JP2011101557A - Power conditioner protection device and power conditioner protection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a power conditioner of a photovoltaic power generation system from direct lightning damage. <P>SOLUTION: This power conditioner protection device 1 is installed on the roof of a dwelling house H, detects thunder light and the lightning damage, instructs a switch 2 to perform the parallel-off of the power conditioner 3 when it is presumed that a thunder cloud exists in a region (direct lightning damage region) within a prescribed distance from the dwelling house H on the basis of the detected thunder light, thunder rumbles, and a time difference of both, and instructs the parallel return of the power conditioner 3 to the switch 2 when only the time at which the thunder cloud passes elapses after the instruction of the parallel-off, and when it is presumed that the thunder cloud exists in a region at a distance not shorter than the prescribed distance from the dwelling house H. The switch 2 is connected to both ends of the power conditioner 3, and performs the parallel-off and parallel return of the power conditioner 3 in accordance with an instruction from the power conditioner protection device 1. By opening the switch 2, even if a solar battery array 5, an on-pole transformer 11, and its circumference are damaged by lightning, the power conditioner 3 subjected to the parallel-off is prevented from being damaged by lightning. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power conditioner protection device for protecting a power conditioner of a photovoltaic power generation system from direct lightning damage.

  As a means of lightning damage countermeasures in a photovoltaic power generation system, it is said that installing a lightning arrester is effective against induced lightning.

JP 2007-116857 A

  In reality, however, lightning arresters themselves are burned against direct lightning strikes, resulting in damage to expensive power conditioners. In the future, the number of lightning damages caused by direct lightning strikes is expected to increase with the spread of solar power generation systems. Solar power generation systems currently have a 10-year warranty, but in order to continue using them for the next 40 years, permanent measures against lightning are indispensable.

  In addition, Patent Document 1 discloses a control device for a photovoltaic power generator that disconnects a switch to prevent lightning damage. However, in order to instruct the switch to disconnect / parallel, a lightning approach is disclosed. It does not describe how to detect.

  This invention is made | formed in view of the said subject, The main objective is to protect the power conditioner of a solar power generation system from a direct lightning strike.

  In order to solve the above-mentioned problems, the present invention provides a power conditioner protection device comprising: means for detecting lightning light; means for detecting thunder; a lightning detection time that is a time when the lightning is detected; Means for storing the thunder detection time that is the time at which the lightning was detected, means for calculating the time difference between the stored thunder light detection time and the thunder detection time, and the calculated time difference is within a first predetermined value. And a means for instructing the switch connected to the power conditioner of the photovoltaic power generation system to disconnect the power conditioner.

  According to this configuration, when it is determined that there is a thundercloud in the direct lightning strike area from the power conditioner protection device due to the time difference between the lightning detection time and the thunder detection time, the power conditioner of the photovoltaic power generation system is released by the switch. Since it is lined up, it is possible to prevent direct lightning damage from the inverter.

Further, in the power conditioner protection device of the present invention, it is determined that the calculated time difference is larger than the first predetermined value, and that the second predetermined value has elapsed since the time when the disconnection was instructed. In this case, the switch may be further provided with means for instructing the power conditioner to return in parallel.
According to this configuration, after disconnecting the inverter, when sufficient time has passed for the thundercloud to pass, and it is determined that there is a thundercloud outside the direct lightning strike zone due to the time difference between the thunderlight detection time and the thunderstorm detection time. In addition, since the inverter is returned in parallel by the switch, the inverter can be restarted.

Further, in the power conditioner protection device of the present invention, when a plurality of lightning lights and a plurality of lightning sounds are detected within a predetermined time, the time difference between the lightning light detection time and each lightning sound detection time for each lightning light detection time. And a means for specifying a common value between the lightning detection times among the plurality of time differences calculated for each lightning detection time as a time difference relating to thunderlights generated from the same thundercloud and thundering, and , May be further provided.
According to this configuration, when a plurality of thunderlights and a plurality of thunderstorms are detected in the same time zone in which the thundercloud does not move, the correspondence between the thunderlight detection time considered to be due to the thundercloud at the same position and the thunderstorm detection time By performing the above, it is possible to accurately identify the time difference between the lightning emitted from the thundercloud and the thunderstorm.

