CN111316555A - Power conversion device and power generation system - Google Patents
Power conversion device and power generation system Download PDFInfo
- Publication number
- CN111316555A CN111316555A CN201880056876.4A CN201880056876A CN111316555A CN 111316555 A CN111316555 A CN 111316555A CN 201880056876 A CN201880056876 A CN 201880056876A CN 111316555 A CN111316555 A CN 111316555A
- Authority
- CN
- China
- Prior art keywords
- resistor
- detection circuit
- insulation distance
- power
- securing element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 40
- 238000010248 power generation Methods 0.000 title claims description 27
- 238000009413 insulation Methods 0.000 claims abstract description 134
- 238000001514 detection method Methods 0.000 claims abstract description 132
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Inverter Devices (AREA)
Abstract
The power conversion device includes: a detection circuit that detects an insulation resistance value on a negative electrode side and an insulation resistance value on a positive electrode side of the direct-current power supply; and an insulation distance securing element provided between the detection circuit and the ground point for securing an insulation distance between the detection circuit and the ground point.
Description
Technical Field
The present invention relates to a power converter, and more particularly to a power converter and a power generation system including a detection circuit for detecting an insulation resistance value on a negative electrode side and an insulation resistance value on a positive electrode side of a dc power supply.
Background
Conventionally, a ground fault detection device including a detection unit that detects a ground fault (insulation resistance value) of a dc power supply is known. Such a ground fault detection device is disclosed in, for example, japanese patent laid-open No. 2012-119382.
Japanese patent application laid-open No. 2012-119382 discloses a solar cell system including: a solar cell string configured by connecting a plurality of solar cell modules in series; and a solar cell array configured by connecting solar cells in series and parallel. In the solar cell system, a switch unit is provided to electrically disconnect the solar cell array or the solar cell string (hereinafter, referred to as a dc power supply) from the solar cell system. In addition, the solar cell system is provided with a detection unit that detects a ground fault of the dc power supply in a state where the dc power supply is electrically disconnected from the solar cell system.
In japanese patent laid-open publication No. 2012-119382, the detection section includes: the detection resistor is arranged between the direct current power supply and the grounding point; and a voltage detector connected to one side (dc power supply side) and the other side (ground point) of the detection resistor, and detecting a voltage drop between the one side and the other side of the detection resistor. The voltage detector detects a voltage drop between one side and the other side of the detection resistor in a state where the positive electrode side of the direct-current power supply is electrically connected to the ground point. The voltage detector detects a voltage drop between one side and the other side of the detection resistor in a state where the negative electrode side of the dc power supply is electrically connected to the ground point. Then, based on the results of these voltage drops, the insulation resistance value is calculated. Further, the presence or absence of a ground fault is detected based on the insulation resistance value.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2012-119382
Disclosure of Invention
Problems to be solved by the invention
However, since the voltage detector of japanese patent application laid-open No. 2012-119382 is connected to the other side (ground point) of the detection resistor, the insulation distance between the voltage detector and the ground point is considered to be relatively small (the potential of the voltage detector is close to the ground potential). Therefore, it is necessary to ensure a relatively large insulation distance between the voltage detector and other devices. Therefore, there is a problem that the device becomes large because other devices cannot be disposed in the vicinity of the voltage detector (detection circuit).
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power conversion device and a power generation system that can suppress an increase in size of the device due to the inability to dispose another device in the vicinity of a detection circuit for detecting an insulation resistance value.
Means for solving the problems
In order to achieve the above object, a power conversion device according to a first aspect of the present invention includes: a power conversion unit that converts dc power supplied from a dc power supply into ac power; a detection circuit provided between the dc power supply and the power conversion unit, for detecting an insulation resistance value on a positive electrode side and an insulation resistance value on a negative electrode side of the dc power supply; and an insulation distance securing element provided between the detection circuit and the ground point for securing an insulation distance between the detection circuit and the ground point.
