CN104410165B - A kind of method and system of micro-internetworking - Google Patents
A kind of method and system of micro-internetworking Download PDFInfo
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- CN104410165B CN104410165B CN201410764868.9A CN201410764868A CN104410165B CN 104410165 B CN104410165 B CN 104410165B CN 201410764868 A CN201410764868 A CN 201410764868A CN 104410165 B CN104410165 B CN 104410165B
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Abstract
The invention discloses the method and system of a kind of micro-internetworking, relate to distributed energy technical field, for effectively overcoming rush of current is big when micro-internetworking problem to invent.Including: when determining that two microgrids meet interconnection condition, network scheduling system sends the order of closing operation to party in request's microgrid；After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；Then, network scheduling system receives the successful information of connection of described supplier's microgrid feedback.The present invention is suitable in distributed energy technology.
Description
Technical field
The present invention relates to distributed energy technical field, particularly relate to the method and system of a kind of micro-internetworking.
Background technology
Distributed energy technology refers to and with small-scale, low capacity, modularity, distributed mode, cold heat electricity system is directly installed on user side, can export hot and cold, electric energy etc. independently.Microgrid (is also referred to as distributed energy islanded system) as the important Land use systems of distributed energy technology, refer to and multiple loads and multiple distributed power source are formed micronet according to certain topological structure, and be coupled to normal grid by static switch pass.
In prior art, microgrid has certain space independence, it is possible to provide schedulable load for local power system, it is possible to respond to meet system needs within the several seconds, provide strong support to bulk power grid in good time；And can not affect the load of client at maintenance system simultaneously.And for user, microgrid also can as a customizable power supply, it is possible to meet the diversified demand of user.
But, at least there are the following problems to inventor have found that prior art: state in design in each microgrid at the beginning of distributed energy resource system with can scale and can substantially match that by energy rule, but elapsing over time, its supply and demand by energy scale with by energy rule is likely to no longer mate.Thus possible a kind of mode is, is undertaken interconnecting to redistribute the energy by microgrid.But actually microgrid needs when interconnecting to overcome various obstacle, for instance, carry out interconnecting or disconnecting rush of current during interconnection big.Therefore, how to overcome rush of current to become greatly the problem being currently needed for solving when carrying out interconnecting or disconnecting interconnection.
Summary of the invention
The embodiment of the present invention provides the method and system of a kind of micro-internetworking, it is possible to overcome the problem that rush of current is big when micro-internetworking.
The embodiment of the present invention adopts the following technical scheme that
A kind of method of micro-internetworking, is applied to network scheduling system, including:
When determining that two microgrids meet interconnection condition, send the order of closing operation to party in request's microgrid；
After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；
Receive the successful information of connection of described supplier's microgrid feedback.
A kind of method of micro-internetworking, it is applied to party in request's microgrid, it is provided with interconnection between described party in request microgrid and supplier's microgrid, described interconnection is provided with the first switch disconnector on the position of described party in request's microgrid side, wherein, described party in request microgrid and described supplier's microgrid are defined as there is supply and demand complementation within following a period of time by network scheduling system, and described method includes:
Receive the order connecting described interconnection that network scheduling system sends；
Detect on described interconnection near the circuit of described party in request's microgrid side whether without pressing；
If detecting, described circuit is without pressure, connects described first switch disconnector, and sends the information without pressing lock to described network scheduling system.
A kind of method of micro-internetworking, it is applied to supplier's microgrid, it is provided with interconnection between described supplier's microgrid and party in request's microgrid, described interconnection is provided with second switch chopper on the position of described supplier's microgrid, wherein, described party in request microgrid and described supplier's microgrid are defined as there is supply and demand complementation within following a period of time by network scheduling system, and described method includes:
Receive the order connecting described interconnection that network scheduling system sends；
The instruction increasing generated output is issued so that total load reaches the second predetermined power threshold value with total power difference generated electricity to distributed energy equipment；
If total load reaches the second predetermined power threshold value with total power difference generated electricity, detect whether meet syn-collisional granite condition between described supplier's microgrid and described party in request microgrid；
If meeting syn-collisional granite condition between described supplier's microgrid and described party in request microgrid, connecting described second switch chopper, and sending the information having pressing lock to described network scheduling system.