Further, in the power conditioner protection device of the present invention, when the detected lightning light level and change rate are equal to or higher than a predetermined value, the thunderlight detection time is stored, and the detected thunder light level and change rate is equal to or higher than a predetermined value. In this case, the thunder detection time may be stored.
According to this configuration, the level of thunder and thunder and each lower limit value are compared and checked, and the respective detection times are stored. Therefore, it is possible to remove light and sound noise outdoors and increase the accuracy of lightning determination. it can. Further, since the change rate of thunder and thunder is also checked against each lower limit value and the detection time is stored, it is possible to accurately detect only light and sound suddenly generated by thunder in the outdoors.

Further, in the power conditioner protection device of the present invention, means for obtaining the result of the determination from a plurality of other power conditioner protection devices installed in a predetermined area range, and the power conditioner protection device of the other power conditioner protection device It may be further provided with means for instructing the switch to perform disconnection or parallel return based on the determination result and the determination result of itself.
According to this configuration, by considering not only the determination result by the own device but also the determination result by other power conditioner protection devices installed in the same area, lightning and thunder from only one device can be considered. It is possible to prevent erroneous determination caused by erroneous detection, calculation, or processing malfunction.

  The present invention includes a power conditioner protection method. In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description of the mode for carrying out the invention and the drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the power conditioner of a solar power generation system can be protected from a direct lightning strike.

It is a figure which shows the structure of the electric power installation installed in a house. It is a figure which shows the structure of the power conditioner protection apparatus. It is a figure which shows the structure of the data memorize | stored in the memory | storage part 16 of the inverter protective device 1, (a) shows the structure of the lightning light data 16A, (b) shows the structure of the thunder sound data 16B. It is a block diagram which shows the outline | summary of a process of the inverter protective device. It is a flowchart which shows the detail of a process of the inverter protective device 1. FIG. It is a figure which shows the specific example of the process of S505 and S506 of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The power conditioner protection device according to the embodiment of the present invention applies to a switch connected to the power conditioner of the photovoltaic power generation system when detecting that there is a thundercloud within a distance where direct lightning is predicted. Instructing the disconnection of the inverters, instructing the parallel restoration of the inverters when it is detected that the thundercloud passage time has elapsed after the disconnection and the thunderclouds are outside the above distance It is. The determination of the presence or absence of thunderclouds in the direct lightning strike area identifies the thunder and corresponding thunder and compares the time difference between the specified thunder and the thunder with the time value over which the thunder is transmitted over the maximum distance at which direct thunder can occur. To do.

≪Configuration and outline of the device and its surroundings≫
FIG. 1 is a diagram illustrating a configuration of power equipment installed in a house. In a general house H, a power conditioner protection device 1, a switch 2, a power conditioner 3, a solar cell array 5 composed of a plurality of solar cell modules 4, a relay terminal box 6, watt hour meters 7 and 8, a power distribution A board 10 and a load 10 such as a television or a refrigerator are installed.

  The power conditioner protection device 1 is a device for protecting the power conditioner 3 from a direct lightning strike, and is installed on the roof of the house H. It is estimated that thunderclouds are within a predetermined distance from the house H due to thunder and thunder. In this case, the switch 2 is instructed to disconnect the power conditioner 3, and when it is estimated that the thundercloud is located at a position away from the house H by a predetermined distance, the switch 2 is instructed to return the power conditioner 3 in parallel. To do. The switch 2 is connected to both ends of the power conditioner 3 and performs disconnection / parallel return of the power conditioner 3 in accordance with instructions from the power conditioner protection device 1. By opening the switch 2, even if the solar cell array 5, the pole transformer 11, and the surrounding area receive direct lightning strike, the disconnected power conditioner 3 does not suffer from lightning damage.

  The power conditioner 3 converts the DC power received from the solar cell array 5 via the relay terminal box 6 into AC power, and supplies the converted AC power to the distribution board 9. Thereby, the electric power generated by the solar cell array 5 can be used by the load 10 in the home.

  On the other hand, AC power is supplied from the pole transformer 11 to the distribution board 9 and further consumed by the load 10 in the home. The watt-hour meter 7 is for demand power, and measures the amount of power consumed in the home. The watt-hour meter 8 is for surplus power, and measures the amount of power remaining after being generated by the solar cell array 5 and consumed by the load 10 in the home.

