JP2001314037A - Linked system inverter, solar power generation system and battery charging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display and record a plurality of error detection information pieces resulting from the same cause as a single detection information. SOLUTION: A linked system inverter comprises a controller I including a DC/AC converter, a DC voltage detector, a DC current detector, an AC voltage detector, a part of the entire part of AC current detector, a computer and a real-time clock. The controller I comprises a non-volatile memory means S as a means to record the information, a display means D as a means to display the data for users, a plurality of error detecting means E1, E2, E3 as the means for detecting an error as the error detecting information for a plurality of monitoring items of the error factor, and a centralizing means C for centralizing a plurality of error detecting information pieces detected from a plurality of error detecting means resulting from the same cause as the single error information and then generating the centralized error information E11 as one detected information piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid-connected inverter as a power control device (power conversion means and the like) and a photovoltaic power generation system using the same.

[0002]

2. Description of the Related Art In recent years, practical use of residential photovoltaic power generation systems has rapidly progressed, and many photovoltaic power generation systems have been operated in the market. As the number increases, the absolute number of failures in the market tends to increase,
Service response is gaining importance.

For such a purpose, Japanese Patent Laid-Open No. 11-1
No. 19846 discloses that errors (that is, failure information) are displayed not by codes (symbols or numbers) but by sounds or character data. Also, JP-A-11-23504
No. 6 discloses that an error is recorded in a nonvolatile memory.

[0004]

The system interconnection inverter has many built-in protection functions. For example, it is common practice to monitor AC output voltage and frequency, display errors such as undervoltage, underfrequency, overvoltage, overfrequency, etc., and stop the grid-connected inverter.

On the other hand, a plurality of errors often occur simultaneously for one cause. For example, in the case of a power failure, an underfrequency and an undervoltage are often detected simultaneously. In such a case, according to the above-described conventional technology, only the items are displayed or recorded for each item. Therefore, it is not possible to recognize the same cause without specialized knowledge. In addition, since recording is performed for each item, a plurality of recording memory areas are consumed even for errors of the same cause, and since the memory is limited, the number of recordable events is substantially reduced. there were. Further, in the above-described conventional technology, since the recording / display target is a failure, it is not possible to know the stop time (so-called downtime) due to the failure of the device or system.
Therefore, it was difficult to estimate the amount of decrease in the amount of power generation.

[0006] The present invention has been made in view of the above problems, and a plurality of abnormalities (errors) originating from the same cause.
It is an object to display and record information (abnormality detection information) detected as a single piece of detection information.

[0007]

In order to solve the above problems, a system interconnection inverter of the present invention comprises a DC / AC converter,
DC voltage detection unit, DC current detection unit, AC voltage detection unit, and part or all of the AC current detection unit, and a system interconnection inverter including a control unit having a computer and a real-time clock, the control unit, Nonvolatile storage means for recording information, display means for displaying to the user, error detection means for detecting an error factor as error detection information over a plurality of monitoring items, and a plurality of error detection means originating from the same cause. An aggregation means for integrating a plurality of pieces of abnormality detection information detected by the abnormality detection means as a single piece of abnormality information and generating the aggregated abnormality information as one piece of detection information.

In the present invention, the control section can display the detection information generated by the aggregation section to the user on the display section.

Further, the control unit can record the detection information generated by the aggregation unit in the nonvolatile storage unit.

[0010] Further, the control unit may record, in the non-volatile storage means, status information which is information on a status of the grid interconnection inverter including the abnormality detection information and time information.

The control unit includes state information analysis means for analyzing state information of the grid-connected inverter, and analyzes the state information recorded in the nonvolatile storage means by the state information analysis means. The information obtained as a result can be displayed on the display means.

[0012] Preferably, the status information recorded in the non-volatile storage means is recorded as data having a bit width of 2 bits or more.

[0013] Further, it is preferable that the control unit calculates the loss of the power generation amount during the power outage period from the state information recorded in the non-volatile storage means by the state information analysis means and displays the loss on the display means. .