A kind of microgrid interacted system, described system includes at least two microgrid, network scheduling system and interconnection, described interconnection is used for connection requirement side's microgrid and supplier's microgrid, described interconnection is provided with the first switch disconnector on the position of described party in request's microgrid side, described interconnection is provided with second switch chopper on the position of described supplier's microgrid side, wherein
Described party in request microgrid is used for:
Receive the order connecting described interconnection that network scheduling system sends；
Detect on described interconnection near the circuit of described party in request's microgrid side whether without pressing；
If described circuit detected without pressure, connect described first switch disconnector, and send the information without pressing lock to described network scheduling system；
Described supplier's microgrid is used for:
Receive the order connecting described interconnection that network scheduling system sends；
The instruction increasing generated output is issued so that total load reaches the second predetermined power threshold value with total power difference generated electricity to distributed energy equipment；
If total load reaches the second predetermined power threshold value with total power difference generated electricity, detect whether described supplier's microgrid meets syn-collisional granite condition；
If described supplier's microgrid meets syn-collisional granite condition, connect described second switch chopper, and send the information having pressing lock to described network scheduling system；
Described network scheduling system is used for:
When determining that two microgrids meet interconnection condition, send the order of closing operation to party in request's microgrid；
After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；
The interconnection receiving described supplier's microgrid feedback couples successful information.
The method and system of micro-internetworking that the embodiment of the present invention provides, when determining that two microgrids meet interconnection condition, network scheduling system sends the order of closing operation to party in request's microgrid；After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；Then, network scheduling system receives the successful information of connection of described supplier's microgrid feedback.This party in request microgrid is first without pressing lock, and the process of combined floodgate after supplier's microgrid so that be interconnected at when not having a power failure to carry out between microgrid, and can overcome the problem that rush of current is big when micro-internetworking, thus ensureing power supply quality when microgrid couples.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, 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 premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
A kind of schematic flow sheet of the method for micro-internetworking that Fig. 1 provides for the embodiment of the present invention one；
Fig. 2 is a kind of electrical communication illustrative diagram in system between microgrid；
A kind of schematic flow sheet of the method for micro-internetworking that Fig. 3 provides for the embodiment of the present invention two；
A kind of schematic flow sheet of the method for micro-internetworking that Fig. 4 provides for the embodiment of the present invention three；
A kind of system architecture schematic diagram of the microgrid interacted system that Fig. 5 provides for the embodiment of the present invention four.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
The embodiment of the present invention one provides a kind of method of micro-internetworking, is applied to network scheduling system, as it is shown in figure 1, the method comprises the following steps:
S11, network scheduling system, when determining that two microgrids meet interconnection condition, send the order of closing operation to party in request's microgrid.
In this step, first, network scheduling systematic analysis judges the supply and demand complementary case within following a period of time of two microgrids in each microgrid, to determine whether two microgrids have demand for interconnection.Determine that said two microgrid has demand for interconnection and namely determines that said two microgrid can interconnect.Then, network scheduling system sends the order of closing operation to party in request's microgrid, so that party in request's microgrid first completes closing operation.
Optionally, in one particular embodiment of the present invention, it is determined that two microgrids meet interconnection condition can specifically, determine that having demand for interconnection and said two microgrid to meet between two microgrids closes a floodgate requirement with frequency.
Above-mentioned steps determines that having demand for interconnection and said two microgrid to meet between two microgrids requires to may particularly include again following steps with frequency combined floodgate:
111, the real-time running data according to each microgrid, analyzes two microgrids judged in each microgrid described supply and demand complementary case within following a period of time, to determine whether said two microgrid has demand for interconnection；
112, when determining that said two microgrid has demand for interconnection, it is determined that whether meet with requirement of frequently closing a floodgate between said two microgrid；
If meeting with requirement of frequently closing a floodgate between 113 said two microgrids, send control instruction to indicate said two microgrid to perform interconnection to said two microgrid.
Wherein, specifically, analyze two microgrids judged in each microgrid described supply and demand complementary case within following a period of time can be specially, network scheduling system is according to the real-time traffic information sent on each microgrid, each microgrid is often separated by a period of time carries out power prediction, and judge according to power prediction interpretation of result generating capacity and the electric power of said two microgrid each microgrid within following a period of time to thereby determine that supplier's microgrid and demanding party's microgrid.Specifically, network scheduling system is according to the condition such as weather, historical data, and a period of time of being often separated by carries out the power prediction of the systems such as microgrid.Wherein may be configured as 15 minutes levels, 2 hours levels, 24 hours levels, the prediction of four intervals of 48 hours levels at set intervals.Then, network scheduling system, according to power prediction result, can differentiate generating capacity and the electric power of each microgrid in following a period of time.The generating capacity of microgrid is more than a certain setting threshold value of electric power, it is determined that this microgrid is supplier's microgrid, it is preferable that this threshold value should be set to more than the 50% of rated power.Meanwhile, if the generating capacity of microgrid is less than a certain setting threshold value of electric power, it may be determined that this microgrid is demanding party's microgrid, it is preferable that this threshold value should be designed to less than the 20% of rated power.Additionally, what generating capacity and electric power took is the predicted mean vote in following a period of time.Following a period of time specifically can be set according to practical situation by those skilled in the art, for instance is set to following 4 hours etc..
