calculation step

Anomaly detection method of a wireless feed line, characterized in that it comprises a decision factor calculation step of calculating the decision factor by
(Here, Factor is the determining factor, θ is the difference between the phase of voltage and the phase of current, P _I is the effective input power, η is the inverter efficiency, and v _o and i _o are the voltage and current output from the inverter, respectively. indicates.)
delete

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