A solar power generation system according to the present invention comprises: a solar cell array for performing photoelectric conversion by connecting a plurality of solar cell modules in series and / or in parallel; a load consuming output power of the solar cell array; An AC converter, a DC voltage detector, a DC current detector, an AC voltage detector, and a part or all of the AC current detector, and a system interconnection inverter having a control unit including a computer and a real-time clock. In the photovoltaic power generation system, the control unit includes a non-volatile storage unit that records information, a display unit that displays the information to a user, and a plurality of abnormalities that detect an error factor as abnormality detection information over a plurality of monitoring items. A plurality of abnormality detection information detected by the detection means and the plurality of abnormality detection means derived from the same cause are aggregated as a single abnormality information. Characterized by comprising the aggregation means for generating the aggregated abnormality information as one of the detection information.

In the present invention, the control section can display the detection information generated by the aggregation section to the user on the display section. Further, the control unit can record the detection information generated by the aggregation unit in the nonvolatile storage unit. In addition, the control unit can record, in a nonvolatile storage unit, state information that is information on a state of the photovoltaic power generation system including the abnormality detection information and time information. The control unit further includes state information analysis means for analyzing state information of the photovoltaic power generation system, and analyzes the state information recorded in the nonvolatile storage means by the state information analysis means, and obtains a result. The displayed information can be displayed on the display means.

Preferably, the status information recorded in the nonvolatile storage means is recorded as data having a bit width of 2 bits or more. Furthermore, the state information analysis means calculates a power generation loss during a power outage period from the state information recorded in the nonvolatile storage means,
Preferably, the information is displayed on the display means.

A battery charging system according to the present invention includes a solar cell array for performing photoelectric conversion by connecting a plurality of solar cell modules in series and / or in parallel, and a control for charging a battery with power from the solar cell array. A battery charging system including an overcharge protector having a unit, wherein the overcharge protector includes an aggregation display unit that aggregates and displays detection information; a storage unit that records display contents of the aggregation display unit; Abnormality detecting means for detecting an abnormality using the factor as abnormality detection information.

[0018]

FIG. 1 is a diagram showing components of a control unit I used in a system interconnection inverter according to an embodiment of the present invention. As shown in FIG. 12, the abnormality detecting means El, E2, and E3 for detecting the error factor Ev basically include a detecting means 101 for a monitoring target 104 (voltage, frequency, etc.), a reference value generating means 102, and a comparator 103. Consists of Here, FIG. 12 is a diagram showing a specific example of the abnormality detecting means E1, E2, E3 for detecting the error factor Ev. That is, it is an apparatus that generates an output when the monitoring target 104 exceeds or decreases a certain standard. These individual components, whether digital or analog, can take a wide variety of forms known and used.

In FIG. 1, when a plurality of pieces of abnormality detection information are input simultaneously or within a time considered to be simultaneous, an aggregation means C aggregates the pieces of abnormality detection information into one piece of new detection information E.
11 is generated. As a generation method, information considered to be unnecessary is deleted from a plurality of pieces of detection information, or information considered to be the most important is extracted from a plurality of pieces of information. Alternatively, a conversion table in which cause events for a plurality of factors are recorded is prepared, and this is performed. In order to configure such a mechanism, there are a combinational hardware logic circuit and a method of realizing it as software by a microcomputer. Practically, it is simple to use a microcomputer, and various operations are possible.

The display means D may be anything as long as it can be displayed significantly to humans. Many known and publicly-known technologies such as a liquid crystal display capable of displaying characters and a display in which a plurality of LEDs are arranged can be used.

The storage means S is for storing abnormality information, and various kinds of means such as an EEPROM, a CMOS-RAM backed up by a secondary battery, a magnetic card and the like can be used. Many photovoltaic power generation systems are configured so that the control power is turned off at night. To store abnormal information for several days, non-volatile memory that does not lose information even if the power is lost Is required. Incidentally, in a system interconnection inverter of a type in which the control power supply is not always turned off, the normally used memory itself may be considered to be equivalent to the nonvolatile memory according to the present invention. One of the key points of the present invention is to collect a plurality of errors and record them. As a result, the effect that the memory capacity for recording can be reduced is obtained because there is no change even in the above-described system interconnection inverter. There are no special restrictions on the components other than those described above, as long as the purpose and object of the present invention are achieved.

FIG. 2 shows a typical operation flow of the embodiment of the present invention. When an error occurs, it is checked whether there is a plurality, and if there are a plurality, they are consolidated, recorded in a non-volatile memory, and displayed. Among them, an important operation sequence (execution order) is to be displayed after aggregation, so that a plurality of errors can be shown to the user in a single expression. Further, in FIG. 2, since the recording is performed after the aggregation, the effect of reducing the memory capacity for recording the abnormal information is obtained.