  FIG. 2 is a diagram illustrating a configuration of the power conditioner protection device 1. The power conditioner protection device 1 includes a lightning light measurement unit 11, a thunder sound measurement unit 12, a power generation amount acquisition unit 13, a switch control unit 14, a processing unit 15, and a storage unit 16. The lightning light measurement unit 11 is a part that detects lightning light, measures the intensity of the light, and outputs the measurement value data to the processing unit 15, and is realized by, for example, a photoelectric conversion device using a semiconductor. The thunder measurement unit 12 is a part that detects thunder, measures the volume of the sound, and outputs the measured value data to the processing unit 15, and is realized by, for example, a microphone. The power generation amount acquisition unit 13 is a part that acquires the power generation amount by the solar cell array 5 and outputs the power generation amount to the processing unit 15. For example, the power generation amount acquisition unit 13 is realized by measuring AC power converted from the power conditioner 3. In response to a request from the processing unit 15, the switch control unit 14 instructs the switch 2 to disconnect or restore the power conditioner 3. The processing unit 15 exchanges data between the respective units via a predetermined memory and controls the entire power conditioner protection apparatus 1. A CPU (Central Processing Unit) is stored in the predetermined memory. This is realized by executing the program. The storage unit 16 stores data from the processing unit 15 and reads the stored data, and is realized by a non-volatile storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), for example. The

<< Data structure >>
FIG. 3 is a diagram illustrating a configuration of data stored in the storage unit 16 of the inverter protection device 1. FIG. 3A shows the configuration of the lightning light data 16A. The lightning light data 16A is lightning light data detected during a predetermined time period (for example, 30 seconds), and is composed of records for each time period including the time period 16A1 and the lightning light measurement time 16A2. The period 16A1 indicates a detection period every 30 seconds, and is set every 30 seconds as time passes. As for the lightning measurement time 16A2, the lightning measurement unit 11 measures the intensity of the lightning light, and the lightning measurement time when the measured value is equal to or greater than a predetermined value is set. The example of FIG. 3A shows that there was no lightning during P0 and P3, three lightnings during P1, and two lightnings during P2. In addition, 30 seconds to 1 minute (within a predetermined time) is a time that the thundercloud hardly moves, and the lightning light within that time can be regarded as being from a thundercloud at the same position.

  FIG. 3B shows the configuration of the thunder data 16B. The thunderstorm data 16B is thunderstorm data detected in a predetermined period (for example, 30 seconds), and includes records for each period including the period 16B1 and the thunderstorm measurement time 16B2. The period 16B1 indicates a detection period every 30 seconds, and is set every 30 seconds with the passage of time. The thunder measurement time 16B2 is set to a thunder measurement time when the thunder measurement unit 12 measures the size of the thunder, and the measured value is equal to or greater than a predetermined value. The example in FIG. 3B shows that there was no thunder during P0 and P3, there were three lightnings during P1, and two lightnings during P2. In addition, 30 seconds to 1 minute (within a predetermined time) is a time that the thundercloud hardly moves, and a thunderstorm within that time can be regarded as being from a thundercloud at the same position. Accordingly, since it can be regarded as thunder and thunder from thunderclouds at the same position for 30 seconds to 1 minute, the interval between thunder and thunder is not changed.

≪Device processing≫
FIG. 4 is a block diagram showing an outline of processing of the power conditioner protection device 1. First, the time difference between the time when the lightning measurement unit 11 measures lightning and the time when the lightning measurement unit 12 measures lightning is checked. If the time difference between “thunder sound measurement time−lightning light measurement time” is 10 seconds or less and the power generation amount acquired by the power generation amount acquisition unit 13 is more than a very small amount, the switch 2 is powered by an instruction from the switch control unit 14. Disconnect conditioner 3. “Small amount” means a small amount of power generated by lightning. If the time difference is greater than 10 seconds and 10 minutes or more have passed since the switch 2 is disconnected, the switch 2 returns the power conditioner 3 in parallel according to an instruction from the switch control unit 14.

  The time difference threshold of 10 seconds (first predetermined value) is from thundercloud to house H when a thundercloud is in a direct lightning strike area (within about 2 km) where house H may receive direct lightning strikes. This is a value obtained by adding a margin to about 6 seconds, which is the time for thunder. The elapsed time threshold of 10 minutes (second predetermined value) is a time that is considered sufficient for the thundercloud to pass through the direct lightning strike area centered on the house H.

