CN104333042A - Energy storage current transformer grid connection and grid disconnection seamless switching device and method - Google Patents
Energy storage current transformer grid connection and grid disconnection seamless switching device and method Download PDFInfo
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- CN104333042A CN104333042A CN201410654823.6A CN201410654823A CN104333042A CN 104333042 A CN104333042 A CN 104333042A CN 201410654823 A CN201410654823 A CN 201410654823A CN 104333042 A CN104333042 A CN 104333042A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The invention relates to an energy storage current transformer grid connection and grid disconnection seamless switching device and an energy storage current transformer grid connection and grid disconnection seamless switching method. The energy storage current transformer grid connection and disconnection seamless switching device is connected with a power grid monitoring system and a grid connection point switch, and comprises an energy storage current transformer, a controller, a battery management system, a battery pack and a first transformer, wherein the controller is connected with the power grid monitoring system, the energy storage current transformer and the battery management system, the battery pack is connected with the energy storage current transformer and the battery management system, the energy storage current transformer is connected with a first power grid bus through the first transformer, the controller is provided with a first interface connected with a voltage transformer, a second interface connected with the grid connection point switch and a third interface connected with a grid connection point switch position node, and the voltage transformer is arranged above the grid connection point switch. Compared with the prior art, the energy storage current transformer grid connection and grid disconnection seamless switching device and the energy storage current transformer grid connection and grid disconnection seamless switching method have the advantages of being capable of achieving high precision synchronism of grid disconnection to grid connection switching, achieving smooth grid connection to grid disconnection switching, being independent of a communication network and the like.
Description
Technical field
The present invention relates to micro-capacitance sensor control field, especially relate to a kind of energy accumulation current converter and from net seamless switching control device and method.
Background technology
Extensive energy storage technology belongs to Environment Science technology, only have the minority developed countries such as China, European Union, the U.S. to carry out the technology research at present, and achieve certain achievement in research, but multinomial technical bottleneck is not yet broken through.Domestic have Some Universities, Research Center in one's power equipment vendors also start to carry out energy accumulation current converter and from the correlative study of net seamless switching, and technology path is different, and technology is immature in engineer applied fashion, mainly there is following outstanding problem:
1) energy accumulation current converter is grid-connected when leaving network operation, cannot realize load not dead electricity and exist to start from net and there is larger voltage fluctuation instantaneously;
2), when energy accumulation current converter is incorporated into the power networks from net turn (when especially forwarding light current network operation to, as bavin is sent out), impact electrical network cannot be taken over seamlessly and cause weak electric network fault, and instantaneous large-current impact is produced to energy-storage battery that energy accumulation current converter is with;
3) energy accumulation current converter self cannot complete automatic paralleling function, and from net switch heavy dependence configuration and from the inspection control precision same period of net control device;
4) when also site switch is not high speed electronic switch, because switch each operate time is inconsistent and position of the switch node return time is long, therefore cannot Accurate Prediction switch closing time point, and then can cause and when net turns grid-connected, impact electrical network and energy-storage battery that energy accumulation current converter is with produces instantaneous large-current impact;
5) energy accumulation current converter turns heavy dependence communication network transmission in process grid-connected same period and the information such as site grid voltage amplitude phase angle from net.
Current energy accumulation current converter also switches from net also to be needed configuration and realizes from net switching device shifter, existing and mainly there is following shortcoming from net switching device shifter:
1) and poor from the net switching device shifter control precision same period, cause energy accumulation current converter cannot turn grid-connected taking over seamlessly from net and impact an electrical network and cause weak electric network fault, and instantaneous large-current impact is produced to energy-storage battery that energy accumulation current converter is with;
2) and from net switching device shifter deciliter and after the switch of site, judge that position of the switch time delays is longer, also can cause and switch from net and there is impact, and cannot seamless switching be realized;
3) and the site switch motion time and position node return time consistency poor time, also can cause and exist from net handoff procedure and impact, and cannot seamless switching be realized;
4) information such as the grid-connected point voltage amplitude of communication network transmission, frequency of and from net switching device shifter passing through are to energy accumulation current converter, when and cannot ensure due to real-time communication when switching from net, also can cause and there is rush of current from net switching, cannot seamless switching be realized;
5) existing and from net switching be by and coordinated from net switching device shifter with energy accumulation current converter, realtime control is poor, and cost is high.
Summary of the invention
Object of the present invention is exactly provide a kind of can realization to turn grid-connected high accuracy same period, realization the energy accumulation current converter taken over seamlessly from net from net seamless switching control device and method from net to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of energy accumulation current converter from net seamless switching control device, connection grid monitoring system and also site switch respectively, this control device comprises energy accumulation current converter, controller, battery management system, battery pack and the first transformer, described controller connects grid monitoring system respectively, energy accumulation current converter, and battery management system, described battery pack connects energy accumulation current converter and battery management system respectively, described energy accumulation current converter is connected with the first electrical network bus by the first transformer, described controller is provided with the first interface for connecting voltage transformer, for connecting and the second interface of site switch and the 3rd interface for connecting the also position of the switch, site node, described voltage transformer is located at and the upside of site switch.
Described controller is connected with grid monitoring system by local area network (LAN).
Be provided with in described controller and site on the upside of three-phase voltage current sampling circuit, this sampling circuit is connected with voltage transformer.
A kind of energy accumulation current converter from net seamless switching control method, comprises planned and from net switching controls and unplanned property and from net switching controls, wherein,
Described planned and be specially from net switching controls: controller receive that grid monitoring system issues grid-connected leave net instruction after, controller by grid-connected leave net control logic complete to and the sub-switching operation of site switch, and make energy accumulation current converter enter from network operation pattern; After what controller received that grid monitoring system issues turn grid-connected instruction from net, controller completes closing operation to also site switch by turning cutting-in control logic from net, and makes energy accumulation current converter enter the pattern of being incorporated into the power networks;
Described unplanned property is also specially from net switching controls: controller is by being located at and after voltage transformer on the upside of the switch of site detects island protect action, automatically controlling and site switch separating brake, and make energy accumulation current converter enter from network operation pattern; Controller detected by voltage transformer and charged on the upside of the switch of site after, automatically to control and site switch closes a floodgate, and make energy accumulation current converter enter the pattern of being incorporated into the power networks.
Planned and from net switching controls, the described grid-connected net control logic that leaves is specially: controller sends and site switch separating brake instruction, in the switch separating brake 10ms of site, energy accumulation current converter is switched to from network operation pattern at Rapid Detection; Described turn cutting-in control logic from net and be specially: controller sends and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter is switched to the pattern of being incorporated into the power networks at Rapid Detection.
Described unplanned property also from net switching controls, while controller detects island protect action, send and site switch separating brake instruction, and energy accumulation current converter switches to from network operation pattern by time delay 10ms; Controller detect and on the upside of the switch of site charged after, to send and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter switched to the pattern of being incorporated into the power networks at Rapid Detection.
Described Rapid Detection the criterion of site switch separating brake or combined floodgate are for judging and the displacement of the position of the switch, site node or and site three-phase instantaneous power sudden change.
Compared with prior art, the present invention has the following advantages:
1) to arrange in controller and three-phase voltage current sampling circuit site switch divide-shut brake control interface and position of the switch node interface on the upside of the switch of site, simultaneously can detect grid-connected point voltage and electric current, can solve energy accumulation current converter without the need to and can realize turning from net the problem of the grid-connected high accuracy same period from net switching device shifter;
2) integrated in controller and from net seamless switching interface and logic control function, do not rely on and to complete and from net seamless switching from net switching device shifter and communication network;
3) control method does not rely on and site switchtype and operate time, can under grid-connected point selects dissimilar switch conditions, realizes and from the level and smooth seamless switching of net, and then when ensureing at energy accumulation current converter and switch from net, the reliable and stable operation of load;
4) control method and when switching from net, to energy accumulation current converter and electrical network without impact, be therefore also applicable to the little electrical network of capacity of short circuit;
5) control method supports the parallel running of multiple stage energy accumulation current converter, is therefore easy to System Expansion;
6) and from net handoff procedure, controller itself can complete grid-connected synchronization function automatically;
7) well solve energy accumulation current converter in engineer applied and from net seamless switching problem, the development of energy storage key technology be extremely important.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, a kind of energy accumulation current converter from net seamless switching control device, connection grid monitoring system 1 and also site switch 3 respectively, this control device comprises energy accumulation current converter 6, controller 4, battery management system 5, battery pack 7 and the first transformer 9, controller 4 is connected with grid monitoring system 1 by local area network (LAN), and connect energy accumulation current converter 6 and battery management system 5 respectively, battery pack 7 connects energy accumulation current converter 6 and battery management system 5 respectively, and energy accumulation current converter 6 is connected with the first electrical network bus 12 by the first transformer 9.Controller 4 is provided with first interface for connecting voltage transformer 10, for connecting and the second interface of site switch 3 and for connecting and the 3rd interface of the position of the switch, site node 11, voltage transformer 10 is located at and the upside of site switch 3, and site switch 3 is connected with the second electrical network bus 2 by the second transformer 13, be provided with in controller 4 and site on the upside of three-phase voltage current sampling circuit, this sampling circuit is connected with voltage transformer 10, controller 4 can according to the voltage and current signal collected, and obtains and three phase power on the upside of site.And three-phase voltage current sampling circuit leaves net as grid-connected and turn a grid-connected judgement same period from net on the upside of site; Controller is directly controlled and site switch divide-shut brake by Logic judgment, and in real time by detecting and the position of the switch, site with the 3rd interface that also position of the switch, site node 11 is connected.Controller 4 except the control completed energy accumulation current converter 6, also bear receive that grid monitoring system 1 issues and from the transmission of net switching controls instruction, with realize energy accumulation current converter and from net seamless switching.In the present embodiment, the first electrical network bus 12 is 10kV electric pressure electrical network, and the second electrical network bus 2 is 10kV and above electrical network, and the first electrical network bus 12 is connected with important load 8.
Above-mentioned energy accumulation current converter from the control method of net seamless switching control device, comprises planned and from net switching controls and unplanned property and from net switching controls, wherein,
Planned and be specially from net switching controls: controller 4 receive that grid monitoring system 1 issues grid-connected leave net instruction after, controller 4 by grid-connected leave net control logic complete to and the sub-switching operation of site switch 3, and make energy accumulation current converter 6 enter from network operation pattern; After what controller 4 received that grid monitoring system 1 issues turn grid-connected instruction from net, controller 4 completes closing operation to also site switch 3 by turning cutting-in control logic from net, and makes energy accumulation current converter 6 enter the pattern of being incorporated into the power networks;
Unplanned property is also specially from net switching controls: controller 4 is by being located at and after voltage transformer 10 on the upside of site switch 3 detects island protect action, automatically controlling and site switch 3 separating brake, and make energy accumulation current converter 6 enter from network operation pattern; Controller 4 detected by voltage transformer 10 and charged on the upside of site switch 3 after, automatically to control and site switch 3 closes a floodgate, and make energy accumulation current converter 6 enter the pattern of being incorporated into the power networks.
Planned and from net switching controls, the grid-connected net control logic that leaves is specially: controller 4 sends and site switch separating brake instruction, in the switch separating brake 10ms of site, energy accumulation current converter 6 is switched to from network operation pattern at Rapid Detection, Rapid Detection the criterion of site switch separating brake for judge and the displacement of the position of the switch, site node or and the sudden change of site three-phase instantaneous power, namely and the displacement of the position of the switch, site node or and the sudden change of site three-phase instantaneous power time, judge that separating brake is successful; Turn cutting-in control logic from net to be specially: controller 4 sends and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter 6 is switched to the pattern of being incorporated into the power networks at Rapid Detection, the criterion that Rapid Detection site switch close a floodgate for judge and the displacement of the position of the switch, site node or and the sudden change of site three-phase instantaneous power, namely and the displacement of the position of the switch, site node or and the sudden change of site three-phase instantaneous power time, judge to close a floodgate successfully.
Unplanned property also from net switching controls, while controller 4 detects island protect action, send and site switch separating brake instruction, and energy accumulation current converter 6 switches to from network operation pattern by time delay 10ms; Controller 4 detect and site switch 3 on the upside of charged after, send and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter 6 is switched to the pattern of being incorporated into the power networks at Rapid Detection, the criterion that Rapid Detection site switch close a floodgate is for judging and the displacement of the position of the switch, site node or and site three-phase instantaneous power sudden change.
Claims (7)
1. an energy accumulation current converter from net seamless switching control device, connect respectively grid monitoring system (1) and and site switch (3), it is characterized in that, this control device comprises energy accumulation current converter (6), controller (4), battery management system (5), battery pack (7) and the first transformer (9), described controller (4) connects grid monitoring system (1) respectively, energy accumulation current converter (6), with battery management system (5), described battery pack (7) connects energy accumulation current converter (6) and battery management system (5) respectively, described energy accumulation current converter (6) is connected with the first electrical network bus (12) by the first transformer (9), described controller (4) is provided with the first interface for connecting voltage transformer (10), for connecting and the second interface of site switch (3) and the 3rd interface for connecting the also position of the switch, site node (11), described voltage transformer (10) is located at and the upside of site switch (3).
2. a kind of energy accumulation current converter according to claim 1 from net seamless switching control device, it is characterized in that, described controller (4) is connected with grid monitoring system (1) by local area network (LAN).
3. a kind of energy accumulation current converter according to claim 1 from net seamless switching control device, it is characterized in that, be provided with in described controller (4) and site on the upside of three-phase voltage current sampling circuit, this sampling circuit is connected with voltage transformer (10).
4. energy accumulation current converter as claimed in claim 1 from the control method of net seamless switching control device, it is characterized in that, comprises planned and from net switching controls and unplanned property and from net switching controls, wherein,
Described planned and be specially from net switching controls: controller (4) receive that grid monitoring system (1) issues grid-connected leave net instruction after, controller (4) by grid-connected leave net control logic complete to and the sub-switching operation of site switch (3), and make energy accumulation current converter (6) enter from network operation pattern; After what controller (4) received that grid monitoring system (1) issues turn grid-connected instruction from net, controller (4) by turn from net cutting-in control logic complete to and the closing operation of site switch (3), and make energy accumulation current converter (6) enter the pattern of being incorporated into the power networks;
Described unplanned property is also specially from net switching controls: after controller (4) detects island protect action by the voltage transformer (10) being located at also site switch (3) upside, automatic control site switch (3) separating brake, and make energy accumulation current converter (6) enter from network operation pattern; Controller (4) by voltage transformer (10) detect and site switch (3) upside charged after, automatic control site switch (3) close a floodgate, and make energy accumulation current converter (6) enter the pattern of being incorporated into the power networks.
5. energy accumulation current converter according to claim 4 from net seamless switching control method, it is characterized in that, planned and from net switching controls, the described grid-connected net control logic that leaves is specially: controller (4) sends and site switch separating brake instruction, switches to from network operation pattern at Rapid Detection in the switch separating brake 10ms of site by energy accumulation current converter (6); Described turn cutting-in control logic from net and be specially: controller (4) sends and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter (6) is switched to the pattern of being incorporated into the power networks at Rapid Detection.
