CN102403730A - Uninterrupted power supply type control method for distribution grid-combined generating system - Google Patents
Uninterrupted power supply type control method for distribution grid-combined generating system Download PDFInfo
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- CN102403730A CN102403730A CN2011103328156A CN201110332815A CN102403730A CN 102403730 A CN102403730 A CN 102403730A CN 2011103328156 A CN2011103328156 A CN 2011103328156A CN 201110332815 A CN201110332815 A CN 201110332815A CN 102403730 A CN102403730 A CN 102403730A
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Abstract
The invention relates to an uninterrupted power supply type control method for a distribution grid-combined generating system. In the system, load is is separated as important load and regular load, and a switch which can be controlled by a controller is added before the load; once the controller detects an islanding effect, the controller can be automatically switched to an independent operating mode without stopping and manually controlling while switching off a grid-combined switch and splitting a power grid, so that the power is ensured to be continuously supplied to the important load; the integral performance of the distribution grid-combined generating system is improved, and the advantages of the distribution generating system are put into effect sufficiently to complement with the advantages of the power grid; a hardware design is simplified and the cost is reduced without arranging an external hand-operated switch and a double-loop output interface; a series-connected topological structure of a switch for a grid-combined mode operation and a switch for an independent mode operation improves the stability and the safety of the whole system when the switch has a fault; when any one of the power grid or an inverter has a fault and then is stopped, the other one can provide the electric power continuously.
Description
Technical field
The present invention relates to a kind of intelligent grid, the distributed grid-connected system control method of particularly a kind of uninterrupted power supply type.
Background technology
When distributed generation system and electrical network were incorporated into the power networks, if grid side has an accident or has a power failure when keeping in repair, the distributed generation system of user side must break away from power utilization network, carries out the grid side troubleshooting.For distributed generation system, at this moment become the islet operation pattern to form island effect from the mode switch that is incorporated into the power networks.If island effect continues, very easily grid equipment is caused damage, the maintenance personal is brought harm.For fear of the generation of island effect, distributed generation system must possess the island detection function, when island effect takes place, breaks off the switch that is incorporated into the power networks, with grid disconnection in, stop the operation of distributed generation system.Produced following problem like this:
1, can not supply power to important load continuously.If sudden power causes danger and damage very easily for the equipment and the personnel of user side;
2, before the electrical network reparation, the distributed generation system operation is in halted state;
3, sunlight, fuel cell, wind-force can not continue to use, and cause renewable energy utilization efficient to reduce;
When 4, disaster took place, distributed generation system can't effectively be brought into play himself independent generating characteristic, electric power was provided for nearly user side;
5, as implementing the switching of the pattern of being incorporated into the power networks, can only could realize through outside hand control switch and double loop output to independent operation mode;
6, satisfy following two conditions, just can restart, realize the conversion of operational mode;
After distributed generation system must stop the long period, ability manual switchover external switch;
Output must change to independent output interface terminal from the output interface terminal that is incorporated into the power networks.
Summary of the invention
The present invention be directed to is incorporated into the power networks forms the problem of the infringement that island effect brings, and has proposed the distributed grid-connected system control method of a kind of uninterrupted power supply type, in this system; In case detect island effect; When switch and grid disconnection are incorporated into the power networks in disconnection, need not stop just can automatically switching to independent operation mode with manually controlling, if; The power output of distributed generation system is greater than or equal to the rated power of important load, can supply power to important load continuously.Important load does not only need to have a power failure like this, and distributed generation system need not stop yet.Except above function, also can implement island effect detection and protection simply through the compatible current requirements of software set.
Technical scheme of the present invention is: the distributed grid-connected system control method of a kind of uninterrupted power supply type comprises following concrete steps:
1), set up the distributed grid-connected system of uninterrupted power supply type: distributed generation system comprise DC power supply,, voltage boosting dc transducer, combining inverter and the switch that is incorporated into the power networks; After DC power supply carries out the orthogonal conversion through combining inverter; Through switch and to the electrical network powering load, load is divided into important load and conventional load
o, being provided with the stand-alone mode run switch at the important load front end, important load rear end and conventional load front end are provided with the mode operation switch that is incorporated into the power networks, and important load connects the distributed generation system rear end, the open and close that are controlled by the controller of the conventional load front end that gets access to grid, switch;
When 2), being incorporated into the power networks: at first detect the points of common connection mains voltage signal; Begin to be incorporated into the power networks synchronously automatically action; After satisfying the condition that is incorporated into the power networks, the controller control command mode operation switch that is incorporated into the power networks is closed with the stand-alone mode run switch, and distributed generation system and electrical network realization are incorporated into the power networks;
3), the back of being incorporated into the power networks: isolated island protection action beginning is effective, and electrical network and distributed generation system are given the power supply of common load and important load simultaneously;
4), during electric network fault: when electrical network breaks down; The distributed generation system of motion detects island effect through opening the isolated island protection, and detected isolated island signal send controller; Controller is controlled the mode operation that is incorporated into the power networks and is broken off with switch, and electrical network breaks away from from distributed grid-connected system; Distributed generation system continues to the important load power supply, and combining inverter changes control mode according to controlling object:
A) when being incorporated into the power networks, need convert voltage control into to Current Control;
B) when being voltage control, remain unchanged;
At this moment, distributed generation system continues to supply power to important load as alternating-current voltage source just as electrical network;
5), during the combining inverter fault: when combining inverter broke down, controller control independent operation mode broke off with switch, and at this moment distributed generation system breaks away from from distributed grid-connected system;
If during the electrical network normal condition, common load and important load continue by mains supply;
If during grid failure state, the controller control pattern that is incorporated into the power networks is broken off with switch;
When 6), being incorporated into the power networks again: repeating step 2)～5).
Said stand-alone mode run switch be incorporated into the power networks the mode operation switch can be the hilted broadsword formula also can be the double-pole formula.
Said important load and stand-alone mode run switch are connected in series, and connect the distributed generation system rear end after the series connection and are incorporated into the power networks mode operation switch front end.
Beneficial effect of the present invention is: the distributed grid-connected system control method of uninterrupted power supply type of the present invention, important load has been implemented uninterrupted power supply, and the supply power mode of duplicate supply has improved the overall performance of distributed generation system; Distributed power source has been implemented continuous operation; Sunlight, fuel cell, renewable resource sustainable uses such as wind-force have improved the utilization ratio of renewable resource; The advantage of distributed power source is given full play to, and has complementary advantages between electrical network; Need not to be provided with outside hand switch and double loop output interface, simplified hardware designs and reduced cost; The mode operation that is incorporated into the power networks has improved the stable and fail safe of whole system when switch breaks down with the series connection topological structure of switch with switch and stand-alone mode operation; Either party breaks down electrical network or inverter when stopping, and remaining one can be to continue to provide electric power.
Description of drawings
Fig. 1 is the distributed grid-connected system structure chart of current version;
Fig. 2 is distributed grid-connected system instance 1 structure chart of uninterrupted power supply type of the present invention;
Fig. 3 is distributed grid-connected system instance 2 structure charts of uninterrupted power supply type of the present invention;
Fig. 4 is distributed grid-connected system instance 3 structure charts of uninterrupted power supply type of the present invention.
Embodiment
The distributed grid-connected system structure chart of current version as shown in Figure 1; Distributed generation system comprises DC power supply (can be solar cell, wind-driven generator and fuel cell), voltage boosting dc transducer, combining inverter and the switch that is incorporated into the power networks; DC power supply is through after combining inverter carries out the orthogonal conversion, through switch and to the electrical network powering load.
Distributed grid-connected system instance 1 structure chart of uninterrupted power supply type as shown in Figure 2 is divided into important load Rs and conventional load R with load
o, at important load Rs and conventional load R
oFront end is respectively equipped with double-pole formula stand-alone mode run switch S
a-S
bUse switch S with the pattern of being incorporated into the power networks
1-S
2,, important load Rs connects the distributed power source rear end, conventional load R
oThe open and close that are controlled by the controller of the front end that gets access to grid, the switch that is incorporated into the power networks.Working method is following:
When 1) being incorporated into the power networks:
At first detect the points of common connection power network signal, begin to be incorporated into the power networks synchronously automatically action.After satisfying the condition that is incorporated into the power networks, through control command relay_1 and relay_2, closure be incorporated into the power networks mode operation switch and stand-alone mode run switch, the initial condition of switch all is set at the state of disconnection, and here, relay_1 is S
1-S
2Control command, relay_2 is S
a-S
bControl command, in relay_1=1, relay_2=1, distributed generation system and electrical network are realized being incorporated into the power networks.