In the power converter according to the first aspect of the present invention, as described above, the power converter includes the insulation distance securing element provided between the detection circuit and the ground point for securing the insulation distance between the detection circuit and the ground point. Thus, the insulation distance between the detection circuit and the ground point can be secured, and therefore the potential of the detection circuit becomes a potential different from the ground potential. As a result, the insulation distance required between the detection circuit and another device becomes relatively small, and therefore, another device can be disposed in the vicinity of the detection circuit. This can prevent the size of the apparatus from becoming large because another device cannot be disposed in the vicinity of the detection circuit for detecting the insulation resistance value.
In the power converter according to the first aspect, the insulation distance securing element preferably includes a chip resistor having a pair of terminals and a resistor body provided between the pair of terminals. With such a configuration, the insulation distance can be easily ensured by utilizing the space (distance) between the pair of terminals of the chip resistor.
In this case, it is preferable that the insulation distance securing element includes a plurality of chip resistors connected in series with each other. With such a configuration, even when the insulation distance cannot be sufficiently ensured by 1 chip resistor, the insulation distance can be sufficiently ensured by a plurality of chip resistors connected in series.
In the power conversion device including the plurality of chip resistors connected in series, it is preferable that the plurality of chip resistors are arranged in a linear shape. With such a configuration, unlike a state in which the plurality of chip resistors connected in series are not linear (curved or the like), the distance between one end and the other end of the plurality of chip resistors connected in series is relatively large, and therefore, the insulation distance can be effectively ensured.
In the power converter in which the insulation distance securing element includes a chip resistor, it is preferable that the power converter further include: a first resistor provided between the detection circuit and the positive electrode side of the direct current power supply; and a second resistor provided between the detection circuit and the negative electrode side of the DC power supply, wherein the insulation distance securing element, the first resistor, and the second resistor are formed by the same chip resistor. With such a configuration, the number of types of components constituting the power conversion device can be reduced as compared with a case where the first resistor, the second resistor, and the insulation distance securing element are formed of different elements.
In this case, it is preferable that the detection circuit further includes a detection resistor provided between the first resistor and the second resistor and the insulation distance securing element formed of the chip resistor, the detection resistor having a resistance value smaller than the resistance values of the first resistor, the second resistor, and the insulation distance securing element formed of the chip resistor, and the detection circuit is configured to detect a voltage across the detection resistor. With such a configuration, even when the insulation resistance value is relatively small, the voltage across the detection resistor having a relatively small resistance value can be easily detected by the detection circuit.
In the power converter according to the first aspect, the insulation distance securing element is preferably configured to secure an insulation distance between the detection circuit and the ground point such that a potential of the detection circuit with respect to the ground point is electrically floating. With such a configuration, the potential of the detection circuit with respect to the ground point is electrically floating, and therefore, other devices can be disposed in the vicinity of the detection circuit with the insulation distance being substantially zero.
A power generation system according to a second aspect of the present invention includes a power generation unit that generates power using natural energy, and a power conversion device that converts power supplied from the power generation unit, the power conversion device including: a power conversion unit that converts the dc power supplied from the power generation unit into ac power; a detection circuit provided between the power generation unit and the power conversion unit, the detection circuit detecting an insulation resistance value on a positive electrode side and an insulation resistance value on a negative electrode side of the power generation unit; and an insulation distance securing element provided between the detection circuit and the ground point for securing an insulation distance between the detection circuit and the ground point.
In the power generation system according to the second aspect of the present invention, as described above, the insulation distance securing element provided between the detection circuit and the ground point for securing the insulation distance between the detection circuit and the ground point is included. Thus, the insulation distance between the detection circuit and the ground point can be secured, and therefore the potential of the detection circuit becomes a potential different from the ground potential. As a result, the insulation distance required between the detection circuit and another device becomes relatively small, and therefore, another device can be disposed in the vicinity of the detection circuit. Thus, it is possible to provide a power generation system capable of suppressing an increase in size of the device due to the inability to dispose another device in the vicinity of the detection circuit for detecting the insulation resistance value.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, as described above, it is possible to suppress an increase in size of the apparatus due to the inability to dispose another device in the vicinity of the detection circuit for detecting the insulation resistance value.