6. energy accumulation current converter according to claim 4 from net seamless switching control method, it is characterized in that, described unplanned property from net switching controls, while controller (4) detects island protect action, send and site switch separating brake instruction, and energy accumulation current converter (6) switches to from network operation pattern by time delay 10ms; Controller (4) detect and site switch (3) upside charged after, to send and site switch reclosing command, in the switch combined floodgate 10ms of site, energy accumulation current converter (6) switched to the pattern of being incorporated into the power networks at Rapid Detection.
7. the energy accumulation current converter according to claim 5 or 6 from net seamless switching control method, it is characterized in that, described Rapid Detection the criterion of site switch separating brake or combined floodgate are for judging and the displacement of the position of the switch, site node or and site three-phase instantaneous power sudden change.
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Cited By (10)
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| CN104821594A (en) * | 2015-03-27 | 2015-08-05 | 国网上海市电力公司 | Transformation and distribution station connected with energy storage system |
| CN106208367A (en) * | 2015-05-26 | 2016-12-07 | Aes有限公司 | Modularity energy storage method and system |
| CN107612408A (en) * | 2017-09-11 | 2018-01-19 | 广州智光电气股份有限公司 | A kind of energy accumulation current converter and energy-storage system |
| CN108173286A (en) * | 2018-01-22 | 2018-06-15 | 成都鼎智汇科技有限公司 | A kind of intelligent battery energy-storage system |
| CN108847690A (en) * | 2018-08-10 | 2018-11-20 | 国电南京自动化股份有限公司 | A kind of micro-grid operation mode seamless switching control device and method |
| CN109256850A (en) * | 2018-09-14 | 2019-01-22 | 浙江艾罗网络能源技术有限公司 | Energy accumulation current converter and off-network switching device |
| CN109449968A (en) * | 2018-10-19 | 2019-03-08 | 中国科学院电工研究所 | A kind of electric power electric transformer and alternating current-direct current source net lotus multiple-variable flow integration of equipments method |
| CN112821435A (en) * | 2020-12-31 | 2021-05-18 | 珠海格力电器股份有限公司 | Grid-connected and off-grid scheduling method and device and energy storage and power supply system |
| CN115776130A (en) * | 2022-12-29 | 2023-03-10 | 北京索英电气技术股份有限公司 | Grid-connected and off-grid switching method, energy storage converter, energy storage system and power system |
| CN116826795A (en) * | 2023-06-01 | 2023-09-29 | 中能建储能科技(武汉)有限公司 | Energy storage power station non-planned island operation load distribution control equipment and method |
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| CN107612408A (en) * | 2017-09-11 | 2018-01-19 | 广州智光电气股份有限公司 | A kind of energy accumulation current converter and energy-storage system |
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| CN112821435A (en) * | 2020-12-31 | 2021-05-18 | 珠海格力电器股份有限公司 | Grid-connected and off-grid scheduling method and device and energy storage and power supply system |
| CN112821435B (en) * | 2020-12-31 | 2024-03-22 | 珠海格力电器股份有限公司 | Off-grid scheduling method and device and energy storage power supply system |
| CN115776130A (en) * | 2022-12-29 | 2023-03-10 | 北京索英电气技术股份有限公司 | Grid-connected and off-grid switching method, energy storage converter, energy storage system and power system |
| CN115776130B (en) * | 2022-12-29 | 2024-02-02 | 北京索英电气技术股份有限公司 | Off-grid switching method, energy storage converter, energy storage system and power system |
| CN116826795A (en) * | 2023-06-01 | 2023-09-29 | 中能建储能科技(武汉)有限公司 | Energy storage power station non-planned island operation load distribution control equipment and method |
| CN116826795B (en) * | 2023-06-01 | 2024-03-15 | 中能建储能科技(武汉)有限公司 | Energy storage power station non-planned island operation load distribution control equipment and method |
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Application publication date: 20150204 |