  In addition, the induced lightning area in which the house H may receive induced lightning is within about 10 km, and a lightning arrester can take measures against lightning in an area away from about 2 km. Moreover, the thunder sound audible range where the thunder can be heard in the house H is within about 15 km.

  FIG. 5 is a flowchart showing details of processing of the inverter protection device 1. This process describes a procedure for actually realizing the logic shown in FIG. 4 by the processing unit 15 of the inverter protection device 1.

  In the power conditioner protection device 1, first, the processing unit 15 acquires the intensity of thunder light measured by the thunder light measurement unit 11 with a period of 30 seconds, and acquires the size of thunder sound measured by the thunder measurement unit 12. Among the acquired measurement values, those having a predetermined value or more are extracted, and the measurement times of the extracted measurement values are stored in the lightning light data 16A and the lightning sound data 16B in the storage unit 16 (S501). At this time, as shown in FIG. 3, thunder light and thunder are divided and the measurement time is stored every 30 seconds. The reason why the measured value equal to or greater than the predetermined value is extracted is to remove noise of light and sound outdoors.

  Next, the processing unit 15 determines whether or not lightning light has been detected in the last 30 seconds (S502). Specifically, after a lapse of a predetermined 30 seconds, it is determined whether or not the lightning light measurement time 16A2 is set in the 30-second period 16A1 of the lightning light data 16A. If thunder light is detected (Y in S502), it is determined whether thunder light is detected within 10 seconds from the first detected thunder light among the thirty seconds of light (S503). Specifically, the first thunderlight measurement time 16A2 (for example, R4) set in the 30-second period 16A1 (for example, P2) in the thunderlight data 16A is specified. Then, in the thunderstorm data 16B, it is determined whether or not the thunderstorm measurement time 16B2 set in the same period 16B1 (eg, P2) is within 10 seconds from the thunderlight measurement time 16A2 (eg, R4). To do.

  If there is a corresponding thunder sound measurement time 16B2 (Y in S503), the processing unit 15 determines whether or not thunderlight is detected in the last 16 seconds period 16A1 (for example, P1) of the lightning light data 16A, that is, Then, it is determined whether or not the lightning measurement time 16A2 is set (S504). If thunder light is detected in the previous 30 seconds (Y in S504), the same thunder for the 1-minute period including the previous 30 seconds (P1) and the latest 30 seconds (P2) In order to associate the lightning light measurement time 16A2 with the lightning sound measurement time 16B2, the time difference between the lightning light measurement time 16A2 and each lightning sound measurement time 16B2 is calculated for each lightning light measurement time 16A2 (S505). Then, a value common to the lightning light measurement time 16A2 is extracted from a plurality of time differences calculated for each lightning light measurement time 16A2, and the common value is specified as a time difference related to thunder light from the same thundercloud and thunder. (S506).

  Subsequently, the processing unit 15 determines whether or not the time difference is 10 seconds or less (S507). If it is 10 seconds or less (Y in S507), it means that the thundercloud is in the direct lightning lightning area, and therefore it is determined whether or not the power generation amount acquired from the power generation amount acquisition unit 13 is more than a minute amount (S508). If the amount of power generation is greater than or equal to a small amount (Y in S508), the switch control unit 14 is requested to issue a disconnection instruction to the switch 2 (S509). If no thunder light was detected in the previous 30 seconds in S504 (N in S504), the first thunder light and the thunder within 10 seconds are considered to be caused by the same thunder. Make a decision.

  If no thunder light has been detected in the last 30 seconds (N in S502), or if thunder has not been detected within 10 seconds from the first thunder light (N in S503), the time difference between thunder and thunder is 10 If it is greater than 2 seconds (N in S507) or if the amount of power generation is not very small (N in S508), none of the conditions for disconnecting the switch 2 is satisfied, and the process returns to the storage of the measured value in S501. For example, if there is no sound even if there is light, or if it takes more than 10 seconds and there is sound, the thundercloud is considered to be far from the direct lightning strike area, so nothing is done and the process returns to S501.

  The processing unit 15 waits for a lapse of 10 minutes or more, which is the time for the thundercloud to pass through the direct lightning strike area, after requesting the disconnection instruction to the switch 2 (S509). Thereafter, it is determined whether there has been thunder after 10 seconds from lightning (S511). In this determination, it is confirmed that no thunder was detected within 10 seconds after actually detecting lightning. If no corresponding event is detected (N in S551), the determination is repeated. If a corresponding event is detected (Y in S551), the switch controller 14 is requested to issue a parallel return instruction to the switch 2 (S512), and the process returns to the storage of the measured value in S501.

<Example>
FIG. 6 is a diagram showing a specific example of the processing of S505 and S506 of FIG. As examples of the level for detecting lightning, three examples are shown: (A) a level not detected, (B) a level detected soon, and (C) a level detected. As an example, (C) the level to be detected will be described. First, there are two lightning measurement times in period P2, lightning measurement time S4 within 10 seconds (actually about 8 seconds later) from the first lightning measurement time R4, and lightning measurement in the previous period P1. Since there are times R1 to R3, the processing of S505 and S506 associates the lightning generated from the same thunder with the thunder and identifies the time difference between them. At that time, as shown in FIG. 6, the lightning measurement times R2, R3, and R4 are calculated by calculating the time difference from the lightning measurement times S2, S3, S4, and S5, and divided into groups according to the lightning measurement times. And the association with the thunder measurement time and the time difference between them. Then, by extracting a time difference that is common among the three groups, the thunder light measurement time that is the basis of the time difference and the thunder sound measurement time correspond to the same thunder. In the case of (C), the common time difference is “8 seconds”, and R4 and S4, R3 and S3, and R2 and S2 correspond to each other. Similar processing is performed for (A) and (B), and the common time differences are “28 seconds” and “16 seconds”, respectively, and the same times correspond to each other.

  In the above embodiment, in order to make each part of the inverter protector 1 shown in FIG. 2 function, a program executed by the processing unit 15 is recorded on a computer-readable recording medium, and the recorded program Is read and executed by the computer, the power conditioner protection apparatus 1 according to the embodiment of the present invention is realized. In this case, the program may be provided to the computer via a network such as the Internet, or a semiconductor chip or the like in which the program is written may be incorporated in the computer.

  According to the embodiment of the present invention described above, when it is determined by the time difference between the lightning measurement time 16A2 and the thunder sound measurement time 16B2 that there is a thundercloud in the direct lightning strike region from the power conditioner protection device 1, the switch 2 Thus, the power conditioner 3 of the photovoltaic power generation system is disconnected, so that the direct lightning damage of the power conditioner 3 can be prevented. In addition, when a sufficient amount of time has passed for the thundercloud to pass thereafter and it is determined that there is a thundercloud outside the direct lightning strike due to the above time difference, the power conditioner 3 is returned in parallel by the switch 2, so the power conditioner 3 Can be restarted.

<< Other embodiments >>
As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, the following embodiments can be considered.

(1) In the above embodiment, the power conditioner protection device 1 stores the measurement time of thunder and the measurement time of thunder in the storage unit 16 when the intensity of thunder and the size of thunder are greater than or equal to predetermined values. As described above, a condition that the temporal change rate of the intensity of lightning light and the temporal change rate of the size of thunderstorm may be added to a predetermined value or more may be added. According to this, lightning and thunder are detected suddenly, so even light of intensity greater than or equal to a predetermined value or sound of a magnitude greater than or equal to a predetermined value gradually slowly exceeds a predetermined value over time. Because it is not considered to be caused by lightning, it is possible to improve the detection accuracy of lightning and thunder by removing such light and sound.

(2) In the above embodiment, it has been described that one power conditioner protection device 1 detects lightning in the direct lightning strike area. The determination result regarding lightning is obtained from the power conditioner protection devices 1 installed in the plurality of houses H, a comprehensive determination result is obtained by majority decision of the determination results, and the determination result is obtained for each power conditioner protection device 1. You may provide a server that returns to One of the inverter protection devices 1 in the circular area may have the function of the server. According to this, only one power conditioner protection device 1 gives an erroneous determination due to erroneous detection of the lightning light measurement unit 11 or thunder sound measurement unit 12, malfunction of the power generation amount acquisition unit 13 or processing unit 15, and the like. Although there is a possibility, a correct determination can be made as much as possible based on the determination results obtained by the plurality of power conditioner protection devices 1 in the same region.

  For example, the power conditioner protection device 1 at home determines that lightning is near, but if there is no detected house in the vicinity (neighborhood), it is determined as misrecognition. On the other hand, the power conditioner protection device 1 at home does not detect lightning, but it is detected when there are many houses detected around. And on / off management of the switch 2 may be performed for every house H, and when unifying in the area, it may be collectively performed by a server.

