CN104578126A - Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters - Google Patents
Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters Download PDFInfo
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- CN104578126A CN104578126A CN201510051047.5A CN201510051047A CN104578126A CN 104578126 A CN104578126 A CN 104578126A CN 201510051047 A CN201510051047 A CN 201510051047A CN 104578126 A CN104578126 A CN 104578126A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention discloses a micro-grid system and a seamless grid connection/disconnection switching method for energy storage converters. The micro-grid system comprises a plurality of energy storage converters participating in parallel connection networking, a controlled switch for connecting a micro-grid bus with an alternating-current bus, and a host controller in communication connection with the controlled switch and the energy storage converters participating in parallel connection networking. The host controller is used for controlling the energy storage converters participating in parallel connection networking to perform V/F control synchronously and controlling the controlled switch to be disconnected when detecting grid outages or faults, and controlling the energy storage converters participating in parallel connection networking to perform P/Q control synchronously and controlling the controlled switch to be connected when detecting grid power restoration, so that seamless grid connection/disconnection switching of the energy storage converters is achieved on the premise of meeting micro-grid system capacity requirements.
Description
Technical field
The present invention relates to micro-capacitance sensor technical field, more particularly, relate to a kind of micro-grid system and energy accumulation current converter grid-connected/from net seamless handover method.
Background technology
Micro-grid system is that concentrated-distributed generating set, load and EMS etc. are transported to electric system in the small-sized of one.Usually will add energy accumulation current converter in micro-grid system, when grid cut-off or fault, energy accumulation current converter controls (meritorious/Reactive Power Control) by P/Q and transfers V/F control (voltage/frequency control) to, carries out from the independent inverter operation of net; After electrical network incoming call, energy accumulation current converter controls to transfer P/Q to by V/F and controls, and carries out grid-connected discharge and recharge operation.Due to energy accumulation current converter both can be incorporated into the power networks also can from network operation, therefore wish its can grid-connected/between net, carry out seamless switching, also namely energy accumulation current converter carries out quick continuous print conversion between V/F controls and P/Q controls.
Existing energy accumulation current converter is grid-connected/from net seamless switching technique only using separate unit energy accumulation current converter as research object, but constantly expand along with micro-grid system capacity, separate unit energy accumulation current converter can not meet the capacity requirement of micro-grid system.
Summary of the invention
In view of this, the invention provides a kind of micro-grid system and energy accumulation current converter grid-connected/from net seamless handover method, with under the prerequisite meeting micro-grid system capacity requirement, realize energy accumulation current converter grid-connected/from net between seamless switching.
A kind of micro-grid system, comprise the multiple stage energy accumulation current converter participating in networking in parallel, connect the controlled switch of microgrid bus and ac bus, and respectively with the console controller of the multiple stage energy accumulation current converter connecting communication of described controlled switch and described participation networking in parallel, wherein:
Described console controller is used for when grid cut-off or fault being detected, and the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out V/F control, and controls the disconnection of described controlled switch; And after electrical network incoming call being detected, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, and it is closed to control described controlled switch.
Wherein, described console controller is any in the multiple stage energy accumulation current converter of described participation networking in parallel.
Wherein, described console controller is an independent CPU equipment.
Wherein, CAN connecting communication is adopted between the multiple stage energy accumulation current converter of described console controller networking in parallel with described participation.
Wherein, described controlled switch is large capacity quick switch.
Alternatively, described micro-grid system also comprises: and the photovoltaic DC-to-AC converter be connected on described microgrid bus.
Alternatively, described micro-grid system also comprises: and the wind-powered electricity generation inverter be connected on described microgrid bus.
A kind of energy accumulation current converter is grid-connected/from net seamless handover method, comprising:
When console controller detects grid cut-off or fault, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out V/F control, and the controlled switch of control connection microgrid bus and ac bus disconnects;
After described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, and it is closed to control described controlled switch.
Wherein, described console controller can be any one in the multiple stage energy accumulation current converter of described participation networking in parallel, also can be an independent CPU equipment.
Wherein, when described console controller detects grid cut-off or fault, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out V/F control, comprise: when described console controller detects grid cut-off or fault, adopt the multiple stage energy accumulation current converter of CAN communication mode control and participate in networking in parallel synchronously to carry out V/F control;
After described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, comprise: after described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter adopting CAN communication mode to control described participation networking in parallel synchronously carries out P/Q control.
As can be seen from above-mentioned technical scheme, the present invention carries out by introducing multiple stage energy accumulation current converter in micro-grid system the capacity requirement that networking in parallel meets system; Console controller in system is when grid cut-off or fault being detected, and the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out from the independent inverter operation of net; When detecting that electrical network is normal, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out grid-connected discharge and recharge operation; Because console controller can carry out unified coordination and administration to the operating state of these energy accumulation current converters, its operating state is made to remain synchronous, therefore no matter be leave net grid-connected or turn in grid-connected process from net, all can under the prerequisite meeting micro-grid system capacity requirement, realize this entirety of being made up of the energy accumulation current converter be in parallel grid-connected/from the seamless switching between net.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of micro-grid system structural representation disclosed in the embodiment of the present invention;
Fig. 2 a kind of energy accumulation current converter disclosed in the embodiment of the present invention is grid-connected/from net seamless handover method flow chart.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the invention discloses a kind of micro-grid system, with under the prerequisite meeting micro-grid system capacity requirement, realize energy accumulation current converter grid-connected/from net between seamless switching, comprise: the multiple stage energy accumulation current converter 10 participating in networking in parallel, connect the controlled switch 20 of microgrid bus and ac bus, and respectively with controlled switch 20 and the console controller 30 of multiple stage energy accumulation current converter 10 connecting communication participating in networking in parallel, wherein:
Console controller 30 is for when grid cut-off or fault being detected, and the multiple stage energy accumulation current converter 10 of control and participate in networking in parallel synchronously carries out V/F control (voltage/frequency control), and controls controlled switch 20 and disconnect; And after electrical network incoming call being detected, the multiple stage energy accumulation current converter 10 of control and participate in networking in parallel synchronously carries out P/Q control (meritorious/Reactive Power Control), and it is closed to control controlled switch 20.
The direct current side joint storage battery of energy accumulation current converter 10, exchanges side joint microgrid bus and load, both can be incorporated into the power networks with electrical network under P/Q controls, and can depart from electrical network isolated operation again under V/F controls.Above-mentioned ac bus is electrical network bus.
For meeting the capacity requirement of micro-grid system, the present embodiment introduces multiple stage energy accumulation current converter to carry out networking in parallel in micro-grid system, and compared to the micro-grid system only with 1 energy accumulation current converter, power system capacity promotes greatly;
When electrical network is normal, micro-grid system requires that each energy accumulation current converter 10 in parallel synchronously carries out P/Q control, to regulate the power output on ac bus.Now controlled switch 20 need be in closure state, the idiographic flow that this P/Q controls is: the given value of current instruction that console controller 30 sends according to backstage, corresponding angle, active current and referenced reactive current of grid-connected moment is exported to each energy accumulation current converter 10, each energy accumulation current converter 10 carries out current inner loop according to the command synchronization received and controls and PWM generation, realizes grid-connected discharge and recharge and runs.
When grid cut-off or fault, micro-grid system requires that the energy accumulation current converter 10 of multiple stage parallel connection synchronously carries out V/F control, to set up microgrid voltage and frequency (i.e. " networking in parallel ").Now controlled switch 20 need be in off-state, the idiographic flow that this V/F controls is: outer voltage control is carried out in the voltage given instruction that console controller 30 sends according to backstage, calculate angle, active current and referenced reactive current and export to each energy accumulation current converter 10, each energy accumulation current converter 10 carries out current inner loop according to the command synchronization received and to control and PWM occurs, and transfers to carry out independent inverter operation from net state from also net state.
The present embodiment adopts the mode of multiple stage energy accumulation current converter 10 networking in parallel to improve micro-grid system capacity, console controller 30 is when grid cut-off or fault being detected, the multiple stage energy accumulation current converter 10 of control and participate in networking in parallel synchronously carries out from the independent inverter operation of net, when detecting that electrical network is normal, the multiple stage energy accumulation current converter 10 of the grid-connected networking of control and participate in synchronously carries out grid-connected discharge and recharge operation; Because console controller 30 can carry out unified coordination and administration to the operating state of these energy accumulation current converters, its operating state is made to remain synchronous, therefore no matter be leave net grid-connected, or turn in grid-connected process from net, all can under the prerequisite meeting micro-grid system capacity requirement, realize this entirety that the energy accumulation current converter after parallel connection 10 forms grid-connected/from the seamless switching between net.So-called seamless switching, refers to that the entirety that is made up of the energy accumulation current converter 10 be in parallel is grid-connected and very short from the time switched between netting, and is less than 10 milliseconds usually.
Wherein, console controller 30 can be an independent CPU equipment, also can be any of participating in the multiple stage energy accumulation current converter 10 of networking in parallel.The present embodiment adopts the latter preferably, the multiple stage energy accumulation current converter 10 participating in networking in parallel forms the control model of " one master and multiple slaves ", and when main frame breaks down or be abnormal, other can compete the main frame made new advances from machine, maintain micro-grid system to continue to run, reliability is higher.
Preferably, console controller 30 with adopt CAN connecting communication between the multiple stage energy accumulation current converter 10 participating in networking in parallel, to realize the quick transmission of angle, active current and referenced reactive current.Certainly, also can adopt other rapid communication schemes except CAN communication, not limit to.
Wherein, controlled switch 20 preferably large capacity quick switch is higher with the use of, reliability, fail safe with Large Copacity micro-grid system.
In addition, still see Fig. 1, in the micro-grid system disclosed in the present embodiment, microgrid bus also in parallelly can access photovoltaic DC-to-AC converter 40 and/or wind-powered electricity generation inverter 50, then or other customer charges.Energy accumulation current converter 10 is using storage battery as input source, photovoltaic DC-to-AC converter 40 is using photovoltaic battery panel as input source, wind-powered electricity generation inverter 50, using wind power plant as input source, adding of photovoltaic DC-to-AC converter 40 and wind-powered electricity generation inverter 50, makes micro-grid system energy-saving and environment friendly more.
See Fig. 2, the embodiment of the invention discloses a kind of energy accumulation current converter grid-connected/from net seamless handover method, with under the prerequisite meeting micro-grid system capacity requirement, realize energy accumulation current converter grid-connected/from net between seamless switching, comprising:
Step 201: whether console controller detection of grid power-off or failure condition occur, if grid experiences power loss or fault, enters step 202; Otherwise, enter step 203;
Step 202: the multiple stage energy accumulation current converter of console controller control and participate in networking in parallel synchronously carries out V/F control, and the controlled switch of control connection microgrid bus and ac bus disconnects;
Step 203: the multiple stage energy accumulation current converter that console controller controls described participation networking in parallel synchronously carries out P/Q control, and it is closed to control described controlled switch.
After system starts, step 201 ~ step 203 circulates and performs, thus under the prerequisite meeting micro-grid system capacity requirement, achieve energy accumulation current converter grid-connected/from the seamless switching between net.
Wherein, described console controller can be any one in the multiple stage energy accumulation current converter of described participation networking in parallel, also can be an independent CPU equipment.
Wherein, the multiple stage energy accumulation current converter of described console controller control and participate in networking in parallel synchronously carries out V/F control, comprising: console controller adopts the multiple stage energy accumulation current converter of CAN communication mode control and participate in networking in parallel synchronously to carry out V/F control;
The multiple stage energy accumulation current converter that described console controller controls described participation networking in parallel synchronously carries out P/Q control, comprising: the multiple stage energy accumulation current converter that console controller adopts CAN communication mode to control described participation networking in parallel synchronously carries out P/Q control.
In sum, the present invention carries out by introducing multiple stage energy accumulation current converter in micro-grid system the capacity requirement that networking in parallel meets system; Console controller in system is when grid cut-off or fault being detected, and the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out from the independent inverter operation of net; When detecting that electrical network is normal, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out grid-connected discharge and recharge operation; Because console controller can carry out unified coordination and administration to the operating state of these energy accumulation current converters, its operating state is made to remain synchronous, therefore no matter be leave net grid-connected or turn in grid-connected process from net, all can under the prerequisite meeting micro-grid system capacity requirement, realize this entirety of being made up of the energy accumulation current converter be in parallel grid-connected/from the seamless switching between net.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For method disclosed in embodiment, because it is corresponding with micro-grid system disclosed in embodiment, so description is fairly simple, relevant part illustrates see micro-grid system part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a micro-grid system, it is characterized in that, comprise the multiple stage energy accumulation current converter participating in networking in parallel, connect the controlled switch of microgrid bus and ac bus, and respectively with the console controller of the multiple stage energy accumulation current converter connecting communication of described controlled switch and described participation networking in parallel, wherein:
Described console controller is used for when grid cut-off or fault being detected, and the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out V/F control, and controls the disconnection of described controlled switch; And after electrical network incoming call being detected, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, and it is closed to control described controlled switch.
2. micro-grid system according to claim 1, is characterized in that, described console controller is any one in the multiple stage energy accumulation current converter of described participation networking in parallel.
3. micro-grid system according to claim 1, is characterized in that, described console controller is an independent CPU equipment.
4. the micro-grid system according to claim 1,2 or 3, is characterized in that, adopts CAN connecting communication between the multiple stage energy accumulation current converter of described console controller networking in parallel with described participation.
5. the micro-grid system according to claim 1,2 or 3, is characterized in that, described controlled switch is large capacity quick switch.
6. micro-grid system according to claim 1, is characterized in that, described micro-grid system also comprises: and the photovoltaic DC-to-AC converter be connected on described microgrid bus.
7. micro-grid system according to claim 1, is characterized in that, described micro-grid system also comprises: and the wind-powered electricity generation inverter be connected on described microgrid bus.
8. energy accumulation current converter grid-connected/from a net seamless handover method, it is characterized in that, comprising:
When console controller detects grid cut-off or fault, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out V/F control, and the controlled switch of control connection microgrid bus and ac bus disconnects;
After described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, and it is closed to control described controlled switch.
9. energy accumulation current converter according to claim 8 grid-connected/from net seamless handover method, it is characterized in that, described console controller can be any one in the multiple stage energy accumulation current converter of described participation networking in parallel, also can be an independent CPU equipment.
10. energy accumulation current converter according to claim 8 or claim 9 grid-connected/from net seamless handover method, it is characterized in that, when described console controller detects grid cut-off or fault, the multiple stage energy accumulation current converter of control and participate in networking in parallel synchronously carries out V/F control, comprise: when described console controller detects grid cut-off or fault, adopt the multiple stage energy accumulation current converter of CAN communication mode control and participate in networking in parallel synchronously to carry out V/F control;
After described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter controlling described participation networking in parallel synchronously carries out P/Q control, comprise: after described console controller detects electrical network incoming call, the multiple stage energy accumulation current converter adopting CAN communication mode to control described participation networking in parallel synchronously carries out P/Q control.
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| CN104953619A (en) * | 2015-06-30 | 2015-09-30 | 阳光电源股份有限公司 | Grid-connected and off-grid conversion method for current converters and power generation system |
| CN104980091A (en) * | 2015-06-23 | 2015-10-14 | 四川蜀旺科技有限公司 | Luminous energy storage inversion system |
| CN111200292A (en) * | 2019-12-18 | 2020-05-26 | 国网智能科技股份有限公司 | Energy storage converter parallel control method and system |
| CN111342487A (en) * | 2020-02-28 | 2020-06-26 | 国充充电科技江苏股份有限公司 | Parallel control method and system of energy storage converter and electronic equipment |
| CN111509845A (en) * | 2020-04-16 | 2020-08-07 | 南京南瑞继保电气有限公司 | Intelligent mobile micro-grid control system and method |
| CN112787343A (en) * | 2021-01-27 | 2021-05-11 | 广州智光电气技术有限公司 | Control method and device for converting parallel energy storage converters from grid connection to off-grid connection |
| CN112803458A (en) * | 2021-01-12 | 2021-05-14 | 南京信息工程大学 | Current sharing control method for solar station and parallel inverter power supply |
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Application publication date: 20150429 |
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