Drawings
Fig. 1 is a schematic diagram (1) showing the configuration of a power generation system according to the present embodiment.
Fig. 2 is a schematic diagram (2) showing the configuration of the power generation system according to the present embodiment.
Fig. 3 is a circuit diagram showing a configuration of a power conversion device (insulation resistance detection unit) according to the present embodiment.
Fig. 4 is a schematic diagram showing a structure of a chip resistor according to the present embodiment.
Detailed Description
Hereinafter, embodiments embodying the present invention will be described based on the drawings.
[ present embodiment ]
The configuration of the power generation system 100 (power conversion device 20) according to the present embodiment will be described with reference to fig. 1 to 4.
As shown in fig. 1 and 2, the power generation system 100 includes a solar panel 10 that generates power using natural energy. The solar panel 10 is an example of the "power generation unit" and the "dc power supply" in the claims.
The power generation system 100 further includes a power conversion device 20 (inverter) that converts the electric power supplied from the solar panel 10. The power conversion device 20 includes a direct current/alternating current (DC/AC) conversion unit 21 that converts DC power supplied from the solar panel 10 into AC power. The ac power converted by the dc/ac converter 21 is supplied to the system 201 via the transformer 200. In addition, the transformer 200 may not be provided. The dc/ac converter 21 is an example of a "power converter" in the claims.
The power converter 20 includes an insulation resistance detection unit 30 provided on the input side (solar panel 10 side) of the dc/ac conversion unit 21. The insulation resistance detection unit 30 includes a detection circuit (voltage detection circuit) 31, a relay 32, a relay 33, a first resistor 34, a second resistor 35, an insulation distance securing element 36, and a detection resistor 37. The following specifically explains the process.
The detection circuit 31 is provided between the solar panel 10 and the dc/ac conversion unit 21. The detection circuit 31 is configured to detect the insulation resistance value on the positive side and the insulation resistance value on the negative side of the solar panel 10. Specifically, the relay 32 is provided between the detection circuit 31 and the wiring 41 connecting the positive electrode side (high-voltage positive electrode side P) of the solar panel 10 and the dc/ac converter 21. Further, a relay 33 is provided between the detection circuit 31 and a wiring 42 connecting the negative electrode side (high-voltage negative electrode side N) of the solar panel 10 and the dc/ac conversion unit 21. In addition, the input side and the output side of the relay 32 (relay 33) are insulated.
In addition, as shown in fig. 3, the detection circuit 31 includes an isolation amplifier 31 a. The isolation amplifier 31a is an amplifier in which an input portion and an output portion are insulated. Further, a power supply circuit 51 for supplying power to the isolation amplifier 31a is provided. The power supply circuit 51 is configured to supply power to an input side (a side connected to a detection resistor 37 described later) of the isolation amplifier 31 a.
As shown in fig. 1 and 2, the power conversion device 20 (insulation resistance detection unit 30) includes a first resistor 34 provided between the detection circuit 31 and the positive electrode side (relay 32) of the solar panel 10. The power conversion device 20 (insulation resistance detection unit 30) includes a second resistor 35 provided between the detection circuit 31 and the negative electrode side (relay 33) of the solar panel 10. The first resistor 34 and the second resistor 35 are connected to each other. Further, the relay 32, the first resistor 34, the second resistor 35, and the relay 33 are connected in series in this order.
The power conversion device 20 (insulation resistance detection unit 30) includes a detection resistor 37 provided between the first resistor 34 and the second resistor 35 and an insulation distance securing element 36 described later. Specifically, the detection resistor 37 is provided between a connection point of the first resistor 34 and the second resistor 35 and an insulation distance securing element 36 described later. The detection circuit 31 is configured to detect a voltage across the detection resistor 37.
Here, in the present embodiment, the power conversion device 20 (insulation resistance detection unit 30) includes the insulation distance securing element 36, and the insulation distance securing element 36 is provided between the detection circuit 31 and the ground point to secure the insulation distance between the detection circuit 31 and the ground point. Specifically, as shown in fig. 3, the insulation distance securing element 36 includes a plurality of chip resistors 60 connected in series with each other. As shown in fig. 4, the chip resistor 60 includes a pair of terminals 61 and a resistor 62 provided between the pair of terminals 61. Further, a distance L between the pair of terminals 61 corresponds to an insulation distance.
In the present embodiment, as shown in fig. 3, a plurality of (5) chip resistors 60 are linearly arranged. Thus, the insulation distance ensuring element 36 ensures an insulation distance corresponding to the length of L × 5 of the distance between the pair of terminals 61. The insulation distance securing element 36 is configured to secure an insulation distance between the detection circuit 31 and a ground point so that the detection circuit 31 is electrically floating. For example, the detection circuit 31 is electrically floating with respect to the ground point by securing an insulation distance corresponding to the length of the distance L × 5 by 5 chip resistors 60.
In the present embodiment, the insulation distance securing element 36, the first resistor 34, and the second resistor 35 are formed by the same chip resistor 60. Specifically, the first resistor 34 is constituted by a plurality of (5) chip resistors 60 connected in series (arranged in a linear shape) similarly to the insulation distance securing element 36. Similarly to the insulation distance securing element 36, the second resistor 35 is composed of a plurality of (5) chip resistors 60 connected in series (arranged in a linear shape). Thus, the first resistor 34 ensures an insulation distance between the detection circuit 31 and the positive electrode side of the solar panel 10. In addition, the second resistor 35 ensures an insulation distance between the detection circuit 31 and the negative electrode side of the solar panel 10.
In the present embodiment, the resistance value of the detection resistor 37 is smaller than the resistance values of the first resistor 34, the second resistor 35, and the insulation distance securing element 36 constituted by the chip resistor 60. Specifically, the resistance value of the detection resistor 37 is several hundred Ω, and the resistance values of the first resistor 34, the second resistor 35, and the insulation distance securing element 36 are several M Ω, respectively. These resistance values are examples, and the respective resistance values are not limited to the above resistance values.
As shown in fig. 3, other devices other than the detection circuit 31, such as the control circuit 70, are disposed in the vicinity of the detection circuit 31. Further, a power supply circuit 52 for supplying power to other devices such as the control circuit 70 is provided. Here, when the insulation distance securing element 36 is not provided, the potential of the detection circuit 31 (power supply circuit 51) is close to the ground potential, and therefore a predetermined insulation distance needs to be secured between the power supply circuit 51 and the power supply circuit 52. On the other hand, in the present embodiment, since the insulation distance securing element 36 is provided, the potential of the detection circuit 31 (power supply circuit 51) becomes a floating potential (electrically floating state), and thus the insulation distance between the power supply circuit 51 and the power supply circuit 52 can be shortened. The power supply circuit 51 and the power supply circuit 52 are formed of, for example, transformers, and the transformers can be made smaller by shortening the insulation distance between the power supply circuit 51 and the power supply circuit 52.
Next, the operation of the insulation resistance detection unit 30 will be described with reference to fig. 1 and 2.
As shown in fig. 1, the relay 32 is turned off, and the relay 33 is turned on. Thus, the ground fault current Ig flows from the positive electrode side of the solar panel 10 to the negative electrode side of the solar panel 10 through the ground point, the insulation distance securing element 36, the detection resistor 37, the second resistor 35, and the relay 33. The voltage value of the ground fault current Ig is detected by the detection circuit 31. The insulation resistance value Rg is obtained based on the voltage value, and the ground fault on the positive electrode side of the solar panel 10 is detected based on the insulation resistance value Rg.
As shown in fig. 2, the relay 32 is turned on, and the relay 33 is turned off. Thus, the ground fault current Ig flows from the positive electrode side of the solar panel 10 to the negative electrode side of the solar panel 10 via the relay 32, the first resistor 34, the detection resistor 37, the insulation distance securing element 36, and the ground point. The voltage value of the ground fault current Ig is detected by the detection circuit 31. The insulation resistance value Rg is obtained based on the voltage value, and the ground fault on the negative electrode side of the solar panel 10 is detected based on the insulation resistance value Rg.
[ Effect of the present embodiment ]
In the present embodiment, the following effects can be obtained.
In the present embodiment, as described above, the insulation distance securing element 36 is provided, and the insulation distance securing element 36 is provided between the detection circuit 31 and the ground point to secure the insulation distance between the detection circuit 31 and the ground point. Accordingly, since the insulation distance between the detection circuit 31 and the ground point can be secured, the potential of the detection circuit 31 becomes a potential different from the ground potential. As a result, the insulation distance required between the detection circuit 31 and another device becomes relatively small, and therefore, another device can be disposed in the vicinity of the detection circuit 31. This can suppress an increase in size of the apparatus due to the inability to dispose another device in the vicinity of the detection circuit 31 for detecting the insulation resistance value.
In the present embodiment, as described above, the insulation distance securing element 36 includes the chip resistor 60, and the chip resistor 60 includes the pair of terminals 61 and the resistor provided between the pair of terminals 61. This makes it possible to easily secure an insulation distance by using a space (distance L) between the pair of terminals 61 of the chip resistor 60.
In addition, in the present embodiment, as described above, the insulation distance securing element 36 includes the plurality of chip resistors 60 connected in series with each other. Thus, even when the insulation distance cannot be sufficiently ensured by 1 chip resistor 60, the insulation distance can be sufficiently ensured by a plurality of chip resistors 60 connected in series.
In the present embodiment, as described above, the plurality of chip resistors 60 are arranged in a linear shape. Thus, unlike a state in which the plurality of chip resistors 60 connected in series with each other are not linear (curved or the like), the distance between one end and the other end of the plurality of chip resistors 60 connected in series with each other is relatively large, and therefore, the insulation distance can be effectively ensured.
In the present embodiment, as described above, the insulation distance securing element 36, the first resistor 34, and the second resistor 35 are formed by the same chip resistor 60. Accordingly, the types of components constituting the power conversion device 20 can be reduced as compared with a case where the first resistor 34, the second resistor 35, and the insulation distance securing element 36 are formed of different elements.
In the present embodiment, as described above, the resistance value of the detection resistor 37 is smaller than the resistance values of the first resistor 34, the second resistor 35, and the insulation distance securing element 36 formed of the chip resistor 60, and the detection circuit 31 is configured to detect the voltage across the detection resistor 37. Thus, even when the insulation resistance value is relatively small, the voltage across the detection resistor 37 having a relatively small resistance value can be easily detected by the detection circuit 31.
In the present embodiment, as described above, the insulation distance securing element 36 secures an insulation distance between the detection circuit 31 and the ground point so that the potential of the detection circuit 31 is electrically floating with respect to the ground point. Thus, since the potential of the detection circuit 31 with respect to the ground point is electrically floating, it is possible to dispose other devices in the vicinity of the detection circuit 31 in a state where the insulation distance is substantially zero.
[ modified examples ]
In addition, it should be understood that all the points of the embodiments disclosed herein are illustrative and not restrictive. The scope of the present invention is shown by the claims, not by the description of the above embodiments, and includes all modifications (variations) within the meaning and scope equivalent to the claims.
For example, although the above-described embodiment shows an example in which the insulation distance securing element is formed of a chip resistor, the present invention is not limited thereto. For example, the insulation distance securing element may be formed of an element other than a chip resistor such as a diode or a zener diode.
In the above-described embodiment, the example in which the insulation distance securing element is configured by a plurality of chip resistors is shown, but the present invention is not limited to this. For example, if the insulation distance can be sufficiently ensured by using 1 chip resistor, the insulation distance ensuring element may be constituted by 1 chip resistor.
In the above-described embodiment, the example in which the plurality of chip resistors are arranged in a linear shape is shown, but the present invention is not limited to this. For example, if the insulation distance can be sufficiently secured, the plurality of chip resistors may be arranged in a shape other than a straight shape such as a curved shape.
In the above-described embodiment, the first resistor, the second resistor, and the insulation distance securing element are formed of the same chip resistor, but the present invention is not limited to this. In the present invention, even if the first resistor, the second resistor, and the insulation distance securing element are formed by different elements (resistors), the insulation distance required between the detection circuit and another device can be made relatively small.
In the above-described embodiments, the example in which the insulation distance between the detection circuit and the ground point is secured so that the potential of the detection circuit with respect to the ground point is electrically floating has been described, but the present invention is not limited to this. For example, even if the potential of the detection circuit is not electrically floating with respect to the ground point, the insulation distance required between the detection circuit and another device can be shortened by making the potential of the detection circuit distant from the potential of the ground point by the insulation distance securing element.
In the above-described embodiments, the solar panel is used as the "dc power supply" of the present invention, but the present invention is not limited to this. For example, as the "dc power supply" of the present invention, a dc power supply other than a solar panel such as a wind power generator may be used.
Description of the reference numerals
10: a solar panel (a direct-current power supply and a power generation unit); 20: a power conversion device; 21: a dc/ac converter (power converter); 31: a detection circuit; 34: a first resistor; 35: a second resistor; 36: an insulation distance ensuring element; 37: a resistance for detection; 60: a chip resistor; 61: a terminal; 62: a resistor body; 100: a power generation system.
Claims (8)
1. A power conversion device is provided with:
a power conversion unit that converts dc power supplied from a dc power supply into ac power;
a detection circuit provided between the dc power supply and the power conversion unit, the detection circuit detecting an insulation resistance value on a positive electrode side and an insulation resistance value on a negative electrode side of the dc power supply; and
and an insulation distance securing element provided between the detection circuit and a ground point for securing an insulation distance between the detection circuit and the ground point.
2. The power conversion device according to claim 1,
the insulation distance securing element includes a chip resistor having a pair of terminals and a resistor body provided between the pair of terminals.
3. The power conversion device according to claim 2,
the insulation distance securing element includes a plurality of the chip resistors connected in series with each other.
4. The power conversion device according to claim 3,
the plurality of chip resistors are arranged in a linear shape.
5. The power conversion device according to any one of claims 2 to 4, further comprising:
a first resistor provided between the detection circuit and a positive electrode side of the dc power supply; and
a second resistor provided between the detection circuit and a negative electrode side of the DC power supply,
the insulation distance securing element, the first resistor, and the second resistor are formed by the same chip resistor.
6. The power conversion device according to claim 5,
further comprising a detection resistor provided between the first resistor and the second resistor and the insulation distance securing element formed by the chip resistor,
the resistance value of the detection resistor is smaller than the resistance values of the first resistor, the second resistor, and the insulation distance securing element formed by the chip resistor,
the detection circuit is configured to detect a voltage across the detection resistor.
7. The power conversion device according to any one of claims 1 to 6,
the insulation distance securing element is configured to secure an insulation distance between the detection circuit and the ground point so that a potential of the detection circuit with respect to the ground point is electrically floating.
