CN109473988B - Method and device for controlling power flow and processing fault of intelligent power distribution network containing micro-grid - Google Patents
Method and device for controlling power flow and processing fault of intelligent power distribution network containing micro-grid Download PDFInfo
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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
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Abstract
The invention relates to a method and a device for controlling the power flow and processing faults of an intelligent power distribution network comprising a micro-grid, wherein the control method comprises the following steps: acquiring the output power of each distributed power supply and the tide direction of each microgrid in real time; if the tide of a certain micro-grid flows to the power distribution network, the load of the power distribution network is switched to the micro-grid under the condition that the output power of all distributed power supplies is not changed until the tide direction of the micro-grid is changed. The control device is used for realizing the control method. The fault processing method comprises the following steps: when a fault occurs at a certain part of a power distribution network outside the microgrid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the microgrid, the microgrid is directly cut off, and the fault is processed according to a microgrid isolated island operation fault processing method. The fault processing device is used for realizing the fault processing method. The method ensures the stability of the power flow direction of the power distribution network system and reduces the difficulty in fault treatment of the power distribution network system.
Description
Technical Field
The invention belongs to the technical field of power distribution networks, and particularly relates to a method and a device for controlling the power flow and processing faults of an intelligent power distribution network with a micro-grid.
Background
With research and application of information technology and intelligent technology in a power Distribution network, the power Distribution network is accelerating to develop towards the direction of intelligence, and a typical characteristic of the intelligent power Distribution network is that a large amount of Distributed Generation (DG) accesses are supported, the distributed power can be scheduled to participate in system optimization operation by using the intelligent technology, ordered power utilization of power users is adjusted, source-network-load coordination optimization management is realized, and the reliability of the overall operation of the power Distribution network system is improved.
At present, a power distribution network is generally designed as a radiation network, a user side does not have any power supply, and according to the change of trend directions before and after a fault, different faults of a power distribution network system can be easily solved by a traditional relay protection configuration scheme. However, due to the large-scale development and utilization of renewable energy, the penetration rate of distributed power supply access in the intelligent power distribution network is continuously improved, the power distribution network has a plurality of power supply nodes due to the access of high-penetration distributed power supply, and the output power of the distributed power supply is random and variable, so that the output power of the distributed power supply can be changed alternately in the power distribution network, the trend direction of the power distribution network system fluctuates randomly, the difficulty in fault treatment of the power distribution network system is increased, and negative effects are brought to the reliable operation of the intelligent power distribution network. Because the direction and the size of a line tide are changed by accessing a high-permeability distributed power supply into a power distribution network, the method depends on the access position of the distributed power supply, the relative size of the power load, the capacity of a power supply, the topological structure of the network and other factors, so that the method ensures that the tide direction of the intelligent power distribution network is not influenced by the access of the distributed power supply by utilizing the advantageous technology of the intelligent power distribution network under the condition of not reducing the output power of the distributed power supply as much as possible and effectively processing the faults of the power distribution network system, shortens the fault power failure time of the power distribution network system, becomes the problem to be solved urgently at present, and the solution of the problem has very.
Disclosure of Invention
The invention provides a method and a device for controlling the power flow of an intelligent power distribution network with a micro-grid, which aim to solve the problem that the power flow direction of the power distribution network system is easy to fluctuate randomly due to the access of a distributed power supply in the conventional intelligent power distribution network. The invention also provides a fault processing method and device for the intelligent power distribution network comprising the micro-grid, and aims to solve the problem that the current direction of the power distribution network system is easy to fluctuate randomly due to the access of the distributed power supply in the existing intelligent power distribution network, so that the fault processing difficulty of the power distribution network system is high.
In order to solve the problem that the power flow direction of a power distribution network system is easy to fluctuate randomly due to the access of distributed power supplies in the existing intelligent power distribution network, the power flow control method of the intelligent power distribution network containing the micro-grid comprises the following steps:
1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time;
2) if the tide of one micro-grid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, the load on the power distribution network is switched to the micro-grid until the tide direction of a node of the micro-grid, which is accessed to the power distribution network, is changed.
The intelligent power distribution network power flow control method containing the micro-grid has the beneficial effects that: according to the method, the distribution network operation information is analyzed in real time, and the load distribution of the distribution network system and the output power of the distributed power supply are coordinated, so that the problem that the power flow direction of the distribution network system is easy to fluctuate randomly can be solved, the maximum utilization of the distributed power supply can be realized, and the energy utilization efficiency is improved. The method can ensure that the micro-grid containing the distributed power supply is always connected to the power distribution network in a load mode, so that for the power distribution network adopting the method, the related faults can be processed by utilizing a traditional relay protection configuration scheme under the condition of the fault of the intelligent power distribution network, and the difficulty in processing the fault of the intelligent power distribution network containing the distributed power supply is reduced.
In order to keep the loads of the micro-grids balanced and coordinated, if the situation that the tide of one micro-grid flows to the power distribution network and a part of the load originally belonging to the micro-grid is transferred to other micro-grids is judged, the load originally belonging to the micro-grid is preferentially switched from other micro-grids under the condition that the tide direction of other micro-grids connected to the power distribution network is unchanged, and then the load on the power distribution network is switched.
In order to further ensure that the adjustment of the tidal current direction is realized and the maximum utilization of the distributed power supply can be realized, if the tidal current direction of a micro-grid still cannot be changed by transferring the load on a bus of the power distribution network to a certain micro-grid, the loads in other micro-grids are continuously switched to the micro-grid under the condition that the output power of the distributed power supply in other micro-grids is not changed and the tidal current directions of nodes of other micro-grids connected to the power distribution network are not changed until the tidal current directions of the nodes of the micro-grid connected to the power distribution network are changed.
In order to ensure that the micro-grid containing the distributed power supplies is always connected to the power distribution network in a load mode, if the tidal current direction of a certain micro-grid connected to the power distribution network cannot be changed by transferring the loads on buses of other micro-grids, the output power of the distributed power supplies in the micro-grid is reduced until the tidal current direction of nodes of the micro-grid connected to the power distribution network is changed.
In order to solve the problem that the power flow direction of a power distribution network system is easy to fluctuate randomly due to the access of distributed power supplies in the existing intelligent power distribution network, the power flow control device of the intelligent power distribution network containing the micro-grid is used for realizing the following functions: 1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time; 2) if the tide of one micro-grid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, the load on the power distribution network is switched to the micro-grid until the tide direction of a node of the micro-grid, which is accessed to the power distribution network, is changed.
The intelligent power distribution network power flow control device containing the micro-grid has the beneficial effects that: according to the method, the distribution network operation information is analyzed in real time, and the load distribution of the distribution network system and the output power of the distributed power supply are coordinated, so that the problem that the power flow direction of the distribution network system is easy to fluctuate randomly can be solved, the maximum utilization of the distributed power supply can be realized, and the energy utilization efficiency is improved. The device can ensure that the micro-grid containing the distributed power supply is always connected to the power distribution network in a load mode, so that for the power distribution network adopting the device, the related faults can be processed by utilizing a traditional relay protection configuration scheme under the condition of the fault of the intelligent power distribution network, and the difficulty in processing the fault of the intelligent power distribution network containing the distributed power supply is reduced.
In order to balance and coordinate loads of the micro-grids, the control device is further used for realizing the following functions: if the situation that the tide of a certain micro-grid flows to the power distribution network and a part of loads originally belonging to the micro-grid are transferred to other micro-grids is judged, the loads originally belonging to the micro-grid are preferentially switched from other micro-grids under the condition that the tide directions of other micro-grids connected to the power distribution network are not changed, and then the loads on the power distribution network are switched.
In order to further ensure that the maximum utilization of the distributed power supply can be realized while the power flow direction is adjusted, the control device is also used for realizing the following functions: if the load on the bus of the power distribution network is transferred to a certain microgrid, the tidal current direction of the microgrid still cannot be changed, and the loads in other microgrids are continuously switched to the microgrid under the conditions that the output power of distributed power supplies in other microgrids is not changed and the tidal current direction of nodes of other microgrids connected to the power distribution network is not changed until the tidal current direction of the nodes of the microgrid connected to the power distribution network is changed.
In order to ensure that the micro-grid with distributed power supplies is always connected to the power distribution network in the form of load, the control device is further used for realizing the following functions: if the tidal current direction of a certain microgrid accessing a power distribution network cannot be changed by transferring loads on buses of other microgrids, the output power of a distributed power supply in the microgrid is reduced until the tidal current direction of a node of the microgrid accessing the power distribution network is changed.
In order to solve the problem that the current direction of the power distribution network system is easy to fluctuate randomly due to the access of distributed power supplies of the existing intelligent power distribution network, and further the fault processing difficulty of the power distribution network system is high, the fault processing method of the intelligent power distribution network containing the micro-grid comprises the following steps: when a fault occurs at a certain part of a power distribution network system outside a micro-grid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the micro-grid, the micro-grid is directly cut off, and the fault is processed according to a micro-grid island operation fault processing method. The method is used for the intelligent power distribution network adopting the intelligent power distribution network power flow control method containing the micro-grid, and the intelligent power distribution network power flow control method containing the micro-grid comprises the following steps:
1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time;
2) if the tide of one micro-grid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, the load on the power distribution network is switched to the micro-grid until the tide direction of a node of the micro-grid, which is accessed to the power distribution network, is changed.
The intelligent power distribution network fault processing method containing the micro-grid has the beneficial effects that: according to the method, the operation information of the power distribution network is analyzed in real time, and the load distribution of the power distribution network system and the output power of the distributed power supply are coordinated, so that on one hand, a micro-grid containing the distributed power supply can be ensured to be always connected to the power distribution network in a load mode, related faults can be processed by using a traditional relay protection configuration scheme under the condition of a fault of the intelligent power distribution network, and the difficulty in fault processing of the intelligent power distribution network containing the distributed power supply is reduced; on the other hand, under the condition of effectively processing the faults of the intelligent power distribution network system, the maximum utilization of the distributed power supply can be realized, and the energy utilization efficiency is improved.
In order to keep the loads of all micro-grids balanced and coordinated, when the intelligent power distribution network to which the fault processing method is applied carries out power flow control, if the situation that the power flow of a certain micro-grid flows to the power distribution network and a part of the loads originally belonging to the micro-grid are transferred to other micro-grids is judged, the loads originally belonging to the micro-grid are preferentially switched from other micro-grids under the condition that the power flow direction of other micro-grids connected to the power distribution network is not changed, and then the loads on the power distribution network are switched.
In order to further ensure that not only can the adjustment of the power flow direction be realized, but also the maximum utilization of the distributed power supply can be realized, when the intelligent power distribution network applied to the fault processing method carries out power flow control, if the load on a power distribution network bus is transferred to a certain micro power grid, the power flow direction of the micro power grid still cannot be changed, and under the condition that the output power of the distributed power supply in all other micro power grids is not changed and the power flow directions of all other micro power grid access power distribution network nodes are not changed, the loads in other micro power grids are continuously switched to the micro power grid until the power flow directions of the micro power grid access power distribution network nodes are changed.
In order to ensure that a micro-grid containing distributed power supplies is always connected to a power distribution network in a load mode, when the intelligent power distribution network applied to the fault processing method is used for carrying out power flow control, if the power flow direction of a certain micro-grid connected to the power distribution network can not be changed by transferring loads on buses of other micro-grids, the output power of the distributed power supplies in the micro-grid is reduced until the power flow direction of nodes of the micro-grid connected to the power distribution network is changed.
In order to solve the problem that the current direction of the power distribution network system is easy to fluctuate randomly due to the access of distributed power supplies of the existing intelligent power distribution network, and further the fault processing difficulty of the power distribution network system is high, the fault processing device of the intelligent power distribution network containing the micro-grid is used for realizing the following fault processing functions: when a fault occurs at a certain part of a power distribution network system outside a micro-grid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the micro-grid, the micro-grid is directly cut off, and the fault is processed according to a micro-grid island operation fault processing method. The fault processing device is used for the intelligent power distribution network adopting the intelligent power distribution network power flow control method comprising the micro-grid, and the intelligent power distribution network power flow control method comprising the following steps:
1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time;
2) if the tide of one micro-grid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, the load on the power distribution network is switched to the micro-grid until the tide direction of a node of the micro-grid, which is accessed to the power distribution network, is changed.
The intelligent power distribution network fault processing device containing the micro-grid has the beneficial effects that: according to the method, the operation information of the power distribution network is analyzed in real time, and the load distribution of the power distribution network system and the output power of the distributed power supply are coordinated, so that on one hand, a micro-grid containing the distributed power supply can be ensured to be always connected to the power distribution network in a load mode, related faults can be processed by using a traditional relay protection configuration scheme under the condition of a fault of the intelligent power distribution network, and the difficulty in fault processing of the intelligent power distribution network containing the distributed power supply is reduced; on the other hand, under the condition of effectively processing the faults of the intelligent power distribution network system, the maximum utilization of the distributed power supply can be realized, and the energy utilization efficiency is improved.
In order to keep the loads of the micro-grids balanced and coordinated, when the intelligent power distribution network to which the fault processing device is applied carries out power flow control, if the situation that the power flow of a certain micro-grid flows to the power distribution network and a part of the loads originally belonging to the micro-grid are transferred to other micro-grids is judged, the loads originally belonging to the micro-grid are preferentially switched from other micro-grids under the condition that the power flow direction of the other micro-grids connected to the power distribution network is not changed, and then the loads on the power distribution network are switched.
In order to further ensure that not only can the adjustment of the power flow direction be realized, but also the maximum utilization of the distributed power supply can be realized, when the intelligent power distribution network applicable to the fault processing device carries out power flow control, if the load on a power distribution network bus is transferred to a certain micro power grid, the power flow direction of the micro power grid still cannot be changed, and under the condition that the output power of the distributed power supply in all other micro power grids is not changed and the power flow directions of all other micro power grid access power distribution network nodes are not changed, the loads in other micro power grids are continuously switched to the micro power grid until the power flow directions of the micro power grid access power distribution network nodes are changed.
In order to ensure that a microgrid with distributed power supplies is always connected to a power distribution network in a load mode, when a smart power distribution network applied to the fault processing device performs power flow control, if the power flow direction of a certain microgrid connected to the power distribution network cannot be changed by transferring loads on buses of other microgrids, the output power of the distributed power supplies in the microgrid is reduced until the power flow direction of nodes of the microgrid connected to the power distribution network is changed.
Drawings
FIG. 1 is a schematic diagram of an intelligent power distribution network system architecture of the present invention;
FIG. 2 is a schematic diagram of a bus load transfer connection of the intelligent power distribution network;
FIG. 3 is a schematic diagram of a bus load transfer process of the intelligent power distribution network based on a power flow direction;
FIG. 4 is a schematic diagram of a load coordination transfer connection between the smart distribution grid and the microgrid according to the present invention;
fig. 5 is a schematic diagram of a load coordination transfer process of the intelligent power distribution network and the micro-grid based on the power flow direction.
Detailed Description
The technical scheme of the invention is further explained in detail with reference to the attached drawings.
The embodiment of the intelligent power distribution network power flow control method containing the micro-grid comprises the following steps:
the control method of the invention comprises the following steps:
1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time;
2) if the tide of one micro-grid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, the load on the power distribution network is switched to the micro-grid until the tide direction of a node of the micro-grid, which is accessed to the power distribution network, is changed.
The micro-grid connected to the power distribution network can be one or more micro-grids which are simultaneously changed in the direction of the power flow at the node connected to the power distribution network, and the control method can be adopted to control the direction of the power flow when the power flows of a plurality of micro-grids flow to the power distribution network.
In order to keep the loads of the micro-grids balanced and coordinated, if the situation that the tide of one micro-grid flows to the power distribution network and a part of the load originally belonging to the micro-grid is transferred to other micro-grids is judged, the load originally belonging to the micro-grid is preferentially switched from other micro-grids under the condition that the tide direction of other micro-grids connected to the power distribution network is unchanged, and then the load on the power distribution network is switched.
In order to further ensure that the adjustment of the tidal current direction is realized and the maximum utilization of the distributed power supply can be realized, if the tidal current direction of a micro-grid still cannot be changed by transferring the load on a bus of the power distribution network to a certain micro-grid, the loads in other micro-grids are continuously switched to the micro-grid under the condition that the output power of the distributed power supply in other micro-grids is not changed and the tidal current directions of nodes of other micro-grids connected to the power distribution network are not changed until the tidal current directions of the nodes of the micro-grid connected to the power distribution network are changed.
In order to ensure that the micro-grid containing the distributed power supplies is always connected to the power distribution network in a load mode, if the tidal current direction of a certain micro-grid connected to the power distribution network cannot be changed by transferring the loads on buses of other micro-grids, the output power of the distributed power supplies in the micro-grid is reduced until the tidal current direction of nodes of the micro-grid connected to the power distribution network is changed. When the output power of a distributed power supply in a micro-grid with a power flow flowing to a power distribution network needs to be reduced, a power distribution network bus load and other micro-grid loads switched to the micro-grid are still connected to the micro-grid.
The embodiment of the intelligent power distribution network power flow control device comprising the micro-grid comprises the following steps:
the micro-grid-containing intelligent power distribution network power flow control device is used for realizing the micro-grid-containing intelligent power distribution network power flow control method, and the specific content of the micro-grid-containing intelligent power distribution network power flow control method is shown in the embodiment of the micro-grid-containing intelligent power distribution network power flow control method, and is not explained in detail here. The control device in this embodiment is generally a distribution network master station system.
The embodiment of the fault processing method of the intelligent power distribution network containing the micro-grid comprises the following steps:
the fault processing method of the intelligent power distribution network comprising the micro-grid comprises the steps of processing a fault according to a traditional power distribution network relay protection configuration method when a certain part of a power distribution network system except the micro-grid fails, directly cutting off the micro-grid if a fault occurs inside the micro-grid, and processing the fault according to a micro-grid island operation fault processing method. The fault processing method is suitable for the intelligent power distribution network with the micro-grid comprising the distributed power supplies always connected to the power distribution network in a load mode, and in order to achieve the effect that the micro-grid comprising the distributed power supplies always connected to the power distribution network in the load mode, the power distribution network adopts a power flow control method to control the power flow direction of the power distribution network system to be stable. After the micro-grid isolated island with the fault is operated and the fault is processed, the power distribution network system is still connected to realize grid-connected operation.
When the primary side current of a protected line reaches a certain setting value, the three-stage current protection such as instantaneous current quick-break protection, timing current quick-break protection, overcurrent protection and the like of a protection device arranged at the position can be utilized to be matched with each other, and under the condition of ensuring enough sensitivity, the aims of instantaneously removing faults and protecting the full length of the line are fulfilled; or the inverse time limit overcurrent protection with shorter protection action time limit is adopted when the short-circuit current is larger, so that the related circuit is protected rapidly and selectively. The microgrid island operation fault processing method adopts the prior art such as a two-section protection scheme combining overcurrent protection and negative sequence overcurrent protection, a protection scheme using three-phase current and zero-sequence current as fault criteria to realize microgrid island operation, and the like, and the specific implementation process is the prior art and is not elaborated herein.
The invention discloses an embodiment of a fault processing device for an intelligent power distribution network with a micro-grid, which comprises the following steps:
the intelligent power distribution network fault processing device containing the micro-grid is used for realizing the following fault processing functions: when a fault occurs at a certain part of a power distribution network system outside a micro-grid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the micro-grid, the micro-grid is directly cut off, and the fault is processed according to a micro-grid island operation fault processing method. The fault processing device is suitable for a smart distribution network with a micro-grid containing distributed power supplies always connected to the distribution network in a load mode, and in order to realize that the micro-grid containing the distributed power supplies always connected to the distribution network in the load mode, the smart distribution network adopts a power flow control method to control the power flow direction of a distribution network system to be stable. After the micro-grid isolated island with the fault is operated and the fault is processed, the power distribution network system is still connected to realize grid-connected operation.
The traditional power distribution network relay protection configuration method and the micro-grid isolated island operation fault processing method are described in the micro-grid-included intelligent power distribution network fault processing method embodiment, and detailed description is omitted here.
The above embodiments are described in further detail below.
Fig. 1 shows an architecture of an intelligent power distribution network system, where the intelligent power distribution network includes a distribution network main station system, a distribution network power supply, a distribution network bus load feeder line L0i (i ═ 1, 2, …, p), a Micro-Grid (MG) MG1 composed of a distributed power supply DG1 and a load feeder line L1j (j ═ 1, 2, …, n), a Micro-Grid (MG) MG2 composed of a distributed power supply DG2 and a load feeder line L2k (k ═ 1, 2, …, m), and an associated circuit breaker.
The power distribution network master station system receives the operation information of the intelligent power distribution network and analyzes the output power of the distributed power supply DG1 and the distributed power supply DG2, and the power flow directions of the nodes 1 and 2 of the power distribution network where the micro-grid MG1 and the micro-grid MG2 are connected in real time; if the micro-grid MG1 (micro-grid MG2) outputs power to the power distribution network, sequentially switching loads L0i (i is 1, 2, …, p) on a bus of the power distribution network to a micro-grid MG1 (micro-grid MG2) under the condition that the output power of the distributed power supply DG1 and the output power of the distributed power supply DG2 are not changed, and enabling the power flow at the position where the micro-grid MG1 (micro-grid MG2) is connected to a node 1 (node 2) of the power distribution network to flow to the micro-grid MG1 (micro-grid MG2) from the power distribution network, wherein if the power distribution networks except the micro-grid MG1 and the micro-grid MG2 have faults, the faults are processed according to a traditional; if faults occur in the micro-grid MG1 or the micro-grid MG2, the micro-grid is cut off, related faults are processed according to a micro-grid isolated island operation fault processing method, and after the micro-grid faults in isolated island operation are processed, the micro-grid system is still connected to the intelligent power distribution network system to realize grid-connected operation; the bus load transfer and processing flow is shown in fig. 2 and 3. In fig. 2, QF01 … QF0p and QF01 '… QF0 p' are circuit breakers, and are used for switching the load of a distribution network bus on the distribution network bus, a micro-grid MG1 and a micro-grid MG2 bus.
In the adjusting process, if the load transfer of the distribution network bus cannot realize that the power flow of the micro-grid MG1 (micro-grid MG2) connected to the distribution network node 1 (node 2) flows from the distribution network to the micro-grid MG1 (micro-grid MG2), the power flow continues to flow from the distribution network to the micro-grid MG1 (micro-grid MG2) through sequentially transferring the load L2k (k is 1, 2, …, m) (L1j (j is 1, 2, …, n)) in the micro-grid MG2 (micro-grid MG1) until the power flow of the micro-grid MG1 (micro-grid MG2) connected to the distribution network node 1 (node 2) flows from the distribution network to the micro-grid MG1 (MG 2); if the load of a distribution network bus and the load of the microgrid MG2 (microgrid MG1) cannot realize that the tide of the microgrid MG1 (microgrid MG2) accessing to the node 1 (node 2) of the distribution network flows to the microgrid MG1 (microgrid MG2) from the distribution network, the output power of the distributed power supply DG1 (distributed power supply DG2) is further reduced to realize that the tide of the node 1 (node 2) flows to the microgrid MG1 (microgrid MG2) from the distribution network; fig. 4 and 5 show the load transfer and processing flows, wherein QF11 … QF1n and QF21 … QF2n in fig. 4 all represent circuit breakers, and are used for switching microgrid MG1 bus loads and microgrid MG2 bus loads on a microgrid MG1 bus and a microgrid MG2 bus.
In the above process, if the micro-grid MG1 (micro-grid MG2) outputs power to the power distribution network and a load in the micro-grid MG1 (micro-grid MG2) is switched to the micro-grid MG2 (micro-grid MG1) when the current direction of the micro-grid MG2 (micro-grid MG1) is adjusted, when the current direction of the micro-grid MG1 (micro-grid MG2) is adjusted, under the condition that the current direction of the micro-grid MG2 (micro-grid MG1) is not changed and the output power of the distributed power supply DG2 (distributed power supply DG1) in the micro-grid MG2 (micro-grid MG1) is not changed, the load originally belonging to the micro-grid MG1 (micro-grid MG2) is preferentially switched to the micro-grid MG1 (micro-grid MG 367), then the bus load originally belonging to the micro-grid MG2 (micro-grid MG2) is switched to the micro-grid MG2 2 (micro-grid MG2), finally, the output power of distributed power supply DG1 (distributed power supply DG2) is reduced.
According to the method and the device in the embodiment of the invention, the operation information of the intelligent distribution network is analyzed in real time, the load distribution of the intelligent distribution network system and the output power of the distributed power supply are coordinated, the micro-grid containing the distributed power supply is ensured to be always connected into the intelligent distribution network in a load mode, the related faults can be processed by utilizing the traditional relay protection configuration scheme under the condition of the fault of the intelligent distribution network, the difficulty of fault processing of the intelligent distribution network containing the distributed power supply is reduced, the fault processing efficiency of the intelligent distribution network is improved, and the maximum utilization of the distributed power supply is realized.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A method for controlling the power flow of an intelligent power distribution network comprising a micro-grid is characterized by comprising the following steps:
1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time;
2) if the tide of one microgrid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, switching the load on a bus of the power distribution network to the microgrid until the tide direction at the node of the microgrid connected to the power distribution network is changed;
if the situation that the tide of a certain micro-grid flows to the power distribution network and a part of load originally belonging to the micro-grid is transferred to other micro-grids is judged, the load originally belonging to the micro-grid is preferentially switched from other micro-grids under the condition that the tide direction of other micro-grids connected to the power distribution network is not changed, and then the load on a bus of the power distribution network is switched;
if the load on the bus of the power distribution network is transferred to a certain microgrid, the tidal current direction of the microgrid still cannot be changed, and the loads in other microgrids are continuously switched to the microgrid under the conditions that the output power of distributed power supplies in all other microgrids is not changed and the tidal current directions of all other microgrid nodes connected to the power distribution network are not changed until the tidal current direction of the microgrid nodes connected to the power distribution network is changed;
the load on each microgrid bus is connected with the corresponding microgrid bus through a circuit breaker; the load on the distribution network bus is connected with the distribution network bus through a breaker; a circuit breaker is connected between each microgrid bus and each load on other microgrid buses and used for realizing the switching of the loads on each microgrid bus; and circuit breakers are connected between the micro-grid buses and loads on the power distribution network buses, and are used for switching the loads on the power distribution network buses and the micro-grid buses.
2. The intelligent power distribution network flow control method comprising the microgrid as claimed in claim 1, characterized in that if the flow direction of a certain microgrid connected to the power distribution network cannot be changed by transferring loads on buses of other microgrid, the output power of distributed power supplies in the microgrid is reduced until the flow direction of nodes of the microgrid connected to the power distribution network is changed.
3. The intelligent power distribution network power flow control device comprising the micro-grid is characterized in that the control device is used for realizing the following functions: 1) acquiring the output power of each distributed power supply and the tidal current direction of each microgrid connected to a node of a power distribution network in real time; 2) if the tide of one microgrid flows to the power distribution network, under the condition that the output power of all distributed power supplies is not changed, switching the load on a bus of the power distribution network to the microgrid until the tide direction at the node of the microgrid connected to the power distribution network is changed;
the control device is also used for realizing the following functions: if the situation that the tide of a certain micro-grid flows to the power distribution network and a part of load originally belonging to the micro-grid is transferred to other micro-grids is judged, the load originally belonging to the micro-grid is preferentially switched from other micro-grids under the condition that the tide direction of other micro-grids connected to the power distribution network is not changed, and then the load on a bus of the power distribution network is switched;
the control device is also used for realizing the following functions: if the load on the bus of the power distribution network is transferred to a certain microgrid, the tidal current direction of the microgrid still cannot be changed, and the loads in other microgrids are continuously switched to the microgrid under the conditions that the output power of distributed power supplies in other microgrids is not changed and the tidal current direction of other microgrid connected to the node of the power distribution network is not changed until the tidal current direction of the microgrid connected to the node of the power distribution network is changed;
the load on each microgrid bus is connected with the corresponding microgrid bus through a circuit breaker; the load on the distribution network bus is connected with the distribution network bus through a breaker; a circuit breaker is connected between each microgrid bus and each load on other microgrid buses and used for realizing the switching of the loads on each microgrid bus; and circuit breakers are connected between the micro-grid buses and loads on the power distribution network buses, and are used for switching the loads on the power distribution network buses and the micro-grid buses.
4. The intelligent power distribution network power flow control device with the micro-grid according to claim 3, wherein the control device is further configured to implement the following functions: if the tidal current direction of a certain microgrid accessing a power distribution network cannot be changed by transferring loads on buses of other microgrids, the output power of a distributed power supply in the microgrid is reduced until the tidal current direction of a node of the microgrid accessing the power distribution network is changed.
5. A fault handling method for an intelligent distribution network with a micro-grid, which is used for the intelligent distribution network adopting the micro-grid-containing intelligent distribution network power flow control method of claim 1 or 2, and comprises the following steps: when a fault occurs at a certain part of a power distribution network system outside a micro-grid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the micro-grid, the micro-grid is directly cut off, and the fault is processed according to a micro-grid island operation fault processing method.
6. A fault handling device for an intelligent distribution network with a micro-grid, which is used for the intelligent distribution network adopting the micro-grid-containing intelligent distribution network power flow control method of claim 1 or 2, and is used for realizing the following fault handling functions: when a fault occurs at a certain part of a power distribution network system outside a micro-grid, the fault is processed according to a traditional power distribution network relay protection configuration method, if the fault occurs inside the micro-grid, the micro-grid is directly cut off, and the fault is processed according to a micro-grid island operation fault processing method.
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| CN110932243B (en) * | 2019-11-22 | 2022-03-04 | 广东电网有限责任公司 | Double-end power supply line protection self-adaption method and system |
| CN111736007B (en) * | 2020-05-27 | 2022-10-11 | 湖南省湘电试验研究院有限公司 | High-resistance grounding-oriented line zero-sequence direction overcurrent protection method, system and medium |
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