CN110739694A - distribution network management and control method and system based on distribution area interconnection - Google Patents
distribution network management and control method and system based on distribution area interconnection 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
- 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
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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
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Abstract
The invention discloses an power distribution network control method based on power distribution network area interconnection, which comprises the steps of collecting data of each power distribution network area, analyzing the working state of each power distribution network area, responding to a plurality of low-load operation of the power distribution network area, sending a load concentration instruction, enabling loads of low-load operation platform areas to be interconnected to other non-low-load platform areas, responding to alternating current interconnection of the power distribution network areas and overload operation of a certain power distribution area, sending a load dispersion instruction, enabling loads of the overload power distribution network areas to be dispersed to the non-overload power distribution network areas, responding to direct current interconnection of the power distribution network areas and overload operation of a certain power distribution area, sending a load support instruction, transmitting active power flow to the PCS of the overload power distribution network areas, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload power distribution network areas.
Description
Technical Field
The invention relates to power distribution network management and control methods and systems based on power distribution station area interconnection, and belongs to the field of power distribution networks and power ubiquitous Internet of things.
Background
The distribution network adopts an alternating current distribution mode, and generally adopts a closed loop design and a split operation mode to carry out split power supply on each area. The existing power distribution network control method has the following problems: 1. when a certain area of a distribution network runs at a low load, the existing method cannot realize the alleviation of the load low-load distribution transformer; 2. when a certain area of a distribution network runs at a high load, the conventional method cannot realize the adjustment of the overload distribution transformer.
Disclosure of Invention
The invention provides distribution network management and control methods and systems based on distribution network area interconnection, which solve the problems of the existing distribution network management and control methods.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
distribution network management and control method based on distribution station interconnection comprises,
collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area;
responding to the low-load lines of the plurality of the station areas, and sending a load concentration instruction to interconnect the load of the low-load station area to other non-low-load station areas;
responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area;
and responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
And sending a load concentration instruction to the bus coupler switch of the adjacent alternating current bus of the low-load platform area, and performing synchronous closing on the bus coupler switch by using a synchronous detection function, so that the load of the low-load platform area is interconnected with the buses of other non-low-load platform areas, and a power supply loop of the low-load platform area is disconnected.
And sending a load dispersion instruction to the bus coupler switches of the adjacent alternating current buses of the overload transformer area, and performing synchronous switching on the bus coupler switches by using a synchronous detection function to ensure that the overload transformer area and the adjacent non-overload transformer area run in parallel to disperse the load.
And responding to the alternating current interconnection of the transformer areas and the overload operation of each transformer area, sending a load cutting instruction, and cutting off partial load of the overload transformer area according to the power utilization habit and the importance.
Sending load support instructions to other transformer areas, and utilizing other transformer areas PCS to transmit active power flow to an overload transformer area PCS; or, a load support instruction is sent to the direct current energy storage device, and the direct current energy storage device is used for transmitting active power flow to the overload station area PCS;
and sending a power constraint instruction to the overload transformer area, and limiting the active power flow of the PCS by using the PCS of the overload transformer area.
And responding to the fault of a certain area, determining the fault position and the fault type, and sending a fault processing instruction according to the fault position and the fault type to isolate the fault, quit the fault or support the fault.
In the fault support, the voltage-loss station PCS supplies power to the AC bus load of the station by adopting a VF control mode.
distribution network management and control system based on distribution station interconnection, comprising,
the acquisition and analysis module: collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area;
a load centralizing module: responding to the low-load lines of the plurality of the station areas, and sending a load concentration instruction to interconnect the load of the low-load station area to other non-low-load station areas;
a load dispersing module: responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area;
a load support module: and responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
computer readable storage media storing or more programs, the or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a power distribution grid management method based on power distribution grid interconnection.
a computing device comprising or more processors, memory, and or more programs, wherein or more programs are stored in the memory and configured to be executed by the or more processors, the or more programs comprising instructions for performing a power distribution grid management method based on power distribution grid interconnection.
The invention achieves the following beneficial effects: the invention realizes the release of the low-load distribution transformer through load concentration, realizes the regulation of the overload distribution transformer through load dispersion, load support or power constraint, and effectively improves the operation benefit of the power grid; meanwhile, the invention is not only suitable for an alternating current power distribution system, but also suitable for a direct current power distribution system and an alternating current and direct current series-parallel system.
Drawings
FIG. 1 is a flow chart of a method;
FIG. 2 is a typical AC interconnected power distribution system;
fig. 3 is a management and control functional diagram for an ac interconnection power distribution system;
FIG. 4 is a typical DC interconnect power distribution system;
fig. 5 is a control function diagram for the dc interconnection power distribution system.
Detailed Description
The invention is further described with reference to the accompanying drawings, the following examples are only for better clarity of the technical solution of the invention, and the protection scope of the invention is not limited thereby.
As shown in fig. 1, power distribution network management and control methods based on power distribution station interconnection can be arranged in a power distribution network centralized control device (power distribution network coordination controller), and specifically include the following steps:
step 1, collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area.
The method comprises the steps of monitoring data of each distribution area of a power distribution network through intelligent terminals such as a TTU (time to live) and the like, specifically comprising operation data, power grid states and the like, sending the data of each distribution area to a centralized control device of the power distribution network through communication systems such as a 4G communication system, a carrier communication system and the like, analyzing the data of each distribution area to obtain the working state of each distribution area, and carrying out deep terminal sensing on the power distribution network (for the distribution area, load information data belong to terminal data, and the deep terminal sensing refers to multi-state quantity sensing, calculation and analysis on data of terminal nodes such as loads, feeders and the like in the distribution area).
Step 2, sending out different control instructions according to different states and power distribution network types, which is as follows:
A. and responding to the low-load operation of the plurality of the transformer areas, and sending a load (alternating current and direct current loads under the transformer areas) centralized instruction to interconnect the low-load area loads to other non-low-load area.
The method comprises the steps of sending a load concentration instruction to a bus coupler switch of an adjacent alternating current bus of a low-load platform area, carrying out synchronous closing on the bus coupler switch by utilizing a synchronous detection function, enabling the load of the low-load platform area to be interconnected with buses of other non-low-load platform areas, and disconnecting a power supply loop of the low-load platform area, so that the low-load can be concentrated to 1 or more platform areas, and is concentrated to 1 platform area.
B. And responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area.
And sending a load dispersion instruction to the bus coupler switches of the adjacent alternating current buses of the overload transformer area, and performing synchronous switching on the bus coupler switches by using a synchronous detection function to ensure that the overload transformer area and the adjacent non-overload transformer area run in parallel, thereby realizing load dispersion based on impedance-voltage natural distribution and dispersing the load of the overload transformer area to 2 or more transformer areas for power supply.
C. Responding to the alternating current interconnection of the transformer areas and the overload operation of each transformer area, sending a load cutting instruction, and cutting off partial load of the overload transformer area according to the power utilization habit and the importance; in the load shedding process, the priority shedding is lower in importance, and users who do not have power usage habits in the period of time preferentially shed.
D. And responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
Sending load support instructions to other transformer areas, and utilizing other transformer areas PCS to transmit active power flow to an overload transformer area PCS; or, a load support instruction is sent to the direct current energy storage device, and the direct current energy storage device is used for transmitting active power flow to the overload station area PCS.
And sending a power constraint instruction to the overload transformer area, and limiting the active power flow of the PCS by using the PCS of the overload transformer area.
E. And responding to the fault of a certain area, determining the fault position and the fault type, and sending a fault processing instruction according to the fault position and the fault type to isolate the fault, quit the fault or support the fault.
The fault support is as follows: a voltage loss distribution area PCS adopts a VF control mode to supply power to an alternating current bus load of the distribution area; the fault isolation is as follows: the fault area is cut off and isolated from the distribution network system, so that fault linkage or fault expansion is avoided; and (4) exiting the fault: and when the power distribution system has serious faults, executing system fault exit.