2) be incorporated into the power networks afterwards:
Isolated island protection action beginning effectively.At this moment, electrical network and distributed generation system are given the power supply of common load and important load simultaneously.
3) during electric network fault:
When electrical network broke down, the distributed generation system of motion detected island effect through opening the isolated island protection.Utilize detected isolated island signal as control command, break off the mode operation that is incorporated into the power networks and use switch S
1-S
2
Controller sends the instruction of relay_1=0, breaks off the pattern of being incorporated into the power networks and uses switch S
1-S
2At this moment, electrical network breaks away from from distributed grid-connected system.
When electrical network broke away from from distributed grid-connected system, distributed generation system need not stop still to move.But the inverter control mode possibly need to change.Can be divided into following two kinds of situation according to controlling object:
1, when being incorporated into the power networks, need convert voltage control into to Current Control;
2, when being voltage control, remain unchanged;
At this moment, distributed generation system continues to supply power to important load as alternating-current voltage source just as electrical network.
If want to let distributed generation system also stop, only needing simply to instruct through sending relay_1 and relay_2 in the controller, let relay_1=0 and relay_2=0.
4) during the combining inverter fault:
When combining inverter broke down, controller sent the instruction of relay_2=0, broke off independent operation mode and used switch S
a-S
b, at this moment distributed generation system breaks away from from distributed grid-connected system.
If during the electrical network normal condition, common load and important load continue by mains supply.
If during grid failure state, controller sends the instruction of relay_1=0, breaks off the pattern of being incorporated into the power networks and uses switch S
1-S
2
When 5) being incorporated into the power networks again: the step that repeats the front.
Like Fig. 3, distributed grid-connected system instance 2,3 structure charts of the type of uninterrupted power supply shown in 4, load is divided into important load Rs and conventional load R
o, at important load Rs and conventional load R
oFront end is respectively equipped with hilted broadsword formula stand-alone mode run switch S
aUse switch S with the pattern of being incorporated into the power networks
1, important load Rs connects the distributed generation system rear end, conventional load R
oThe front end end that gets access to grid, the switch that is incorporated into the power networks be controlled by the controller open and close, wherein conventional load R
oThe pattern of being incorporated into the power networks use switch S
1Be connected in the major loop, like Fig. 3 and 4, the stand-alone mode run switch S of important load Rs
aCan be connected on the major loop, also can be parallel to the distributed generation system two ends after important load Rs connects.
When 1) being incorporated into the power networks:
At first detect the points of common connection power network signal, begin to be incorporated into the power networks synchronously automatically action.After satisfying the condition that is incorporated into the power networks, through control command relay_1 and relay_2, closure be incorporated into the power networks mode operation switch and stand-alone mode run switch, the initial condition of switch all is set at the state of disconnection.Here, relay_1 is S
1Control signal, relay_2 is S
aControl signal.In relay_1=1, relay_2=1, distributed generation system and electrical network are realized being incorporated into the power networks.
2) be incorporated into the power networks afterwards:
Isolated island protection action beginning effectively.At this moment, electrical network and distributed generation system are given the power supply of common load and important load simultaneously.
3) during electric network fault:
When electrical network broke down, the distributed generation system of motion detected island effect through opening the isolated island protection.Utilize detected isolated island signal as control command, break off the mode operation that is incorporated into the power networks and use switch S
1
Controller sends the instruction of relay_1=0, breaks off the pattern of being incorporated into the power networks and uses switch S
1At this moment, electrical network breaks away from from distributed grid-connected system.
When electrical network broke away from from distributed grid-connected system, distributed generation system need not stop still to move.But the inverter control mode possibly need to change.Can be divided into following two kinds of situation according to controlling object:
As when being incorporated into the power networks, need convert voltage control into to Current Control;
As when being voltage control, remain unchanged;
At this moment, distributed generation system continues to supply power to important load as alternating-current voltage source as electrical network.
If want to let distributed generation system also stop, only needing simply to instruct through sending relay_1 and relay_2 in the controller, let relay_1=0 and relay_2=0.
4) during the combining inverter fault:
When combining inverter broke down, controller sent the instruction of relay_1=0 and relay_2=0, broke off the mode operation that is incorporated into the power networks and used switch S
1Use switch S with independent operation mode
a, at this moment distributed generation system breaks away from from distributed grid-connected system and cuts off important load.
When 5) being incorporated into the power networks again: the step that repeats the front.
Claims (3)
1. the distributed grid-connected system control method of uninterrupted power supply type is characterized in that, comprises following concrete steps:
1), set up the distributed grid-connected system of uninterrupted power supply type: distributed generation system comprise DC power supply,, voltage boosting dc transducer, combining inverter and the switch that is incorporated into the power networks; After DC power supply carries out the orthogonal conversion through combining inverter; Through switch and to the electrical network powering load, load is divided into important load and conventional load
o, being provided with the stand-alone mode run switch at the important load front end, important load rear end and conventional load front end are provided with the mode operation switch that is incorporated into the power networks, and important load connects the distributed generation system rear end, the open and close that are controlled by the controller of the conventional load front end that gets access to grid, switch;
When 2), being incorporated into the power networks: at first detect the points of common connection mains voltage signal; Begin to be incorporated into the power networks synchronously automatically action; After satisfying the condition that is incorporated into the power networks, the controller control command mode operation switch that is incorporated into the power networks is closed with the stand-alone mode run switch, and distributed generation system and electrical network realization are incorporated into the power networks;
3), the back of being incorporated into the power networks: isolated island protection action beginning is effective, and electrical network and distributed generation system are given the power supply of common load and important load simultaneously;
4), during electric network fault: when electrical network breaks down; The distributed generation system of motion detects island effect through opening the isolated island protection, and detected isolated island signal send controller; Controller is controlled the mode operation that is incorporated into the power networks and is broken off with switch, and electrical network breaks away from from distributed grid-connected system; Distributed generation system continues to the important load power supply, and combining inverter changes control mode according to controlling object:
A) when being incorporated into the power networks, need convert voltage control into to Current Control;
B) when being voltage control, remain unchanged;
At this moment, distributed generation system continues to supply power to important load as alternating-current voltage source just as electrical network;
5), during the combining inverter fault: when combining inverter broke down, controller control independent operation mode broke off with switch, and at this moment distributed generation system breaks away from from distributed grid-connected system;
If during the electrical network normal condition, common load and important load continue by mains supply;
If during grid failure state, the controller control pattern that is incorporated into the power networks is broken off with switch;
When 6), being incorporated into the power networks again: repeating step 2)～5).
2. according to the distributed grid-connected system control method of the said uninterrupted power supply type of claim 1, it is characterized in that, said stand-alone mode run switch be incorporated into the power networks the mode operation switch can be the hilted broadsword formula also can be the double-pole formula.
3. according to the distributed grid-connected system control method of the said uninterrupted power supply type of claim 1, it is characterized in that said important load and stand-alone mode run switch are connected in series, connect the distributed generation system rear end after the series connection and be incorporated into the power networks mode operation switch front end.
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| CN2011103328156A CN102403730A (en) | 2011-10-28 | 2011-10-28 | Uninterrupted power supply type control method for distribution grid-combined generating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102751739A (en) * | 2012-07-02 | 2012-10-24 | 上海电力学院 | Anti-disaster photovoltaic power generation system |
| CN103269089A (en) * | 2013-06-03 | 2013-08-28 | 河海大学常州校区 | Multi-energy complementary micro-grid online type supporting inverter |
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| CN201467023U (en) * | 2009-04-15 | 2010-05-12 | 北京能高自动化技术有限公司 | Solar photovoltaic micro-grid power generation system |
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| CN102169342A (en) * | 2011-05-13 | 2011-08-31 | 吉林省电力有限公司电力科学研究院 | Distribution network coordination control system and control method taking account of distributed power |
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2011
- 2011-10-28 CN CN2011103328156A patent/CN102403730A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201467023U (en) * | 2009-04-15 | 2010-05-12 | 北京能高自动化技术有限公司 | Solar photovoltaic micro-grid power generation system |
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| CN102169342A (en) * | 2011-05-13 | 2011-08-31 | 吉林省电力有限公司电力科学研究院 | Distribution network coordination control system and control method taking account of distributed power |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751739A (en) * | 2012-07-02 | 2012-10-24 | 上海电力学院 | Anti-disaster photovoltaic power generation system |
| CN103269089A (en) * | 2013-06-03 | 2013-08-28 | 河海大学常州校区 | Multi-energy complementary micro-grid online type supporting inverter |
| CN103269089B (en) * | 2013-06-03 | 2014-12-03 | 河海大学常州校区 | Multi-energy complementary micro-grid online type supporting inverter |
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Application publication date: 20120404 |