JPH07143655A - Dispersed power supply system - Google Patents

Abstract

PURPOSE:To easily perform maintenance inspection operation of a dispersed power supply system and at the same time readily discover the abnormality and failure. CONSTITUTION:An inverter 3 converts DC input from a solar cell 2 into AC output for testing and then feeds it to a protective device 4 when testing the protective device 4 and a testing instrument 7 reads the output of the protective device 4 to diagnose the protective device 4, thus eliminating the need for feeding a large amount of electricity for testing from the testing instrument to the protective device, miniaturizing the testing instrument and easily performing maintenance inspection operation, and easily performing maintenance inspection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed power supply system that operates in cooperation with a system power supply, and more specifically,
Regarding its maintenance and inspection.

[0002]

2. Description of the Related Art In recent years, a distributed power source such as a solar power generation system and a system power source (commercial power source) are interconnected, and when the distributed power source cannot supply the power, the system side supplies the power. Systems have been developed.

[0003] Figure 13 shows an example of such a system, reference numeral 1 ₀ is a distributed power supply, the distributed power supply 1 ₀ includes a solar cell 2, DC power from the solar battery 2 And an inverter 3 ₀ for converting the AC power into AC power. 4 when the occurred some kind of accident protection device to disconnect the connection between the distribution line and the dispersed power source 1 _0, 5 home load, 6 is a distribution board.

[0004] Maintenance of the protective device 4 and the inverter 3 ₀ such distributed power supply system is performed as follows. That is, in the test of the protection device 4, the test device 5
0 is connected to the protective device 4, the tester 50 supplies a test electric quantity to the protective device 4, and the output from the protective device 4 is taken in to diagnose whether or not it is operating normally. in the test of _0, the tester 50 connected to the inverter 3 _0, is diagnostic of whether operating normally captures the output of the inverter 3 _0.

FIG. 14 is a flow chart showing the procedure of maintenance and inspection of the conventional protective device.

First, the test method / standard is confirmed (step n1), the wiring between the tester 50 and the protection device 4 is prepared (step n2), and the amount of electricity for testing given from the tester 50 is set. (Step n3), test (Step n)
4) The result is confirmed (step n5), and it is judged whether or not all the test items are completed (step n6). When completed, the wiring is returned to the original state (step n7) and the process is completed.

[0007]

However, in the conventional example in which the tester supplies the protective device with the test electric quantity to perform the maintenance and inspection as described above, it is necessary to give a large value of the electric quantity. The transformer and power supply section of the tester 50 must be large, and the tester 50 becomes large and difficult to handle.
On-site testing is not easy, and the frequency of maintenance and inspection using such a large-sized tester 50 is also limited, and failures or abnormalities in the distributed power supply system can be detected early. The difficulty is that

The present invention has been made in view of the above points, and makes it possible to easily perform maintenance and inspection work of a distributed power supply system, and to detect an abnormality or a failure thereof at an early stage. The purpose is to

[0009]

In order to achieve the above-mentioned object, the present invention is constructed as follows.

That is, according to the first aspect of the present invention, a distributed power source having a power generation means such as a solar cell and an inverter for converting a DC input from the power generation means into an AC output, and the distributed power source when required. In a distributed power supply system that is operated in cooperation with the system power supply, wherein the inverter is for testing the DC input from the power generation means at the time of testing the protection device. It includes a conversion circuit for converting the AC output to the protection device.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the inverter stores a test method including test items and test conditions, and
It has a storage unit for storing standard values such as operating time and operating value, and provides an AC output for testing to the protection device according to the test method, and captures the output of the protection device for the AC output for testing. The protection device is diagnosed based on the standard value.

According to the third aspect of the present invention, a distributed power source having a power generation means such as a solar cell and an inverter for converting a direct current input from the power generation means into an alternating current output, and the distributed power supply system when required. In a distributed power supply system that includes a protection device that is disconnected from a power supply and that is operated in cooperation with the system power supply, the inverter is a protection device for another distributed power supply system that is operated in cooperation with the system power supply. In the test (1), it includes a conversion circuit for converting the DC input from the power generation means into the AC output for the test and giving it to the protection device of the another distributed power supply system.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, a test method including test items and test conditions is recorded on the inverter, and
A recording medium on which a standard value such as an operating time or an operating value is recorded is configured to be insertable / removable, and an AC output for testing is given to a protective device according to the test method of the recording medium. The output of the protection device is taken in and the protection device is diagnosed based on the standard value.

According to a fifth aspect of the present invention, in addition to the configuration according to the first aspect, the inverter receives data of a test method including a test item and a test condition, and the operation time and the operation time. Having a receiving means for receiving standard value data such as a value, providing a test AC output to the protection device according to the received test method, and capturing the output of the protection device for the test AC output, The protection device is diagnosed based on the standard value.

[0015]

According to the present invention as set forth in claim 1, the inverter constituting the distributed power supply system converts the direct current input from the power generation means into an alternating current output for the test when the protective device is tested. Since it is applied to the device, it is not necessary to supply the electric quantity for testing from the tester as in the conventional example, and the maintenance and inspection system including the tester is simplified and the work is facilitated.

According to the second aspect of the present invention, the inverter provides the tester with an AC output for testing according to the test method stored in the storage unit, and at the same time, based on the standard value stored in the storage unit. Since the protective device is diagnosed by using the tester, it is not necessary to use a tester, and therefore, the protective device can be maintained and inspected more frequently than in the conventional example.

According to the present invention as set forth in claim 3, the inverter of the distributed power supply system is operated by the power generation means at the time of testing the protection device of another distributed power supply system which is operated in cooperation with the system power supply. Since the DC input of the above is converted to an AC output for testing and given to the protection device of the other distributed power system, maintenance of the system is performed by using the time when the other distributed power system is stopped. You will be able to inspect.

According to the fourth aspect of the present invention, the inverter provides the protective device with the alternating current output for the test according to the test method recorded on the recording medium which can be inserted into and removed from the inverter, and at the same time, the recording medium. Since the protective device is diagnosed based on the recorded standard value, it is not necessary to use a tester, and therefore, the protective device can be maintained and inspected more frequently than in the conventional example, and further, it is used. The test method and standard value can be easily changed depending on the recording medium.

According to the fifth aspect of the present invention, the inverter provides the protection AC device with a test AC output according to the received test method, and diagnoses the protection device based on the received standard value. Since it is not necessary to use a tester, maintenance and inspection of the protective device can be performed more frequently than in the conventional example, and further, maintenance can be performed by remotely controlling the inverter.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a distributed power supply system according to an embodiment of the present invention during maintenance and inspection.

In the figure, reference numeral 1 is a distributed power supply, and this distributed power supply 1 comprises a solar cell 2 and an inverter 3 for converting DC power from the solar cell 2 into AC power. Reference numeral 4 is a protective device for disconnecting the connection between the distribution line and the distributed power source 1 when some accident occurs, 5 is a home load, and 6 is a distribution board.

In this embodiment, the tester 7 for testing the protection device 4 and the inverter 3 is downsized to facilitate portability and simplify maintenance and inspection work. Under the control of the tester 7, the DC input from the solar cell 2 is converted into a test AC output, which is output to the protection device 4 as a test signal.
Takes in the output of the protection device 4 and diagnoses whether or not the protection device 4 is operating normally. In addition,
In addition to the test of the protection device 4, the tester 7 also appropriately fetches the output of the inverter 3 to diagnose whether the inverter 3 is operating normally.

FIG. 2 is a block diagram of the inverter 3 and the tester 7 of the embodiment shown in FIG. The inverter 3 includes an input circuit 8 to which a DC input from the solar cell 2 is applied, a conversion circuit 9 that converts this DC input into an AC output, an output circuit 10 that provides an AC output to the protection device 4, and a normal operation. Setting circuit 11 for setting the time condition and this setting circuit 1
An arithmetic circuit 1 that controls the conversion circuit 9 based on the output of 0.
2 and a display circuit 13 for displaying setting conditions and test results
It has and.

On the other hand, the tester 7 includes a test setting circuit 14 for setting test data such as test items and test conditions, and test data such as operating time and standard values such as operating values.
By controlling the conversion circuit 9 of the inverter 3 based on the data of the test setting circuit 14, the inverter 3
From the AC output for the test to the protection device 4,
The test arithmetic circuit 15 is provided for diagnosing whether or not the protection device 4 is normal by taking in the output of the protection device 4 and comparing it with the standard value.

The test arithmetic circuit 15 also properly takes in the AC output of the inverter 3 and compares it with a standard value to diagnose whether the inverter 3 is operating normally. When it is determined that the inverter 3 is not operating normally, the fact is displayed by the display circuit 13 of the inverter 3.

FIG. 3 is a flow chart at the time of testing the protection device 4 in this embodiment.

First, the tester 7 outputs a test signal output command corresponding to the test item to the inverter 3 (step n1), and the inverter 3 accordingly tests the DC input from the solar cell 2 for testing. Protective device 4 by converting to AC output
(Step n2), the protection device 4 operates in response to the AC output for this test, and gives a corresponding output (step n3), and the tester 7 captures the output and compares it with the standard value. Diagnosis is performed (step n4), and it is determined whether or not all the test items have been completed (step n5). If not completed, the process returns to step n1, and when completed, the test result is recorded, or The data is output to the display circuit 13 of the inverter 3 (step n6), and the process ends.

As described above, the inverter 3 has the protection device 4
At the time of the test, the direct current input from the solar cell 2 is converted into the alternating current output for the test and given to the protection device 4, so that, as in the conventional example, the tester sends the protection device 4 a large electric power for the test. It is not necessary to give a quantity, which allows the tester 7
Is small and lightweight, which makes it easy to handle and simplifies maintenance and inspection work.

Although the tester 7 and the inverter 3 are separate bodies in the above-described embodiment, as another embodiment of the present invention, the function of the tester 7 may be incorporated in the inverter 3. Of course, in this case, the protection device 4 can be tested by using the nighttime when the distributed power source 1 is not operated, and the operation of the distributed power source 1 is not stopped,
Maintenance and inspection can be performed daily. Therefore, the abnormality or failure can be detected earlier than in the conventional example.

FIG. 4 is a schematic configuration diagram of another embodiment of the present invention, in which parts corresponding to the above-mentioned embodiments are designated by the same reference numerals.

In this embodiment, two distributed power sources 1a and 1b are provided in one home, and the inverter 3a (3b) of each system is controlled by the tester 20 to protect the other system. An alternating current output for a test is applied to each of 4b (4a), and the tests are always performed alternately.

FIG. 5 shows each inverter 3 of the embodiment of FIG.
It is a block diagram of a, 3b and the tester 20, and shows a state in which one system is stopped and the other system is being tested.

In this embodiment, each inverter 3a, 3b is
Are switch circuits 21a and 21b that are on / off controlled by the tester 20, and the switch circuit 21
The input circuits 22a and 22b to which the DC input from the solar cells 2a and 2b is given via a and 21b, the conversion circuits 23a and 23b which convert this DC input into the AC output, and the AC to the protection devices 4b and 4a. Output circuit 24 for giving output
a and 24b respectively, and each conversion circuit 23
The a and 23b are configured to be able to give a test AC output to the other protective device 4b and 4a under the control of the tester 20.

On the other hand, the tester 20 includes a setting circuit 25 in which the conditions of normal operation of each system are set, and based on the output of the setting circuit 25, a conversion circuit 23a,
An arithmetic circuit 26 for controlling 23b, a display circuit 27 for displaying setting conditions and test results, a test method such as test items and test conditions, and test data such as standard values such as operating time and operating values are set. A test setting circuit 28,
By controlling the switch circuits 22a and 22b and the conversion circuits 23a and 23b of the inverters 3a and 3b based on the data of the test setting circuit 28, one inverter 3a (3b) outputs the test AC output to the other. And a test arithmetic circuit 29 for diagnosing the protection device 4b (4a) by capturing the output of the protection device 4b (4a) for the protection device 4b (4a) and comparing it with a standard value. There is.

In FIG. 5, one distributed power source 1
The switch circuit 22a of the system a is turned off to be in the stopped state, the system of the other distributed power supply 1b is in the operating state, and the converter circuit 23b of the inverter 3b in the operating state is controlled to protect the system 4a of the one system. On the other hand, an AC output for testing is given through the output circuit 24a of one system, and the output of the protection device 4a for it is taken into the tester 20 to diagnose the protection device 4a. At this time, the conversion circuit 23b of the other system gives a normal AC output to the protection device 4b via the output circuit 24b, and the other system is operating normally. If it is determined that the protection device 4a of one system is normal, the switch circuit 22a of one system is turned on to start normal operation,
Inverter 3
Diagnose a.

Thereafter, the other distributed power source 1b is similarly processed.
The system is tested.

That is, in this embodiment, as shown in the flow chart of FIG. 6, a test is performed by applying a test AC output from the inverter 3a of one system to the protection device 4b of the other system (step n1). Next, a test AC output is applied from the inverter 3b of the other system to the protection device 4a of the one system to perform a test (step n2), and this is repeated alternately.

Since the test is always performed in this manner, it is possible to detect a failure or abnormality of the protective devices 4a, 4b and the inverters 3a, 3b at an early stage.

Further, by testing one system using the other system in this way, it is possible to effectively utilize the time when one system is in a stopped state to perform the test.

As another embodiment of the present invention, the test may be conducted only at night. Furthermore, the tester 20 of this embodiment is provided with one of the inverters 3a (3b).
It may be configured to be built in.

Although this embodiment is applied to a plurality of distributed power supply systems in one home, as another embodiment of the present invention, as shown in FIG. 7, the distributed power supply systems of adjacent homes are connected to each other. May be applied to.

In each of the above-mentioned embodiments, the test data such as the test method and the standard value is configured to be set in the tester. However, as another embodiment of the present invention, the ROM in which the test data is written is written. For example, as shown in FIG. 8, the built-in cartridge 30 is configured so that it can be inserted into and removed from the tester 7 or an inverter with a built-in tester, and the tester 7 or the inverter is used for testing the ROM of the inserted cartridge 30. The data may be read and the test may be performed as in the above-described embodiment.

FIG. 9 is a flow chart for explaining the operation of this embodiment.
Write test data in advance to the OM (step n1),
The cartridge 30 is inserted into the tester 7 or an inverter with a built-in tester (step n2), and the tester 7 or the inverter reads the test data from the ROM (step n3), and the CPU of the tester 7 or the inverter is read.
Outputs a test command according to the test data (step n4), executes the test as in the above-described embodiment (step n5), and outputs the test result to, for example, the cartridge 30.
Is recorded in the recording area (step n6), and it is determined whether or not all the test items have been completed (step n7). If not completed, the process returns to step n4, and if completed, an end signal is output ( Step n8).

As described above, since the test data in the ROM of the cartridge 30 is read and the test is performed, when the test method or the standard value is changed, the cartridge 30 is changed.
It can be easily dealt with by replacing.

FIG. 10 is a block diagram of another embodiment of the present invention. In FIG. 10, reference numeral 31 is an inverter with a built-in tester, and this inverter 31 has a communication means built therein. The test data and the test result are communicated with the operation terminal 32 connected to.

FIG. 11 is a flow chart for explaining the operation of this embodiment. First, the test data such as the test method and the standard value is transmitted from the operation terminal 32 (step n).
1) Further, a test start signal is transmitted (step n).
2). The inverter 31 with a built-in tester receives them and starts the test as in the above-described embodiment (step n).
3) The test result is displayed on the display circuit and transmitted to the operation terminal 32 (step n4), and it is judged whether or not all the test items have been completed (step n5). When the process returns to n3 and ends, the end signal is transmitted to the operation terminal 32 and the process ends (step n6).

By using the communication means in this way,
It enables maintenance and inspection from a remote location.

FIG. 12 is a block diagram of still another embodiment of the present invention. In FIG. 12, 33 is an inverter with a built-in tester, and this inverter 33 has a remote control signal receiving means. The test is performed according to the signal from the remote control transmitter 34.

Since the inverter 33 is installed at a high place or a distant place, maintenance and inspection can be performed by remote control operation, which simplifies the operation.

In each of the above-mentioned embodiments, the inverter and the protection device are separate bodies, but as another embodiment of the present invention, the protection device may be incorporated in the inverter.

Further, in each of the above-mentioned embodiments, the solar cell is used as the power generation means, but the present invention is not limited to the solar cell, and is similarly applicable to other power generation means such as wind power and fuel cells. Of course.

[0053]

As described above, according to the present invention, the inverter constituting the distributed power supply system converts the direct current input from the power generation means into the alternating current output for the test when the protective device is tested. Therefore, unlike the conventional example, it is not necessary to supply an electric quantity for testing from the tester, the tester can be made compact and lightweight, and the work becomes easy.

By incorporating a tester in the inverter, maintenance and inspection can be performed more frequently than in the conventional example, and an abnormality or failure of the system can be detected earlier.

Since a plurality of distributed systems can test the other system, the test can be performed while the system is in a stopped state.

Since the test is performed and the diagnosis is performed on the basis of the test data recorded on the removable recording medium,
It will be possible to easily respond to changes in test methods and standard values.

By incorporating the receiving means in the inverter, maintenance and inspection can be remotely controlled.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

2 is a block diagram of an inverter and a tester of the embodiment of FIG.

FIG. 3 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 4 is a schematic configuration diagram of another embodiment of the present invention.

5 is a block diagram of an inverter and a tester of the embodiment of FIG.

6 is a flowchart for explaining the operation of the embodiment in FIG.

FIG. 7 is a schematic configuration diagram of another embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of another embodiment of the present invention.

9 is a flowchart for explaining the operation of the embodiment in FIG.

FIG. 10 is a schematic configuration diagram of another embodiment of the present invention.

11 is a flowchart for explaining the operation of the embodiment in FIG.

FIG. 12 is a schematic configuration diagram of another embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of a conventional example.

FIG. 14 is a flowchart for explaining the operation of the conventional example.

[Explanation of symbols]

 1, 1a, 1b Distributed power supply 2, 2a, 2b Solar cell 3, 3a, 3b, 31, 33 Inverter 4, 4a, 4b Protective device 7, 20 Tester

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor ▲ Yoshi ▼ Kiyokazu Mura Kiyokazu 10 Ouron Co., Ltd.

Claims (5)

[Claims] 1. A distributed power supply having a power generation means such as a solar cell and an inverter for converting a DC input from the power generation means into an AC output, and a protection device for disconnecting the distributed power supply from a system power supply when required. In the distributed power supply system that is operated in cooperation with the system power supply, the inverter converts a DC input from the power generation unit into an AC output for testing and gives the protection device when the protection device is tested. A distributed power supply system comprising a conversion circuit. 2. The inverter stores a test method including test items and test conditions, and has a storage unit that stores standard values such as an operating time and an operating value. 2. The distributed power supply according to claim 1, wherein an AC output is given to a protection device, and the output of the protection device for the AC output for the test is taken in to diagnose the protection device based on the standard value. system. 3. A distributed power supply having a power generation means such as a solar cell and an inverter for converting a DC input from the power generation means into an AC output, and a protection device for disconnecting the distributed power supply from a system power supply when required. In the distributed power supply system that is operated in cooperation with the system power supply, the inverter may be operated from the power generation means during a test of a protection device of another distributed power supply system that is operated in cooperation with the system power supply. A distributed power supply system, comprising: a conversion circuit that converts a DC input into an AC output for testing and supplies it to a protection device of the other distributed power supply system. 4. A recording medium in which a test method including test items and test conditions is recorded and a standard value such as an operating time and an operating value is recorded in the inverter is configured to be insertable and removable. The test AC output is applied to a protection device according to the test method of claim 1, and the output of the protection device with respect to the test AC output is captured to diagnose the protection device based on the standard value. The distributed power supply system according to item 1. 5. The inverter has receiving means for receiving data of a test method including a test item and a test condition, and data of a standard value such as an operating time and an operating value, and the received test method. The test AC output is given to the protection device according to the above-mentioned method, and the output of the protection device corresponding to the test AC output is taken in to diagnose the protection device based on the standard value.
The distributed power supply system according to the item.