8. A power generation system is provided, which comprises a power generation unit,
comprises a power generation unit for generating power by using natural energy, and a power conversion device for converting power supplied from the power generation unit,
the power conversion device includes:
a power conversion unit that converts the dc power supplied from the power generation unit into ac power;
a detection circuit provided between the power generation unit and the power conversion unit, the detection circuit detecting an insulation resistance value on a positive electrode side and an insulation resistance value on a negative electrode side of the power generation unit; and
and an insulation distance securing element provided between the detection circuit and a ground point for securing an insulation distance between the detection circuit and the ground point.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/036113 WO2020065879A1 (en) | 2018-09-27 | 2018-09-27 | Power conversion device and a power generation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111316555A true CN111316555A (en) | 2020-06-19 |
| CN111316555B CN111316555B (en) | 2023-06-23 |
Family
ID=69949638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880056876.4A Active CN111316555B (en) | 2018-09-27 | 2018-09-27 | Power conversion device and power generation system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6919765B2 (en) |
| CN (1) | CN111316555B (en) |
| WO (1) | WO2020065879A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010150601A1 (en) * | 2009-06-22 | 2010-12-29 | 新日本石油株式会社 | Insulation resistance measurement device and insulation resistance measurement method |
| CA2730849A1 (en) * | 2010-02-05 | 2011-08-05 | Omicron Electronics Gmbh | Method and device for evaluating an electrical installation of an electrical power system |
| JP2011155736A (en) * | 2010-01-26 | 2011-08-11 | Sharp Corp | Inverter device and power supply system |
| JP2014207381A (en) * | 2013-04-15 | 2014-10-30 | 株式会社ケーヒン | Serial circuit device |
| JP2016101012A (en) * | 2014-11-21 | 2016-05-30 | オムロン株式会社 | Ground fault detector and ground fault detection method |
-
2018
- 2018-09-27 WO PCT/JP2018/036113 patent/WO2020065879A1/en active Application Filing
- 2018-09-27 JP JP2020511825A patent/JP6919765B2/en active Active
- 2018-09-27 CN CN201880056876.4A patent/CN111316555B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010150601A1 (en) * | 2009-06-22 | 2010-12-29 | 新日本石油株式会社 | Insulation resistance measurement device and insulation resistance measurement method |
| JP2011155736A (en) * | 2010-01-26 | 2011-08-11 | Sharp Corp | Inverter device and power supply system |
| CA2730849A1 (en) * | 2010-02-05 | 2011-08-05 | Omicron Electronics Gmbh | Method and device for evaluating an electrical installation of an electrical power system |
| JP2014207381A (en) * | 2013-04-15 | 2014-10-30 | 株式会社ケーヒン | Serial circuit device |
| JP2016101012A (en) * | 2014-11-21 | 2016-05-30 | オムロン株式会社 | Ground fault detector and ground fault detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111316555B (en) | 2023-06-23 |
| WO2020065879A1 (en) | 2020-04-02 |
| JPWO2020065879A1 (en) | 2021-01-07 |
| JP6919765B2 (en) | 2021-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10734944B2 (en) | Inverter having grid disconnection point and insulation resistance measurement and method for measuring an insulation resistance | |
| US8373308B2 (en) | Device and method for generating alternating current | |
| US10680443B2 (en) | Solar power generation system | |
| US8717719B2 (en) | Inverter, power generation system and method of operating a power generation system | |
| EP3264550B1 (en) | Access control method for parallel direct current power supplies and device thereof | |
| CN109167390B (en) | Photovoltaic power generation inverter system | |
| US20180233902A1 (en) | Ground fault detection device, communication device, method for controlling same, load device, switch and non-transitory computer-readable recording medium | |
| CN103140931B (en) | Be used for the circuit arrangement of the electromotive force of setting photovoltaic generator | |
| CN104065285A (en) | Grid-connected inverter system | |
| US20200136383A1 (en) | Inverter with at least two direct converters | |
| CN109245711B (en) | Photovoltaic system safety protection equipment | |
| JP2017201868A (en) | Fail-safe disconnection junction box for photovoltaic power generation assembly and power system | |
| EP2849325B1 (en) | Inverter for photovoltaic modules | |
| US11784494B2 (en) | Direct current power supply system, photovoltaic system, energy storage system, and optical storage system | |
| CN111316555B (en) | Power conversion device and power generation system | |
| CN107230997A (en) | A kind of photovoltaic generating system | |
| CN116087624A (en) | Ground impedance detection device, method and inverter | |
| CN110797907A (en) | Photovoltaic system with safety protection function | |
| JP5950084B2 (en) | Condition monitoring device | |
| CN101777855A (en) | Solar power plant | |
| CN105529945B (en) | single-phase photovoltaic inverter | |
| JP2015216787A (en) | Power converter, and power conversion system comprising the same | |
| JP3208537U (en) | Solar power system | |
| KR101051257B1 (en) | Photovoltaic power generation system and DC fuse fault detection device that can detect DC fuse faults | |
| CN203445626U (en) | Solar power generation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |