CN104393602A - Adjusting method and device for distributed energy resource network - Google Patents
Adjusting method and device for distributed energy resource network Download PDFInfo
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- CN104393602A CN104393602A CN201410764962.4A CN201410764962A CN104393602A CN 104393602 A CN104393602 A CN 104393602A CN 201410764962 A CN201410764962 A CN 201410764962A CN 104393602 A CN104393602 A CN 104393602A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
Abstract
The invention discloses an adjusting method and device for a distributed energy resource network, and relates to the technical field of power electronics. With adoption of the adjusting method and device for the distributed energy resource network, influence on the distributed energy resource network due to sudden power outage of a call wire or a power supply line of a micro-grid in the distributed energy resource network can be eliminated, and the influence on the distributed energy resource network due to random variation of electric points is reduced, so that the stability of the distributed energy resource network is guaranteed. The adjusting method of the distributed energy resource network comprises steps as follows: a detection unit detects a destroy source destroying stability of the distributed energy resource network, and when the detection unit detects the destroy unit, the micro-grid and a network scheduling system of the distributed energy resource network adjust the distributed energy resource network.
Description
Technical field
The present invention relates to field of power electronics, particularly relate to a kind of control method and device of distributed energy network.
Background technology
Distributed energy is the energy supply mode being arranged on user side, and it combines with customer charge, forms the energy supply and demand relation of " point-to-point ".Wherein, the energy comprises solar energy, wind energy etc., because the above-mentioned energy is by the impact of the factors such as weather, thus the energy supply and demand relation of " point-to-point " cannot be met consumers' demand, for solving this problem, can by multiple distributed energy and multiple customer charge composition micronet (hereinafter referred to as " microgrid ").Usually, microgrid can be accessed by bulk power grid and is incorporated into the power networks, and supports each other with bulk power grid.
Because the load rule of adjacent microgrid is different, thus by interconnected for adjacent microgrid formation distributed energy network to provide reserve capacity mutually, thus energy match degree can be improved.And the distributed generation system that microgrid can also be combined (comprising) around, formed widely across garden, distributed energy network across microgrid, can further improve energy match degree, now, by controlling distributed energy network, the utilization of the energy can be made more efficient, economical.
Inventor finds, following problem is at least there is: when the interconnection in distributed energy network between microgrid breaks down or the supply line of microgrid breaks down in bulk power grid side in the process running distributed energy network, when causing unexpected power-off, instantaneous Charger transfer can be caused, adjacent microgrid is collapsed, even makes the trend of whole network redistribute; And in distributed energy network some electrically point be subject to the change that the impact of the factors such as weather can be random as simple distribution formula electricity generation systems such as roof photovoltaics, the safe operation that thus may exceed distributed energy network is interval, thus affects the Electrical Safety of user and affect the normal operation of distributed energy network.
Summary of the invention
The embodiment of the present invention provides a kind of control method and device of distributed energy network, the unexpected power-off of microgrid interconnection or supply line can be eliminated change at random is electrically put on the impact of distributed energy network to the impact of distributed energy network and reduction, thus ensure the stability of distributed energy network.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
On the one hand, provide a kind of control method of distributed energy network, comprising:
Detecting unit detects the destruction source of described distributed energy network stabilization;
When described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher regulate described distributed energy network.
Particularly, described destruction source comprises:
Rapid damage source, described rapid damage source comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold; With
Destroy source at a slow speed, the described source of destruction at a slow speed comprises the destruction source that formation time is greater than described second time threshold.
Particularly, when described destruction source is described rapid damage source, described when described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher are carried out adjustment to described distributed energy network and are comprised:
When described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line, and described interconnection is between adjacent two described microgrids;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
Particularly, the destruction source that described detecting unit detects described distributed energy network stabilization comprises:
Detecting unit detects the exception of voltage and current of points of common connection, and the exception of the voltage and current of interconnection between the first microgrid and the second microgrid;
Then described when described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line and specifically comprises:
When described detecting unit detects that the voltage and current of described points of common connection is abnormal, and when detecting that the voltage and current of described interconnection is abnormal, through the time delay of the first Preset Time, described interconnection disconnects in described first microgrid side by described first microgrid;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher and specifically comprises:
Described first microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
Particularly, the voltage and current of described points of common connection is abnormal comprises:
The three-phase voltage of points of common connection is reduced to below preset voltage value in the second Preset Time, and the voltage change ratio of described three-phase voltage exceedes predeterminated voltage changing value; With
The electric current of points of common connection is reduced to below the first pre-set current value in the 3rd Preset Time.
Particularly, the destruction source that described detecting unit detects described distributed energy network stabilization also comprises:
Detecting unit detects the exception of the voltage and current of interconnection between the first microgrid and the second microgrid;
Then described when described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line and specifically comprises:
When described detecting unit detects that the voltage and current of described interconnection is abnormal, through the time delay of the 4th Preset Time, described interconnection disconnects in described second microgrid side by the second microgrid;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher and specifically comprises:
Described second microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
Particularly, between described microgrid, the exception of the voltage and current of interconnection comprises:
The overcurrent of interconnection between first microgrid and the second microgrid;
The electric voltage over press of interconnection between first microgrid and the second microgrid; Or
The under-voltage of interconnection between first microgrid and the second microgrid.