1 Power conditioner protection device 11 Lightning measurement unit (means to detect lightning)
12 Thunder measurement unit (means to detect thunder)
13 Power generation amount acquisition unit 14 Switch control unit (means for instructing disconnection, means for instructing parallel return)
15 Processing Unit 16 Storage Unit 16A1 Period (Time Zone)
16A2 Lightning measurement time (lightning detection time)
16B1 period (time zone)
16B2 Lightning measurement time (lightning detection time)
2 Switch 3 Power conditioner H Housing

Claims (10)

A means of detecting lightning,
Means to detect thunder,
Means for storing a lightning detection time that is a time when the lightning was detected, and a thunder detection time that is a time when the thunder was detected;
Means for calculating a time difference between the stored lightning detection time and the thunder detection time;
Means for instructing the switch connected to the power conditioner of the photovoltaic power generation system to disconnect the power conditioner when it is determined that the calculated time difference is within a first predetermined value;
A power conditioner protection device comprising: The inverter protection device according to claim 1,
When it is determined that the calculated time difference is greater than the first predetermined value and the second predetermined value has elapsed since the time when the disconnection is instructed, the power conditioner is connected in parallel to the switch. A power conditioner protection device, further comprising means for instructing a return. (Device claim: Identifies multiple lightning strikes and thunderstorms within a given time)
A power conditioner protection device according to claim 1 or claim 2,
If multiple lightnings and multiple thunders are detected within a given time,
Means for calculating a time difference between the lightning detection time and each lightning detection time for each lightning detection time;
Among a plurality of time differences calculated for each lightning detection time, a means for specifying a common value between the lightning detection times as a time difference related to thunderlight generated from the same thundercloud and thunderstorms,
A power conditioner protection device, further comprising: A power conditioner protection device according to any one of claims 1 to 3,
When the level and rate of change of the detected lightning light is a predetermined value or more, the lightning light detection time is stored,
The power conditioner protection device, wherein the thunder detection time is stored when the detected thunder level and change rate are equal to or greater than a predetermined value. A power conditioner protection device according to any one of claims 1 to 4,
Means for acquiring the result of the determination from a plurality of other inverter protection devices installed in a predetermined area range;
Based on the result of the determination of the other inverter protection device and the result of its own determination, means for instructing the switch to be disconnected or returned in parallel,
A power conditioner protection device, further comprising: A method for protecting a power conditioner of a photovoltaic power generation system from a direct lightning strike by a computer,
The computer
Detecting lightning,
Detecting thunder,
Storing a lightning detection time which is a time when the lightning was detected and a thunder detection time which is a time when the thunder was detected;
Calculating the time difference between the stored lightning detection time and the thunder detection time;
Instructing the switch connected to the power conditioner to disconnect the power conditioner when it is determined that the calculated time difference is within a first predetermined value;
The inverter protection method characterized by performing. The inverter protection method according to claim 6,
The computer
When it is determined that the calculated time difference is greater than the first predetermined value and the second predetermined value has elapsed since the time when the disconnection is instructed, the power conditioner is connected in parallel to the switch. A method for protecting an inverter, further comprising the step of instructing a return. A power conditioner protection method according to claim 6 or 7,
The computer
If multiple lightnings and multiple thunders are detected within a given time,
Calculating a time difference between the lightning detection time and each lightning detection time for each lightning detection time;
Among a plurality of time differences calculated for each lightning detection time, identifying a common value between the lightning detection times as a time difference related to lightning generated from the same thundercloud and thunderstorms,
A method for protecting the inverter, further comprising: A power conditioner protection method according to any one of claims 6 to 8, comprising:
The computer
When the detected level and rate of change of the lightning light is greater than or equal to a predetermined value, the lightning light detection time is stored,
The power conditioner protection method, wherein the thunder detection time is stored when the detected thunder level and change rate are equal to or greater than a predetermined value. A power conditioner protection method according to any one of claims 6 to 9,
The computer
Obtaining the result of the determination from a plurality of other computers installed in a predetermined area range;
Instructing the switch to perform disconnection or parallel return based on the result of the determination of another computer and the result of its own determination;
A method for protecting the inverter, further comprising: