CN106961120A - Inverter parallel band carries control method under a kind of island mode - Google Patents
Inverter parallel band carries control method under a kind of island mode Download PDFInfo
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- CN106961120A CN106961120A CN201710242785.7A CN201710242785A CN106961120A CN 106961120 A CN106961120 A CN 106961120A CN 201710242785 A CN201710242785 A CN 201710242785A CN 106961120 A CN106961120 A CN 106961120A
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- inverter
- network
- load switch
- load
- switch
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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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Control method is carried the present invention relates to inverter parallel band under a kind of island mode, is comprised the following steps：1) off-network cell controller judges whether microgrid is in island mode, if so, then carrying out step 2), if it is not, then carrying out step 3)；2) switch k disconnects, and switch k0 closures, off-network inverter work, off-network cell controller controls opening and turning off for load switch k1, k2 and k3 according to bearing power, isolated island microgrid voltage and the feedback of off-network inverter current；3) switch k closures, switch k0 disconnects, and combining inverter normal work, off-network inverter does not work.Compared with prior art, the present invention has the advantages that to consider load classification, improves the service efficiency of new energy power supply, saves cost.
Description
Technical field
The present invention relates to micro-capacitance sensor field, control method is carried more particularly, to inverter parallel band under a kind of island mode.
Background technology
Small-sized microgrid distributed generation system popularization scope is more and more wider now, in the occasions such as factory, community, office building one
As be equipped with many solar energy or wind power grid-connected inverter.When main power network breaks down, traditional way is micro-grid system
Disconnected with the main switch of power network, these combining inverters are stopped, and the other off-network inverters equipped in micro-grid system pass through
The mode of wired and machine or wireless and machine carries out parallel operation and provides electric energy to the important load in micro-grid system jointly.So do
The shortcoming of method is that the green energy resource such as solar energy and wind energy can not be effectively utilized during isolated island occurs, in addition to meeting negative
Many off-network inverters of optional equipment are also needed to the need for load and cause waste in equipment.
The content of the invention
The purpose of the present invention be exactly in order to overcome defect that above-mentioned prior art is present and provide it is a kind of consider load classification,
Improve inverter parallel band under the service efficiency of new energy power supply, cost-effective island mode and carry control method.
The purpose of the present invention can be achieved through the following technical solutions：
Inverter parallel band carries control method under a kind of island mode, comprises the following steps：
1) off-network cell controller judges whether microgrid is in island mode, if so, then carrying out step 2), if it is not, then entering
Row step 3)；
2) switch k disconnects, switch k0 closures, the work of off-network inverter, and off-network cell controller is according to bearing power, isolated island
Microgrid voltage and the feedback of off-network inverter current control opening and turning off for load switch k1, k2 and k3；
3) switch k closures, switch k0 disconnects, and combining inverter normal work, off-network inverter does not work.
Described step 2) in specifically include following steps：
21) off-network cell controller judges whether microgrid voltage isolated island virtual value is less than 230V and whether off-network inverter is full
Reversal of load charges to energy-storage battery, when microgrid voltage isolated island virtual value is more than or equal to 230V and off-network inverter is reverse at full capacity
When being charged to energy-storage battery, step 22 is carried out), otherwise, carry out step 23)；
22) all closure load switch k1, k2 and k3, and it is 2 combining inverters for arriving n that order closes numbering successively,
And return to step 21)；
23) the whole normal works of combining inverter；
24) off-network cell controller judges whether microgrid voltage isolated island virtual value is more than 210V and whether off-network inverter is full
Load is exported, and when microgrid voltage isolated island virtual value is less than or equal to 210V and off-network inverter is exported at full capacity, carries out step
25) step 27, otherwise, is carried out)；
25) judge whether load switch k1, k2 and k3 all close, if so, then closing load switch k1 and k2, disconnect negative
Load switch k3, stops to general load supplying, and return to step 24), if it is not, then carrying out step 26)；
26) when load switch k1 and k2 are closed and load switch k3 disconnects, load switch k1 and disconnecting consumers are closed
Switch k2 and k3, stop to general load and secondary load supplying, and return to step 24), when do not occur load switch k1 and
During the situation that k2 is closed and load switch k3 disconnects, then close all inverters and alarm, return to step 24)；
27) judge whether off-network inverter output power is less than 1-X times of its rated load power, if so, then being walked
It is rapid 28), if it is not, then close all inverters and alarm, return to step 24)；
28) when load switch k1 is closed and load switch k2 disconnects, then close load switch k2 and disconnecting consumers are switched
K3, and return to step 24), when load switch k1 and k2 are closed, then carry out step 29)；
29) judge whether off-network inverter output power is less than 1-X-Y times of its rated power, if so, then closure load
K1, k2 and k3 are switched, to all load supplyings, and return to step 24), if it is not, then closure load switch k1 and k2 and disconnecting negative
Load switch k3, and return to step 24).