[0023]

Next, an embodiment of the present invention and an application example thereof will be described with reference to the drawings. [Embodiment 1] In this embodiment, a specific embodiment using simple hardware logic will be described. FIG.
FIG. 1 is a diagram showing a configuration example of a grid-connected inverter according to one embodiment of the present invention.

The grid-connected inverter includes a DC / AC converter 3
1. DC voltage detector 32, DC current detector 33, AC voltage detector 34, AC current detector 35, microcomputer (data bus width 8 bits, hereinafter referred to as CPU)
And a control unit 36 having a real-time clock (hereinafter referred to as RTC), a non-volatile memory (EEPROM), and display means (display device).

The converter 31 is constituted by a full bridge circuit using IGBT. An insulating amplifier was used for the DC voltage detector 32, and a DC current transformer (DCCT) was used for the DC current detector 33. Further, a potentiometer transformer (PT) was used for the AC voltage detector 34, and a current transformer (CT) was used for the AC current detector 35.
For these, a large number of publicly known and used technologies and articles can be used.
Further, the configuration is not related to the essence of the present embodiment, and will not be described in detail.

An important part of this embodiment is the configuration of the control unit 36, which will be described in detail with reference to FIG.
FIG. 4 is a diagram illustrating a specific example of the control unit 36. Here, in order to clarify the essence of the present embodiment, only two of the undervoltage detection element 41 and the underfrequency detection element 42 are prepared as items of the abnormality detection means. As the aggregation means 43, a combinational logic circuit of the AND circuits 45, 47, 48 and the NOT circuit 46 shown in FIG. Error judgment output is CPU parallel port 44 (8-bit width)
Is input to the 0th bit b0, the first bit bl, and the second bit b2.

FIG. 5 shows the structure of the error data used in this embodiment, and FIG. 6 shows the processing flow of the part related to the error processing. In FIG. 6, the port data is read, and if there is nothing, no error is returned. If a bit is set in the port, the value is stored in the memory as an error code (1 byte), the time information (year, month, day, hour, minute, 5 bytes) is read from the RTC, and combined with the error code described above.
The data is stored in a nonvolatile memory (not shown) as nonvolatile storage means as data having a byte length. Thereafter, a display unit (not shown) as a display means displays characters and time information corresponding to the error code on a dot matrix type liquid crystal display (hereinafter, referred to as LCD) as a display device. In this embodiment, the characters “voltage drop” are assigned to the 0th bit, “frequency drop” is assigned to the 1st bit, and “power failure” is assigned to the 2nd bit. I did it.

In this embodiment, since the aggregation means is constituted by hardware logic, the operation flow shown in FIG. 6 has no portion for performing the aggregation operation, and there is no need to classify simultaneously occurring errors, thereby simplifying the operation. Configuration.

Next, the operation of this embodiment will be described.
When the AC voltage drops at 14:38 on October 25, 1999, the undervoltage detection element 41 generates an output and the CP
The 0th bit is set in the parallel port of U. And LC
D is displayed as "Voltage drop 1999/10/25 14:38", and 6 bytes (FIG. 5) of data are stored in the nonvolatile memory.

Similarly, when the AC frequency is lowered, the display "frequency lowered 1999/10/25 14:38" and the recording in the nonvolatile memory are performed. Here, when “voltage drop” and “frequency drop” occur simultaneously, in FIG. 4, both outputs of the undervoltage detection element 41 and the underfrequency detection element 42 are turned on. This is sent to the second bit of the parallel port 44.

The output of the AND circuit 45 is sent to AND circuits 47 and 48 through a NOT circuit 46. These receive the output of the undervoltage detection element 41 and the output of the underfrequency detection element 42, respectively, and when two events occur simultaneously, outputs corresponding to "voltage drop" and "frequency drop" are not sent to the CPU. Like that.

As a result, only the second bit is set in the CPU, and "power failure 1999/10/2" is displayed on the display device.
5 14:38 "is displayed, and 6 bytes, that is, data corresponding to one event are recorded in the nonvolatile memory.