As shown in figures 2 and 3, a typical alternating current interconnection power distribution station topological graph is formed, and a plurality of stations are in alternating current interconnection through a bus coupler switch, wherein the management and control method comprises the steps of (1) detecting the state of each station through intelligent terminals such as TTU (time to live) and carrying out deep end perception on a power distribution network when a system is in a stable state, (2) sending a load concentration instruction when detecting low load of the plurality of stations, concentrating the loads of the plurality of stations into a single station through the bus coupler switch, cutting off redundant power supply and improving the operation efficiency of the system, (3) when detecting overload of a certain station, reducing the load rate and maintaining the stable operation of the system through control means such as detection synchronization and the like by utilizing the alternating current bus coupler switch, carrying out fault isolation control on the alternating current load dispersion of the plurality of stations, balancing the load rate of each station, (4) when detecting the overload of the load rate of each station, reducing the load rate and maintaining the stable operation of the system, and (5) when detecting the fault of a certain station, releasing the bus coupler relation with the interconnected station to carry out fault isolation control and guarantee the operation of each interconnected station.
As shown in fig. 4 and 5, a typical dc interconnection distribution substation topological diagram, in which a plurality of substations are dc interconnected through a PCS, is suitable for a management and control method of a dc system, which specifically includes load concentration, load support, power constraint, fault support, fault isolation, fault exit, and the like, where the load concentration, fault isolation, and fault exit are similar to those of an ac system and are not repeated, and the management and control method further includes (1) load support, which uses other substations PCS to deliver active power to an overloaded substation PCS or enables a dc energy storage device to support, and controls energy storage output power and total energy according to a current load rate, and maintains a system load rate level, (2) when a certain substation is detected to be lightly overloaded (the load does not exceed 110% of a rated capacity), a power constraint can be used, i.e., an upper limit of output power is set, and (3) when a certain substation is detected to be under-voltage, i.e., the ac power supply voltage of the substation is not within a rated range, a fault support is performed, and the load supply to the fault substation is supported.
The method realizes the release of the low-load distribution transformer through load concentration, realizes the regulation of the overload distribution transformer through load dispersion, load support or power constraint, and effectively improves the operation benefit of the power grid; meanwhile, the method is not only suitable for an alternating current power distribution system, but also suitable for a direct current power distribution system and an alternating current and direct current series-parallel system.
distribution network management and control system based on distribution station interconnection, comprising,
the acquisition and analysis module: collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area;
a load centralizing module: responding to the low-load lines of the plurality of the station areas, and sending a load concentration instruction to interconnect the load of the low-load station area to other non-low-load station areas;
a load dispersing module: responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area;
a load support module: and responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
computer readable storage media storing or more programs, the or more programs comprising instructions, which when executed by a computing device, cause the computing device to control a method based on a power distribution grid management of power distribution grid area interconnections.
a computing device comprising or more processors, memory, and or more programs, wherein or more programs are stored in the memory and configured to be executed by the or more processors, the or more programs comprising instructions for performing a power distribution grid management method based on power distribution grid interconnection.
Moreover, the present application may take the form of a computer program product embodied on or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
It is to be understood that each flow and/or block in 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 which can 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 flow diagram 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 present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1, distribution network management and control method based on distribution network interconnection, which is characterized by comprising the following steps,
collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area;
responding to the low-load lines of the plurality of the station areas, and sending a load concentration instruction to interconnect the load of the low-load station area to other non-low-load station areas;
responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area;
and responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
2. The power distribution network management and control method based on power distribution grid interconnection according to claim 1, wherein a load concentration instruction is sent to a bus coupler switch of an adjacent alternating current bus of the low-load grid area, and the bus coupler switch is synchronously switched on by utilizing a synchronous detection function, so that the load of the low-load grid area is interconnected with buses of other non-low-load grid areas, and a power supply loop of the low-load grid area is disconnected.
3. The distribution network management and control methods based on distribution substation interconnection, according to claim 1, wherein a load distribution instruction is sent to a bus coupler switch of an adjacent alternating current bus of an overload substation, and a synchronous switch-on is performed on the bus coupler switch by using a synchronous detection function, so that the overload substation and an adjacent non-overload substation operate in parallel to distribute loads.
4. The distribution network management and control method based on distribution network interconnection according to claim 1, wherein in response to network interconnection and overload operation of each network, a load shedding instruction is sent, and partial load of an overloaded network is shed according to power utilization habits and importance.
5. The distribution network management and control method based on distribution network interconnection of claim 1, wherein the method comprises the steps of sending load support instructions to other network areas, and utilizing other network areas PCS to transmit active power flow to an overload network area PCS, or sending load support instructions to a direct current energy storage device, and utilizing the direct current energy storage device to transmit active power flow to the overload network area PCS;
and sending a power constraint instruction to the overload transformer area, and limiting the active power flow of the PCS by using the PCS of the overload transformer area.
6. The distribution network management and control method based on distribution substation interconnection according to claim 1, wherein in response to a fault in a certain substation, a fault location and a fault type are determined, and according to the fault location and the fault type, a fault handling instruction is issued to isolate the fault, quit the fault or support the fault.
7. The distribution network management and control method based on distribution substation interconnection of claim 6, wherein fault support is that the PCS of the voltage-loss substation adopts VF control mode to supply power to the AC bus load of the substation.
8, distribution network management and control system based on distribution station interconnection, which is characterized by comprising,
the acquisition and analysis module: collecting data of each distribution area of the power distribution network, and analyzing the working state of each distribution area;
a load centralizing module: responding to the low-load lines of the plurality of the station areas, and sending a load concentration instruction to interconnect the load of the low-load station area to other non-low-load station areas;
a load dispersing module: responding to the exchange interconnection of the transformer areas and the overload operation of a certain transformer area, and sending a load dispersion instruction to disperse the load of the overload transformer area to the non-overload transformer area;
a load support module: and responding to the direct current interconnection of the transformer areas and the overload operation of a certain transformer area, sending a load support instruction, transmitting active power flow to the PCS of the overload transformer area, or sending a power constraint instruction, and limiting the active power flow of the PCS of the overload transformer area.
9, a computer readable storage medium storing one or more programs, wherein the or more programs include instructions which, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-7 of .
10, , comprising,
, memory, and or more programs, wherein or more programs are stored in the memory and configured to be executed by the or more processors, the or more programs including instructions for performing any of the methods of claims 1-7.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112084713A (en) * | 2020-09-09 | 2020-12-15 | 国网江苏省电力有限公司南通供电分公司 | Single-power radial distribution network load switch state identification method |
| CN112713597A (en) * | 2020-12-11 | 2021-04-27 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Device and method for coordinating and controlling power distribution of two low-voltage transformer areas |
| CN113098005A (en) * | 2021-04-09 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Orderly power utilization monitoring method and device and distribution transformer side monitoring equipment |
| CN113452027A (en) * | 2021-07-27 | 2021-09-28 | 山东鲁软数字科技有限公司智慧能源分公司 | Energy scheduling system and method for low-voltage flexible direct power distribution transformer area |
| CN113991665A (en) * | 2020-12-11 | 2022-01-28 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Coordination device and method for power supply systems of two low-voltage transformer areas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112084713A (en) * | 2020-09-09 | 2020-12-15 | 国网江苏省电力有限公司南通供电分公司 | Single-power radial distribution network load switch state identification method |
| CN112084713B (en) * | 2020-09-09 | 2022-07-01 | 国网江苏省电力有限公司南通供电分公司 | Single-power radial distribution network load switch state identification method |
| CN112713597A (en) * | 2020-12-11 | 2021-04-27 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Device and method for coordinating and controlling power distribution of two low-voltage transformer areas |
| CN113991665A (en) * | 2020-12-11 | 2022-01-28 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Coordination device and method for power supply systems of two low-voltage transformer areas |
| CN113098005A (en) * | 2021-04-09 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Orderly power utilization monitoring method and device and distribution transformer side monitoring equipment |
| CN113098005B (en) * | 2021-04-09 | 2022-07-01 | 广东电网有限责任公司广州供电局 | Orderly power utilization monitoring method and device and distribution side monitoring equipment |
| CN113452027A (en) * | 2021-07-27 | 2021-09-28 | 山东鲁软数字科技有限公司智慧能源分公司 | Energy scheduling system and method for low-voltage flexible direct power distribution transformer area |
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Application publication date: 20200131 |