Particularly, between described first microgrid and the second microgrid, the overcurrent of interconnection comprises:
The electric current of the interconnection between the first microgrid and the second microgrid is more than the second pre-set current value; Or
The electric current of the interconnection between the first microgrid and the second microgrid rises, and in the 5th Preset Time, the change of described electric current is more than the 3rd pre-set current value.
Particularly, when described destruction source is the described source of destruction at a slow speed, described when described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher are carried out adjustment to described distributed energy network and are comprised:
When destroying at a slow speed source described in described detecting unit detects, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power to the described microgrid be associated;
Microgrid performs the operational factor of described active power and the operational factor of reactive power.
Particularly, detect the destruction source of described distributed energy network stabilization at described detecting unit before, also comprise:
Distributed energy network of network dispatching patcher carries out tidal current analysis to described distributed energy network;
The destruction source that then described detecting unit detects described distributed energy network stabilization specifically comprises:
Detecting unit, according to the analysis result of described tidal current analysis, detects described distributed energy network and whether there is trend and close on oppositely;
Described when destroying at a slow speed source described in described detecting unit detects, distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power is specially to the described microgrid that is associated:
When described detecting unit detect described distributed energy network exist trend close on reverse time, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the generated output upper limit to the described microgrid that is associated;
The operational factor of operational factor and reactive power that described microgrid performs the active power of described transmission is specially:
In the described microgrid be associated, at least one microgrid performs the generated output upper limit of described transmission.
Particularly, the destruction source of described detecting unit detection distributed energy network stabilization also comprises:
Detecting unit detects described distributed energy network and whether there is voltage deviation;
Then described when destroying at a slow speed source described in described detecting unit detects, described distributed energy network of network dispatching patcher selects the microgrid be associated, and is specially to the described microgrid transmission active power operational factor that is associated and reactive power operation parameter:
When described detecting unit detects that described distributed energy network exists described voltage deviation, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends reactive power desired value to the described microgrid be associated;
The operational factor of operational factor and reactive power that described microgrid performs described active power specifically comprises:
In the described microgrid be associated, at least one microgrid performs reactive power compensation.
On the other hand, provide a kind of adjusting device of distributed energy network, described device comprises:
Detecting unit, for detecting the destruction source of described distributed energy network stabilization;
Distributed energy network of network dispatching patcher, after described destruction source being detected, regulates described distributed energy network for described detecting unit;
Microgrid, after described destruction source being detected, regulates described distributed energy network for described detecting unit.
Particularly, described destruction source comprises:
Rapid damage source, described rapid damage source comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold;
Described microgrid is used for, and when described detecting unit detects described rapid damage source, regulates described distributed energy network;
With
Destroy source at a slow speed, the described source of destruction at a slow speed comprises the destruction source that formation time is greater than the second time threshold;
Described distributed energy network of network dispatching patcher is used for, and when destroying at a slow speed source described in described detecting unit detects, regulates described distributed energy network;
Described microgrid also for, after described distributed energy network of network dispatching patcher regulates described distributed energy network, described distributed energy network is regulated.
Particularly, when described destruction source is rapid damage source, described microgrid specifically for,
When described detecting unit detects described rapid damage source, carry out the operation of interconnection off-the-line, described interconnection is between adjacent two described microgrids;
Interconnection solution column information is sent to described distributed energy network of network dispatching patcher.
Particularly, described microgrid comprises the first microgrid and the second microgrid, when described destruction source is rapid damage source, described detecting unit specifically for,
Detect the exception of voltage and current of points of common connection, and detect the exception of voltage and current of the interconnection between the first microgrid and the second microgrid;
Described first microgrid specifically for,
When described detecting unit detects that the voltage and current of described points of common connection is abnormal, and when detecting that the voltage and current of described interconnection is abnormal, through the time delay of the first Preset Time, in described first microgrid side, described interconnection is disconnected;
Interconnection solution column information is sent to distributed energy network of network dispatching patcher.
Particularly, when the described destruction source detected is described rapid damage source, described detecting unit also for,
Detect the exception of the voltage and current of the interconnection between the first microgrid and the second microgrid;
Described second microgrid specifically for,
When described detecting unit detects that the voltage and current of described interconnection is abnormal, through the time delay of the 4th Preset Time, in described second microgrid side, described interconnection is disconnected;
Interconnection solution column information is sent to distributed energy network of network dispatching patcher.
Particularly, when described destruction source be described at a slow speed destroy source time, described distributed energy network of network dispatching patcher specifically for,
When destroying at a slow speed source described in described detecting unit detects, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power to the described microgrid be associated;
The described microgrid be associated specifically for, perform described distributed energy network of network dispatching patcher send the operational factor of active power and the operational factor of reactive power.
Particularly, detect the destruction source of described distributed energy network stabilization at described detecting unit before, also comprise:
Described distributed energy network of network dispatching patcher carries out tidal current analysis to described distributed energy network;
Described detecting unit specifically for, according to the analysis result of described tidal current analysis, detect described distributed energy network and whether there is trend and close on oppositely;
Then described distributed energy network of network dispatching patcher specifically for, when described detecting unit detect described distributed energy network exist trend close on reverse time, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the generated output upper limit to the described microgrid be associated;
In the described microgrid be associated at least one microgrid for, perform the described generated output upper limit.
Particularly, described detecting unit also for, detect described distributed energy network and whether there is voltage deviation;
Described distributed energy network of network dispatching patcher also for, when described detecting unit detects that described distributed energy network exists described voltage deviation, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends reactive power desired value to the described microgrid be associated;
In the described microgrid be associated at least one microgrid for, perform reactive power compensation.
The control method of distributed network provided by the invention and device, the destruction source of distributed energy network stabilization detected at detecting unit after, because microgrid has responding ability fast, thus can regulate distributed energy network fast, to eliminate the unexpected power-off of microgrid interconnection or supply line to the impact of distributed energy network; And the regional area of microgrid to distributed energy network can be combined due to distributed energy network of network dispatching patcher to regulate, thus can reduce electric some change at random in distributed energy network to the impact of distributed energy network, thus ensure the stability of distributed energy network.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment 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 prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The control method flow chart of the distributed energy network that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the distributed energy network that Fig. 2 provides for the embodiment of the present invention two;
Fig. 3 is a kind of control method flow chart when rapid damage source appears in distributed energy network that the embodiment of the present invention two provides;
Fig. 4 is another kind of control method flow chart when rapid damage source appears in distributed energy network that the embodiment of the present invention two provides;
There is a kind of control method flow chart when destroying at a slow speed source in the distributed energy network that Fig. 5 provides for the embodiment of the present invention two;
There is another kind of control method flow chart when destroying at a slow speed source in the distributed energy network that Fig. 6 provides for the embodiment of the present invention two;
The structural representation of the adjusting device of the distributed energy network that Fig. 7 provides for the embodiment of the present invention three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The control method of distributed energy network is applicable in the running of distributed energy network, wherein, distributed energy network comprises the microgrid in a region, usually, the principal radii in this region is no more than 10km, and microgrid can comprise the simple distribution formula electricity generation system of surrounding.As shown in Figure 1, the control method of this distributed energy network comprises:
Step S11, detecting unit detect the destruction source of distributed energy network stabilization.
Particularly, the destruction source of distributed energy network stabilization is divided into two kinds, the first destruction source is rapid damage source, and it comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold.For example, very first time threshold value is 0.1s, 0.2s, also can be other gsec, and the second time threshold is 30s, 60s, can be also other times of tens seconds, but the second time threshold is less than or equal to 60 seconds.The second destroys source for destroy source at a slow speed, and it comprises the destruction source that formation time is greater than the second time threshold.
Wherein, rapid damage source comprises the interconnection that microgrid connects between the line failure of higher level electrical network or adjacent microgrid and breaks down, and causes the situation of unexpected power-off; Source of destroying at a slow speed comprises electric point not controlled in distributed energy network and is subject to the impact of the uncertain factors such as weather as simple distribution formula electricity generation systems such as roof photovoltaics, exceeds the situation of distributed energy network operation scope.
Step S12, when detecting unit detects destruction source, microgrid and distributed energy network of network dispatching patcher regulate distributed energy network.
In this step, when the destruction source that detecting unit detects is rapid damage source, microgrid regulates distributed energy network.Particularly, when detecting unit detects rapid damage source, microgrid carries out the operation of interconnection off-the-line, and sends interconnection solution column information to distributed energy network of network dispatching patcher.Wherein, interconnection off-the-line is operating as microgrid and is disconnected by the interconnection between itself and adjacent microgrid; Microgrid sends interconnection solution column information to distributed energy network scheduling system, thus after above-mentioned interconnection disconnects a period of time, distributed energy network of network dispatching patcher can be again interconnected by above-mentioned interconnection, and the time that above-mentioned interconnection disconnects can be arranged according to actual conditions.
When the destruction source that detecting unit detects is for destroying at a slow speed source, microgrid and distributed energy network of network dispatching patcher regulate distributed energy network.Particularly, when detect destroy at a slow speed source time, distributed energy network of network dispatching patcher selects the microgrid be associated, to the microgrid transmission operational factor of active power and the operational factor of reactive power be associated; The microgrid be associated performs the active power of distributed energy network of network dispatching patcher transmission and the operational factor of reactive power; Next, when detecting unit still can detect that other destroy at a slow speed source, network scheduling reselects the microgrid be associated, and sends the operational factor of new active power and the operational factor of new reactive power to the microgrid be associated; The microgrid be associated reselected performs the new active power of distributed energy network of network dispatching patcher transmission and the operational factor of new reactive power.Said process moves to detecting unit and does not detect at a slow speed till destruction source.
For clearly demonstrating " microgrid be associated ", first briefly introduce the annexation of microgrid and higher level's electrical network.Higher level's electrical network is powered by transformer station's step-down transformer step-down rear line, and usually, Mei Tai transformer station step-down transformer can draw the supply line of more than 4 to each region, and Mei Tiao supply line connects multiple microgrid by a points of common connection.The determination methods of the microgrid be then associated is: judge whether the supply line at microgrid place belongs to same transformer station step-down transformer, such as, when 4 supply lines drawn by transformer station's step-down transformer, Mei Tiao supply line connects 2 microgrids by a points of common connection, then the supply line at these 8 microgrid places belongs to same transformer station step-down transformer, belongs to the microgrid be associated.
The control method of distributed energy network provided by the invention, the destruction source of distributed energy network stabilization detected at detecting unit after, because microgrid has responding ability fast, thus can regulate distributed energy network fast, to eliminate the unexpected power-off of interconnection between the supply line of microgrid and microgrid to the impact of distributed energy network; And because distributed energy network of network dispatching patcher associating microgrid can regulate the regional area of distributed energy network, thus can reduce electrically to put the impact of change at random on distributed energy network, thus ensure the stability of distributed energy network.
Embodiment two
Better understand the technical scheme of the control method of the distributed energy network that the embodiment of the present invention provides in order to those skilled in the art, be described in detail below by the control method of specific embodiment to distributed energy network provided by the invention.
In a specific embodiment of the present invention, a kind of distributed energy network shown in composition graphs 2, is illustrated the control method of distributed energy network.This distributed energy network comprises microgrid 1 and microgrid 2, and wherein, microgrid 1 comprises simple distributed generation system (not shown) as roof photovoltaic etc.Be connected by interconnection 3 between microgrid 1 and microgrid 2, wherein, interconnection 3 has the K switch 1 of microgrid 2 control and the K switch 2 of microgrid 1 control, microgrid 1 is connected with higher level's electrical network by same transformer station step-down transformer 4 with microgrid 2, thus microgrid 1 and the microgrid of microgrid 2 for being associated.Wherein, K switch 3 connects higher level's electrical network and microgrid 1, and K switch 3 is points of common connection, and K switch 4 connects higher level's electrical network and microgrid 2, and K switch 4 is points of common connection.Certainly, also have other unit in distributed energy network, for easy, do not illustrate one by one in figure.
As shown in Figure 3, when destruction source is rapid damage source, the control method of distributed energy network comprises:
Step 301, detecting unit detect the exception of voltage and current of points of common connection, and the exception of the voltage and current of interconnection between the first microgrid and the second microgrid.
For example, in distributed energy network as shown in Figure 2, the first microgrid is microgrid 2, and the second microgrid is microgrid 1.Microgrid 2 is connected with higher level's electrical network by points of common connection K4, and microgrid 1 is connected with higher level's electrical network by points of common connection K3, and microgrid 1 is connected with microgrid 2 by interconnection 3.Alternatively, detecting unit is the detecting unit of microgrid 2, certainly also can be the detecting unit in distributed energy network, preferably, select the detecting unit in microgrid 2, now can fast testing result be transferred in microgrid 2, carry out quick adjustment to make microgrid 2 pairs of distributed energy networks.
Particularly, the voltage and current of points of common connection is abnormal to be comprised: the three-phase voltage of points of common connection is reduced to below preset voltage value in the second Preset Time, and the voltage change ratio of three-phase voltage exceedes predeterminated voltage changing value, with, the electric current of points of common connection is reduced to below the first pre-set current value in the 3rd Preset Time.For example, the three-phase voltage of points of common connection K4 drops to less than 30% of rated voltage one second inwardly projecting, and the voltage change ratio of three-phase voltage exceedes 50% of rated voltage per second, and the electric current of points of common connection K4 drops to less than 30% of rated current one second inwardly projecting.Certainly above-mentioned second Preset Time, preset voltage value, predeterminated voltage changing value, the 3rd Preset Time and the first pre-set current value can be selected according to the actual requirements, and the present invention does not do concrete restriction to this.
Particularly, the exception of the voltage and current of the interconnection between the first microgrid and the second microgrid is detected for checking in the first microgrid side.For example, the abnormal of voltage and current of interconnection 3 checks at K switch 1 place of microgrid 2, due to the line between microgrid 2 and higher level's electrical network break down time, the exception of the voltage and current at K switch 1 place can be detected, thus the voltage and current declaration of exception K switch 1 at K switch 1 place is closed.
Step 302, detect that the voltage and current of points of common connection is abnormal when detecting unit, and when detecting that the voltage and current of interconnection is abnormal, through the time delay of the first Preset Time, interconnection is disconnected in the first microgrid side by the first microgrid.
For example, when detecting unit detects that the voltage and current of points of common connection K4 is abnormal, and when the K switch 1 determining between microgrid 2 and microgrid 1 closes, through the time delay of 100ms, K switch 1 disconnects by microgrid 2.
Certainly, the first Preset Time also can be other times, and those skilled in the art can select according to actual conditions, and interconnection disconnects and also completing by other modes by the first microgrid.
Step 303, the first microgrid send interconnection solution column information to distributed energy network of network dispatching patcher.
For example, microgrid 2 sends interconnection solution column information to distributed energy network of network dispatching patcher.Above-mentioned interconnection off-the-line information is indicated as and prevents load transfer plan, and microgrid 2 cuts off the connection between microgrid 2 and microgrid 1.Afterwards, distributed energy network of network dispatching patcher, through after a while, sends link information to make microgrid 2 Closing Switch K1 to microgrid 2 again.
As shown in Figure 4, when destruction source is rapid damage source, the control method of distributed energy network also comprises:
Step 401, detecting unit detect the exception of the voltage and current of interconnection between the first microgrid and the second microgrid.
For example, in distributed energy network as shown in Figure 2, the first microgrid is microgrid 2, and the second microgrid is microgrid 1.Alternatively, in this step, detecting unit is the detecting unit of microgrid 1, certainly also can be the detecting unit in distributed energy network, preferably, select the detecting unit in microgrid 1, now can fast testing result be transferred in microgrid 1, carry out quick adjustment to make microgrid 1 pair of distributed energy network.
Particularly, the exception of the voltage and current of the interconnection between the first microgrid and the second microgrid is detected for checking in the second microgrid side.For example, the exception of the voltage and current of interconnection is check at K switch 2 place of microgrid 1.
Particularly, between first microgrid and the second microgrid, the voltage and current of interconnection is abnormal comprises: the overcurrent of interconnection between the first microgrid and the second microgrid, or, the electric voltage over press of the interconnection between the first microgrid and the second microgrid, or, the under-voltage of interconnection between the first microgrid and the second microgrid.Particularly, between first microgrid and the second microgrid, the overcurrent of interconnection comprises: between the first microgrid and the second microgrid, the electric current of interconnection is more than the second pre-set current value, or, the electric current of the interconnection between the first microgrid and the second microgrid rises, and in the 5th Preset Time, the change of electric current is more than the 3rd pre-set current value.For example, between first microgrid and the second microgrid, the overcurrent of interconnection is: the electric current at K switch 2 place exceedes 80% of rated current, or, the electric current at K switch 2 place rises, within one second time, the change of electric current has exceeded 50% of rated current, certain second pre-set current value, the 5th Preset Time and the 3rd pre-set current value also can be other numerical value, and those skilled in the art can select according to actual conditions.The electric voltage over press of the interconnection between the first microgrid and the second microgrid is: the three-phase voltage at K switch 2 place exceedes 110% of rated voltage, can certainly exceed other magnitudes of voltage, and those skilled in the art can determine according to actual conditions.Between first microgrid and the second microgrid, the under-voltage of interconnection is: the three-phase voltage at K switch 2 place, can certainly lower than other magnitudes of voltage lower than 90% of rated voltage, and those skilled in the art can determine according to actual conditions.
Step 402, when detecting unit detects that the voltage and current of interconnection is abnormal, through the time delay of the 4th Preset Time, interconnection disconnects in the second microgrid side by the second microgrid.
Preferably, the scope of the 4th Preset Time is between 1 second to 10 seconds, and certain 4th Preset Time also can be other times, and those skilled in the art can select according to actual conditions.
For example, when detecting unit detects that the voltage and current at K switch 2 place is abnormal, through the time delay of 2 seconds, K switch 2 disconnected by microgrid 1.Certainly, interconnection disconnects and also completing by other modes by the second microgrid.
Step 403, the second microgrid send interconnection solution column information to distributed energy network of network dispatching patcher.
For example, microgrid 1 sends interconnection solution column information to distributed energy network of network dispatching patcher.Above-mentioned interconnection off-the-line information shows that interconnection disconnects by microgrid 1 because of interconnection overvoltage, overcurrent or under-voltage.Afterwards, distributed energy network of network dispatching patcher, through after a period of time, can send link information to make microgrid 1 Closing Switch K2 to microgrid 1 again.
When destruction source is rapid damage source, rapid damage source is independently detected by the first microgrid and the second microgrid, and independently disconnect the connecting line of the first microgrid and the second microgrid respectively fast, when the line can guaranteeing between the first microgrid and higher level's electrical network breaks down, the stability of the second microgrid can not be affected, thus make whole distributed energy network stabilization.
As shown in Figure 5, when the source of destruction is that when destroying at a slow speed source, the control method of distributed energy network also comprises:
Step 501, the trend of distributed energy network of network dispatching patcher to distributed energy network are analyzed.
Before this step, the detecting unit in microgrid by the generating active power belonging to same transformer station step-down transformer that detects and load active power transfer in distributed energy network of network dispatching patcher.For example, as shown in Figure 2, the generating active power that the Liang Tiao supply line belonging to transformer station's step-down transformer 4 detected records at points of common connection K3 and points of common connection K4 by the detecting unit in microgrid and load active power transfer are in distributed energy network of network dispatching patcher.
The network scheduling system of distributed energy carries out tidal current analysis to above-mentioned data.It should be noted that, circuit active power=generating active power-load active power.The method of tidal current analysis is: the circuit active power of points of common connection K4 and K3 of cumulative supply line, the cumulative generating active power of supply line points of common connection K4 and K3 and the load active power of cumulative supply line points of common connection K4 and K3.
Step 502, detecting unit are according to the analysis result of above-mentioned analysis, and whether detection distributed energy network exists trend is closed on oppositely.
Particularly, in this step, detecting unit is the detecting unit in distributed energy network, and it is according to above-mentioned power flow solutions, and whether detection exists trend is closed on oppositely.Whether namely cumulative in detecting step 502 circuit generated output is greater than 80% of cumulative load active power, if cumulative circuit generated output is greater than 80% of cumulative load active power, then close on oppositely for there is trend, certainly, whether detection exists trend is closed on oppositely whether also can be cumulative circuit generated output is greater than other numerical value, and the present invention does not do concrete restriction to this.
Step 503, when detecting unit detect distributed energy network exist trend close on reverse time, the dispatching patcher of distributed energy network selects the microgrid be associated, and sends the generated output upper limit to the microgrid that is associated.
For example, because microgrid 1 and microgrid 2 are connected with transformer station step-down transformer 4, thus microgrid 1 and the microgrid of microgrid 2 for being associated, when cumulative circuit generated output is greater than 80% of cumulative load active power, distributed energy network scheduling Systematic selection microgrid 1 and microgrid 2, the higher limit of generated output is sent, to reduce circuit generated output to microgrid 1 and microgrid 2.Wherein, the generated output upper limit can be 0 ,+50kW etc., and those skilled in the art can select according to actual conditions.
In step 504, the microgrid that is associated, at least one microgrid performs the generated output upper limit of above-mentioned transmission.
For example, microgrid 2 performs the higher limit of the generated output that distributed energy network of network dispatching patcher sends, and the trend existed to eliminate distributed energy network is closed on oppositely.
As shown in Figure 6, when the source of destruction is that when destroying at a slow speed source, the control method of distributed energy network also comprises:
Step 601, detecting unit detect distributed energy network and whether there is voltage deviation.
In this step, first, the detecting unit of microgrid detects the high side voltage of transformer in microgrid, and magnitude of voltage is sent to the detecting unit of distributed energy network.For example, with reference to the distributed energy network in figure 2, the detecting unit of microgrid 1 detects the voltage at the high side switch K3 place of the transformer of microgrid 1, the detecting unit of microgrid 2 detects the voltage at the high side switch K4 place of the transformer of microgrid 2, then above-mentioned magnitude of voltage is sent to the detecting unit of distributed energy network.
Then, whether the detecting unit calculating voltage of distributed energy network departs from.The computational methods of voltage deviation value are: the rated value of the measured value/high side voltage of voltage deviation value=high side voltage.Judge whether voltage departs from can be and judge that whether the voltage deviation value detected is higher than 105%, such as, if the voltage deviation value at K switch 3 place is higher than 105%, then depart from for too high; And can be and judge that whether the voltage deviation value that detects is lower than 95%, such as, if the voltage deviation value at K switch 3 place is lower than 95%, then depart from for too low.Certainly, what also can set other voltage deviation value departs from scope, and the present invention does not do concrete restriction to this.
Step 602, when detecting unit detects that distributed energy network exists voltage deviation, the dispatching patcher of distributed energy network selects the microgrid be associated, and sends reactive power desired value to the microgrid be associated.
For example, because microgrid 1 and microgrid 2 are connected with transformer station step-down transformer 4, thus microgrid 1 and the microgrid of microgrid 2 for being associated.When the voltage deviation at sense switch K3 place, the dispatching patcher of distributed energy network selects microgrid 1 and microgrid 2, sends reactive power desired value to microgrid 1 and microgrid 2.Wherein, reactive power desired value can be selected according to actual conditions, and magnitude of voltage can be made no longer to depart from.
In step 603, the microgrid that is associated, at least one microgrid performs reactive power compensation.
For example, microgrid 1 performs reactive power compensation, thus makes the voltage at K switch 3 place normal.
When the source of destruction is, when destroying at a slow speed source, regulated by distributed energy network of network dispatching patcher in conjunction with the subregion of microgrid to distributed energy network, uncontrollable electric grade can be reduced and destroy at a slow speed source to the impact of the stability of distributed energy.
The control method of the distributed energy network that the embodiment of the present invention two provides, detect the destruction source of distributed energy network stabilization at detecting unit after, because microgrid has responding ability fast, thus can regulate distributed energy network fast, to eliminate the unexpected power-off of microgrid side supply line to the impact of distributed energy network; And because distributed energy network of network dispatching patcher associating microgrid can regulate distributed energy network regional area, thus can reduce electrically to put the impact of change at random on distributed energy network, thus ensure the stability of distributed energy network.
Embodiment three
As shown in Figure 7, embodiments provide a kind of adjusting device 70 of distributed energy network, this device 70 comprises: detecting unit 701, for detecting the destruction source of distributed energy network stabilization; Distributed energy network of network dispatching patcher 702, after destruction source being detected, regulates distributed energy network for detecting unit 701; Microgrid 703, after destruction source being detected, regulates distributed energy network for detecting unit 701.
Wherein, destruction source comprises: rapid damage source, and rapid damage source comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold; Now, above-mentioned microgrid 703 for, when detecting unit 701 detects rapid damage source, distributed energy network is regulated; Destroy source at a slow speed, source of destroying at a slow speed comprises the destruction source that formation time is greater than the second time threshold; Now, distributed energy network of network dispatching patcher 702 for, when detect at a slow speed destroy source time, distributed energy network is regulated; Microgrid 703 also for, after distributed energy network of network dispatching patcher 702 pairs of distributed energy networks regulate, distributed energy network is regulated.
Particularly, microgrid 703 specifically for, when detecting unit 701 detects rapid damage source, carry out the operation of interconnection off-the-line, and send interconnection solution column information to distributed energy network of network dispatching patcher 702.
Particularly, microgrid 703 comprises the first microgrid and the second microgrid, when destruction source is rapid damage source, detecting unit 701 for, detect the exception of voltage and current of points of common connection, and detect the exception of voltage and current of the interconnection between the first microgrid and the second microgrid; First microgrid specifically for, when detecting unit 701 detects that the voltage and current of points of common connection is abnormal, and when detecting that the voltage and current of interconnection is abnormal, through the time delay of the first Preset Time, in the first microgrid side, interconnection is disconnected, and send interconnection solution column information to distributed energy network of network dispatching patcher 702.
Particularly, when the destruction source detected is rapid damage source, detecting unit 701 also for, detect the exception of the voltage and current of interconnection between the first microgrid and the second microgrid; Second microgrid is used for, and when detecting that the voltage and current of interconnection is abnormal, through the time delay of the 4th Preset Time, being disconnected by interconnection in the second microgrid side, and sending interconnection solution column information to distributed energy network of network dispatching patcher 702.
Particularly, when the source of destruction is when destroying at a slow speed source, distributed energy network of network dispatching patcher 702 for, when detecting unit 701 detect at a slow speed destroy source time, distributed energy network of network dispatching patcher 702 selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power to the microgrid be associated; The microgrid be associated for, perform the operational factor of active power and the operational factor of reactive power that distributed energy network of network dispatching patcher 702 sends.
Particularly, detect the destruction source of distributed energy network stabilization at detecting unit before, device 70 also comprises: distributed energy network of network dispatching patcher 702 pairs of distributed energy networks carry out tidal current analysis; Detecting unit 701 for, according to the analysis result analyzed, detect distributed energy network and whether there is trend and closes on oppositely; Then distributed energy network of network dispatching patcher 702 for, when detecting unit 701 detect distributed energy network exist trend close on reverse time, distributed energy network of network dispatching patcher 702 selects the microgrid be associated, and sends the generated output upper limit to the microgrid be associated; In the microgrid be associated at least one microgrid for, perform the generated output upper limit.
Particularly, detecting unit also 701 for, detect distributed energy network and whether there is voltage deviation; Distributed energy network of network dispatching patcher 702 also for, if distributed energy network exists voltage deviation, then distributed energy network of network dispatching patcher 702 selects the microgrid that is associated, sends reactive power desired value to the microgrid be associated; In the microgrid be associated at least one microgrid for, perform reactive power compensation.
Concrete control method, the principle of the adjusting device of above-mentioned distributed energy network are identical with embodiment two with above-described embodiment one with the course of work, do not repeat them here.
The adjusting device of the distributed energy network that the embodiment of the present invention three provides, detect the destruction source of distributed energy network stabilization at detecting unit after, because microgrid has responding ability fast, thus can regulate distributed energy network fast, to eliminate the unexpected power-off of microgrid side supply line to the impact of distributed energy network; And because distributed energy network of network dispatching patcher associating microgrid can regulate distributed energy network regional area, thus can reduce electrically to put the impact of change at random on distributed energy network, thus ensure the stability of distributed energy network.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the part with other embodiments.Especially, for device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.
It should be noted that, device embodiment described above is only schematic, the unit wherein illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.In addition, in device embodiment accompanying drawing provided by the invention, the annexation between module represents to have communication connection between them, specifically can be implemented as one or more communication bus or holding wire.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily 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 the protection range of described claim.
Claims (19)
1. a control method for distributed energy network, is characterized in that, comprising:
Detecting unit detects the destruction source of described distributed energy network stabilization;
When described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher regulate described distributed energy network.
2. method according to claim 1, is characterized in that, described destruction source comprises:
Rapid damage source, described rapid damage source comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold; With
Destroy source at a slow speed, the described source of destruction at a slow speed comprises the destruction source that formation time is greater than described second time threshold.
3. method according to claim 2, it is characterized in that, when described destruction source is rapid damage source, described when described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher regulate described distributed energy network and specifically comprise:
When described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line, and described interconnection is between adjacent two described microgrids;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
4. method according to claim 3, is characterized in that, the destruction source that described detecting unit detects described distributed energy network stabilization comprises:
Detecting unit detects the exception of voltage and current of points of common connection, and the exception of the voltage and current of interconnection between the first microgrid and the second microgrid;
Then described when described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line and specifically comprises:
When described detecting unit detects that the voltage and current of described points of common connection is abnormal, and when detecting that the voltage and current of described interconnection is abnormal, through the time delay of the first Preset Time, described interconnection disconnects in described first microgrid side by described first microgrid;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher and specifically comprises:
Described first microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
5. method according to claim 4, is characterized in that, the voltage and current of described points of common connection is abnormal specifically to be comprised:
The three-phase voltage of points of common connection is reduced to below preset voltage value in the second Preset Time, and the voltage change ratio of described three-phase voltage exceedes predeterminated voltage changing value; With
The electric current of points of common connection is reduced to below the first pre-set current value in the 3rd Preset Time.
6. method according to claim 4, is characterized in that, the destruction source that described detecting unit detects described distributed energy network stabilization also comprises:
Detecting unit detects the exception of the voltage and current of interconnection between the first microgrid and the second microgrid;
Then described when described detecting unit detects described rapid damage source, microgrid carries out the operation of interconnection off-the-line and specifically comprises:
When described detecting unit detects that the voltage and current of described interconnection is abnormal, through the time delay of the 4th Preset Time, described interconnection disconnects in described second microgrid side by the second microgrid;
Described microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher and specifically comprises:
Described second microgrid sends interconnection solution column information to described distributed energy network of network dispatching patcher.
7. the method according to claim 4 or 6, is characterized in that, between described first microgrid and the second microgrid, the exception of the voltage and current of interconnection comprises:
The overcurrent of interconnection between first microgrid and the second microgrid;
The electric voltage over press of interconnection between first microgrid and the second microgrid; Or
The under-voltage of interconnection between first microgrid and the second microgrid.
8. method according to claim 7, is characterized in that, between described first microgrid and the second microgrid, the overcurrent of interconnection specifically comprises:
The electric current of the interconnection between the first microgrid and the second microgrid is more than the second pre-set current value; Or
The electric current of the interconnection between the first microgrid and the second microgrid rises, and in the 5th Preset Time, the change of described electric current is more than the 3rd pre-set current value.
9. method according to claim 2, it is characterized in that, when described destruction source is the described source of destruction at a slow speed, described when described detecting unit detects described destruction source, microgrid and described distributed energy network of network dispatching patcher regulate described distributed energy network and specifically comprise:
When destroying at a slow speed source described in described detecting unit detects, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power to the described microgrid be associated;
Microgrid performs the operational factor of described active power and the operational factor of reactive power.
10. method according to claim 9, is characterized in that, before detecting the destruction source of described distributed energy network stabilization, also comprises at described detecting unit:
Distributed energy network of network dispatching patcher carries out tidal current analysis to described distributed energy network;
The destruction source that then described detecting unit detects described distributed energy network stabilization specifically comprises:
Detecting unit, according to the analysis result of described tidal current analysis, detects described distributed energy network and whether there is trend and close on oppositely;
Described when destroying at a slow speed source described in described detecting unit detects, distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the operational factor of active power and the operational factor of reactive power is specially to the described microgrid that is associated:
When described detecting unit detect described distributed energy network exist trend close on reverse time, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the generated output upper limit to the described microgrid that is associated;
The operational factor of operational factor and reactive power that described microgrid performs the active power of described transmission is specially:
In the described microgrid be associated, at least one microgrid performs the described generated output upper limit.
11. methods according to claim 9, is characterized in that, the destruction source that described detecting unit detects distributed energy network stabilization also comprises:
Detecting unit detects described distributed energy network and whether there is voltage deviation;
Then described when destroying at a slow speed source described in described detecting unit detects, described distributed energy network of network dispatching patcher selects the microgrid be associated, and is specially to the described microgrid transmission active power operational factor that is associated and reactive power operation parameter:
When described detecting unit detects that described distributed energy network exists described voltage deviation, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends reactive power desired value to the described microgrid be associated;
The operational factor of operational factor and reactive power that described microgrid performs described active power specifically comprises:
In the described microgrid be associated, at least one microgrid performs reactive power compensation.
The adjusting device of 12. 1 kinds of distributed energy networks, is characterized in that, described device comprises:
Detecting unit, for detecting the destruction source of described distributed energy network stabilization;
Distributed energy network of network dispatching patcher, after described destruction source being detected, regulates described distributed energy network for described detecting unit;
Microgrid, after described destruction source being detected, regulates described distributed energy network for described detecting unit.
13. devices according to claim 12, is characterized in that, described destruction source comprises:
Rapid damage source, described rapid damage source comprises formation time and is greater than very first time threshold value and the destruction source being less than or equal to the second time threshold;
Described microgrid is used for, and when described detecting unit detects described rapid damage source, regulates described distributed energy network;
With
Destroy source at a slow speed, the described source of destruction at a slow speed comprises the destruction source that formation time is greater than the second time threshold;
Described distributed energy network of network dispatching patcher is used for, and when destroying at a slow speed source described in described detecting unit detects, regulates described distributed energy network;
Described microgrid also for, after described distributed energy network of network dispatching patcher regulates described distributed energy network, described distributed energy network is regulated.
14. devices according to claim 13, is characterized in that, when described destruction source is described rapid damage source, described microgrid specifically for,
When described detecting unit detects described rapid damage source, carry out the operation of interconnection off-the-line, described interconnection is between adjacent two described microgrids;
Interconnection solution column information is sent to described distributed energy network of network dispatching patcher.
15. devices according to claim 14, is characterized in that, described microgrid comprises the first microgrid and the second microgrid, when described destruction source is described rapid damage source, described detecting unit specifically for,
Detect the exception of voltage and current of points of common connection, and detect the exception of voltage and current of the interconnection between the first microgrid and the second microgrid;
Described first microgrid specifically for,
When described detecting unit detects that the voltage and current of described points of common connection is abnormal, and when detecting that the voltage and current of described interconnection is abnormal, through the time delay of the first Preset Time, in described first microgrid side, described interconnection is disconnected;
Interconnection solution column information is sent to distributed energy network of network dispatching patcher.
16. devices according to claim 15, is characterized in that, when the described destruction source detected is described rapid damage source, described detecting unit also for,
Detect the exception of the voltage and current of the interconnection between the first microgrid and the second microgrid;
Described second microgrid specifically for,
When described detecting unit detects that the voltage and current of described interconnection is abnormal, through the time delay of the 4th Preset Time, in described second microgrid side, described interconnection is disconnected;
Interconnection solution column information is sent to distributed energy network of network dispatching patcher.
17. devices according to claim 13, is characterized in that, when described destruction source be described at a slow speed destroy source time, described distributed energy network of network dispatching patcher specifically for,
When destroying at a slow speed source described in described detecting unit detects, select the microgrid be associated, and send the operational factor of active power and the operational factor of reactive power to the described microgrid be associated;
The described microgrid be associated specifically for, perform described distributed energy network of network dispatching patcher send the operational factor of active power and the operational factor of reactive power.
18. devices according to claim 17, is characterized in that, before detecting the destruction source of described distributed energy network stabilization, also comprise at described detecting unit:
Described distributed energy network of network dispatching patcher carries out tidal current analysis to described distributed energy network;
Described detecting unit specifically for, according to the analysis result of described tidal current analysis, detect described distributed energy network and whether there is trend and close on oppositely;
Then described distributed energy network of network dispatching patcher specifically for, when described detecting unit detect described distributed energy network exist trend close on reverse time, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends the generated output upper limit to the described microgrid be associated;
In the described microgrid be associated at least one microgrid for, perform the described generated output upper limit.
19. devices according to claim 18, is characterized in that, described detecting unit also for, detect described distributed energy network and whether there is voltage deviation;
Described distributed energy network of network dispatching patcher also for, when described detecting unit detects that described distributed energy network exists described voltage deviation, described distributed energy network of network dispatching patcher selects the microgrid be associated, and sends reactive power desired value to the described microgrid be associated;
In the described microgrid be associated at least one microgrid for, perform reactive power compensation.
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