If there is no aggregation means, it is necessary to classify simultaneously occurring errors (for example, b0 and bl simultaneously occur) by software. As for the display, for example, "voltage drop 1999/10/25 14:38" and "frequency drop 1999/10/2514: 38" are displayed, and what is the true cause for a user without specialized knowledge. It becomes difficult to understand. If one event and one data are recorded in the nonvolatile memory, 12 bytes of data are written to the nonvolatile memory. for that reason,
The consumption of the non-volatile memory increases, and the number of events that can be recorded decreases.

As described above, according to the present embodiment, since information display and recording are performed for a plurality of abnormality detections, the effect of identifying the true cause (power failure in this embodiment) and reducing the capacity of the storage device is expected. it can.

As a configuration of the aggregation means, new detection information is generated and other information is suppressed as in this embodiment. Further, it is conceivable to preferentially extract specific information. Furthermore, in the present embodiment, the aggregation means is configured by hardware logic, but it is of course possible to implement it by software.

In the present embodiment, the storage device and the display device are built in the control device. However, the storage device and the display device may be outside the system interconnection inverter. The essence of the present embodiment is to collectively display and record a plurality of pieces of abnormality information. Various changes are possible as long as this intention can be achieved. For example, it is possible to output in paper form using a printer, because the purpose of the present embodiment is taken into account.

[Embodiment 2] In this embodiment, a description will be given of an implementation system of a type that records state information that enables more detailed phenomenon analysis. The analysis and display mechanism is configured as an external type using a notebook computer or the like. Then, a record triggered by “regeneration of power generation” is executed to enable downtime measurement and to indicate that the power generation loss can be estimated. This makes it possible to estimate the effects on the life of the solar cell peripheral devices (particularly, the capacitors of the grid-connected inverter).

The configuration of the system interconnection inverter of this embodiment is as follows.
There is almost no difference from the first embodiment shown in FIG. The only changed part is the configuration of the control unit 36. In the first embodiment, an abnormality detection and aggregation unit using hardware is used to show the essence of the present embodiment. However, in the present embodiment, the configuration is such that the abnormality detection means and the like are all performed by the CPU. Specifically, in FIG. 3, the DC voltage / current detection units 32 and 33 and the AC voltage / current detection units 34 and 35
The output from the control unit 36 is taken as digital data by an A / D converter into the CPU of the control unit 36, and is processed to perform a desired operation. Also, an external notebook personal computer is used as the analysis mechanism, the display means, and the non-volatile storage means serving as the aggregation means, and the state information recorded in the grid-connected inverter is taken in using the communication line. Configured.

FIG. 7 shows an operation flow of a part relating to the recording of the state information of the system interconnection inverter. In summary,
It provides a function of checking for the presence or absence of a trigger, and generating and recording state information if a trigger is present (does nothing and terminates if there is no trigger).

The contents of the state information include, for example, a voltage and a current. Practically, it is preferable to add time information to this. Increasing the precision (that is, the bit width) increases the memory for expressing the state information. Therefore, the precision should be kept to a minimum. Lempel-Z
Using an information compression technique typified by the iv method can reduce the amount of data of the state information.

The status information of the grid-connected inverter and the system is generated, updated and recorded by using the status change as a trigger. The trigger for the state change includes a time (for example, every second), an operation state (whether the apparatus is operating or stopped), an abnormality detection state (occurrence of an abnormality, recovery from an abnormality), and the like. Updating and recording the status information at predetermined intervals seems almost perfect for troubleshooting purposes. However, in practice, there is a disadvantage that a large amount of memory is required. Such state information and its generation conditions are determined by taking into account hardware resources (memory capacity and the like) that can be used in the grid-connected inverter and the photovoltaic power generation system, as well as an item group constituting the trigger condition and the state information, and The content of the item may be determined as appropriate.

Particularly, in a photovoltaic power generation system, it is practically convenient to record this as a trigger not only when an abnormality is detected but also when the abnormality is recovered. By doing so, the downtime can be ascertained with certainty, so that it is possible to know how much the power generation has been lost compared to the schedule.

Taking these facts into consideration, in this embodiment, the AC voltage (8 bits), the AC frequency (8 bits), the solar cell voltage (8 bits), the solar cell current (8 bits), and the Ground voltage (8 bits), time information (resolution 1 minute, width 5 bytes), abnormality detection code (8 bits), total 11 bytes. As described above, by adopting a data item having a certain bit width in the status information, it is possible to consider not only the presence / absence of an error but also the degree of an abnormal phenomenon in an analog manner. Further, more detailed phenomenon analysis can be performed. In the system interconnection inverter used in this embodiment, since a 2048-byte flash memory is employed, 186 state information can be recorded.

The error to be recorded is assigned for each bit of the abnormality detection code, and has the following meaning.

B0. . . AC voltage drop b1. . . AC frequency drop b2. . . AC voltage sudden change detection b3. . . AC voltage rise suppression b4. . . System synchronization loss b5. . . Ground fault b6. . . DC overvoltage b7. . . Frequency shift detection The state information having the above configuration is a so-called “aggregate of a plurality of pieces of abnormality detection information”. Recording this as aggregated information, analyzing it, and displaying it is a feature and essential of the present embodiment. Of course, further collecting and recording some of this status information and displaying it do not disturb the intention of the present embodiment. In the present embodiment, the configuration is such that the status information is analyzed every day and displayed collectively.

As triggers for recording in the non-volatile memory, there are three items: power generation start, normal stop, and abnormality detection. As a result, in the case of a normal solar power generation system, the status information is written to the nonvolatile memory at least once in the morning (start of power generation) and once in the evening (normal stop).

FIG. 8 shows a schematic operation flow of a notebook personal computer as an aggregation (analysis) means and the like, and FIG. 9 shows an operation flow of an error display part as a data analysis and display means as a state information analysis means therein. In this embodiment, the grid-connected inverter is operated for an arbitrary period, and status information accumulated during the operation is sent to the notebook personal computer via the RS232C serial communication line. And I decided to analyze and display it every day.

Next, the operation of this embodiment will be described by taking data over two days as an example. In order to complete the photovoltaic power generation system, which is the operating environment of the grid-connected inverter, a solar cell array (160V, 24A) is connected to the grid-connected inverter input. Then, the output of the system interconnection inverter is converted to a commercial AC system (single-phase three-wire system, 200
V, 60 Hz) to form a grid-connected solar power generation system.

First, on 9/27/99, the grid-connected inverter was started at 7:32, continued power generation, and stopped at 17:51. Under the conditions described in detail in this embodiment, the state data recorded in this day is “start” and “stop” twice.

Next, on 9/28/99, it started at 7:40, and at 12:40, a power failure occurred. At this time, "AC voltage drop" b0, "AC frequency drop" b1, "AC voltage phase sudden change detection" b2, and "system synchronization loss" b4 were detected. At that time, the voltage of the solar cell array 1 (FIG. 3) was 150 V, and the current was 22 A. In addition, 12: 4
A "restart" occurred on 1. At this time, the voltage of the solar cell array (solar cell voltage) was 150 V, and the current of the solar cell array (solar cell current) was 22 A. As described above, these analog data can also be written in the status information. After this, the operation continued smoothly and at 17:45
In, the grid-connected inverter stopped.

Thereafter, FIG. 10 shows an example of a display in which a notebook personal computer is connected, recorded state information is collected from the grid-connected inverter, and analyzed and displayed according to FIG. In the analysis of the present embodiment, the aggregation step C (FIG. 9)
The configuration is such that when two or more of 0 / bl / b2 / b4 are detected, “power failure” is set.

As described above, even with an external configuration, the purpose of “integrated display of a plurality of errors” intended in the present embodiment can be achieved. At this time, the output is obtained from the recorded solar cell voltage and solar cell current, and the display is performed as shown in FIG. And the power generation loss is 3.3 kW × 10 minutes =
The calculated value is 0.55 kWh (in this embodiment, the time of the power failure is rounded up to the nearest minute in seconds) and displayed. Here, FIG. 10 is a display example of the display means of the present embodiment. By recording analog data that cannot be represented by a single bit in the state information, more detailed analysis can be performed. In particular, by knowing the downtime, it is possible to obtain effective information on how long a component such as an electrolytic capacitor whose life is almost determined can be used for system maintenance.

In this embodiment, the analysis display device is provided externally. However, it is of course possible to incorporate the analysis display device as in the first embodiment.

