CN202076783U - Islanding detection device for string photovoltaic micro-inverter - Google Patents
Islanding detection device for string photovoltaic micro-inverter Download PDFInfo
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- CN202076783U CN202076783U CN2011200375288U CN201120037528U CN202076783U CN 202076783 U CN202076783 U CN 202076783U CN 2011200375288 U CN2011200375288 U CN 2011200375288U CN 201120037528 U CN201120037528 U CN 201120037528U CN 202076783 U CN202076783 U CN 202076783U
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- inverter
- detection device
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- islanding detection
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Abstract
The utility model provides an islanding detection device for a string photovoltaic micro-inverter, which comprises a photovoltaic component, a micro-inverter, an islanding detection device and a chaining relay. The islanding detection device is connected between the chaining relay and a power network, an output of the photovoltaic component is connected with an input of the micro-inverter, and an output of the micro-inverter is connected with the chaining relay. In actual mounting of the islanding detection device, a plurality of inverter modules are serially connected into the power network, the fact that each inverter module is loaded with an islanding detection device is not needed, and only the inverter closest to the power network is loaded with the islanding detection device. Additionally, the chaining relay is added into the inverter so that the power network and the rear inverter can be cut off, when the power network is powered off, the islanding effect can be detected by the inverter so as to cut off a network combination relay and the chaining relay, and thereby actual generated energy is increased, and interference of the power network is reduced.
Description
Technical field
The utility model relates to the photovoltaic power generation technology field, particularly a kind of group of little inverter island detection of string data photovoltaic device.
Background technology
The little inverter of group string data photovoltaic, direct and the single photovoltaic module of inverter is integrated, be that each photovoltaic module is equipped with an inverter module that possesses AC-DC conversion function and MPPT maximum power point tracking function separately, the electric energy that photovoltaic module is sent is directly changed into AC energy for the AC load use or be transferred to electrical network.
The detection method of island effect generally can be divided into passive type and active two classes, and it is to detect grid-connected system output end voltage state that passive type detects, and judges as parameters such as voltage, frequencies whether electrical network has a power failure; And active detection is meant the combining inverter active, periodically electrical network is applied some interference signals, because electrical network can be regarded an infinitely-great voltage source as, the every index by detection of grid judges whether to have taken place island effect then.
Traditional group string data photovoltaic DC-to-AC converter island detection is to load an island detection device at each piece inverter.
The detection method of island effect generally adopts initiatively phase shift method at present, active frequency displacement method, reactive power compensation method.But no matter take what method, two kinds of disadvantages are all arranged: power is lossy; Electrical network there is interference.
The utility model content
The purpose of this utility model is in order to address the above problem, a kind of group of little inverter island detection of string data photovoltaic device to be provided, and this device can increase the actual power amount, reduces the interference of electrical network.。
In order to achieve the above object, the technical scheme that the utility model provides is: a kind of group of little inverter island detection of string data photovoltaic device has photovoltaic module, little inverter, island checkout gear and link connecting relay; The island checkout gear is connected between link connecting relay and the electrical network; The output of photovoltaic module connects the input of little inverter; The output of little inverter connects link connecting relay;
Photovoltaic module and little inverter be integrated to become inverter module;
The quantity of inverter module is more than or equal to 1; When the quantity of inverter module during greater than 1, the link link connecting relay of connecting between the output of inverter module.
In the utility model actual installation, 10 to 15 (a plurality of) inverter modules are cascaded, insert electrical network again, do not need each piece inverter module to load an island detection device, only the inverter of close electrical network loads the island detection device, simultaneously, in this part inverter, increase a link connecting relay, can disconnect electrical network and back inverter.When outage appearred in electrical network, this inverter detected island effect, will disconnect and network relay and link connecting relay; Increase the actual power amount like this, reduce the interference of electrical network.
Description of drawings:
Fig. 1: structural representation of the present utility model.
Embodiment:
Embodiment 1:
As shown in Figure 1, a kind of group of little inverter island detection of string data photovoltaic device has photovoltaic module 1, little inverter 2, island checkout gear 3 and link connecting relay 4; Island checkout gear 3 is connected between link connecting relay 4 and the electrical network; The output of photovoltaic module 1 connects the input of little inverter 2; The output of little inverter 3 connects link connecting relay 4;
Photovoltaic module 1 and little inverter 2 be integrated to become inverter module 5; (certainly, can not integrate yet, but occur in pairs)
When 3 of the quantity of inverter module 5, the link link connecting relay 4 of connecting between the output of inverter module 5.
In the utility model actual installation, 3 (a plurality of) inverter modules are cascaded, insert electrical network again, do not need each piece inverter module to load an island detection device, only the inverter of close electrical network loads the island detection device, simultaneously, in this part inverter, increase a link connecting relay, can disconnect electrical network and back inverter.When outage appearred in electrical network, this inverter detected island effect, will disconnect and network relay and link connecting relay; Increase the actual power amount like this, reduce the interference of electrical network.
Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.
Claims (3)
1. organize the little inverter island detection of string data photovoltaic device for one kind, it is characterized in that: this device has photovoltaic module, little inverter, island checkout gear and link connecting relay; Described island checkout gear is connected between described link connecting relay and the electrical network; The output of described photovoltaic module connects the input of described little inverter; The output of described little inverter connects described link connecting relay.
2. the according to claim 1 group of little inverter island detection of string data photovoltaic device is characterized in that: described photovoltaic module and little inverter be integrated to become inverter module.
3. the according to claim 2 group of little inverter island detection of string data photovoltaic device, it is characterized in that: the quantity of described inverter module is more than or equal to 1; When the quantity of inverter module during greater than 1, the described link connecting relay of the link of connecting between the output of inverter module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200375288U CN202076783U (en) | 2011-02-14 | 2011-02-14 | Islanding detection device for string photovoltaic micro-inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200375288U CN202076783U (en) | 2011-02-14 | 2011-02-14 | Islanding detection device for string photovoltaic micro-inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202076783U true CN202076783U (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200375288U Expired - Fee Related CN202076783U (en) | 2011-02-14 | 2011-02-14 | Islanding detection device for string photovoltaic micro-inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202076783U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221917A (en) * | 2017-05-27 | 2017-09-29 | 中国能源建设集团甘肃省电力设计院有限公司 | A kind of centralized photovoltaic plant islet operation detecting method |
-
2011
- 2011-02-14 CN CN2011200375288U patent/CN202076783U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221917A (en) * | 2017-05-27 | 2017-09-29 | 中国能源建设集团甘肃省电力设计院有限公司 | A kind of centralized photovoltaic plant islet operation detecting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20190214 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |