CN102355002A - Device and system for protecting islanding effect in isolated-type grid-connected power generation - Google Patents
Device and system for protecting islanding effect in isolated-type grid-connected power generation Download PDFInfo
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- CN102355002A CN102355002A CN2011102624114A CN201110262411A CN102355002A CN 102355002 A CN102355002 A CN 102355002A CN 2011102624114 A CN2011102624114 A CN 2011102624114A CN 201110262411 A CN201110262411 A CN 201110262411A CN 102355002 A CN102355002 A CN 102355002A
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Abstract
The invention discloses a device and system for protecting an islanding effect in the isolated-type grid-connected power generation, belonging to the technical field of grid-connected power generation. The device is characterized in that: an islanding effect monitoring device is arranged at the low-voltage input end and connected to an islanding effect protection controller through a serial communication bus; a user load is connected to the rear end of the islanding effect monitoring device through a bus; a user-side low-voltage renewable energy source grid is connected to the rear end of the islanding effect monitoring device through a mechanical switch; and a mechanical switch and the user-side low-voltage renewable energy source grid are respectively connected to the islanding effect protection controller. The system disclosed by the invention is controlled by the islanding effect protection controller; before an inverter performs normal grid-connected working, the islanding effect monitoring device begins to monitor a rate signal input by the grid in real time; and the signal is input to the islanding effect protection controller to control the switch-on and switch-off of the grid. The device and system disclosed by the invention have the advantages of simpleness for operation, practical functions, safety, stability, good real-time performance and high detection precision.
Description
Technical field
The invention belongs to the technical field of generating electricity by way of merging two or more grid systems, particularly a kind ofly be used for preventing that the process of generating electricity by way of merging two or more grid systems from producing the device of island effect, also relate to the system that it prevents island effect in addition.
Background technology
Since the seventies in last century; The idea of sustainable development progressively becomes international community's common recognition; The regenerative resource development and use receive countries in the world and pay much attention to; Many countries will develop the important component part of regenerative resource as energy strategy; Clear and definite regenerative resource developing goal has been proposed; The law and the policy of encouraging the regenerative resource development have been formulated; Regenerative resource is developed rapidly; Its technical merit improves constantly; Industry size enlarges gradually, becomes to promote energy variation and the important energy source that realizes sustainable development.
The generating of the regenerative resource energy is as one of important safely cleaning energy; Comprise water ability, biomass energy, wind energy, solar energy, geothermal energy and oceanic energy etc.; Resource potential is big; Environmental pollution is low; But continuous utilization; Can with himself conversion or human development and utilization not be successively decreased and sustainable supply, be the important energy source that helps the harmony between man and nature development.
Renewable energy power generation development now is swift and violent, mainly comprises:
Hydroelectric power generation will be to the end of the year 2010, and China's water power total installation of generating capacity reaches 2.13 hundred million kilowatts, water power annual energy output 6863 hundred million kWh.At present, developed country's hydraulic power potentials is developed basically and is finished, and construction of hydropower facilities mainly concentrates on developing country.
Biomass power generation comprises agricultural-forestry biomass generating, wastes-to-power generation and biogas power generation etc.To the end of the year 2010, the whole nation all kinds of biomass power generations installation of being constructed and put into operation adds up to about 6,700,000 kW, bagasse 1,700,000 kW that generate electricity wherein, stalk forest tree castoff 2,260,000 kW that generate electricity, municipal refuse 2,230,000 kW that generate electricity, biogas and landfill gas power generation 500,000 kW.
Wind-powered electricity generation comprises small-sized wind power generator group and the large-scale wind power generator incorporated in power network group from network operation, and technology is mature on the whole.In recent years, the single-machine capacity of grid connected wind power unit constantly increases, rough estimates, and the newly-increased wind-powered electricity generation lifting in 2010 and the operation capacity that is incorporated into the power networks reach 1,800 ten thousand and 1,350 ten thousand kW respectively; To the end of the year 2010, national wind-powered electricity generation accumulative total lifting capacity is respectively 4,400 ten thousand kW and 3,100 ten thousand kW with the operation capacity that is incorporated into the power networks; About 50,000,000,000 kWh of national wind-powered electricity generation electricity volume in 2010.
Solar energy power generating is initial to be used as decentralized power s independently, the trend pickup of grid-connected photovoltaic power generation in recent years, and market capacity has surpassed the independent dispersion photo-voltaic power supply that uses.Rough estimates, China's newly-increased grid-connected photovoltaic power generation in 2010 530000 kW that install, the accumulative total installation reaches 830,000 kW, its medium-and-large-sized grid-connected photovoltaic power generation accumulative total 700,000 kW that install, architecture-integral grid-connected photovoltaic power generation about 130,000 kW that install.The newly-increased installation in 2010 of photovoltaic generation market, the whole world is estimated to increase on year-on-year basis to surpass 120%, reaches more than 1,700 ten thousand kW, drives China's photovoltaic industry size and enlarges rapidly.
In a word; Renewable energy power generation is incorporated into the power networks becomes a kind of trend; But in renewable energy power generation and network process; When electrical network breaks down; Can produce island effect; Island effect is meant when inverter is incorporated into the power networks work; Because a variety of causes causes civil power can not give local electric; If have no the isolated island judgment technology this moment; Inverter can continue to local load and partial electric grid electric; In general, island effect possibly cause adverse influence to the equipment of whole power distribution system equipment and user side, comprising:
1) harm electric power maintenance personal's life security;
2) influence protection switch operation program on the distribution system;
3) the regional supply power voltage that is taken place of isolated island and the unstable character of frequency can be brought destruction to power consumption equipment;
4) voltage-phase that when service restoration, causes is asynchronous will produce surge current, may cause tripping operation once more or load and electric power system are brought damage;
5) grid-connected system is owed the phase powerup issue because of what single phase power supply caused system's threephase load.
Summary of the invention
The present invention overcomes above-mentioned not enough problem; A kind of Apparatus and system of the isolated island effect protection of generating electricity by way of merging two or more grid systems is provided; Simple in structure; Easy operating; Initiatively real-time monitor signal; Thereby the cut-out and the connection of control electrical network have reached the purpose that prevents island effect, have satisfied renewable energy power generation safety, stable requirement of being incorporated into the power networks.
The present invention for realizing the technical scheme that above-mentioned purpose adopted is: the device that a kind of isolated island effect protection of generating electricity by way of merging two or more grid systems is provided.The device of the said isolated island effect protection of generating electricity by way of merging two or more grid systems comprises that island effect defense controls device, user side low pressure regenerative resource are incorporated into the power networks, mechanical switch, customer charge, island effect monitoring device, low pressure input, transformer, high voltage input terminal.
Said transformer front end is connected in high voltage input terminal; The low pressure input is connected in the transformer rear end; The island effect monitoring device is installed on the low pressure input; The island effect monitoring device is connected with island effect defense controls device through serial communication bus; Customer charge is connected in island effect monitoring device rear end through bus; User side low pressure regenerative resource is incorporated into the power networks and is connected to island effect monitoring device rear end through mechanical switch, and mechanical switch is incorporated into the power networks with user side low pressure regenerative resource and is connected with island effect defense controls device through serial communication bus respectively.
Said user side low pressure regenerative resource is incorporated into the power networks and comprises that solar grid-connected, wind energy is incorporated into the power networks, geothermal energy is incorporated into the power networks, biomass energy is incorporated into the power networks, oceanic energy is incorporated into the power networks and/or water can be incorporated into the power networks.
The said solar grid-connected header box that passes through is connected with inverter, and storage battery is serially connected with between inverter and the header box, and header box is connected with solar panel, and inverter is connected with island effect defense controls device through serial communication bus.
Said island effect defense controls device inside is equipped with capacitor and control circuit system.
The present invention provides a kind of system of the isolated island effect protection of generating electricity by way of merging two or more grid systems in addition; Said isolated system of generating electricity by way of merging two or more grid systems the island effect protection is controlled by island effect defense controls device; Before inverter normally is incorporated into the power networks work; The island effect monitoring device begins to monitor in real time voltage, electric current, phase place, the frequency signal of electrical network input, and signal is input to island effect defense controls device inside through serial communication bus:
When electrical network interrupts; The island effect monitoring device monitors the signal of the generation of electrical network interruption; Island effect defense controls device sends the cut-out command signal immediately, is transferred to mechanical switch and inverter respectively through serial communication bus, and the user side regenerative resource is incorporated into the power networks by automatic cut-out;
During power system restoration; The island effect monitoring device can monitor electrical network input voltage, electric current, phase place, frequency signal; Island effect defense controls device sends the connection command signal immediately; Be transferred to mechanical switch and inverter respectively through serial communication bus, the user side regenerative resource is incorporated into the power networks by automatic connection.
Said island effect monitoring device is monitored electrical network input voltage, electric current, phase place, frequency signal in real time, and the monitoring frequency is 0.5s/ time-1s/ time in the time of in fact.
Description of drawings
Fig. 1 is the apparatus structure sketch map of the isolated island effect protection of generating electricity by way of merging two or more grid systems of the present invention.
Among the figure, 1. island effect defense controls device, 2. serial communication bus; 3. inverter, 4. header box, 5. solar panel; 6. storage battery; 7. mechanical switch, 8. user load, 9. bus; 10. island effect monitoring device; 11. the low pressure input, 12. transformers, 13. high voltage input terminal.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Embodiment 1
The generate electricity by way of merging two or more grid systems device of island effect protection of a kind of isolated shown in accompanying drawing 1 comprises that island effect defense controls device 1, user side low pressure regenerative resource are incorporated into the power networks, mechanical switch 7, customer charge 8, island effect monitoring device 10, low pressure input 11, transformer 12, high voltage input terminal 13.
Transformer 12 front ends are connected on the high voltage input terminal 13; Low pressure input 11 is connected in transformer 12 rear ends; Island effect monitoring device 10 is installed on low pressure input 11; Island effect monitoring device 10 is connected on the island effect defense controls device 1 by serial communication bus 2; Customer charge 8 is connected in island effect monitoring device 10 rear ends by bus 9; User side low pressure regenerative resource is incorporated into the power networks and is connected on island effect monitoring device 10 rear ends by mechanical switch 7, and mechanical switch 7 is incorporated into the power networks with user side low pressure regenerative resource and receives mutually on the island effect defense controls device 1 by serial communication bus 2 respectively.
When user side low pressure regenerative resource is incorporated into the power networks when solar grid-connected; Solar grid-connected employing header box 4 is connected on the inverter 3; Storage battery 6 is connected between inverter 3 and the header box 4; Header box is connected on the solar panel 5, and inverter 3 is connected on the island effect defense controls device 1 through serial communication bus 2.
Island effect defense controls device 1 inside is equipped with capacitor and control circuit system.
A kind of system of the isolated island effect protection of generating electricity by way of merging two or more grid systems; System is by 1 control of island effect defense controls device; Before inverter 3 normally is incorporated into the power networks work; 10 beginnings of island effect monitoring device are voltage, electric current, phase place, the frequency signal of the input of monitoring electrical network in real time; The monitoring frequency is 0.5s/ time in real time; Signal is input to island effect defense controls device 1 inside through serial communication bus
When electrical network interrupts; Island effect monitoring device 10 can monitor the signal of the generation of electrical network interruption; Island effect defense controls device 1 sends the cut-out command signal immediately, is transferred to mechanical switch 7 and inverter 3 respectively through serial communication bus 2, and solar grid-connected quilt cuts off automatically.
Embodiment 2
The generate electricity by way of merging two or more grid systems device of island effect protection of a kind of isolated shown in accompanying drawing 1 comprises that island effect defense controls device 1, user side low pressure regenerative resource are incorporated into the power networks, mechanical switch 7, customer charge 8, island effect monitoring device 10, low pressure input 11, transformer 12, high voltage input terminal 13.
Transformer 12 front ends are connected on the high voltage input terminal 13; Low pressure input 11 is connected in transformer 12 rear ends; Island effect monitoring device 10 is installed on low pressure input 11; Island effect monitoring device 10 is connected on the island effect defense controls device 1 by serial communication bus 2; Customer charge 8 is connected in island effect monitoring device 10 rear ends by bus 12; User side low pressure regenerative resource is incorporated into the power networks and is connected on island effect monitoring device 10 rear ends by mechanical switch 7, and mechanical switch 7 is incorporated into the power networks with user side low pressure regenerative resource and receives mutually on the island effect defense controls device 1 by serial communication bus 2 respectively.
When user side low pressure regenerative resource is incorporated into the power networks when solar grid-connected; Solar grid-connected employing header box 4 is connected on the inverter 3; Storage battery 6 is connected between inverter 3 and the header box 4; Header box is connected on the solar panel 5, and inverter 3 is connected on the island effect defense controls device 1 through serial communication bus 2.
Island effect defense controls device 1 inside is equipped with capacitor and control circuit system.
A kind of system of the isolated island effect protection of generating electricity by way of merging two or more grid systems; System is by 1 control of island effect defense controls device; Before inverter 3 normally is incorporated into the power networks work; 10 beginnings of island effect monitoring device are voltage, electric current, phase place, the frequency signal of the input of monitoring electrical network in real time; The monitoring frequency is 0.5s/ time in real time; Signal is input to island effect defense controls device 1 inside through serial communication bus
During power system restoration; Island effect monitoring device 10 can monitor electrical network input voltage, electric current, phase place, frequency signal; Island effect defense controls device 1 sends the connection command signal immediately; Be transferred to mechanical switch 7 and inverter 3 respectively through serial communication bus 2, solar grid-connected quilt is connected automatically.
Above content is to combine optimal technical scheme to the further explain that the present invention did, and can not assert that the practical implementation of invention only limits to these explanations.Under the present invention, the those of ordinary skill of technical field, under the prerequisite that does not break away from design of the present invention, simple deduction and replacement can also be made, all protection scope of the present invention should be considered as.
Claims (6)
1. the device of the isolated island effect protection of generating electricity by way of merging two or more grid systems; It is characterized in that: the device of the said isolated island effect protection of generating electricity by way of merging two or more grid systems comprises that island effect defense controls device (1), user side low pressure regenerative resource are incorporated into the power networks, mechanical switch (7), customer charge (8), island effect monitoring device (10), low pressure input (11), transformer (12), high voltage input terminal (13)
Said transformer (12) front end is connected in high voltage input terminal (13); Low pressure input (11) is connected in transformer (12) rear end; Island effect monitoring device (10) is installed on low pressure input (11); Island effect monitoring device (10) is connected with island effect defense controls device (1) by serial communication bus (2); Customer charge (8) is connected in island effect monitoring device (10) rear end by bus (9); User side low pressure regenerative resource is incorporated into the power networks and is connected to island effect monitoring device (10) rear end by mechanical switch (7), and mechanical switch (7) is incorporated into the power networks with user side low pressure regenerative resource and is connected with island effect defense controls device (1) by serial communication bus (2) respectively.
2. the device of a kind of isolated island effect protection of generating electricity by way of merging two or more grid systems according to claim 1, it is characterized in that: said user side low pressure regenerative resource is incorporated into the power networks and comprises that solar grid-connected, wind energy is incorporated into the power networks, geothermal energy is incorporated into the power networks, biomass energy is incorporated into the power networks, oceanic energy is incorporated into the power networks and/or water can be incorporated into the power networks.
3. the device of a kind of isolated island effect protection of generating electricity by way of merging two or more grid systems according to claim 2; It is characterized in that: the said solar grid-connected header box (4) that passes through is connected with inverter (3); Storage battery (6) is serially connected with between inverter (3) and the header box (4); Header box (4) is connected with solar panel (5), and inverter (3) is connected with island effect defense controls device (1) through serial communication bus (2).
4. according to the device of claim 1 or 3 described a kind of isolated island effect protection of generating electricity by way of merging two or more grid systems, it is characterized in that: said island effect defense controls device (1) inside is equipped with capacitor and control circuit system.
5. the system of the isolated island effect protection of generating electricity by way of merging two or more grid systems; It is characterized in that: said isolated system of generating electricity by way of merging two or more grid systems the island effect protection is controlled by island effect defense controls device (1); Before inverter (3) normally is incorporated into the power networks work; Island effect monitoring device (10) beginning is voltage, electric current, phase place, the frequency signal of the input of monitoring electrical network in real time, and signal is input to island effect defense controls device (1) inside through serial communication bus:
When electrical network interrupts; Island effect monitoring device (10) monitors the signal of the generation of electrical network interruption; Island effect defense controls device (1) sends the cut-out command signal immediately; Be transferred to mechanical switch (7) and inverter (3) respectively through serial communication bus (2), the user side regenerative resource is incorporated into the power networks by automatic cut-out;
During power system restoration; Island effect monitoring device (10) can monitor electrical network input voltage, electric current, phase place, frequency signal; Island effect defense controls device (1) sends the connection command signal immediately; Be transferred to mechanical switch (7) and inverter (3) respectively through serial communication bus (2), the user side regenerative resource is incorporated into the power networks by automatic connection.
6. the system of a kind of isolated island effect protection of generating electricity by way of merging two or more grid systems according to claim 5; It is characterized in that: said island effect monitoring device (10) is monitored electrical network input voltage, electric current, phase place, frequency signal in real time, and the monitoring frequency is 0.5s/ time-1s/ time in the time of in fact.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110248926 | 2011-08-28 | ||
| CN201110248926.9 | 2011-08-28 | ||
| CN2011102624114A CN102355002A (en) | 2011-08-28 | 2011-09-07 | Device and system for protecting islanding effect in isolated-type grid-connected power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102624114A CN102355002A (en) | 2011-08-28 | 2011-09-07 | Device and system for protecting islanding effect in isolated-type grid-connected power generation |
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| CN102355002A true CN102355002A (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102624114A Pending CN102355002A (en) | 2011-08-28 | 2011-09-07 | Device and system for protecting islanding effect in isolated-type grid-connected power generation |
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| CN (1) | CN102355002A (en) |
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Application publication date: 20120215 |