Then, determine between said two microgrid that whether meet can specifically, determine that whether the electric voltage frequency of said two microgrid side is identical with frequency combined floodgate requirement in network scheduling system.When the electric voltage frequency of said two microgrid side is identical, network scheduling system sends control instruction to indicate two microgrids to perform interconnection to said two microgrid.If the electric voltage frequency of two microgrid sides is different, then network scheduling system would not instruct that the two microgrid performs interconnection.
S12, network scheduling system, after the order sending closing operation to party in request's microgrid, send the order of closing operation through default a period of time to supplier's microgrid.
In this step, in network scheduling system after the order sending closing operation to party in request's microgrid, if party in request's microgrid completes closing operation in Preset Time, then party in request's microgrid directly sends, to network scheduling system, the successful feedback information that closes a floodgate, after network scheduling system receives this feedback information, then send the order of closing operation immediately to supplier's microgrid.Thus, it will be appreciated that, a period of time preset in this step is primarily referred to as party in request's microgrid and completes the time used by closing operation, and this time may be configured as 5s, 7s, 10s etc., and this present invention is not limited.
S13, network scheduling system receive the successful information of connection of supplier's microgrid feedback.
In this step, after network scheduling system sends the order of closing operation to supplier's microgrid, supplier's microgrid can carry out and party in request's microgrid closing operation accordingly, if closing a floodgate interconnects successfully, supplier's microgrid can couple successful information to network scheduling system feedback supplier's microgrid with party in request microgrid, and then network scheduling system issues the instruction of power exchange to supplier's microgrid and party in request's microgrid.If closing a floodgate interconnects unsuccessfully, then supplier's microgrid can couple failed information to network scheduling system feedback, to inform that supplier's microgrid can not with party in request's microgrid interconnection to network scheduling system.
Optionally, in one particular embodiment of the present invention, after receiving the successful information of connection of supplier's microgrid feedback, the method is further comprising the steps of:
Network scheduling system sends active power upper and lower limit parameter to supplier's microgrid, in order to supplier's microgrid according to active power upper and lower limit parameter to party in request's microgrid supplying energy.
The method of micro-internetworking that the embodiment of the present invention one provides, is applied to network scheduling system, including: when determining that two microgrids meet interconnection condition, network scheduling system sends the order of closing operation to party in request's microgrid；After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；Then, network scheduling system receives the successful information of connection of described supplier's microgrid feedback.This party in request microgrid is first without pressing lock, and the process of combined floodgate after supplier's microgrid so that be interconnected at when not having a power failure to carry out between microgrid, and can overcome the problem that rush of current is big when micro-internetworking, thus ensureing power supply quality when microgrid couples.
Optionally, in one particular embodiment of the present invention, after network scheduling system receives the successful information of connection of supplier's microgrid feedback, the method is further comprising the steps of:
141, network scheduling system is when determining that two microgrids no longer meet interconnection condition, sends the order of sub-switching operation to supplier's microgrid；
142, after the order sending sub-switching operation to supplier's microgrid, through a period of time preset, network scheduling system sends the order of sub-switching operation to party in request's microgrid；
143, network scheduling system receives the information that the separating brake of party in request's microgrid feedback disconnects.
Wherein, a period of time preset is primarily referred to as supplier's microgrid and completes the time used by sub-switching operation, and this time may be configured as 5s, 7s, 10s etc., and this present invention is not limited.
Embodiment two
The embodiment of the present invention two provides a kind of method of micro-internetworking, it is applied to party in request's microgrid, as shown in Figure 2, it is provided with interconnection between party in request's microgrid and supplier's microgrid, described interconnection is provided with the first switch disconnector on the position of party in request's microgrid side, such as K1 switch disconnector.As it is shown on figure 3, the method comprises the following steps:
S21, party in request's microgrid receive the order connecting interconnection that network scheduling system sends.
Specifically, when network scheduling system judges that two microgrid interconnection conditions are set up, network scheduling system sends the order of closing operation to party in request's microgrid.That is, party in request's microgrid receives the order connecting interconnection that network scheduling system sends.
On S22, party in request's microgrid detection interconnection, whether the circuit near party in request's microgrid side is without pressure.
Optionally, in one particular embodiment of the present invention, when being provided with first line voltage transformer in the first switch disconnector position, then step S22 detects on described interconnection near whether the circuit of described party in request's microgrid side may particularly include following steps without pressure:
Voltage is gathered, it is determined that the virtual value of the three-phase average voltage of party in request's microgrid side is whether less than the preset ratio of the rated voltage of party in request's microgrid side by first line voltage transformer.This preset ratio may be provided in the scope of 10% to 50%, for instance is set to 10%, 45%, 50% etc..
Wherein, the rated voltage of party in request's microgrid side is the rated voltage at the first switch disconnector place.Such as this rated voltage is 10kV, 35kV etc..
If S23, party in request's microgrid detect that circuit is without pressure, connect the first switch disconnector, and send the information without pressing lock to network scheduling system.
Wherein, carry out at microgrid place of party in request without pressure closing operation, it is possible to make, when two microgrids couple, when normal power supply, to reduce the impact of electric current, thus ensureing power supply quality when microgrid couples.
The method of micro-internetworking that the embodiment of the present invention two provides, it is applied to party in request's microgrid, it is provided with interconnection between party in request's microgrid and supplier's microgrid, interconnection is provided with the first switch disconnector on the position of described party in request's microgrid side, including: party in request's microgrid receives the order connecting described interconnection that network scheduling system sends；And detect on described interconnection near the circuit of described party in request's microgrid side whether without pressing；If detecting, described circuit is without pressure, connects described first switch disconnector, and sends the information without pressing lock to network scheduling system.Thus, this detected before combined floodgate by party in request's microgrid on interconnection near the circuit of party in request's microgrid side whether without the mode pressed, it is possible to overcome the problem that rush of current is big when micro-internetworking, thus ensureing power supply quality when microgrid couples.
Alternatively, in embodiments of the present invention, can being additionally provided with first line current transformer in the first switch disconnector position, first line current transformer is used for gathering electric current.Then after step S23 sends the information without pressing lock to network scheduling system, further comprising the steps of:
241, party in request's microgrid receives the order disconnecting interconnection that network scheduling system sends.
242, the voltage gathered according to the electric current of first line current transformer collection and first line voltage transformer, party in request's microgrid determines the power on interconnection；
243, whether the power on the more described interconnection determined of party in request's microgrid is less than the first predetermined power threshold value.
Wherein, the power on interconnection can be specially the active power on interconnection.Specifically, party in request's microgrid collection the primary Calculation service data on the interconnection of party in request's microgrid side, these service datas can be sent to network scheduling system so that it determines the active power on the interconnection of party in request's microgrid side according to described Operational Data Analysis by following party in request microgrid.Then, analysis result is handed down to party in request's microgrid by network scheduling system, and party in request's microgrid determines that whether the numerical value of this active power is less than the first predetermined power threshold value.Wherein the first predetermined power threshold value may be configured as any number between 0-20kW, for instance 20kW.
If the power on 244 described interconnections is less than the first predetermined power threshold value, party in request's microgrid turns off described first switch disconnector, and sends the information of separating brake to described network scheduling system.
Embodiment three
The embodiment of the present invention three provides a kind of method of micro-internetworking, it is applied to supplier's microgrid, as shown in Figure 2, it is provided with interconnection between party in request's microgrid and supplier's microgrid, described interconnection is provided with second switch chopper on the position of described supplier's microgrid, such as K2 switch disconnector.As shown in Figure 4, the method comprises the following steps:
S31, supplier's microgrid receive the order connecting described interconnection that network scheduling system sends.
After party in request's microgrid closes a floodgate, network scheduling system sends supplier's microgrid side to supplier's microgrid and connects the order of interconnection.
S32, supplier's microgrid issue the instruction increasing generated output to distributed energy equipment so that total load reaches the second predetermined power threshold value with total power difference generated electricity.
Wherein, the second predetermined power threshold value can be set to 50kW.
Optionally, in one particular embodiment of the present invention, the instruction increasing generated output is issued to distributed energy equipment in step S32 so that after total load and total power difference generated electricity reach the second predetermined power threshold value, further comprising the steps of:
Step 32 ', when the power difference of total load with total generating reaches the second predetermined power threshold value, detect whether the circuit of close supplier's microgrid side on described interconnection has pressure.
By above-mentioned steps 32 ', namely supplier's microgrid is by detecting the voltage of interconnection, just can judge that party in request's microgrid closes a floodgate, thus can determine that supplier's microgrid is complete combined floodgate again, thus improving the safety that microgrid closes a floodgate.
Further, in one particular embodiment of the present invention, second switch circuit breaker position place is provided with the second line voltage distribution transformer, then on supplier's microgrid detection interconnection, whether the circuit of close supplier's microgrid side has pressure to specifically include:
Voltage is gathered, it is determined that the three-phase voltage of party in request's microgrid side is whether more than the preset ratio of the rated voltage of described party in request's microgrid side by described second line voltage distribution transformer.Wherein, preset ratio may be configured as 70%, 90%, 95% etc..
If S33, supplier's microgrid detect when the circuit of supplier's microgrid side has pressure, between detection supplier's microgrid and party in request's microgrid, whether meet syn-collisional granite condition.
Optionally, in one particular embodiment of the present invention, whether meet syn-collisional granite condition between detection supplier's microgrid and party in request's microgrid and specifically include herein below:
1) on detection interconnection three-phase voltage near supplier's microgrid side whether more than the preset ratio of the rated voltage of supplier's microgrid side；Wherein preset ratio may be configured as 90%.
2) whether the absolute value of the active power at the points of common connection place between electrical network and supplier's microgrid or party in request's microgrid is less than the 3rd predetermined power threshold value；Wherein the 3rd predetermined power threshold value may be configured as 50kW.
3) whether the difference on the frequency of party in request's microgrid side and supplier's microgrid side is less than predeterminated frequency threshold value；Wherein predeterminated frequency threshold value may be configured as 0.02Hz.And,
4) whether the voltage phase difference of party in request's microgrid side and supplier's microgrid side is less than predeterminated voltage phase threshold, and whether the changing value of described voltage phase difference is less than or equal to predeterminated voltage phase place change threshold.Wherein, predeterminated voltage phase threshold may be configured as 30 °, and predeterminated voltage phase place change threshold can be set to 5 °/s.
Optionally, in step 32 ' basis on, step S33 particularly as follows:
If detecting when the circuit of supplier's microgrid side has pressure, between detection supplier's microgrid and party in request's microgrid, whether meet syn-collisional granite condition.
If meeting syn-collisional granite condition between S34 supplier's microgrid and party in request's microgrid, supplier's microgrid connects second switch chopper, and sends the information having pressing lock to network scheduling system.
The method of micro-internetworking that the embodiment of the present invention three provides, it is applied to supplier's microgrid, it is provided with interconnection between supplier's microgrid and party in request's microgrid, described interconnection is provided with second switch chopper on the position of supplier's microgrid, including: supplier's microgrid receives the order connecting described interconnection that network scheduling system sends；And the instruction increasing generated output is issued to distributed energy equipment so that total load reaches the second predetermined power threshold value with total power difference generated electricity；If total load reaches the second predetermined power threshold value with total power difference generated electricity, detect whether meet syn-collisional granite condition between described supplier's microgrid and described party in request microgrid；If meeting syn-collisional granite condition between supplier's microgrid and party in request's microgrid, connecting described second switch chopper, and sending the information having pressing lock to network scheduling system.Thus, by this increase generated output and determine the mode meeting syn-collisional granite condition between supplier's microgrid and party in request's microgrid, it is possible to overcome the problem that rush of current is big when micro-internetworking, thus ensureing power supply quality when microgrid couples.
Additionally, optional, in one particular embodiment of the present invention, it is additionally provided with the second line current transformer at described second switch circuit breaker position place, described second line current transformer is used for gathering electric current；Then after the described information having pressing lock to the transmission of described network scheduling system, described method also includes:
351, the order disconnecting described interconnection that described network scheduling system sends is received；
352, issue the instruction reducing generated output to distributed energy equipment, make the power on described interconnection less than the 4th predetermined power threshold value；Wherein, the 4th predetermined power threshold value may be configured as any number between 0～20kW, and the present invention is not specifically limited.
353, the voltage gathered according to the electric current of the second line current transformer collection and the second line voltage distribution transformer, it is determined that the power on described interconnection；
If the power on 354 described interconnections is less than the 4th predetermined power threshold value, turns off described second switch chopper, and send the information of separating brake to described network scheduling system.
Embodiment four
The embodiment of the present invention four provides a kind of microgrid interacted system 40, as shown in Figure 5, system 40 includes at least two microgrid 401, network scheduling system 402 and interconnection 403, interconnection 403 is for connection requirement side microgrid 401a and supplier microgrid 401b, interconnection 403 is provided with the first switch disconnector K1 on the position of party in request microgrid 401a side, interconnection 403 is provided with second switch chopper K2 on the position of supplier microgrid 401b side, wherein
Party in request microgrid 401a is used for:
Receive the order connecting interconnection 403 that network scheduling system 402 sends；
On detection interconnection 403, whether the circuit near described party in request's microgrid side is without pressure；
If described circuit detected without pressure, connect the first switch disconnector K1, and send the information without pressing lock to network scheduling system 402；
Supplier microgrid 401b is used for:
Receive the order connecting interconnection 403 that network scheduling system 402 sends；
The instruction increasing generated output is issued so that total load reaches the second predetermined power threshold value with total power difference generated electricity, for instance 50KW to distributed energy equipment 404；
If total load and total power difference generated electricity reach the second predetermined power threshold value, whether detection supplier microgrid 401b meets syn-collisional granite condition；
If supplier microgrid 401b meets syn-collisional granite condition, connect second switch chopper K2, and send the information having pressing lock to network scheduling system 402；
Network scheduling system 402 is used for:
When determining that two microgrids meet interconnection condition, send the order of closing operation to party in request microgrid 401a；
After the order sending closing operation to party in request microgrid 401a, send the order of closing operation through default a period of time to supplier microgrid 401b；
The interconnection receiving supplier microgrid 401b feedback couples successful information.
The microgrid interacted system 40 that the embodiment of the present invention four provides, this system includes at least two microgrid 401, network scheduling system 402 and interconnection 403, wherein, first, network scheduling system 402, when determining that two microgrids meet interconnection condition, sends the order of closing operation to party in request microgrid 401a.Party in request microgrid 401a receives the order connecting interconnection 403 that network scheduling system 402 sends；And detect on interconnection 403 near the circuit of described party in request's microgrid side whether without pressing；If described circuit detected without pressure, connect the first switch disconnector K1, and send the information without pressing lock to network scheduling system 402.It follows that network scheduling system 402 sends the order of closing operation to supplier microgrid 401b.Supplier microgrid 401b receives the order connecting interconnection 403 that network scheduling system 402 sends；And the instruction increasing generated output is issued to distributed energy equipment 404 so that total load reaches the second predetermined power threshold value with total power difference generated electricity；If total load and total power difference generated electricity reach the second predetermined power threshold value, whether detection supplier microgrid 401b meets syn-collisional granite condition；If supplier microgrid 401b meets syn-collisional granite condition, connect second switch chopper K2, and send the information having pressing lock to network scheduling system 402.It can thus be seen that, this party in request microgrid is first without pressing lock, the process of pressing lock is had after supplier's microgrid, and determine, between kind supplier's microgrid and party in request's microgrid, the mode meeting syn-collisional granite condition, the problem that rush of current is big when micro-internetworking can be overcome, thus ensureing power supply quality when microgrid couples.
Optionally, in one particular embodiment of the present invention, interconnection 403 being additionally provided with transformator 4031, the low-pressure side of transformator is connected with the low-voltage bus bar of supplier microgrid 401b, and the high-pressure side of transformator 4031 is connected with the high voltage bus of party in request microgrid 401a；Or
The low-pressure side of transformator 4031 is connected with the low-voltage bus bar of party in request microgrid 401a, and the high-pressure side of transformator 4031 is connected with the high voltage bus of supplier microgrid 401b.
Now, second switch chopper K2 can be linked circuit breaker, for instance on the interconnection of supplier's microgrid side, and there are two disconnect switchs at the two ends of transformator 4031, second switch chopper K2 control to simultaneously turn off, be also turned on.
Optionally, in one particular embodiment of the present invention, the capacity of transformator 4031 is configured to be all higher than 1:2 with the ratio of party in request microgrid 401a, the main transformer capacity of supplier microgrid 401b.
Optionally, in one particular embodiment of the present invention, the two ends of interconnection 403 are additionally provided with current quick, realize circuit relay protection with this.
Optionally, in one particular embodiment of the present invention, it is additionally provided with first line voltage transformer and first line current transformer in the first switch disconnector K1 position, wherein, first line voltage transformer is for gathering the voltage analog data of party in request microgrid 401a side, and first line current transformer is for gathering the current-mode analog quantity data of party in request microgrid 401a side；And, it is additionally provided with the second line voltage distribution transformer and the second line current transformer in described second switch chopper K2 position, wherein, second line voltage distribution transformer is for gathering the voltage analog data of supplier microgrid 401b side, and the second line current transformer is for gathering the current-mode analog quantity data of supplier microgrid 401b side.
The current-mode analog quantity data of current-mode analog quantity data and supplier microgrid 401b side by gathering party in request microgrid 401a side, calculate the power of party in request microgrid 401a side and supplier microgrid 401b side then.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (18)
1. a method for micro-internetworking, is applied to network scheduling system, it is characterised in that including:
When determining that two microgrids meet interconnection condition, send the order of closing operation to party in request's microgrid；Wherein, described network scheduling systematic analysis judges the supply and demand complementary case within following a period of time of two microgrids in each microgrid, to determine whether two microgrids can interconnect；
After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；
Receive the successful information of connection of described supplier's microgrid feedback.
2. method according to claim 1, it is characterised in that after receiving the successful information of connection of described supplier's microgrid feedback, described method also includes:
Send active power upper and lower limit parameter to described supplier's microgrid, in order to described supplier's microgrid according to described active power upper and lower limit parameter to described party in request microgrid supplying energy.
3. method according to claim 1, it is characterised in that described determine that two microgrids meet interconnection condition specifically, determine that having demand for interconnection and said two microgrid to meet between two microgrids closes a floodgate requirement with frequency.
4. method according to claim 3, it is characterised in that described determine that having demand for interconnection and said two microgrid to meet between two microgrids specifically includes with frequency combined floodgate requirement:
Real-time running data according to each microgrid, analyzes two microgrids judged in each microgrid described supply and demand complementary case within following a period of time, to determine whether said two microgrid has demand for interconnection；
When determining that said two microgrid has demand for interconnection, it is determined that whether meet with requirement of frequently closing a floodgate between said two microgrid；
If meeting with requirement of frequently closing a floodgate between said two microgrid, send control instruction to indicate said two microgrid to perform interconnection to said two microgrid.
5. method according to claim 1, it is characterised in that after the successful information of connection of described reception described supplier microgrid feedback, described method also includes:
When determining that two microgrids no longer meet interconnection condition, send the order of sub-switching operation to described supplier's microgrid；
After the order sending sub-switching operation to described supplier's microgrid, send the order of sub-switching operation through default a period of time to party in request's microgrid；
Receive the information that the separating brake of described party in request microgrid feedback disconnects.
6. the method for a micro-internetworking, it is applied to party in request's microgrid, it is characterized in that, it is provided with interconnection between described party in request microgrid and supplier's microgrid, described interconnection is provided with the first switch disconnector on the position of described party in request's microgrid side, wherein, described party in request microgrid and described supplier's microgrid are defined as there is supply and demand complementation within following a period of time by network scheduling system, and described method includes:
Receive the order connecting described interconnection that described network scheduling system sends；
Detect on described interconnection near the circuit of described party in request's microgrid side whether without pressing；
If detecting, described circuit is without pressure, connects described first switch disconnector, and sends the information without pressing lock to described network scheduling system.
7. method according to claim 6, it is characterised in that
Described first switch disconnector position is provided with first line voltage transformer,
Near whether the circuit of described party in request's microgrid side specifically includes without pressure on the described interconnection of described detection:
Voltage is gathered, it is determined that the virtual value of the three-phase average voltage of described party in request's microgrid side is whether less than the preset ratio of the rated voltage of described party in request's microgrid side by described first line voltage transformer.
8. method according to claim 7, it is characterised in that
Being additionally provided with first line current transformer in described first switch disconnector position, described first line current transformer is used for gathering electric current；
After the described information to the transmission of described network scheduling system without pressing lock, described method also includes:
Receive the order disconnecting described interconnection that described network scheduling system sends；
The voltage that the electric current gathered according to described first line current transformer and described first line voltage transformer gather, it is determined that the power on described interconnection；
Relatively whether described power is less than the first predetermined power threshold value；
If the power on described interconnection is less than the first predetermined power threshold value, turns off described first switch disconnector, and send the information of separating brake to described network scheduling system.
9. the method for a micro-internetworking, it is applied to supplier's microgrid, it is characterized in that, it is provided with interconnection between described supplier's microgrid and party in request's microgrid, described interconnection is provided with second switch chopper on the position of described supplier's microgrid, wherein, described party in request microgrid and described supplier's microgrid are defined as there is supply and demand complementation within following a period of time by network scheduling system, and described method includes:
Receive the order connecting described interconnection that network scheduling system sends；
The instruction increasing generated output is issued so that total load reaches the second predetermined power threshold value with total power difference generated electricity to distributed energy equipment；
If total load reaches the second predetermined power threshold value with total power difference generated electricity, detect whether meet syn-collisional granite condition between described supplier's microgrid and described party in request microgrid；
If meeting syn-collisional granite condition between described supplier's microgrid and described party in request microgrid, connecting described second switch chopper, and sending the information having pressing lock to described network scheduling system.
10. method according to claim 9, it is characterised in that in the described instruction issuing to distributed energy equipment and increasing generated output so that after total load and total power difference generated electricity reach the second predetermined power threshold value, described method also includes:
When the power difference of total load with total generating reaches the second predetermined power threshold value, detect whether the circuit of close described supplier's microgrid side on described interconnection has pressure；
If then total load reaches the second predetermined power threshold value with the power difference of total generating, detect whether meet syn-collisional granite condition between described supplier's microgrid and described party in request microgrid particularly as follows:
If detecting when the circuit of described supplier's microgrid side has pressure, detect whether meet syn-collisional granite condition between described supplier's microgrid and described party in request microgrid.
11. method according to claim 10, it is characterised in that
Described second switch circuit breaker position place is provided with the second line voltage distribution transformer,
On the described interconnection of described detection, whether the circuit near described supplier's microgrid side has pressure to specifically include:
Voltage is gathered, it is determined that the three-phase voltage of described party in request's microgrid side is whether more than the preset ratio of the rated voltage of described party in request's microgrid side by described second line voltage distribution transformer.
12. method according to claim 9, it is characterised in that whether meet syn-collisional granite condition between described detection described supplier microgrid and described party in request microgrid and specifically include:
Detect on described interconnection near the three-phase voltage of described supplier's microgrid side whether more than the preset ratio of the rated voltage of described supplier's microgrid side；
Whether the absolute value of the active power at the points of common connection place between electrical network and described supplier's microgrid or described party in request microgrid is less than the 3rd predetermined power threshold value；
Whether the difference on the frequency of described party in request's microgrid side and described supplier's microgrid side is less than predeterminated frequency threshold value；And,
Whether the voltage phase difference of described party in request's microgrid side and described supplier's microgrid side is less than predeterminated voltage phase threshold, and whether the changing value of described voltage phase difference is less than or equal to predeterminated voltage phase place change threshold.
13. method according to claim 11, it is characterised in that
Be additionally provided with the second line current transformer at described second switch circuit breaker position place, described second line current transformer is used for gathering electric current；
After the described information having pressing lock to the transmission of described network scheduling system, described method also includes:
Receive the order disconnecting described interconnection that described network scheduling system sends；
Issue the instruction reducing generated output to distributed energy equipment, make the power on described interconnection less than the 4th predetermined power threshold value；
The voltage that the electric current gathered according to described second line current transformer and described second line voltage distribution transformer gather, it is determined that the power on described interconnection；
If the power on described interconnection is less than the 4th predetermined power threshold value, turns off described second switch chopper, and send the information of separating brake to described network scheduling system.
14. a microgrid interacted system, it is characterized in that, described system includes at least two microgrid, network scheduling system and interconnection, described interconnection is used for connection requirement side's microgrid and supplier's microgrid, described interconnection is provided with the first switch disconnector on the position of described party in request's microgrid side, described interconnection is provided with second switch chopper on the position of described supplier's microgrid side, wherein
Described party in request microgrid is used for:
Receive the order connecting described interconnection that described network scheduling system sends；
Detect on described interconnection near the circuit of described party in request's microgrid side whether without pressing；
If described circuit detected without pressure, connect described first switch disconnector, and send the information without pressing lock to described network scheduling system；
Described supplier's microgrid is used for:
Receive the order connecting described interconnection that described network scheduling system sends；
The instruction increasing generated output is issued so that total load reaches the second predetermined power threshold value with total power difference generated electricity to distributed energy equipment；
If total load reaches the second predetermined power threshold value with total power difference generated electricity, detect whether described supplier's microgrid meets syn-collisional granite condition；
If described supplier's microgrid meets syn-collisional granite condition, connect described second switch chopper, and send the information having pressing lock to described network scheduling system；
Described network scheduling system is used for:
When determining that two microgrids meet interconnection condition, send the order of closing operation to party in request's microgrid；
After the order sending closing operation to described party in request microgrid, send the order of closing operation through default a period of time to supplier's microgrid；
The interconnection receiving described supplier's microgrid feedback couples successful information.
15. system according to claim 14, it is characterised in that be additionally provided with transformator on described interconnection,
The low-pressure side of described transformator is connected with the low-voltage bus bar of described supplier's microgrid, and the high-pressure side of described transformator is connected with the high voltage bus of described party in request microgrid；Or
The low-pressure side of described transformator is connected with the low-voltage bus bar of described party in request microgrid, and the high-pressure side of described transformator is connected with the high voltage bus of described supplier's microgrid.
16. system according to claim 15, it is characterised in that the capacity of described transformator is configured to be all higher than 1:2 with the ratio of described party in request microgrid, the main transformer capacity of supplier's microgrid.
17. system according to claim 14, it is characterised in that the two ends of described interconnection are additionally provided with current quick.
18. system according to claim 14, it is characterised in that
It is additionally provided with first line voltage transformer and first line current transformer in described first switch disconnector position, wherein, described first line voltage transformer is for gathering the voltage analog data of described party in request's microgrid side, and described first line current transformer is for gathering the current-mode analog quantity data of described party in request's microgrid side；And,
The second line voltage distribution transformer and the second line current transformer it is additionally provided with at described second switch circuit breaker position place, wherein, described second line voltage distribution transformer is for gathering the voltage analog data of described supplier's microgrid side, and described second line current transformer is for gathering the current-mode analog quantity data of described supplier's microgrid side.
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| CN106253346B (en) * | 2016-09-12 | 2018-11-30 | 新奥科技发展有限公司 | A kind of control method of electric power networks, apparatus and system |
| CN106684904B (en) * | 2016-11-17 | 2019-07-16 | 新奥泛能网络科技股份有限公司 | The method and micro-capacitance sensor of the electrical networking of distributed busbar protection, medium-sized energy network |
| CN107482634B (en) * | 2017-08-24 | 2019-08-30 | 上海交通大学 | A kind of more microgrid flexible interconnection systems and its control method |
| CN111884339A (en) * | 2020-07-24 | 2020-11-03 | 贵州电网有限责任公司 | Judgment method and system based on self-adaptive switch action |
| CN113394770A (en) * | 2021-05-31 | 2021-09-14 | 南方电网海上风电联合开发有限公司 | Interconnected micro-grid group frequency complete distribution type optimization control method and system |
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| CN103647343A (en) * | 2013-12-25 | 2014-03-19 | 国家电网公司 | Improvement method for spare power automatic switching operating mode of internal bridging line transformer substation |
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| CN203632361U (en) * | 2013-12-27 | 2014-06-04 | 国家电网公司 | Logic controlling device for 110kV line automatic bus transfer equipment |
| CN104113141B (en) * | 2014-07-30 | 2016-06-22 | 国网电力科学研究院 | A kind of intelligence longitudinally interconnects feeder automation control method |
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