[Embodiment 3] In this embodiment, an application example of the present invention to an independent system will be described. FIG. 11 is a schematic configuration diagram of the present embodiment. This is a well-known small-capacity battery charging system that charges the battery 4 from the solar cell 1 through the overcharge prevention device 111 having a shunt control type control unit.

The short-circuit switch 115 is driven by the output of the hysteresis comparator 113 which is an abnormality detecting means.
Specifically, when the battery voltage is higher than the value obtained by adding the hysteresis voltage width to the reference voltage output from the reference voltage generator 114, the short-circuit switch 115 is turned on, and similarly, the value is smaller than the value obtained by subtracting the hysteresis voltage width from the reference voltage. The basic operation is to turn off when the battery voltage is low. Here, (error) consolidated display means 1 which is a means for consolidating and displaying errors
Reference numeral 16 is configured to monitor the output of the hysteresis comparator 113. The ON time is indicated as "overvoltage", and the OFF time is indicated as "charging", and is recorded by the storage means. Here, reference numeral 112 denotes a backflow prevention device.

Here, when it is assumed that the battery 4 is disconnected, it is known that the short-circuit switch 115 repeatedly performs an ON / OFF operation in a short time. Therefore, in the present embodiment, when "overvoltage" and "charging" are repeated in a short time, the collective display of "battery disconnected" is performed. Thus, even a user without specialized knowledge can recognize that the user has forgotten to attach the battery 4 or the like.

As described above, even in an independent system, the present embodiment can provide an effect.

[0058]

As described above, the present invention has the following effects. (1) Since a plurality of errors are displayed in a single display, the user can easily understand the display according to the actual situation. (2) A memory saving effect can be expected by performing single recording of a plurality of errors. (3) By adopting state information, accurate service correspondence is possible. Also, it is possible to know the downtime, which is effective for managing the life of the grid-connected inverter (such as a capacitor) and estimating a decrease in the amount of power generation. The industrial utility value of the present invention having the above excellent effects is high.

[Brief description of the drawings]

FIG. 1 is a diagram showing components of a control unit used in a grid interconnection inverter according to an embodiment of the present invention.

FIG. 2 is a diagram showing a typical operation flow of an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration example of a system interconnection inverter according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a specific example of a control unit in FIG. 3;

FIG. 5 is a diagram illustrating a structure of error data used in the first embodiment.

FIG. 6 is a diagram illustrating a processing flow of a part related to error processing used in the first embodiment.

FIG. 7 is a diagram illustrating an operation flow of a part related to state information recording of a system interconnection inverter according to a second embodiment.

FIG. 8 is a diagram illustrating a schematic operation flow of a notebook computer as an analysis (aggregation) unit according to the second embodiment.

FIG. 9 is a diagram showing an operation flow of a data analysis and error display part of FIG. 8;

FIG. 10 is a display example of a display unit according to the second embodiment.

FIG. 11 is a schematic configuration diagram of a battery charging system used in a third embodiment.

FIG. 12 is a diagram showing a specific example of abnormality detection means for detecting an error factor.

[Explanation of symbols]

Ev: error factor, El, E2, E3: abnormality detection means (information), E11: (abnormal) detection information, C: aggregation means,
D: display means, I: control unit, S: storage means, b0, b
1, b2, b3, b4, b5, b6, b7: bit contents of parallel port, 1: solar cell, 2: commercial power system,
3: system interconnection inverter, 4: battery, 30: overcharge prevention device, 31: DC / AC converter, 32: DC voltage detector, 33: DC current detector, 34: AC voltage detector, 3
5: AC current detection unit, 36: control unit, 41: undervoltage detection element, 42: underfrequency detection element, 43: aggregation unit,
44: parallel port, 45, 47, 48: AND circuit, 46: NOT circuit, 111: overcharge protection device, 11
2: backflow prevention device, 113: hysteresis comparator, 114: reference voltage generator, 115: short circuit means, 1
16: (error) consolidated display means, 121: monitoring target, 1
22: monitoring target detecting means, 123: reference value generating means,
124: comparison means.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02M 7/48 H02M 7/48 RF term (reference) 5G003 AA06 BA01 CA11 CC04 EA02 5G053 BA01 BA04 DA03 EA01 EB01 5G066 HA13 HB06 5H007 AA12 AA17 BB07 DB12 DC02 DC04 DC05 FA01 FA04 5H420 CC03 DD03 EB26 FF03 FF04 FF10 FF25 FF28 LL02 LL03 LL05 LL09 LL10

Claims (15)

[Claims] 1. A system comprising a DC / AC converter, a DC voltage detector, a DC current detector, an AC voltage detector, a part or all of an AC current detector, and a controller having a computer and a real-time clock. In the interconnection inverter, the control unit includes a nonvolatile storage unit that records information, a display unit that displays the information to a user, and a plurality of abnormality detection units that detect an abnormality as abnormality detection information over a plurality of monitoring items. And an aggregation unit that aggregates a plurality of pieces of abnormality detection information detected from the plurality of abnormality detection units derived from the same cause as a single piece of abnormality information and generates the aggregated abnormality information as one piece of detection information. A grid-connected inverter characterized in that: 2. The system interconnection inverter according to claim 1, wherein the control unit displays the detection information generated by the aggregation unit to a user on the display unit. 3. The system interconnection inverter according to claim 1, wherein the control unit records the detection information generated by the aggregation unit in the nonvolatile storage unit. 4. The non-volatile storage unit according to claim 1, wherein the control unit records state information, which is information on a state of the grid interconnection inverter, including the abnormality detection information and time information, in the nonvolatile storage unit. Grid-connected inverter. 5. The control unit includes state information analysis means for analyzing state information of the grid-connected inverter, wherein the state information recorded in the nonvolatile storage means is analyzed by the state information analysis means, and The information obtained as a result is displayed on the display means.
The grid-connected inverter described in 1. 6. The apparatus according to claim 1, wherein said status information recorded in said nonvolatile storage means is recorded as data having a bit width of 2 bits or more. Grid-connected inverter. 7. The control unit calculates a loss of a power generation amount during a power outage period from the state information recorded in the non-volatile storage unit by the state information analysis unit, and displays the loss on the display unit. The grid-connected inverter according to claim 1. 8. A method of connecting a plurality of solar cell modules in series and / or
Or a solar cell array that performs photoelectric conversion by connecting in parallel, and a load that consumes output power of the solar cell array,
A DC-AC conversion unit, a DC voltage detection unit, a DC current detection unit, an AC voltage detection unit, a part or all of the AC current detection unit, and a system interconnection inverter having a control unit including a computer and a real-time clock, In the photovoltaic power generation system, the control unit includes a nonvolatile storage unit that records information, a display unit that displays the information to a user, and a plurality of units that detect an error as error detection information over a plurality of monitoring items. Abnormality detection means, and aggregation means for integrating a plurality of abnormality detection information detected from the plurality of abnormality detection means derived from the same cause as a single abnormality information and generating the aggregated abnormality information as one piece of detection information A photovoltaic power generation system comprising: 9. The solar power generation system according to claim 8, wherein the control unit displays the detection information generated by the aggregation unit to a user on the display unit. 10. The photovoltaic power generation system according to claim 8, wherein the control unit records the detection information generated by the aggregation unit in the nonvolatile storage unit. 11. The apparatus according to claim 8, wherein the control unit records state information, which is information on the state of the photovoltaic power generation system including the abnormality detection information and time information, in a nonvolatile storage unit. Solar power system. 12. The control unit includes state information analysis means for analyzing state information of the photovoltaic power generation system, wherein the state information recorded in the nonvolatile storage means is analyzed by the state information analysis means, The photovoltaic power generation system according to claim 8, wherein information obtained as a result is displayed on the display unit. 13. The status information recorded in the non-volatile storage means is recorded as data having a bit width of 2 bits or more.
A solar power generation system according to any one of the above. 14. The apparatus according to claim 1, wherein said state information analysis means calculates a power generation loss during a power outage period from said state information recorded in said nonvolatile storage means, and displays the loss on said display means. A solar power generation system according to any one of 8 to 13. 15. An overcharge prevention system comprising: a solar cell array for performing photoelectric conversion by connecting a plurality of solar cell modules in series and / or in parallel; and a control unit for charging a battery with electric power from the solar cell array. In the battery charging system including a device, the overcharge prevention device, the aggregation display means to aggregate and display the detection information, storage means to record the display content by the aggregation display means, and error factors as abnormality detection information A battery charging system comprising: abnormality detection means for detecting abnormality.