Described step 22) in, order is closed the combining inverter that numbering is 2 to n and concretely comprised the following steps successively：
The combining inverter marked as 2 is first closed, off-network cell controller judges that microgrid voltage isolated island virtual value is not less than
Whether the condition of 230V and off-network inverter at full capacity reversely to energy-storage battery charging is set up, if so, then continue to turn off numbering
For 3 combining inverter, stop the shut-off of follow-up combining inverter when condition is invalid.
Described load switch k1, k2 and k3 priority is that k1 is higher than k3 higher than k2.
A kind of control system, the system include off-network cell controller, off-network inverter, energy-storage battery and it is multiple mutually simultaneously
The combining inverter of connection, described energy-storage battery is connected by off-network inverter with the power supply common port of multiple combining inverters,
Load switch k0 is provided between described off-network inverter and power supply common port, provided with load between power supply common port and main power network
K is switched, load switch k1 is provided between power supply common port and important load, provided with load between power supply common port and secondary load
Switch k2, provided with load switch k3 between power supply common port and general load, described off-network cell controller respectively with off-network
Inverter, combining inverter, load switch k0, load switch k, load switch k1, load switch k2 and load switch k3 connections.
Compared with prior art, the present invention has advantages below：
The present invention controls what different stage was loaded by classifying to load by the load switch of three different stages
Use, can be with the off-network inversion of two-way flow by off-network unit intelligent controller one energy of control under piconet island pattern
The parallel operation of device and combining inverter, improves the service efficiency of new energy power supply, saves cost.
Brief description of the drawings
Fig. 1 is off-network inverter parallel system structural representation under island mode of the present invention.
Fig. 2 is control flow block diagram of the invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in figure 1, off-network inverter energy can input termination energy-storage battery with two-way flow, output end passes through switch
K0 accesses micro-grid power source common port；Combining inverter 1, combining inverter 2, ┅, combining inverter n are n platform combining inverters, its
Input is either to connect solar panel or power generation device of giving a dinner for a visitor from afar；Off-network cell controller is microgrid system under island mode
The control unit of system power supply, the combining inverter that the unit is 1 with numbering carries out both-way communication, and reception combining inverter 1 is carried out
Signal and microgrid voltage signal occur for the isolated island that anti-islanding is exported when detecting；Off-network cell controller is 2 grid-connected to n to numbering
Inverter carries out one-way communication, controls them to work or stop；All loads are classified according to it using rank in figure, point
For important load, secondary load and general load, difference connecting valve k1, k2 and k3；All micro-grid power sources and load are by opening
Close k and main power network is attached.
The inventive method impose a condition for：
1st, the power for setting two-way off-network inverter in the present invention is not less than the power sum of important load.
2nd, setting off-network cell controller calculates the X% that secondary load accounts for load gross output in real time, and general load is accounted for
Load the Y% of gross output.
3rd, tri- switches of setting k1, k2, k3, k1's opens highest priority, and secondly, k3 is minimum, it is impossible to k3 occur by k2
Conducting and k1, k2 are not turned on, k1 is situations such as be not turned on for k2 conductings.
It is off-network cell controller collection microgrid voltage effective value, important load total current, secondary load total current, general negative
The total electric current of load and piconet island occur signal etc. and carry out power calculation and logic judgment, are entered according to Fig. 2 control logic flow
Row following operative step：
First, when microgrid is not in island mode, k closures, k0 disconnects, combining inverter normal work, and off-network inversion
Device does not work.
2nd, when microgrid is in island mode, k disconnects, and k0 disconnects, off-network inverter normal work, combining inverter root
Load switch is controlled by off-network cell controller according to bearing power, isolated island microgrid voltage and off-network inverter current feedback situation
K1, k2, k3's opening and turning off.
Specific works situation is subdivided into following eight kinds of situations：
1st, when microgrid voltage isolated island virtual value is not less than 230V and off-network inverter is reverse to energy-storage battery charging at full capacity
When, load switch k1, k2, k3 are all closed, and it is 2 combining inverters for arriving n that numbering is closed successively：First close it is marked as 2 and
Net inverter, off-network cell controller judges above-mentioned microgrid voltage isolated island virtual value not less than 230V and off-network inverter at full capacity
Reversely whether the condition that energy-storage battery charges is set up, if set up, continues to turn off the combining inverter that numbering is 3, Zhi Daoshang
State the invalid shut-off for stopping follow-up combining inverter of condition；
2nd, when piconet island voltage effective value is not more than 210V and off-network inverter is exported at full capacity, combining inverter is complete
Portion's normal work, if present case all closes for load k1, k2, k3, k1, k2 continue to close, and k3 disconnects, and stop to one
As the power supply that loads；
3rd, when piconet island voltage effective value is not more than 210V and off-network inverter is exported at full capacity, if present case
Close, when k3 disconnects, then k1 must be closed, k2, k3 disconnect, stop to secondary load and general load for load switch k1, k2
Power supply.Combining inverter group whole normal work；
4th, when piconet island voltage effective value is not more than 210V and off-network inverter is exported at full capacity, if present case
Closed for load switch k1, when k2, k3 disconnect, the consumption of important load is not less than due to setting the rated power of off-network inverter
The situation, can not possibly occur under normal circumstances in power, turn off all inverters and alarm；
5th, when piconet island voltage effective value is more than 210V and less than 230V, if off-network inverter output power is less than
When (1-X) times of its rated load power, if k1 is closed, when k2 current times disconnect, k2 is set as closure state, k3 must
It must disconnect.Combining inverter group whole normal work；
6th, when piconet island voltage effective value is more than 210V and less than 230V, if off-network inverter output power is less than
Its at full capacity (1-X) times of power when, if k1 and k2 determine whether whether off-network inverter output power small when closing
In (1-X-Y) times of its rated power, if meeting above-mentioned condition, k1, k2, k3 are all closed, to all load supplyings.
Combining inverter group whole normal work；
7th, when piconet island voltage effective value is more than 210V and less than 230V, if off-network inverter output power is less than
Its at full capacity (1-X) times of power when, if k1 and k2 determine whether whether off-network inverter output power small when closing
In (1-X-Y) times of its power at full capacity, if being unsatisfactory for above-mentioned condition, k1, k2 closure, k3 disconnect.Combining inverter group
Whole normal works；
8th, when piconet island voltage effective value, which is less than 210V and off-network inverter, not to be exported at full capacity, due to set from
The rated power of net inverter is not less than the consumption power of important load, can not possibly occur the situation under normal circumstances, turns off institute
There is inverter and alarm.
The present invention, which connects, to be solved under main power network instability condition when main grid collapses, and combining inverter can not be normal
Work, the shortcoming that the green energy resource such as wind energy and solar energy can not be utilized effectively is equipped with an input access in micro-grid system
The energy of energy-storage battery can be with the off-network inverter of two-way flow, the inverter and the connection of other combining inverters, parallel operation
Common powering load.And user load is classified, it is different classes of between load pass through the common connection of same switch
Into microgrid.All combining inverter, off-network inverter and switches are all controlled by off-network cell controller.Due to only
Needing an off-network inverter so to greatly reduce traditional off-network inverter needs to be equipped with the shortcoming of many, makes full use of
The combining inverter being had been provided with power network, improves utilization rate of equipment and installations, saves cost.
Claims (5)
1. inverter parallel band carries control method under a kind of island mode, it is characterised in that comprise the following steps：
1) off-network cell controller judges whether microgrid is in island mode, if so, then carrying out step 2), if it is not, then being walked
It is rapid 3)；
2) switch k disconnects, switch k0 closures, the work of off-network inverter, and off-network cell controller is according to bearing power, isolated island microgrid
Voltage and the feedback of off-network inverter current control opening and turning off for load switch k1, k2 and k3；
3) switch k closures, switch k0 disconnects, and combining inverter normal work, off-network inverter does not work.
2. inverter parallel band carries control method under a kind of island mode according to claim 1, it is characterised in that described
Step 2) in specifically include following steps：
21) off-network cell controller judges whether at full capacity whether microgrid voltage isolated island virtual value be less than 230V and off-network inverter
Reversely energy-storage battery is charged, when microgrid voltage isolated island virtual value is more than or equal to 230V and off-network inverter is reverse to storage at full capacity
During energy battery charging, step 22 is carried out), otherwise, carry out step 23)；
22) whole closure load switch k1, k2 and k3, and closing numbering is 2 to n combining inverter to order successively, and return
Return step 21)；
23) the whole normal works of combining inverter；
24) off-network cell controller judges whether at full capacity whether microgrid voltage isolated island virtual value be more than 210V and off-network inverter
Output, when microgrid voltage isolated island virtual value is less than or equal to 210V and off-network inverter is exported at full capacity, carries out step 25), it is no
Then, step 27 is carried out)；
25) judge whether load switch k1, k2 and k3 all close, if so, then closing load switch k1 and k2, disconnecting consumers are opened
K3 is closed, is stopped to general load supplying, and return to step 24), if it is not, then carrying out step 26)；
26) when load switch k1 and k2 are closed and load switch k3 disconnects, close load switch k1 and disconnecting consumers are switched
K2 and k3, stops to general load and secondary load supplying, and return to step 24), closed when there is not load switch k1 and k2
During the situation that conjunction and load switch k3 disconnect, then close all inverters and alarm, return to step 24)；
27) judge whether off-network inverter output power is less than 1-X times of its rated load power, if so, then carrying out step
28), if it is not, then closing all inverters and alarming, return to step 24)；
28) when load switch k1 is closed and load switch k2 disconnects, then load switch k2 and disconnecting consumers switch k3 are closed, and
Return to step 24), when load switch k1 and k2 are closed, then carry out step 29)；
29) judge whether off-network inverter output power is less than 1-X-Y times of its rated power, if so, then closing load switch
K1, k2 and k3, to all load supplyings, and return to step 24), if it is not, then closure load switch k1 and k2 and disconnecting consumers are opened
Close k3, and return to step 24).
3. inverter parallel band carries control method under a kind of island mode according to claim 2, it is characterised in that described
Step 22) in, order successively close numbering be 2 to n combining inverter concretely comprise the following steps：
The combining inverter marked as 2 is first closed, off-network cell controller judges that microgrid voltage isolated island virtual value is not less than 230V
And whether off-network inverter is reversely set up to the condition that energy-storage battery charges at full capacity, if so, it is 3 then to continue to turn off numbering
Combining inverter, until condition stops the shut-off of follow-up combining inverter when invalid.
4. inverter parallel band carries control method under a kind of island mode according to claim 2, it is characterised in that described
Load switch k1, k2 and k3 priority for k1 higher than k2 be higher than k3.
5. a kind of control system for realizing inverter parallel band load control method under the island mode as described in claim any one of 1-4
System, it is characterised in that the system include off-network cell controller, off-network inverter, energy-storage battery and it is multiple parallel with one another and
Net inverter, described energy-storage battery is connected by off-network inverter with the power supply common port of multiple combining inverters, described
Load switch k0 is provided between off-network inverter and power supply common port, load switch k is provided between power supply common port and main power network,
Load switch k1 is provided between power supply common port and important load, load switch is provided between power supply common port and secondary load
K2, provided with load switch k3 between power supply common port and general load, described off-network cell controller respectively with off-network inversion
Device, combining inverter, load switch k0, load switch k, load switch k1, load switch k2 and load switch k3 connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710242785.7A CN106961120B (en) | 2017-04-14 | 2017-04-14 | Inverter parallel band carries control method under a kind of island mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710242785.7A CN106961120B (en) | 2017-04-14 | 2017-04-14 | Inverter parallel band carries control method under a kind of island mode |
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| CN106961120A true CN106961120A (en) | 2017-07-18 |
| CN106961120B CN106961120B (en) | 2019-11-12 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319815A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Grid connection/disconnection seamless switching method for micro-grid converter |
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2017
- 2017-04-14 CN CN201710242785.7A patent/CN106961120B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319815A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Grid connection/disconnection seamless switching method for micro-grid converter |
Non-Patent Citations (1)
| Title |
|---|
| 陈卫民: "基于微电网运行的光伏逆变电源若干关键技术研究", 《中国博士学位论文全文数据库》 * |
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| CN106961120B (en) | 2019-11-12 |
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